Make QWindow update its screen when moved to a different one

Also implements the Cocoa backend for that.

Change-Id: I32977e12a04e1cf48b12333442482746c69ce133
Reviewed-by: Samuel Rødal <samuel.rodal@digia.com>
Reviewed-by: Gunnar Sletta <gunnar.sletta@digia.com>

1 files changed, 15 insertions, 1 deletions

diff --git a/src/plugins/platforms/cocoa/qcocoaapplicationdelegate.mm b/src/plugins/platforms/cocoa/qcocoaapplicationdelegate.mm
index f676d613bc..c40ae3d81d 100644
--- a/src/plugins/platforms/cocoa/qcocoaapplicationdelegate.mm
+++ b/src/plugins/platforms/cocoa/qcocoaapplicationdelegate.mm
@@ -100,11 +100,23 @@ static void cleanupCocoaApplicationDelegate()
 - (id)init
 {
     self = [super init];
-    if (self)
+    if (self) {
         inLaunch = true;
+        [[NSNotificationCenter defaultCenter]
+                addObserver:self
+                   selector:@selector(updateScreens:)
+                       name:NSApplicationDidChangeScreenParametersNotification
+                     object:NSApp];
+    }
     return self;
 }
 
+- (void)updateScreens:(NSNotification *)notification
+{
+    if (QCocoaIntegration *ci = dynamic_cast<QCocoaIntegration *>(QGuiApplicationPrivate::platformIntegration()))
+        ci->updateScreens();
+}
+
 - (void)dealloc
 {
     sharedCocoaApplicationDelegate = nil;
@@ -114,6 +126,8 @@ static void cleanupCocoaApplicationDelegate()
         [NSApp setDelegate:reflectionDelegate];
         [reflectionDelegate release];
     }
+    [[NSNotificationCenter defaultCenter] removeObserver:self];
+
     [super dealloc];
 }