JUCE/extras/Projucer/Source/ComponentEditor/UI/jucer_JucerDocumentEditor.cpp

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

   This file is part of the JUCE 6 technical preview.
   Copyright (c) 2020 - Raw Material Software Limited

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

   For this technical preview, this file is not subject to commercial licensing.

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

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

#include "../../Application/jucer_Headers.h"
#include "../../Settings/jucer_AppearanceSettings.h"
#include "../../Application/jucer_Application.h"
#include "jucer_JucerDocumentEditor.h"
#include "jucer_TestComponent.h"
#include "../jucer_ObjectTypes.h"
#include "jucer_ComponentLayoutPanel.h"
#include "jucer_PaintRoutinePanel.h"
#include "jucer_ResourceEditorPanel.h"
#include "../Properties/jucer_ComponentTextProperty.h"
#include "../Properties/jucer_ComponentChoiceProperty.h"
#include "../UI/jucer_JucerCommandIDs.h"

//==============================================================================
class ExtraMethodsList  : public PropertyComponent,
                          public ListBoxModel,
                          public ChangeListener
{
public:
    ExtraMethodsList (JucerDocument& doc)
        : PropertyComponent ("extra callbacks", 250),
          document (doc)
    {
        listBox.reset (new ListBox (String(), this));
        addAndMakeVisible (listBox.get());
        listBox->setRowHeight (22);

        document.addChangeListener (this);
    }

    ~ExtraMethodsList() override
    {
        document.removeChangeListener (this);
    }

    int getNumRows() override
    {
        return methods.size();
    }

    void paintListBoxItem (int row, Graphics& g, int width, int height, bool rowIsSelected) override
    {
        if (row < 0 || row >= getNumRows())
            return;

        if (rowIsSelected)
        {
            g.fillAll (findColour (TextEditor::highlightColourId));
            g.setColour (findColour (defaultHighlightedTextColourId));
        }
        else
        {
            g.setColour (findColour (defaultTextColourId));
        }

        g.setFont (height * 0.6f);
        g.drawText (returnValues [row] + " " + baseClasses [row] + "::" + methods [row],
                    30, 0, width - 32, height,
                    Justification::centredLeft, true);

        getLookAndFeel().drawTickBox (g, *this, 6, 2, 18, 18, document.isOptionalMethodEnabled (methods [row]), true, false, false);
    }

    void listBoxItemClicked (int row, const MouseEvent& e) override
    {
        if (row < 0 || row >= getNumRows())
            return;

        if (e.x < 30)
            document.setOptionalMethodEnabled (methods [row],
                                               ! document.isOptionalMethodEnabled (methods [row]));
    }

    void paint (Graphics& g) override
    {
        g.fillAll (Colours::white);
    }

    void resized() override
    {
        listBox->setBounds (getLocalBounds());
    }

    void refresh() override
    {
        baseClasses.clear();
        returnValues.clear();
        methods.clear();
        initialContents.clear();

        document.getOptionalMethods (baseClasses, returnValues, methods, initialContents);

        listBox->updateContent();
        listBox->repaint();
    }

    void changeListenerCallback (ChangeBroadcaster*) override
    {
        refresh();
    }

private:
    JucerDocument& document;
    std::unique_ptr<ListBox> listBox;

    StringArray baseClasses, returnValues, methods, initialContents;
};


//==============================================================================
class ClassPropertiesPanel  : public Component,
                              private ChangeListener
{
public:
    explicit ClassPropertiesPanel (JucerDocument& doc)
        : document (doc)
    {
        addAndMakeVisible (panel1);
        addAndMakeVisible (panel2);

        Array <PropertyComponent*> props;
        props.add (new ComponentClassNameProperty (doc));
        props.add (new TemplateFileProperty (doc));
        props.add (new ComponentCompNameProperty (doc));
        props.add (new ComponentParentClassesProperty (doc));
        props.add (new ComponentConstructorParamsProperty (doc));
        props.add (new ComponentInitialisersProperty (doc));
        props.add (new ComponentInitialSizeProperty (doc, true));
        props.add (new ComponentInitialSizeProperty (doc, false));
        props.add (new FixedSizeProperty (doc));

        panel1.addSection ("General class settings", props);

        Array <PropertyComponent*> props2;
        props2.add (new ExtraMethodsList (doc));
        panel2.addSection ("Extra callback methods to generate", props2);

        doc.addExtraClassProperties (panel1);
        doc.addChangeListener (this);
    }

    ~ClassPropertiesPanel() override
    {
        document.removeChangeListener (this);
    }

    void resized() override
    {
        int pw = jmin (getWidth() / 2 - 20, 350);
        panel1.setBounds (10, 6, pw, getHeight() - 12);
        panel2.setBounds (panel1.getRight() + 20, panel1.getY(), pw, panel1.getHeight());
    }

    void paint (Graphics& g) override
    {
        g.fillAll (findColour (secondaryBackgroundColourId));
    }

    void changeListenerCallback (ChangeBroadcaster*) override
    {
        panel1.refreshAll();
        panel2.refreshAll();
    }

private:
    JucerDocument& document;
    PropertyPanel panel1, panel2;

    //==============================================================================
    class ComponentClassNameProperty    : public ComponentTextProperty <Component>
    {
    public:
        explicit ComponentClassNameProperty (JucerDocument& doc)
            : ComponentTextProperty<Component> ("Class name", 128, false, nullptr, doc)
        {}

        void setText (const String& newText) override    { document.setClassName (newText); }
        String getText() const override                  { return document.getClassName(); }
    };

    //==============================================================================
    class ComponentCompNameProperty    : public ComponentTextProperty <Component>
    {
    public:
        explicit ComponentCompNameProperty (JucerDocument& doc)
            : ComponentTextProperty<Component> ("Component name", 200, false, nullptr, doc)
        {}

        void setText (const String& newText) override    { document.setComponentName (newText); }
        String getText() const override                  { return document.getComponentName(); }
    };

    //==============================================================================
    class ComponentParentClassesProperty    : public ComponentTextProperty <Component>
    {
    public:
        explicit ComponentParentClassesProperty (JucerDocument& doc)
            : ComponentTextProperty<Component> ("Parent classes", 512, false, nullptr, doc)
        {}

        void setText (const String& newText) override    { document.setParentClasses (newText); }
        String getText() const override                  { return document.getParentClassString(); }
    };

    //==============================================================================
    class ComponentConstructorParamsProperty    : public ComponentTextProperty <Component>
    {
    public:
        explicit ComponentConstructorParamsProperty (JucerDocument& doc)
            : ComponentTextProperty<Component> ("Constructor params", 2048, false, nullptr, doc)
        {}

        void setText (const String& newText) override    { document.setConstructorParams (newText); }
        String getText() const override                  { return document.getConstructorParams(); }
    };

    //==============================================================================
    class ComponentInitialisersProperty   : public ComponentTextProperty <Component>
    {
    public:
        explicit ComponentInitialisersProperty (JucerDocument& doc)
            : ComponentTextProperty <Component> ("Member initialisers", 16384, true, nullptr, doc)
        {
            preferredHeight = 24 * 3;
        }

        void setText (const String& newText) override    { document.setVariableInitialisers (newText); }
        String getText() const override                  { return document.getVariableInitialisers(); }
    };


    //==============================================================================
    class ComponentInitialSizeProperty    : public ComponentTextProperty <Component>
    {
    public:
        ComponentInitialSizeProperty (JucerDocument& doc, const bool isWidth_)
            : ComponentTextProperty<Component> (isWidth_ ? "Initial width"
                                                         : "Initial height",
                                     10, false, nullptr, doc),
              isWidth (isWidth_)
        {}

        void setText (const String& newText) override
        {
            if (isWidth)
                document.setInitialSize  (newText.getIntValue(), document.getInitialHeight());
            else
                document.setInitialSize  (document.getInitialWidth(), newText.getIntValue());
        }

        String getText() const override
        {
            return String (isWidth ? document.getInitialWidth()
                                   : document.getInitialHeight());
        }

    private:
        const bool isWidth;
    };

    //==============================================================================
    class FixedSizeProperty    : public ComponentChoiceProperty <Component>
    {
    public:
        explicit FixedSizeProperty (JucerDocument& doc)
            : ComponentChoiceProperty<Component> ("Fixed size", nullptr, doc)
        {
            choices.add ("Resize component to fit workspace");
            choices.add ("Keep component size fixed");
        }

        void setIndex (int newIndex)        { document.setFixedSize (newIndex != 0); }
        int getIndex() const                { return document.isFixedSize() ? 1 : 0; }
    };

    //==============================================================================
    class TemplateFileProperty    : public ComponentTextProperty <Component>
    {
    public:
        explicit TemplateFileProperty (JucerDocument& doc)
            : ComponentTextProperty<Component> ("Template file", 2048, false, nullptr, doc)
        {}

        void setText (const String& newText) override    { document.setTemplateFile (newText); }
        String getText() const override                  { return document.getTemplateFile(); }
    };
};

static const Colour tabColour (Colour (0xff888888));

static SourceCodeEditor* createCodeEditor (const File& file, SourceCodeDocument& sourceCodeDoc)
{
    return new SourceCodeEditor (&sourceCodeDoc,
                                 new CppCodeEditorComponent (file, sourceCodeDoc.getCodeDocument()));
}

//==============================================================================
JucerDocumentEditor::JucerDocumentEditor (JucerDocument* const doc)
    : document (doc),
      tabbedComponent (doc)
{
    setOpaque (true);

    if (document != nullptr)
    {
        setSize (document->getInitialWidth(),
                 document->getInitialHeight());

        addAndMakeVisible (tabbedComponent);
        tabbedComponent.setOutline (0);

        tabbedComponent.addTab ("Class", tabColour, new ClassPropertiesPanel (*document), true);

        if (document->getComponentLayout() != nullptr)
            tabbedComponent.addTab ("Subcomponents", tabColour,
                                    compLayoutPanel = new ComponentLayoutPanel (*document, *document->getComponentLayout()), true);

        tabbedComponent.addTab ("Resources", tabColour, new ResourceEditorPanel (*document), true);

        tabbedComponent.addTab ("Code", tabColour, createCodeEditor (document->getCppFile(),
                                                                     document->getCppDocument()), true);

        updateTabs();
        restoreLastSelectedTab();

        document->addChangeListener (this);

        resized();
        refreshPropertiesPanel();

        changeListenerCallback (nullptr);
    }
}

JucerDocumentEditor::~JucerDocumentEditor()
{
    saveLastSelectedTab();
    tabbedComponent.clearTabs();
}

void JucerDocumentEditor::refreshPropertiesPanel() const
{
    for (int i = tabbedComponent.getNumTabs(); --i >= 0;)
    {
        if (ComponentLayoutPanel* layoutPanel = dynamic_cast<ComponentLayoutPanel*> (tabbedComponent.getTabContentComponent (i)))
        {
            if (layoutPanel->isVisible())
                layoutPanel->updatePropertiesList();
        }
        else
        {
            if (PaintRoutinePanel* pr = dynamic_cast<PaintRoutinePanel*> (tabbedComponent.getTabContentComponent (i)))
                if (pr->isVisible())
                    pr->updatePropertiesList();
        }
    }
}

void JucerDocumentEditor::updateTabs()
{
    const StringArray paintRoutineNames (document->getPaintRoutineNames());

    for (int i = tabbedComponent.getNumTabs(); --i >= 0;)
    {
        if (dynamic_cast<PaintRoutinePanel*> (tabbedComponent.getTabContentComponent (i)) != nullptr
             && ! paintRoutineNames.contains (tabbedComponent.getTabNames() [i]))
        {
            tabbedComponent.removeTab (i);
        }
    }

    for (int i = 0; i < document->getNumPaintRoutines(); ++i)
    {
        if (! tabbedComponent.getTabNames().contains (paintRoutineNames [i]))
        {
            int index, numPaintRoutinesSeen = 0;
            for (index = 1; index < tabbedComponent.getNumTabs(); ++index)
            {
                if (dynamic_cast<PaintRoutinePanel*> (tabbedComponent.getTabContentComponent (index)) != nullptr)
                {
                    if (++numPaintRoutinesSeen == i)
                    {
                        ++index;
                        break;
                    }
                }
            }

            if (numPaintRoutinesSeen == 0)
                index = document->getComponentLayout() != nullptr ? 2 : 1;

            tabbedComponent.addTab (paintRoutineNames[i], tabColour,
                                    new PaintRoutinePanel (*document,
                                                           *document->getPaintRoutine (i),
                                                           this), true, index);
        }
    }
}

//==============================================================================
void JucerDocumentEditor::paint (Graphics& g)
{
    g.fillAll (findColour (backgroundColourId));
}

void JucerDocumentEditor::resized()
{
    tabbedComponent.setBounds (getLocalBounds().withTrimmedLeft (12));
}

void JucerDocumentEditor::changeListenerCallback (ChangeBroadcaster*)
{
    setName (document->getClassName());
    updateTabs();
}

//==============================================================================
ApplicationCommandTarget* JucerDocumentEditor::getNextCommandTarget()
{
    return findFirstTargetParentComponent();
}

ComponentLayout* JucerDocumentEditor::getCurrentLayout() const
{
    if (ComponentLayoutPanel* panel = dynamic_cast<ComponentLayoutPanel*> (tabbedComponent.getCurrentContentComponent()))
        return &(panel->layout);

    return nullptr;
}

PaintRoutine* JucerDocumentEditor::getCurrentPaintRoutine() const
{
    if (PaintRoutinePanel* panel = dynamic_cast<PaintRoutinePanel*> (tabbedComponent.getCurrentContentComponent()))
        return &(panel->getPaintRoutine());

    return nullptr;
}

void JucerDocumentEditor::showLayout()
{
    if (getCurrentLayout() == nullptr)
    {
        for (int i = 0; i < tabbedComponent.getNumTabs(); ++i)
        {
            if (dynamic_cast<ComponentLayoutPanel*> (tabbedComponent.getTabContentComponent (i)) != nullptr)
            {
                tabbedComponent.setCurrentTabIndex (i);
                break;
            }
        }
    }
}

void JucerDocumentEditor::showGraphics (PaintRoutine* routine)
{
    if (getCurrentPaintRoutine() != routine || routine == nullptr)
    {
        for (int i = 0; i < tabbedComponent.getNumTabs(); ++i)
        {
            if (auto pr = dynamic_cast<PaintRoutinePanel*> (tabbedComponent.getTabContentComponent (i)))
            {
                if (routine == &(pr->getPaintRoutine()) || routine == nullptr)
                {
                    tabbedComponent.setCurrentTabIndex (i);
                    break;
                }
            }
        }
    }
}

//==============================================================================
void JucerDocumentEditor::setViewportToLastPos (Viewport* vp, EditingPanelBase& editor)
{
    vp->setViewPosition (lastViewportX, lastViewportY);
    editor.setZoom (currentZoomLevel);
}

void JucerDocumentEditor::storeLastViewportPos (Viewport* vp, EditingPanelBase& editor)
{
    lastViewportX = vp->getViewPositionX();
    lastViewportY = vp->getViewPositionY();

    currentZoomLevel = editor.getZoom();
}

void JucerDocumentEditor::setZoom (double scale)
{
    scale = jlimit (1.0 / 4.0, 32.0, scale);

    if (EditingPanelBase* panel = dynamic_cast<EditingPanelBase*> (tabbedComponent.getCurrentContentComponent()))
        panel->setZoom (scale);
}

double JucerDocumentEditor::getZoom() const
{
    if (EditingPanelBase* panel = dynamic_cast<EditingPanelBase*> (tabbedComponent.getCurrentContentComponent()))
        return panel->getZoom();

    return 1.0;
}

static double snapToIntegerZoom (double zoom)
{
    if (zoom >= 1.0)
        return (double) (int) (zoom + 0.5);

    return 1.0 / (int) (1.0 / zoom + 0.5);
}

void JucerDocumentEditor::addElement (const int index)
{
    if (PaintRoutinePanel* const panel = dynamic_cast<PaintRoutinePanel*> (tabbedComponent.getCurrentContentComponent()))
    {
        PaintRoutine* const currentPaintRoutine = & (panel->getPaintRoutine());
        const Rectangle<int> area (panel->getComponentArea());

        document->beginTransaction();

        PaintElement* e = ObjectTypes::createNewElement (index, currentPaintRoutine);

        e->setInitialBounds (area.getWidth(), area.getHeight());

        e = currentPaintRoutine->addNewElement (e, -1, true);

        if (e != nullptr)
        {
            const int randomness = jmin (80, area.getWidth() / 2, area.getHeight() / 2);
            int x = area.getX() + area.getWidth() / 2 + Random::getSystemRandom().nextInt (randomness) - randomness / 2;
            int y = area.getY() + area.getHeight() / 2 + Random::getSystemRandom().nextInt (randomness) - randomness / 2;
            x = document->snapPosition (x);
            y = document->snapPosition (y);

            panel->xyToTargetXY (x, y);

            Rectangle<int> r (e->getCurrentBounds (area));
            r.setPosition (x, y);
            e->setCurrentBounds (r, area, true);

            currentPaintRoutine->getSelectedElements().selectOnly (e);
        }

        document->beginTransaction();
    }
}

void JucerDocumentEditor::addComponent (const int index)
{
    showLayout();

    if (ComponentLayoutPanel* const panel = dynamic_cast<ComponentLayoutPanel*> (tabbedComponent.getCurrentContentComponent()))
    {
        const Rectangle<int> area (panel->getComponentArea());

        document->beginTransaction ("Add new " + ObjectTypes::componentTypeHandlers [index]->getTypeName());

        const int randomness = jmin (80, area.getWidth() / 2, area.getHeight() / 2);
        int x = area.getWidth() / 2 + Random::getSystemRandom().nextInt (randomness) - randomness / 2;
        int y = area.getHeight() / 2 + Random::getSystemRandom().nextInt (randomness) - randomness / 2;
        x = document->snapPosition (x);
        y = document->snapPosition (y);

        panel->xyToTargetXY (x, y);

        if (Component* newOne = panel->layout.addNewComponent (ObjectTypes::componentTypeHandlers [index], x, y))
            panel->layout.getSelectedSet().selectOnly (newOne);

        document->beginTransaction();
    }
}
//==============================================================================
void JucerDocumentEditor::saveLastSelectedTab() const
{
    if (document != nullptr)
    {
        if (auto* project = document->getCppDocument().getProject())
        {
            auto& projectProps = project->getStoredProperties();

            auto root = projectProps.getXmlValue ("GUIComponentsLastTab");

            if (root == nullptr)
                root.reset (new XmlElement ("FILES"));

            auto fileName = document->getCppFile().getFileName();

            auto* child = root->getChildByName (fileName);

            if (child == nullptr)
                child = root->createNewChildElement (fileName);

            child->setAttribute ("tab", tabbedComponent.getCurrentTabIndex());

            projectProps.setValue ("GUIComponentsLastTab", root.get());
        }
    }
}

void JucerDocumentEditor::restoreLastSelectedTab()
{
    if (document != nullptr)
        if (auto* project = document->getCppDocument().getProject())
            if (auto root = project->getStoredProperties().getXmlValue ("GUIComponentsLastTab"))
                if (auto child = root->getChildByName (document->getCppFile().getFileName()))
                    tabbedComponent.setCurrentTabIndex (child->getIntAttribute ("tab"));
}

//==============================================================================
bool JucerDocumentEditor::isSomethingSelected() const
{
    if (auto* layout = getCurrentLayout())
        return layout->getSelectedSet().getNumSelected() > 0;

    if (auto* routine = getCurrentPaintRoutine())
        return routine->getSelectedElements().getNumSelected() > 0;

    return false;
}

bool JucerDocumentEditor::areMultipleThingsSelected() const
{
    if (auto* layout = getCurrentLayout())
        return layout->getSelectedSet().getNumSelected() > 1;

    if (auto* routine = getCurrentPaintRoutine())
        return routine->getSelectedElements().getNumSelected() > 1;

    return false;
}

//==============================================================================
void JucerDocumentEditor::getAllCommands (Array <CommandID>& commands)
{
    const CommandID ids[] =
    {
        JucerCommandIDs::test,
        JucerCommandIDs::toFront,
        JucerCommandIDs::toBack,
        JucerCommandIDs::group,
        JucerCommandIDs::ungroup,
        JucerCommandIDs::bringBackLostItems,
        JucerCommandIDs::enableSnapToGrid,
        JucerCommandIDs::showGrid,
        JucerCommandIDs::editCompLayout,
        JucerCommandIDs::editCompGraphics,
        JucerCommandIDs::zoomIn,
        JucerCommandIDs::zoomOut,
        JucerCommandIDs::zoomNormal,
        JucerCommandIDs::spaceBarDrag,
        JucerCommandIDs::compOverlay0,
        JucerCommandIDs::compOverlay33,
        JucerCommandIDs::compOverlay66,
        JucerCommandIDs::compOverlay100,
        JucerCommandIDs::alignTop,
        JucerCommandIDs::alignRight,
        JucerCommandIDs::alignBottom,
        JucerCommandIDs::alignLeft,
        StandardApplicationCommandIDs::undo,
        StandardApplicationCommandIDs::redo,
        StandardApplicationCommandIDs::cut,
        StandardApplicationCommandIDs::copy,
        StandardApplicationCommandIDs::paste,
        StandardApplicationCommandIDs::del,
        StandardApplicationCommandIDs::selectAll,
        StandardApplicationCommandIDs::deselectAll
    };

    commands.addArray (ids, numElementsInArray (ids));

    for (int i = 0; i < ObjectTypes::numComponentTypes; ++i)
        commands.add (JucerCommandIDs::newComponentBase + i);

    for (int i = 0; i < ObjectTypes::numElementTypes; ++i)
        commands.add (JucerCommandIDs::newElementBase + i);
}

void JucerDocumentEditor::getCommandInfo (const CommandID commandID, ApplicationCommandInfo& result)
{
    ComponentLayout* const currentLayout = getCurrentLayout();
    PaintRoutine* const currentPaintRoutine = getCurrentPaintRoutine();

    const int cmd = ModifierKeys::commandModifier;
    const int shift = ModifierKeys::shiftModifier;

    if (commandID >= JucerCommandIDs::newComponentBase
         && commandID < JucerCommandIDs::newComponentBase + ObjectTypes::numComponentTypes)
    {
        const int index = commandID - JucerCommandIDs::newComponentBase;

        result.setInfo ("New " + ObjectTypes::componentTypeHandlers [index]->getTypeName(),
                        "Creates a new " + ObjectTypes::componentTypeHandlers [index]->getTypeName(),
                        CommandCategories::editing, 0);
        return;
    }

    if (commandID >= JucerCommandIDs::newElementBase
         && commandID < JucerCommandIDs::newElementBase + ObjectTypes::numElementTypes)
    {
        const int index = commandID - JucerCommandIDs::newElementBase;

        result.setInfo (String ("New ") + ObjectTypes::elementTypeNames [index],
                        String ("Adds a new ") + ObjectTypes::elementTypeNames [index],
                        CommandCategories::editing, 0);

        result.setActive (currentPaintRoutine != nullptr);
        return;
    }

    switch (commandID)
    {
    case JucerCommandIDs::toFront:
        result.setInfo (TRANS("Bring to front"), TRANS("Brings the currently selected component to the front."), CommandCategories::editing, 0);
        result.setActive (isSomethingSelected());
        result.defaultKeypresses.add (KeyPress ('f', cmd, 0));
        break;

    case JucerCommandIDs::toBack:
        result.setInfo (TRANS("Send to back"), TRANS("Sends the currently selected component to the back."), CommandCategories::editing, 0);
        result.setActive (isSomethingSelected());
        result.defaultKeypresses.add (KeyPress ('b', cmd, 0));
        break;

    case JucerCommandIDs::group:
        result.setInfo (TRANS("Group selected items"), TRANS("Turns the currently selected elements into a single group object."), CommandCategories::editing, 0);
        result.setActive (currentPaintRoutine != nullptr && currentPaintRoutine->getSelectedElements().getNumSelected() > 1);
        result.defaultKeypresses.add (KeyPress ('k', cmd, 0));
        break;

    case JucerCommandIDs::ungroup:
        result.setInfo (TRANS("Ungroup selected items"), TRANS("Turns the currently selected elements into a single group object."), CommandCategories::editing, 0);
        result.setActive (currentPaintRoutine != nullptr
                           && currentPaintRoutine->getSelectedElements().getNumSelected() == 1
                           && currentPaintRoutine->getSelectedElements().getSelectedItem (0)->getTypeName() == "Group");
        result.defaultKeypresses.add (KeyPress ('k', cmd | shift, 0));
        break;

    case JucerCommandIDs::test:
        result.setInfo (TRANS("Test component..."), TRANS("Runs the current component interactively."), CommandCategories::view, 0);
        result.defaultKeypresses.add (KeyPress ('t', cmd, 0));
        break;

    case JucerCommandIDs::enableSnapToGrid:
        result.setInfo (TRANS("Enable snap-to-grid"), TRANS("Toggles whether components' positions are aligned to a grid."), CommandCategories::view, 0);
        result.setTicked (document != nullptr && document->isSnapActive (false));
        result.defaultKeypresses.add (KeyPress ('g', cmd, 0));
        break;

    case JucerCommandIDs::showGrid:
        result.setInfo (TRANS("Show snap-to-grid"), TRANS("Toggles whether the snapping grid is displayed on-screen."), CommandCategories::view, 0);
        result.setTicked (document != nullptr && document->isSnapShown());
        result.defaultKeypresses.add (KeyPress ('g', cmd | shift, 0));
        break;

    case JucerCommandIDs::editCompLayout:
        result.setInfo (TRANS("Edit sub-component layout"), TRANS("Switches to the sub-component editor view."), CommandCategories::view, 0);
        result.setTicked (currentLayout != nullptr);
        result.defaultKeypresses.add (KeyPress ('n', cmd, 0));
        break;

    case JucerCommandIDs::editCompGraphics:
        result.setInfo (TRANS("Edit background graphics"), TRANS("Switches to the background graphics editor view."), CommandCategories::view, 0);
        result.setTicked (currentPaintRoutine != nullptr);
        result.defaultKeypresses.add (KeyPress ('m', cmd, 0));
        break;

    case JucerCommandIDs::bringBackLostItems:
        result.setInfo (TRANS("Retrieve offscreen items"), TRANS("Moves any items that are lost beyond the edges of the screen back to the centre."), CommandCategories::editing, 0);
        result.setActive (currentPaintRoutine != nullptr || currentLayout != nullptr);
        result.defaultKeypresses.add (KeyPress ('m', cmd, 0));
        break;

    case JucerCommandIDs::zoomIn:
        result.setInfo (TRANS("Zoom in"), TRANS("Zooms in on the current component."), CommandCategories::editing, 0);
        result.setActive (currentPaintRoutine != nullptr || currentLayout != nullptr);
        result.defaultKeypresses.add (KeyPress (']', cmd, 0));
        break;

    case JucerCommandIDs::zoomOut:
        result.setInfo (TRANS("Zoom out"), TRANS("Zooms out on the current component."), CommandCategories::editing, 0);
        result.setActive (currentPaintRoutine != nullptr || currentLayout != nullptr);
        result.defaultKeypresses.add (KeyPress ('[', cmd, 0));
        break;

    case JucerCommandIDs::zoomNormal:
        result.setInfo (TRANS("Zoom to 100%"), TRANS("Restores the zoom level to normal."), CommandCategories::editing, 0);
        result.setActive (currentPaintRoutine != nullptr || currentLayout != nullptr);
        result.defaultKeypresses.add (KeyPress ('1', cmd, 0));
        break;

    case JucerCommandIDs::spaceBarDrag:
        result.setInfo (TRANS("Scroll while dragging mouse"), TRANS("When held down, this key lets you scroll around by dragging with the mouse."),
                        CommandCategories::view, ApplicationCommandInfo::wantsKeyUpDownCallbacks);
        result.setActive (currentPaintRoutine != nullptr || currentLayout != nullptr);
        result.defaultKeypresses.add (KeyPress (KeyPress::spaceKey, 0, 0));
        break;

    case JucerCommandIDs::compOverlay0:
    case JucerCommandIDs::compOverlay33:
    case JucerCommandIDs::compOverlay66:
    case JucerCommandIDs::compOverlay100:
        {
            int amount = 0, num = 0;

            if (commandID == JucerCommandIDs::compOverlay33)
            {
                amount = 33;
                num = 1;
            }
            else if (commandID == JucerCommandIDs::compOverlay66)
            {
                amount = 66;
                num = 2;
            }
            else if (commandID == JucerCommandIDs::compOverlay100)
            {
                amount = 100;
                num = 3;
            }

            result.defaultKeypresses.add (KeyPress ('2' + num, cmd, 0));

            int currentAmount = 0;
            if (document != nullptr && document->getComponentOverlayOpacity() > 0.9f)
                currentAmount = 100;
            else if (document != nullptr && document->getComponentOverlayOpacity() > 0.6f)
                currentAmount = 66;
            else if (document != nullptr && document->getComponentOverlayOpacity() > 0.3f)
                currentAmount = 33;

            result.setInfo (commandID == JucerCommandIDs::compOverlay0
                                ? TRANS("No component overlay")
                                : TRANS("Overlay with opacity of 123%").replace ("123", String (amount)),
                            TRANS("Changes the opacity of the components that are shown over the top of the graphics editor."),
                            CommandCategories::view, 0);
            result.setActive (currentPaintRoutine != nullptr && document->getComponentLayout() != nullptr);
            result.setTicked (amount == currentAmount);
        }
        break;

    case JucerCommandIDs::alignTop:
            result.setInfo (TRANS ("Align top"),
                            TRANS ("Aligns the top edges of all selected components to the first component that was selected."),
                            CommandCategories::editing, 0);
            result.setActive (areMultipleThingsSelected());
        break;

    case JucerCommandIDs::alignRight:
            result.setInfo (TRANS ("Align right"),
                            TRANS ("Aligns the right edges of all selected components to the first component that was selected."),
                            CommandCategories::editing, 0);
            result.setActive (areMultipleThingsSelected());
        break;

    case JucerCommandIDs::alignBottom:
            result.setInfo (TRANS ("Align bottom"),
                            TRANS ("Aligns the bottom edges of all selected components to the first component that was selected."),
                            CommandCategories::editing, 0);
            result.setActive (areMultipleThingsSelected());
        break;

    case JucerCommandIDs::alignLeft:
            result.setInfo (TRANS ("Align left"),
                            TRANS ("Aligns the left edges of all selected components to the first component that was selected."),
                            CommandCategories::editing, 0);
            result.setActive (areMultipleThingsSelected());
        break;

    case StandardApplicationCommandIDs::undo:
        result.setInfo (TRANS ("Undo"), TRANS ("Undo"), "Editing", 0);
        result.setActive (document != nullptr && document->getUndoManager().canUndo());
        result.defaultKeypresses.add (KeyPress ('z', cmd, 0));
        break;

    case StandardApplicationCommandIDs::redo:
        result.setInfo (TRANS ("Redo"), TRANS ("Redo"), "Editing", 0);
        result.setActive (document != nullptr && document->getUndoManager().canRedo());
        result.defaultKeypresses.add (KeyPress ('z', cmd | shift, 0));
        break;

    case StandardApplicationCommandIDs::cut:
        result.setInfo (TRANS ("Cut"), String(), "Editing", 0);
        result.setActive (isSomethingSelected());
        result.defaultKeypresses.add (KeyPress ('x', cmd, 0));
        break;

    case StandardApplicationCommandIDs::copy:
        result.setInfo (TRANS ("Copy"), String(), "Editing", 0);
        result.setActive (isSomethingSelected());
        result.defaultKeypresses.add (KeyPress ('c', cmd, 0));
        break;

    case StandardApplicationCommandIDs::paste:
        {
            result.setInfo (TRANS ("Paste"), String(), "Editing", 0);
            result.defaultKeypresses.add (KeyPress ('v', cmd, 0));

            bool canPaste = false;

            if (auto doc = parseXML (SystemClipboard::getTextFromClipboard()))
            {
                if (doc->hasTagName (ComponentLayout::clipboardXmlTag))
                    canPaste = (currentLayout != nullptr);
                else if (doc->hasTagName (PaintRoutine::clipboardXmlTag))
                    canPaste = (currentPaintRoutine != nullptr);
            }

            result.setActive (canPaste);
        }

        break;

    case StandardApplicationCommandIDs::del:
        result.setInfo (TRANS ("Delete"), String(), "Editing", 0);
        result.setActive (isSomethingSelected());
        break;

    case StandardApplicationCommandIDs::selectAll:
        result.setInfo (TRANS ("Select All"), String(), "Editing", 0);
        result.setActive (currentPaintRoutine != nullptr || currentLayout != nullptr);
        result.defaultKeypresses.add (KeyPress ('a', cmd, 0));
        break;

    case StandardApplicationCommandIDs::deselectAll:
        result.setInfo (TRANS ("Deselect All"), String(), "Editing", 0);
        result.setActive (currentPaintRoutine != nullptr || currentLayout != nullptr);
        result.defaultKeypresses.add (KeyPress ('d', cmd, 0));
        break;

    default:
        break;
    }
}

bool JucerDocumentEditor::perform (const InvocationInfo& info)
{
    ComponentLayout* const currentLayout = getCurrentLayout();
    PaintRoutine* const currentPaintRoutine = getCurrentPaintRoutine();

    document->beginTransaction();

    if (info.commandID >= JucerCommandIDs::newComponentBase
         && info.commandID < JucerCommandIDs::newComponentBase + ObjectTypes::numComponentTypes)
    {
        addComponent (info.commandID - JucerCommandIDs::newComponentBase);
        return true;
    }

    if (info.commandID >= JucerCommandIDs::newElementBase
         && info.commandID < JucerCommandIDs::newElementBase + ObjectTypes::numElementTypes)
    {
        addElement (info.commandID - JucerCommandIDs::newElementBase);
        return true;
    }

    switch (info.commandID)
    {
        case StandardApplicationCommandIDs::undo:
            document->getUndoManager().undo();
            document->dispatchPendingMessages();
            break;

        case StandardApplicationCommandIDs::redo:
            document->getUndoManager().redo();
            document->dispatchPendingMessages();
            break;

        case JucerCommandIDs::test:
            TestComponent::showInDialogBox (*document);
            break;

        case JucerCommandIDs::enableSnapToGrid:
            document->setSnappingGrid (document->getSnappingGridSize(),
                                       ! document->isSnapActive (false),
                                       document->isSnapShown());
            break;

        case JucerCommandIDs::showGrid:
            document->setSnappingGrid (document->getSnappingGridSize(),
                                       document->isSnapActive (false),
                                       ! document->isSnapShown());
            break;

        case JucerCommandIDs::editCompLayout:
            showLayout();
            break;

        case JucerCommandIDs::editCompGraphics:
            showGraphics (nullptr);
            break;

        case JucerCommandIDs::zoomIn:      setZoom (snapToIntegerZoom (getZoom() * 2.0)); break;
        case JucerCommandIDs::zoomOut:     setZoom (snapToIntegerZoom (getZoom() / 2.0)); break;
        case JucerCommandIDs::zoomNormal:  setZoom (1.0); break;

        case JucerCommandIDs::spaceBarDrag:
            if (EditingPanelBase* panel = dynamic_cast<EditingPanelBase*> (tabbedComponent.getCurrentContentComponent()))
                panel->dragKeyHeldDown (info.isKeyDown);

            break;

        case JucerCommandIDs::compOverlay0:
        case JucerCommandIDs::compOverlay33:
        case JucerCommandIDs::compOverlay66:
        case JucerCommandIDs::compOverlay100:
            {
                int amount = 0;

                if (info.commandID == JucerCommandIDs::compOverlay33)
                    amount = 33;
                else if (info.commandID == JucerCommandIDs::compOverlay66)
                    amount = 66;
                else if (info.commandID == JucerCommandIDs::compOverlay100)
                    amount = 100;

                document->setComponentOverlayOpacity (amount * 0.01f);
            }
            break;

        case JucerCommandIDs::bringBackLostItems:
            if (EditingPanelBase* panel = dynamic_cast<EditingPanelBase*> (tabbedComponent.getCurrentContentComponent()))
            {
                int w = panel->getComponentArea().getWidth();
                int h = panel->getComponentArea().getHeight();

                if (currentPaintRoutine != nullptr)
                    currentPaintRoutine->bringLostItemsBackOnScreen (panel->getComponentArea());
                else if (currentLayout != nullptr)
                    currentLayout->bringLostItemsBackOnScreen (w, h);
            }

            break;

        case JucerCommandIDs::toFront:
            if (currentLayout != nullptr)
                currentLayout->selectedToFront();
            else if (currentPaintRoutine != nullptr)
                currentPaintRoutine->selectedToFront();

            break;

        case JucerCommandIDs::toBack:
            if (currentLayout != nullptr)
                currentLayout->selectedToBack();
            else if (currentPaintRoutine != nullptr)
                currentPaintRoutine->selectedToBack();

            break;

        case JucerCommandIDs::group:
            if (currentPaintRoutine != nullptr)
                currentPaintRoutine->groupSelected();
            break;

        case JucerCommandIDs::ungroup:
            if (currentPaintRoutine != nullptr)
                currentPaintRoutine->ungroupSelected();
            break;

        case JucerCommandIDs::alignTop:
            if (currentLayout != nullptr)
                currentLayout->alignTop();
            else if (currentPaintRoutine != nullptr)
                currentPaintRoutine->alignTop();

            break;

        case JucerCommandIDs::alignRight:
            if (currentLayout != nullptr)
                currentLayout->alignRight();
            else if (currentPaintRoutine != nullptr)
                currentPaintRoutine->alignRight();

            break;

        case JucerCommandIDs::alignBottom:
            if (currentLayout != nullptr)
                currentLayout->alignBottom();
            else if (currentPaintRoutine != nullptr)
                currentPaintRoutine->alignBottom();

            break;

        case JucerCommandIDs::alignLeft:
            if (currentLayout != nullptr)
                currentLayout->alignLeft();
            else if (currentPaintRoutine != nullptr)
                currentPaintRoutine->alignLeft();

            break;

        case StandardApplicationCommandIDs::cut:
            if (currentLayout != nullptr)
            {
                currentLayout->copySelectedToClipboard();
                currentLayout->deleteSelected();
            }
            else if (currentPaintRoutine != nullptr)
            {
                currentPaintRoutine->copySelectedToClipboard();
                currentPaintRoutine->deleteSelected();
            }

            break;

        case StandardApplicationCommandIDs::copy:
            if (currentLayout != nullptr)
                currentLayout->copySelectedToClipboard();
            else if (currentPaintRoutine != nullptr)
                currentPaintRoutine->copySelectedToClipboard();

            break;

        case StandardApplicationCommandIDs::paste:
            {
                if (auto doc = parseXML (SystemClipboard::getTextFromClipboard()))
                {
                    if (doc->hasTagName (ComponentLayout::clipboardXmlTag))
                    {
                        if (currentLayout != nullptr)
                            currentLayout->paste();
                    }
                    else if (doc->hasTagName (PaintRoutine::clipboardXmlTag))
                    {
                        if (currentPaintRoutine != nullptr)
                            currentPaintRoutine->paste();
                    }
                }
            }
            break;

        case StandardApplicationCommandIDs::del:
            if (currentLayout != nullptr)
                currentLayout->deleteSelected();
            else if (currentPaintRoutine != nullptr)
                currentPaintRoutine->deleteSelected();
            break;

        case StandardApplicationCommandIDs::selectAll:
            if (currentLayout != nullptr)
                currentLayout->selectAll();
            else if (currentPaintRoutine != nullptr)
                currentPaintRoutine->selectAll();
            break;

        case StandardApplicationCommandIDs::deselectAll:
            if (currentLayout != nullptr)
            {
                currentLayout->getSelectedSet().deselectAll();
            }
            else if (currentPaintRoutine != nullptr)
            {
                currentPaintRoutine->getSelectedElements().deselectAll();
                currentPaintRoutine->getSelectedPoints().deselectAll();
            }

            break;

        default:
            return false;
    }

    document->beginTransaction();
    return true;
}

bool JucerDocumentEditor::keyPressed (const KeyPress& key)
{
    if (key.isKeyCode (KeyPress::deleteKey) || key.isKeyCode (KeyPress::backspaceKey))
    {
        ProjucerApplication::getCommandManager().invokeDirectly (StandardApplicationCommandIDs::del, true);
        return true;
    }

    return false;
}

JucerDocumentEditor* JucerDocumentEditor::getActiveDocumentHolder()
{
    ApplicationCommandInfo info (0);
    return dynamic_cast<JucerDocumentEditor*> (ProjucerApplication::getCommandManager()
                                                  .getTargetForCommand (JucerCommandIDs::editCompLayout, info));
}

Image JucerDocumentEditor::createComponentLayerSnapshot() const
{
    if (compLayoutPanel != nullptr)
        return compLayoutPanel->createComponentSnapshot();

    return {};
}

const int gridSnapMenuItemBase = 0x8723620;
const int snapSizes[] = { 2, 3, 4, 5, 6, 8, 10, 12, 16, 20, 24, 32 };

PopupMenu createGUIEditorMenu()
{
    PopupMenu menu;
    auto* commandManager = &ProjucerApplication::getCommandManager();

    menu.addCommandItem (commandManager, CommandIDs::addNewGUIFile);
    menu.addSeparator();

    menu.addCommandItem (commandManager, JucerCommandIDs::editCompLayout);
    menu.addCommandItem (commandManager, JucerCommandIDs::editCompGraphics);
    menu.addSeparator();

    PopupMenu newComps;
    for (int i = 0; i < ObjectTypes::numComponentTypes; ++i)
        newComps.addCommandItem (commandManager, JucerCommandIDs::newComponentBase + i);

    menu.addSubMenu ("Add new component", newComps);

    PopupMenu newElements;
    for (int i = 0; i < ObjectTypes::numElementTypes; ++i)
        newElements.addCommandItem (commandManager, JucerCommandIDs::newElementBase + i);

    menu.addSubMenu ("Add new graphic element", newElements);

    menu.addSeparator();
    menu.addCommandItem (commandManager, StandardApplicationCommandIDs::cut);
    menu.addCommandItem (commandManager, StandardApplicationCommandIDs::copy);
    menu.addCommandItem (commandManager, StandardApplicationCommandIDs::paste);
    menu.addCommandItem (commandManager, StandardApplicationCommandIDs::del);
    menu.addCommandItem (commandManager, StandardApplicationCommandIDs::selectAll);
    menu.addCommandItem (commandManager, StandardApplicationCommandIDs::deselectAll);
    menu.addSeparator();
    menu.addCommandItem (commandManager, JucerCommandIDs::toFront);
    menu.addCommandItem (commandManager, JucerCommandIDs::toBack);
    menu.addSeparator();
    menu.addCommandItem (commandManager, JucerCommandIDs::group);
    menu.addCommandItem (commandManager, JucerCommandIDs::ungroup);
    menu.addSeparator();
    menu.addCommandItem (commandManager, JucerCommandIDs::bringBackLostItems);

    menu.addSeparator();
    menu.addCommandItem (commandManager, JucerCommandIDs::showGrid);
    menu.addCommandItem (commandManager, JucerCommandIDs::enableSnapToGrid);

    auto* holder = JucerDocumentEditor::getActiveDocumentHolder();

    {
        auto currentSnapSize = holder != nullptr ? holder->getDocument()->getSnappingGridSize() : -1;
        PopupMenu m;

        for (int i = 0; i < numElementsInArray (snapSizes); ++i)
            m.addItem (gridSnapMenuItemBase + i, String (snapSizes[i]) + " pixels",
                       true, snapSizes[i] == currentSnapSize);

        menu.addSubMenu ("Grid size", m, currentSnapSize >= 0);
    }

    menu.addSeparator();
    menu.addCommandItem (commandManager, JucerCommandIDs::zoomIn);
    menu.addCommandItem (commandManager, JucerCommandIDs::zoomOut);
    menu.addCommandItem (commandManager, JucerCommandIDs::zoomNormal);

    menu.addSeparator();
    menu.addCommandItem (commandManager, JucerCommandIDs::test);

    menu.addSeparator();

    {
        PopupMenu overlays;
        overlays.addCommandItem (commandManager, JucerCommandIDs::compOverlay0);
        overlays.addCommandItem (commandManager, JucerCommandIDs::compOverlay33);
        overlays.addCommandItem (commandManager, JucerCommandIDs::compOverlay66);
        overlays.addCommandItem (commandManager, JucerCommandIDs::compOverlay100);

        menu.addSubMenu ("Component Overlay", overlays, holder != nullptr);
    }
    return menu;
}

void handleGUIEditorMenuCommand (int);
void handleGUIEditorMenuCommand (int menuItemID)
{
    if (auto* ed = JucerDocumentEditor::getActiveDocumentHolder())
    {
        int gridIndex = menuItemID - gridSnapMenuItemBase;

        if (isPositiveAndBelow (gridIndex, numElementsInArray (snapSizes)))
        {
            auto& doc = *ed->getDocument();

            doc.setSnappingGrid (snapSizes [gridIndex],
                                 doc.isSnapActive (false),
                                 doc.isSnapShown());
        }
    }
}

void registerGUIEditorCommands();
void registerGUIEditorCommands()
{
    JucerDocumentEditor dh (nullptr);
    ProjucerApplication::getCommandManager().registerAllCommandsForTarget (&dh);
}