透明的NSTextView性能 [英] Transparent NSTextView performance

问题描述

我有一个带有NSImage的NSWindow和上面带有长文本的NSTextView http://www.gutenberg.org/cache/epub/100/pg100.txt ，如果我使用纯色背景绘画，则文本编辑会很快.

I have a NSWindow with a NSImage and a NSTextView above it with a long text http://www.gutenberg.org/cache/epub/100/pg100.txt and if I draw with a solid background, the text editing is fast.

但是，如果我没有背景绘制，则[self setDrawsBackground:NO]会非常慢.

But if I draw with no background, [self setDrawsBackground:NO] it's very slow.

有任何更新吗?我也尝试过

Any updates? I have also tried

  [self setDrawsBackground:YES];
    [self setBackgroundColor:[NSColor clearColor]];

也许使用NSTextView的setBackgroundFilters?

Maybe with setBackgroundFilters of NSTextView?

谢谢！

推荐答案

我找到了部分解决方案.如果禁用字体的平滑处理，则性能会提高很多. 首先，您必须具有NSTextView的子类. 然后，

I found a partial solution. If you disable the smoothed of the font, the performance improves a lot. First you must have a subclass of NSTextView. Then,

- (void)drawRect:(NSRect)dirtyRect
{
    [[NSGraphicsContext currentContext] setShouldAntialias:YES];
    CGContextSetShouldAntialias((CGContextRef)[[NSGraphicsContext currentContext] graphicsPort], YES);
    CGContextSetShouldSmoothFonts((CGContextRef)[[NSGraphicsContext currentContext] graphicsPort], NO);

    [super drawRect:dirtyRect];

    // Drawing code here.
}

此外，您可以使用:

self.textview.layoutManager.allowsNonContiguousLayout = YES;

稍微改善性能.

这与具有不透明的背景不同，但有帮助.

This is not the same as having an opaque background, but it helps.

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