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Home » Eclipse Projects » Standard Widget Toolkit (SWT) » No Mouse-Events from an open Combo -Box (Different behaviour on Windows XP / Linux GTK)
No Mouse-Events from an open Combo -Box [message #733421] Tue, 04 October 2011 13:19 Go to next message
Eclipse UserFriend
Hi,

I need a Combo(Box), that fires only Events, when the User is REALLY selecting an element, not when he browses the list with the Arrow-Keys (because some "expensive" work starts after the selection). So I added a Focus/Keyboard/Mouse-Listener to the Combo instead of the SelectionListener.
On Linux/GTK I get a "MouseUp"-Event wenn the user clicks on the combo, the Popup-List is displayed and a "MouseUp"-Event comes when the user clicks on the selected Item and I was happy...
But on Windows XP, I get a "MouseUp"-Event wenn the user clicks on the combo, the Popup-List is displayed and ... no more Mouse-Events, until the Popup is closed!???

Am I really the only one who has this Problem? Is this a Bug? Is there a Workaround?
Re: No Mouse-Events from an open Combo -Box [message #733575 is a reply to message #733421] Wed, 05 October 2011 01:23 Go to previous messageGo to next message
Eclipse UserFriend
What not use a comboviewer and a postselection listener to avoid the selection events on keyboard navigation altogether?
Re: No Mouse-Events from an open Combo -Box [message #733791 is a reply to message #733575] Wed, 05 October 2011 12:08 Go to previous messageGo to next message
Eclipse UserFriend
Hello vijay,

it's a long story why we don't use ComboViewers, we are developing and maintaining about 20 Java-Desktop Applications and have encapsulated the GUI-Technology (Swing/JSF/SWT) in our own framework. The Event-Handling is encapsulated too, so there's just one place in the code for 4 SWT-Apps with about 100 Combo-Widgets where we have to change the use of the Event-handling - that is much easier for us than changing 150 Combo-Widgets to ComboViewer/ContentProvider.
Re: No Mouse-Events from an open Combo -Box [message #1022532 is a reply to message #733421] Fri, 22 March 2013 00:25 Go to previous message
Eclipse UserFriend
I faced this problem as well and had to do a workaround. I added both a KeyListener and a SelectionListener to the Combo. Then I set a flag in the KeyListener's keyPressed callback when the UP/DOWN arrow keys are pressed (and unset it in the keyReleased callback). In the SelectionListener's widgetSelected callback, I check whether the flag has been set or not.

HTH,
Salman
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