Handling drag/drop in treeview

abu · 2nd July 2007, 20:31

I add a new treeview item and several subitems to the ML treeview with ML_IPC_TREEITEM_ADD. Later, I'd like to rearrange the subitems with drag/drop, but I don't know how to do that.
Dragging works fine, and Winamp displays the horizontal "insertion bar" in the TV. But when I drop, I only get a ML_MSG_TREE_ONDROPTARGET. This contains the param of the dragged item, and a POINT. How can I get the target position from that (the tree item after which it was dropped)?

Benski · 2nd July 2007, 22:52

When you get called with ML_MSG_TREE_ONDROP, param3 will be the destination tree ID.

abu · 3rd July 2007, 08:38

Oh, cool.
That information is missing in the header:

code:
  #define ML_MSG_TREE_ONDROP 0x104 // param1 = param of tree item, param2 = POINT * to the mouse position

                                  // if you support dropping, send the appropriate ML_IPC_HANDLEDROP using SendMessage() and return 1, otherwise return -1.

2nd July 2007, 20:31	#1
abu mlipod moderator (Senior Member) Join Date: Jun 2005 Location: Germany Posts: 3,457	Handling drag/drop in treeview I add a new treeview item and several subitems to the ML treeview with ML_IPC_TREEITEM_ADD. Later, I'd like to rearrange the subitems with drag/drop, but I don't know how to do that. Dragging works fine, and Winamp displays the horizontal "insertion bar" in the TV. But when I drop, I only get a ML_MSG_TREE_ONDROPTARGET. This contains the param of the dragged item, and a POINT. How can I get the target position from that (the tree item after which it was dropped)? WinAmp Pro 5.5 with ml_iPod 3.10 + dev.patches (download it) ml_iPod documentation Wiki - ml_iPod FAQ - search ml_iPod forum - iPhone/iTouch - Found a bug? Donations to support the ml_iPod project can be done HERE

3rd July 2007, 08:38	#3
abu mlipod moderator (Senior Member) Join Date: Jun 2005 Location: Germany Posts: 3,457	Oh, cool. That information is missing in the header: code: #define ML_MSG_TREE_ONDROP 0x104 // param1 = param of tree item, param2 = POINT * to the mouse position // if you support dropping, send the appropriate ML_IPC_HANDLEDROP using SendMessage() and return 1, otherwise return -1. WinAmp Pro 5.5 with ml_iPod 3.10 + dev.patches (download it) ml_iPod documentation Wiki - ml_iPod FAQ - search ml_iPod forum - iPhone/iTouch - Found a bug? Donations to support the ml_iPod project can be done HERE

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2nd July 2007, 22:52	#2
Benski Ben Allison Former Winamp Developer Join Date: Jan 2005 Location: Brooklyn, NY Posts: 1,057	When you get called with ML_MSG_TREE_ONDROP, param3 will be the destination tree ID.