在NSTableView中实现拖放

问题描述

任何人都可以帮助我实现拖放在NSTableView？我使用下面的代码，但是这些方法在执行过程中没有被调用。

   - （BOOL）tableView：（NSTableView * tv writeRowsWithIndexes：（NSIndexSet *）rowIndexes toPasteboard：（NSPasteboard *）pboard 
 {
 //将行号复制到粘贴板。 
 NSData * data = [NSKeyedArchiver archivedDataWithRootObject：rowIndexes]; 
 [pboard declareTypes：[NSArray arrayWithObject：@。gif] owner：self]; 
 [pboard setData：data forType：@。gif]; 
 return YES; 
} 
 
  - （NSDragOperation）tableView：（NSTableView *）tv validateDrop：（id< NSDraggingInfo>）info proposedRow：（NSInteger）row proposedDropOperation：（NSTableViewDropOperation）op 
 {
 //在此处添加代码以验证删除
 
 if（row> [m_imageArray count]）
 return NSDragOperationNone; 
 
 if（nil == [info draggingSource]）//从其他应用程序
 {
 return NSDragOperationNone; 
} 
 else if（self == [info draggingSource]）// From self 
 {
 return NSDragOperationNone; 
} 
 else //从其他文档
 {
 [tv setDropRow：row dropOperation：NSTableViewDropAbove]; 
 return NSDragOperationCopy; 
} 
 
 NSLog（@validate Drop）; 
 return NSDragOperationCopy; 
 
 
 
  - （BOOL）tableView：（NSTableView *）aTableView acceptDrop：（id< NSDraggingInfo>）info 
 row：（NSInteger）row dropOperation： （NSTableViewDropOperation）操作
 {
 NSPasteboard * pboard = [info draggingPasteboard]; 
 NSData * rowData = [pboard dataForType：@。gif]; 
 NSIndexSet * rowIndexes = [NSKeyedUnarchiver unarchiveObjectWithData：rowData]; 
 NSInteger dragRow = [rowIndexes firstIndex]; 
 
 //将指定的行移动到新位置... 
} 
  

registerForDraggedTypes：。否则，你已经注意到，这些方法都不会被调用。

Can anyone help me to implement drag and drop in an NSTableView? I used this code below, but these methods are not getting called during execution.

- (BOOL)tableView:(NSTableView *)tv writeRowsWithIndexes:(NSIndexSet *)rowIndexes toPasteboard:(NSPasteboard*)pboard
{
    // Copy the row numbers to the pasteboard.
    NSData *data = [NSKeyedArchiver archivedDataWithRootObject:rowIndexes];
    [pboard declareTypes:[NSArray arrayWithObject:@".gif"] owner:self];
    [pboard setData:data forType:@".gif"];
    return YES;
}

- (NSDragOperation)tableView:(NSTableView*)tv validateDrop:(id <NSDraggingInfo>)info proposedRow:(NSInteger)row proposedDropOperation:(NSTableViewDropOperation)op
{
    // Add code here to validate the drop

    if (row > [ m_imageArray count])
        return NSDragOperationNone;

    if (nil == [info draggingSource]) // From other application
    {
        return NSDragOperationNone;
    }
    else if (self == [info draggingSource]) // From self
    {
        return NSDragOperationNone;
    }
    else // From other documents
    {
        [tv setDropRow: row dropOperation: NSTableViewDropAbove];
        return NSDragOperationCopy;
    }

    NSLog(@"validate Drop");
    return NSDragOperationCopy;
}


- (BOOL)tableView:(NSTableView *)aTableView acceptDrop:(id <NSDraggingInfo>)info
              row:(NSInteger)row dropOperation:(NSTableViewDropOperation)operation
{
    NSPasteboard* pboard = [info draggingPasteboard];
    NSData* rowData = [pboard dataForType:@".gif"];
    NSIndexSet* rowIndexes = [NSKeyedUnarchiver unarchiveObjectWithData:rowData];
    NSInteger dragRow = [rowIndexes firstIndex];

    // Move the specified row to its new location...
}

解决方案

You need to declare a custom drag type for your table view and then call registerForDraggedTypes: with your custom type. Otherwise, as you have noticed, none of these methods will get called.

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