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ev-view: Add pinch/zoom gesture to handle document zooming

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This is delegated on a GtkGestureZoom. When triggered, the document
will be zoomed based on the distance changes between both fingers.
When the gesture is not active, regular event handling (text selection,
clicking, etc...) will happen.
This commit is contained in:
Carlos Garnacho 2014-03-28 19:55:03 +01:00
parent 96e7b9676d
commit 36c7f21f5c
2 changed files with 53 additions and 1 deletions
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4
libview/ev-view-private.h
View File

@ -222,6 +222,10 @@ struct _EvView {
gboolean cursor_visible;
guint cursor_blink_timeout_id;
guint cursor_blink_time;
/* Gestures */
GtkGesture *zoom_gesture;
gdouble prev_zoom_gesture_scale;
};
struct _EvViewClass {

50
libview/ev-view.c
View File

@ -4707,7 +4707,10 @@ ev_view_button_press_event (GtkWidget *widget,
if (!view->document)
return FALSE;
if (gtk_gesture_is_recognized (view->zoom_gesture))
return TRUE;
if (!gtk_widget_has_focus (widget)) {
gtk_widget_grab_focus (widget);
}
@ -5028,6 +5031,9 @@ ev_view_motion_notify_event (GtkWidget *widget,
if (!view->document)
return FALSE;
if (gtk_gesture_is_recognized (view->zoom_gesture))
return TRUE;
window = gtk_widget_get_window (widget);
if (event->is_hint || event->window != window) {
@ -5184,6 +5190,9 @@ ev_view_button_release_event (GtkWidget *widget,
view->image_dnd_info.in_drag = FALSE;
if (gtk_gesture_is_recognized (view->zoom_gesture))
return TRUE;
if (view->scroll_info.autoscrolling) {
ev_view_autoscroll_stop (view);
view->pressed_button = -1;
@ -6303,6 +6312,8 @@ ev_view_finalize (GObject *object)
g_object_unref (view->image_dnd_info.image);
view->image_dnd_info.image = NULL;
g_object_unref (view->zoom_gesture);
G_OBJECT_CLASS (ev_view_parent_class)->finalize (object);
}
@ -6985,6 +6996,33 @@ on_notify_scale_factor (EvView *view,
view_update_range_and_current_page (view);
}
static void
zoom_gesture_begin_cb (GtkGesture *gesture,
GdkEventSequence *sequence,
EvView *view)
{
view->prev_zoom_gesture_scale = 1;
}
static void
zoom_gesture_scale_changed_cb (GtkGestureZoom *gesture,
gdouble scale,
EvView *view)
{
gdouble factor;
view->drag_info.in_drag = FALSE;
view->image_dnd_info.in_drag = FALSE;
factor = scale - view->prev_zoom_gesture_scale + 1;
view->prev_zoom_gesture_scale = scale;
ev_document_model_set_sizing_mode (view->model, EV_SIZING_FREE);
if ((factor < 1.0 && ev_view_can_zoom_out (view)) ||
(factor >= 1.0 && ev_view_can_zoom_in (view)))
ev_view_zoom (view, factor);
}
static void
ev_view_init (EvView *view)
{
@ -7000,6 +7038,7 @@ ev_view_init (EvView *view)
gtk_style_context_add_class (context, "view");
gtk_widget_set_events (GTK_WIDGET (view),
GDK_TOUCH_MASK |
GDK_EXPOSURE_MASK |
GDK_BUTTON_PRESS_MASK |
GDK_BUTTON_RELEASE_MASK |
@ -7037,6 +7076,15 @@ ev_view_init (EvView *view)
g_signal_connect (view, "notify::scale-factor",
G_CALLBACK (on_notify_scale_factor), NULL);
view->zoom_gesture = gtk_gesture_zoom_new (GTK_WIDGET (view));
gtk_event_controller_set_propagation_phase (GTK_EVENT_CONTROLLER (view->zoom_gesture),
GTK_PHASE_CAPTURE);
g_signal_connect (view->zoom_gesture, "begin",
G_CALLBACK (zoom_gesture_begin_cb), view);
g_signal_connect (view->zoom_gesture, "scale-changed",
G_CALLBACK (zoom_gesture_scale_changed_cb), view);
}
/*** Callbacks ***/