I do not know if this is what you want to accomplish, but in order to
be aware of a DnD (Drag and Drop) situation, as you are explaining in
your example, both the initial and receiving components need to be able
to communicate with each other. In Java the DnD is accomplished by
enabling a DragListener in the initial component and a DropTarget in
the receiver. Since JSVGCanvas extends JComponent, you can set it up as
a DropTargetListener.
You may see java.awt.dnd.* and java.awt.datatransfer.* packages.
The way i have it is in a JTree that i have enabled as Dragable, when
it detects a drag operation, i create a StringTransferable (since SVG
is XML, and thus Text) with the SVG i want to drop in my canvas. The
JSVGCanvas implements DropTargetListener, and upon succesful drop (i.e.
the DataFlavor is accepted), I then get the drop location by converting
the Event.getLocation() coordinates to SVG coordinate namespace. And
then in the UpdateManager thread i add the SVG element to my DOM.
Andres.
references, in no specific order:
http://javaalmanac.com/egs/java.awt.dnd/pkg.html
http://www.rockhoppertech.com/java-drag-and-drop-faq.html
http://www.javaworld.com/javaworld/jw-03-1999/jw-03-dragndrop.html
http://java.sun.com/docs/books/tutorial/dnd/
On May 23, 2005, at 1:52 PM, [EMAIL PROTECTED] wrote:
Hello,
I noticed that when a mousedown event occurs "outside" the JSVGCanvas,
and the cursor is dragged "into" the canvas, that the mouseup event is
not
detected by any of its event listeners. (Also mouseReleased() is not
called.)
To work around this, I tried to check if a mouse button was in a "down"
state when
it enters the canvas:
public void mouseEntered(MouseEvent e) {
int button = e.getButton();
int modifier = e.getModifiers();
int id = e.getID();
System.out.println("Mouse entered: button=" +
button + " modifier" + modifier + " id=" +id);
}
But the values are always the same whether the mouse button is down or
up.
Is there another way to detect that the user is dragging some new item
onto
the canvas?
Is there another way to query the state of the mouse button at this
time?
Is there a "best practice" pattern for doing this?
Thanks in advance!
Ted
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