JUCE/modules/juce_gui_basics/menus/juce_PopupMenu.cpp

/*
  ==============================================================================

   This file is part of the JUCE 7 technical preview.
   Copyright (c) 2022 - Raw Material Software Limited

   You may use this code under the terms of the GPL v3
   (see www.gnu.org/licenses).

   For the technical preview this file cannot be licensed commercially.

   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
   DISCLAIMED.

  ==============================================================================
*/

namespace juce
{

namespace PopupMenuSettings
{
    const int scrollZone = 24;
    const int dismissCommandId = 0x6287345f;

    static bool menuWasHiddenBecauseOfAppChange = false;
}

//==============================================================================
struct PopupMenu::HelperClasses
{

class MouseSourceState;
struct MenuWindow;

static bool canBeTriggered (const PopupMenu::Item& item) noexcept
{
    return item.isEnabled
        && item.itemID != 0
        && ! item.isSectionHeader
        && (item.customComponent == nullptr || item.customComponent->isTriggeredAutomatically());
}

static bool hasActiveSubMenu (const PopupMenu::Item& item) noexcept
{
    return item.isEnabled
        && item.subMenu != nullptr
        && item.subMenu->items.size() > 0;
}

//==============================================================================
struct HeaderItemComponent  : public PopupMenu::CustomComponent
{
    HeaderItemComponent (const String& name, const Options& opts)
        : CustomComponent (false), options (opts)
    {
        setName (name);
    }

    void paint (Graphics& g) override
    {
        getLookAndFeel().drawPopupMenuSectionHeaderWithOptions (g,
                                                                getLocalBounds(),
                                                                getName(),
                                                                options);
    }

    void getIdealSize (int& idealWidth, int& idealHeight) override
    {
        getLookAndFeel().getIdealPopupMenuItemSizeWithOptions (getName(),
                                                               false,
                                                               -1,
                                                               idealWidth,
                                                               idealHeight,
                                                               options);
        idealHeight += idealHeight / 2;
        idealWidth += idealWidth / 4;
    }

    std::unique_ptr<AccessibilityHandler> createAccessibilityHandler() override
    {
        return nullptr;
    }

    const Options& options;

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (HeaderItemComponent)
};

//==============================================================================
struct ItemComponent  : public Component
{
    ItemComponent (const PopupMenu::Item& i, const PopupMenu::Options& o, MenuWindow& parent)
        : item (i), parentWindow (parent), options (o), customComp (i.customComponent)
    {
        if (item.isSectionHeader)
            customComp = *new HeaderItemComponent (item.text, options);

        if (customComp != nullptr)
        {
            setItem (*customComp, &item);
            addAndMakeVisible (*customComp);
        }

        parent.addAndMakeVisible (this);

        updateShortcutKeyDescription();

        int itemW = 80;
        int itemH = 16;
        getIdealSize (itemW, itemH, options.getStandardItemHeight());
        setSize (itemW, jlimit (1, 600, itemH));

        addMouseListener (&parent, false);
    }

    ~ItemComponent() override
    {
        if (customComp != nullptr)
            setItem (*customComp, nullptr);

        removeChildComponent (customComp.get());
    }

    void getIdealSize (int& idealWidth, int& idealHeight, const int standardItemHeight)
    {
        if (customComp != nullptr)
            customComp->getIdealSize (idealWidth, idealHeight);
        else
            getLookAndFeel().getIdealPopupMenuItemSizeWithOptions (getTextForMeasurement(),
                                                                   item.isSeparator,
                                                                   standardItemHeight,
                                                                   idealWidth, idealHeight,
                                                                   options);
    }

    void paint (Graphics& g) override
    {
        if (customComp == nullptr)
            getLookAndFeel().drawPopupMenuItemWithOptions (g, getLocalBounds(),
                                                           isHighlighted,
                                                           item,
                                                           options);
    }

    void resized() override
    {
        if (auto* child = getChildComponent (0))
        {
            const auto border = getLookAndFeel().getPopupMenuBorderSizeWithOptions (options);
            child->setBounds (getLocalBounds().reduced (border, 0));
        }
    }

    void setHighlighted (bool shouldBeHighlighted)
    {
        shouldBeHighlighted = shouldBeHighlighted && item.isEnabled;

        if (isHighlighted != shouldBeHighlighted)
        {
            isHighlighted = shouldBeHighlighted;

            if (customComp != nullptr)
                customComp->setHighlighted (shouldBeHighlighted);

            if (isHighlighted)
                if (auto* handler = getAccessibilityHandler())
                    handler->grabFocus();

            repaint();
        }
    }

    static bool isAccessibilityHandlerRequired (const PopupMenu::Item& item)
    {
        return item.isSectionHeader || hasActiveSubMenu (item) || canBeTriggered (item);
    }

    PopupMenu::Item item;

private:
    //==============================================================================
    class ItemAccessibilityHandler  : public AccessibilityHandler
    {
    public:
        explicit ItemAccessibilityHandler (ItemComponent& itemComponentToWrap)
            : AccessibilityHandler (itemComponentToWrap,
                                    isAccessibilityHandlerRequired (itemComponentToWrap.item) ? AccessibilityRole::menuItem
                                                                                              : AccessibilityRole::ignored,
                                    getAccessibilityActions (*this, itemComponentToWrap)),
              itemComponent (itemComponentToWrap)
        {
        }

        String getTitle() const override
        {
            return itemComponent.item.text;
        }

        AccessibleState getCurrentState() const override
        {
            auto state = AccessibilityHandler::getCurrentState().withSelectable()
                                                                .withAccessibleOffscreen();

            if (hasActiveSubMenu (itemComponent.item))
            {
                state = itemComponent.parentWindow.isSubMenuVisible() ? state.withExpandable().withExpanded()
                                                                      : state.withExpandable().withCollapsed();
            }

            if (itemComponent.item.isTicked)
                state = state.withCheckable().withChecked();

            return state.isFocused() ? state.withSelected() : state;
        }

    private:
        static AccessibilityActions getAccessibilityActions (ItemAccessibilityHandler& handler,
                                                             ItemComponent& item)
        {
            auto onFocus = [&item]
            {
                item.parentWindow.disableTimerUntilMouseMoves();
                item.parentWindow.ensureItemComponentIsVisible (item, -1);
                item.parentWindow.setCurrentlyHighlightedChild (&item);
            };

            auto onToggle = [&handler, &item, onFocus]
            {
                if (handler.getCurrentState().isSelected())
                    item.parentWindow.setCurrentlyHighlightedChild (nullptr);
                else
                    onFocus();
            };

            auto actions = AccessibilityActions().addAction (AccessibilityActionType::focus,  std::move (onFocus))
                                                 .addAction (AccessibilityActionType::toggle, std::move (onToggle));

            if (canBeTriggered (item.item))
            {
                actions.addAction (AccessibilityActionType::press, [&item]
                {
                    item.parentWindow.setCurrentlyHighlightedChild (&item);
                    item.parentWindow.triggerCurrentlyHighlightedItem();
                });
            }

            if (hasActiveSubMenu (item.item))
            {
                auto showSubMenu = [&item]
                {
                    item.parentWindow.showSubMenuFor (&item);

                    if (auto* subMenu = item.parentWindow.activeSubMenu.get())
                        subMenu->setCurrentlyHighlightedChild (subMenu->items.getFirst());
                };

                actions.addAction (AccessibilityActionType::press,    showSubMenu);
                actions.addAction (AccessibilityActionType::showMenu, showSubMenu);
            }

            return actions;
        }

        ItemComponent& itemComponent;
    };

    std::unique_ptr<AccessibilityHandler> createAccessibilityHandler() override
    {
        return item.isSeparator ? nullptr : std::make_unique<ItemAccessibilityHandler> (*this);
    }

    //==============================================================================
    MenuWindow& parentWindow;
    const PopupMenu::Options& options;
    // NB: we use a copy of the one from the item info in case we're using our own section comp
    ReferenceCountedObjectPtr<CustomComponent> customComp;
    bool isHighlighted = false;

    void updateShortcutKeyDescription()
    {
        if (item.commandManager != nullptr
             && item.itemID != 0
             && item.shortcutKeyDescription.isEmpty())
        {
            String shortcutKey;

            for (auto& keypress : item.commandManager->getKeyMappings()
                                    ->getKeyPressesAssignedToCommand (item.itemID))
            {
                auto key = keypress.getTextDescriptionWithIcons();

                if (shortcutKey.isNotEmpty())
                    shortcutKey << ", ";

                if (key.length() == 1 && key[0] < 128)
                    shortcutKey << "shortcut: '" << key << '\'';
                else
                    shortcutKey << key;
            }

            item.shortcutKeyDescription = shortcutKey.trim();
        }
    }

    String getTextForMeasurement() const
    {
        return item.shortcutKeyDescription.isNotEmpty() ? item.text + "   " + item.shortcutKeyDescription
                                                        : item.text;
    }

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (ItemComponent)
};

//==============================================================================
struct MenuWindow  : public Component
{
    MenuWindow (const PopupMenu& menu, MenuWindow* parentWindow,
                Options opts, bool alignToRectangle, bool shouldDismissOnMouseUp,
                ApplicationCommandManager** manager, float parentScaleFactor = 1.0f)
        : Component ("menu"),
          parent (parentWindow),
          options (opts.withParentComponent (getLookAndFeel().getParentComponentForMenuOptions (opts))),
          managerOfChosenCommand (manager),
          componentAttachedTo (options.getTargetComponent()),
          dismissOnMouseUp (shouldDismissOnMouseUp),
          windowCreationTime (Time::getMillisecondCounter()),
          lastFocusedTime (windowCreationTime),
          timeEnteredCurrentChildComp (windowCreationTime),
          scaleFactor (parentWindow != nullptr ? parentScaleFactor : 1.0f)
    {
        setWantsKeyboardFocus (false);
        setMouseClickGrabsKeyboardFocus (false);
        setAlwaysOnTop (true);
        setFocusContainerType (FocusContainerType::focusContainer);

        setLookAndFeel (parent != nullptr ? &(parent->getLookAndFeel())
                                          : menu.lookAndFeel.get());

        auto& lf = getLookAndFeel();

        if (auto* pc = options.getParentComponent())
        {
            pc->addChildComponent (this);
        }
        else
        {
            const auto shouldDisableAccessibility = [this]
            {
                const auto* compToCheck = parent != nullptr ? parent
                                                            : options.getTargetComponent();

                return compToCheck != nullptr && ! compToCheck->isAccessible();
            }();

            if (shouldDisableAccessibility)
                setAccessible (false);

            addToDesktop (ComponentPeer::windowIsTemporary
                          | ComponentPeer::windowIgnoresKeyPresses
                          | lf.getMenuWindowFlags());

            Desktop::getInstance().addGlobalMouseListener (this);
        }

        if (options.getParentComponent() == nullptr && parentWindow == nullptr && lf.shouldPopupMenuScaleWithTargetComponent (options))
            if (auto* targetComponent = options.getTargetComponent())
                scaleFactor = Component::getApproximateScaleFactorForComponent (targetComponent);

        setOpaque (lf.findColour (PopupMenu::backgroundColourId).isOpaque()
                     || ! Desktop::canUseSemiTransparentWindows());

        const auto initialSelectedId = options.getInitiallySelectedItemId();

        for (int i = 0; i < menu.items.size(); ++i)
        {
            auto& item = menu.items.getReference (i);

            if (i + 1 < menu.items.size() || ! item.isSeparator)
            {
                auto* child = items.add (new ItemComponent (item, options, *this));

                if (initialSelectedId != 0 && item.itemID == initialSelectedId)
                    setCurrentlyHighlightedChild (child);
            }
        }

        auto targetArea = options.getTargetScreenArea() / scaleFactor;

        calculateWindowPos (targetArea, alignToRectangle);
        setTopLeftPosition (windowPos.getPosition());

        if (auto visibleID = options.getItemThatMustBeVisible())
        {
            for (auto* item : items)
            {
                if (item->item.itemID == visibleID)
                {
                    const auto targetPosition = [&]
                    {
                        if (auto* pc = options.getParentComponent())
                            return pc->getLocalPoint (nullptr, targetArea.getTopLeft());

                        return targetArea.getTopLeft();
                    }();

                    auto y = targetPosition.getY() - windowPos.getY();
                    ensureItemComponentIsVisible (*item, isPositiveAndBelow (y, windowPos.getHeight()) ? y : -1);

                    break;
                }
            }
        }

        resizeToBestWindowPos();

        getActiveWindows().add (this);
        lf.preparePopupMenuWindow (*this);

        getMouseState (Desktop::getInstance().getMainMouseSource()); // forces creation of a mouse source watcher for the main mouse
    }

    ~MenuWindow() override
    {
        getActiveWindows().removeFirstMatchingValue (this);
        Desktop::getInstance().removeGlobalMouseListener (this);
        activeSubMenu.reset();
        items.clear();
    }

    //==============================================================================
    void paint (Graphics& g) override
    {
        if (isOpaque())
            g.fillAll (Colours::white);

        auto& theme = getLookAndFeel();
        theme.drawPopupMenuBackgroundWithOptions (g, getWidth(), getHeight(), options);

        if (columnWidths.isEmpty())
            return;

        const auto separatorWidth = theme.getPopupMenuColumnSeparatorWidthWithOptions (options);
        const auto border = theme.getPopupMenuBorderSizeWithOptions (options);

        auto currentX = 0;

        std::for_each (columnWidths.begin(), std::prev (columnWidths.end()), [&] (int width)
        {
            const Rectangle<int> separator (currentX + width,
                                            border,
                                            separatorWidth,
                                            getHeight() - border * 2);
            theme.drawPopupMenuColumnSeparatorWithOptions (g, separator, options);
            currentX += width + separatorWidth;
        });
    }

    void paintOverChildren (Graphics& g) override
    {
        auto& lf = getLookAndFeel();

        if (options.getParentComponent())
            lf.drawResizableFrame (g, getWidth(), getHeight(),
                                   BorderSize<int> (getLookAndFeel().getPopupMenuBorderSizeWithOptions (options)));

        if (canScroll())
        {
            if (isTopScrollZoneActive())
            {
                lf.drawPopupMenuUpDownArrowWithOptions (g,
                                                        getWidth(),
                                                        PopupMenuSettings::scrollZone,
                                                        true,
                                                        options);
            }

            if (isBottomScrollZoneActive())
            {
                g.setOrigin (0, getHeight() - PopupMenuSettings::scrollZone);
                lf.drawPopupMenuUpDownArrowWithOptions (g,
                                                        getWidth(),
                                                        PopupMenuSettings::scrollZone,
                                                        false,
                                                        options);
            }
        }
    }

    //==============================================================================
    // hide this and all sub-comps
    void hide (const PopupMenu::Item* item, bool makeInvisible)
    {
        if (isVisible())
        {
            WeakReference<Component> deletionChecker (this);

            activeSubMenu.reset();
            currentChild = nullptr;

            if (item != nullptr
                 && item->commandManager != nullptr
                 && item->itemID != 0)
            {
                *managerOfChosenCommand = item->commandManager;
            }

            auto resultID = options.hasWatchedComponentBeenDeleted() ? 0 : getResultItemID (item);

            exitModalState (resultID);
            exitingModalState = true;

            if (makeInvisible && deletionChecker != nullptr)
                setVisible (false);

            if (resultID != 0
                 && item != nullptr
                 && item->action != nullptr)
                MessageManager::callAsync (item->action);
        }
    }

    static int getResultItemID (const PopupMenu::Item* item)
    {
        if (item == nullptr)
            return 0;

        if (auto* cc = item->customCallback.get())
            if (! cc->menuItemTriggered())
                return 0;

        return item->itemID;
    }

    void dismissMenu (const PopupMenu::Item* item)
    {
        if (parent != nullptr)
        {
            parent->dismissMenu (item);
        }
        else
        {
            if (item != nullptr)
            {
                // need a copy of this on the stack as the one passed in will get deleted during this call
                auto mi (*item);
                hide (&mi, false);
            }
            else
            {
                hide (nullptr, true);
            }
        }
    }

    float getDesktopScaleFactor() const override    { return scaleFactor * Desktop::getInstance().getGlobalScaleFactor(); }

    void visibilityChanged() override
    {
        if (! isShowing())
            return;

        auto* accessibleFocus = [this]
        {
          if (currentChild != nullptr)
              if (auto* childHandler = currentChild->getAccessibilityHandler())
                  return childHandler;

            return getAccessibilityHandler();
        }();

        if (accessibleFocus != nullptr)
            accessibleFocus->grabFocus();
    }

    //==============================================================================
    bool keyPressed (const KeyPress& key) override
    {
        if (key.isKeyCode (KeyPress::downKey))
        {
            selectNextItem (MenuSelectionDirection::forwards);
        }
        else if (key.isKeyCode (KeyPress::upKey))
        {
            selectNextItem (MenuSelectionDirection::backwards);
        }
        else if (key.isKeyCode (KeyPress::leftKey))
        {
            if (parent != nullptr)
            {
                Component::SafePointer<MenuWindow> parentWindow (parent);
                ItemComponent* currentChildOfParent = parentWindow->currentChild;

                hide (nullptr, true);

                if (parentWindow != nullptr)
                    parentWindow->setCurrentlyHighlightedChild (currentChildOfParent);

                disableTimerUntilMouseMoves();
            }
            else if (componentAttachedTo != nullptr)
            {
                componentAttachedTo->keyPressed (key);
            }
        }
        else if (key.isKeyCode (KeyPress::rightKey))
        {
            disableTimerUntilMouseMoves();

            if (showSubMenuFor (currentChild))
            {
                if (isSubMenuVisible())
                    activeSubMenu->selectNextItem (MenuSelectionDirection::current);
            }
            else if (componentAttachedTo != nullptr)
            {
                componentAttachedTo->keyPressed (key);
            }
        }
        else if (key.isKeyCode (KeyPress::returnKey) || key.isKeyCode (KeyPress::spaceKey))
        {
            triggerCurrentlyHighlightedItem();
        }
        else if (key.isKeyCode (KeyPress::escapeKey))
        {
            dismissMenu (nullptr);
        }
        else
        {
            return false;
        }

        return true;
    }

    void inputAttemptWhenModal() override
    {
        WeakReference<Component> deletionChecker (this);

        for (auto* ms : mouseSourceStates)
        {
            ms->timerCallback();

            if (deletionChecker == nullptr)
                return;
        }

        if (! isOverAnyMenu())
        {
            if (componentAttachedTo != nullptr)
            {
                // we want to dismiss the menu, but if we do it synchronously, then
                // the mouse-click will be allowed to pass through. That's good, except
                // when the user clicks on the button that originally popped the menu up,
                // as they'll expect the menu to go away, and in fact it'll just
                // come back. So only dismiss synchronously if they're not on the original
                // comp that we're attached to.
                auto mousePos = componentAttachedTo->getMouseXYRelative();

                if (componentAttachedTo->reallyContains (mousePos, true))
                {
                    postCommandMessage (PopupMenuSettings::dismissCommandId); // dismiss asynchronously
                    return;
                }
            }

            dismissMenu (nullptr);
        }
    }

    void handleCommandMessage (int commandId) override
    {
        Component::handleCommandMessage (commandId);

        if (commandId == PopupMenuSettings::dismissCommandId)
            dismissMenu (nullptr);
    }

    //==============================================================================
    void mouseMove  (const MouseEvent& e) override    { handleMouseEvent (e); }
    void mouseDown  (const MouseEvent& e) override    { handleMouseEvent (e); }
    void mouseDrag  (const MouseEvent& e) override    { handleMouseEvent (e); }
    void mouseUp    (const MouseEvent& e) override    { handleMouseEvent (e); }

    void mouseWheelMove (const MouseEvent&, const MouseWheelDetails& wheel) override
    {
        alterChildYPos (roundToInt (-10.0f * wheel.deltaY * PopupMenuSettings::scrollZone));
    }

    void handleMouseEvent (const MouseEvent& e)
    {
        getMouseState (e.source).handleMouseEvent (e);
    }

    bool windowIsStillValid()
    {
        if (! isVisible())
            return false;

        if (componentAttachedTo != options.getTargetComponent())
        {
            dismissMenu (nullptr);
            return false;
        }

        if (auto* currentlyModalWindow = dynamic_cast<MenuWindow*> (Component::getCurrentlyModalComponent()))
            if (! treeContains (currentlyModalWindow))
                return false;

        if (exitingModalState)
            return false;

        return true;
    }

    static Array<MenuWindow*>& getActiveWindows()
    {
        static Array<MenuWindow*> activeMenuWindows;
        return activeMenuWindows;
    }

    MouseSourceState& getMouseState (MouseInputSource source)
    {
        MouseSourceState* mouseState = nullptr;

        for (auto* ms : mouseSourceStates)
        {
            if      (ms->source == source)                        mouseState = ms;
            else if (ms->source.getType() != source.getType())    ms->stopTimer();
        }

        if (mouseState == nullptr)
        {
            mouseState = new MouseSourceState (*this, source);
            mouseSourceStates.add (mouseState);
        }

        return *mouseState;
    }

    //==============================================================================
    bool isOverAnyMenu() const
    {
        return parent != nullptr ? parent->isOverAnyMenu()
                                 : isOverChildren();
    }

    bool isOverChildren() const
    {
        return isVisible()
                && (isAnyMouseOver() || (activeSubMenu != nullptr && activeSubMenu->isOverChildren()));
    }

    bool isAnyMouseOver() const
    {
        for (auto* ms : mouseSourceStates)
            if (ms->isOver())
                return true;

        return false;
    }

    bool treeContains (const MenuWindow* const window) const noexcept
    {
        auto* mw = this;

        while (mw->parent != nullptr)
            mw = mw->parent;

        while (mw != nullptr)
        {
            if (mw == window)
                return true;

            mw = mw->activeSubMenu.get();
        }

        return false;
    }

    bool doesAnyJuceCompHaveFocus()
    {
        if (! isForegroundOrEmbeddedProcess (componentAttachedTo))
            return false;

        if (Component::getCurrentlyFocusedComponent() != nullptr)
            return true;

        for (int i = ComponentPeer::getNumPeers(); --i >= 0;)
        {
            if (ComponentPeer::getPeer (i)->isFocused())
            {
                hasAnyJuceCompHadFocus = true;
                return true;
            }
        }

        return ! hasAnyJuceCompHadFocus;
    }

    //==============================================================================
    Rectangle<int> getParentArea (Point<int> targetPoint, Component* relativeTo = nullptr)
    {
        if (relativeTo != nullptr)
            targetPoint = relativeTo->localPointToGlobal (targetPoint);

        auto* display = Desktop::getInstance().getDisplays().getDisplayForPoint (targetPoint * scaleFactor);
        auto parentArea = display->safeAreaInsets.subtractedFrom (display->totalArea);

        if (auto* pc = options.getParentComponent())
        {
            return pc->getLocalArea (nullptr,
                                     pc->getScreenBounds()
                                           .reduced (getLookAndFeel().getPopupMenuBorderSizeWithOptions (options))
                                           .getIntersection (parentArea));
        }

        return parentArea;
    }

    void calculateWindowPos (Rectangle<int> target, const bool alignToRectangle)
    {
        auto parentArea = getParentArea (target.getCentre()) / scaleFactor;

        if (auto* pc = options.getParentComponent())
            target = pc->getLocalArea (nullptr, target).getIntersection (parentArea);

        auto maxMenuHeight = parentArea.getHeight() - 24;

        int x, y, widthToUse, heightToUse;
        layoutMenuItems (parentArea.getWidth() - 24, maxMenuHeight, widthToUse, heightToUse);

        if (alignToRectangle)
        {
            x = target.getX();

            auto spaceUnder = parentArea.getBottom() - target.getBottom();
            auto spaceOver = target.getY() - parentArea.getY();
            auto bufferHeight = 30;

            if (options.getPreferredPopupDirection() == Options::PopupDirection::upwards)
                y = (heightToUse < spaceOver - bufferHeight  || spaceOver >= spaceUnder) ? target.getY() - heightToUse
                                                                                         : target.getBottom();
            else
                y = (heightToUse < spaceUnder - bufferHeight || spaceUnder >= spaceOver) ? target.getBottom()
                                                                                         : target.getY() - heightToUse;
        }
        else
        {
            bool tendTowardsRight = target.getCentreX() < parentArea.getCentreX();

            if (parent != nullptr)
            {
                if (parent->parent != nullptr)
                {
                    const bool parentGoingRight = (parent->getX() + parent->getWidth() / 2
                                                    > parent->parent->getX() + parent->parent->getWidth() / 2);

                    if (parentGoingRight && target.getRight() + widthToUse < parentArea.getRight() - 4)
                        tendTowardsRight = true;
                    else if ((! parentGoingRight) && target.getX() > widthToUse + 4)
                        tendTowardsRight = false;
                }
                else if (target.getRight() + widthToUse < parentArea.getRight() - 32)
                {
                    tendTowardsRight = true;
                }
            }

            auto biggestSpace = jmax (parentArea.getRight() - target.getRight(),
                                      target.getX() - parentArea.getX()) - 32;

            if (biggestSpace < widthToUse)
            {
                layoutMenuItems (biggestSpace + target.getWidth() / 3, maxMenuHeight, widthToUse, heightToUse);

                if (numColumns > 1)
                    layoutMenuItems (biggestSpace - 4, maxMenuHeight, widthToUse, heightToUse);

                tendTowardsRight = (parentArea.getRight() - target.getRight()) >= (target.getX() - parentArea.getX());
            }

            x = tendTowardsRight ? jmin (parentArea.getRight() - widthToUse - 4, target.getRight())
                                 : jmax (parentArea.getX() + 4, target.getX() - widthToUse);

            if (getLookAndFeel().getPopupMenuBorderSizeWithOptions (options) == 0) // workaround for dismissing the window on mouse up when border size is 0
                x += tendTowardsRight ? 1 : -1;

            const auto border = getLookAndFeel().getPopupMenuBorderSizeWithOptions (options);
            y = target.getCentreY() > parentArea.getCentreY() ? jmax (parentArea.getY(), target.getBottom() - heightToUse) + border
                                                              : target.getY() - border;
        }

        x = jmax (parentArea.getX() + 1, jmin (parentArea.getRight()  - (widthToUse  + 6), x));
        y = jmax (parentArea.getY() + 1, jmin (parentArea.getBottom() - (heightToUse + 6), y));

        windowPos.setBounds (x, y, widthToUse, heightToUse);

        // sets this flag if it's big enough to obscure any of its parent menus
        hideOnExit = parent != nullptr
                      && parent->windowPos.intersects (windowPos.expanded (-4, -4));
    }

    void layoutMenuItems (const int maxMenuW, const int maxMenuH, int& width, int& height)
    {
        // Ensure we don't try to add an empty column after the final item
        if (auto* last = items.getLast())
            last->item.shouldBreakAfter = false;

        const auto isBreak = [] (const ItemComponent* item) { return item->item.shouldBreakAfter; };
        const auto numBreaks = static_cast<int> (std::count_if (items.begin(), items.end(), isBreak));
        numColumns = numBreaks + 1;

        if (numBreaks == 0)
            insertColumnBreaks (maxMenuW, maxMenuH);

        workOutManualSize (maxMenuW);
        height = jmin (contentHeight, maxMenuH);

        needsToScroll = contentHeight > height;

        width = updateYPositions();
    }

    void insertColumnBreaks (const int maxMenuW, const int maxMenuH)
    {
        numColumns = options.getMinimumNumColumns();
        contentHeight = 0;

        auto maximumNumColumns = options.getMaximumNumColumns() > 0 ? options.getMaximumNumColumns() : 7;

        for (;;)
        {
            auto totalW = workOutBestSize (maxMenuW);

            if (totalW > maxMenuW)
            {
                numColumns = jmax (1, numColumns - 1);
                workOutBestSize (maxMenuW); // to update col widths
                break;
            }

            if (totalW > maxMenuW / 2
                || contentHeight < maxMenuH
                || numColumns >= maximumNumColumns)
                break;

            ++numColumns;
        }

        const auto itemsPerColumn = (items.size() + numColumns - 1) / numColumns;

        for (auto i = 0;; i += itemsPerColumn)
        {
            const auto breakIndex = i + itemsPerColumn - 1;

            if (breakIndex >= items.size())
                break;

            items[breakIndex]->item.shouldBreakAfter = true;
        }

        if (! items.isEmpty())
            (*std::prev (items.end()))->item.shouldBreakAfter = false;
    }

    int correctColumnWidths (const int maxMenuW)
    {
        auto totalW = std::accumulate (columnWidths.begin(), columnWidths.end(), 0);
        const auto minWidth = jmin (maxMenuW, options.getMinimumWidth());

        if (totalW < minWidth)
        {
            totalW = minWidth;

            for (auto& column : columnWidths)
                column = totalW / numColumns;
        }

        return totalW;
    }

    void workOutManualSize (const int maxMenuW)
    {
        contentHeight = 0;
        columnWidths.clear();

        for (auto it = items.begin(), end = items.end(); it != end;)
        {
            const auto isBreak = [] (const ItemComponent* item) { return item->item.shouldBreakAfter; };
            const auto nextBreak = std::find_if (it, end, isBreak);
            const auto columnEnd = nextBreak == end ? end : std::next (nextBreak);

            const auto getMaxWidth = [] (int acc, const ItemComponent* item) { return jmax (acc, item->getWidth()); };
            const auto colW = std::accumulate (it, columnEnd, options.getStandardItemHeight(), getMaxWidth);
            const auto adjustedColW = jmin (maxMenuW / jmax (1, numColumns - 2),
                                            colW + getLookAndFeel().getPopupMenuBorderSizeWithOptions (options) * 2);

            const auto sumHeight = [] (int acc, const ItemComponent* item) { return acc + item->getHeight(); };
            const auto colH = std::accumulate (it, columnEnd, 0, sumHeight);

            contentHeight = jmax (contentHeight, colH);
            columnWidths.add (adjustedColW);
            it = columnEnd;
        }

        contentHeight += getLookAndFeel().getPopupMenuBorderSizeWithOptions (options) * 2;

        correctColumnWidths (maxMenuW);
    }

    int workOutBestSize (const int maxMenuW)
    {
        contentHeight = 0;
        int childNum = 0;

        for (int col = 0; col < numColumns; ++col)
        {
            int colW = options.getStandardItemHeight(), colH = 0;

            auto numChildren = jmin (items.size() - childNum,
                                     (items.size() + numColumns - 1) / numColumns);

            for (int i = numChildren; --i >= 0;)
            {
                colW = jmax (colW, items.getUnchecked (childNum + i)->getWidth());
                colH += items.getUnchecked (childNum + i)->getHeight();
            }

            colW = jmin (maxMenuW / jmax (1, numColumns - 2),
                         colW + getLookAndFeel().getPopupMenuBorderSizeWithOptions (options) * 2);

            columnWidths.set (col, colW);
            contentHeight = jmax (contentHeight, colH);

            childNum += numChildren;
        }

        return correctColumnWidths (maxMenuW);
    }

    void ensureItemComponentIsVisible (const ItemComponent& itemComp, int wantedY)
    {
        if (windowPos.getHeight() > PopupMenuSettings::scrollZone * 4)
        {
            auto currentY = itemComp.getY();

            if (wantedY > 0 || currentY < 0 || itemComp.getBottom() > windowPos.getHeight())
            {
                if (wantedY < 0)
                    wantedY = jlimit (PopupMenuSettings::scrollZone,
                                      jmax (PopupMenuSettings::scrollZone,
                                            windowPos.getHeight() - (PopupMenuSettings::scrollZone + itemComp.getHeight())),
                                      currentY);

                auto parentArea = getParentArea (windowPos.getPosition(), options.getParentComponent()) / scaleFactor;
                auto deltaY = wantedY - currentY;

                windowPos.setSize (jmin (windowPos.getWidth(), parentArea.getWidth()),
                                   jmin (windowPos.getHeight(), parentArea.getHeight()));

                auto newY = jlimit (parentArea.getY(),
                                    parentArea.getBottom() - windowPos.getHeight(),
                                    windowPos.getY() + deltaY);

                deltaY -= newY - windowPos.getY();

                childYOffset -= deltaY;
                windowPos.setPosition (windowPos.getX(), newY);

                updateYPositions();
            }
        }
    }

    void resizeToBestWindowPos()
    {
        auto r = windowPos;

        if (childYOffset < 0)
        {
            r = r.withTop (r.getY() - childYOffset);
        }
        else if (childYOffset > 0)
        {
            auto spaceAtBottom = r.getHeight() - (contentHeight - childYOffset);

            if (spaceAtBottom > 0)
                r.setSize (r.getWidth(), r.getHeight() - spaceAtBottom);
        }

        setBounds (r);
        updateYPositions();
    }

    void alterChildYPos (int delta)
    {
        if (canScroll())
        {
            childYOffset += delta;

            childYOffset = [&]
            {
                if (delta < 0)
                    return jmax (childYOffset, 0);

                if (delta > 0)
                {
                    const auto limit = contentHeight
                                        - windowPos.getHeight()
                                        + getLookAndFeel().getPopupMenuBorderSizeWithOptions (options);
                    return jmin (childYOffset, limit);
                }

                return childYOffset;
            }();

            updateYPositions();
        }
        else
        {
            childYOffset = 0;
        }

        resizeToBestWindowPos();
        repaint();
    }

    int updateYPositions()
    {
        const auto separatorWidth = getLookAndFeel().getPopupMenuColumnSeparatorWidthWithOptions (options);
        const auto initialY = getLookAndFeel().getPopupMenuBorderSizeWithOptions (options)
                              - (childYOffset + (getY() - windowPos.getY()));

        auto col = 0;
        auto x = 0;
        auto y = initialY;

        for (const auto& item : items)
        {
            jassert (col < columnWidths.size());
            const auto columnWidth = columnWidths[col];
            item->setBounds (x, y, columnWidth, item->getHeight());
            y += item->getHeight();

            if (item->item.shouldBreakAfter)
            {
                col += 1;
                x += columnWidth + separatorWidth;
                y = initialY;
            }
        }

        return std::accumulate (columnWidths.begin(), columnWidths.end(), 0)
               + (separatorWidth * (columnWidths.size() - 1));
    }

    void setCurrentlyHighlightedChild (ItemComponent* child)
    {
        if (currentChild != nullptr)
            currentChild->setHighlighted (false);

        currentChild = child;

        if (currentChild != nullptr)
        {
            currentChild->setHighlighted (true);
            timeEnteredCurrentChildComp = Time::getApproximateMillisecondCounter();
        }

        if (auto* handler = getAccessibilityHandler())
            handler->notifyAccessibilityEvent (AccessibilityEvent::rowSelectionChanged);
    }

    bool isSubMenuVisible() const noexcept          { return activeSubMenu != nullptr && activeSubMenu->isVisible(); }

    bool showSubMenuFor (ItemComponent* childComp)
    {
        activeSubMenu.reset();

        if (childComp != nullptr
             && hasActiveSubMenu (childComp->item))
        {
            activeSubMenu.reset (new HelperClasses::MenuWindow (*(childComp->item.subMenu), this,
                                                                options.withTargetScreenArea (childComp->getScreenBounds())
                                                                       .withMinimumWidth (0)
                                                                       .withTargetComponent (nullptr),
                                                                false, dismissOnMouseUp, managerOfChosenCommand, scaleFactor));

            activeSubMenu->setVisible (true); // (must be called before enterModalState on Windows to avoid DropShadower confusion)
            activeSubMenu->enterModalState (false);
            activeSubMenu->toFront (false);
            return true;
        }

        return false;
    }

    void triggerCurrentlyHighlightedItem()
    {
        if (currentChild != nullptr && canBeTriggered (currentChild->item))
        {
            dismissMenu (&currentChild->item);
        }
    }

    enum class MenuSelectionDirection
    {
        forwards,
        backwards,
        current
    };

    void selectNextItem (MenuSelectionDirection direction)
    {
        disableTimerUntilMouseMoves();

        auto start = [&]
        {
            auto index = items.indexOf (currentChild);

            if (index >= 0)
                return index;

            return direction == MenuSelectionDirection::backwards ? items.size() - 1
                                                                  : 0;
        }();

        auto preIncrement = (direction != MenuSelectionDirection::current && currentChild != nullptr);

        for (int i = items.size(); --i >= 0;)
        {
            if (preIncrement)
                start += (direction == MenuSelectionDirection::backwards ? -1 : 1);

            if (auto* mic = items.getUnchecked ((start + items.size()) % items.size()))
            {
                if (canBeTriggered (mic->item) || hasActiveSubMenu (mic->item))
                {
                    setCurrentlyHighlightedChild (mic);
                    return;
                }
            }

            if (! preIncrement)
                preIncrement = true;
        }
    }

    void disableTimerUntilMouseMoves()
    {
        disableMouseMoves = true;

        if (parent != nullptr)
            parent->disableTimerUntilMouseMoves();
    }

    bool canScroll() const noexcept                 { return childYOffset != 0 || needsToScroll; }
    bool isTopScrollZoneActive() const noexcept     { return canScroll() && childYOffset > 0; }
    bool isBottomScrollZoneActive() const noexcept  { return canScroll() && childYOffset < contentHeight - windowPos.getHeight(); }

    //==============================================================================
    std::unique_ptr<AccessibilityHandler> createAccessibilityHandler() override
    {
        return std::make_unique<AccessibilityHandler> (*this,
                                                       AccessibilityRole::popupMenu,
                                                       AccessibilityActions().addAction (AccessibilityActionType::focus, [this]
                                                       {
                                                           if (currentChild != nullptr)
                                                           {
                                                               if (auto* handler = currentChild->getAccessibilityHandler())
                                                                   handler->grabFocus();
                                                           }
                                                           else
                                                           {
                                                               selectNextItem (MenuSelectionDirection::forwards);
                                                           }
                                                       }));
    }

    //==============================================================================
    MenuWindow* parent;
    const Options options;
    OwnedArray<ItemComponent> items;
    ApplicationCommandManager** managerOfChosenCommand;
    WeakReference<Component> componentAttachedTo;
    Rectangle<int> windowPos;
    bool hasBeenOver = false, needsToScroll = false;
    bool dismissOnMouseUp, hideOnExit = false, disableMouseMoves = false, hasAnyJuceCompHadFocus = false;
    int numColumns = 0, contentHeight = 0, childYOffset = 0;
    Component::SafePointer<ItemComponent> currentChild;
    std::unique_ptr<MenuWindow> activeSubMenu;
    Array<int> columnWidths;
    uint32 windowCreationTime, lastFocusedTime, timeEnteredCurrentChildComp;
    OwnedArray<MouseSourceState> mouseSourceStates;
    float scaleFactor;
    bool exitingModalState = false;

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (MenuWindow)
};

//==============================================================================
class MouseSourceState  : public Timer
{
public:
    MouseSourceState (MenuWindow& w, MouseInputSource s)
        : window (w), source (s), lastScrollTime (Time::getMillisecondCounter())
    {
        startTimerHz (20);
    }

    void handleMouseEvent (const MouseEvent& e)
    {
        if (! window.windowIsStillValid())
            return;

        startTimerHz (20);
        handleMousePosition (e.getScreenPosition());
    }

    void timerCallback() override
    {
       #if JUCE_WINDOWS
        // touch and pen devices on Windows send an offscreen mouse move after mouse up events
        // but we don't want to forward these on as they will dismiss the menu
        if ((source.isTouch() || source.isPen()) && ! isValidMousePosition())
            return;
       #endif

        if (window.windowIsStillValid())
            handleMousePosition (source.getScreenPosition().roundToInt());
    }

    bool isOver() const
    {
        return window.reallyContains (window.getLocalPoint (nullptr, source.getScreenPosition()).roundToInt(), true);
    }

    MenuWindow& window;
    MouseInputSource source;

private:
    Point<int> lastMousePos;
    double scrollAcceleration = 0;
    uint32 lastScrollTime, lastMouseMoveTime = 0;
    bool isDown = false;

    void handleMousePosition (Point<int> globalMousePos)
    {
        auto localMousePos = window.getLocalPoint (nullptr, globalMousePos);
        auto timeNow = Time::getMillisecondCounter();

        if (timeNow > window.timeEnteredCurrentChildComp + 100
             && window.reallyContains (localMousePos, true)
             && window.currentChild != nullptr
             && ! (window.disableMouseMoves || window.isSubMenuVisible()))
        {
            window.showSubMenuFor (window.currentChild);
        }

        highlightItemUnderMouse (globalMousePos, localMousePos, timeNow);

        const bool overScrollArea = scrollIfNecessary (localMousePos, timeNow);
        const bool isOverAny = window.isOverAnyMenu();

        if (window.hideOnExit && window.hasBeenOver && ! isOverAny)
            window.hide (nullptr, true);
        else
            checkButtonState (localMousePos, timeNow, isDown, overScrollArea, isOverAny);
    }

    void checkButtonState (Point<int> localMousePos, const uint32 timeNow,
                           const bool wasDown, const bool overScrollArea, const bool isOverAny)
    {
        isDown = window.hasBeenOver
                    && (ModifierKeys::currentModifiers.isAnyMouseButtonDown()
                         || ComponentPeer::getCurrentModifiersRealtime().isAnyMouseButtonDown());

        if (! window.doesAnyJuceCompHaveFocus())
        {
            if (timeNow > window.lastFocusedTime + 10)
            {
                PopupMenuSettings::menuWasHiddenBecauseOfAppChange = true;
                window.dismissMenu (nullptr);
                // Note: This object may have been deleted by the previous call.
            }
        }
        else if (wasDown && timeNow > window.windowCreationTime + 250
                   && ! (isDown || overScrollArea))
        {
            if (window.reallyContains (localMousePos, true))
                window.triggerCurrentlyHighlightedItem();
            else if ((window.hasBeenOver || ! window.dismissOnMouseUp) && ! isOverAny)
                window.dismissMenu (nullptr);

            // Note: This object may have been deleted by the previous call.
        }
        else
        {
            window.lastFocusedTime = timeNow;
        }
    }

    void highlightItemUnderMouse (Point<int> globalMousePos, Point<int> localMousePos, const uint32 timeNow)
    {
        if (globalMousePos != lastMousePos || timeNow > lastMouseMoveTime + 350)
        {
            const auto isMouseOver = window.reallyContains (localMousePos, true);

            if (isMouseOver)
                window.hasBeenOver = true;

            if (lastMousePos.getDistanceFrom (globalMousePos) > 2)
            {
                lastMouseMoveTime = timeNow;

                if (window.disableMouseMoves && isMouseOver)
                    window.disableMouseMoves = false;
            }

            if (window.disableMouseMoves || (window.activeSubMenu != nullptr && window.activeSubMenu->isOverChildren()))
                return;

            const bool isMovingTowardsMenu = isMouseOver && globalMousePos != lastMousePos
                                                && isMovingTowardsSubmenu (globalMousePos);

            lastMousePos = globalMousePos;

            if (! isMovingTowardsMenu)
            {
                auto* c = window.getComponentAt (localMousePos);

                if (c == &window)
                    c = nullptr;

                auto* itemUnderMouse = dynamic_cast<ItemComponent*> (c);

                if (itemUnderMouse == nullptr && c != nullptr)
                    itemUnderMouse = c->findParentComponentOfClass<ItemComponent>();

                if (itemUnderMouse != window.currentChild
                      && (isMouseOver || (window.activeSubMenu == nullptr) || ! window.activeSubMenu->isVisible()))
                {
                    if (isMouseOver && (c != nullptr) && (window.activeSubMenu != nullptr))
                        window.activeSubMenu->hide (nullptr, true);

                    if (! isMouseOver)
                    {
                        if (! window.hasBeenOver)
                            return;

                        itemUnderMouse = nullptr;
                    }

                    window.setCurrentlyHighlightedChild (itemUnderMouse);
                }
            }
        }
    }

    bool isMovingTowardsSubmenu (Point<int> newGlobalPos) const
    {
        if (window.activeSubMenu == nullptr)
            return false;

        // try to intelligently guess whether the user is moving the mouse towards a currently-open
        // submenu. To do this, look at whether the mouse stays inside a triangular region that
        // extends from the last mouse pos to the submenu's rectangle..

        auto itemScreenBounds = window.activeSubMenu->getScreenBounds();
        auto subX = (float) itemScreenBounds.getX();

        auto oldGlobalPos = lastMousePos;

        if (itemScreenBounds.getX() > window.getX())
        {
            oldGlobalPos -= Point<int> (2, 0);  // to enlarge the triangle a bit, in case the mouse only moves a couple of pixels
        }
        else
        {
            oldGlobalPos += Point<int> (2, 0);
            subX += (float) itemScreenBounds.getWidth();
        }

        Path areaTowardsSubMenu;
        areaTowardsSubMenu.addTriangle ((float) oldGlobalPos.x, (float) oldGlobalPos.y,
                                        subX, (float) itemScreenBounds.getY(),
                                        subX, (float) itemScreenBounds.getBottom());

        return areaTowardsSubMenu.contains (newGlobalPos.toFloat());
    }

    bool scrollIfNecessary (Point<int> localMousePos, const uint32 timeNow)
    {
        if (window.canScroll()
             && isPositiveAndBelow (localMousePos.x, window.getWidth())
             && (isPositiveAndBelow (localMousePos.y, window.getHeight()) || source.isDragging()))
        {
            if (window.isTopScrollZoneActive() && localMousePos.y < PopupMenuSettings::scrollZone)
                return scroll (timeNow, -1);

            if (window.isBottomScrollZoneActive() && localMousePos.y > window.getHeight() - PopupMenuSettings::scrollZone)
                return scroll (timeNow, 1);
        }

        scrollAcceleration = 1.0;
        return false;
    }

    bool scroll (const uint32 timeNow, const int direction)
    {
        if (timeNow > lastScrollTime + 20)
        {
            scrollAcceleration = jmin (4.0, scrollAcceleration * 1.04);
            int amount = 0;

            for (int i = 0; i < window.items.size() && amount == 0; ++i)
                amount = ((int) scrollAcceleration) * window.items.getUnchecked (i)->getHeight();

            window.alterChildYPos (amount * direction);
            lastScrollTime = timeNow;
        }

        return true;
    }

   #if JUCE_WINDOWS
    bool isValidMousePosition()
    {
        auto screenPos = source.getScreenPosition();
        auto localPos = (window.activeSubMenu == nullptr) ? window.getLocalPoint (nullptr, screenPos)
                                                          : window.activeSubMenu->getLocalPoint (nullptr, screenPos);

        if (localPos.x < 0 && localPos.y < 0)
            return false;

        return true;
    }
   #endif

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (MouseSourceState)
};

//==============================================================================
struct NormalComponentWrapper : public PopupMenu::CustomComponent
{
    NormalComponentWrapper (Component& comp, int w, int h, bool triggerMenuItemAutomaticallyWhenClicked)
        : PopupMenu::CustomComponent (triggerMenuItemAutomaticallyWhenClicked),
          width (w), height (h)
    {
        addAndMakeVisible (comp);
    }

    void getIdealSize (int& idealWidth, int& idealHeight) override
    {
        idealWidth = width;
        idealHeight = height;
    }

    void resized() override
    {
        if (auto* child = getChildComponent (0))
            child->setBounds (getLocalBounds());
    }

    const int width, height;

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (NormalComponentWrapper)
};

};

//==============================================================================
PopupMenu::PopupMenu (const PopupMenu& other)
    : items (other.items),
      lookAndFeel (other.lookAndFeel)
{
}

PopupMenu& PopupMenu::operator= (const PopupMenu& other)
{
    if (this != &other)
    {
        items = other.items;
        lookAndFeel = other.lookAndFeel;
    }

    return *this;
}

PopupMenu::PopupMenu (PopupMenu&& other) noexcept
    : items (std::move (other.items)),
      lookAndFeel (std::move (other.lookAndFeel))
{
}

PopupMenu& PopupMenu::operator= (PopupMenu&& other) noexcept
{
    items = std::move (other.items);
    lookAndFeel = other.lookAndFeel;
    return *this;
}

PopupMenu::~PopupMenu() = default;

void PopupMenu::clear()
{
    items.clear();
}

//==============================================================================
PopupMenu::Item::Item() = default;
PopupMenu::Item::Item (String t) : text (std::move (t)), itemID (-1) {}

PopupMenu::Item::Item (Item&&) = default;
PopupMenu::Item& PopupMenu::Item::operator= (Item&&) = default;

PopupMenu::Item::Item (const Item& other)
  : text (other.text),
    itemID (other.itemID),
    action (other.action),
    subMenu (createCopyIfNotNull (other.subMenu.get())),
    image (other.image != nullptr ? other.image->createCopy() : nullptr),
    customComponent (other.customComponent),
    customCallback (other.customCallback),
    commandManager (other.commandManager),
    shortcutKeyDescription (other.shortcutKeyDescription),
    colour (other.colour),
    isEnabled (other.isEnabled),
    isTicked (other.isTicked),
    isSeparator (other.isSeparator),
    isSectionHeader (other.isSectionHeader),
    shouldBreakAfter (other.shouldBreakAfter)
{}

PopupMenu::Item& PopupMenu::Item::operator= (const Item& other)
{
    text = other.text;
    itemID = other.itemID;
    action = other.action;
    subMenu.reset (createCopyIfNotNull (other.subMenu.get()));
    image = other.image != nullptr ? other.image->createCopy() : std::unique_ptr<Drawable>();
    customComponent = other.customComponent;
    customCallback = other.customCallback;
    commandManager = other.commandManager;
    shortcutKeyDescription = other.shortcutKeyDescription;
    colour = other.colour;
    isEnabled = other.isEnabled;
    isTicked = other.isTicked;
    isSeparator = other.isSeparator;
    isSectionHeader = other.isSectionHeader;
    shouldBreakAfter = other.shouldBreakAfter;
    return *this;
}

PopupMenu::Item& PopupMenu::Item::setTicked (bool shouldBeTicked) & noexcept
{
    isTicked = shouldBeTicked;
    return *this;
}

PopupMenu::Item& PopupMenu::Item::setEnabled (bool shouldBeEnabled) & noexcept
{
    isEnabled = shouldBeEnabled;
    return *this;
}

PopupMenu::Item& PopupMenu::Item::setAction (std::function<void()> newAction) & noexcept
{
    action = std::move (newAction);
    return *this;
}

PopupMenu::Item& PopupMenu::Item::setID (int newID) & noexcept
{
    itemID = newID;
    return *this;
}

PopupMenu::Item& PopupMenu::Item::setColour (Colour newColour) & noexcept
{
    colour = newColour;
    return *this;
}

PopupMenu::Item& PopupMenu::Item::setCustomComponent (ReferenceCountedObjectPtr<CustomComponent> comp) & noexcept
{
    customComponent = comp;
    return *this;
}

PopupMenu::Item& PopupMenu::Item::setImage (std::unique_ptr<Drawable> newImage) & noexcept
{
    image = std::move (newImage);
    return *this;
}

PopupMenu::Item&& PopupMenu::Item::setTicked (bool shouldBeTicked) && noexcept
{
    isTicked = shouldBeTicked;
    return std::move (*this);
}

PopupMenu::Item&& PopupMenu::Item::setEnabled (bool shouldBeEnabled) && noexcept
{
    isEnabled = shouldBeEnabled;
    return std::move (*this);
}

PopupMenu::Item&& PopupMenu::Item::setAction (std::function<void()> newAction) && noexcept
{
    action = std::move (newAction);
    return std::move (*this);
}

PopupMenu::Item&& PopupMenu::Item::setID (int newID) && noexcept
{
    itemID = newID;
    return std::move (*this);
}

PopupMenu::Item&& PopupMenu::Item::setColour (Colour newColour) && noexcept
{
    colour = newColour;
    return std::move (*this);
}

PopupMenu::Item&& PopupMenu::Item::setCustomComponent (ReferenceCountedObjectPtr<CustomComponent> comp) && noexcept
{
    customComponent = comp;
    return std::move (*this);
}

PopupMenu::Item&& PopupMenu::Item::setImage (std::unique_ptr<Drawable> newImage) && noexcept
{
    image = std::move (newImage);
    return std::move (*this);
}

void PopupMenu::addItem (Item newItem)
{
    // An ID of 0 is used as a return value to indicate that the user
    // didn't pick anything, so you shouldn't use it as the ID for an item.
    jassert (newItem.itemID != 0
              || newItem.isSeparator || newItem.isSectionHeader
              || newItem.subMenu != nullptr);

    items.add (std::move (newItem));
}

void PopupMenu::addItem (String itemText, std::function<void()> action)
{
    addItem (std::move (itemText), true, false, std::move (action));
}

void PopupMenu::addItem (String itemText, bool isActive, bool isTicked, std::function<void()> action)
{
    Item i (std::move (itemText));
    i.action = std::move (action);
    i.isEnabled = isActive;
    i.isTicked = isTicked;
    addItem (std::move (i));
}

void PopupMenu::addItem (int itemResultID, String itemText, bool isActive, bool isTicked)
{
    Item i (std::move (itemText));
    i.itemID = itemResultID;
    i.isEnabled = isActive;
    i.isTicked = isTicked;
    addItem (std::move (i));
}

static std::unique_ptr<Drawable> createDrawableFromImage (const Image& im)
{
    if (im.isValid())
    {
        auto d = new DrawableImage();
        d->setImage (im);
        return std::unique_ptr<Drawable> (d);
    }

    return {};
}

void PopupMenu::addItem (int itemResultID, String itemText, bool isActive, bool isTicked, const Image& iconToUse)
{
    addItem (itemResultID, std::move (itemText), isActive, isTicked, createDrawableFromImage (iconToUse));
}

void PopupMenu::addItem (int itemResultID, String itemText, bool isActive,
                         bool isTicked, std::unique_ptr<Drawable> iconToUse)
{
    Item i (std::move (itemText));
    i.itemID = itemResultID;
    i.isEnabled = isActive;
    i.isTicked = isTicked;
    i.image = std::move (iconToUse);
    addItem (std::move (i));
}

void PopupMenu::addCommandItem (ApplicationCommandManager* commandManager,
                                const CommandID commandID,
                                String displayName,
                                std::unique_ptr<Drawable> iconToUse)
{
    jassert (commandManager != nullptr && commandID != 0);

    if (auto* registeredInfo = commandManager->getCommandForID (commandID))
    {
        ApplicationCommandInfo info (*registeredInfo);
        auto* target = commandManager->getTargetForCommand (commandID, info);

        Item i;
        i.text = displayName.isNotEmpty() ? std::move (displayName) : info.shortName;
        i.itemID = (int) commandID;
        i.commandManager = commandManager;
        i.isEnabled = target != nullptr && (info.flags & ApplicationCommandInfo::isDisabled) == 0;
        i.isTicked = (info.flags & ApplicationCommandInfo::isTicked) != 0;
        i.image = std::move (iconToUse);
        addItem (std::move (i));
    }
}

void PopupMenu::addColouredItem (int itemResultID, String itemText, Colour itemTextColour,
                                 bool isActive, bool isTicked, std::unique_ptr<Drawable> iconToUse)
{
    Item i (std::move (itemText));
    i.itemID = itemResultID;
    i.colour = itemTextColour;
    i.isEnabled = isActive;
    i.isTicked = isTicked;
    i.image = std::move (iconToUse);
    addItem (std::move (i));
}

void PopupMenu::addColouredItem (int itemResultID, String itemText, Colour itemTextColour,
                                 bool isActive, bool isTicked, const Image& iconToUse)
{
    Item i (std::move (itemText));
    i.itemID = itemResultID;
    i.colour = itemTextColour;
    i.isEnabled = isActive;
    i.isTicked = isTicked;
    i.image = createDrawableFromImage (iconToUse);
    addItem (std::move (i));
}

void PopupMenu::addCustomItem (int itemResultID,
                               std::unique_ptr<CustomComponent> cc,
                               std::unique_ptr<const PopupMenu> subMenu,
                               const String& itemTitle)
{
    Item i;
    i.text = itemTitle;
    i.itemID = itemResultID;
    i.customComponent = cc.release();
    i.subMenu.reset (createCopyIfNotNull (subMenu.get()));

    // If this assertion is hit, this item will be visible to screen readers but with
    // no name, which may be confusing to users.
    // It's probably a good idea to add a title for this menu item that describes
    // the meaning of the item, or the contents of the submenu, as appropriate.
    // If you don't want this menu item to be press-able directly, pass "false" to the
    // constructor of the CustomComponent.
    jassert (! (HelperClasses::ItemComponent::isAccessibilityHandlerRequired (i) && itemTitle.isEmpty()));

    addItem (std::move (i));
}

void PopupMenu::addCustomItem (int itemResultID,
                               Component& customComponent,
                               int idealWidth, int idealHeight,
                               bool triggerMenuItemAutomaticallyWhenClicked,
                               std::unique_ptr<const PopupMenu> subMenu,
                               const String& itemTitle)
{
    auto comp = std::make_unique<HelperClasses::NormalComponentWrapper> (customComponent, idealWidth, idealHeight,
                                                                         triggerMenuItemAutomaticallyWhenClicked);
    addCustomItem (itemResultID, std::move (comp), std::move (subMenu), itemTitle);
}

void PopupMenu::addSubMenu (String subMenuName, PopupMenu subMenu, bool isActive)
{
    addSubMenu (std::move (subMenuName), std::move (subMenu), isActive, nullptr, false, 0);
}

void PopupMenu::addSubMenu (String subMenuName, PopupMenu subMenu, bool isActive,
                            const Image& iconToUse, bool isTicked, int itemResultID)
{
    addSubMenu (std::move (subMenuName), std::move (subMenu), isActive,
                createDrawableFromImage (iconToUse), isTicked, itemResultID);
}

void PopupMenu::addSubMenu (String subMenuName, PopupMenu subMenu, bool isActive,
                            std::unique_ptr<Drawable> iconToUse, bool isTicked, int itemResultID)
{
    Item i (std::move (subMenuName));
    i.itemID = itemResultID;
    i.isEnabled = isActive && (itemResultID != 0 || subMenu.getNumItems() > 0);
    i.subMenu.reset (new PopupMenu (std::move (subMenu)));
    i.isTicked = isTicked;
    i.image = std::move (iconToUse);
    addItem (std::move (i));
}

void PopupMenu::addSeparator()
{
    if (items.size() > 0 && ! items.getLast().isSeparator)
    {
        Item i;
        i.isSeparator = true;
        addItem (std::move (i));
    }
}

void PopupMenu::addSectionHeader (String title)
{
    Item i (std::move (title));
    i.itemID = 0;
    i.isSectionHeader = true;
    addItem (std::move (i));
}

void PopupMenu::addColumnBreak()
{
    if (! items.isEmpty())
        std::prev (items.end())->shouldBreakAfter = true;
}

//==============================================================================
PopupMenu::Options::Options()
{
    targetArea.setPosition (Desktop::getMousePosition());
}

template <typename Member, typename Item>
static PopupMenu::Options with (PopupMenu::Options options, Member&& member, Item&& item)
{
    options.*member = std::forward<Item> (item);
    return options;
}

PopupMenu::Options PopupMenu::Options::withTargetComponent (Component* comp) const
{
    auto o = with (*this, &Options::targetComponent, comp);

    if (comp != nullptr)
        o.targetArea = comp->getScreenBounds();

    return o;
}

PopupMenu::Options PopupMenu::Options::withTargetComponent (Component& comp) const
{
    return withTargetComponent (&comp);
}

PopupMenu::Options PopupMenu::Options::withTargetScreenArea (Rectangle<int> area) const
{
    return with (*this, &Options::targetArea, area);
}

PopupMenu::Options PopupMenu::Options::withMousePosition() const
{
    return withTargetScreenArea (Rectangle<int>{}.withPosition (Desktop::getMousePosition()));
}

PopupMenu::Options PopupMenu::Options::withDeletionCheck (Component& comp) const
{
    return with (with (*this, &Options::isWatchingForDeletion, true),
                 &Options::componentToWatchForDeletion,
                 &comp);
}

PopupMenu::Options PopupMenu::Options::withMinimumWidth (int w) const
{
    return with (*this, &Options::minWidth, w);
}

PopupMenu::Options PopupMenu::Options::withMinimumNumColumns (int cols) const
{
    return with (*this, &Options::minColumns, cols);
}

PopupMenu::Options PopupMenu::Options::withMaximumNumColumns (int cols) const
{
    return with (*this, &Options::maxColumns, cols);
}

PopupMenu::Options PopupMenu::Options::withStandardItemHeight (int height) const
{
    return with (*this, &Options::standardHeight, height);
}

PopupMenu::Options PopupMenu::Options::withItemThatMustBeVisible (int idOfItemToBeVisible) const
{
    return with (*this, &Options::visibleItemID, idOfItemToBeVisible);
}

PopupMenu::Options PopupMenu::Options::withParentComponent (Component* parent) const
{
    return with (*this, &Options::parentComponent, parent);
}

PopupMenu::Options PopupMenu::Options::withPreferredPopupDirection (PopupDirection direction) const
{
    return with (*this, &Options::preferredPopupDirection, direction);
}

PopupMenu::Options PopupMenu::Options::withInitiallySelectedItem (int idOfItemToBeSelected) const
{
    return with (*this, &Options::initiallySelectedItemId, idOfItemToBeSelected);
}

Component* PopupMenu::createWindow (const Options& options,
                                    ApplicationCommandManager** managerOfChosenCommand) const
{
   #if JUCE_WINDOWS
    const auto scope = [&]() -> std::unique_ptr<ScopedThreadDPIAwarenessSetter>
    {
        if (auto* target = options.getTargetComponent())
            if (auto* handle = target->getWindowHandle())
                return std::make_unique<ScopedThreadDPIAwarenessSetter> (handle);

        return nullptr;
    }();
   #endif

    return items.isEmpty() ? nullptr
                           : new HelperClasses::MenuWindow (*this, nullptr, options,
                                                            ! options.getTargetScreenArea().isEmpty(),
                                                            ModifierKeys::currentModifiers.isAnyMouseButtonDown(),
                                                            managerOfChosenCommand);
}

//==============================================================================
// This invokes any command manager commands and deletes the menu window when it is dismissed
struct PopupMenuCompletionCallback  : public ModalComponentManager::Callback
{
    PopupMenuCompletionCallback() = default;

    void modalStateFinished (int result) override
    {
        if (managerOfChosenCommand != nullptr && result != 0)
        {
            ApplicationCommandTarget::InvocationInfo info (result);
            info.invocationMethod = ApplicationCommandTarget::InvocationInfo::fromMenu;

            managerOfChosenCommand->invoke (info, true);
        }

        // (this would be the place to fade out the component, if that's what's required)
        component.reset();

        if (PopupMenuSettings::menuWasHiddenBecauseOfAppChange)
            return;

        if (auto* focusComponent = Component::getCurrentlyFocusedComponent())
        {
            const auto focusedIsNotMinimised = [focusComponent]
            {
                if (auto* peer = focusComponent->getPeer())
                    return ! peer->isMinimised();

                return false;
            }();

            if (focusedIsNotMinimised)
            {
                if (auto* topLevel = focusComponent->getTopLevelComponent())
                    topLevel->toFront (true);

                if (focusComponent->isShowing() && ! focusComponent->hasKeyboardFocus (true))
                    focusComponent->grabKeyboardFocus();
            }
        }
    }

    ApplicationCommandManager* managerOfChosenCommand = nullptr;
    std::unique_ptr<Component> component;

    JUCE_DECLARE_NON_COPYABLE (PopupMenuCompletionCallback)
};

int PopupMenu::showWithOptionalCallback (const Options& options,
                                         ModalComponentManager::Callback* userCallback,
                                         bool canBeModal)
{
    std::unique_ptr<ModalComponentManager::Callback> userCallbackDeleter (userCallback);
    std::unique_ptr<PopupMenuCompletionCallback> callback (new PopupMenuCompletionCallback());

    if (auto* window = createWindow (options, &(callback->managerOfChosenCommand)))
    {
        callback->component.reset (window);

        PopupMenuSettings::menuWasHiddenBecauseOfAppChange = false;

        window->setVisible (true); // (must be called before enterModalState on Windows to avoid DropShadower confusion)
        window->enterModalState (false, userCallbackDeleter.release());
        ModalComponentManager::getInstance()->attachCallback (window, callback.release());

        window->toFront (false);  // need to do this after making it modal, or it could
                                  // be stuck behind other comps that are already modal..

       #if JUCE_MODAL_LOOPS_PERMITTED
        if (userCallback == nullptr && canBeModal)
            return window->runModalLoop();
       #else
        ignoreUnused (canBeModal);
        jassert (! (userCallback == nullptr && canBeModal));
       #endif
    }

    return 0;
}

//==============================================================================
#if JUCE_MODAL_LOOPS_PERMITTED
int PopupMenu::showMenu (const Options& options)
{
    return showWithOptionalCallback (options, nullptr, true);
}
#endif

void PopupMenu::showMenuAsync (const Options& options)
{
    showWithOptionalCallback (options, nullptr, false);
}

void PopupMenu::showMenuAsync (const Options& options, ModalComponentManager::Callback* userCallback)
{
   #if ! JUCE_MODAL_LOOPS_PERMITTED
    jassert (userCallback != nullptr);
   #endif

    showWithOptionalCallback (options, userCallback, false);
}

void PopupMenu::showMenuAsync (const Options& options, std::function<void (int)> userCallback)
{
    showWithOptionalCallback (options, ModalCallbackFunction::create (userCallback), false);
}

//==============================================================================
#if JUCE_MODAL_LOOPS_PERMITTED
int PopupMenu::show (int itemIDThatMustBeVisible, int minimumWidth,
                     int maximumNumColumns, int standardItemHeight,
                     ModalComponentManager::Callback* callback)
{
    return showWithOptionalCallback (Options().withItemThatMustBeVisible (itemIDThatMustBeVisible)
                                              .withMinimumWidth (minimumWidth)
                                              .withMaximumNumColumns (maximumNumColumns)
                                              .withStandardItemHeight (standardItemHeight),
                                     callback, true);
}

int PopupMenu::showAt (Rectangle<int> screenAreaToAttachTo,
                       int itemIDThatMustBeVisible, int minimumWidth,
                       int maximumNumColumns, int standardItemHeight,
                       ModalComponentManager::Callback* callback)
{
    return showWithOptionalCallback (Options().withTargetScreenArea (screenAreaToAttachTo)
                                              .withItemThatMustBeVisible (itemIDThatMustBeVisible)
                                              .withMinimumWidth (minimumWidth)
                                              .withMaximumNumColumns (maximumNumColumns)
                                              .withStandardItemHeight (standardItemHeight),
                                     callback, true);
}

int PopupMenu::showAt (Component* componentToAttachTo,
                       int itemIDThatMustBeVisible, int minimumWidth,
                       int maximumNumColumns, int standardItemHeight,
                       ModalComponentManager::Callback* callback)
{
    auto options = Options().withItemThatMustBeVisible (itemIDThatMustBeVisible)
                            .withMinimumWidth (minimumWidth)
                            .withMaximumNumColumns (maximumNumColumns)
                            .withStandardItemHeight (standardItemHeight);

    if (componentToAttachTo != nullptr)
        options = options.withTargetComponent (componentToAttachTo);

    return showWithOptionalCallback (options, callback, true);
}
#endif

bool JUCE_CALLTYPE PopupMenu::dismissAllActiveMenus()
{
    auto& windows = HelperClasses::MenuWindow::getActiveWindows();
    auto numWindows = windows.size();

    for (int i = numWindows; --i >= 0;)
    {
        if (auto* pmw = windows[i])
        {
            pmw->setLookAndFeel (nullptr);
            pmw->dismissMenu (nullptr);
        }
    }

    return numWindows > 0;
}

//==============================================================================
int PopupMenu::getNumItems() const noexcept
{
    int num = 0;

    for (auto& mi : items)
        if (! mi.isSeparator)
            ++num;

    return num;
}

bool PopupMenu::containsCommandItem (const int commandID) const
{
    for (auto& mi : items)
        if ((mi.itemID == commandID && mi.commandManager != nullptr)
              || (mi.subMenu != nullptr && mi.subMenu->containsCommandItem (commandID)))
            return true;

    return false;
}

bool PopupMenu::containsAnyActiveItems() const noexcept
{
    for (auto& mi : items)
    {
        if (mi.subMenu != nullptr)
        {
            if (mi.subMenu->containsAnyActiveItems())
                return true;
        }
        else if (mi.isEnabled)
        {
            return true;
        }
    }

    return false;
}

void PopupMenu::setLookAndFeel (LookAndFeel* const newLookAndFeel)
{
    lookAndFeel = newLookAndFeel;
}

void PopupMenu::setItem (CustomComponent& c, const Item* itemToUse)
{
    c.item = itemToUse;
    c.repaint();
}

//==============================================================================
PopupMenu::CustomComponent::CustomComponent() : CustomComponent (true) {}

PopupMenu::CustomComponent::CustomComponent (bool autoTrigger)
    : triggeredAutomatically (autoTrigger)
{
}

void PopupMenu::CustomComponent::setHighlighted (bool shouldBeHighlighted)
{
    isHighlighted = shouldBeHighlighted;
    repaint();
}

void PopupMenu::CustomComponent::triggerMenuItem()
{
    if (auto* mic = findParentComponentOfClass<HelperClasses::ItemComponent>())
    {
        if (auto* pmw = mic->findParentComponentOfClass<HelperClasses::MenuWindow>())
        {
            pmw->dismissMenu (&mic->item);
        }
        else
        {
            // something must have gone wrong with the component hierarchy if this happens..
            jassertfalse;
        }
    }
    else
    {
        // why isn't this component inside a menu? Not much point triggering the item if
        // there's no menu.
        jassertfalse;
    }
}

//==============================================================================
PopupMenu::CustomCallback::CustomCallback() {}
PopupMenu::CustomCallback::~CustomCallback() {}

//==============================================================================
PopupMenu::MenuItemIterator::MenuItemIterator (const PopupMenu& m, bool recurse) : searchRecursively (recurse)
{
    index.add (0);
    menus.add (&m);
}

PopupMenu::MenuItemIterator::~MenuItemIterator() = default;

bool PopupMenu::MenuItemIterator::next()
{
    if (index.size() == 0 || menus.getLast()->items.size() == 0)
        return false;

    currentItem = const_cast<PopupMenu::Item*> (&(menus.getLast()->items.getReference (index.getLast())));

    if (searchRecursively && currentItem->subMenu != nullptr)
    {
        index.add (0);
        menus.add (currentItem->subMenu.get());
    }
    else
    {
        index.setUnchecked (index.size() - 1, index.getLast() + 1);
    }

    while (index.size() > 0 && index.getLast() >= (int) menus.getLast()->items.size())
    {
        index.removeLast();
        menus.removeLast();

        if (index.size() > 0)
            index.setUnchecked (index.size() - 1, index.getLast() + 1);
    }

    return true;
}

PopupMenu::Item& PopupMenu::MenuItemIterator::getItem() const
{
    jassert (currentItem != nullptr);
    return *(currentItem);
}

void PopupMenu::LookAndFeelMethods::drawPopupMenuBackground (Graphics&, int, int) {}

void PopupMenu::LookAndFeelMethods::drawPopupMenuItem (Graphics&, const Rectangle<int>&,
                                                       bool, bool, bool,
                                                       bool, bool,
                                                       const String&,
                                                       const String&,
                                                       const Drawable*,
                                                       const Colour*) {}

void PopupMenu::LookAndFeelMethods::drawPopupMenuSectionHeader (Graphics&, const Rectangle<int>&,
                                                                const String&) {}

void PopupMenu::LookAndFeelMethods::drawPopupMenuUpDownArrow (Graphics&, int, int, bool) {}

void PopupMenu::LookAndFeelMethods::getIdealPopupMenuItemSize (const String&, bool, int, int&, int&) {}

int PopupMenu::LookAndFeelMethods::getPopupMenuBorderSize() { return 0; }

} // namespace juce