1 files changed, 224 insertions, 0 deletions
diff --git a/Source/WebKit2/UIProcess/gtk/GestureController.cpp b/Source/WebKit2/UIProcess/gtk/GestureController.cpp
new file mode 100644
index 000000000..7e1577cba
--- /dev/null
+++ b/Source/WebKit2/UIProcess/gtk/GestureController.cpp
@@ -0,0 +1,224 @@
+/*
+ * Copyright (C) 2014 Igalia S.L.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "GestureController.h"
+
+#if HAVE(GTK_GESTURES)
+
+#include "NativeWebMouseEvent.h"
+#include "NativeWebWheelEvent.h"
+#include "WebPageProxy.h"
+#include <WebCore/FloatPoint.h>
+#include <WebCore/Scrollbar.h>
+#include <gtk/gtk.h>
+
+using namespace WebCore;
+
+namespace WebKit {
+
+GestureController::GestureController(WebPageProxy& page)
+    : m_dragGesture(page)
+    , m_zoomGesture(page)
+{
+}
+
+bool GestureController::handleEvent(const GdkEvent* event)
+{
+    bool wasProcessingGestures = isProcessingGestures();
+    m_dragGesture.handleEvent(event);
+    m_zoomGesture.handleEvent(event);
+    return event->type == GDK_TOUCH_END ? wasProcessingGestures : isProcessingGestures();
+}
+
+bool GestureController::isProcessingGestures() const
+{
+    return m_dragGesture.isActive() || m_zoomGesture.isActive();
+}
+
+GestureController::Gesture::Gesture(GtkGesture* gesture, WebPageProxy& page)
+    : m_gesture(adoptGRef(gesture))
+    , m_page(page)
+{
+    gtk_event_controller_set_propagation_phase(GTK_EVENT_CONTROLLER(m_gesture.get()), GTK_PHASE_NONE);
+}
+
+bool GestureController::Gesture::isActive() const
+{
+    return gtk_gesture_is_active(m_gesture.get());
+}
+
+void GestureController::Gesture::handleEvent(const GdkEvent* event)
+{
+    gtk_event_controller_handle_event(GTK_EVENT_CONTROLLER(m_gesture.get()), event);
+}
+
+void GestureController::DragGesture::handleDrag(const GdkEvent* event, double x, double y)
+{
+    ASSERT(m_inDrag);
+    GUniquePtr<GdkEvent> scrollEvent(gdk_event_new(GDK_SCROLL));
+    scrollEvent->scroll.time = event->touch.time;
+    scrollEvent->scroll.x = m_start.x();
+    scrollEvent->scroll.y = m_start.y();
+    scrollEvent->scroll.x_root = event->touch.x_root;
+    scrollEvent->scroll.y_root = event->touch.y_root;
+    scrollEvent->scroll.direction = GDK_SCROLL_SMOOTH;
+    scrollEvent->scroll.delta_x = (m_offset.x() - x) / Scrollbar::pixelsPerLineStep();
+    scrollEvent->scroll.delta_y = (m_offset.y() - y) / Scrollbar::pixelsPerLineStep();
+    scrollEvent->scroll.state = event->touch.state;
+    m_page.handleWheelEvent(NativeWebWheelEvent(scrollEvent.get()));
+}
+
+void GestureController::DragGesture::handleTap(const GdkEvent* event)
+{
+    ASSERT(!m_inDrag);
+    GUniquePtr<GdkEvent> pointerEvent(gdk_event_new(GDK_MOTION_NOTIFY));
+    pointerEvent->motion.time = event->touch.time;
+    pointerEvent->motion.x = event->touch.x;
+    pointerEvent->motion.y = event->touch.y;
+    pointerEvent->motion.x_root = event->touch.x_root;
+    pointerEvent->motion.y_root = event->touch.y_root;
+    pointerEvent->motion.state = event->touch.state;
+    m_page.handleMouseEvent(NativeWebMouseEvent(pointerEvent.get(), 0));
+
+    pointerEvent.reset(gdk_event_new(GDK_BUTTON_PRESS));
+    pointerEvent->button.button = 1;
+    pointerEvent->button.time = event->touch.time;
+    pointerEvent->button.x = event->touch.x;
+    pointerEvent->button.y = event->touch.y;
+    pointerEvent->button.x_root = event->touch.x_root;
+    pointerEvent->button.y_root = event->touch.y_root;
+    m_page.handleMouseEvent(NativeWebMouseEvent(pointerEvent.get(), 1));
+
+    pointerEvent->type = GDK_BUTTON_RELEASE;
+    m_page.handleMouseEvent(NativeWebMouseEvent(pointerEvent.get(), 0));
+}
+
+void GestureController::DragGesture::begin(DragGesture* dragGesture, double x, double y, GtkGesture* gesture)
+{
+    GdkEventSequence* sequence = gtk_gesture_single_get_current_sequence(GTK_GESTURE_SINGLE(gesture));
+    gtk_gesture_set_sequence_state(gesture, sequence, GTK_EVENT_SEQUENCE_CLAIMED);
+    dragGesture->m_inDrag = false;
+    dragGesture->m_start.set(x, y);
+    dragGesture->m_offset.set(0, 0);
+
+    GtkWidget* widget = gtk_event_controller_get_widget(GTK_EVENT_CONTROLLER(gesture));
+    unsigned delay;
+    g_object_get(gtk_widget_get_settings(widget), "gtk-long-press-time", &delay, nullptr);
+    dragGesture->m_longPressTimeout.startOneShot(delay / 1000.0);
+}
+
+void GestureController::DragGesture::update(DragGesture* dragGesture, double x, double y, GtkGesture* gesture)
+{
+    GdkEventSequence* sequence = gtk_gesture_single_get_current_sequence(GTK_GESTURE_SINGLE(gesture));
+    gtk_gesture_set_sequence_state(gesture, sequence, GTK_EVENT_SEQUENCE_CLAIMED);
+
+    GtkWidget* widget = gtk_event_controller_get_widget(GTK_EVENT_CONTROLLER(gesture));
+    if (!dragGesture->m_inDrag && gtk_drag_check_threshold(widget, dragGesture->m_start.x(), dragGesture->m_start.y(), dragGesture->m_start.x() + x, dragGesture->m_start.y() + y)) {
+        dragGesture->m_inDrag = true;
+        dragGesture->m_longPressTimeout.stop();
+    }
+
+    if (dragGesture->m_inDrag)
+        dragGesture->handleDrag(gtk_gesture_get_last_event(gesture, sequence), x, y);
+    dragGesture->m_offset.set(x, y);
+}
+
+void GestureController::DragGesture::end(DragGesture* dragGesture, GdkEventSequence* sequence, GtkGesture* gesture)
+{
+    dragGesture->m_longPressTimeout.stop();
+    if (!dragGesture->m_inDrag) {
+        dragGesture->handleTap(gtk_gesture_get_last_event(gesture, sequence));
+        gtk_gesture_set_state(gesture, GTK_EVENT_SEQUENCE_DENIED);
+    } else if (!gtk_gesture_handles_sequence(gesture, sequence))
+        gtk_gesture_set_state(gesture, GTK_EVENT_SEQUENCE_DENIED);
+}
+
+void GestureController::DragGesture::longPressFired()
+{
+    m_inDrag = true;
+}
+
+GestureController::DragGesture::DragGesture(WebPageProxy& page)
+    : Gesture(gtk_gesture_drag_new(page.viewWidget()), page)
+    , m_longPressTimeout(RunLoop::main(), this, &GestureController::DragGesture::longPressFired)
+    , m_inDrag(false)
+{
+    gtk_gesture_single_set_touch_only(GTK_GESTURE_SINGLE(m_gesture.get()), TRUE);
+    g_signal_connect_swapped(m_gesture.get(), "drag-begin", G_CALLBACK(begin), this);
+    g_signal_connect_swapped(m_gesture.get(), "drag-update", G_CALLBACK(update), this);
+    g_signal_connect_swapped(m_gesture.get(), "end", G_CALLBACK(end), this);
+}
+
+IntPoint GestureController::ZoomGesture::center() const
+{
+    double x, y;
+    gtk_gesture_get_bounding_box_center(m_gesture.get(), &x, &y);
+    return IntPoint(x, y);
+}
+
+void GestureController::ZoomGesture::begin(ZoomGesture* zoomGesture, GdkEventSequence*, GtkGesture* gesture)
+{
+    gtk_gesture_set_state(gesture, GTK_EVENT_SEQUENCE_CLAIMED);
+
+    zoomGesture->m_initialScale = zoomGesture->m_page.pageScaleFactor();
+    zoomGesture->m_page.getCenterForZoomGesture(zoomGesture->center(), zoomGesture->m_initialPoint);
+}
+
+void GestureController::ZoomGesture::handleZoom()
+{
+    IntPoint scaledOriginOffset = m_viewPoint;
+    scaledOriginOffset.scale(1 / m_scale, 1 / m_scale);
+
+    IntPoint newOrigin = m_initialPoint;
+    newOrigin.moveBy(-scaledOriginOffset);
+    newOrigin.scale(m_scale, m_scale);
+
+    m_page.scalePage(m_scale, newOrigin);
+}
+
+void GestureController::ZoomGesture::scaleChanged(ZoomGesture* zoomGesture, double scale, GtkGesture*)
+{
+    zoomGesture->m_scale = zoomGesture->m_initialScale * scale;
+    zoomGesture->m_viewPoint = zoomGesture->center();
+    if (zoomGesture->m_idle.isActive())
+        return;
+
+    zoomGesture->m_idle.startOneShot(0);
+}
+
+GestureController::ZoomGesture::ZoomGesture(WebPageProxy& page)
+    : Gesture(gtk_gesture_zoom_new(page.viewWidget()), page)
+    , m_initialScale(0)
+    , m_scale(0)
+    , m_idle(RunLoop::main(), this, &GestureController::ZoomGesture::handleZoom)
+{
+    g_signal_connect_swapped(m_gesture.get(), "begin", G_CALLBACK(begin), this);
+    g_signal_connect_swapped(m_gesture.get(), "scale-changed", G_CALLBACK(scaleChanged), this);
+}
+
+} // namespace WebKit
+
+#endif // HAVE(GTK_GESTURES)