Workaround to hide VKB in QML apps (Known Issue)
(Gnuton - - →Pure QML Solution)
(Gnuton - - →C++ Solution)
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== C++ Solution ==
== C++ Solution ==
Revision as of 13:00, 28 October 2011
This article explains how to close the virtual keyboard in pure QML apps
Pure QML application on Harmattan suffer of a bug which is quite annoying. The bug I'm talking about is related to the Virtual Keyboard (VKB). Basically when a QML element able to listen for key events receives the focus, a virtual keyboard shows up and user can enter the text in the element by tapping on the keyboard itself. When user finished to insert text and tap outside the element, the previous element doesn't actually lose the focus and the keyboard is not closed automatically going against the logic way of usage and against the Harmattan guide lines. This is not just annoying, but mess up the vocabulary other than the usability.
In this page we will talk about how to work around this, and which solutions are available.
Pure QML Solution
Many and many times you could have heard that to get around this problem you should use closeSoftwareInputPanel QML method. Well, here is an example which shows you how to use it. The example below is the implementation of this fix inside a simple QML app made up by a root Rectangle element and a textedit. The virtual keyboard is shown when the textedit is clicked, but the virtual keyboard is not hidden when the user taps outside. The main problem here is related to the focus. Tapping outside the textedit element is not enough to change the focus and close the VKB, so we have to add some code to fulfill these duties. The fix is implemented basically in two parts.
- MouseArea - a big and transparent to events Mousarea overlays the entire application. This allows us to give the focus to the clicked item
- onActiveFocusChanged slot inside the any element able to receive text input. This slot actually close the VKB
The rest of example is pretty simple and the complete code can be seen in the block of code below.
import QtQuick 1.0
if (!mText.activeFocus) mText.closeSoftwareInputPanel();
// Let the mousePress events go to below items
mouse.accepted = false;
// Clicked item below the MouseArea gets the focus
var selectedItem = root.childAt(mouse.x, mouse.y);
if (!selectedItem) selectedItem = root;
selectedItem.focus = true;
MeeGo Components are not affected!
While this bug affects plain QML apps, MeeGo component based apps are not affected by this bug at all! So if possibl you should use the Meego elements set instead of the standard QML ones. The only one drawback here is the compatibility with Symbian set. In fact, if your target is to run the app both on Symbian and MeeGo polatforms then the solution shown before is the right way to go.