Make NSWindow with transparent titlebar partly unmovable - objective-c

Question

I have a NSWindow with a splitted screen like in Reminders. Therefore I use this code:
self.window.titlebarAppearsTransparent = true
self.window.styleMask |= NSFullSizeContentViewWindowMask
This works perfectly. But inside the window I have a SplitView (like in the Reminders App) and a NSOutlineView at the right side. The OutlineView goes up to the top of the window corner.
The problem now is: Clicking and dragging at the top of the OutlineView makes the window movable. Any way, I can disable this but still keeping the moving ability at the left side of the app?

Answer 1

Ok, there are two things you need to do:
First you need to set your window to be not movable. To do so, subclass your Window and override isMovable and return no. Or you call setMovable: and set it to no.
After that, you have to manually reenable dragging by adding a view that has the exact size and position of the area you want to draggable. Alternatively you can set up a NSTrackingArea.
Either way, you need to override mouseDown: and insert some code to move the window.
My words in code:
Objective-C
[self.window setMovable:false];
// OR (in NSWindow subclass)
- (BOOL)isMovable {
return false;
}
//Mouse Down
- (void)mouseDown:(NSEvent *)theEvent {
_initialLocation = [theEvent locationInWindow];
NSPoint point;
while (1) {
theEvent = [[self window] nextEventMatchingMask: (NSLeftMouseDraggedMask | NSLeftMouseUpMask)];
point =[theEvent locationInWindow];
NSRect screenVisibleFrame = [[NSScreen mainScreen] visibleFrame];
NSRect windowFrame = [self.window frame];
NSPoint newOrigin = windowFrame.origin;
// Get the mouse location in window coordinates.
NSPoint currentLocation = point;
// Update the origin with the difference between the new mouse location and the old mouse location.
newOrigin.x += (currentLocation.x - _initialLocation.x);
newOrigin.y += (currentLocation.y - _initialLocation.y);
// Don't let window get dragged up under the menu bar
if ((newOrigin.y + windowFrame.size.height) > (screenVisibleFrame.origin.y + screenVisibleFrame.size.height)) {
newOrigin.y = screenVisibleFrame.origin.y + (screenVisibleFrame.size.height - windowFrame.size.height);
}
// Move the window to the new location
[self.window setFrameOrigin:newOrigin];
if ([theEvent type] == NSLeftMouseUp) {
break;
}
}
}
initialLocation is a NSPoint property
Note: I looked up some things here and here