使用NSStatusItem拖放

问题描述

我试图写一个应用程序，允许用户从Finder中拖动文件，并将它们放置到 NSStatusItem 。到目前为止，我创建了一个实现拖放界面的自定义视图。当我将这个视图添加为 NSWindow 的子视图时，所有这些都正常工作 - 鼠标光标提供适当的反馈，当我删除时，我的代码被执行。

I'm trying to write an application that allows the user to drag files from the Finder and drop them onto an NSStatusItem. So far, I've created a custom view that implements the drag and drop interface. When I add this view as a subview of an NSWindow it all works correctly -- the mouse cursor gives appropriate feedback, and when dropped my code gets executed.

然而，当我使用与 NSStatusItem的视图相同的视图时，它的行为不正确。鼠标光标给出了适当的反馈，指示文件可以被删除，但是当我删除文件时，我的下拉代码永远不会被执行。

However, when I use the same view as an NSStatusItem's view it doesn't behave correctly. The mouse cursor gives appropriate feedback indicating that the file can be dropped, but when I drop the file my drop code never gets executed.

有什么特别的，我需要做可以使用 NSStatusItem ？

Is there something special I need to do to enable drag and drop with an NSStatusItem?

推荐答案

这是一个允许拖动的自定义视图：

Here's a custom view that allows dragging:

@implementation DragStatusView

- (id)initWithFrame:(NSRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        //register for drags
        [self registerForDraggedTypes:[NSArray arrayWithObjects: NSFilenamesPboardType, nil]];
    }

    return self;
}

- (void)drawRect:(NSRect)dirtyRect
{
    //the status item will just be a yellow rectangle
    [[NSColor yellowColor] set];
    NSRectFill([self bounds]);
}

//we want to copy the files
- (NSDragOperation)draggingEntered:(id<NSDraggingInfo>)sender
{
    return NSDragOperationCopy;
}

//perform the drag and log the files that are dropped
- (BOOL)performDragOperation:(id <NSDraggingInfo>)sender
{
    NSPasteboard *pboard;
    NSDragOperation sourceDragMask;

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

    if ( [[pboard types] containsObject:NSFilenamesPboardType] ) {
        NSArray *files = [pboard propertyListForType:NSFilenamesPboardType];

        NSLog(@"Files: %@",files);
    }
    return YES;
}


@end

您将创建状态项：

NSStatusItem* item = [[[NSStatusBar systemStatusBar] statusItemWithLength:NSSquareStatusItemLength] retain];

DragStatusView* dragView = [[DragStatusView alloc] initWithFrame:NSMakeRect(0, 0, 24, 24)];
[item setView:dragView];
[dragView release];

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