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Multi-Row Drag and Drop strange behavior
Hi Guys,
I am experiencing some strange behaviour with a table drag and drop. I have it configured for the table to drop multi-rows onto other rows.
The issue is, if a row is selected and you drag on another row (that is not selected) a drag will begin with the unselected row. My understanding is that if the DragMode is set to MULTIROW I should not be able to start a drag by dragging unselected items.
Test Code to reproduce:
public class TableMultiSelectApplication extends Application {
@Override
public void init() {
Window mainWindow = new Window("Table Application");
Table t = new Table("Table");
t.addContainerProperty("Id", String.class, null);
t.addItem(new Object[]{"1"}, new Integer(1));
t.addItem(new Object[]{"2"}, new Integer(2));
t.addItem(new Object[]{"3"}, new Integer(3));
t.addItem(new Object[]{"4"}, new Integer(4));
t.addItem(new Object[]{"5"}, new Integer(5));
t.addItem(new Object[]{"6"}, new Integer(6));
t.setSizeFull();
t.setSelectable(true);
t.setMultiSelect(true);
t.setDragMode(TableDragMode.MULTIROW);
mainWindow.addComponent(t);
setMainWindow(mainWindow);
}
}
So in this example, if you select items 3 & 4, and then drag item 1, a new drag will initiate with record #1. Running Vaadin 6.7.9.
Let me know if I have something setup wrong.
Cheers,
~Ben
PS: I also noted that if I shift-select 3 items and drag them, the drag overlay only shows 1 record. When you command-select 3 items it shows all 3. This is purely a graphical issue though, where as the first issue I can't work around.
Is nobody else having this issue? This bug basically makes table drag and drop unusable.
Ben Lewis: The issue is, if a row is selected and you drag on another row (that is not selected) a drag will begin with the unselected row. My understanding is that if the DragMode is set to MULTIROW I should not be able to start a drag by dragging unselected items.
The behavior of Vaadin matches that of e.g. Windows Explorer and Nautilus on Linux - if you start a drag from an unselected item, only that item is dragged.
Hi Henri,
Oh wow you are right. I have never noticed this - to me that seems bizarre - surely the dragged row should become selected - anyway so its not a bug. Has the documentation been updated on this, I can't seem to find the reference to drags not starting if other rows are selected. PS: this drag behavior is the same on Mac OS X as well.
Thanks for your help!
~Ben