QQuickAbstractButton: handle touch events

This makes it possible to interact with multiple buttons at the same
time.

Change-Id: Ice17efcb8b6dc5337455cd38ee88c39dfef2baae
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>

3 files changed, 64 insertions, 1 deletions

diff --git a/src/quicktemplates2/qquickabstractbutton.cpp b/src/quicktemplates2/qquickabstractbutton.cpp
index d8810fcd..17e0abea 100644
--- a/src/quicktemplates2/qquickabstractbutton.cpp
+++ b/src/quicktemplates2/qquickabstractbutton.cpp
@@ -121,6 +121,7 @@ QQuickAbstractButtonPrivate::QQuickAbstractButtonPrivate()
       autoExclusive(false),
       autoRepeat(false),
       wasHeld(false),
+      touchId(-1),
       holdTimer(0),
       delayTimer(0),
       repeatTimer(0),
@@ -164,6 +165,7 @@ void QQuickAbstractButtonPrivate::handleRelease(const QPointF &point)
     Q_Q(QQuickAbstractButton);
     bool wasPressed = pressed;
     q->setPressed(false);
+    touchId = -1;
 
     if (!wasHeld && (keepPressed || q->contains(point)))
         q->nextCheckState();
@@ -189,6 +191,7 @@ void QQuickAbstractButtonPrivate::handleCancel()
         return;
 
     q->setPressed(false);
+    touchId = -1;
     stopPressRepeat();
     stopPressAndHold();
     emit q->canceled();
@@ -659,6 +662,63 @@ void QQuickAbstractButton::timerEvent(QTimerEvent *event)
     }
 }
 
+void QQuickAbstractButton::touchEvent(QTouchEvent *event)
+{
+    Q_D(QQuickAbstractButton);
+    switch (event->type()) {
+    case QEvent::TouchBegin:
+        if (d->touchId == -1) {
+            const QTouchEvent::TouchPoint point = event->touchPoints().first();
+            d->touchId = point.id();
+            d->handlePress(point.pos());
+        }
+        break;
+
+    case QEvent::TouchUpdate:
+        for (const QTouchEvent::TouchPoint &point : event->touchPoints()) {
+            if (point.id() != d->touchId)
+                continue;
+
+            switch (point.state()) {
+            case Qt::TouchPointPressed:
+                d->handlePress(point.pos());
+                break;
+            case Qt::TouchPointMoved:
+                d->handleMove(point.pos());
+                break;
+            case Qt::TouchPointReleased:
+                d->handleRelease(point.pos());
+                break;
+            default:
+                break;
+            }
+        }
+        break;
+
+    case QEvent::TouchEnd:
+        for (const QTouchEvent::TouchPoint &point : event->touchPoints()) {
+            if (point.id() == d->touchId)
+                d->handleRelease(point.pos());
+        }
+        break;
+
+    case QEvent::TouchCancel:
+        d->handleCancel();
+        break;
+
+    default:
+        QQuickControl::touchEvent(event);
+        break;
+    }
+}
+
+void QQuickAbstractButton::touchUngrabEvent()
+{
+    Q_D(QQuickAbstractButton);
+    QQuickControl::touchUngrabEvent();
+    d->handleCancel();
+}
+
 void QQuickAbstractButton::buttonChange(ButtonChange change)
 {
     Q_D(QQuickAbstractButton);
diff --git a/src/quicktemplates2/qquickabstractbutton_p.h b/src/quicktemplates2/qquickabstractbutton_p.h
index 31b306af..82da94bd 100644
--- a/src/quicktemplates2/qquickabstractbutton_p.h
+++ b/src/quicktemplates2/qquickabstractbutton_p.h
@@ -125,6 +125,8 @@ protected:
     void mouseDoubleClickEvent(QMouseEvent *event) override;
     void mouseUngrabEvent() override;
     void timerEvent(QTimerEvent *event) override;
+    void touchEvent(QTouchEvent *event) override;
+    void touchUngrabEvent() override;
 
     enum ButtonChange {
         ButtonAutoRepeatChange,
diff --git a/src/quicktemplates2/qquickabstractbutton_p_p.h b/src/quicktemplates2/qquickabstractbutton_p_p.h
index cca7d200..e27f5c82 100644
--- a/src/quicktemplates2/qquickabstractbutton_p_p.h
+++ b/src/quicktemplates2/qquickabstractbutton_p_p.h
@@ -67,7 +67,7 @@ public:
         return button->d_func();
     }
 
-    virtual void handlePress(const QPointF &point, Qt::MouseButton button, Qt::MouseButtons buttons);
+    virtual void handlePress(const QPointF &point, Qt::MouseButton button = Qt::LeftButton, Qt::MouseButtons buttons = Qt::LeftButton);
     virtual void handleMove(const QPointF &point);
     virtual void handleRelease(const QPointF &point);
     virtual void handleCancel();
@@ -95,6 +95,7 @@ public:
     bool autoExclusive;
     bool autoRepeat;
     bool wasHeld;
+    int touchId;
     int holdTimer;
     int delayTimer;
     int repeatTimer;