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juce_mac_NSViewComponent.mm
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juce_mac_NSViewComponent.mm
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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.
==============================================================================
*/
struct NSViewResizeWatcher
{
NSViewResizeWatcher() : callback (nil) {}
virtual ~NSViewResizeWatcher()
{
// must call detachViewWatcher() first
jassert (callback == nil);
}
void attachViewWatcher (NSView* view)
{
static ViewFrameChangeCallbackClass cls;
callback = [cls.createInstance() init];
ViewFrameChangeCallbackClass::setTarget (callback, this);
[[NSNotificationCenter defaultCenter] addObserver: callback
selector: @selector (frameChanged:)
name: NSViewFrameDidChangeNotification
object: view];
}
void detachViewWatcher()
{
if (callback != nil)
{
[[NSNotificationCenter defaultCenter] removeObserver: callback];
[callback release];
callback = nil;
}
}
virtual void viewResized() = 0;
private:
id callback;
//==============================================================================
struct ViewFrameChangeCallbackClass : public ObjCClass<NSObject>
{
ViewFrameChangeCallbackClass() : ObjCClass<NSObject> ("JUCE_NSViewCallback_")
{
addIvar<NSViewResizeWatcher*> ("target");
addMethod (@selector (frameChanged:), frameChanged, "v@:@");
registerClass();
}
static void setTarget (id self, NSViewResizeWatcher* c)
{
object_setInstanceVariable (self, "target", c);
}
private:
static void frameChanged (id self, SEL, NSNotification*)
{
if (NSViewResizeWatcher* const target = getIvar<NSViewResizeWatcher*> (self, "target"))
target->viewResized();
}
JUCE_DECLARE_NON_COPYABLE (ViewFrameChangeCallbackClass)
};
JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (NSViewResizeWatcher)
};
//==============================================================================
class NSViewAttachment : public ReferenceCountedObject,
public ComponentMovementWatcher,
private NSViewResizeWatcher
{
public:
NSViewAttachment (NSView* const v, Component& comp)
: ComponentMovementWatcher (&comp),
view (v), owner (comp),
currentPeer (nullptr)
{
[view retain];
[view setPostsFrameChangedNotifications: YES];
updateAlpha();
if (owner.isShowing())
componentPeerChanged();
attachViewWatcher (view);
}
~NSViewAttachment()
{
detachViewWatcher();
removeFromParent();
[view release];
}
void componentMovedOrResized (Component& comp, bool wasMoved, bool wasResized) override
{
ComponentMovementWatcher::componentMovedOrResized (comp, wasMoved, wasResized);
// The ComponentMovementWatcher version of this method avoids calling
// us when the top-level comp is resized, but for an NSView we need to know this
// because with inverted coordinates, we need to update the position even if the
// top-left pos hasn't changed
if (comp.isOnDesktop() && wasResized)
componentMovedOrResized (wasMoved, wasResized);
}
void componentMovedOrResized (bool /*wasMoved*/, bool /*wasResized*/) override
{
if (ComponentPeer* const peer = owner.getTopLevelComponent()->getPeer())
{
NSRect r = makeNSRect (peer->getAreaCoveredBy (owner));
r.origin.y = [[view superview] frame].size.height - (r.origin.y + r.size.height);
[view setFrame: r];
}
}
void componentPeerChanged() override
{
ComponentPeer* const peer = owner.getPeer();
if (currentPeer != peer)
{
currentPeer = peer;
if (peer != nullptr)
{
NSView* const peerView = (NSView*) peer->getNativeHandle();
[peerView addSubview: view];
componentMovedOrResized (false, false);
}
else
{
removeFromParent();
}
}
[view setHidden: ! owner.isShowing()];
}
void componentVisibilityChanged() override
{
componentPeerChanged();
}
void viewResized() override
{
owner.childBoundsChanged (nullptr);
}
void updateAlpha()
{
[view setAlphaValue: (CGFloat) owner.getAlpha()];
}
NSView* const view;
private:
Component& owner;
ComponentPeer* currentPeer;
void removeFromParent()
{
if ([view superview] != nil)
[view removeFromSuperview]; // Must be careful not to call this unless it's required - e.g. some Apple AU views
// override the call and use it as a sign that they're being deleted, which breaks everything..
}
JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (NSViewAttachment)
};
//==============================================================================
NSViewComponent::NSViewComponent() {}
NSViewComponent::~NSViewComponent() {}
void NSViewComponent::setView (void* const view)
{
if (view != getView())
{
attachment = nullptr;
if (view != nullptr)
attachment = attachViewToComponent (*this, view);
}
}
void* NSViewComponent::getView() const
{
return attachment != nullptr ? static_cast<NSViewAttachment*> (attachment.get())->view
: nullptr;
}
void NSViewComponent::resizeToFitView()
{
if (attachment != nullptr)
{
NSRect r = [static_cast<NSViewAttachment*> (attachment.get())->view frame];
setBounds (Rectangle<int> ((int) r.size.width, (int) r.size.height));
}
}
void NSViewComponent::paint (Graphics&) {}
void NSViewComponent::alphaChanged()
{
if (attachment != nullptr)
(static_cast<NSViewAttachment*> (attachment.get()))->updateAlpha();
}
ReferenceCountedObject* NSViewComponent::attachViewToComponent (Component& comp, void* const view)
{
return new NSViewAttachment ((NSView*) view, comp);
}