NSTabView Item 在 TabViewItem 中添加图标

发布于 2024-10-26 21:16:45 字数 350 浏览 1 评论 0原文

我对 NSTabView 进行了子类化并添加了 5 个 TabViewItem，现在我想在 NSTabViewItem 中添加一个图标和标题，任何人都可以建议我如何开始，我没有得到任何文档，除了，

- (void)drawLabel:(BOOL)shouldTruncateLabel inRect:(NSRect)tabRect

这是否意味着，如果我重写此方法，我需要绘制自己的图标和字符串，

为了设置标题，我正在使用以下方法，

[pTabViewItem setLabel:pLabelTitle];

亲切的问候
罗汉

原文

I subclassed NSTabView and added 5 TabViewItem, now i wanted to add an Icon along with the title in the NSTabViewItem,
Can anyone suggest me how to start, i am not getting any documentation except,

- (void)drawLabel:(BOOL)shouldTruncateLabel inRect:(NSRect)tabRect

Does that mean, if i override this method, i need to draw Icon and string my own,

For setting up the title , i am using following method,

[pTabViewItem setLabel:pLabelTitle];

Kind Regards
Rohan

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沫雨熙 2024-11-02 21:16:45

没关系，
以下代码对我有用，

- (void)drawLabel:(BOOL)shouldTruncateLabel inRect:(NSRect)tabRect{

    // do we have an image to draw
    NSImage *pImage = [pDelegate imageForCell];

    [[NSGraphicsContext currentContext] saveGraphicsState];
    NSAffineTransform* xform = [NSAffineTransform transform];
    [xform translateXBy:0.0 yBy: tabRect.size.height];
    [xform scaleXBy:1.0 yBy:-1.0];
    [xform concat]; 


    CGFloat x_Offset =0;
    if(pImage){
        [pImage drawInRect:NSMakeRect(tabRect.origin.x-8,-6,16, 16)fromRect:NSZeroRect
                 operation:NSCompositeSourceOver
                  fraction:1.0];
        x_Offset =  16;
    }
     [[NSGraphicsContext currentContext] restoreGraphicsState];

    [super drawLabel:shouldTruncateLabel inRect:tabRect];
}

为什么要进行转换：
图像显示倒置，所以我需要变换，

为什么偏移：
即使在转换之后，我也需要调整位置，使其看起来就在标题之前，

伙计们，我在设置标题时，

附加一个空格，这样标题就不会与图像重叠，我知道这是丑陋的方法，但不能没有任何其他快速方法来做到这一点，如果我自己绘制文本那么我还需要注意截断，

感谢那些查看问题和答案的人
亲切的问候
罗汉

Never Mind,
Following Code works for me,

- (void)drawLabel:(BOOL)shouldTruncateLabel inRect:(NSRect)tabRect{

    // do we have an image to draw
    NSImage *pImage = [pDelegate imageForCell];

    [[NSGraphicsContext currentContext] saveGraphicsState];
    NSAffineTransform* xform = [NSAffineTransform transform];
    [xform translateXBy:0.0 yBy: tabRect.size.height];
    [xform scaleXBy:1.0 yBy:-1.0];
    [xform concat]; 


    CGFloat x_Offset =0;
    if(pImage){
        [pImage drawInRect:NSMakeRect(tabRect.origin.x-8,-6,16, 16)fromRect:NSZeroRect
                 operation:NSCompositeSourceOver
                  fraction:1.0];
        x_Offset =  16;
    }
     [[NSGraphicsContext currentContext] restoreGraphicsState];

    [super drawLabel:shouldTruncateLabel inRect:tabRect];
}

Why transformation:
Image was showing inverted, so i need to transform,

Why offset:
Even after transformation, i need to adjust, the position so that it looks just before the title,

and guys, i while setting the title,

append a Space, so title will not overlap the image, i know this is ugly approach, but couldn’t get any other quick way to do it, if i draw the text myself then i need to take care of truncating also,

Thanks to those who looked at questions and answer
Kind Regards
Rohan

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