Draw during resizing on MacOS

Unfortunately drawing still stalls if the user just grabs the resize handle
until the first resize event happens, but it seems to be impossible to fix this
without using another thread.

1 files changed, 32 insertions, 2 deletions

diff --git a/pugl/pugl_osx.m b/pugl/pugl_osx.m
index 3b6919d..273002a 100644
--- a/pugl/pugl_osx.m
+++ b/pugl/pugl_osx.m
@@ -115,9 +115,9 @@ struct PuglInternalsImpl {
 @interface PuglOpenGLView : NSOpenGLView
 {
 @public
-	PuglView* puglview;
-
+	PuglView*       puglview;
 	NSTrackingArea* trackingArea;
+	NSTimer*        timer;
 }
 
 - (id) initWithFrame:(NSRect)frame;
@@ -537,6 +537,36 @@ keySymToSpecial(PuglView* view, NSEvent* ev)
 	puglview->impl->mods = mods;
 }
 
+- (BOOL) preservesContentInLiveResize
+{
+	return NO;
+}
+
+- (void) viewWillStartLiveResize
+{
+	timer = [NSTimer timerWithTimeInterval:(1 / 60.0)
+	                                target:self
+	                              selector:@selector(resizeTick)
+	                              userInfo:nil
+	                               repeats:YES];
+	[[NSRunLoop currentRunLoop] addTimer:timer
+	                             forMode:NSRunLoopCommonModes];
+
+	[super viewWillStartLiveResize];
+}
+
+- (void) resizeTick
+{
+	puglPostRedisplay(puglview);
+}
+
+- (void) viewDidEndLiveResize
+{
+	[super viewDidEndLiveResize];
+	[timer invalidate];
+	timer = NULL;
+}
+
 @end
 
 PuglInternals*