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, 191 insertions, 0 deletions

diff --git a/tests/manual/qtabletevent/device_information/tabletwidget.cpp b/tests/manual/qtabletevent/device_information/tabletwidget.cpp
new file mode 100644
index 0000000000..15a3d8086a
--- /dev/null
+++ b/tests/manual/qtabletevent/device_information/tabletwidget.cpp
@@ -0,0 +1,191 @@
+/****************************************************************************
+**
+** 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 module 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 Technology Preview License Agreement accompanying
+** this package.
+**
+** 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 1.1, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "tabletwidget.h"
+#include <QPainter>
+#include <QApplication>
+
+TabletWidget::TabletWidget()
+{
+    QPalette newPalette = palette();
+    newPalette.setColor(QPalette::Window, Qt::white);
+    setPalette(newPalette);
+    qApp->installEventFilter(this);
+    resetAttributes();
+}
+
+bool TabletWidget::eventFilter(QObject *, QEvent *ev)
+{
+    switch (ev->type()) {
+    case QEvent::TabletEnterProximity:
+    case QEvent::TabletLeaveProximity:
+    case QEvent::TabletMove:
+    case QEvent::TabletPress:
+    case QEvent::TabletRelease:
+        {
+            QTabletEvent *event = static_cast<QTabletEvent*>(ev);
+            mType = event->type();
+            mPos = event->pos();
+            mGPos = event->globalPos();
+            mHiResGlobalPos = event->hiResGlobalPos();
+            mDev = event->device();
+            mPointerType = event->pointerType();
+            mUnique = event->uniqueId();
+            mXT = event->xTilt();
+            mYT = event->yTilt();
+            mZ = event->z();
+            mPress = event->pressure();
+            mTangential = event->tangentialPressure();
+            mRot = event->rotation();
+            if (isVisible())
+                update();
+            break;
+        }
+    case QEvent::MouseMove:
+        {
+            resetAttributes();
+            QMouseEvent *event = static_cast<QMouseEvent*>(ev);
+            mType = event->type();
+            mPos = event->pos();
+            mGPos = event->globalPos();
+        }
+    default:
+        break;
+    }
+    return false;
+}
+
+void TabletWidget::paintEvent(QPaintEvent *event)
+{
+    QPainter painter(this);
+
+    QStringList eventInfo;
+
+    QString typeString("Event type: ");
+    switch (mType) {
+    case QEvent::TabletEnterProximity:
+        typeString += "QEvent::TabletEnterProximity";
+        break;
+    case QEvent::TabletLeaveProximity:
+        typeString += "QEvent::TabletLeaveProximity";
+        break;
+    case QEvent::TabletMove:
+        typeString += "QEvent::TabletMove";
+        break;
+    case QEvent::TabletPress:
+        typeString += "QEvent::TabletPress";
+        break;
+    case QEvent::TabletRelease:
+        typeString += "QEvent::TabletRelease";
+        break;
+    case QEvent::MouseMove:
+        typeString += "QEvent::MouseMove";
+        break;
+    }
+    eventInfo << typeString;
+
+    eventInfo << QString("Global position: %1 %2").arg(QString::number(mGPos.x()), QString::number(mGPos.y()));
+    eventInfo << QString("Local position: %1 %2").arg(QString::number(mPos.x()), QString::number(mPos.y()));
+    if (mType == QEvent::TabletEnterProximity || mType == QEvent::TabletLeaveProximity
+        || mType == QEvent::TabletMove || mType == QEvent::TabletPress
+        || mType == QEvent::TabletRelease) {
+
+        eventInfo << QString("Hight res global position: %1 %2").arg(QString::number(mHiResGlobalPos.x()), QString::number(mHiResGlobalPos.y()));
+
+        QString pointerType("Pointer type: ");
+        switch (mPointerType) {
+        case QTabletEvent::UnknownPointer:
+            pointerType += "QTabletEvent::UnknownPointer";
+            break;
+        case QTabletEvent::Pen:
+            pointerType += "QTabletEvent::Pen";
+            break;
+        case QTabletEvent::Cursor:
+            pointerType += "QTabletEvent::Cursor";
+            break;
+        case QTabletEvent::Eraser:
+            pointerType += "QTabletEvent::Eraser";
+            break;
+        }
+        eventInfo << pointerType;
+
+
+        QString deviceString = "Device type: ";
+        switch (mDev) {
+        case QTabletEvent::NoDevice:
+            deviceString += "QTabletEvent::NoDevice";
+            break;
+        case QTabletEvent::Puck:
+            deviceString += "QTabletEvent::Puck";
+            break;
+        case QTabletEvent::Stylus:
+            deviceString += "QTabletEvent::Stylus";
+            break;
+        case QTabletEvent::Airbrush:
+            deviceString += "QTabletEvent::Airbrush";
+            break;
+        case QTabletEvent::FourDMouse:
+            deviceString += "QTabletEvent::FourDMouse";
+            break;
+        case QTabletEvent::RotationStylus:
+            deviceString += "QTabletEvent::RotationStylus";
+            break;
+        }
+        eventInfo << deviceString;
+
+        eventInfo << QString("Pressure: %1").arg(QString::number(mPress));
+        eventInfo << QString("Tangential pressure: %1").arg(QString::number(mTangential));
+        eventInfo << QString("Rotation: %1").arg(QString::number(mRot));
+        eventInfo << QString("xTilt: %1").arg(QString::number(mXT));
+        eventInfo << QString("yTilt: %1").arg(QString::number(mYT));
+        eventInfo << QString("z: %1").arg(QString::number(mZ));
+
+        eventInfo << QString("Unique Id: %1").arg(QString::number(mUnique));
+    }
+
+    painter.drawText(rect(), eventInfo.join("\n"));
+}
+
+void TabletWidget::tabletEvent(QTabletEvent *event)
+{
+    event->accept();
+}
+