调整大小NSImage中定制NSTextFieldCell

问题描述：

我创造了阻力和使用苹果的例子下降应用：https://developer.apple.com/library/mac/samplecode/SourceView/Introduction/Intro.html 调整大小NSImage中定制NSTextFieldCell

我拖着加载文件的实际图像。

当我拖累例如该 enter image description here 图像文件到我NSOutlineView，我看到它以这种方式调整：

enter image description here

我作为是没有任何修改苹果的ImageAndTextCell类自定义NSTextFieldCell。

我如何调整此图像以适合比例单元矩形？

请检查此链接：http://theocacao.com/document.page/498 –

我试了一下，但是当我修改方法 - （无效）drawWithFrame：（的NSRect）cellFrame inView：（*的NSView）在ImageAndTextCell.m类中的controlView到NSImage * resizedImage = [self.myImage imageByScalingProportionallyToSize：....我有相同的结果，没有任何更改.. – KAMIKAZE

基于单元格的表已弃用。我建议你制作基于表格的视图，然后你可以在每行/列中绘制任何你喜欢的东西。 –

答

完美的作品。

@implementation NSImage (ProportionalScaling) 

- (NSImage*)imageByScalingProportionallyToSize:(NSSize)targetSize 
{ 
    NSImage* sourceImage = self; 
    NSImage* newImage = nil; 

    if ([sourceImage isValid]) 
    { 
    NSSize imageSize = [sourceImage size]; 
    float width = imageSize.width; 
    float height = imageSize.height; 

    float targetWidth = targetSize.width; 
    float targetHeight = targetSize.height; 

    float scaleFactor = 0.0; 
    float scaledWidth = targetWidth; 
    float scaledHeight = targetHeight; 

    NSPoint thumbnailPoint = NSZeroPoint; 

    if (NSEqualSizes(imageSize, targetSize) == NO) 
    { 

     float widthFactor = targetWidth/width; 
     float heightFactor = targetHeight/height; 

     if (widthFactor < heightFactor) 
     scaleFactor = widthFactor; 
     else 
     scaleFactor = heightFactor; 

     scaledWidth = width * scaleFactor; 
     scaledHeight = height * scaleFactor; 

     if (widthFactor < heightFactor) 
     thumbnailPoint.y = (targetHeight - scaledHeight) * 0.5; 

     else if (widthFactor > heightFactor) 
     thumbnailPoint.x = (targetWidth - scaledWidth) * 0.5; 
    } 

    newImage = [[NSImage alloc] initWithSize:targetSize]; 

    [newImage lockFocus]; 

     NSRect thumbnailRect; 
     thumbnailRect.origin = thumbnailPoint; 
     thumbnailRect.size.width = scaledWidth; 
     thumbnailRect.size.height = scaledHeight; 

     [sourceImage drawInRect: thumbnailRect 
        fromRect: NSZeroRect 
        operation: NSCompositeSourceOver 
        fraction: 1.0]; 

    [newImage unlockFocus]; 

    } 

    return [newImage autorelease]; 
} 

@end

调整大小NSImage中定制NSTextFieldCell

相关推荐