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/*
==============================================================================
This file is part of the JUCE library.
Copyright (c) 2015 - ROLI Ltd.
Permission is granted to use this software under the terms of either:
a) the GPL v2 (or any later version)
b) the Affero GPL v3
Details of these licenses can be found at: www.gnu.org/licenses
JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
------------------------------------------------------------------------------
To release a closed-source product which uses JUCE, commercial licenses are
available: visit www.juce.com for more information.
==============================================================================
*/
class DropShadower::ShadowWindow : public Component
{
public:
ShadowWindow (Component* comp, const DropShadow& ds)
: target (comp), shadow (ds)
{
setVisible (true);
setInterceptsMouseClicks (false, false);
if (comp->isOnDesktop())
{
setSize (1, 1); // to keep the OS happy by not having zero-size windows
addToDesktop (ComponentPeer::windowIgnoresMouseClicks
| ComponentPeer::windowIsTemporary
| ComponentPeer::windowIgnoresKeyPresses);
}
else if (Component* const parent = comp->getParentComponent())
{
parent->addChildComponent (this);
}
}
void paint (Graphics& g) override
{
if (Component* c = target)
shadow.drawForRectangle (g, getLocalArea (c, c->getLocalBounds()));
}
void resized() override
{
repaint(); // (needed for correct repainting)
}
float getDesktopScaleFactor() const override
{
if (target != nullptr)
return target->getDesktopScaleFactor();
return Component::getDesktopScaleFactor();
}
private:
WeakReference<Component> target;
DropShadow shadow;
JUCE_DECLARE_NON_COPYABLE (ShadowWindow)
};
//==============================================================================
DropShadower::DropShadower (const DropShadow& ds)
: owner (nullptr), shadow (ds), reentrant (false)
{
}
DropShadower::~DropShadower()
{
if (owner != nullptr)
{
owner->removeComponentListener (this);
owner = nullptr;
}
updateParent();
reentrant = true;
shadowWindows.clear();
}
void DropShadower::setOwner (Component* componentToFollow)
{
if (componentToFollow != owner)
{
if (owner != nullptr)
owner->removeComponentListener (this);
// (the component can't be null)
jassert (componentToFollow != nullptr);
owner = componentToFollow;
jassert (owner != nullptr);
updateParent();
owner->addComponentListener (this);
updateShadows();
}
}
void DropShadower::updateParent()
{
if (Component* p = lastParentComp)
p->removeComponentListener (this);
lastParentComp = owner != nullptr ? owner->getParentComponent() : nullptr;
if (Component* p = lastParentComp)
p->addComponentListener (this);
}
void DropShadower::componentMovedOrResized (Component& c, bool /*wasMoved*/, bool /*wasResized*/)
{
if (owner == &c)
updateShadows();
}
void DropShadower::componentBroughtToFront (Component& c)
{
if (owner == &c)
updateShadows();
}
void DropShadower::componentChildrenChanged (Component&)
{
updateShadows();
}
void DropShadower::componentParentHierarchyChanged (Component& c)
{
if (owner == &c)
{
updateParent();
updateShadows();
}
}
void DropShadower::componentVisibilityChanged (Component& c)
{
if (owner == &c)
updateShadows();
}
void DropShadower::updateShadows()
{
if (reentrant)
return;
const ScopedValueSetter<bool> setter (reentrant, true, false);
if (owner == nullptr)
{
shadowWindows.clear();
return;
}
if (owner->isShowing()
&& owner->getWidth() > 0 && owner->getHeight() > 0
&& (Desktop::canUseSemiTransparentWindows() || owner->getParentComponent() != nullptr))
{
while (shadowWindows.size() < 4)
shadowWindows.add (new ShadowWindow (owner, shadow));
const int shadowEdge = jmax (shadow.offset.x, shadow.offset.y) + shadow.radius;
const int x = owner->getX();
const int y = owner->getY() - shadowEdge;
const int w = owner->getWidth();
const int h = owner->getHeight() + shadowEdge + shadowEdge;
for (int i = 4; --i >= 0;)
{
// there seem to be rare situations where the dropshadower may be deleted by
// callbacks during this loop, so use a weak ref to watch out for this..
WeakReference<Component> sw (shadowWindows[i]);
if (sw != nullptr)
sw->setAlwaysOnTop (owner->isAlwaysOnTop());
if (sw != nullptr)
{
switch (i)
{
case 0: sw->setBounds (x - shadowEdge, y, shadowEdge, h); break;
case 1: sw->setBounds (x + w, y, shadowEdge, h); break;
case 2: sw->setBounds (x, y, w, shadowEdge); break;
case 3: sw->setBounds (x, owner->getBottom(), w, shadowEdge); break;
default: break;
}
}
if (sw != nullptr)
sw->toBehind (i == 3 ? owner : shadowWindows.getUnchecked (i + 1));
if (sw == nullptr)
return;
}
}
else
{
shadowWindows.clear();
}
}
|
