[gtk+/gestures: 53/55] treeview: Use multipress gesture for row activation

[Carlos Garnacho <carlosg src gnome org>]

commit 28acd180b7f853753e925d9a10aa56454530d4a5
Author: Carlos Garnacho <carlosg gnome org>
Date:   Thu Mar 27 12:31:28 2014 +0100

    treeview: Use multipress gesture for row activation
    
    Replace custom double click detection with multipress gesture

 gtk/gtktreeview.c |  108 ++++++++++++++++++++++------------------------------
 1 files changed, 46 insertions(+), 62 deletions(-)
---
diff --git a/gtk/gtktreeview.c b/gtk/gtktreeview.c
index e31b867..b7f63fb 100644
--- a/gtk/gtktreeview.c
+++ b/gtk/gtktreeview.c
@@ -442,6 +442,10 @@ struct _GtkTreeViewPrivate
   gpointer row_separator_data;
   GDestroyNotify row_separator_destroy;
 
+  /* Gestures */
+  GtkGesture *multipress_gesture;
+  GtkGesture *drag_gesture;
+
   /* Tooltip support */
   gint tooltip_column;
 
@@ -888,6 +892,8 @@ static gboolean scroll_row_timeout                   (gpointer     data);
 static void     add_scroll_timeout                   (GtkTreeView *tree_view);
 static void     remove_scroll_timeout                (GtkTreeView *tree_view);
 
+static void     grab_focus_and_unset_draw_keyfocus   (GtkTreeView *tree_view);
+
 static guint tree_view_signals [LAST_SIGNAL] = { 0 };
 
 
@@ -1735,6 +1741,38 @@ gtk_tree_view_class_init (GtkTreeViewClass *class)
 }
 
 static void
+_tree_view_multipress_pressed (GtkGestureMultiPress *gesture,
+                               gint                  n_press,
+                               gdouble               x,
+                               gdouble               y,
+                               GtkTreeView          *tree_view)
+{
+  GtkTreeViewColumn *column;
+  GtkTreePath *path;
+  gint bin_x, bin_y;
+
+  gtk_tree_view_convert_widget_to_bin_window_coords (tree_view, x, y,
+                                                     &bin_x, &bin_y);
+  gtk_tree_view_get_path_at_pos (tree_view, bin_x, bin_y,
+                                 &path, &column, NULL, NULL);
+
+  if (n_press == 2 || (n_press == 1 && tree_view->priv->activate_on_single_click))
+    gtk_tree_view_row_activated (tree_view, path, column);
+  else
+    {
+      if (n_press == 1)
+        {
+          tree_view->priv->button_pressed_node = tree_view->priv->prelight_node;
+          tree_view->priv->button_pressed_tree = tree_view->priv->prelight_tree;
+        }
+
+      grab_focus_and_unset_draw_keyfocus (tree_view);
+    }
+
+  gtk_tree_path_free (path);
+}
+
+static void
 gtk_tree_view_init (GtkTreeView *tree_view)
 {
   tree_view->priv = gtk_tree_view_get_instance_private (tree_view);
@@ -1802,6 +1840,14 @@ gtk_tree_view_init (GtkTreeView *tree_view)
 
   gtk_style_context_add_class (gtk_widget_get_style_context (GTK_WIDGET (tree_view)),
                                GTK_STYLE_CLASS_VIEW);
+
+  tree_view->priv->multipress_gesture = gtk_gesture_multi_press_new (GTK_WIDGET (tree_view));
+  gtk_gesture_single_set_touch_only (GTK_GESTURE_SINGLE (tree_view->priv->multipress_gesture), FALSE);
+  g_signal_connect (tree_view->priv->multipress_gesture, "pressed",
+                    G_CALLBACK (_tree_view_multipress_pressed), tree_view);
+  gtk_widget_add_gesture (GTK_WIDGET (tree_view),
+                          tree_view->priv->multipress_gesture,
+                          GTK_PHASE_BUBBLE);
 }
 
 
@@ -2992,7 +3038,6 @@ gtk_tree_view_button_press (GtkWidget      *widget,
       gint pre_val, aft_val;
       GtkTreeViewColumn *column = NULL;
       gint column_handled_click = FALSE;
-      gboolean row_double_click = FALSE;
       gboolean rtl;
       gboolean node_selected;
       GdkModifierType extend_mod_mask;
@@ -3242,67 +3287,6 @@ gtk_tree_view_button_press (GtkWidget      *widget,
            }
         }
 
-      if (event->button == GDK_BUTTON_PRIMARY && event->type == GDK_BUTTON_PRESS)
-        {
-
-          /* Test if a double click happened on the same row. */
-          if (!tree_view->priv->activate_on_single_click)
-            {
-              int double_click_time, double_click_distance;
-
-              g_object_get (gtk_settings_get_default (),
-                            "gtk-double-click-time", &double_click_time,
-                            "gtk-double-click-distance", &double_click_distance,
-                            NULL);
-
-              /* Same conditions as _gdk_event_button_generate */
-              if (tree_view->priv->last_button_x != -1 &&
-                  (event->time < tree_view->priv->last_button_time + double_click_time) &&
-                  (ABS (event->x - tree_view->priv->last_button_x) <= double_click_distance) &&
-                  (ABS (event->y - tree_view->priv->last_button_y) <= double_click_distance))
-                {
-                  /* We do no longer compare paths of this row and the
-                   * row clicked previously.  We use the double click
-                   * distance to decide whether this is a valid click,
-                   * allowing the mouse to slightly move over another row.
-                   */
-                  row_double_click = TRUE;
-
-                  tree_view->priv->last_button_time = 0;
-                  tree_view->priv->last_button_x = -1;
-                  tree_view->priv->last_button_y = -1;
-                }
-              else
-                {
-                  tree_view->priv->last_button_time = event->time;
-                  tree_view->priv->last_button_x = event->x;
-                  tree_view->priv->last_button_y = event->y;
-                }
-            }
-          else
-            {
-              tree_view->priv->button_pressed_node = tree_view->priv->prelight_node;
-              tree_view->priv->button_pressed_tree = tree_view->priv->prelight_tree;
-            }
-        }
-
-      if (row_double_click)
-       {
-         gtk_grab_remove (widget);
-         gtk_tree_view_row_activated (tree_view, path, column);
-
-          if (tree_view->priv->pressed_button == event->button)
-            tree_view->priv->pressed_button = -1;
-       }
-
-      gtk_tree_path_free (path);
-
-      /* If we activated the row through a double click we don't want to grab
-       * focus back, as moving focus to another widget is pretty common.
-       */
-      if (!row_double_click)
-       grab_focus_and_unset_draw_keyfocus (tree_view);
-
       return TRUE;
     }