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Bug 145350 Implement handling of canDrop and onDragEnter methods in drag and drop observers

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patch=pierrechanial@netscape.net, r=timeless, sr=ben
This commit is contained in:
timeless%mac.com 2002-05-30 22:04:25 +00:00
parent e99a698488
commit 96b34b2c99
1 changed files with 80 additions and 30 deletions
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110
xpfe/global/resources/content/nsDragAndDrop.js
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@ -21,6 +21,7 @@
*
* Contributor(s):
* Ben Goodger <ben@netscape.com> (Original Author)
* Pierre Chanial <pierrechanial@netscape.net>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
@ -167,7 +168,7 @@ var nsDragAndDrop = {
* called when a drag passes over this element
*
* @param DOMEvent aEvent
* the DOM event fired by the drag init
* the DOM event fired by passing over the element
* @param Object aDragDropObserver
* javascript object of format described above that specifies
* the way in which the element responds to drag events.
@ -176,22 +177,18 @@ var nsDragAndDrop = {
{
if (!("onDragOver" in aDragDropObserver))
return;
if (!this.mDragSession)
this.mDragSession = this.mDragService.getCurrentSession();
if (this.mDragSession)
if (!this.checkCanDrop(aEvent, aDragDropObserver))
return;
var flavourSet = aDragDropObserver.getSupportedFlavours();
for (var flavour in flavourSet.flavourTable)
{
var flavourSet = aDragDropObserver.getSupportedFlavours();
for (var flavour in flavourSet.flavourTable)
if (this.mDragSession.isDataFlavorSupported(flavour))
{
if (this.mDragSession.isDataFlavorSupported(flavour))
{
this.mDragSession.canDrop = (this.mDragSession.sourceNode != aEvent.target);
aDragDropObserver.onDragOver(aEvent,
flavourSet.flavourTable[flavour],
this.mDragSession);
aEvent.preventBubble();
break;
}
aDragDropObserver.onDragOver(aEvent,
flavourSet.flavourTable[flavour],
this.mDragSession);
aEvent.preventBubble();
break;
}
}
},
@ -204,7 +201,7 @@ var nsDragAndDrop = {
* called when the user drops on the element
*
* @param DOMEvent aEvent
* the DOM event fired by the drag init
* the DOM event fired by the drop
* @param Object aDragDropObserver
* javascript object of format described above that specifies
* the way in which the element responds to drag events.
@ -213,27 +210,57 @@ var nsDragAndDrop = {
{
if (!("onDrop" in aDragDropObserver))
return;
if (!this.mDragSession)
this.mDragSession = this.mDragService.getCurrentSession();
if (this.mDragSession)
{
var flavourSet = aDragDropObserver.getSupportedFlavours();
var transferData = nsTransferable.get(flavourSet, this.getDragData, true);
aEvent.preventBubble();
// hand over to the client to respond to dropped data
var multiple = "canHandleMultipleItems" in aDragDropObserver && aDragDropObserver.canHandleMultipleItems;
var dropData = multiple ? transferData : transferData.first.first;
aDragDropObserver.onDrop(aEvent, dropData, this.mDragSession);
}
if (!this.checkCanDrop(aEvent, aDragDropObserver))
return;
if (this.mDragSession.canDrop) {
var flavourSet = aDragDropObserver.getSupportedFlavours();
var transferData = nsTransferable.get(flavourSet, this.getDragData, true);
// hand over to the client to respond to dropped data
var multiple = "canHandleMultipleItems" in aDragDropObserver && aDragDropObserver.canHandleMultipleItems;
var dropData = multiple ? transferData : transferData.first.first;
aDragDropObserver.onDrop(aEvent, dropData, this.mDragSession);
}
aEvent.preventBubble();
},
/**
* void dragExit (DOMEvent aEvent, Object aDragDropObserver) ;
*
* called when a drag leaves this element
*
* @param DOMEvent aEvent
* the DOM event fired by leaving the element
* @param Object aDragDropObserver
* javascript object of format described above that specifies
* the way in which the element responds to drag events.
**/
dragExit: function (aEvent, aDragDropObserver)
{
if (!this.checkCanDrop(aEvent, aDragDropObserver))
return;
if ("onDragExit" in aDragDropObserver)
aDragDropObserver.onDragExit(aEvent, this.mDragSession);
},
/**
* void dragEnter (DOMEvent aEvent, Object aDragDropObserver) ;
*
* called when a drag enters in this element
*
* @param DOMEvent aEvent
* the DOM event fired by entering in the element
* @param Object aDragDropObserver
* javascript object of format described above that specifies
* the way in which the element responds to drag events.
**/
dragEnter: function (aEvent, aDragDropObserver)
{
if (!this.checkCanDrop(aEvent, aDragDropObserver))
return;
if ("onDragEnter" in aDragDropObserver)
aDragDropObserver.onDragEnter(aEvent, this.mDragSession);
},
/**
* nsISupportsArray getDragData (Object aFlavourList)
*
@ -257,7 +284,30 @@ var nsDragAndDrop = {
supportsArray.AppendElement(trans);
}
return supportsArray;
}
},
/**
* Boolean checkCanDrop (DOMEvent aEvent, Object aDragDropObserver) ;
*
* Sets the canDrop attribute for the drag session.
* returns false if there is no current drag session.
*
* @param DOMEvent aEvent
* the DOM event fired by the drop
* @param Object aDragDropObserver
* javascript object of format described above that specifies
* the way in which the element responds to drag events.
**/
checkCanDrop: function (aEvent, aDragDropObserver)
{
if (!this.mDragSession)
this.mDragSession = this.mDragService.getCurrentSession();
if (!this.mDragSession)
return false;
this.mDragSession.canDrop = this.mDragSession.sourceNode != aEvent.target;
if ("canDrop" in aDragDropObserver)
this.mDragSession.canDrop &= aDragDropObserver.canDrop(aEvent, this.mDragSession);
return true;
}
};