使 MAAttachedWindow 可调整大小而不反弹？

Question

为了使 MAAttachedWindow 可调整大小，我使用 此处的代码:

- (void)mouseDown:(NSEvent *)event {
NSPoint pointInView = [event locationInWindow];

BOOL resize = YES;
if (NSPointInRect(pointInView, [self resizeRect]))
{
    resize = YES;
}

NSWindow *window = self;
NSPoint originalMouseLocation = [window convertBaseToScreen:[event locationInWindow]];
NSRect originalFrame = [window frame];

while (YES)
{
    //
    // Lock focus and take all the dragged and mouse up events until we
    // receive a mouse up.
    //
    NSEvent *newEvent = [window
                         nextEventMatchingMask:(NSLeftMouseDraggedMask | NSLeftMouseUpMask)];

    if ([newEvent type] == NSLeftMouseUp)
    {
        break;
    }

    //
    // Work out how much the mouse has moved
    //
    NSPoint newMouseLocation = [window convertBaseToScreen:[newEvent locationInWindow]];
    NSPoint delta = NSMakePoint(
                                newMouseLocation.x - originalMouseLocation.x,
                                newMouseLocation.y - originalMouseLocation.y);

    NSRect newFrame = originalFrame;

    if (!resize)
    {
        //
        // Alter the frame for a drag
        //
        newFrame.origin.x += delta.x;
        newFrame.origin.y += delta.y;
    }
    else
    {
        //
        // Alter the frame for a resize
        //
        //          newFrame.size.width += delta.x;
        newFrame.size.width += delta.x*2; // customize
        newFrame.size.height -= delta.y;
        newFrame.origin.y += delta.y;

        //
        // Constrain to the window's min and max size
        //
        NSRect newContentRect = [window contentRectForFrameRect:newFrame];
        NSSize maxSize = [window maxSize];
        NSSize minSize = [window minSize];
        if (newContentRect.size.width > maxSize.width)
        {
            newFrame.size.width -= newContentRect.size.width - maxSize.width;
        }
        else if (newContentRect.size.width < minSize.width)
        {
            newFrame.size.width += minSize.width - newContentRect.size.width;
        }
        if (newContentRect.size.height > maxSize.height)
        {
            newFrame.size.height -= newContentRect.size.height - maxSize.height;
            newFrame.origin.y += newContentRect.size.height - maxSize.height;
        }
        else if (newContentRect.size.height < minSize.height)
        {
            newFrame.size.height += minSize.height - newContentRect.size.height;
            newFrame.origin.y -= minSize.height - newContentRect.size.height;
        }
    }




    [window setFrame:newFrame display:NO animate:NO];
    }

}

当我拖动窗口时，我可以调整它的大小。但时不时会有一点反弹。 您可以下载演示项目。 运行项目并单击状态菜单上的图标打开窗口。尝试前后伸展，这样你就可以轻松地重现它。 希望有人能帮我解决这个问题。

Answer 1

我检查了您的代码，似乎错误是有时 NSPoint newMouseLocation = [window ConvertBaseToScreen:[newEvent locationInWindow]]; 会返回原始鼠标位置而不是新位置。

我不确定为什么会失败，但无论如何这都不是最佳方法。您不应根据原始鼠标位置计算新帧，而应不断更新该位置并仅将窗口移动鼠标在当前跟踪迭代中移动的量

这是一个清理、缩短的版本这似乎消除了这个错误。

- (void) mouseDown:(NSEvent *)event
{
    NSWindow *window = self;
    NSPoint originalMouseLocation = [window convertBaseToScreen:[event locationInWindow]];


while (YES)
{

    NSEvent *newEvent = [window
                         nextEventMatchingMask:(NSLeftMouseDraggedMask | NSLeftMouseUpMask)];

    if ([newEvent type] == NSLeftMouseUp)
    {
        break;
    }

    NSPoint newMouseLocation = [window convertBaseToScreen:[newEvent locationInWindow]];

    NSPoint delta = NSMakePoint(
                                roundf(newMouseLocation.x - originalMouseLocation.x),
                                roundf(newMouseLocation.y - originalMouseLocation.y));

    NSRect newFrame = [window frame];
    newFrame.size.width += delta.x*2; // customize
    newFrame.size.height -= delta.y;
    newFrame.origin.y += delta.y;

    [window setFrame:newFrame display:YES animate:NO];
    originalMouseLocation = newMouseLocation; // <-- added this

}

}