The previous article introduced Qt5 Virtual Keyboard compilation and size settings, now let’s take a look at how to make Qt keyboard implementation based on input controls Position and size while automatically adjusting your own position.

Qt5 Virtual Keyboard C++ Integration and Implementation II (Adaptive Position)

I. Implementation

inputcontex.h adds the following:

Q_PROPERTY(QRectF inputItemGeometry READ inputItemGeometry)
QRectF inputItemGeometry();

inputcontex.cpp增加如下内容:

QRectF InputContext::inputItemGeometry()
{
QWidget* pInputItem = (QWidget*)inputItem();
return pInputItem ? QRectF(((QWidget*)pInputItem->parent())->mapToGlobal(pInputItem->geometry().topLeft()), pInputItem->geometry().size()) : QRectF(0,0,0,0);
}

We use this function to get the position and size information of the current control.

InputPanel.qml add the following:

    anchors.horizontalCenter: parent.horizontalCenter
    width: Screen.desktopAvailableWidth * 2 / 3

    states: State {
        name: "visible";
        when: keyboard.active;
        PropertyChanges {
            target: keyboard;
            y: getInputY()
        }
    }
    transitions: Transition {
        from: "";
        to: "visible";
        reversible: true;
        ParallelAnimation {
            NumberAnimation {
                properties: "y";
                duration: 250;
                easing.type: Easing.InOutQuad;
            }
        }
    }
    function getInputY(){
        if(InputContext.inputItemGeometry.y + InputContext.inputItemGeometry.height + keyboard.height <= screenHeight){
            return InputContext.inputItemGeometry.y + InputContext.inputItemGeometry.height
        }
        else if(InputContext.inputItemGeometry.y - keyboard.height - 100 >= 0)
        {
            return InputContext.inputItemGeometry.y - keyboard.height - 50
        }
        else
        {
            return screenHeight - keyboard.height
        }
    }

We use the getInputY function to adjust the position of the Qt keyboard based on the position and size of the input control.