[nautilus-actions] Add a preview when selecting an icon

[Pierre Wieser <pwieser src gnome org>]

commit 4795ab2c20b38df00e4e45b6661a3281bd007e53
Author: Pierre Wieser <pwieser trychlos org>
Date:   Thu Dec 2 20:37:57 2010 +0100

    Add a preview when selecting an icon

 ChangeLog                   |    7 +++++++
 src/nact/nact-gtk-utils.c   |   39 +++++++++++++++++++++++++++++++++++++++
 src/nact/nact-gtk-utils.h   |    6 ++++++
 src/nact/nact-iaction-tab.c |   25 +++++++++++++++++++++++--
 4 files changed, 75 insertions(+), 2 deletions(-)
---
diff --git a/ChangeLog b/ChangeLog
index 6c6ccda..fe1bc88 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,12 @@
 2010-12-02 Pierre Wieser <pwieser trychlos org>
 
+	* src/nact/nact-gtk-utils.c:
+	* src/nact/nact-gtk-utils.h (nact_gtk_utils_select_file_with_preview):
+	New function.
+
+	* src/nact/nact-iaction-tab.c (on_icon_browse):
+	Add a preview when selecting an icon.
+
 	Factorize help description.
 
 	* po/POTFILES.in: add src/utils/console-utils.c file.
diff --git a/src/nact/nact-gtk-utils.c b/src/nact/nact-gtk-utils.c
index 996dd7f..1c0ab1b 100644
--- a/src/nact/nact-gtk-utils.c
+++ b/src/nact/nact-gtk-utils.c
@@ -268,12 +268,45 @@ nact_gtk_utils_select_file( BaseWindow *window,
 				GtkWidget *entry, const gchar *entry_name,
 				const gchar *default_dir_uri )
 {
+	nact_gtk_utils_select_file_with_preview(
+			window, title, dialog_name, entry, entry_name, default_dir_uri, NULL );
+}
+
+/**
+ * nact_gtk_utils_select_file_with_preview:
+ * @window: the #BaseWindow which will be the parent of the dialog box.
+ * @title: the title of the dialog box.
+ * @dialog_name: the name of the dialog box in Preferences to read/write
+ *  its size and position.
+ * @entry: the #GtkEntry which is associated with the selected file.
+ * @entry_name: the name of the entry in Preferences to be readen/written.
+ * @default_dir_uri: the URI of the directory which should be set if there is
+ *  not yet any preference (see @entry_name)
+ * @update_preview_cb: the callback function in charge of updating the
+ *  preview widget. May be NULL.
+ *
+ * Opens a #GtkFileChooserDialog and let the user choose an existing file
+ * -> choose and display an existing file name
+ * -> record the dirname URI.
+ *
+ * If the user validates its selection, the choosen file pathname will be
+ * written in the @entry #GtkEntry, while the corresponding dirname
+ * URI will be written as @entry_name in Preferences.
+ */
+void
+nact_gtk_utils_select_file_with_preview( BaseWindow *window,
+				const gchar *title, const gchar *dialog_name,
+				GtkWidget *entry, const gchar *entry_name,
+				const gchar *default_dir_uri,
+				GCallback update_preview_cb )
+{
 	NactApplication *application;
 	NAUpdater *updater;
 	GtkWindow *toplevel;
 	GtkWidget *dialog;
 	const gchar *text;
 	gchar *filename, *uri;
+	GtkWidget *preview;
 
 	application = NACT_APPLICATION( base_window_get_application( window ));
 	updater = nact_application_get_updater( application );
@@ -288,6 +321,12 @@ nact_gtk_utils_select_file( BaseWindow *window,
 			NULL
 			);
 
+	if( update_preview_cb ){
+		preview = gtk_image_new();
+		gtk_file_chooser_set_preview_widget( GTK_FILE_CHOOSER( dialog ), preview );
+		g_signal_connect( dialog, "update-preview", update_preview_cb, preview );
+	}
+
 	base_iprefs_position_named_window( window, GTK_WINDOW( dialog ), dialog_name );
 
 	text = gtk_entry_get_text( GTK_ENTRY( entry ));
diff --git a/src/nact/nact-gtk-utils.h b/src/nact/nact-gtk-utils.h
index 3c5c995..8414f29 100644
--- a/src/nact/nact-gtk-utils.h
+++ b/src/nact/nact-gtk-utils.h
@@ -60,6 +60,12 @@ void       nact_gtk_utils_select_file( BaseWindow *window,
 				GtkWidget *entry, const gchar *entry_name,
 				const gchar *default_dir_uri );
 
+void       nact_gtk_utils_select_file_with_preview( BaseWindow *window,
+				const gchar *title, const gchar *dialog_name,
+				GtkWidget *entry, const gchar *entry_name,
+				const gchar *default_dir_uri,
+				GCallback update_preview_cb );
+
 void       nact_gtk_utils_select_dir( BaseWindow *window,
 				const gchar *title, const gchar *dialog_name,
 				GtkWidget *entry, const gchar *entry_name,
diff --git a/src/nact/nact-iaction-tab.c b/src/nact/nact-iaction-tab.c
index b2d2a4c..0632f51 100644
--- a/src/nact/nact-iaction-tab.c
+++ b/src/nact/nact-iaction-tab.c
@@ -98,6 +98,7 @@ static GtkTreeModel *create_stock_icon_model( void );
 static void          icon_combo_list_fill( GtkComboBoxEntry* combo );
 static void          on_icon_browse( GtkButton *button, NactIActionTab *instance );
 static void          on_icon_changed( GtkEntry *entry, NactIActionTab *instance );
+static void          icon_preview_cb( GtkFileChooser *dialog, GtkWidget *preview );
 static gint          sort_stock_ids( gconstpointer a, gconstpointer b );
 static gchar        *strip_underscore( const gchar *text );
 static void          release_icon_combobox( NactIActionTab *instance );
@@ -871,10 +872,10 @@ on_icon_browse( GtkButton *button, NactIActionTab *instance )
 
 	icon_widget = base_window_get_widget( BASE_WINDOW( instance ), "ActionIconComboBoxEntry" );
 
-	nact_gtk_utils_select_file(
+	nact_gtk_utils_select_file_with_preview(
 			BASE_WINDOW( instance ),
 			_( "Choosing an icon" ), IPREFS_ICONS_DIALOG,
-			gtk_bin_get_child( GTK_BIN( icon_widget )), IPREFS_ICONS_PATH, "" );
+			gtk_bin_get_child( GTK_BIN( icon_widget )), IPREFS_ICONS_PATH, "", G_CALLBACK( icon_preview_cb ));
 }
 
 static void
@@ -907,6 +908,26 @@ on_icon_changed( GtkEntry *icon_entry, NactIActionTab *instance )
 	nact_gtk_utils_render( icon_name, image, GTK_ICON_SIZE_MENU );
 }
 
+static void
+icon_preview_cb( GtkFileChooser *dialog, GtkWidget *preview )
+{
+	char *filename;
+	GdkPixbuf *pixbuf;
+	gboolean have_preview;
+
+	filename = gtk_file_chooser_get_preview_filename( dialog );
+	pixbuf = gdk_pixbuf_new_from_file_at_size( filename, 128, 128, NULL );
+	have_preview = ( pixbuf != NULL );
+	g_free( filename );
+
+	if( have_preview ){
+		gtk_image_set_from_pixbuf( GTK_IMAGE( preview ), pixbuf );
+		g_object_unref( pixbuf );
+	}
+
+	gtk_file_chooser_set_preview_widget_active( dialog, have_preview );
+}
+
 static gint
 sort_stock_ids( gconstpointer a, gconstpointer b )
 {