怪异的行为：从堆栈拖动到状态项不工作 [英] Weird behavior: dragging from Stacks to status item doesn't work

问题描述

我的应用程序允许拖动到主窗口和状态项。

• 如果我将文件从堆栈拖动到我的窗口


• 如果我将一个文件从Finder拖动到我的窗口，它可以完美地工作。


• 如果我将一个文件从Finder拖动到我的状态项，它会正常工作。


• 如果我将文件从Stack拖动到my
  

窗口和状态项使用完全相同的拖放处理代码。

有趣的是，当一个文件从Stacks拖到状态项时，游标会按预期变化，因为 - （NSDragOperation）draggingEntered： ）sender {
NSPasteboard * pboard;
NSDragOperation sourceDragMask; 方法按预期调用。

当文件被删除时， - （BOOL）performDragOperation：（id）sender {
NSPasteboard * pboard;
NSDragOperation sourceDragMask; 方法未被调用。

这是第一个方法的实现：

   - （NSDragOperation）draggingEntered：（id< NSDraggingInfo>）sender {
 NSPasteboard * pboard; 
 NSDragOperation sourceDragMask; 
 
 sourceDragMask = [sender draggingSourceOperationMask]; 
 pboard = [sender draggingPasteboard]; 
 
 if（[[pboard types] containsObject：NSColorPboardType]）{
 if（sourceDragMask& NSDragOperationGeneric）{
 return NSDragOperationGeneric; 
} 
} 
 if（[[pboard types] containsObject：NSFilenamesPboardType]）{
 if（sourceDragMask& NSDragOperationLink）{
 return NSDragOperationLink; 
} else if（sourceDragMask& NSDragOperationCopy）{
 return NSDragOperationCopy; 
} 
} 
 
 return NSDragOperationNone; 
} 
  

谢谢！

解决方案

这是一个合法的问题。我已经向苹果提交了一个bug报告。 http://openradar.appspot.com/radar?id=1745403

在此期间，我想出了一个解决方法。即使 performDragOperation：从未被调用， draggingEnded：仍然是。你仍然可以通过检查draggingLocation点是否在NSView的rect内部来判断文件是否被放在NSStatusItem上。这里有一个例子：

   - （void）draggingEnded：（id< NSDraggingInfo>）sender 
 {
 if（NSPointInRect（[sender draggingLocation]，self.frame））{
 //文件实际上被放在视图上，所以手动调用performDrag 
 [self performDragOperation：sender]; 
} 
} 
  

希望这有助于修复错误。 p>

My application allows dragging to both the main window and to a Status item.

• If I drag a file from Stacks to my window, it works perfectly.
• If I drag a file from Finder to my window, it works perfectly.
• If I drag a file from Finder to my status item, it works perfectly.
• If I drag a file from Stack to my status item, it doesn't work.

Both window and status item use the exact same drag and drop handling code.

The funny thing is that when a file is dragged from Stacks onto the status item, the cursor changes as expected because the - (NSDragOperation)draggingEntered:(id )sender { NSPasteboard *pboard; NSDragOperation sourceDragMask; method is called as expected.

When the file is dropped, however, the - (BOOL)performDragOperation:(id )sender { NSPasteboard *pboard; NSDragOperation sourceDragMask; method is NOT called.

Here is the implementation of the first method:

- (NSDragOperation)draggingEntered:(id <NSDraggingInfo>)sender {
    NSPasteboard *pboard;
    NSDragOperation sourceDragMask;

    sourceDragMask = [sender draggingSourceOperationMask];
    pboard = [sender draggingPasteboard];

    if ( [[pboard types] containsObject:NSColorPboardType] ) {
        if (sourceDragMask & NSDragOperationGeneric) {
            return NSDragOperationGeneric;
        }
    }
    if ( [[pboard types] containsObject:NSFilenamesPboardType] ) {
        if (sourceDragMask & NSDragOperationLink) {
            return NSDragOperationLink;
        } else if (sourceDragMask & NSDragOperationCopy) {
            return NSDragOperationCopy;
        }
    }

    return NSDragOperationNone;
}

Thanks!

解决方案

This is a legitimate issue. I've submitted a bug report for this to Apple. http://openradar.appspot.com/radar?id=1745403

In the meantime, I've figured out a workaround. Even though performDragOperation: is never called, draggingEnded: still is. You can still tell if the file was dropped on the NSStatusItem by checking if the "draggingLocation" point was inside NSView's rect. Here's an example:

- (void)draggingEnded:(id<NSDraggingInfo>)sender
{
    if(NSPointInRect([sender draggingLocation],self.frame)){
        //The file was actually dropped on the view so call the performDrag manually
        [self performDragOperation:sender];
    }
}

Hope this helps until the bug gets fixed.

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