继续跟踪鼠标拖动事件，即使光标移出电影之后 [英] continue tracking mouse-drag event even after cursor moves out of the movie

问题描述

我有很少的视图在父视图中的网格中对齐（所有都是NSView的）

我覆盖
- （void）mouseDown：（NSEvent *）事件
- （void）mouseDragged：（NSEvent *）子视图子类中某些自定义绘图的事件

具体来说，

问题：当光标移出子视图时（在鼠标拖动期间），显然我不能跟踪事件，因此我不能调整矩形的大小。
我想跟踪鼠标移动甚至在应用程序窗口外...（现在只是拖动事件）

有没有明显或复杂的方法实现此.....

感谢提前

Rajesh

< （NSEvent *）theEvent
{
NSPoint point;

while（1）{
theEvent = [[self window] nextEventMatchingMask：（NSLeftMouseDraggedMask | NSLeftMouseUpMask）];
point = [self convertPoint：[theEvent locationInWindow] fromView：nil];

//执行点

if（[TheEvent type] == NSLeftMouseUp）
break;
}
}

I have few views aligned in grids in parent view (All being NSView's )

I am overriding -(void)mouseDown:(NSEvent *)event - (void)mouseDragged:(NSEvent *)theEvent for some custom drawing in child view subclass

To be specific, I draw some rectangle boxes during mouse drag in child view's.

Problem: when cursor moves out of the child view( during mouse drag ) , obviously, I am not able to track the event and hence I cannot resize the rectangle. I want to track the mouse movements even outside the application window... (for now just the drag event )

Is there any obvious or complex way to achieve this.....

Thanks in Advance

Rajesh

解决方案

- (void)mouseDown:(NSEvent *)theEvent
{
    NSPoint point;
    while (1) {
        theEvent = [[self window] nextEventMatchingMask: (NSLeftMouseDraggedMask | NSLeftMouseUpMask)];
        point = [self convertPoint: [theEvent locationInWindow] fromView: nil];

        // do something with point

        if ([theEvent type] == NSLeftMouseUp)
            break;
    }
}

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