Disable event compression when the tablet events are accepted

Since Qt 4.5, all tablet events are compressed not to overload the
widgets with the corresponding mouse event (a mouse event is generated
if the tablet event is not accepted).

This behavior reduce the precision when drawing on a widget that use
the tablet events. All tablet events should be sent to the widget that
are accepting the tablet event.

With this patch, the tablet event are filtered only if the widget
ignore the first tablet event. The mouse events are compressed.

There is two special cases for the filtering:

First, if a tablet event is for another widget than the one
ignoring the tablet, this event should not be filtered.

Second, if there is a mouse press event, the mouse move event should be
sent to the widget that received the mouse press event.

Helped-by: Pierre Rossi
Reviewed-by: Thomas Zander
Reviewed-by: Bradley T. Hughes

1 files changed, 73 insertions, 0 deletions

diff --git a/tests/manual/qtabletevent/device_information/tabletwidget.h b/tests/manual/qtabletevent/device_information/tabletwidget.h
new file mode 100644
index 0000000..b16e9ed
--- /dev/null
+++ b/tests/manual/qtabletevent/device_information/tabletwidget.h
@@ -0,0 +1,73 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
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+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef TABLETWIDGET_H
+#define TABLETWIDGET_H
+
+#include <QWidget>
+#include <QTabletEvent>
+
+// a widget showing the information of the last tablet event
+class TabletWidget : public QWidget
+{
+public:
+    TabletWidget();
+protected:
+    bool eventFilter(QObject *obj, QEvent *ev);
+    void tabletEvent(QTabletEvent *event);
+    void paintEvent(QPaintEvent *event);
+private:
+    void resetAttributes() {
+        mType = mDev = mPointerType = mXT = mYT = mZ = 0;
+        mPress = mTangential = mRot = 0.0;
+        mPos = mGPos = QPoint();
+        mHiResGlobalPos = QPointF();
+        mUnique = 0;
+    }
+    int mType;
+    QPoint mPos, mGPos;
+    QPointF mHiResGlobalPos;
+    int mDev, mPointerType, mXT, mYT, mZ;
+    qreal mPress, mTangential, mRot;
+    qint64 mUnique;
+};
+
+#endif // TABLETWIDGET_H