Select multiple ListView item without pressing CTRL (Shortcut key) - javafx

Question

I'm trying to use a ListView in my application, which has to run on a Windows tablet. The problem is that, to select multiple item on a ListView, the user has to maintain the CTRL key pressed, which is impossible on a tablet.
So my question is : Is there a way to select multiple item in a ListView with a simple click on it?

Answer 1

You may filter the normal mouse Click event and convert it to Ctrl+Click. Actually to Shortcut+Click since the shortcut key may differ on the platform the app run.
EventHandler<MouseEvent> eventHandler = ( event ) ->
{
if ( !event.isShortcutDown() )
{
Event.fireEvent( event.getTarget(), cloneMouseEvent( event ) );
event.consume();
}
};
listview.getSelectionModel().setSelectionMode( SelectionMode.MULTIPLE );
listview.addEventFilter( MouseEvent.MOUSE_PRESSED, eventHandler );
listview.addEventFilter( MouseEvent.MOUSE_RELEASED, eventHandler );
where cloneMouseEvent is
private MouseEvent cloneMouseEvent( MouseEvent event )
{
switch (Toolkit.getToolkit().getPlatformShortcutKey())
{
case SHIFT:
return new MouseEvent(
event.getSource(),
event.getTarget(),
event.getEventType(),
event.getX(),
event.getY(),
event.getScreenX(),
event.getScreenY(),
event.getButton(),
event.getClickCount(),
true,
event.isControlDown(),
event.isAltDown(),
event.isMetaDown(),
event.isPrimaryButtonDown(),
event.isMiddleButtonDown(),
event.isSecondaryButtonDown(),
event.isSynthesized(),
event.isPopupTrigger(),
event.isStillSincePress(),
event.getPickResult()
);
case CONTROL:
return new MouseEvent(
event.getSource(),
event.getTarget(),
event.getEventType(),
event.getX(),
event.getY(),
event.getScreenX(),
event.getScreenY(),
event.getButton(),
event.getClickCount(),
event.isShiftDown(),
true,
event.isAltDown(),
event.isMetaDown(),
event.isPrimaryButtonDown(),
event.isMiddleButtonDown(),
event.isSecondaryButtonDown(),
event.isSynthesized(),
event.isPopupTrigger(),
event.isStillSincePress(),
event.getPickResult()
);
case ALT:
return new MouseEvent(
event.getSource(),
event.getTarget(),
event.getEventType(),
event.getX(),
event.getY(),
event.getScreenX(),
event.getScreenY(),
event.getButton(),
event.getClickCount(),
event.isShiftDown(),
event.isControlDown(),
true,
event.isMetaDown(),
event.isPrimaryButtonDown(),
event.isMiddleButtonDown(),
event.isSecondaryButtonDown(),
event.isSynthesized(),
event.isPopupTrigger(),
event.isStillSincePress(),
event.getPickResult()
);
case META:
return new MouseEvent(
event.getSource(),
event.getTarget(),
event.getEventType(),
event.getX(),
event.getY(),
event.getScreenX(),
event.getScreenY(),
event.getButton(),
event.getClickCount(),
event.isShiftDown(),
event.isControlDown(),
event.isAltDown(),
true,
event.isPrimaryButtonDown(),
event.isMiddleButtonDown(),
event.isSecondaryButtonDown(),
event.isSynthesized(),
event.isPopupTrigger(),
event.isStillSincePress(),
event.getPickResult()
);
default: // well return itself then
return event;
}
}