Removed the QTapAndHoldGesture

Moved the gesture implementation to the imageviewer example as it cannot be
fully implemented in a crossplatform way - for example on Windows tap and hold
is a system gesture that is transparent to the application.

Reviewed-by: trustme

5 files changed, 151 insertions, 8 deletions

diff --git a/examples/gestures/imageviewer/imageviewer.pro b/examples/gestures/imageviewer/imageviewer.pro
index 4c35dce..efbca00 100644
--- a/examples/gestures/imageviewer/imageviewer.pro
+++ b/examples/gestures/imageviewer/imageviewer.pro
@@ -1,12 +1,11 @@
-######################################################################
-# Automatically generated by qmake (2.01a) Thu Sep 11 17:18:17 2008
-######################################################################
-
 TEMPLATE = app
 TARGET =
 DEPENDPATH += .
 INCLUDEPATH += .
 
 # Input
-HEADERS += imagewidget.h
-SOURCES += imagewidget.cpp main.cpp
+HEADERS += imagewidget.h \
+    tapandholdgesture.h
+SOURCES += imagewidget.cpp \
+    tapandholdgesture.cpp \
+    main.cpp
diff --git a/examples/gestures/imageviewer/imagewidget.cpp b/examples/gestures/imageviewer/imagewidget.cpp
index 0b39997..99889ed 100644
--- a/examples/gestures/imageviewer/imagewidget.cpp
+++ b/examples/gestures/imageviewer/imagewidget.cpp
@@ -65,7 +65,7 @@ ImageWidget::ImageWidget(QWidget *parent)
     panGesture = new QPanGesture(this);
     connect(panGesture, SIGNAL(triggered()), this, SLOT(gestureTriggered()));
 
-    tapAndHoldGesture = new QTapAndHoldGesture(this);
+    tapAndHoldGesture = new TapAndHoldGesture(this);
     connect(tapAndHoldGesture, SIGNAL(triggered()), this, SLOT(gestureTriggered()));
 }
 
@@ -188,6 +188,19 @@ void ImageWidget::gestureTriggered()
             }
         }
         feedbackFadeOutTimer.start(500, this);
+    } else if (sender() == tapAndHoldGesture) {
+        if (tapAndHoldGesture->state() == Qt::GestureFinished) {
+            qDebug() << "tap and hold detected";
+            touchFeedback.reset();
+            update();
+
+            QMenu menu;
+            menu.addAction("Action 1");
+            menu.addAction("Action 2");
+            menu.addAction("Action 3");
+            menu.exec(mapToGlobal(tapAndHoldGesture->pos()));
+        }
+        feedbackFadeOutTimer.start(500, this);
     }
 }
 
diff --git a/examples/gestures/imageviewer/imagewidget.h b/examples/gestures/imageviewer/imagewidget.h
index e12634d..d8d5f8d 100644
--- a/examples/gestures/imageviewer/imagewidget.h
+++ b/examples/gestures/imageviewer/imagewidget.h
@@ -48,6 +48,8 @@
 
 #include <QtGui>
 
+#include "tapandholdgesture.h"
+
 class ImageWidget : public QWidget
 {
     Q_OBJECT
@@ -79,7 +81,7 @@ private:
     void goToImage(int index);
 
     QPanGesture *panGesture;
-    QTapAndHoldGesture *tapAndHoldGesture;
+    TapAndHoldGesture *tapAndHoldGesture;
 
     QString path;
     QStringList files;
diff --git a/examples/gestures/imageviewer/tapandholdgesture.cpp b/examples/gestures/imageviewer/tapandholdgesture.cpp
new file mode 100644
index 0000000..c6f6779
--- /dev/null
+++ b/examples/gestures/imageviewer/tapandholdgesture.cpp
@@ -0,0 +1,97 @@
+#include "tapandholdgesture.h"
+
+#include <QtGui/qevent.h>
+
+/*!
+    \class TapAndHoldGesture
+    \since 4.6
+
+    \brief The TapAndHoldGesture class represents a Tap-and-Hold gesture,
+    providing additional information.
+*/
+
+const int TapAndHoldGesture::iterationCount = 40;
+const int TapAndHoldGesture::iterationTimeout = 50;
+
+/*!
+    Creates a new Tap and Hold gesture handler object and marks it as a child
+    of \a parent.
+
+    On some platforms like Windows there is a system-wide tap and hold gesture
+    that cannot be overriden, hence the gesture might never trigger and default
+    context menu will be shown instead.
+*/
+TapAndHoldGesture::TapAndHoldGesture(QWidget *parent)
+    : QGesture(parent), iteration(0)
+{
+}
+
+/*! \internal */
+bool TapAndHoldGesture::filterEvent(QEvent *event)
+{
+    if (!event->spontaneous())
+        return false;
+    const QTouchEvent *ev = static_cast<const QTouchEvent*>(event);
+    switch (event->type()) {
+    case QEvent::TouchBegin: {
+        if (timer.isActive())
+            timer.stop();
+        timer.start(TapAndHoldGesture::iterationTimeout, this);
+        const QPoint p = ev->touchPoints().at(0).pos().toPoint();
+        position = p;
+        break;
+    }
+    case QEvent::TouchUpdate:
+        if (ev->touchPoints().size() == 1) {
+            const QPoint startPos = ev->touchPoints().at(0).startPos().toPoint();
+            const QPoint pos = ev->touchPoints().at(0).pos().toPoint();
+            if ((startPos - pos).manhattanLength() > 15)
+                reset();
+        } else {
+            reset();
+        }
+        break;
+    case QEvent::TouchEnd:
+        reset();
+        break;
+    default:
+        break;
+    }
+    return false;
+}
+
+/*! \internal */
+void TapAndHoldGesture::timerEvent(QTimerEvent *event)
+{
+    if (event->timerId() != timer.timerId())
+        return;
+    if (iteration == TapAndHoldGesture::iterationCount) {
+        timer.stop();
+        setState(Qt::GestureFinished);
+        emit triggered();
+    } else {
+        setState(Qt::GestureStarted);
+        emit triggered();
+    }
+    ++iteration;
+}
+
+/*! \internal */
+void TapAndHoldGesture::reset()
+{
+    if (state() != Qt::NoGesture)
+        emit cancelled();
+    setState(Qt::NoGesture);
+    timer.stop();
+    iteration = 0;
+}
+
+/*!
+    \property TapAndHoldGesture::pos
+
+    \brief The position of the gesture.
+*/
+QPoint TapAndHoldGesture::pos() const
+{
+    return position;
+}
diff --git a/examples/gestures/imageviewer/tapandholdgesture.h b/examples/gestures/imageviewer/tapandholdgesture.h
new file mode 100644
index 0000000..711a1af
--- /dev/null
+++ b/examples/gestures/imageviewer/tapandholdgesture.h
@@ -0,0 +1,32 @@
+#ifndef TAPANDHOLDGESTURE_H
+#define TAPANDHOLDGESTURE_H
+
+#include <QtCore/QBasicTimer>
+#include <QtGui/QGesture>
+#include <QtGui/QWidget>
+
+class TapAndHoldGesture : public QGesture
+{
+    Q_OBJECT
+    Q_PROPERTY(QPoint pos READ pos)
+
+public:
+    TapAndHoldGesture(QWidget *parent);
+
+    bool filterEvent(QEvent *event);
+    void reset();
+
+    QPoint pos() const;
+
+protected:
+    void timerEvent(QTimerEvent *event);
+
+private:
+    QBasicTimer timer;
+    int iteration;
+    QPoint position;
+    static const int iterationCount;
+    static const int iterationTimeout;
+};
+
+#endif // TAPANDHOLDGESTURE_H