[evince/wip/gpoo/gtk4-rebase-port: 60/72] ev-view: bring back keybinding for scroll and caret mode.




commit 532ae0ac0c800f856719ecf616db5e20e5749553
Author: Qiu Wenbo <qiuwenbo kylinos com cn>
Date:   Sun Aug 22 23:40:48 2021 +0800

    ev-view: bring back keybinding for scroll and caret mode.
    
    The order of the shortcuts callback being called is not guranteed. So we
    should guard the scroll handler from claiming the event. Also, we should
    make the scroll handler to return a boolean to claim the event and keep
    the parent window from calling the move focus callback.
    
    Signed-off-by: Qiu Wenbo <qiuwenbo kylinos com cn>

 libview/ev-view-marshal.list |   1 +
 libview/ev-view.c            | 242 +++++++++++++++++--------------------------
 2 files changed, 97 insertions(+), 146 deletions(-)
---
diff --git a/libview/ev-view-marshal.list b/libview/ev-view-marshal.list
index 63c6eddd7..feebf287b 100644
--- a/libview/ev-view-marshal.list
+++ b/libview/ev-view-marshal.list
@@ -2,3 +2,4 @@ VOID:ENUM,ENUM
 VOID:INT,INT
 VOID:POINTER,DOUBLE,DOUBLE
 BOOLEAN:ENUM,INT,BOOLEAN
+BOOLEAN:ENUM,ENUM
diff --git a/libview/ev-view.c b/libview/ev-view.c
index dae4070e3..8590cdb01 100644
--- a/libview/ev-view.c
+++ b/libview/ev-view.c
@@ -881,9 +881,8 @@ ev_view_set_scroll_adjustment (EvView         *view,
        g_object_notify (G_OBJECT (view), prop_name);
 }
 
-#if 0
 static void
-add_scroll_binding_keypad (GtkBindingSet  *binding_set,
+add_scroll_binding_keypad (GtkWidgetClass *widget_class,
                           guint           keyval,
                           GdkModifierType modifiers,
                           GtkScrollType   scroll,
@@ -891,16 +890,11 @@ add_scroll_binding_keypad (GtkBindingSet  *binding_set,
 {
        guint keypad_keyval = keyval - GDK_KEY_Left + GDK_KEY_KP_Left;
 
-       gtk_binding_entry_add_signal (binding_set, keyval, modifiers,
-                                     "scroll", 2,
-                                     GTK_TYPE_SCROLL_TYPE, scroll,
-                                     GTK_TYPE_ORIENTATION, orientation);
-       gtk_binding_entry_add_signal (binding_set, keypad_keyval, modifiers,
-                                     "scroll", 2,
-                                     GTK_TYPE_SCROLL_TYPE, scroll,
-                                     GTK_TYPE_ORIENTATION, orientation);
+       gtk_widget_class_add_binding_signal (widget_class, keyval, modifiers,
+                                     "scroll", "(ii)", scroll, orientation);
+       gtk_widget_class_add_binding_signal (widget_class, keypad_keyval, modifiers,
+                                     "scroll", "(ii)", scroll, orientation);
 }
-#endif
 
 static gdouble
 compute_scroll_increment (EvView        *view,
@@ -1024,7 +1018,7 @@ ev_view_scroll (EvView        *view,
        gboolean first_page = FALSE;
        gboolean last_page = FALSE;
 
-       if (view->key_binding_handled)
+       if (view->key_binding_handled || view->caret_enabled)
                return;
 
        view->jump_to_find_result = FALSE;
@@ -1133,6 +1127,9 @@ ev_view_scroll_internal (EvView        *view,
                         GtkScrollType  scroll,
                         GtkOrientation orientation)
 {
+       if (view->caret_enabled)
+               return;
+
        ev_view_scroll (view, scroll, orientation == GTK_ORIENTATION_HORIZONTAL);
 }
 
@@ -3941,7 +3938,7 @@ get_caret_cursor_area (EvView       *view,
        EvRectangle *areas = NULL;
        EvRectangle *doc_rect;
        guint        n_areas = 0;
-       gfloat       cursor_aspect_ratio;
+       gdouble      cursor_aspect_ratio;
        gint         stem_width;
 
        if (!view->caret_enabled || view->rotation != 0)
@@ -3981,11 +3978,11 @@ get_caret_cursor_area (EvView       *view,
        area->x -= view->scroll_x;
        area->y -= view->scroll_y;
 
-#if 0
-       gtk_style_context_get_style (gtk_widget_get_style_context (GTK_WIDGET (view)),
-                                    "cursor-aspect-ratio", &cursor_aspect_ratio,
-                                    NULL);
-#endif
+       g_object_get (gtk_settings_get_for_display (
+               gtk_style_context_get_display (gtk_widget_get_style_context (GTK_WIDGET (view)))),
+                "gtk-cursor-aspect-ratio", &cursor_aspect_ratio,
+                NULL);
+
        stem_width = area->height * cursor_aspect_ratio + 1;
        area->x -= (stem_width / 2);
        area->width = stem_width;
@@ -4052,9 +4049,8 @@ blink_cb (EvView *view)
                blink_time *= CURSOR_ON_MULTIPLIER;
        }
 
-#if 0
-       view->cursor_blink_timeout_id = gdk_threads_add_timeout (blink_time / CURSOR_DIVIDER, 
(GSourceFunc)blink_cb, view);
-#endif
+       view->cursor_blink_timeout_id = g_timeout_add (blink_time / CURSOR_DIVIDER, (GSourceFunc)blink_cb, 
view);
+
        return FALSE;
 }
 
@@ -4064,8 +4060,8 @@ ev_view_check_cursor_blink (EvView *view)
        if (cursor_should_blink (view)) {
                if (view->cursor_blink_timeout_id == 0) {
                        show_cursor (view);
-                       //view->cursor_blink_timeout_id = gdk_threads_add_timeout (get_cursor_blink_time 
(view) * CURSOR_ON_MULTIPLIER / CURSOR_DIVIDER,
-                       //                                                       (GSourceFunc)blink_cb, view);
+                       view->cursor_blink_timeout_id = g_timeout_add (get_cursor_blink_time (view) * 
CURSOR_ON_MULTIPLIER / CURSOR_DIVIDER,
+                                                                                (GSourceFunc)blink_cb, view);
                }
 
                return;
@@ -4090,8 +4086,8 @@ ev_view_pend_cursor_blink (EvView *view)
                g_source_remove (view->cursor_blink_timeout_id);
 
        show_cursor (view);
-       // view->cursor_blink_timeout_id = gdk_threads_add_timeout (get_cursor_blink_time (view) * 
CURSOR_PEND_MULTIPLIER / CURSOR_DIVIDER,
-       //                                                       (GSourceFunc)blink_cb, view);
+       view->cursor_blink_timeout_id = g_timeout_add (get_cursor_blink_time (view) * CURSOR_PEND_MULTIPLIER 
/ CURSOR_DIVIDER,
+                                                                (GSourceFunc)blink_cb, view);
 }
 
 static void
@@ -4598,28 +4594,9 @@ static void
 get_cursor_color (GtkStyleContext *context,
                  GdkRGBA         *color)
 {
-       GdkRGBA *caret_color;
-
-#if 0
-       gtk_style_context_get (context,
-                              gtk_style_context_get_state (context),
-                              "caret-color",
-                              &caret_color,
-                              NULL);
-
-       if (caret_color) {
-               color->red = caret_color->red;
-               color->green = caret_color->green;
-               color->blue = caret_color->blue;
-               color->alpha = caret_color->alpha;
-
-               gdk_rgba_free (caret_color);
-       } else {
-#endif
-               gtk_style_context_save (context);
-               gtk_style_context_get_color (context, color);
-               gtk_style_context_restore (context);
-       // }
+       gtk_style_context_save (context);
+       gtk_style_context_get_color (context, color);
+       gtk_style_context_restore (context);
 }
 
 /* This is based on the deprecated function gtk_draw_insertion_cursor. */
@@ -6707,7 +6684,6 @@ ev_view_move_cursor (EvView         *view,
        GdkRectangle    prev_rect;
        gint            prev_offset;
        gint            prev_page;
-       cairo_region_t *damage_region;
        gboolean        changed_page;
        gboolean        clear_selections = FALSE;
        const gboolean  forward = count >= 0;
@@ -6833,10 +6809,6 @@ ev_view_move_cursor (EvView         *view,
                view->cursor_line_offset = rect.x;
        }
 
-       damage_region = cairo_region_create_rectangle (&rect);
-       if (get_caret_cursor_area (view, prev_page, prev_offset, &prev_rect))
-               cairo_region_union_rectangle (damage_region, &prev_rect);
-
        rect.x += view->scroll_x;
        rect.y += view->scroll_y;
 
@@ -6847,8 +6819,6 @@ ev_view_move_cursor (EvView         *view,
 
        gtk_widget_queue_draw (GTK_WIDGET (view));
 
-       cairo_region_destroy (damage_region);
-
        /* Select text */
        if (extend_selections && EV_IS_SELECTION (view->document)) {
                GdkPoint start_point, end_point;
@@ -6892,6 +6862,7 @@ ev_view_key_press_event (GtkWidget   *widget,
        return retval;
 }
 
+
 static gboolean
 ev_view_activate_form_field (EvView      *view,
                             EvFormField *field)
@@ -7608,9 +7579,10 @@ pan_gesture_end_cb (GtkGesture       *gesture,
 
        view->pan_action = EV_PAN_ACTION_NONE;
 }
+#endif
 
 static void
-add_move_binding_keypad (GtkBindingSet  *binding_set,
+add_move_binding_keypad (GtkWidgetClass        *widget_class,
                         guint           keyval,
                         GdkModifierType modifiers,
                         GtkMovementStep step,
@@ -7618,30 +7590,22 @@ add_move_binding_keypad (GtkBindingSet  *binding_set,
 {
        guint keypad_keyval = keyval - GDK_KEY_Left + GDK_KEY_KP_Left;
 
-       gtk_binding_entry_add_signal (binding_set, keyval, modifiers,
-                                     "move-cursor", 3,
-                                     GTK_TYPE_MOVEMENT_STEP, step,
-                                     G_TYPE_INT, count,
-                                     G_TYPE_BOOLEAN, FALSE);
-       gtk_binding_entry_add_signal (binding_set, keypad_keyval, modifiers,
-                                     "move-cursor", 3,
-                                     GTK_TYPE_MOVEMENT_STEP, step,
-                                     G_TYPE_INT, count,
-                                     G_TYPE_BOOLEAN, FALSE);
+       gtk_widget_class_add_binding_signal (widget_class, keyval, modifiers,
+                                       "move-cursor", "(iib)",
+                                       step, count, FALSE);
+
+       gtk_widget_class_add_binding_signal (widget_class, keypad_keyval, modifiers,
+                                       "move-cursor", "(iib)",
+                                       step, count, FALSE);
 
        /* Selection-extending version */
-       gtk_binding_entry_add_signal (binding_set, keyval, modifiers | GDK_SHIFT_MASK,
-                                     "move-cursor", 3,
-                                     GTK_TYPE_MOVEMENT_STEP, step,
-                                     G_TYPE_INT, count,
-                                     G_TYPE_BOOLEAN, TRUE);
-       gtk_binding_entry_add_signal (binding_set, keypad_keyval, modifiers | GDK_SHIFT_MASK,
-                                     "move-cursor", 3,
-                                     GTK_TYPE_MOVEMENT_STEP, step,
-                                     G_TYPE_INT, count,
-                                     G_TYPE_BOOLEAN, TRUE);
+       gtk_widget_class_add_binding_signal (widget_class, keyval, modifiers | GDK_SHIFT_MASK,
+                                       "move-cursor", "(iib)",
+                                       step, count, TRUE);
+       gtk_widget_class_add_binding_signal (widget_class, keypad_keyval, modifiers | GDK_SHIFT_MASK,
+                                       "move-cursor", "(iib)",
+                                       step, count, TRUE);
 }
-#endif
 
 static gint
 ev_view_mapping_compare (const EvMapping *a,
@@ -7886,8 +7850,8 @@ ev_view_class_init (EvViewClass *class)
                         G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
                         G_STRUCT_OFFSET (EvViewClass, scroll),
                         NULL, NULL,
-                        ev_view_marshal_VOID__ENUM_ENUM,
-                        G_TYPE_NONE, 2,
+                        ev_view_marshal_BOOLEAN__ENUM_ENUM,
+                        G_TYPE_BOOLEAN, 2,
                         GTK_TYPE_SCROLL_TYPE,
                         GTK_TYPE_ORIENTATION);
        signals[SIGNAL_HANDLE_LINK] = g_signal_new ("handle-link",
@@ -8003,78 +7967,64 @@ ev_view_class_init (EvViewClass *class)
 
        // widget_class->activate_signal = signals[SIGNAL_ACTIVATE];
 
-#if 0
-       binding_set = gtk_binding_set_by_class (class);
-
-       add_move_binding_keypad (binding_set, GDK_KEY_Left,  0, GTK_MOVEMENT_VISUAL_POSITIONS, -1);
-       add_move_binding_keypad (binding_set, GDK_KEY_Right, 0, GTK_MOVEMENT_VISUAL_POSITIONS, 1);
-       add_move_binding_keypad (binding_set, GDK_KEY_Left,  GDK_CONTROL_MASK, GTK_MOVEMENT_WORDS, -1);
-       add_move_binding_keypad (binding_set, GDK_KEY_Right, GDK_CONTROL_MASK, GTK_MOVEMENT_WORDS, 1);
-       add_move_binding_keypad (binding_set, GDK_KEY_Up,    0, GTK_MOVEMENT_DISPLAY_LINES, -1);
-       add_move_binding_keypad (binding_set, GDK_KEY_Down,  0, GTK_MOVEMENT_DISPLAY_LINES, 1);
-       add_move_binding_keypad (binding_set, GDK_KEY_Home,  0, GTK_MOVEMENT_DISPLAY_LINE_ENDS, -1);
-       add_move_binding_keypad (binding_set, GDK_KEY_End,   0, GTK_MOVEMENT_DISPLAY_LINE_ENDS, 1);
-       add_move_binding_keypad (binding_set, GDK_KEY_Home,  GDK_CONTROL_MASK, GTK_MOVEMENT_BUFFER_ENDS, -1);
-       add_move_binding_keypad (binding_set, GDK_KEY_End,   GDK_CONTROL_MASK, GTK_MOVEMENT_BUFFER_ENDS, 1);
-
-        add_scroll_binding_keypad (binding_set, GDK_KEY_Left,  0, GTK_SCROLL_STEP_BACKWARD, 
GTK_ORIENTATION_HORIZONTAL);
-        add_scroll_binding_keypad (binding_set, GDK_KEY_Right, 0, GTK_SCROLL_STEP_FORWARD, 
GTK_ORIENTATION_HORIZONTAL);
-        add_scroll_binding_keypad (binding_set, GDK_KEY_Left,  GDK_MOD1_MASK, GTK_SCROLL_STEP_DOWN, 
GTK_ORIENTATION_HORIZONTAL);
-        add_scroll_binding_keypad (binding_set, GDK_KEY_Right, GDK_MOD1_MASK, GTK_SCROLL_STEP_UP, 
GTK_ORIENTATION_HORIZONTAL);
-        add_scroll_binding_keypad (binding_set, GDK_KEY_Up,    0, GTK_SCROLL_STEP_BACKWARD, 
GTK_ORIENTATION_VERTICAL);
-        add_scroll_binding_keypad (binding_set, GDK_KEY_Down,  0, GTK_SCROLL_STEP_FORWARD, 
GTK_ORIENTATION_VERTICAL);
-        add_scroll_binding_keypad (binding_set, GDK_KEY_Up,    GDK_MOD1_MASK, GTK_SCROLL_STEP_DOWN, 
GTK_ORIENTATION_VERTICAL);
-        add_scroll_binding_keypad (binding_set, GDK_KEY_Down,  GDK_MOD1_MASK, GTK_SCROLL_STEP_UP, 
GTK_ORIENTATION_VERTICAL);
-       add_scroll_binding_keypad (binding_set, GDK_KEY_Page_Up, 0, GTK_SCROLL_PAGE_BACKWARD, 
GTK_ORIENTATION_VERTICAL);
-       add_scroll_binding_keypad (binding_set, GDK_KEY_Page_Down, 0, GTK_SCROLL_PAGE_FORWARD, 
GTK_ORIENTATION_VERTICAL);
-       add_scroll_binding_keypad (binding_set, GDK_KEY_Home, GDK_CONTROL_MASK, GTK_SCROLL_START, 
GTK_ORIENTATION_VERTICAL);
-       add_scroll_binding_keypad (binding_set, GDK_KEY_End, GDK_CONTROL_MASK, GTK_SCROLL_END, 
GTK_ORIENTATION_VERTICAL);
+       add_move_binding_keypad (widget_class, GDK_KEY_Left,  0, GTK_MOVEMENT_VISUAL_POSITIONS, -1);
+       add_move_binding_keypad (widget_class, GDK_KEY_Right, 0, GTK_MOVEMENT_VISUAL_POSITIONS, 1);
+       add_move_binding_keypad (widget_class, GDK_KEY_Left,  GDK_CONTROL_MASK, GTK_MOVEMENT_WORDS, -1);
+       add_move_binding_keypad (widget_class, GDK_KEY_Right, GDK_CONTROL_MASK, GTK_MOVEMENT_WORDS, 1);
+       add_move_binding_keypad (widget_class, GDK_KEY_Up,    0, GTK_MOVEMENT_DISPLAY_LINES, -1);
+       add_move_binding_keypad (widget_class, GDK_KEY_Down,  0, GTK_MOVEMENT_DISPLAY_LINES, 1);
+       add_move_binding_keypad (widget_class, GDK_KEY_Home,  0, GTK_MOVEMENT_DISPLAY_LINE_ENDS, -1);
+       add_move_binding_keypad (widget_class, GDK_KEY_End,   0, GTK_MOVEMENT_DISPLAY_LINE_ENDS, 1);
+       add_move_binding_keypad (widget_class, GDK_KEY_Home,  GDK_CONTROL_MASK, GTK_MOVEMENT_BUFFER_ENDS, -1);
+       add_move_binding_keypad (widget_class, GDK_KEY_End,   GDK_CONTROL_MASK, GTK_MOVEMENT_BUFFER_ENDS, 1);
+
+        add_scroll_binding_keypad (widget_class, GDK_KEY_Left,  0, GTK_SCROLL_STEP_BACKWARD, 
GTK_ORIENTATION_HORIZONTAL);
+        add_scroll_binding_keypad (widget_class, GDK_KEY_Right, 0, GTK_SCROLL_STEP_FORWARD, 
GTK_ORIENTATION_HORIZONTAL);
+        add_scroll_binding_keypad (widget_class, GDK_KEY_Left,  GDK_ALT_MASK, GTK_SCROLL_STEP_DOWN, 
GTK_ORIENTATION_HORIZONTAL);
+        add_scroll_binding_keypad (widget_class, GDK_KEY_Right, GDK_ALT_MASK, GTK_SCROLL_STEP_UP, 
GTK_ORIENTATION_HORIZONTAL);
+        add_scroll_binding_keypad (widget_class, GDK_KEY_Up,    0, GTK_SCROLL_STEP_BACKWARD, 
GTK_ORIENTATION_VERTICAL);
+        add_scroll_binding_keypad (widget_class, GDK_KEY_Down,  0, GTK_SCROLL_STEP_FORWARD, 
GTK_ORIENTATION_VERTICAL);
+        add_scroll_binding_keypad (widget_class, GDK_KEY_Up,    GDK_ALT_MASK, GTK_SCROLL_STEP_DOWN, 
GTK_ORIENTATION_VERTICAL);
+        add_scroll_binding_keypad (widget_class, GDK_KEY_Down,  GDK_ALT_MASK, GTK_SCROLL_STEP_UP, 
GTK_ORIENTATION_VERTICAL);
+       add_scroll_binding_keypad (widget_class, GDK_KEY_Page_Up, 0, GTK_SCROLL_PAGE_BACKWARD, 
GTK_ORIENTATION_VERTICAL);
+       add_scroll_binding_keypad (widget_class, GDK_KEY_Page_Down, 0, GTK_SCROLL_PAGE_FORWARD, 
GTK_ORIENTATION_VERTICAL);
+       add_scroll_binding_keypad (widget_class, GDK_KEY_Home, GDK_CONTROL_MASK, GTK_SCROLL_START, 
GTK_ORIENTATION_VERTICAL);
+       add_scroll_binding_keypad (widget_class, GDK_KEY_End, GDK_CONTROL_MASK, GTK_SCROLL_END, 
GTK_ORIENTATION_VERTICAL);
 
        /* We can't use the bindings defined in GtkWindow for Space and Return,
         * because we also have those bindings for scrolling.
         */
-       gtk_binding_entry_add_signal (binding_set, GDK_KEY_space, 0,
-                                     "activate", 0);
-       gtk_binding_entry_add_signal (binding_set, GDK_KEY_KP_Space, 0,
-                                     "activate", 0);
-       gtk_binding_entry_add_signal (binding_set, GDK_KEY_Return, 0,
-                                     "activate", 0);
-       gtk_binding_entry_add_signal (binding_set, GDK_KEY_ISO_Enter, 0,
-                                     "activate", 0);
-       gtk_binding_entry_add_signal (binding_set, GDK_KEY_KP_Enter, 0,
-                                     "activate", 0);
-
-       gtk_binding_entry_add_signal (binding_set, GDK_KEY_Return, 0, "scroll", 2,
-                                     GTK_TYPE_SCROLL_TYPE, GTK_SCROLL_PAGE_FORWARD,
-                                     GTK_TYPE_ORIENTATION, GTK_ORIENTATION_VERTICAL);
-       gtk_binding_entry_add_signal (binding_set, GDK_KEY_Return, GDK_SHIFT_MASK, "scroll", 2,
-                                     GTK_TYPE_SCROLL_TYPE, GTK_SCROLL_PAGE_BACKWARD,
-                                     GTK_TYPE_ORIENTATION, GTK_ORIENTATION_VERTICAL);
-        gtk_binding_entry_add_signal (binding_set, GDK_KEY_H, 0, "scroll", 2,
-                                     GTK_TYPE_SCROLL_TYPE, GTK_SCROLL_STEP_BACKWARD,
-                                     GTK_TYPE_ORIENTATION, GTK_ORIENTATION_HORIZONTAL);
-       gtk_binding_entry_add_signal (binding_set, GDK_KEY_J, 0, "scroll", 2,
-                                     GTK_TYPE_SCROLL_TYPE, GTK_SCROLL_STEP_FORWARD,
-                                     GTK_TYPE_ORIENTATION, GTK_ORIENTATION_VERTICAL);
-       gtk_binding_entry_add_signal (binding_set, GDK_KEY_K, 0, "scroll", 2,
-                                     GTK_TYPE_SCROLL_TYPE, GTK_SCROLL_STEP_BACKWARD,
-                                     GTK_TYPE_ORIENTATION, GTK_ORIENTATION_VERTICAL);
-       gtk_binding_entry_add_signal (binding_set, GDK_KEY_L, 0, "scroll", 2,
-                                     GTK_TYPE_SCROLL_TYPE, GTK_SCROLL_STEP_FORWARD,
-                                     GTK_TYPE_ORIENTATION, GTK_ORIENTATION_HORIZONTAL);
-       gtk_binding_entry_add_signal (binding_set, GDK_KEY_space, 0, "scroll", 2,
-                                     GTK_TYPE_SCROLL_TYPE, GTK_SCROLL_PAGE_FORWARD,
-                                     GTK_TYPE_ORIENTATION, GTK_ORIENTATION_VERTICAL);
-       gtk_binding_entry_add_signal (binding_set, GDK_KEY_space, GDK_SHIFT_MASK, "scroll", 2,
-                                     GTK_TYPE_SCROLL_TYPE, GTK_SCROLL_PAGE_BACKWARD,
-                                     GTK_TYPE_ORIENTATION, GTK_ORIENTATION_VERTICAL);
-       gtk_binding_entry_add_signal (binding_set, GDK_KEY_BackSpace, 0, "scroll", 2,
-                                     GTK_TYPE_SCROLL_TYPE, GTK_SCROLL_PAGE_BACKWARD,
-                                     GTK_TYPE_ORIENTATION, GTK_ORIENTATION_VERTICAL);
-       gtk_binding_entry_add_signal (binding_set, GDK_KEY_BackSpace, GDK_SHIFT_MASK, "scroll", 2,
-                                     GTK_TYPE_SCROLL_TYPE, GTK_SCROLL_PAGE_FORWARD,
-                                     GTK_TYPE_ORIENTATION, GTK_ORIENTATION_VERTICAL);
-#endif
+       gtk_widget_class_add_binding_signal (widget_class, GDK_KEY_space, 0,
+                                     "activate", NULL);
+       gtk_widget_class_add_binding_signal (widget_class, GDK_KEY_KP_Space, 0,
+                                     "activate", NULL);
+       gtk_widget_class_add_binding_signal (widget_class, GDK_KEY_Return, 0,
+                                     "activate", NULL);
+       gtk_widget_class_add_binding_signal (widget_class, GDK_KEY_ISO_Enter, 0,
+                                     "activate", NULL);
+       gtk_widget_class_add_binding_signal (widget_class, GDK_KEY_KP_Enter, 0,
+                                     "activate", NULL);
+
+       gtk_widget_class_add_binding_signal (widget_class, GDK_KEY_Return, 0, "scroll",
+                                     "(ii)", GTK_SCROLL_PAGE_FORWARD, GTK_ORIENTATION_VERTICAL);
+       gtk_widget_class_add_binding_signal (widget_class, GDK_KEY_Return, GDK_SHIFT_MASK, "scroll",
+                                     "(ii)", GTK_SCROLL_PAGE_BACKWARD, GTK_ORIENTATION_VERTICAL);
+       gtk_widget_class_add_binding_signal (widget_class, GDK_KEY_H, 0, "scroll",
+                                     "(ii)", GTK_SCROLL_STEP_BACKWARD, GTK_ORIENTATION_HORIZONTAL);
+       gtk_widget_class_add_binding_signal (widget_class, GDK_KEY_J, 0, "scroll",
+                                     "(ii)", GTK_SCROLL_STEP_FORWARD, GTK_ORIENTATION_VERTICAL);
+       gtk_widget_class_add_binding_signal (widget_class, GDK_KEY_K, 0, "scroll",
+                                     "(ii)", GTK_SCROLL_STEP_BACKWARD, GTK_ORIENTATION_VERTICAL);
+       gtk_widget_class_add_binding_signal (widget_class, GDK_KEY_L, 0, "scroll",
+                                     "(ii)", GTK_SCROLL_STEP_FORWARD, GTK_ORIENTATION_HORIZONTAL);
+       gtk_widget_class_add_binding_signal (widget_class, GDK_KEY_space, 0, "scroll",
+                                     "(ii)", GTK_SCROLL_PAGE_FORWARD, GTK_ORIENTATION_VERTICAL);
+       gtk_widget_class_add_binding_signal (widget_class, GDK_KEY_space, GDK_SHIFT_MASK, "scroll",
+                                     "(ii)", GTK_SCROLL_PAGE_BACKWARD, GTK_ORIENTATION_VERTICAL);
+       gtk_widget_class_add_binding_signal (widget_class, GDK_KEY_BackSpace, 0, "scroll",
+                                     "(ii)", GTK_SCROLL_PAGE_BACKWARD, GTK_ORIENTATION_VERTICAL);
+       gtk_widget_class_add_binding_signal (widget_class, GDK_KEY_BackSpace, GDK_SHIFT_MASK, "scroll",
+                                     "(ii)",  GTK_SCROLL_PAGE_FORWARD, GTK_ORIENTATION_VERTICAL);
 }
 
 static void


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