| Issues with Tree.getItem(Point) and Table.getItem(Point) [message #460545] |
Wed, 31 August 2005 14:21  |
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Hi
I use tables and trees (multi column) and I have a mouse listener
attached to them. It is supposed to return the item on which the
user clicked (right click even in multiselect, so selection is not
helpful).
I use the following code to figure out the item (somewhat shortened):
// get the mouse position (absolute on the screen)
Point mousePosition = control.getDisplay().getCursorLocation();
// get the top left coordinate fo the table (absolute on the screen)
Point tablePosition = table.getParent().toDisplay(table.getLocation());
// relative position = absolute position - top left corner of table
Point relativePosition = new Point(
mousePosition.x - tablePosition.x,
mousePosition.y - tablePosition.y);
// now use the position relative in the table to fetch the item
TableItem item = table.getItem(relPos);
For tables this works perfectly. However, doing the same with a tree,
I always get the item below the one that I actually clicked on.
The "Offset" is exactly the height of one row.
Where does this offset come from? How can it be explained? Is it a bug?
BTW: For some other reasons I cannot use the mouse event providing the
mouse coordinates as the entire code above is located inside an Action
object (run() method).
Thanks
Michael Pellaton
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