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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.
==============================================================================
*/
ComponentMovementWatcher::ComponentMovementWatcher (Component* const comp)
: component (comp),
lastPeerID (0),
reentrant (false),
wasShowing (comp->isShowing())
{
jassert (component != nullptr); // can't use this with a null pointer..
component->addComponentListener (this);
registerWithParentComps();
}
ComponentMovementWatcher::~ComponentMovementWatcher()
{
if (component != nullptr)
component->removeComponentListener (this);
unregister();
}
//==============================================================================
void ComponentMovementWatcher::componentParentHierarchyChanged (Component&)
{
if (component != nullptr && ! reentrant)
{
const ScopedValueSetter<bool> setter (reentrant, true);
ComponentPeer* const peer = component->getPeer();
const uint32 peerID = peer != nullptr ? peer->getUniqueID() : 0;
if (peerID != lastPeerID)
{
componentPeerChanged();
if (component == nullptr)
return;
lastPeerID = peerID;
}
unregister();
registerWithParentComps();
componentMovedOrResized (*component, true, true);
if (component != nullptr)
componentVisibilityChanged (*component);
}
}
void ComponentMovementWatcher::componentMovedOrResized (Component&, bool wasMoved, bool wasResized)
{
if (component != nullptr)
{
if (wasMoved)
{
Point<int> newPos;
Component* const top = component->getTopLevelComponent();
if (top != component)
newPos = top->getLocalPoint (component, Point<int>());
else
newPos = top->getPosition();
wasMoved = lastBounds.getPosition() != newPos;
lastBounds.setPosition (newPos);
}
wasResized = (lastBounds.getWidth() != component->getWidth() || lastBounds.getHeight() != component->getHeight());
lastBounds.setSize (component->getWidth(), component->getHeight());
if (wasMoved || wasResized)
componentMovedOrResized (wasMoved, wasResized);
}
}
void ComponentMovementWatcher::componentBeingDeleted (Component& comp)
{
registeredParentComps.removeFirstMatchingValue (&comp);
if (component == &comp)
unregister();
}
void ComponentMovementWatcher::componentVisibilityChanged (Component&)
{
if (component != nullptr)
{
const bool isShowingNow = component->isShowing();
if (wasShowing != isShowingNow)
{
wasShowing = isShowingNow;
componentVisibilityChanged();
}
}
}
void ComponentMovementWatcher::registerWithParentComps()
{
for (Component* p = component->getParentComponent(); p != nullptr; p = p->getParentComponent())
{
p->addComponentListener (this);
registeredParentComps.add (p);
}
}
void ComponentMovementWatcher::unregister()
{
for (int i = registeredParentComps.size(); --i >= 0;)
registeredParentComps.getUnchecked(i)->removeComponentListener (this);
registeredParentComps.clear();
}
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