sorry I am creating monologic threads ... more like a blog ... my
problems seem to be quite esoteric.
Anyways, here is an update. I want to drag a tree node from one
treeVirtual to another. I am using this supportsDrop function to check
whether I can drop the node:
// function to check whether drop can be possible
var _this = timesTree;
_this.supportsDrop = function(dragCache) {
// hack: update cell focus indicator
_this._getPaneScrollerArr()[0]._focusCellAtPagePos(dragCache.pageX,
dragCache.pageY);
// drag target
var row = _this._getPaneScrollerArr()[0].getFocusedRow();
var rowData = _this.getDataModel().getRowData(row);
if ( ! rowData ) return;
var targetNode = rowData[0];
// programmatically select node to load children after a delay
if ( ! _this.__dragSelectionTimeStamp )
{
_this.__dragSelectionTimeStamp = (new Date).getTime();
}
else
{
if ( (new Date).getTime() - _this.__dragSelectionTimeStamp > 1000 )
{
if ( row != _this.__dragSelectionRow )
{
_this.getSelectionModel().addSelectionInterval(row, row);
}
_this.__dragSelectionTimeStamp = (new Date).getTime();
_this.__dragSelectionRow = row;
}
}
// this doesn't work:
// drag source node
var sourceNode =
qx.event.handler.DragAndDropHandler.getInstance().getData();
// source and destination node type
var sourceType = sourceNode.type;
var targetType = targetNode.type;
switch (sourceType)
{
case "staffschedule.types.Person":
if ( targetType == "staffschedule.types.Date" ) return false;
break;
default: return true;
}
return true;
}
What this does is
- to update the focus indicator in the target tree during the drag session
- to select the tree node after a delay of 1s, triggering a
selectionChange event. This loads the node children in my app, so I can
open the tree branches during the drag session
- finally, it should check whether the drop is allowed. In order to do
this, I need the drag source data as explained in my last post. It is
not contained in the dragCache object, but it also doesn't seem to be
contained in qx.event.handler.DragAndDropHandler.getInstance().getData()
(which has "no properties", thus, it is null).
What can I do?
Thanks,
Christian
bibliograph schrieb:
> Hello,
>
> there seems to be a problem (or at least I am having this problem) with
> drag & drop involving virtual widgets.
>
> The current architecture assumes that it is enough to store the
> sourceWidget and the destinationWidget during the drag session. However,
> with virtual widgets this is not enough - we need to store the internal
> information on what node/row/cell etc. has been dragged.
>
> Of course, we can send it with the drag event during dragStart:
>
> myVirtualTree.addEventHandler("dragStart",function(event){
> // get drag source
> node = this.getDataModel().getSelectedNodes()[0];
> if ( node && node.type =="staffschedule.types.Person" )
> {
> event.addData(node.type, node);
> event.addAction("move");
> event.startDrag();
> }
> }
>
> but if I use the "supportsDrop" method on the destination widget, I have
> no access to the event data, because the dragCache object that is sent
> to the supportsDrop function does not contain the drag data. So I am
> left to attaching the data to the source widget and retrieving it
> manually inside the supportsDrop function. Or is there a way to get the
> drag data through qx.event.handler.DragAndDropHandler ?
>
> Thanks,
>
> Christian
>
>
>
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