CODEWITHSUNDEEP
cocoatransparentnssplitviewnscolor
Kyle
Kyle

Reputation: 17677

How to make an NSSplitView transparent without having the splitter disappear?

I've extended my window so that it has a button content border. The problem is that my NSSplitView covers the border. My thoughts were that I could make the split view transparent (but the controls on top of it opaque).

The following image shows what I am looking for, but with the missing splitter:

Screenshot with missing splitter

See how the bottom of the window has the button on it. This is the effect I am trying to achieve, but without any luck. The code that I am attempting to use is:

CALayer *transparentViewLayer = [CALayer layer];
[viewLayer setBackgroundColor:CGColorCreateGenericRGB(
                                                      256.0,
                                                      256.0,
                                                      256.0,
                                                      0)]; //RGB plus Alpha Channel
[splitView setWantsLayer:YES]; // view's backing store is using a Core Animation Layer
[splitView setLayer: transparentViewLayer];

If I do NOT set the transparentViewLayer, then I end up with the following:

Splitter but hidden bottom bar

Which shows the spitter, but hides the windows bottom bar. I have also tried subclassing NSSplitView and adding the following:

- (void) drawRect: (NSRect) dirtyRect
{
    [[NSColor colorWithSRGBRed: 0.0 green: 255.0 blue: 0.0 alpha: 155.0] setFill];
    NSRectFill(dirtyRect);
} // End of drawRect

Which left me with a green splitter and no alpha for the windows bottom bar. Any ideas on how I can achieve the effect I am looking for? (I want the bottom bar with my buttons and the splitter visible).

Upvotes: 0

Views: 890

Answers (1)

Joshua Nozzi
Joshua Nozzi

Reputation: 61228

In your subclass, don't override -[NSSplitView drawRect:]. Instead, override -drawDividerInRect: and draw your divider ONLY in that rect. Always consult the documentation first when you want to "bend" a class to your will.

Upvotes: 0

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