要处理 Drag-n-Drop,请执行以下操作,
-(void)InitMyOutlineView{
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[pMyOutlineView registerForDraggedTypes:
[NSArray arrayWithObject:NSStringPboardType]];
/* I tried both Yes and No */
[pMyOutlineView setDraggingSourceOperationMask:NSDragOperationEvery forLocal:NO];
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}
WriteItem 方法如下,
- (BOOL)outlineView:(NSOutlineView *)outlineView writeItems:(NSArray *)items toPasteboard:(NSPasteboard *)pboard{
[self log:@"write Items"];
NSString *pStr = [NSString stringWithFormat:@"this is the temp string "];
[pboard declareTypes:[NSArray arrayWithObject:NSStringPboardType] owner:self];
[pboard setString:pStr forType:NSStringPboardType];
[self log:@"returning YES"];
return YES;
}
现在我期待控制将来到 AcceptDrop 方法,但断点没有打到那里,并且在 Log/gdb 中得到以下日志
2011-02-04 16:21:25.435 MyApp[2006:a0f] write Items
2011-02-04 16:21:25.437 MyApp[2006:a0f] returning YES
2011-02-04 16:21:25.439 MyApp[2006:a0f] *** -[NSCFArray initWithObjects:count:]: attempt to insert nil object at objects[0]
并且控制没有来acceptDrop方法,
当我启用“异常停止”时,以下是它停止时的调用堆栈,
#0 0x981b94e6 in objc_exception_throw
#1 0x96ed34cf in -[__NSPlaceholderArray initWithObjects:count:]
#2 0x96efaaa3 in +[NSArray arrayWithObject:]
#3 0x92316dfd in -[NSOutlineView _columnsForDragImage]
#4 0x923f1e32 in -[NSTableView _doImageDragUsingRowsWithIndexes:event:pasteboard:source:slideBack:startRow:]
#5 0x91fea16a in -[NSTableView _performDragFromMouseDown:]
#6 0x91fe89b9 in -[NSTableView mouseDown:]
#7 0x91fe864e in -[NSOutlineView mouseDown:]
#8 0x91f86c68 in -[NSWindow sendEvent:]
#9 0x91e9f817 in -[NSApplication sendEvent:]
#10 0x91e332a7 in -[NSApplication run]
#11 0x91e2b2d9 in NSApplicationMain
让我再更新一件事,在我的大纲视图中,我有自定义单元格,它只是我正在使用的 Mac ImageTextCell 接口文件。
谁能指导我,我做错了什么
亲切的问候罗汉