/* ============================================================================== This file is part of the JUCE library. Copyright (c) 2022 - Raw Material Software Limited JUCE is an open source library subject to commercial or open-source licensing. By using JUCE, you agree to the terms of both the JUCE 7 End-User License Agreement and JUCE Privacy Policy. End User License Agreement: www.juce.com/juce-7-licence Privacy Policy: www.juce.com/juce-privacy-policy Or: You may also use this code under the terms of the GPL v3 (see www.gnu.org/licenses). JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE DISCLAIMED. ============================================================================== */ #define JUCE_ASSERT_MESSAGE_MANAGER_IS_LOCKED_OR_OFFSCREEN \ jassert ((MessageManager::getInstanceWithoutCreating() != nullptr \ && MessageManager::getInstanceWithoutCreating()->currentThreadHasLockedMessageManager()) \ || getPeer() == nullptr); namespace juce { static Component* findFirstEnabledAncestor (Component* in) { if (in == nullptr) return nullptr; if (in->isEnabled()) return in; return findFirstEnabledAncestor (in->getParentComponent()); } Component* Component::currentlyFocusedComponent = nullptr; //============================================================================== class HierarchyChecker { public: HierarchyChecker (Component* comp, const MouseEvent& originalEvent) : me (originalEvent) { for (; comp != nullptr; comp = comp->getParentComponent()) hierarchy.emplace_back (comp); } Component* nearestNonNullParent() const { for (auto& comp : hierarchy) if (comp != nullptr) return comp; return nullptr; } bool shouldBailOut() const { return nearestNonNullParent() == nullptr; } MouseEvent eventWithNearestParent() const { auto* comp = nearestNonNullParent(); return { me.source, me.position.toFloat(), me.mods, me.pressure, me.orientation, me.rotation, me.tiltX, me.tiltY, comp, comp, me.eventTime, me.mouseDownPosition.toFloat(), me.mouseDownTime, me.getNumberOfClicks(), me.mouseWasDraggedSinceMouseDown() }; } private: std::vector> hierarchy; const MouseEvent me; }; //============================================================================== class Component::MouseListenerList { public: MouseListenerList() noexcept {} void addListener (MouseListener* newListener, bool wantsEventsForAllNestedChildComponents) { if (! listeners.contains (newListener)) { if (wantsEventsForAllNestedChildComponents) { listeners.insert (0, newListener); ++numDeepMouseListeners; } else { listeners.add (newListener); } } } void removeListener (MouseListener* listenerToRemove) { auto index = listeners.indexOf (listenerToRemove); if (index >= 0) { if (index < numDeepMouseListeners) --numDeepMouseListeners; listeners.remove (index); } } template static void sendMouseEvent (HierarchyChecker& checker, EventMethod&& eventMethod, Params&&... params) { const auto callListeners = [&] (auto& parentComp, const auto findNumListeners) { if (auto* list = parentComp.mouseListeners.get()) { const WeakReference safePointer { &parentComp }; for (int i = findNumListeners (*list); --i >= 0; i = jmin (i, findNumListeners (*list))) { (list->listeners.getUnchecked (i)->*eventMethod) (checker.eventWithNearestParent(), params...); if (checker.shouldBailOut() || safePointer == nullptr) return false; } } return true; }; if (auto* parent = checker.nearestNonNullParent()) if (! callListeners (*parent, [] (auto& list) { return list.listeners.size(); })) return; if (auto* parent = checker.nearestNonNullParent()) for (Component* p = parent->parentComponent; p != nullptr; p = p->parentComponent) if (! callListeners (*p, [] (auto& list) { return list.numDeepMouseListeners; })) return; } private: Array listeners; int numDeepMouseListeners = 0; JUCE_DECLARE_NON_COPYABLE (MouseListenerList) }; //============================================================================== Component::Component() noexcept : componentFlags (0) { } Component::Component (const String& name) noexcept : componentName (name), componentFlags (0) { } Component::~Component() { static_assert (sizeof (flags) <= sizeof (componentFlags), "componentFlags has too many bits!"); componentListeners.call ([this] (ComponentListener& l) { l.componentBeingDeleted (*this); }); while (childComponentList.size() > 0) removeChildComponent (childComponentList.size() - 1, false, true); masterReference.clear(); if (parentComponent != nullptr) parentComponent->removeChildComponent (parentComponent->childComponentList.indexOf (this), true, false); else giveAwayKeyboardFocusInternal (isParentOf (currentlyFocusedComponent)); if (flags.hasHeavyweightPeerFlag) removeFromDesktop(); // Something has added some children to this component during its destructor! Not a smart idea! jassert (childComponentList.size() == 0); } //============================================================================== void Component::setName (const String& name) { // if component methods are being called from threads other than the message // thread, you'll need to use a MessageManagerLock object to make sure it's thread-safe. JUCE_ASSERT_MESSAGE_MANAGER_IS_LOCKED_OR_OFFSCREEN if (componentName != name) { componentName = name; if (flags.hasHeavyweightPeerFlag) if (auto* peer = getPeer()) peer->setTitle (name); BailOutChecker checker (this); componentListeners.callChecked (checker, [this] (ComponentListener& l) { l.componentNameChanged (*this); }); } } void Component::setComponentID (const String& newID) { componentID = newID; } void Component::setVisible (bool shouldBeVisible) { if (flags.visibleFlag != shouldBeVisible) { // if component methods are being called from threads other than the message // thread, you'll need to use a MessageManagerLock object to make sure it's thread-safe. JUCE_ASSERT_MESSAGE_MANAGER_IS_LOCKED_OR_OFFSCREEN const WeakReference safePointer (this); flags.visibleFlag = shouldBeVisible; if (shouldBeVisible) repaint(); else repaintParent(); sendFakeMouseMove(); if (! shouldBeVisible) { detail::ComponentHelpers::releaseAllCachedImageResources (*this); if (hasKeyboardFocus (true)) { if (parentComponent != nullptr) parentComponent->grabKeyboardFocus(); // ensure that keyboard focus is given away if it wasn't taken by parent giveAwayKeyboardFocus(); } } if (safePointer != nullptr) { sendVisibilityChangeMessage(); if (safePointer != nullptr && flags.hasHeavyweightPeerFlag) { if (auto* peer = getPeer()) { peer->setVisible (shouldBeVisible); internalHierarchyChanged(); } } } } } void Component::visibilityChanged() {} void Component::sendVisibilityChangeMessage() { BailOutChecker checker (this); visibilityChanged(); if (! checker.shouldBailOut()) componentListeners.callChecked (checker, [this] (ComponentListener& l) { l.componentVisibilityChanged (*this); }); } bool Component::isShowing() const { if (! flags.visibleFlag) return false; if (parentComponent != nullptr) return parentComponent->isShowing(); if (auto* peer = getPeer()) return ! peer->isMinimised(); return false; } //============================================================================== void* Component::getWindowHandle() const { if (auto* peer = getPeer()) return peer->getNativeHandle(); return nullptr; } //============================================================================== void Component::addToDesktop (int styleWanted, void* nativeWindowToAttachTo) { // if component methods are being called from threads other than the message // thread, you'll need to use a MessageManagerLock object to make sure it's thread-safe. JUCE_ASSERT_MESSAGE_MANAGER_IS_LOCKED if (isOpaque()) styleWanted &= ~ComponentPeer::windowIsSemiTransparent; else styleWanted |= ComponentPeer::windowIsSemiTransparent; // don't use getPeer(), so that we only get the peer that's specifically // for this comp, and not for one of its parents. auto* peer = ComponentPeer::getPeerFor (this); if (peer == nullptr || styleWanted != peer->getStyleFlags()) { const WeakReference safePointer (this); #if JUCE_LINUX || JUCE_BSD // it's wise to give the component a non-zero size before // putting it on the desktop, as X windows get confused by this, and // a (1, 1) minimum size is enforced here. setSize (jmax (1, getWidth()), jmax (1, getHeight())); #endif const auto unscaledPosition = detail::ScalingHelpers::scaledScreenPosToUnscaled (getScreenPosition()); const auto topLeft = detail::ScalingHelpers::unscaledScreenPosToScaled (*this, unscaledPosition); bool wasFullscreen = false; bool wasMinimised = false; ComponentBoundsConstrainer* currentConstrainer = nullptr; Rectangle oldNonFullScreenBounds; int oldRenderingEngine = -1; if (peer != nullptr) { std::unique_ptr oldPeerToDelete (peer); wasFullscreen = peer->isFullScreen(); wasMinimised = peer->isMinimised(); currentConstrainer = peer->getConstrainer(); oldNonFullScreenBounds = peer->getNonFullScreenBounds(); oldRenderingEngine = peer->getCurrentRenderingEngine(); flags.hasHeavyweightPeerFlag = false; Desktop::getInstance().removeDesktopComponent (this); internalHierarchyChanged(); // give comps a chance to react to the peer change before the old peer is deleted. if (safePointer == nullptr) return; setTopLeftPosition (topLeft); } if (parentComponent != nullptr) parentComponent->removeChildComponent (this); if (safePointer != nullptr) { flags.hasHeavyweightPeerFlag = true; peer = createNewPeer (styleWanted, nativeWindowToAttachTo); Desktop::getInstance().addDesktopComponent (this); boundsRelativeToParent.setPosition (topLeft); peer->updateBounds(); if (oldRenderingEngine >= 0) peer->setCurrentRenderingEngine (oldRenderingEngine); peer->setVisible (isVisible()); peer = ComponentPeer::getPeerFor (this); if (peer == nullptr) return; if (wasFullscreen) { peer->setFullScreen (true); peer->setNonFullScreenBounds (oldNonFullScreenBounds); } if (wasMinimised) peer->setMinimised (true); #if JUCE_WINDOWS if (isAlwaysOnTop()) peer->setAlwaysOnTop (true); #endif peer->setConstrainer (currentConstrainer); repaint(); #if JUCE_LINUX // Creating the peer Image on Linux will change the reported position of the window. If // the Image creation is interleaved with the coming configureNotifyEvents the window // will appear in the wrong position. To avoid this, we force the Image creation here, // before handling any of the configureNotifyEvents. The Linux implementation of // performAnyPendingRepaintsNow() will force update the peer position if necessary. peer->performAnyPendingRepaintsNow(); #endif internalHierarchyChanged(); if (auto* handler = getAccessibilityHandler()) detail::AccessibilityHelpers::notifyAccessibilityEvent (*handler, detail::AccessibilityHelpers::Event::windowOpened); } } } void Component::removeFromDesktop() { // if component methods are being called from threads other than the message // thread, you'll need to use a MessageManagerLock object to make sure it's thread-safe. JUCE_ASSERT_MESSAGE_MANAGER_IS_LOCKED_OR_OFFSCREEN if (flags.hasHeavyweightPeerFlag) { if (auto* handler = getAccessibilityHandler()) detail::AccessibilityHelpers::notifyAccessibilityEvent (*handler, detail::AccessibilityHelpers::Event::windowClosed); detail::ComponentHelpers::releaseAllCachedImageResources (*this); auto* peer = ComponentPeer::getPeerFor (this); jassert (peer != nullptr); flags.hasHeavyweightPeerFlag = false; delete peer; Desktop::getInstance().removeDesktopComponent (this); } } bool Component::isOnDesktop() const noexcept { return flags.hasHeavyweightPeerFlag; } ComponentPeer* Component::getPeer() const { if (flags.hasHeavyweightPeerFlag) return ComponentPeer::getPeerFor (this); if (parentComponent == nullptr) return nullptr; return parentComponent->getPeer(); } void Component::userTriedToCloseWindow() { /* This means that the user's trying to get rid of your window with the 'close window' system menu option (on windows) or possibly the task manager - you should really handle this and delete or hide your component in an appropriate way. If you want to ignore the event and don't want to trigger this assertion, just override this method and do nothing. */ jassertfalse; } void Component::minimisationStateChanged (bool) {} float Component::getDesktopScaleFactor() const { return Desktop::getInstance().getGlobalScaleFactor(); } //============================================================================== void Component::setOpaque (bool shouldBeOpaque) { if (shouldBeOpaque != flags.opaqueFlag) { flags.opaqueFlag = shouldBeOpaque; if (flags.hasHeavyweightPeerFlag) if (auto* peer = ComponentPeer::getPeerFor (this)) addToDesktop (peer->getStyleFlags()); // recreates the heavyweight window repaint(); } } bool Component::isOpaque() const noexcept { return flags.opaqueFlag; } //============================================================================== struct StandardCachedComponentImage final : public CachedComponentImage { StandardCachedComponentImage (Component& c) noexcept : owner (c) {} void paint (Graphics& g) override { scale = g.getInternalContext().getPhysicalPixelScaleFactor(); auto compBounds = owner.getLocalBounds(); auto imageBounds = compBounds * scale; if (image.isNull() || image.getBounds() != imageBounds) { image = Image (owner.isOpaque() ? Image::RGB : Image::ARGB, jmax (1, imageBounds.getWidth()), jmax (1, imageBounds.getHeight()), ! owner.isOpaque()); validArea.clear(); } if (! validArea.containsRectangle (compBounds)) { Graphics imG (image); auto& lg = imG.getInternalContext(); lg.addTransform (AffineTransform::scale (scale)); for (auto& i : validArea) lg.excludeClipRectangle (i); if (! owner.isOpaque()) { lg.setFill (Colours::transparentBlack); lg.fillRect (compBounds, true); lg.setFill (Colours::black); } owner.paintEntireComponent (imG, true); } validArea = compBounds; g.setColour (Colours::black.withAlpha (owner.getAlpha())); g.drawImageTransformed (image, AffineTransform::scale ((float) compBounds.getWidth() / (float) imageBounds.getWidth(), (float) compBounds.getHeight() / (float) imageBounds.getHeight()), false); } bool invalidateAll() override { validArea.clear(); return true; } bool invalidate (const Rectangle& area) override { validArea.subtract (area); return true; } void releaseResources() override { image = Image(); } private: Image image; RectangleList validArea; Component& owner; float scale = 1.0f; JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (StandardCachedComponentImage) }; void Component::setCachedComponentImage (CachedComponentImage* newCachedImage) { if (cachedImage.get() != newCachedImage) { cachedImage.reset (newCachedImage); repaint(); } } void Component::setBufferedToImage (bool shouldBeBuffered) { // This assertion means that this component is already using a custom CachedComponentImage, // so by calling setBufferedToImage, you'll be deleting the custom one - this is almost certainly // not what you wanted to happen... If you really do know what you're doing here, and want to // avoid this assertion, just call setCachedComponentImage (nullptr) before setBufferedToImage(). jassert (cachedImage == nullptr || dynamic_cast (cachedImage.get()) != nullptr); if (shouldBeBuffered) { if (cachedImage == nullptr) cachedImage.reset (new StandardCachedComponentImage (*this)); } else { cachedImage.reset(); } } //============================================================================== void Component::reorderChildInternal (int sourceIndex, int destIndex) { if (sourceIndex != destIndex) { auto* c = childComponentList.getUnchecked (sourceIndex); jassert (c != nullptr); c->repaintParent(); childComponentList.move (sourceIndex, destIndex); sendFakeMouseMove(); internalChildrenChanged(); } } void Component::toFront (bool shouldGrabKeyboardFocus) { // if component methods are being called from threads other than the message // thread, you'll need to use a MessageManagerLock object to make sure it's thread-safe. JUCE_ASSERT_MESSAGE_MANAGER_IS_LOCKED_OR_OFFSCREEN if (flags.hasHeavyweightPeerFlag) { if (auto* peer = getPeer()) { peer->toFront (shouldGrabKeyboardFocus); if (shouldGrabKeyboardFocus && ! hasKeyboardFocus (true)) grabKeyboardFocus(); } } else if (parentComponent != nullptr) { auto& childList = parentComponent->childComponentList; if (childList.getLast() != this) { auto index = childList.indexOf (this); if (index >= 0) { int insertIndex = -1; if (! flags.alwaysOnTopFlag) { insertIndex = childList.size() - 1; while (insertIndex > 0 && childList.getUnchecked (insertIndex)->isAlwaysOnTop()) --insertIndex; } parentComponent->reorderChildInternal (index, insertIndex); } } if (shouldGrabKeyboardFocus) { internalBroughtToFront(); if (isShowing()) grabKeyboardFocus(); } } } void Component::toBehind (Component* other) { if (other != nullptr && other != this) { // the two components must belong to the same parent.. jassert (parentComponent == other->parentComponent); if (parentComponent != nullptr) { auto& childList = parentComponent->childComponentList; auto index = childList.indexOf (this); if (index >= 0 && childList [index + 1] != other) { auto otherIndex = childList.indexOf (other); if (otherIndex >= 0) { if (index < otherIndex) --otherIndex; parentComponent->reorderChildInternal (index, otherIndex); } } } else if (isOnDesktop()) { jassert (other->isOnDesktop()); if (other->isOnDesktop()) { auto* us = getPeer(); auto* them = other->getPeer(); jassert (us != nullptr && them != nullptr); if (us != nullptr && them != nullptr) us->toBehind (them); } } } } void Component::toBack() { if (isOnDesktop()) { jassertfalse; //xxx need to add this to native window } else if (parentComponent != nullptr) { auto& childList = parentComponent->childComponentList; if (childList.getFirst() != this) { auto index = childList.indexOf (this); if (index > 0) { int insertIndex = 0; if (flags.alwaysOnTopFlag) while (insertIndex < childList.size() && ! childList.getUnchecked (insertIndex)->isAlwaysOnTop()) ++insertIndex; parentComponent->reorderChildInternal (index, insertIndex); } } } } void Component::setAlwaysOnTop (bool shouldStayOnTop) { if (shouldStayOnTop != flags.alwaysOnTopFlag) { BailOutChecker checker (this); flags.alwaysOnTopFlag = shouldStayOnTop; if (isOnDesktop()) { if (auto* peer = getPeer()) { if (! peer->setAlwaysOnTop (shouldStayOnTop)) { // some kinds of peer can't change their always-on-top status, so // for these, we'll need to create a new window auto oldFlags = peer->getStyleFlags(); removeFromDesktop(); addToDesktop (oldFlags); } } } if (shouldStayOnTop && ! checker.shouldBailOut()) toFront (false); if (! checker.shouldBailOut()) internalHierarchyChanged(); } } bool Component::isAlwaysOnTop() const noexcept { return flags.alwaysOnTopFlag; } //============================================================================== int Component::proportionOfWidth (float proportion) const noexcept { return roundToInt (proportion * (float) boundsRelativeToParent.getWidth()); } int Component::proportionOfHeight (float proportion) const noexcept { return roundToInt (proportion * (float) boundsRelativeToParent.getHeight()); } int Component::getParentWidth() const noexcept { return parentComponent != nullptr ? parentComponent->getWidth() : getParentMonitorArea().getWidth(); } int Component::getParentHeight() const noexcept { return parentComponent != nullptr ? parentComponent->getHeight() : getParentMonitorArea().getHeight(); } Rectangle Component::getParentMonitorArea() const { return Desktop::getInstance().getDisplays().getDisplayForRect (getScreenBounds())->userArea; } int Component::getScreenX() const { return getScreenPosition().x; } int Component::getScreenY() const { return getScreenPosition().y; } Point Component::getScreenPosition() const { return localPointToGlobal (Point()); } Rectangle Component::getScreenBounds() const { return localAreaToGlobal (getLocalBounds()); } Point Component::getLocalPoint (const Component* source, Point point) const { return detail::ComponentHelpers::convertCoordinate (this, source, point); } Point Component::getLocalPoint (const Component* source, Point point) const { return detail::ComponentHelpers::convertCoordinate (this, source, point); } Rectangle Component::getLocalArea (const Component* source, Rectangle area) const { return detail::ComponentHelpers::convertCoordinate (this, source, area); } Rectangle Component::getLocalArea (const Component* source, Rectangle area) const { return detail::ComponentHelpers::convertCoordinate (this, source, area); } Point Component::localPointToGlobal (Point point) const { return detail::ComponentHelpers::convertCoordinate (nullptr, this, point); } Point Component::localPointToGlobal (Point point) const { return detail::ComponentHelpers::convertCoordinate (nullptr, this, point); } Rectangle Component::localAreaToGlobal (Rectangle area) const { return detail::ComponentHelpers::convertCoordinate (nullptr, this, area); } Rectangle Component::localAreaToGlobal (Rectangle area) const { return detail::ComponentHelpers::convertCoordinate (nullptr, this, area); } //============================================================================== void Component::setBounds (int x, int y, int w, int h) { // if component methods are being called from threads other than the message // thread, you'll need to use a MessageManagerLock object to make sure it's thread-safe. JUCE_ASSERT_MESSAGE_MANAGER_IS_LOCKED_OR_OFFSCREEN if (w < 0) w = 0; if (h < 0) h = 0; const bool wasResized = (getWidth() != w || getHeight() != h); const bool wasMoved = (getX() != x || getY() != y); #if JUCE_DEBUG // It's a very bad idea to try to resize a window during its paint() method! jassert (! (flags.isInsidePaintCall && wasResized && isOnDesktop())); #endif if (wasMoved || wasResized) { const bool showing = isShowing(); if (showing) { // send a fake mouse move to trigger enter/exit messages if needed.. sendFakeMouseMove(); if (! flags.hasHeavyweightPeerFlag) repaintParent(); } boundsRelativeToParent.setBounds (x, y, w, h); if (showing) { if (wasResized) repaint(); else if (! flags.hasHeavyweightPeerFlag) repaintParent(); } else if (cachedImage != nullptr) { cachedImage->invalidateAll(); } flags.isMoveCallbackPending = wasMoved; flags.isResizeCallbackPending = wasResized; if (flags.hasHeavyweightPeerFlag) if (auto* peer = getPeer()) peer->updateBounds(); sendMovedResizedMessagesIfPending(); } } void Component::sendMovedResizedMessagesIfPending() { const bool wasMoved = flags.isMoveCallbackPending; const bool wasResized = flags.isResizeCallbackPending; if (wasMoved || wasResized) { flags.isMoveCallbackPending = false; flags.isResizeCallbackPending = false; sendMovedResizedMessages (wasMoved, wasResized); } } void Component::sendMovedResizedMessages (bool wasMoved, bool wasResized) { BailOutChecker checker (this); if (wasMoved) { moved(); if (checker.shouldBailOut()) return; } if (wasResized) { resized(); if (checker.shouldBailOut()) return; for (int i = childComponentList.size(); --i >= 0;) { childComponentList.getUnchecked (i)->parentSizeChanged(); if (checker.shouldBailOut()) return; i = jmin (i, childComponentList.size()); } } if (parentComponent != nullptr) parentComponent->childBoundsChanged (this); if (! checker.shouldBailOut()) { componentListeners.callChecked (checker, [this, wasMoved, wasResized] (ComponentListener& l) { l.componentMovedOrResized (*this, wasMoved, wasResized); }); } if ((wasMoved || wasResized) && ! checker.shouldBailOut()) if (auto* handler = getAccessibilityHandler()) detail::AccessibilityHelpers::notifyAccessibilityEvent (*handler, detail::AccessibilityHelpers::Event::elementMovedOrResized); } void Component::setSize (int w, int h) { setBounds (getX(), getY(), w, h); } void Component::setTopLeftPosition (int x, int y) { setTopLeftPosition ({ x, y }); } void Component::setTopLeftPosition (Point pos) { setBounds (pos.x, pos.y, getWidth(), getHeight()); } void Component::setTopRightPosition (int x, int y) { setTopLeftPosition (x - getWidth(), y); } void Component::setBounds (Rectangle r) { setBounds (r.getX(), r.getY(), r.getWidth(), r.getHeight()); } void Component::setCentrePosition (Point p) { setBounds (getBounds().withCentre (p.transformedBy (getTransform().inverted()))); } void Component::setCentrePosition (int x, int y) { setCentrePosition ({ x, y }); } void Component::setCentreRelative (float x, float y) { setCentrePosition (roundToInt ((float) getParentWidth() * x), roundToInt ((float) getParentHeight() * y)); } void Component::setBoundsRelative (Rectangle target) { setBounds ((target * Point ((float) getParentWidth(), (float) getParentHeight())).toNearestInt()); } void Component::setBoundsRelative (float x, float y, float w, float h) { setBoundsRelative ({ x, y, w, h }); } void Component::centreWithSize (int width, int height) { auto parentArea = detail::ComponentHelpers::getParentOrMainMonitorBounds (*this) .transformedBy (getTransform().inverted()); setBounds (parentArea.getCentreX() - width / 2, parentArea.getCentreY() - height / 2, width, height); } void Component::setBoundsInset (BorderSize borders) { setBounds (borders.subtractedFrom (detail::ComponentHelpers::getParentOrMainMonitorBounds (*this))); } void Component::setBoundsToFit (Rectangle targetArea, Justification justification, bool onlyReduceInSize) { if (getLocalBounds().isEmpty() || targetArea.isEmpty()) { // it's no good calling this method unless both the component and // target rectangle have a finite size. jassertfalse; return; } auto sourceArea = targetArea.withZeroOrigin(); if (onlyReduceInSize && getWidth() <= targetArea.getWidth() && getHeight() <= targetArea.getHeight()) { sourceArea = getLocalBounds(); } else { auto sourceRatio = getHeight() / (double) getWidth(); auto targetRatio = targetArea.getHeight() / (double) targetArea.getWidth(); if (sourceRatio <= targetRatio) sourceArea.setHeight (jmin (targetArea.getHeight(), roundToInt (targetArea.getWidth() * sourceRatio))); else sourceArea.setWidth (jmin (targetArea.getWidth(), roundToInt (targetArea.getHeight() / sourceRatio))); } if (! sourceArea.isEmpty()) setBounds (justification.appliedToRectangle (sourceArea, targetArea)); } //============================================================================== void Component::setTransform (const AffineTransform& newTransform) { // If you pass in a transform with no inverse, the component will have no dimensions, // and there will be all sorts of maths errors when converting coordinates. jassert (! newTransform.isSingularity()); if (newTransform.isIdentity()) { if (affineTransform != nullptr) { repaint(); affineTransform.reset(); repaint(); sendMovedResizedMessages (false, false); } } else if (affineTransform == nullptr) { repaint(); affineTransform.reset (new AffineTransform (newTransform)); repaint(); sendMovedResizedMessages (false, false); } else if (*affineTransform != newTransform) { repaint(); *affineTransform = newTransform; repaint(); sendMovedResizedMessages (false, false); } } bool Component::isTransformed() const noexcept { return affineTransform != nullptr; } AffineTransform Component::getTransform() const { return affineTransform != nullptr ? *affineTransform : AffineTransform(); } float Component::getApproximateScaleFactorForComponent (const Component* targetComponent) { AffineTransform transform; for (auto* target = targetComponent; target != nullptr; target = target->getParentComponent()) { transform = transform.followedBy (target->getTransform()); if (target->isOnDesktop()) transform = transform.scaled (target->getDesktopScaleFactor()); } auto transformScale = std::sqrt (std::abs (transform.getDeterminant())); return transformScale / Desktop::getInstance().getGlobalScaleFactor(); } //============================================================================== bool Component::hitTest (int x, int y) { if (! flags.ignoresMouseClicksFlag) return true; if (flags.allowChildMouseClicksFlag) { for (int i = childComponentList.size(); --i >= 0;) { auto& child = *childComponentList.getUnchecked (i); if (child.isVisible() && detail::ComponentHelpers::hitTest (child, detail::ComponentHelpers::convertFromParentSpace (child, Point (x, y).toFloat()))) return true; } } return false; } void Component::setInterceptsMouseClicks (bool allowClicks, bool allowClicksOnChildComponents) noexcept { flags.ignoresMouseClicksFlag = ! allowClicks; flags.allowChildMouseClicksFlag = allowClicksOnChildComponents; } void Component::getInterceptsMouseClicks (bool& allowsClicksOnThisComponent, bool& allowsClicksOnChildComponents) const noexcept { allowsClicksOnThisComponent = ! flags.ignoresMouseClicksFlag; allowsClicksOnChildComponents = flags.allowChildMouseClicksFlag; } bool Component::contains (Point point) { return contains (point.toFloat()); } bool Component::contains (Point point) { if (detail::ComponentHelpers::hitTest (*this, point)) { if (parentComponent != nullptr) return parentComponent->contains (detail::ComponentHelpers::convertToParentSpace (*this, point)); if (flags.hasHeavyweightPeerFlag) if (auto* peer = getPeer()) return peer->contains (detail::ComponentHelpers::localPositionToRawPeerPos (*this, point).roundToInt(), true); } return false; } bool Component::reallyContains (Point point, bool returnTrueIfWithinAChild) { return reallyContains (point.toFloat(), returnTrueIfWithinAChild); } bool Component::reallyContains (Point point, bool returnTrueIfWithinAChild) { if (! contains (point)) return false; auto* top = getTopLevelComponent(); auto* compAtPosition = top->getComponentAt (top->getLocalPoint (this, point)); return (compAtPosition == this) || (returnTrueIfWithinAChild && isParentOf (compAtPosition)); } Component* Component::getComponentAt (Point position) { return getComponentAt (position.toFloat()); } Component* Component::getComponentAt (Point position) { if (flags.visibleFlag && detail::ComponentHelpers::hitTest (*this, position)) { for (int i = childComponentList.size(); --i >= 0;) { auto* child = childComponentList.getUnchecked (i); child = child->getComponentAt (detail::ComponentHelpers::convertFromParentSpace (*child, position)); if (child != nullptr) return child; } return this; } return nullptr; } Component* Component::getComponentAt (int x, int y) { return getComponentAt (Point { x, y }); } //============================================================================== void Component::addChildComponent (Component& child, int zOrder) { // if component methods are being called from threads other than the message // thread, you'll need to use a MessageManagerLock object to make sure it's thread-safe. JUCE_ASSERT_MESSAGE_MANAGER_IS_LOCKED_OR_OFFSCREEN jassert (this != &child); // adding a component to itself!? if (child.parentComponent != this) { if (child.parentComponent != nullptr) child.parentComponent->removeChildComponent (&child); else child.removeFromDesktop(); child.parentComponent = this; if (child.isVisible()) child.repaintParent(); if (! child.isAlwaysOnTop()) { if (zOrder < 0 || zOrder > childComponentList.size()) zOrder = childComponentList.size(); while (zOrder > 0) { if (! childComponentList.getUnchecked (zOrder - 1)->isAlwaysOnTop()) break; --zOrder; } } childComponentList.insert (zOrder, &child); child.internalHierarchyChanged(); internalChildrenChanged(); } } void Component::addAndMakeVisible (Component& child, int zOrder) { child.setVisible (true); addChildComponent (child, zOrder); } void Component::addChildComponent (Component* child, int zOrder) { if (child != nullptr) addChildComponent (*child, zOrder); } void Component::addAndMakeVisible (Component* child, int zOrder) { if (child != nullptr) addAndMakeVisible (*child, zOrder); } void Component::addChildAndSetID (Component* child, const String& childID) { if (child != nullptr) { child->setComponentID (childID); addAndMakeVisible (child); } } void Component::removeChildComponent (Component* child) { removeChildComponent (childComponentList.indexOf (child), true, true); } Component* Component::removeChildComponent (int index) { return removeChildComponent (index, true, true); } Component* Component::removeChildComponent (int index, bool sendParentEvents, bool sendChildEvents) { // if component methods are being called from threads other than the message // thread, you'll need to use a MessageManagerLock object to make sure it's thread-safe. JUCE_ASSERT_MESSAGE_MANAGER_IS_LOCKED_OR_OFFSCREEN if (auto* child = childComponentList [index]) { sendParentEvents = sendParentEvents && child->isShowing(); if (sendParentEvents) { sendFakeMouseMove(); if (child->isVisible()) child->repaintParent(); } childComponentList.remove (index); child->parentComponent = nullptr; detail::ComponentHelpers::releaseAllCachedImageResources (*child); // (NB: there are obscure situations where child->isShowing() = false, but it still has the focus) if (child->hasKeyboardFocus (true)) { const WeakReference safeThis (this); child->giveAwayKeyboardFocusInternal (sendChildEvents || currentlyFocusedComponent != child); if (sendParentEvents) { if (safeThis == nullptr) return child; grabKeyboardFocus(); } } if (sendChildEvents) child->internalHierarchyChanged(); if (sendParentEvents) internalChildrenChanged(); return child; } return nullptr; } //============================================================================== void Component::removeAllChildren() { while (! childComponentList.isEmpty()) removeChildComponent (childComponentList.size() - 1); } void Component::deleteAllChildren() { while (! childComponentList.isEmpty()) delete (removeChildComponent (childComponentList.size() - 1)); } int Component::getNumChildComponents() const noexcept { return childComponentList.size(); } Component* Component::getChildComponent (int index) const noexcept { return childComponentList[index]; } int Component::getIndexOfChildComponent (const Component* child) const noexcept { return childComponentList.indexOf (const_cast (child)); } Component* Component::findChildWithID (StringRef targetID) const noexcept { for (auto* c : childComponentList) if (c->componentID == targetID) return c; return nullptr; } Component* Component::getTopLevelComponent() const noexcept { auto* comp = this; while (comp->parentComponent != nullptr) comp = comp->parentComponent; return const_cast (comp); } bool Component::isParentOf (const Component* possibleChild) const noexcept { while (possibleChild != nullptr) { possibleChild = possibleChild->parentComponent; if (possibleChild == this) return true; } return false; } //============================================================================== void Component::parentHierarchyChanged() {} void Component::childrenChanged() {} void Component::internalChildrenChanged() { if (componentListeners.isEmpty()) { childrenChanged(); } else { BailOutChecker checker (this); childrenChanged(); if (! checker.shouldBailOut()) componentListeners.callChecked (checker, [this] (ComponentListener& l) { l.componentChildrenChanged (*this); }); } } void Component::internalHierarchyChanged() { BailOutChecker checker (this); parentHierarchyChanged(); if (checker.shouldBailOut()) return; componentListeners.callChecked (checker, [this] (ComponentListener& l) { l.componentParentHierarchyChanged (*this); }); if (checker.shouldBailOut()) return; for (int i = childComponentList.size(); --i >= 0;) { childComponentList.getUnchecked (i)->internalHierarchyChanged(); if (checker.shouldBailOut()) { // you really shouldn't delete the parent component during a callback telling you // that it's changed.. jassertfalse; return; } i = jmin (i, childComponentList.size()); } if (flags.hasHeavyweightPeerFlag) if (auto* handler = getAccessibilityHandler()) handler->notifyAccessibilityEvent (AccessibilityEvent::structureChanged); } //============================================================================== #if JUCE_MODAL_LOOPS_PERMITTED int Component::runModalLoop() { if (! MessageManager::getInstance()->isThisTheMessageThread()) { // use a callback so this can be called from non-gui threads return (int) (pointer_sized_int) MessageManager::getInstance() ->callFunctionOnMessageThread (&detail::ComponentHelpers::runModalLoopCallback, this); } if (! isCurrentlyModal (false)) enterModalState (true); return ModalComponentManager::getInstance()->runEventLoopForCurrentComponent(); } #endif //============================================================================== void Component::enterModalState (bool shouldTakeKeyboardFocus, ModalComponentManager::Callback* callback, bool deleteWhenDismissed) { // if component methods are being called from threads other than the message // thread, you'll need to use a MessageManagerLock object to make sure it's thread-safe. JUCE_ASSERT_MESSAGE_MANAGER_IS_LOCKED SafePointer safeReference { this }; if (! isCurrentlyModal (false)) { // While this component is in modal state it may block other components from receiving // mouseExit events. To keep mouseEnter and mouseExit calls balanced on these components, // we must manually force the mouse to "leave" blocked components. detail::ComponentHelpers::sendMouseEventToComponentsThatAreBlockedByModal (*this, &Component::internalMouseExit); if (safeReference == nullptr) { // If you hit this assertion, the mouse-exit event above has caused the modal component to be deleted. jassertfalse; return; } auto& mcm = *ModalComponentManager::getInstance(); mcm.startModal (this, deleteWhenDismissed); mcm.attachCallback (this, callback); setVisible (true); if (shouldTakeKeyboardFocus) grabKeyboardFocus(); } else { // Probably a bad idea to try to make a component modal twice! jassertfalse; } } void Component::exitModalState (int returnValue) { WeakReference deletionChecker (this); if (isCurrentlyModal (false)) { if (MessageManager::getInstance()->isThisTheMessageThread()) { auto& mcm = *ModalComponentManager::getInstance(); mcm.endModal (this, returnValue); mcm.bringModalComponentsToFront(); // While this component is in modal state it may block other components from receiving // mouseEnter events. To keep mouseEnter and mouseExit calls balanced on these components, // we must manually force the mouse to "enter" blocked components. if (deletionChecker != nullptr) detail::ComponentHelpers::sendMouseEventToComponentsThatAreBlockedByModal (*deletionChecker, &Component::internalMouseEnter); } else { MessageManager::callAsync ([target = WeakReference { this }, returnValue] { if (target != nullptr) target->exitModalState (returnValue); }); } } } bool Component::isCurrentlyModal (bool onlyConsiderForemostModalComponent) const noexcept { auto& mcm = *ModalComponentManager::getInstance(); return onlyConsiderForemostModalComponent ? mcm.isFrontModalComponent (this) : mcm.isModal (this); } bool Component::isCurrentlyBlockedByAnotherModalComponent() const { return detail::ComponentHelpers::modalWouldBlockComponent (*this, getCurrentlyModalComponent()); } int JUCE_CALLTYPE Component::getNumCurrentlyModalComponents() noexcept { return ModalComponentManager::getInstance()->getNumModalComponents(); } Component* JUCE_CALLTYPE Component::getCurrentlyModalComponent (int index) noexcept { return ModalComponentManager::getInstance()->getModalComponent (index); } //============================================================================== void Component::setBroughtToFrontOnMouseClick (bool shouldBeBroughtToFront) noexcept { flags.bringToFrontOnClickFlag = shouldBeBroughtToFront; } bool Component::isBroughtToFrontOnMouseClick() const noexcept { return flags.bringToFrontOnClickFlag; } //============================================================================== void Component::setMouseCursor (const MouseCursor& newCursor) { if (cursor != newCursor) { cursor = newCursor; if (flags.visibleFlag) updateMouseCursor(); } } MouseCursor Component::getMouseCursor() { return cursor; } void Component::updateMouseCursor() const { Desktop::getInstance().getMainMouseSource().forceMouseCursorUpdate(); } //============================================================================== void Component::setRepaintsOnMouseActivity (bool shouldRepaint) noexcept { flags.repaintOnMouseActivityFlag = shouldRepaint; } //============================================================================== float Component::getAlpha() const noexcept { return (255 - componentTransparency) / 255.0f; } void Component::setAlpha (float newAlpha) { auto newIntAlpha = (uint8) (255 - jlimit (0, 255, roundToInt (newAlpha * 255.0))); if (componentTransparency != newIntAlpha) { componentTransparency = newIntAlpha; alphaChanged(); } } void Component::alphaChanged() { if (flags.hasHeavyweightPeerFlag) { if (auto* peer = getPeer()) peer->setAlpha (getAlpha()); } else { repaint(); } } //============================================================================== void Component::repaint() { internalRepaintUnchecked (getLocalBounds(), true); } void Component::repaint (int x, int y, int w, int h) { internalRepaint ({ x, y, w, h }); } void Component::repaint (Rectangle area) { internalRepaint (area); } void Component::repaintParent() { if (parentComponent != nullptr) parentComponent->internalRepaint (detail::ComponentHelpers::convertToParentSpace (*this, getLocalBounds())); } void Component::internalRepaint (Rectangle area) { area = area.getIntersection (getLocalBounds()); if (! area.isEmpty()) internalRepaintUnchecked (area, false); } void Component::internalRepaintUnchecked (Rectangle area, bool isEntireComponent) { // if component methods are being called from threads other than the message // thread, you'll need to use a MessageManagerLock object to make sure it's thread-safe. JUCE_ASSERT_MESSAGE_MANAGER_IS_LOCKED if (flags.visibleFlag) { if (cachedImage != nullptr) if (! (isEntireComponent ? cachedImage->invalidateAll() : cachedImage->invalidate (area))) return; if (area.isEmpty()) return; if (flags.hasHeavyweightPeerFlag) { if (auto* peer = getPeer()) { // Tweak the scaling so that the component's integer size exactly aligns with the peer's scaled size auto peerBounds = peer->getBounds(); auto scaled = area * Point ((float) peerBounds.getWidth() / (float) getWidth(), (float) peerBounds.getHeight() / (float) getHeight()); peer->repaint (affineTransform != nullptr ? scaled.transformedBy (*affineTransform) : scaled); } } else { if (parentComponent != nullptr) parentComponent->internalRepaint (detail::ComponentHelpers::convertToParentSpace (*this, area)); } } } //============================================================================== void Component::paint (Graphics&) { // if your component is marked as opaque, you must implement a paint // method and ensure that its entire area is completely painted. jassert (getBounds().isEmpty() || ! isOpaque()); } void Component::paintOverChildren (Graphics&) { // all painting is done in the subclasses } //============================================================================== void Component::paintWithinParentContext (Graphics& g) { g.setOrigin (getPosition()); if (cachedImage != nullptr) cachedImage->paint (g); else paintEntireComponent (g, false); } void Component::paintComponentAndChildren (Graphics& g) { auto clipBounds = g.getClipBounds(); if (flags.dontClipGraphicsFlag && getNumChildComponents() == 0) { paint (g); } else { Graphics::ScopedSaveState ss (g); if (! (detail::ComponentHelpers::clipObscuredRegions (*this, g, clipBounds, {}) && g.isClipEmpty())) paint (g); } for (int i = 0; i < childComponentList.size(); ++i) { auto& child = *childComponentList.getUnchecked (i); if (child.isVisible()) { if (child.affineTransform != nullptr) { Graphics::ScopedSaveState ss (g); g.addTransform (*child.affineTransform); if ((child.flags.dontClipGraphicsFlag && ! g.isClipEmpty()) || g.reduceClipRegion (child.getBounds())) child.paintWithinParentContext (g); } else if (clipBounds.intersects (child.getBounds())) { Graphics::ScopedSaveState ss (g); if (child.flags.dontClipGraphicsFlag) { child.paintWithinParentContext (g); } else if (g.reduceClipRegion (child.getBounds())) { bool nothingClipped = true; for (int j = i + 1; j < childComponentList.size(); ++j) { auto& sibling = *childComponentList.getUnchecked (j); if (sibling.flags.opaqueFlag && sibling.isVisible() && sibling.affineTransform == nullptr) { nothingClipped = false; g.excludeClipRegion (sibling.getBounds()); } } if (nothingClipped || ! g.isClipEmpty()) child.paintWithinParentContext (g); } } } } Graphics::ScopedSaveState ss (g); paintOverChildren (g); } void Component::paintEntireComponent (Graphics& g, bool ignoreAlphaLevel) { // If sizing a top-level-window and the OS paint message is delivered synchronously // before resized() is called, then we'll invoke the callback here, to make sure // the components inside have had a chance to sort their sizes out.. #if JUCE_DEBUG if (! flags.isInsidePaintCall) // (avoids an assertion in plugins hosted in WaveLab) #endif sendMovedResizedMessagesIfPending(); #if JUCE_DEBUG flags.isInsidePaintCall = true; #endif if (effect != nullptr) { auto scale = g.getInternalContext().getPhysicalPixelScaleFactor(); auto scaledBounds = getLocalBounds() * scale; Image effectImage (flags.opaqueFlag ? Image::RGB : Image::ARGB, scaledBounds.getWidth(), scaledBounds.getHeight(), ! flags.opaqueFlag); { Graphics g2 (effectImage); g2.addTransform (AffineTransform::scale ((float) scaledBounds.getWidth() / (float) getWidth(), (float) scaledBounds.getHeight() / (float) getHeight())); paintComponentAndChildren (g2); } Graphics::ScopedSaveState ss (g); g.addTransform (AffineTransform::scale (1.0f / scale)); effect->applyEffect (effectImage, g, scale, ignoreAlphaLevel ? 1.0f : getAlpha()); } else if (componentTransparency > 0 && ! ignoreAlphaLevel) { if (componentTransparency < 255) { g.beginTransparencyLayer (getAlpha()); paintComponentAndChildren (g); g.endTransparencyLayer(); } } else { paintComponentAndChildren (g); } #if JUCE_DEBUG flags.isInsidePaintCall = false; #endif } void Component::setPaintingIsUnclipped (bool shouldPaintWithoutClipping) noexcept { flags.dontClipGraphicsFlag = shouldPaintWithoutClipping; } bool Component::isPaintingUnclipped() const noexcept { return flags.dontClipGraphicsFlag; } //============================================================================== Image Component::createComponentSnapshot (Rectangle areaToGrab, bool clipImageToComponentBounds, float scaleFactor) { auto r = areaToGrab; if (clipImageToComponentBounds) r = r.getIntersection (getLocalBounds()); if (r.isEmpty()) return {}; auto w = roundToInt (scaleFactor * (float) r.getWidth()); auto h = roundToInt (scaleFactor * (float) r.getHeight()); Image image (flags.opaqueFlag ? Image::RGB : Image::ARGB, w, h, true); Graphics g (image); if (w != getWidth() || h != getHeight()) g.addTransform (AffineTransform::scale ((float) w / (float) r.getWidth(), (float) h / (float) r.getHeight())); g.setOrigin (-r.getPosition()); paintEntireComponent (g, true); return image; } void Component::setComponentEffect (ImageEffectFilter* newEffect) { if (effect != newEffect) { effect = newEffect; repaint(); } } //============================================================================== LookAndFeel& Component::getLookAndFeel() const noexcept { for (auto* c = this; c != nullptr; c = c->parentComponent) if (auto lf = c->lookAndFeel.get()) return *lf; return LookAndFeel::getDefaultLookAndFeel(); } void Component::setLookAndFeel (LookAndFeel* newLookAndFeel) { if (lookAndFeel != newLookAndFeel) { lookAndFeel = newLookAndFeel; sendLookAndFeelChange(); } } void Component::lookAndFeelChanged() {} void Component::colourChanged() {} void Component::sendLookAndFeelChange() { const WeakReference safePointer (this); repaint(); lookAndFeelChanged(); if (safePointer != nullptr) { colourChanged(); if (safePointer != nullptr) { for (int i = childComponentList.size(); --i >= 0;) { childComponentList.getUnchecked (i)->sendLookAndFeelChange(); if (safePointer == nullptr) return; i = jmin (i, childComponentList.size()); } } } } Colour Component::findColour (int colourID, bool inheritFromParent) const { if (auto* v = properties.getVarPointer (detail::ComponentHelpers::getColourPropertyID (colourID))) return Colour ((uint32) static_cast (*v)); if (inheritFromParent && parentComponent != nullptr && (lookAndFeel == nullptr || ! lookAndFeel->isColourSpecified (colourID))) return parentComponent->findColour (colourID, true); return getLookAndFeel().findColour (colourID); } bool Component::isColourSpecified (int colourID) const { return properties.contains (detail::ComponentHelpers::getColourPropertyID (colourID)); } void Component::removeColour (int colourID) { if (properties.remove (detail::ComponentHelpers::getColourPropertyID (colourID))) colourChanged(); } void Component::setColour (int colourID, Colour colour) { if (properties.set (detail::ComponentHelpers::getColourPropertyID (colourID), (int) colour.getARGB())) colourChanged(); } void Component::copyAllExplicitColoursTo (Component& target) const { bool changed = false; for (int i = properties.size(); --i >= 0;) { auto name = properties.getName (i); if (name.toString().startsWith (detail::colourPropertyPrefix)) if (target.properties.set (name, properties [name])) changed = true; } if (changed) target.colourChanged(); } //============================================================================== Component::Positioner::Positioner (Component& c) noexcept : component (c) { } Component::Positioner* Component::getPositioner() const noexcept { return positioner.get(); } void Component::setPositioner (Positioner* newPositioner) { // You can only assign a positioner to the component that it was created for! jassert (newPositioner == nullptr || this == &(newPositioner->getComponent())); positioner.reset (newPositioner); } //============================================================================== Rectangle Component::getLocalBounds() const noexcept { return boundsRelativeToParent.withZeroOrigin(); } Rectangle Component::getBoundsInParent() const noexcept { return affineTransform == nullptr ? boundsRelativeToParent : boundsRelativeToParent.transformedBy (*affineTransform); } //============================================================================== void Component::mouseEnter (const MouseEvent&) {} void Component::mouseExit (const MouseEvent&) {} void Component::mouseDown (const MouseEvent&) {} void Component::mouseUp (const MouseEvent&) {} void Component::mouseDrag (const MouseEvent&) {} void Component::mouseMove (const MouseEvent&) {} void Component::mouseDoubleClick (const MouseEvent&) {} void Component::mouseWheelMove (const MouseEvent& e, const MouseWheelDetails& wheel) { // the base class just passes this event up to the nearest enabled ancestor if (auto* enabledComponent = findFirstEnabledAncestor (getParentComponent())) enabledComponent->mouseWheelMove (e.getEventRelativeTo (enabledComponent), wheel); } void Component::mouseMagnify (const MouseEvent& e, float magnifyAmount) { // the base class just passes this event up to the nearest enabled ancestor if (auto* enabledComponent = findFirstEnabledAncestor (getParentComponent())) enabledComponent->mouseMagnify (e.getEventRelativeTo (enabledComponent), magnifyAmount); } //============================================================================== void Component::resized() {} void Component::moved() {} void Component::childBoundsChanged (Component*) {} void Component::parentSizeChanged() {} void Component::addComponentListener (ComponentListener* newListener) { // if component methods are being called from threads other than the message // thread, you'll need to use a MessageManagerLock object to make sure it's thread-safe. #if JUCE_DEBUG || JUCE_LOG_ASSERTIONS if (getParentComponent() != nullptr) { JUCE_ASSERT_MESSAGE_MANAGER_IS_LOCKED } #endif componentListeners.add (newListener); } void Component::removeComponentListener (ComponentListener* listenerToRemove) { componentListeners.remove (listenerToRemove); } //============================================================================== void Component::inputAttemptWhenModal() { ModalComponentManager::getInstance()->bringModalComponentsToFront(); getLookAndFeel().playAlertSound(); } bool Component::canModalEventBeSentToComponent (const Component*) { return false; } void Component::internalModalInputAttempt() { if (auto* current = getCurrentlyModalComponent()) current->inputAttemptWhenModal(); } //============================================================================== void Component::postCommandMessage (int commandID) { MessageManager::callAsync ([target = WeakReference { this }, commandID] { if (target != nullptr) target->handleCommandMessage (commandID); }); } void Component::handleCommandMessage (int) { // used by subclasses } //============================================================================== void Component::addMouseListener (MouseListener* newListener, bool wantsEventsForAllNestedChildComponents) { // if component methods are being called from threads other than the message // thread, you'll need to use a MessageManagerLock object to make sure it's thread-safe. JUCE_ASSERT_MESSAGE_MANAGER_IS_LOCKED // If you register a component as a mouselistener for itself, it'll receive all the events // twice - once via the direct callback that all components get anyway, and then again as a listener! jassert ((newListener != this) || wantsEventsForAllNestedChildComponents); if (mouseListeners == nullptr) mouseListeners.reset (new MouseListenerList()); mouseListeners->addListener (newListener, wantsEventsForAllNestedChildComponents); } void Component::removeMouseListener (MouseListener* listenerToRemove) { // if component methods are being called from threads other than the message // thread, you'll need to use a MessageManagerLock object to make sure it's thread-safe. JUCE_ASSERT_MESSAGE_MANAGER_IS_LOCKED if (mouseListeners != nullptr) mouseListeners->removeListener (listenerToRemove); } //============================================================================== void Component::internalMouseEnter (MouseInputSource source, Point relativePos, Time time) { if (isCurrentlyBlockedByAnotherModalComponent()) { // if something else is modal, always just show a normal mouse cursor source.showMouseCursor (MouseCursor::NormalCursor); return; } if (flags.repaintOnMouseActivityFlag) repaint(); const auto me = makeMouseEvent (source, detail::PointerState().withPosition (relativePos), source.getCurrentModifiers(), this, this, time, relativePos, time, 0, false); HierarchyChecker checker (this, me); mouseEnter (me); flags.cachedMouseInsideComponent = true; if (checker.shouldBailOut()) return; Desktop::getInstance().getMouseListeners().callChecked (checker, [&] (MouseListener& l) { l.mouseEnter (me); }); MouseListenerList::sendMouseEvent (checker, &MouseListener::mouseEnter); } void Component::internalMouseExit (MouseInputSource source, Point relativePos, Time time) { if (isCurrentlyBlockedByAnotherModalComponent()) { // if something else is modal, always just show a normal mouse cursor source.showMouseCursor (MouseCursor::NormalCursor); return; } if (flags.repaintOnMouseActivityFlag) repaint(); flags.cachedMouseInsideComponent = false; const auto me = makeMouseEvent (source, detail::PointerState().withPosition (relativePos), source.getCurrentModifiers(), this, this, time, relativePos, time, 0, false); HierarchyChecker checker (this, me); mouseExit (me); if (checker.shouldBailOut()) return; Desktop::getInstance().getMouseListeners().callChecked (checker, [&] (MouseListener& l) { l.mouseExit (me); }); MouseListenerList::sendMouseEvent (checker, &MouseListener::mouseExit); } void Component::internalMouseDown (MouseInputSource source, const detail::PointerState& relativePointerState, Time time) { auto& desktop = Desktop::getInstance(); const auto me = makeMouseEvent (source, relativePointerState, source.getCurrentModifiers(), this, this, time, relativePointerState.position, time, source.getNumberOfMultipleClicks(), false); HierarchyChecker checker (this, me); if (isCurrentlyBlockedByAnotherModalComponent()) { flags.mouseDownWasBlocked = true; internalModalInputAttempt(); if (checker.shouldBailOut()) return; // If processing the input attempt has exited the modal loop, we'll allow the event // to be delivered.. if (isCurrentlyBlockedByAnotherModalComponent()) { // allow blocked mouse-events to go to global listeners.. desktop.getMouseListeners().callChecked (checker, [&] (MouseListener& l) { l.mouseDown (checker.eventWithNearestParent()); }); return; } } flags.mouseDownWasBlocked = false; for (auto* c = this; c != nullptr; c = c->parentComponent) { if (c->isBroughtToFrontOnMouseClick()) { c->toFront (true); if (checker.shouldBailOut()) return; } } if (! flags.dontFocusOnMouseClickFlag) { grabKeyboardFocusInternal (focusChangedByMouseClick, true, FocusChangeDirection::unknown); if (checker.shouldBailOut()) return; } if (flags.repaintOnMouseActivityFlag) repaint(); mouseDown (me); if (checker.shouldBailOut()) return; desktop.getMouseListeners().callChecked (checker, [&] (MouseListener& l) { l.mouseDown (checker.eventWithNearestParent()); }); MouseListenerList::sendMouseEvent (checker, &MouseListener::mouseDown); } void Component::internalMouseUp (MouseInputSource source, const detail::PointerState& relativePointerState, Time time, const ModifierKeys oldModifiers) { if (flags.mouseDownWasBlocked && isCurrentlyBlockedByAnotherModalComponent()) return; const auto me = makeMouseEvent (source, relativePointerState, oldModifiers, this, this, time, getLocalPoint (nullptr, source.getLastMouseDownPosition()), source.getLastMouseDownTime(), source.getNumberOfMultipleClicks(), source.isLongPressOrDrag()); HierarchyChecker checker (this, me); if (flags.repaintOnMouseActivityFlag) repaint(); mouseUp (me); if (checker.shouldBailOut()) return; auto& desktop = Desktop::getInstance(); desktop.getMouseListeners().callChecked (checker, [&] (MouseListener& l) { l.mouseUp (checker.eventWithNearestParent()); }); MouseListenerList::sendMouseEvent (checker, &MouseListener::mouseUp); if (checker.shouldBailOut()) return; // check for double-click if (me.getNumberOfClicks() >= 2) { if (checker.nearestNonNullParent() == this) mouseDoubleClick (checker.eventWithNearestParent()); if (checker.shouldBailOut()) return; desktop.mouseListeners.callChecked (checker, [&] (MouseListener& l) { l.mouseDoubleClick (checker.eventWithNearestParent()); }); MouseListenerList::sendMouseEvent (checker, &MouseListener::mouseDoubleClick); } } void Component::internalMouseDrag (MouseInputSource source, const detail::PointerState& relativePointerState, Time time) { if (! isCurrentlyBlockedByAnotherModalComponent()) { const auto me = makeMouseEvent (source, relativePointerState, source.getCurrentModifiers(), this, this, time, getLocalPoint (nullptr, source.getLastMouseDownPosition()), source.getLastMouseDownTime(), source.getNumberOfMultipleClicks(), source.isLongPressOrDrag()); HierarchyChecker checker (this, me); mouseDrag (me); if (checker.shouldBailOut()) return; Desktop::getInstance().getMouseListeners().callChecked (checker, [&] (MouseListener& l) { l.mouseDrag (checker.eventWithNearestParent()); }); MouseListenerList::sendMouseEvent (checker, &MouseListener::mouseDrag); } } void Component::internalMouseMove (MouseInputSource source, Point relativePos, Time time) { auto& desktop = Desktop::getInstance(); if (isCurrentlyBlockedByAnotherModalComponent()) { // allow blocked mouse-events to go to global listeners.. desktop.sendMouseMove(); } else { const auto me = makeMouseEvent (source, detail::PointerState().withPosition (relativePos), source.getCurrentModifiers(), this, this, time, relativePos, time, 0, false); HierarchyChecker checker (this, me); mouseMove (me); if (checker.shouldBailOut()) return; desktop.getMouseListeners().callChecked (checker, [&] (MouseListener& l) { l.mouseMove (checker.eventWithNearestParent()); }); MouseListenerList::sendMouseEvent (checker, &MouseListener::mouseMove); } } void Component::internalMouseWheel (MouseInputSource source, Point relativePos, Time time, const MouseWheelDetails& wheel) { auto& desktop = Desktop::getInstance(); const auto me = makeMouseEvent (source, detail::PointerState().withPosition (relativePos), source.getCurrentModifiers(), this, this, time, relativePos, time, 0, false); HierarchyChecker checker (this, me); if (isCurrentlyBlockedByAnotherModalComponent()) { // allow blocked mouse-events to go to global listeners.. desktop.mouseListeners.callChecked (checker, [&] (MouseListener& l) { l.mouseWheelMove (me, wheel); }); } else { mouseWheelMove (me, wheel); if (checker.shouldBailOut()) return; desktop.mouseListeners.callChecked (checker, [&] (MouseListener& l) { l.mouseWheelMove (checker.eventWithNearestParent(), wheel); }); if (! checker.shouldBailOut()) MouseListenerList::sendMouseEvent (checker, &MouseListener::mouseWheelMove, wheel); } } void Component::internalMagnifyGesture (MouseInputSource source, Point relativePos, Time time, float amount) { auto& desktop = Desktop::getInstance(); const auto me = makeMouseEvent (source, detail::PointerState().withPosition (relativePos), source.getCurrentModifiers(), this, this, time, relativePos, time, 0, false); HierarchyChecker checker (this, me); if (isCurrentlyBlockedByAnotherModalComponent()) { // allow blocked mouse-events to go to global listeners.. desktop.mouseListeners.callChecked (checker, [&] (MouseListener& l) { l.mouseMagnify (me, amount); }); } else { mouseMagnify (me, amount); if (checker.shouldBailOut()) return; desktop.mouseListeners.callChecked (checker, [&] (MouseListener& l) { l.mouseMagnify (checker.eventWithNearestParent(), amount); }); if (! checker.shouldBailOut()) MouseListenerList::sendMouseEvent (checker, &MouseListener::mouseMagnify, amount); } } void Component::sendFakeMouseMove() const { if (flags.ignoresMouseClicksFlag && ! flags.allowChildMouseClicksFlag) return; auto mainMouse = Desktop::getInstance().getMainMouseSource(); if (! mainMouse.isDragging()) mainMouse.triggerFakeMove(); } void JUCE_CALLTYPE Component::beginDragAutoRepeat (int interval) { Desktop::getInstance().beginDragAutoRepeat (interval); } //============================================================================== void Component::broughtToFront() { } void Component::internalBroughtToFront() { if (flags.hasHeavyweightPeerFlag) Desktop::getInstance().componentBroughtToFront (this); BailOutChecker checker (this); broughtToFront(); if (checker.shouldBailOut()) return; componentListeners.callChecked (checker, [this] (ComponentListener& l) { l.componentBroughtToFront (*this); }); if (checker.shouldBailOut()) return; // When brought to the front and there's a modal component blocking this one, // we need to bring the modal one to the front instead.. if (auto* cm = getCurrentlyModalComponent()) if (cm->getTopLevelComponent() != getTopLevelComponent()) ModalComponentManager::getInstance()->bringModalComponentsToFront (false); // very important that this is false, otherwise in Windows, // non-front components can't get focus when another modal comp is // active, and therefore can't receive mouse-clicks } //============================================================================== void Component::focusGained (FocusChangeType) {} void Component::focusGainedWithDirection (FocusChangeType, FocusChangeDirection) {} void Component::focusLost (FocusChangeType) {} void Component::focusOfChildComponentChanged (FocusChangeType) {} void Component::internalKeyboardFocusGain (FocusChangeType cause) { internalKeyboardFocusGain (cause, WeakReference (this), FocusChangeDirection::unknown); } void Component::internalKeyboardFocusGain (FocusChangeType cause, const WeakReference& safePointer, FocusChangeDirection direction) { focusGainedWithDirection (cause, direction); focusGained (cause); if (safePointer == nullptr) return; if (hasKeyboardFocus (false)) if (auto* handler = getAccessibilityHandler()) handler->grabFocus(); if (safePointer == nullptr) return; internalChildKeyboardFocusChange (cause, safePointer); } void Component::internalKeyboardFocusLoss (FocusChangeType cause) { const WeakReference safePointer (this); focusLost (cause); if (safePointer != nullptr) { if (auto* handler = getAccessibilityHandler()) handler->giveAwayFocus(); internalChildKeyboardFocusChange (cause, safePointer); } } void Component::internalChildKeyboardFocusChange (FocusChangeType cause, const WeakReference& safePointer) { const bool childIsNowKeyboardFocused = hasKeyboardFocus (true); if (flags.childKeyboardFocusedFlag != childIsNowKeyboardFocused) { flags.childKeyboardFocusedFlag = childIsNowKeyboardFocused; focusOfChildComponentChanged (cause); if (safePointer == nullptr) return; } if (parentComponent != nullptr) parentComponent->internalChildKeyboardFocusChange (cause, parentComponent); } void Component::setWantsKeyboardFocus (bool wantsFocus) noexcept { flags.wantsKeyboardFocusFlag = wantsFocus; } void Component::setMouseClickGrabsKeyboardFocus (bool shouldGrabFocus) { flags.dontFocusOnMouseClickFlag = ! shouldGrabFocus; } bool Component::getMouseClickGrabsKeyboardFocus() const noexcept { return ! flags.dontFocusOnMouseClickFlag; } bool Component::getWantsKeyboardFocus() const noexcept { return flags.wantsKeyboardFocusFlag && ! flags.isDisabledFlag; } void Component::setFocusContainerType (FocusContainerType containerType) noexcept { flags.isFocusContainerFlag = (containerType == FocusContainerType::focusContainer || containerType == FocusContainerType::keyboardFocusContainer); flags.isKeyboardFocusContainerFlag = (containerType == FocusContainerType::keyboardFocusContainer); } bool Component::isFocusContainer() const noexcept { return flags.isFocusContainerFlag; } bool Component::isKeyboardFocusContainer() const noexcept { return flags.isKeyboardFocusContainerFlag; } template static Component* findContainer (const Component* child, FocusContainerFn isFocusContainer) { if (auto* parent = child->getParentComponent()) { if ((parent->*isFocusContainer)() || parent->getParentComponent() == nullptr) return parent; return findContainer (parent, isFocusContainer); } return nullptr; } Component* Component::findFocusContainer() const { return findContainer (this, &Component::isFocusContainer); } Component* Component::findKeyboardFocusContainer() const { return findContainer (this, &Component::isKeyboardFocusContainer); } static const Identifier explicitFocusOrderId ("_jexfo"); int Component::getExplicitFocusOrder() const { return properties [explicitFocusOrderId]; } void Component::setExplicitFocusOrder (int newFocusOrderIndex) { properties.set (explicitFocusOrderId, newFocusOrderIndex); } std::unique_ptr Component::createFocusTraverser() { if (flags.isFocusContainerFlag || parentComponent == nullptr) return std::make_unique(); return parentComponent->createFocusTraverser(); } std::unique_ptr Component::createKeyboardFocusTraverser() { if (flags.isKeyboardFocusContainerFlag || parentComponent == nullptr) return std::make_unique(); return parentComponent->createKeyboardFocusTraverser(); } void Component::takeKeyboardFocus (FocusChangeType cause, FocusChangeDirection direction) { if (currentlyFocusedComponent == this) return; if (auto* peer = getPeer()) { const WeakReference safePointer (this); peer->grabFocus(); if (! peer->isFocused() || currentlyFocusedComponent == this) return; WeakReference componentLosingFocus (currentlyFocusedComponent); if (auto* losingFocus = componentLosingFocus.get()) if (auto* otherPeer = losingFocus->getPeer()) otherPeer->closeInputMethodContext(); currentlyFocusedComponent = this; Desktop::getInstance().triggerFocusCallback(); // call this after setting currentlyFocusedComponent so that the one that's // losing it has a chance to see where focus is going if (componentLosingFocus != nullptr) componentLosingFocus->internalKeyboardFocusLoss (cause); if (currentlyFocusedComponent == this) internalKeyboardFocusGain (cause, safePointer, direction); } } void Component::grabKeyboardFocusInternal (FocusChangeType cause, bool canTryParent, FocusChangeDirection direction) { if (! isShowing()) return; if (flags.wantsKeyboardFocusFlag && (isEnabled() || parentComponent == nullptr)) { takeKeyboardFocus (cause, direction); return; } if (isParentOf (currentlyFocusedComponent) && currentlyFocusedComponent->isShowing()) return; if (auto traverser = createKeyboardFocusTraverser()) { if (auto* defaultComp = traverser->getDefaultComponent (this)) { defaultComp->grabKeyboardFocusInternal (cause, false, direction); return; } } // if no children want it and we're allowed to try our parent comp, // then pass up to parent, which will try our siblings. if (canTryParent && parentComponent != nullptr) parentComponent->grabKeyboardFocusInternal (cause, true, direction); } void Component::grabKeyboardFocus() { // if component methods are being called from threads other than the message // thread, you'll need to use a MessageManagerLock object to make sure it's thread-safe. JUCE_ASSERT_MESSAGE_MANAGER_IS_LOCKED grabKeyboardFocusInternal (focusChangedDirectly, true, FocusChangeDirection::unknown); // A component can only be focused when it's actually on the screen! // If this fails then you're probably trying to grab the focus before you've // added the component to a parent or made it visible. Or maybe one of its parent // components isn't yet visible. jassert (isShowing() || isOnDesktop()); } void Component::giveAwayKeyboardFocusInternal (bool sendFocusLossEvent) { if (hasKeyboardFocus (true)) { if (auto* componentLosingFocus = currentlyFocusedComponent) { if (auto* otherPeer = componentLosingFocus->getPeer()) otherPeer->closeInputMethodContext(); currentlyFocusedComponent = nullptr; if (sendFocusLossEvent && componentLosingFocus != nullptr) componentLosingFocus->internalKeyboardFocusLoss (focusChangedDirectly); Desktop::getInstance().triggerFocusCallback(); } } } void Component::giveAwayKeyboardFocus() { // if component methods are being called from threads other than the message // thread, you'll need to use a MessageManagerLock object to make sure it's thread-safe. JUCE_ASSERT_MESSAGE_MANAGER_IS_LOCKED giveAwayKeyboardFocusInternal (true); } void Component::moveKeyboardFocusToSibling (bool moveToNext) { // if component methods are being called from threads other than the message // thread, you'll need to use a MessageManagerLock object to make sure it's thread-safe. JUCE_ASSERT_MESSAGE_MANAGER_IS_LOCKED if (parentComponent != nullptr) { if (auto traverser = createKeyboardFocusTraverser()) { auto findComponentToFocus = [&]() -> Component* { if (auto* comp = (moveToNext ? traverser->getNextComponent (this) : traverser->getPreviousComponent (this))) return comp; if (auto* focusContainer = findKeyboardFocusContainer()) { auto allFocusableComponents = traverser->getAllComponents (focusContainer); if (! allFocusableComponents.empty()) return moveToNext ? allFocusableComponents.front() : allFocusableComponents.back(); } return nullptr; }; if (auto* nextComp = findComponentToFocus()) { if (nextComp->isCurrentlyBlockedByAnotherModalComponent()) { const WeakReference nextCompPointer (nextComp); internalModalInputAttempt(); if (nextCompPointer == nullptr || nextComp->isCurrentlyBlockedByAnotherModalComponent()) return; } nextComp->grabKeyboardFocusInternal (focusChangedByTabKey, true, moveToNext ? FocusChangeDirection::forward : FocusChangeDirection::backward); return; } } parentComponent->moveKeyboardFocusToSibling (moveToNext); } } bool Component::hasKeyboardFocus (bool trueIfChildIsFocused) const { return (currentlyFocusedComponent == this) || (trueIfChildIsFocused && isParentOf (currentlyFocusedComponent)); } Component* JUCE_CALLTYPE Component::getCurrentlyFocusedComponent() noexcept { return currentlyFocusedComponent; } void JUCE_CALLTYPE Component::unfocusAllComponents() { if (currentlyFocusedComponent != nullptr) currentlyFocusedComponent->giveAwayKeyboardFocus(); } //============================================================================== bool Component::isEnabled() const noexcept { return (! flags.isDisabledFlag) && (parentComponent == nullptr || parentComponent->isEnabled()); } void Component::setEnabled (bool shouldBeEnabled) { if (flags.isDisabledFlag == shouldBeEnabled) { flags.isDisabledFlag = ! shouldBeEnabled; // if any parent components are disabled, setting our flag won't make a difference, // so no need to send a change message if (parentComponent == nullptr || parentComponent->isEnabled()) sendEnablementChangeMessage(); BailOutChecker checker (this); componentListeners.callChecked (checker, [this] (ComponentListener& l) { l.componentEnablementChanged (*this); }); if (! shouldBeEnabled && hasKeyboardFocus (true)) { if (parentComponent != nullptr) parentComponent->grabKeyboardFocus(); // ensure that keyboard focus is given away if it wasn't taken by parent giveAwayKeyboardFocus(); } } } void Component::enablementChanged() {} void Component::sendEnablementChangeMessage() { const WeakReference safePointer (this); enablementChanged(); if (safePointer == nullptr) return; for (int i = getNumChildComponents(); --i >= 0;) { if (auto* c = getChildComponent (i)) { c->sendEnablementChangeMessage(); if (safePointer == nullptr) return; } } } //============================================================================== bool Component::isMouseOver (bool includeChildren) const { if (! MessageManager::getInstance()->isThisTheMessageThread()) return flags.cachedMouseInsideComponent; for (auto& ms : Desktop::getInstance().getMouseSources()) { auto* c = ms.getComponentUnderMouse(); if (c != nullptr && (c == this || (includeChildren && isParentOf (c)))) if (ms.isDragging() || ! (ms.isTouch() || ms.isPen())) if (c->reallyContains (c->getLocalPoint (nullptr, ms.getScreenPosition()), false)) return true; } return false; } bool Component::isMouseButtonDown (bool includeChildren) const { for (auto& ms : Desktop::getInstance().getMouseSources()) { auto* c = ms.getComponentUnderMouse(); if (c == this || (includeChildren && isParentOf (c))) if (ms.isDragging()) return true; } return false; } bool Component::isMouseOverOrDragging (bool includeChildren) const { for (auto& ms : Desktop::getInstance().getMouseSources()) { auto* c = ms.getComponentUnderMouse(); if (c == this || (includeChildren && isParentOf (c))) if (ms.isDragging() || ! ms.isTouch()) return true; } return false; } bool JUCE_CALLTYPE Component::isMouseButtonDownAnywhere() noexcept { return ModifierKeys::currentModifiers.isAnyMouseButtonDown(); } Point Component::getMouseXYRelative() const { return getLocalPoint (nullptr, Desktop::getMousePositionFloat()).roundToInt(); } //============================================================================== void Component::addKeyListener (KeyListener* newListener) { if (keyListeners == nullptr) keyListeners.reset (new Array()); keyListeners->addIfNotAlreadyThere (newListener); } void Component::removeKeyListener (KeyListener* listenerToRemove) { if (keyListeners != nullptr) keyListeners->removeFirstMatchingValue (listenerToRemove); } bool Component::keyPressed (const KeyPress&) { return false; } bool Component::keyStateChanged (bool /*isKeyDown*/) { return false; } void Component::modifierKeysChanged (const ModifierKeys& modifiers) { if (parentComponent != nullptr) parentComponent->modifierKeysChanged (modifiers); } void Component::internalModifierKeysChanged() { sendFakeMouseMove(); modifierKeysChanged (ModifierKeys::currentModifiers); } //============================================================================== Component::BailOutChecker::BailOutChecker (Component* component) : safePointer (component) { jassert (component != nullptr); } bool Component::BailOutChecker::shouldBailOut() const noexcept { return safePointer == nullptr; } //============================================================================== void Component::setTitle (const String& newTitle) { componentTitle = newTitle; } void Component::setDescription (const String& newDescription) { componentDescription = newDescription; } void Component::setHelpText (const String& newHelpText) { componentHelpText = newHelpText; } void Component::setAccessible (bool shouldBeAccessible) { flags.accessibilityIgnoredFlag = ! shouldBeAccessible; if (flags.accessibilityIgnoredFlag) invalidateAccessibilityHandler(); } bool Component::isAccessible() const noexcept { return (! flags.accessibilityIgnoredFlag && (parentComponent == nullptr || parentComponent->isAccessible())); } std::unique_ptr Component::createAccessibilityHandler() { return std::make_unique (*this, AccessibilityRole::unspecified); } std::unique_ptr Component::createIgnoredAccessibilityHandler (Component& comp) { return std::make_unique (comp, AccessibilityRole::ignored); } void Component::invalidateAccessibilityHandler() { accessibilityHandler = nullptr; } AccessibilityHandler* Component::getAccessibilityHandler() { if (! isAccessible() || getWindowHandle() == nullptr) return nullptr; if (accessibilityHandler == nullptr || accessibilityHandler->getTypeIndex() != std::type_index (typeid (*this))) { accessibilityHandler = createAccessibilityHandler(); // On Android, notifying that an element was created can cause the system to request // the accessibility node info for the new element. If we're not careful, this will lead // to recursive calls, as each time an element is created, new node info will be requested, // causing an element to be created, causing a new info request... // By assigning the accessibility handler before notifying the system that an element was // created, the if() predicate above should evaluate to false on recursive calls, // terminating the recursion. if (accessibilityHandler != nullptr) detail::AccessibilityHelpers::notifyAccessibilityEvent (*accessibilityHandler, detail::AccessibilityHelpers::Event::elementCreated); else jassertfalse; // createAccessibilityHandler must return non-null } return accessibilityHandler.get(); } } // namespace juce