Qt where is the focus

When a key is pressed or released, a key event is generated and delivered to the focused Qt Quick Item. To facilitate the construction of reusable components and to address some of the cases unique to fluid user interfaces, the Qt Quick items add a scope based extension to Qt's traditional keyboard focus model.

If the Rectangle type in the following example has active focus and the A key is pressed, the event will not be propagated further. Upon pressing the B key, the event will propagate to the root item and thus be ignored.

See also the Keys attached property and KeyNavigation attached property. Whether or not an Item has active focus can be queried through the Item::activeFocus property. For example, here we have a Text type whose text is determined by whether or not it has active focus. An Item requests focus by setting the focus property to true. For very simple cases simply setting the focus property is sometimes sufficient. If we run the following example with qmlscene , we see that the keyHandler type has active focus and pressing the A , B , or C keys modifies the text appropriately.

However, were the above example to be used as a reusable or imported component, this simple use of the focus property is no longer sufficient. To demonstrate, we create two instances of our previously defined component and set the first one to have focus. The intention is that when the A , B , or C keys are pressed, the first of the two components receives the event and responds accordingly. We want the first MyWidget object to have the focus, so we set its focus property to true.

By rimie23 in forum Qt Programming. Replies: 20 Last Post: 5th June , Replies: 3 Last Post: 25th January , Window focus issues How to force focus to a window? By montylee in forum Qt Programming. Replies: 3 Last Post: 25th April , Bookmarks Bookmarks Digg del. Please note that additional White Glove fees may apply for non-standard installations. Your browser's Javascript functionality is turned off. Please turn it on so that you can experience the full capabilities of this site.

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The main concept to understand about focus handling in Qt is the focus policy. This attribute is set separately for each widget. It controls whether the widget can receive keyboard focus and how it can happen. A QWidget disables focus by default, but all widgets that want to get keyboard focus enable it in their constructors. Thus, the constructor of your widget is the correct place to set the focus policy.