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The default behavior
allows most content in an HTML page to be copied by dragging. You
can control the content allowed to be dragged using CSS properties
-webkit-user-select
and
-webkit-user-drag
.
Override the default drag-out behavior in the handler for the
dragstart
event. Call
the
setData()
method of the
dataTransfer
property
of the event object to put your own data into the drag gesture.
To indicate which drag effects a source object supports when
you are not relying on the default behavior, set the
dataTransfer.effectAllowed
property of
the event object dispatched for the
dragstart
event.
You can choose any combination of effects. For example, if a source
element supports both
copy
and
link
effects, set the
property to
"copyLink"
.
Setting the dragged data
Add
the data for the drag gesture in the handler for the
dragstart
event
with the
dataTransfer
property. Use the
dataTransfer.setData()
method to
put data onto the clipboard, passing in the MIME type and the data
to transfer.
For example, if you had an image element in your application,
with the id
imageOfGeorge
, you could use the following dragstart
event handler. This example adds representations of a picture of
George in several data formats, which increases the likelihood that
other applications can use the dragged data.
function dragStartHandler(event){
event.dataTransfer.effectAllowed = "copy";
var dragImage = document.getElementById("imageOfGeorge");
var dragFile = new air.File(dragImage.src);
event.dataTransfer.setData("text/plain","A picture of George");
event.dataTransfer.setData("image/x-vnd.adobe.air.bitmap", dragImage);
event.dataTransfer.setData("application/x-vnd.adobe.air.file-list",
new Array(dragFile));
}
Note:
When you call the
setData()
method
of
dataTransfer
object, no data is added by the
default drag-and-drop behavior.
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