mirror of
https://github.com/juce-framework/JUCE.git
synced 2026-01-10 23:44:24 +00:00
409 lines
13 KiB
C++
409 lines
13 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE framework.
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Copyright (c) Raw Material Software Limited
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JUCE is an open source framework subject to commercial or open source
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licensing.
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By downloading, installing, or using the JUCE framework, or combining the
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JUCE framework with any other source code, object code, content or any other
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copyrightable work, you agree to the terms of the JUCE End User Licence
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Agreement, and all incorporated terms including the JUCE Privacy Policy and
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the JUCE Website Terms of Service, as applicable, which will bind you. If you
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do not agree to the terms of these agreements, we will not license the JUCE
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framework to you, and you must discontinue the installation or download
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process and cease use of the JUCE framework.
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JUCE End User Licence Agreement: https://juce.com/legal/juce-8-licence/
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JUCE Privacy Policy: https://juce.com/juce-privacy-policy
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JUCE Website Terms of Service: https://juce.com/juce-website-terms-of-service/
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Or:
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You may also use this code under the terms of the AGPLv3:
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https://www.gnu.org/licenses/agpl-3.0.en.html
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THE JUCE FRAMEWORK IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL
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WARRANTIES, WHETHER EXPRESSED OR IMPLIED, INCLUDING WARRANTY OF
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MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE DISCLAIMED.
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==============================================================================
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*/
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namespace juce
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{
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class DropShadower::ShadowWindow final : public Component
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{
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public:
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ShadowWindow (Component* comp, const DropShadow& ds)
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: target (comp), shadow (ds)
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{
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setVisible (true);
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setAccessible (false);
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setInterceptsMouseClicks (false, false);
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if (comp->isOnDesktop())
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{
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#if JUCE_WINDOWS
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const auto scope = [&]() -> std::optional<ScopedThreadDPIAwarenessSetter>
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{
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if (comp != nullptr)
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if (auto* handle = comp->getWindowHandle())
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return ScopedThreadDPIAwarenessSetter (handle);
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return {};
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}();
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#endif
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setSize (1, 1); // to keep the OS happy by not having zero-size windows
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addToDesktop (ComponentPeer::windowIgnoresMouseClicks
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| ComponentPeer::windowIsTemporary
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| ComponentPeer::windowIgnoresKeyPresses);
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}
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else if (Component* const parent = comp->getParentComponent())
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{
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parent->addChildComponent (this);
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}
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}
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void paint (Graphics& g) override
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{
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if (Component* c = target)
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shadow.drawForRectangle (g, getLocalArea (c, c->getLocalBounds()));
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}
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void resized() override
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{
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repaint(); // (needed for correct repainting)
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}
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float getDesktopScaleFactor() const override
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{
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if (target != nullptr)
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return target->getDesktopScaleFactor();
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return Component::getDesktopScaleFactor();
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}
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private:
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WeakReference<Component> target;
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DropShadow shadow;
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JUCE_DECLARE_NON_COPYABLE (ShadowWindow)
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};
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class DropShadower::VirtualDesktopWatcher final : public ComponentListener,
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private Timer
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{
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public:
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//==============================================================================
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VirtualDesktopWatcher (Component& c) : component (&c)
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{
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component->addComponentListener (this);
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update();
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}
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~VirtualDesktopWatcher() override
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{
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stopTimer();
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if (auto* c = component.get())
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c->removeComponentListener (this);
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}
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bool shouldHideDropShadow() const
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{
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return hasReasonToHide;
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}
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void addListener (void* listener, std::function<void()> cb)
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{
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listeners[listener] = std::move (cb);
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}
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void removeListener (void* listener)
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{
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listeners.erase (listener);
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}
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//==============================================================================
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void componentParentHierarchyChanged (Component& c) override
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{
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if (component.get() == &c)
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update();
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}
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private:
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//==============================================================================
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void update()
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{
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bool newHasReasonToHide = false;
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if (! component.wasObjectDeleted() && isWindows && component->isOnDesktop())
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{
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startTimerHz (5);
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WeakReference<VirtualDesktopWatcher> weakThis (this);
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// During scaling changes this call can trigger a call to HWNDComponentPeer::handleDPIChanging()
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// which deletes this VirtualDesktopWatcher.
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newHasReasonToHide = ! detail::WindowingHelpers::isWindowOnCurrentVirtualDesktop (component->getWindowHandle());
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if (weakThis == nullptr)
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return;
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}
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else
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{
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stopTimer();
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}
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if (std::exchange (hasReasonToHide, newHasReasonToHide) != newHasReasonToHide)
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for (auto& l : listeners)
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l.second();
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}
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void timerCallback() override
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{
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update();
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}
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//==============================================================================
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WeakReference<Component> component;
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const bool isWindows = (SystemStats::getOperatingSystemType() & SystemStats::Windows) != 0;
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bool hasReasonToHide = false;
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std::map<void*, std::function<void()>> listeners;
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JUCE_DECLARE_WEAK_REFERENCEABLE (VirtualDesktopWatcher)
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JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (VirtualDesktopWatcher)
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};
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class DropShadower::ParentVisibilityChangedListener final : public ComponentListener
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{
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public:
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ParentVisibilityChangedListener (Component& r, ComponentListener& l)
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: root (&r), listener (&l)
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{
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updateParentHierarchy();
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}
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~ParentVisibilityChangedListener() override
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{
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for (auto& compEntry : observedComponents)
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if (auto* comp = compEntry.get())
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comp->removeComponentListener (this);
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}
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void componentVisibilityChanged (Component& component) override
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{
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if (root != &component)
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listener->componentVisibilityChanged (*root);
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}
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void componentParentHierarchyChanged (Component& component) override
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{
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if (root == &component)
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updateParentHierarchy();
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}
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private:
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class ComponentWithWeakReference
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{
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public:
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explicit ComponentWithWeakReference (Component& c)
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: ptr (&c), ref (&c) {}
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Component* get() const { return ref.get(); }
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bool operator< (const ComponentWithWeakReference& other) const { return ptr < other.ptr; }
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private:
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Component* ptr;
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WeakReference<Component> ref;
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};
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void updateParentHierarchy()
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{
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const auto lastSeenComponents = std::exchange (observedComponents, [&]
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{
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std::set<ComponentWithWeakReference> result;
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for (auto node = root; node != nullptr; node = node->getParentComponent())
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result.emplace (*node);
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return result;
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}());
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const auto withDifference = [] (const auto& rangeA, const auto& rangeB, auto&& callback)
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{
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std::vector<ComponentWithWeakReference> result;
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std::set_difference (rangeA.begin(), rangeA.end(), rangeB.begin(), rangeB.end(), std::back_inserter (result));
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for (const auto& item : result)
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if (auto* c = item.get())
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callback (*c);
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};
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withDifference (lastSeenComponents, observedComponents, [this] (auto& comp) { comp.removeComponentListener (this); });
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withDifference (observedComponents, lastSeenComponents, [this] (auto& comp) { comp.addComponentListener (this); });
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}
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Component* root = nullptr;
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ComponentListener* listener = nullptr;
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std::set<ComponentWithWeakReference> observedComponents;
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JUCE_DECLARE_NON_COPYABLE (ParentVisibilityChangedListener)
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JUCE_DECLARE_NON_MOVEABLE (ParentVisibilityChangedListener)
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};
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//==============================================================================
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DropShadower::DropShadower (const DropShadow& ds) : shadow (ds) {}
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DropShadower::~DropShadower()
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{
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if (virtualDesktopWatcher != nullptr)
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virtualDesktopWatcher->removeListener (this);
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if (owner != nullptr)
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{
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owner->removeComponentListener (this);
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owner = nullptr;
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}
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updateParent();
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const ScopedValueSetter<bool> setter (reentrant, true);
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shadowWindows.clear();
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}
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void DropShadower::setOwner (Component* componentToFollow)
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{
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if (componentToFollow != owner)
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{
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if (owner != nullptr)
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owner->removeComponentListener (this);
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// (the component can't be null)
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jassert (componentToFollow != nullptr);
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owner = componentToFollow;
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jassert (owner != nullptr);
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updateParent();
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owner->addComponentListener (this);
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// The visibility of `owner` is transitively affected by the visibility of its parents. Thus we need to trigger the
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// componentVisibilityChanged() event in case it changes for any of the parents.
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visibilityChangedListener = std::make_unique<ParentVisibilityChangedListener> (*owner,
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static_cast<ComponentListener&> (*this));
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virtualDesktopWatcher = std::make_unique<VirtualDesktopWatcher> (*owner);
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virtualDesktopWatcher->addListener (this, [this]() { updateShadows(); });
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updateShadows();
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}
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}
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void DropShadower::updateParent()
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{
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if (Component* p = lastParentComp)
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p->removeComponentListener (this);
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lastParentComp = owner != nullptr ? owner->getParentComponent() : nullptr;
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if (Component* p = lastParentComp)
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p->addComponentListener (this);
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}
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void DropShadower::componentMovedOrResized (Component& c, bool /*wasMoved*/, bool /*wasResized*/)
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{
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if (owner == &c)
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updateShadows();
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}
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void DropShadower::componentBroughtToFront (Component& c)
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{
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if (owner == &c)
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updateShadows();
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}
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void DropShadower::componentChildrenChanged (Component&)
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{
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updateShadows();
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}
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void DropShadower::componentParentHierarchyChanged (Component& c)
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{
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if (owner == &c)
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{
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updateParent();
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updateShadows();
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}
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}
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void DropShadower::componentVisibilityChanged (Component& c)
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{
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if (owner == &c)
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updateShadows();
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}
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void DropShadower::updateShadows()
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{
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if (reentrant)
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return;
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const ScopedValueSetter<bool> setter (reentrant, true);
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if (owner != nullptr
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&& owner->isShowing()
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&& owner->getWidth() > 0 && owner->getHeight() > 0
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&& (Desktop::canUseSemiTransparentWindows() || owner->getParentComponent() != nullptr)
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&& (virtualDesktopWatcher == nullptr || ! virtualDesktopWatcher->shouldHideDropShadow()))
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{
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while (shadowWindows.size() < 4)
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shadowWindows.add (new ShadowWindow (owner, shadow));
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const int shadowEdge = jmax (shadow.offset.x, shadow.offset.y) + shadow.radius;
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const int x = owner->getX();
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const int y = owner->getY() - shadowEdge;
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const int w = owner->getWidth();
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const int h = owner->getHeight() + shadowEdge + shadowEdge;
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for (int i = 4; --i >= 0;)
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{
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// there seem to be rare situations where the dropshadower may be deleted by
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// callbacks during this loop, so use a weak ref to watch out for this
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WeakReference<Component> sw (shadowWindows[i]);
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if (sw != nullptr)
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{
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sw->setAlwaysOnTop (owner->isAlwaysOnTop());
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if (sw == nullptr)
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return;
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switch (i)
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{
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case 0: sw->setBounds (x - shadowEdge, y, shadowEdge, h); break;
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case 1: sw->setBounds (x + w, y, shadowEdge, h); break;
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case 2: sw->setBounds (x, y, w, shadowEdge); break;
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case 3: sw->setBounds (x, owner->getBottom(), w, shadowEdge); break;
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default: break;
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}
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if (sw == nullptr)
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return;
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sw->toBehind (i == 3 ? owner.get() : shadowWindows.getUnchecked (i + 1));
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}
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}
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}
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else
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{
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shadowWindows.clear();
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}
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}
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} // namespace juce
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