shell/ev-navigation-action-widget.c

   1 /*
   2  *  Copyright (C) 2003, 2004 Marco Pesenti Gritti
   3  *  Copyright (C) 2003, 2004 Christian Persch
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2, or (at your option)
   8  *  any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  */
  19
  20 #include "config.h"
  21 #include "ev-navigation-action-widget.h"
  22
  23 #include <glib/gi18n.h>
  24 #include <string.h>
  25
  26 static void  ev_navigation_action_widget_init       (EvNavigationActionWidget      *action_widget);
  27 static void  ev_navigation_action_widget_class_init (EvNavigationActionWidgetClass *action_widget);
  28 static void ev_navigation_action_widget_toggled (GtkToggleToolButton *toggle);
  29 static gboolean ev_navigation_action_widget_button_press_event (GtkWidget *widget,
  30                                                                 GdkEventButton    *event,
  31                                                                 gpointer data);
  32
  33 G_DEFINE_TYPE (EvNavigationActionWidget, ev_navigation_action_widget, GTK_TYPE_TOGGLE_TOOL_BUTTON)
  34
  35 enum
  36 {
  37         SHOW_MENU,
  38         LAST_SIGNAL
  39 };
  40
  41 static gint signals[LAST_SIGNAL];
  42
  43 static void
  44 ev_navigation_action_widget_init (EvNavigationActionWidget *action_widget)
  45 {
  46         GtkWidget *toggle_button;
  47
  48         /* It's rather dirty hack but we need a child to connect to
  49          * button press event
  50          */
  51
  52         toggle_button = gtk_bin_get_child (GTK_BIN (action_widget));
  53
  54         g_signal_connect (toggle_button, "button-press-event",
  55                           G_CALLBACK (ev_navigation_action_widget_button_press_event),
  56                           action_widget);
  57         return;
  58 }
  59
  60 static void
  61 ev_navigation_action_widget_class_init (EvNavigationActionWidgetClass *klass)
  62 {
  63         GtkToggleToolButtonClass *toggle_tool_button_class = GTK_TOGGLE_TOOL_BUTTON_CLASS (klass);
  64
  65         toggle_tool_button_class->toggled = ev_navigation_action_widget_toggled;
  66
  67         signals[SHOW_MENU] =
  68                   g_signal_new ("show-menu",
  69                                 G_OBJECT_CLASS_TYPE (klass),
  70                                 G_SIGNAL_RUN_FIRST,
  71                                 G_STRUCT_OFFSET (EvNavigationActionWidgetClass, show_menu),
  72                                 NULL, NULL,
  73                                 g_cclosure_marshal_VOID__VOID,
  74                                 G_TYPE_NONE, 0);
  75 }
  76
  77 static int
  78 menu_deactivate_cb (GtkMenuShell      *menu_shell,
  79                     EvNavigationActionWidget *widget)
  80 {
  81          gtk_toggle_tool_button_set_active (GTK_TOGGLE_TOOL_BUTTON (widget), FALSE);
  82          return TRUE;
  83 }
  84
  85 static void
  86 menu_detacher (GtkWidget *widget,
  87                GtkMenu   *menu)
  88 {
  89          EvNavigationActionWidget *button = EV_NAVIGATION_ACTION_WIDGET (widget);
  90          g_return_if_fail (button->menu == menu);
  91          button->menu = NULL;
  92 }
  93
  94 void
  95 ev_navigation_action_widget_set_menu(EvNavigationActionWidget *button, GtkWidget *menu)
  96 {
  97
  98       if (button->menu == GTK_MENU (menu))
  99                 return;
 100
 101       if (button->menu && gtk_widget_get_visible (GTK_WIDGET (button->menu)))
 102                 gtk_menu_shell_deactivate (GTK_MENU_SHELL (button->menu));
 103
 104       if (button->menu) {
 105                 g_signal_handlers_disconnect_by_func (button->menu,
 106                                                 menu_deactivate_cb,
 107                                                 button);
 108                 gtk_menu_detach (button->menu);
 109        }
 110
 111        button->menu = GTK_MENU (menu);
 112
 113        if (button->menu) {
 114                 gtk_menu_attach_to_widget (button->menu, GTK_WIDGET (button),
 115                                            menu_detacher);
 116                 g_signal_connect (button->menu, "deactivate",
 117                                   G_CALLBACK (menu_deactivate_cb), button);
 118         }
 119 }
 120
 121 static void
 122 menu_position_func (GtkMenu           *menu,
 123                     int               *x,
 124                     int               *y,
 125                     gboolean          *push_in,
 126                     EvNavigationActionWidget *button)
 127 {
 128         GtkWidget *widget = GTK_WIDGET (button);
 129         GtkRequisition menu_req;
 130         GtkAllocation  allocation;
 131         GtkTextDirection direction;
 132         GdkWindow *gdk_window;
 133         GdkRectangle monitor;
 134         gint monitor_num;
 135         GdkScreen *screen;
 136
 137         gtk_widget_get_preferred_size (GTK_WIDGET (button->menu), &menu_req, NULL);
 138         direction = gtk_widget_get_direction (widget);
 139         screen = gtk_widget_get_screen (GTK_WIDGET (menu));
 140
 141         gdk_window = gtk_widget_get_window (widget);
 142         monitor_num = gdk_screen_get_monitor_at_window (screen, gdk_window);
 143         if (monitor_num < 0)
 144                 monitor_num = 0;
 145         gdk_screen_get_monitor_geometry (screen, monitor_num, &monitor);
 146
 147         gdk_window_get_origin (gdk_window, x, y);
 148         gtk_widget_get_allocation (widget, &allocation);
 149         *x += allocation.x;
 150         *y += allocation.y;
 151
 152         if (direction == GTK_TEXT_DIR_LTR)
 153                 *x += MAX (allocation.width - menu_req.width, 0);
 154         else if (menu_req.width > allocation.width)
 155                 *x -= menu_req.width - allocation.width;
 156
 157         if ((*y + allocation.height + menu_req.height) <= monitor.y + monitor.height)
 158                 *y += allocation.height;
 159         else if ((*y - menu_req.height) >= monitor.y)
 160                 *y -= menu_req.height;
 161         else if (monitor.y + monitor.height - (*y + allocation.height) > *y)
 162                 *y += allocation.height;
 163         else
 164                 *y -= menu_req.height;
 165
 166         *push_in = FALSE;
 167 }
 168
 169 static void
 170 popup_menu_under_arrow (EvNavigationActionWidget *button,
 171                         GdkEventButton    *event)
 172 {
 173         g_signal_emit (button, signals[SHOW_MENU], 0);
 174
 175         if (!button->menu)
 176                 return;
 177
 178         gtk_menu_popup (button->menu, NULL, NULL,
 179                         (GtkMenuPositionFunc) menu_position_func,
 180                          button,
 181                          event ? event->button : 0,
 182                          event ? event->time : gtk_get_current_event_time ());
 183 }
 184
 185 static void
 186 ev_navigation_action_widget_toggled (GtkToggleToolButton *toggle)
 187 {
 188         EvNavigationActionWidget *button = EV_NAVIGATION_ACTION_WIDGET (toggle);
 189         if (!button->menu)
 190                 return;
 191
 192         if (gtk_toggle_tool_button_get_active (GTK_TOGGLE_TOOL_BUTTON (button)) &&
 193             !gtk_widget_get_visible (GTK_WIDGET (button->menu))) {
 194                       /* we get here only when the menu is activated by a key
 195                        * press, so that we can select the first menu item */
 196                       popup_menu_under_arrow (button, NULL);
 197                       gtk_menu_shell_select_first (GTK_MENU_SHELL (button->menu), FALSE);
 198         }
 199 }
 200
 201 static gboolean
 202 ev_navigation_action_widget_button_press_event (GtkWidget *widget,
 203                                                 GdkEventButton    *event,
 204                                                 gpointer data)
 205 {
 206         EvNavigationActionWidget *button = EV_NAVIGATION_ACTION_WIDGET (data);
 207
 208         if (event->button == 1) {
 209                  popup_menu_under_arrow (button, event);
 210                  gtk_toggle_tool_button_set_active (GTK_TOGGLE_TOOL_BUTTON (button), TRUE);
 211                  return TRUE;
 212         }
 213         return FALSE;
 214 }