我有一個NSImageView，佔用了一個窗口的全部範圍。圖像視圖沒有邊框，其設置顯示在左下角。所以這意味着無論窗口如何調整大小，視圖的來源都與實際圖像的原點相匹配。在NSImageView中獲取NSImage的界限
此外，圖像比我可以合理地適合在屏幕上的全尺寸大得多。所以我也有圖像視圖按比例縮小圖像的大小。但是，我似乎無法在任何地方找到這個比例因子。
我的最終目標是將鼠標向下的事件映射到實際的圖像座標。要做到這一點，我想我需要更多的信息......顯示的NSImage實際上有多大。
如果我看一下[imageView bounds]，我會得到圖像視圖的邊界矩形，該矩形一般會比圖像大。
我認爲這給了你所需要的：
NSRect imageRect = [imageView.cell drawingRectForBounds: imageView.bounds];
它返回視圖中的圖像的原點的偏移量，它的大小。
而對於你最終重新映射鼠標座標，這樣的事情在您的自定義視圖類應該努力的目標......
- (void)mouseUp:(NSEvent *)event
{
NSPoint eventLocation = [event locationInWindow];
NSPoint location = [self convertPoint: eventLocation fromView: nil];
NSRect drawingRect = [self.cell drawingRectForBounds:self.bounds];
location.x -= drawingRect.origin.x;
location.y -= drawingRect.origin.y;
NSSize frameSize = drawingRect.size;
float frameAspect = frameSize.width/frameSize.height;
NSSize imageSize = self.image.size;
float imageAspect = imageSize.width/imageSize.height;
float scaleFactor = 1.0f;
if(imageAspect > frameAspect) {
///in this case image.width == frame.width
scaleFactor = imageSize.width/frameSize.width;
float imageHeightinFrame = imageSize.height/scaleFactor;
float imageOffsetInFrame = (frameSize.height - imageHeightinFrame)/2;
location.y -= imageOffsetInFrame;
} else {
///in this case image.height == frame.height
scaleFactor = imageSize.height/frameSize.height;
float imageWidthinFrame = imageSize.width/scaleFactor;
float imageOffsetInFrame = (frameSize.width - imageWidthinFrame)/2;
location.x -= imageOffsetInFrame;
}
location.x *= scaleFactor;
location.y *= scaleFactor;
//do something with you newly calculated mouse location
}
對不起...第一行結束了不起作用。我NSLog'ed計算矩形，並調整窗口的大小，使縱橫比發生變化（但圖像單元設置爲按比例繪製），圖像單元的邊界匹配窗口的邊界，而不是顯示的圖像。我開始認爲沒有API調用。我能做的是計算原始非縮放圖像的縱橫比...並用它來計算調整大小的窗口中的圖像範圍 – wrjohns 2012-08-06 23:10:37
鑑於描述瞭如何設置可能正確的事情。上面的代碼的其餘部分然後計算圖像本身的偏移量。你試過了其餘的代碼嗎？除了我的視圖和窗口邊界不匹配，因爲我有一個邊界，我正在做一個非常類似的事情。您可能不需要最終的* = scaleFactor，因爲我需要圖像空間中的座標（即......相對於圖像的實際大小）。 – combinatorial 2012-08-07 02:30:48
我確實嘗試了其餘的代碼。但隨着drawingRect被關閉，最終的計算座標也被關閉。我決定採用兩種方法來實現我想要的功能：從NSWindowDelegate實現一些方法，並強制任何手動調整大小以保留寬高比，然後在我的mouseUp：方法中，我可以假設圖像大小=窗口大小 – wrjohns 2012-08-07 03:14:40
正如我在上述結構評論所指出的，這裏是我採取的方法：
// the view that mouseUp: is part of doesnt draw anything. I'm layering it
// in the window hierarchy to intercept mouse events. I suppose I could have
// subclassed NSImageView instead, but I went this route. isDragging is
// an ivar...its cleared in mouseDown: and set in mouseDragged:
// this view has no idea what the original unscaled image size is, so
// rescaling is done by caller
- (void)mouseUp:(NSEvent *)theEvent
{
if (!isDragging)
{
NSPoint rawPoint = [theEvent locationInWindow];
NSImageView *view = self.subviews.lastObject;
point = [self convertPoint:rawPoint fromView:view];
point.x /= view.bounds.size.width;
point.y /= view.bounds.size.height;
[owner mouseClick:point];
}
}
而且在我NSWindowController，這是我的鼠標視圖窗口委託，我有：
static int resizeMode=-1;
- (void)windowDidEndLiveResize:(NSNotification *)notification
{
if ([notification object]==frameWindow)
self.resizeFrameSelection=0;
resizeMode = -1;
}
- (NSSize)windowWillResize:(NSWindow *)sender toSize:(NSSize)frameSize
{
if (sender==frameWindow)
{
float imageAspectRatio = (float)movie.movieSize.width/(float)movie.movieSize.height;
float newH = frameSize.height;
float newW = frameSize.width;
float currH = sender.frame.size.height;
float currW = sender.frame.size.width;
float deltaH = abs(newH-currH);
float deltaW = abs(newW-currW);
// lock onto one dimension to key off of, per drag.
if (resizeMode==1 || (resizeMode==-1 && deltaW<deltaH))
{
// adjust width to match aspect ratio
frameSize.width = frameSize.height * imageAspectRatio;
resizeMode=1;
}
else
{
// adjust height to match aspect ratio
frameSize.height = frameSize.width/imageAspectRatio;
resizeMode=2;
}
}
return frameSize;
}
因爲我還沒有找到任何解決方案來獲取NSImageView中的真實圖像幀，所以我手動進行了圖像計算，考慮了它的所有屬性（縮放，對齊和邊框）。這可能不是最有效的代碼，可能會有0.5-1像素與真實圖像有微小的偏差，但它接近原始圖像（我知道這個問題很老，但解決方案可能會幫助其他人）：
@implementation NSImageView (ImageFrame)
// -------------------------------------------------------------------------
// -imageFrame
// -------------------------------------------------------------------------
- (NSRect)imageFrame
{
// Find the content frame of the image without any borders first
NSRect contentFrame = self.bounds;
NSSize imageSize = self.image.size;
NSImageFrameStyle imageFrameStyle = self.imageFrameStyle;
if (imageFrameStyle == NSImageFrameButton ||
imageFrameStyle == NSImageFrameGroove)
{
contentFrame = NSInsetRect(self.bounds, 2, 2);
}
else if (imageFrameStyle == NSImageFramePhoto)
{
contentFrame = NSMakeRect(contentFrame.origin.x + 1,
contentFrame.origin.y + 2,
contentFrame.size.width - 3,
contentFrame.size.height - 3);
}
else if (imageFrameStyle == NSImageFrameGrayBezel)
{
contentFrame = NSInsetRect(self.bounds, 8, 8);
}
// Now find the right image size for the current imageScaling
NSImageScaling imageScaling = self.imageScaling;
NSSize drawingSize = imageSize;
// Proportionally scaling
if (imageScaling == NSImageScaleProportionallyDown ||
imageScaling == NSImageScaleProportionallyUpOrDown)
{
NSSize targetScaleSize = contentFrame.size;
if (imageScaling == NSImageScaleProportionallyDown)
{
if (targetScaleSize.width > imageSize.width) targetScaleSize.width = imageSize.width;
if (targetScaleSize.height > imageSize.height) targetScaleSize.height = imageSize.height;
}
NSSize scaledSize = [self sizeByScalingProportionallyToSize:targetScaleSize fromSize:imageSize];
drawingSize = NSMakeSize(scaledSize.width, scaledSize.height);
}
// Axes independent scaling
else if (imageScaling == NSImageScaleAxesIndependently)
drawingSize = contentFrame.size;
// Now get the image position inside the content frame (center is default) from the current imageAlignment
NSImageAlignment imageAlignment = self.imageAlignment;
NSPoint drawingPosition = NSMakePoint(contentFrame.origin.x + contentFrame.size.width/2.0 - drawingSize.width/2.0,
contentFrame.origin.y + contentFrame.size.height/2.0 - drawingSize.height/2.0);
// NSImageAlignTop/NSImageAlignTopLeft/NSImageAlignTopRight
if (imageAlignment == NSImageAlignTop ||
imageAlignment == NSImageAlignTopLeft ||
imageAlignment == NSImageAlignTopRight)
{
drawingPosition.y = contentFrame.origin.y+contentFrame.size.height - drawingSize.height;
if (imageAlignment == NSImageAlignTopLeft)
drawingPosition.x = contentFrame.origin.x;
else if (imageAlignment == NSImageAlignTopRight)
drawingPosition.x = contentFrame.origin.x + contentFrame.size.width - drawingSize.width;
}
// NSImageAlignBottom/NSImageAlignBottomLeft/NSImageAlignBottomRight
else if (imageAlignment == NSImageAlignBottom ||
imageAlignment == NSImageAlignBottomLeft ||
imageAlignment == NSImageAlignBottomRight)
{
drawingPosition.y = contentFrame.origin.y;
if (imageAlignment == NSImageAlignBottomLeft)
drawingPosition.x = contentFrame.origin.x;
else if (imageAlignment == NSImageAlignBottomRight)
drawingPosition.x = contentFrame.origin.x + contentFrame.size.width - drawingSize.width;
}
// NSImageAlignLeft/NSImageAlignRight
else if (imageAlignment == NSImageAlignLeft)
drawingPosition.x = contentFrame.origin.x;
// NSImageAlignRight
else if (imageAlignment == NSImageAlignRight)
drawingPosition.x = contentFrame.origin.x + contentFrame.size.width - drawingSize.width;
return NSMakeRect(round(drawingPosition.x),
round(drawingPosition.y),
ceil(drawingSize.width),
ceil(drawingSize.height));
}
// -------------------------------------------------------------------------
// -sizeByScalingProportionallyToSize:fromSize:
// -------------------------------------------------------------------------
- (NSSize)sizeByScalingProportionallyToSize:(NSSize)newSize fromSize:(NSSize)oldSize
{
CGFloat widthHeightDivision = oldSize.width/oldSize.height;
CGFloat heightWidthDivision = oldSize.height/oldSize.width;
NSSize scaledSize = NSZeroSize;
if (oldSize.width > oldSize.height)
{
if ((widthHeightDivision * newSize.height) >= newSize.width)
{
scaledSize = NSMakeSize(newSize.width, heightWidthDivision * newSize.width);
} else {
scaledSize = NSMakeSize(widthHeightDivision * newSize.height, newSize.height);
}
} else {
if ((heightWidthDivision * newSize.width) >= newSize.height)
{
scaledSize = NSMakeSize(widthHeightDivision * newSize.height, newSize.height);
} else {
scaledSize = NSMakeSize(newSize.width, heightWidthDivision * newSize.width);
}
}
return scaledSize;
}
@end
我試過了。框架和邊界等都是相對於NSView/NSWindow類型的對象。所以我可以得到視圖或窗口本身的邊界框架......問題是NSImageView並沒有繪製它的所有邊界。部分視圖是空白的。我需要的是NSImageView縮小其圖像的量，或者ImageView實際繪製的邊界矩形（與其擁有的相反） – wrjohns 2012-07-29 19:42:19
現在，我將採用一種解決方法，其中我不允許窗口被調整大小，並從窗口中刪除所有其他UI元素（如標題欄），以便我知道超級視圖邊界= NSImageView邊界=實際圖像的大小。 – wrjohns 2012-07-29 19:44:09
NSImages沒有框架。他們**有**尺寸，但尺寸是全尺寸圖像，而不是實際尺寸。 – wrjohns 2012-07-29 23:09:05