dhtmlxTree drag-n-drop or drag-n-copy

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#1

How would you recommend implementing providing a user with the choice of drag-n-drop or drag-n-copy?



Eg windows xp

Find the file or folder you want to move.

1 To move drag the file or folder to the destination.

2 To copy the item instead of moving it, press and hold down CTRL while dragging.

#2

The small code modification will required to achieve such effect.
In dhtmlxtree.js you can locate next line
if (!this.callEvent(“onBeforeDrag”,[obj.id])) return null;
and replace it with
if (!this.callEvent(“onBeforeDrag”,[obj.id,(e||event)])) return null;

Now during tree’s init , the next code can be used

tree.attachEvent(“onBeforeDrag”,function(id,ev){
this.enableMercyDrag(ev.ctrlKey)
return true;
})

as result - if drag operation was started with ctrl-key pressed, tree will work in drag-as-copy mode.