| Focus bug in Internet Explorer? [message #1745288] |
Fri, 07 October 2016 10:31 |
 Gunnar Adams
Messages: 49
Registered: May 2016 |
Member |
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Hi,
when trying to develop a fix for bug 398478, we found the following behavior, which can be reproduced in the RAP Workbench Demo application.
Start RAP Workbench Demo (do not maximize the Shell).
Open a new editor window.
Click in the editor /Set the focus to the editor.
Click outside of the Shell window.
Expectation:
Text Cursor should stay in the editor. The mouse click should not do anything.
Observation:
in Firefox: Works as expected
in Internet Explorer (11 on Windows 7): The text cursor vanishes. The field no longer receives key events.
Above expectation is in line with the code in
EventHandlerUtil.handleFocusedChild:
handleFocusedChild : function( target ) {
if( target.getEnabled() && !( target instanceof rwt.widgets.base.ClientDocument) ) {
rwt.widgets.util.FocusHandler.mouseFocus = true;
var root = target.getFocusRoot();
if( root ) {
var focusTarget = target;
while( !focusTarget.isFocusable() && focusTarget != root ) {
if( focusTarget instanceof rwt.widgets.MenuBar ) {
return;
}
focusTarget = focusTarget.getParent();
}
// We need to focus first and active afterwards.
// Otherwise the focus will activate another widget if the
// active one is not tabable.
rwt.event.EventHandler.setFocusRoot( root );
root.setFocusedChild( focusTarget );
root.setActiveChild( target );
}
}
},
The test for target being ClientDocument should prevent a focus change.
In fact, debugging showed, that root.setFocusedChild is not called (as expected) and that the active/focused control is not changed. Still, the focus in the IE browser is moved away from the field.
As mentioned above, I am working on a fix for several focus-related effects in connection with 398478 (click on shell titlebar removes focus from active widget in the same shell). The best I could come up with until now is the following test, which suffers from the same bug in Internet Explorer:
blockMouseFocus : function( target ) {
// test for click in Shell titlebar
if (target.getParent() instanceof rwt.widgets.base.HorizontalBoxLayout && target.getParent().getAppearance() == "window-captionbar") return true;
// additional attempt to prevent clicks on Composites/non-focussable widgets
//return (!target.getEnableElementFocus());
return false;
},
handleFocusedChild : function( target ) {
if( target.getEnabled() && !( target instanceof rwt.widgets.base.ClientDocument) && !this.blockMouseFocus(target) ) {
rwt.widgets.util.FocusHandler.mouseFocus = true;
var root = target.getFocusRoot();
if( root ) {
var focusTarget = target;
while( !focusTarget.isFocusable() && focusTarget != root ) {
if( focusTarget instanceof rwt.widgets.MenuBar ) {
return;
}
focusTarget = focusTarget.getParent();
}
// We need to focus first and active afterwards.
// Otherwise the focus will activate another widget if the
// active one is not tabable.
rwt.event.EventHandler.setFocusRoot( root );
root.setFocusedChild( focusTarget );
root.setActiveChild( target );
}
}
},
comments would be welcome.
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