[virt-tools-list] [PATCH virt-viewer v3] window: Allow to control zoom using keypad

[Pavel Grunt]

Support for more than one key combo for accelerator is available
since GTK 3.12 through GAction. It is currently not possible to
use mnemonics also for numpad keys, for more info see:
 https://bugzilla.gnome.org/show_bug.cgi?id=699823

Resolves: rhbz#1337575
---
v3:
use a designated initializer to initialize a structure to avoid gcc warnings
---
 configure.ac             |  4 ++--
 src/virt-viewer-window.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 58 insertions(+), 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index 69e3708..d5eb258 100644
--- a/configure.ac
+++ b/configure.ac
@@ -17,8 +17,8 @@ GLIB2_REQUIRED="2.38"
 GLIB2_ENCODED_VERSION="GLIB_VERSION_2_38"
 
 # Keep these two definitions in agreement.
-GTK_REQUIRED="3.10"
-GTK_ENCODED_VERSION="GDK_VERSION_3_10"
+GTK_REQUIRED="3.12"
+GTK_ENCODED_VERSION="GDK_VERSION_3_12"
 
 LIBXML2_REQUIRED="2.6.0"
 LIBVIRT_REQUIRED="0.10.0"
diff --git a/src/virt-viewer-window.c b/src/virt-viewer-window.c
index 867a7b0..f5448c6 100644
--- a/src/virt-viewer-window.c
+++ b/src/virt-viewer-window.c
@@ -693,6 +693,45 @@ virt_viewer_window_get_keycombo_menu(VirtViewerWindow *self)
     return menu;
 }
 
+static void
+action_zoom_in(G_GNUC_UNUSED GSimpleAction *action,
+               G_GNUC_UNUSED GVariant *state,
+               gpointer user_data)
+{
+    virt_viewer_window_menu_view_zoom_in(NULL, VIRT_VIEWER_WINDOW(user_data));
+}
+
+static void
+action_zoom_out(G_GNUC_UNUSED GSimpleAction *action,
+                G_GNUC_UNUSED GVariant *state,
+                gpointer user_data)
+{
+    virt_viewer_window_menu_view_zoom_out(NULL, VIRT_VIEWER_WINDOW(user_data));
+}
+
+static void
+action_zoom_reset(G_GNUC_UNUSED GSimpleAction *action,
+                  G_GNUC_UNUSED GVariant *state,
+                  gpointer user_data)
+{
+    virt_viewer_window_menu_view_zoom_reset(NULL, VIRT_VIEWER_WINDOW(user_data));
+}
+
+/* Keep keypad_action_entries and keypad_action_accels in sync */
+static const GActionEntry keypad_action_entries[] = {
+    { .name = "zoom-in", .activate = action_zoom_in },
+    { .name = "zoom-out", .activate = action_zoom_out },
+    { .name = "zoom-reset", .activate = action_zoom_reset },
+};
+
+static const gchar *const keypad_action_accels[][2] = {
+    /* numpad keys are not handled automatically by gtk, see bgo#699823 */
+    {"<control>KP_Add", NULL},
+    {"<control>KP_Subtract", NULL},
+    {"<control>KP_0", NULL},
+};
+G_STATIC_ASSERT(G_N_ELEMENTS(keypad_action_entries) == G_N_ELEMENTS(keypad_action_accels));
+
 void
 virt_viewer_window_disable_modifiers(VirtViewerWindow *self)
 {
@@ -700,6 +739,7 @@ virt_viewer_window_disable_modifiers(VirtViewerWindow *self)
     VirtViewerWindowPrivate *priv = self->priv;
     GValue empty;
     GSList *accels;
+    guint i;
 
     if (!priv->accel_enabled)
         return;
@@ -726,6 +766,10 @@ virt_viewer_window_disable_modifiers(VirtViewerWindow *self)
                  "gtk-enable-mnemonics", FALSE,
                  NULL);
 
+    for (i = 0; i < G_N_ELEMENTS(keypad_action_entries); i++) {
+        g_action_map_remove_action(G_ACTION_MAP(priv->window), keypad_action_entries[i].name);
+    }
+
     priv->accel_enabled = FALSE;
 }
 
@@ -735,6 +779,7 @@ virt_viewer_window_enable_modifiers(VirtViewerWindow *self)
     GtkSettings *settings = gtk_settings_get_default();
     VirtViewerWindowPrivate *priv = self->priv;
     GSList *accels;
+    guint i;
 
     if (priv->accel_enabled)
         return;
@@ -755,6 +800,17 @@ virt_viewer_window_enable_modifiers(VirtViewerWindow *self)
                  "gtk-enable-mnemonics", priv->enable_mnemonics_save,
                  NULL);
 
+    g_action_map_add_action_entries(G_ACTION_MAP(priv->window),
+                                    keypad_action_entries, G_N_ELEMENTS(keypad_action_entries),
+                                    self);
+    for (i = 0; i < G_N_ELEMENTS(keypad_action_entries); i++) {
+        gchar *detailed_name = g_strdup_printf("win.%s", keypad_action_entries[i].name);
+        gtk_application_set_accels_for_action(GTK_APPLICATION(priv->app),
+                                              detailed_name,
+                                              keypad_action_accels[i]);
+        g_free(detailed_name);
+    }
+
     priv->accel_enabled = TRUE;
 }
 
-- 
2.12.2