[evince] Bind mouse back/forward buttons to history navigation.

[Carlos Garcia Campos <carlosgc src gnome org>]

commit 1ff42625f28246d790694625065c2476aaf03f19
Author: Casey Jao <casey jao gmail com>
Date:   Fri Sep 8 19:53:50 2017 -0700

    Bind mouse back/forward buttons to history navigation.
    
    shell/ev-window.c:
    *Listen for mouse back/forward button presses.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=787464

 shell/ev-window.c |   24 ++++++++++++++++++++++++
 1 files changed, 24 insertions(+), 0 deletions(-)
---
diff --git a/shell/ev-window.c b/shell/ev-window.c
index 0edab3a..0fe49ba 100644
--- a/shell/ev-window.c
+++ b/shell/ev-window.c
@@ -100,6 +100,9 @@
 #include <X11/extensions/XInput2.h>
 #endif
 
+#define MOUSE_BACK_BUTTON 8
+#define MOUSE_FORWARD_BUTTON 9
+
 typedef enum {
        PAGE_MODE_DOCUMENT,
        PAGE_MODE_PASSWORD
@@ -5641,6 +5644,26 @@ ev_window_key_press_event (GtkWidget   *widget,
 }
 
 static gboolean
+ev_window_button_press_event (GtkWidget      *widget,
+                              GdkEventButton *event)
+{
+        EvWindow *window = EV_WINDOW (widget);
+
+        switch (event->button) {
+        case MOUSE_BACK_BUTTON:
+                ev_history_go_back (window->priv->history);
+                return TRUE;
+        case MOUSE_FORWARD_BUTTON:
+                ev_history_go_forward (window->priv->history);
+                return TRUE;
+        default:
+                break;
+        }
+
+        return FALSE;
+}
+
+static gboolean
 ev_window_delete_event (GtkWidget   *widget,
                        GdkEventAny *event)
 {
@@ -5659,6 +5682,7 @@ ev_window_class_init (EvWindowClass *ev_window_class)
        widget_class->key_press_event = ev_window_key_press_event;
        widget_class->window_state_event = ev_window_state_event;
        widget_class->drag_data_received = ev_window_drag_data_received;
+       widget_class->button_press_event = ev_window_button_press_event;
 
        nautilus_sendto = g_find_program_in_path ("nautilus-sendto");