[solved] Retrieve window geometry

? Offline

Hi,

I'm hacking around the missing support for (Wacom) graphics tablets in QtQuick. This is my component:

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import QtQuick 2.4
import domain.program 1.6 // TabletMessage

Item {
id: tabletArea

property real rootX: 0 // myWindow.x
property real rootY: 0 // myWindow.y

signal messageReceived( TabletMessage msg )

// private

function handleTabletMessage( msg ) {
    var xx = msg.globalPos().x - rootX
    var yy = msg.globalPos().y - rootY
    var pos = mapFromItem( null, xx, yy )
    msg.setPos( Qt.point( pos.x, pos.y ) )
    messageReceived( msg )
}

Component.onCompleted: tabletEventFilter.messageReceived.connect( handleTabletMessage )

}
@

The component needs to know the x and y screen coordinates of the window that it's a child of. Currently I supply it with this info by setting the properties rootX and rootY from its parent item. That's pretty ugly.

Is there a QtQuick component that can give me the requested coordinates directly? Something like QtQuick.Window's "Screen" item but for the current window?

? Offline

I found a solution. QQuickItem has access to its parent window via:

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QQuickWindow * QQuickItem::window() const
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So I've written a mini class, that's derived from QQuickItem and gives QML code access to the window's screen coordinates:

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#ifndef WINDOWINFOITEM_H
#define WINDOWINFOITEM_H

#include <QQuickItem>
#include <QQuickWindow>

class WindowInfoItem : public QQuickItem
{
Q_OBJECT
public:
WindowInfoItem();
~WindowInfoItem();

Q_INVOKABLE int globalX() const { return window()->x(); }
Q_INVOKABLE int globalY() const { return window()->y(); }

};

#endif // WINDOWINFOITEM_H
@

The component from my first post now looks like this:

@
import QtQuick 2.4
import domain.program 1.6 // TabletMessage, WindowInfoItem

WindowInfoItem {
id: tabletArea

signal messageReceived( TabletMessage msg )

// private

function handleTabletMessage( msg ) {
    var xx = msg.globalPos().x - globalX()
    var yy = msg.globalPos().y - globalY()
    var pos = mapFromItem( null, xx, yy )
    msg.setPos( Qt.point( pos.x, pos.y ) )
    messageReceived( msg )
}

Component.onCompleted: tabletEventFilter.messageReceived.connect( handleTabletMessage )

}
@