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在我的应用我有somefiles之一NSOutlineView有列表和一个WebView中,
用户可以从大纲视图的WebView拖动任何项目,对,我想处理数据库事务,可可的WebView拖放
在大纲视图,我已经实现下面的方法,
- (BOOL)outlineView:(NSOutlineView *)outlineView writeItems:(NSArray *)items toPasteboard:(NSPasteboard *)pboard{
[self log:@"write Items”];
// Some other code to prepare the Write Item,
}
- (NSDragOperation)outlineView:(NSOutlineView *)outlineView validateDrop:(id <NSDraggingInfo>)info proposedItem:(id)item proposedChildIndex:(NSInteger)index{
}
- (BOOL)outlineView:(NSOutlineView *)outlineView acceptDrop:(id <NSDraggingInfo>)info item:(id)item childIndex:(NSInteger)index{
}
在web视图侧,我已经实现以下,方法,
- (NSDragOperation)draggingEntered:(id <NSDraggingInfo>)sender {
NSPasteboard *pboard;
NSDragOperation sourceDragMask;
[self log:@"Inside draggingEntered”];
return NSDragOperationEvery;
}
- (BOOL)prepareForDragOperation:(id <NSDraggingInfo>)sender{
}
- (BOOL)performDragOperation:(id <NSDraggingInfo>)sender{
}
现在,当我从大纲视图中拖动的元素的WebView,我可以看到,大纲视图的writeItem获取调用,
并在网页视图,dragEnter事件正从我是在哪里,没有返回拖动操作称为无,但返回NSDragoperationEvery,
的问题是,我没有得到方法,prepareForDragOperation和PerformDragOperation,
谁能帮我请,
亲切的问候
罗汉