[evolution] ECanvas cleanups.

From: Matthew Barnes <mbarnes src gnome org>
To: commits-list gnome org
Cc:
Subject: [evolution] ECanvas cleanups.
Date: Thu, 12 Aug 2010 19:43:05 +0000 (UTC)
commit 6caf022926a6dc7ae0a84e514510def0de87109a
Author: Matthew Barnes <mbarnes redhat com>
Date:   Thu Aug 12 15:05:34 2010 -0400

    ECanvas cleanups.

 widgets/misc/e-calendar.c |    2 +-
 widgets/misc/e-canvas.c   |  689 ++++++++++++++++++++++-----------------------
 widgets/misc/e-canvas.h   |  125 +++++----
 3 files changed, 410 insertions(+), 406 deletions(-)
---
diff --git a/widgets/misc/e-calendar.c b/widgets/misc/e-calendar.c
index fd8f882..bf556ae 100644
--- a/widgets/misc/e-calendar.c
+++ b/widgets/misc/e-calendar.c
@@ -97,7 +97,7 @@ static void e_calendar_start_auto_move	(ECalendar	*cal,
 static gboolean e_calendar_auto_move_handler	(gpointer	 data);
 static void e_calendar_stop_auto_move	(ECalendar	*cal);
 
-G_DEFINE_TYPE (ECalendar, e_calendar, E_CANVAS_TYPE)
+G_DEFINE_TYPE (ECalendar, e_calendar, E_TYPE_CANVAS)
 
 static void
 e_calendar_class_init (ECalendarClass *class)
diff --git a/widgets/misc/e-canvas.c b/widgets/misc/e-canvas.c
index 3b8d5ed..8d4336e 100644
--- a/widgets/misc/e-canvas.c
+++ b/widgets/misc/e-canvas.c
@@ -28,24 +28,6 @@
 
 #include "e-canvas.h"
 
-static void e_canvas_dispose        (GObject        *object);
-static void e_canvas_realize        (GtkWidget        *widget);
-static void e_canvas_unrealize      (GtkWidget        *widget);
-static gint e_canvas_key            (GtkWidget        *widget,
-				     GdkEventKey      *event);
-static gint e_canvas_button         (GtkWidget        *widget,
-				     GdkEventButton   *event);
-
-static gint e_canvas_focus_in       (GtkWidget        *widget,
-				     GdkEventFocus    *event);
-static gint e_canvas_focus_out      (GtkWidget        *widget,
-				     GdkEventFocus    *event);
-
-static void e_canvas_style_set      (GtkWidget        *widget,
-				     GtkStyle         *previous_style);
-
-static gint emit_event (GnomeCanvas *canvas, GdkEvent *event);
-
 #define d(x)
 
 enum {
@@ -53,95 +35,15 @@ enum {
 	LAST_SIGNAL
 };
 
-static guint e_canvas_signals [LAST_SIGNAL] = { 0, };
+static guint signals[LAST_SIGNAL];
 
 G_DEFINE_TYPE (ECanvas, e_canvas, GNOME_TYPE_CANVAS)
 
-static void
-e_canvas_class_init (ECanvasClass *klass)
-{
-	GObjectClass *object_class;
-	GtkWidgetClass *widget_class;
-
-	object_class                       = (GObjectClass*) klass;
-	widget_class                       = (GtkWidgetClass *) klass;
-
-	object_class->dispose              = e_canvas_dispose;
-
-	widget_class->key_press_event      = e_canvas_key;
-	widget_class->key_release_event    = e_canvas_key;
-	widget_class->button_press_event   = e_canvas_button;
-	widget_class->button_release_event = e_canvas_button;
-	widget_class->focus_in_event       = e_canvas_focus_in;
-	widget_class->focus_out_event      = e_canvas_focus_out;
-	widget_class->style_set            = e_canvas_style_set;
-	widget_class->realize              = e_canvas_realize;
-	widget_class->unrealize            = e_canvas_unrealize;
-
-	klass->reflow                      = NULL;
-
-	e_canvas_signals [REFLOW] =
-		g_signal_new ("reflow",
-			      G_OBJECT_CLASS_TYPE (object_class),
-			      G_SIGNAL_RUN_LAST,
-			      G_STRUCT_OFFSET (ECanvasClass, reflow),
-			      NULL, NULL,
-			      g_cclosure_marshal_VOID__VOID,
-			      G_TYPE_NONE, 0);
-}
-
-static void
-e_canvas_init (ECanvas *canvas)
-{
-	canvas->selection = NULL;
-	canvas->cursor = NULL;
-	canvas->im_context = gtk_im_multicontext_new ();
-	canvas->tooltip_window = NULL;
-}
-
-static void
-e_canvas_dispose (GObject *object)
-{
-	ECanvas *canvas = E_CANVAS(object);
-
-	if (canvas->idle_id)
-		g_source_remove(canvas->idle_id);
-	canvas->idle_id = 0;
-
-	if (canvas->grab_cancelled_check_id)
-		g_source_remove (canvas->grab_cancelled_check_id);
-	canvas->grab_cancelled_check_id = 0;
-
-	if (canvas->toplevel) {
-		if (canvas->visibility_notify_id)
-			g_signal_handler_disconnect (canvas->toplevel,
-						     canvas->visibility_notify_id);
-		canvas->visibility_notify_id = 0;
-
-		g_object_unref (canvas->toplevel);
-		canvas->toplevel = NULL;
-	}
-
-	if (canvas->im_context) {
-		g_object_unref (canvas->im_context);
-		canvas->im_context = NULL;
-	}
-
-	if ((G_OBJECT_CLASS (e_canvas_parent_class))->dispose)
-		(*(G_OBJECT_CLASS (e_canvas_parent_class))->dispose) (object);
-}
-
-GtkWidget *
-e_canvas_new (void)
-{
-	return GTK_WIDGET (g_object_new (E_CANVAS_TYPE, NULL));
-}
-
-/* Emits an event for an item in the canvas, be it the current item, grabbed
- * item, or focused item, as appropriate.
- */
+/* Emits an event for an item in the canvas, be it the current
+ * item, grabbed item, or focused item, as appropriate. */
 static gint
-emit_event (GnomeCanvas *canvas, GdkEvent *event)
+canvas_emit_event (GnomeCanvas *canvas,
+                   GdkEvent *event)
 {
 	GdkEvent *ev;
 	gint finished;
@@ -166,77 +68,77 @@ emit_event (GnomeCanvas *canvas, GdkEvent *event)
 
 	if (canvas->grabbed_item) {
 		switch (event->type) {
-		case GDK_ENTER_NOTIFY:
-			mask = GDK_ENTER_NOTIFY_MASK;
-			break;
+			case GDK_ENTER_NOTIFY:
+				mask = GDK_ENTER_NOTIFY_MASK;
+				break;
+
+			case GDK_LEAVE_NOTIFY:
+				mask = GDK_LEAVE_NOTIFY_MASK;
+				break;
+
+			case GDK_MOTION_NOTIFY:
+				mask = GDK_POINTER_MOTION_MASK;
+				break;
+
+			case GDK_BUTTON_PRESS:
+			case GDK_2BUTTON_PRESS:
+			case GDK_3BUTTON_PRESS:
+				mask = GDK_BUTTON_PRESS_MASK;
+				break;
+
+			case GDK_BUTTON_RELEASE:
+				mask = GDK_BUTTON_RELEASE_MASK;
+				break;
+
+			case GDK_KEY_PRESS:
+				mask = GDK_KEY_PRESS_MASK;
+				break;
+
+			case GDK_KEY_RELEASE:
+				mask = GDK_KEY_RELEASE_MASK;
+				break;
+
+			default:
+				mask = 0;
+				break;
+		}
+
+		if (!(mask & canvas->grabbed_event_mask))
+			return FALSE;
+	}
+
+	/* Convert to world coordinates -- we have two cases because of
+	 * different offsets of the fields in the event structures. */
+
+	ev = gdk_event_copy (event);
 
+	switch (ev->type) {
+		case GDK_ENTER_NOTIFY:
 		case GDK_LEAVE_NOTIFY:
-			mask = GDK_LEAVE_NOTIFY_MASK;
+			gnome_canvas_window_to_world (
+				canvas,
+				ev->crossing.x, ev->crossing.y,
+				&ev->crossing.x, &ev->crossing.y);
 			break;
 
 		case GDK_MOTION_NOTIFY:
-			mask = GDK_POINTER_MOTION_MASK;
-			break;
-
 		case GDK_BUTTON_PRESS:
 		case GDK_2BUTTON_PRESS:
 		case GDK_3BUTTON_PRESS:
-			mask = GDK_BUTTON_PRESS_MASK;
-			break;
-
 		case GDK_BUTTON_RELEASE:
-			mask = GDK_BUTTON_RELEASE_MASK;
-			break;
-
-		case GDK_KEY_PRESS:
-			mask = GDK_KEY_PRESS_MASK;
-			break;
-
-		case GDK_KEY_RELEASE:
-			mask = GDK_KEY_RELEASE_MASK;
+			gnome_canvas_window_to_world (
+				canvas,
+				ev->motion.x, ev->motion.y,
+				&ev->motion.x, &ev->motion.y);
 			break;
 
 		default:
-			mask = 0;
 			break;
-		}
-
-		if (!(mask & canvas->grabbed_event_mask))
-			return FALSE;
-	}
-
-	/* Convert to world coordinates -- we have two cases because of diferent
-	 * offsets of the fields in the event structures.
-	 */
-
-	ev = gdk_event_copy (event);
-
-	switch (ev->type) {
-	case GDK_ENTER_NOTIFY:
-	case GDK_LEAVE_NOTIFY:
-		gnome_canvas_window_to_world (canvas,
-					      ev->crossing.x, ev->crossing.y,
-					      &ev->crossing.x, &ev->crossing.y);
-		break;
-
-	case GDK_MOTION_NOTIFY:
-	case GDK_BUTTON_PRESS:
-	case GDK_2BUTTON_PRESS:
-	case GDK_3BUTTON_PRESS:
-	case GDK_BUTTON_RELEASE:
-		gnome_canvas_window_to_world (canvas,
-					      ev->motion.x, ev->motion.y,
-					      &ev->motion.x, &ev->motion.y);
-		break;
-
-	default:
-		break;
 	}
 
-	/* The event is propagated up the hierarchy (for if someone connected to
-	 * a group instead of a leaf event), and emission is stopped if a
-	 * handler returns TRUE, just like for GtkWidget events.
-	 */
+	/* The event is propagated up the hierarchy (for if someone connected
+	 * to a group instead of a leaf event), and emission is stopped if a
+	 * handler returns TRUE, just like for GtkWidget events. */
 
 	finished = FALSE;
 
@@ -256,28 +158,10 @@ emit_event (GnomeCanvas *canvas, GdkEvent *event)
 	return finished;
 }
 
-/* Key event handler for the canvas */
-static gint
-e_canvas_key (GtkWidget *widget, GdkEventKey *event)
-{
-	GnomeCanvas *canvas;
-	GdkEvent full_event;
-
-	g_return_val_if_fail (widget != NULL, FALSE);
-	g_return_val_if_fail (GNOME_IS_CANVAS (widget), FALSE);
-	g_return_val_if_fail (event != NULL, FALSE);
-
-	canvas = GNOME_CANVAS (widget);
-
-	full_event.key = *event;
-
-	return emit_event (canvas, &full_event);
-}
-
-/* This routine invokes the point method of the item.  The argument x, y should
- * be in the parent's item-relative coordinate system.  This routine applies the
- * inverse of the item's transform, maintaining the affine invariant.
- */
+/* This routine invokes the point method of the item.  The argument x, y
+ * should be in the parent's item-relative coordinate system.  This routine
+ * applies the inverse of the item's transform, maintaining the affine
+ * invariant. */
 #define HACKISH_AFFINE
 
 static double
@@ -423,11 +307,12 @@ pick_current_item (GnomeCanvas *canvas, GdkEvent *event)
 		new_event.crossing.detail = GDK_NOTIFY_ANCESTOR;
 		new_event.crossing.subwindow = NULL;
 		canvas->in_repick = TRUE;
-		retval = emit_event (canvas, &new_event);
+		retval = canvas_emit_event (canvas, &new_event);
 		canvas->in_repick = FALSE;
 	}
 
-	/* new_current_item may have been set to NULL during the call to emit_event() above */
+	/* new_current_item may have been set to NULL during
+	 * the call to canvas_emit_event() above. */
 
 	if ((canvas->new_current_item != canvas->current_item) && button_down) {
 		canvas->left_grabbed_item = TRUE;
@@ -446,22 +331,117 @@ pick_current_item (GnomeCanvas *canvas, GdkEvent *event)
 		new_event.type = GDK_ENTER_NOTIFY;
 		new_event.crossing.detail = GDK_NOTIFY_ANCESTOR;
 		new_event.crossing.subwindow = NULL;
-		retval = emit_event (canvas, &new_event);
+		retval = canvas_emit_event (canvas, &new_event);
 	}
 
 	return retval;
 }
 
-/* Button event handler for the canvas */
+static void
+canvas_style_set_recursive (GnomeCanvasItem *item,
+                            GtkStyle *previous_style)
+{
+	guint signal_id = g_signal_lookup ("style_set", G_OBJECT_TYPE (item));
+	if (signal_id >= 1) {
+		GSignalQuery query;
+		g_signal_query (signal_id, &query);
+		if (query.return_type == G_TYPE_NONE &&
+			query.n_params == 1 &&
+			query.param_types[0] == GTK_TYPE_STYLE) {
+			g_signal_emit (item, signal_id, 0, previous_style);
+		}
+	}
+
+	if (GNOME_IS_CANVAS_GROUP (item) ) {
+		GList *items = GNOME_CANVAS_GROUP (item)->item_list;
+		for (; items; items = items->next)
+			canvas_style_set_recursive (
+				items->data, previous_style);
+	}
+}
+
+static void
+canvas_dispose (GObject *object)
+{
+	ECanvas *canvas = E_CANVAS(object);
+
+	if (canvas->idle_id)
+		g_source_remove(canvas->idle_id);
+	canvas->idle_id = 0;
+
+	if (canvas->grab_cancelled_check_id)
+		g_source_remove (canvas->grab_cancelled_check_id);
+	canvas->grab_cancelled_check_id = 0;
+
+	if (canvas->toplevel) {
+		if (canvas->visibility_notify_id)
+			g_signal_handler_disconnect (canvas->toplevel,
+						     canvas->visibility_notify_id);
+		canvas->visibility_notify_id = 0;
+
+		g_object_unref (canvas->toplevel);
+		canvas->toplevel = NULL;
+	}
+
+	if (canvas->im_context) {
+		g_object_unref (canvas->im_context);
+		canvas->im_context = NULL;
+	}
+
+	/* Chain up to parent's dispose() method. */
+	G_OBJECT_CLASS (e_canvas_parent_class)->dispose (object);
+}
+
+static void
+canvas_realize (GtkWidget *widget)
+{
+	ECanvas *ecanvas = E_CANVAS (widget);
+	GdkWindow *window;
+
+	/* Chain up to parent's realize() method. */
+	GTK_WIDGET_CLASS (e_canvas_parent_class)->realize (widget);
+
+	window = gtk_layout_get_bin_window (GTK_LAYOUT (widget));
+	gdk_window_set_back_pixmap (window, NULL, FALSE);
+
+	window = gtk_widget_get_window (widget);
+	gtk_im_context_set_client_window (ecanvas->im_context, window);
+}
+
+static void
+canvas_unrealize (GtkWidget *widget)
+{
+	ECanvas * ecanvas = E_CANVAS (widget);
+
+	if (ecanvas->idle_id) {
+		g_source_remove(ecanvas->idle_id);
+		ecanvas->idle_id = 0;
+	}
+
+	gtk_im_context_set_client_window (ecanvas->im_context, NULL);
+
+	/* Chain up to parent's unrealize() method. */
+	GTK_WIDGET_CLASS (e_canvas_parent_class)->unrealize (widget);
+}
+
+static void
+canvas_style_set (GtkWidget *widget,
+                  GtkStyle *previous_style)
+{
+	canvas_style_set_recursive (
+		GNOME_CANVAS_ITEM (gnome_canvas_root (
+		GNOME_CANVAS (widget))), previous_style);
+}
+
 static gint
-e_canvas_button (GtkWidget *widget, GdkEventButton *event)
+canvas_button_event (GtkWidget *widget,
+                     GdkEventButton *event)
 {
 	GnomeCanvas *canvas;
 	GdkWindow *bin_window;
 	gint mask;
 	gint retval;
 
-	g_return_val_if_fail (widget != NULL, FALSE);
 	g_return_val_if_fail (GNOME_IS_CANVAS (widget), FALSE);
 	g_return_val_if_fail (event != NULL, FALSE);
 
@@ -482,109 +462,75 @@ e_canvas_button (GtkWidget *widget, GdkEventButton *event)
 		return retval;
 
 	switch (event->button) {
-	case 1:
-		mask = GDK_BUTTON1_MASK;
-		break;
-	case 2:
-		mask = GDK_BUTTON2_MASK;
-		break;
-	case 3:
-		mask = GDK_BUTTON3_MASK;
-		break;
-	case 4:
-		mask = GDK_BUTTON4_MASK;
-		break;
-	case 5:
-		mask = GDK_BUTTON5_MASK;
-		break;
-	default:
-		mask = 0;
+		case 1:
+			mask = GDK_BUTTON1_MASK;
+			break;
+		case 2:
+			mask = GDK_BUTTON2_MASK;
+			break;
+		case 3:
+			mask = GDK_BUTTON3_MASK;
+			break;
+		case 4:
+			mask = GDK_BUTTON4_MASK;
+			break;
+		case 5:
+			mask = GDK_BUTTON5_MASK;
+			break;
+		default:
+			mask = 0;
 	}
 
 	switch (event->type) {
-	case GDK_BUTTON_PRESS:
-	case GDK_2BUTTON_PRESS:
-	case GDK_3BUTTON_PRESS:
-		/* Pick the current item as if the button were not pressed, and
-		 * then process the event.
-		 */
-		canvas->state = event->state;
-		pick_current_item (canvas, (GdkEvent *) event);
-		canvas->state ^= mask;
-		retval = emit_event (canvas, (GdkEvent *) event);
-		break;
-
-	case GDK_BUTTON_RELEASE:
-		/* Process the event as if the button were pressed, then repick
-		 * after the button has been released
-		 */
-		canvas->state = event->state;
-		retval = emit_event (canvas, (GdkEvent *) event);
-		event->state ^= mask;
-		canvas->state = event->state;
-		pick_current_item (canvas, (GdkEvent *) event);
-		event->state ^= mask;
-		break;
-
-	default:
-		g_return_val_if_reached(0);
+		case GDK_BUTTON_PRESS:
+		case GDK_2BUTTON_PRESS:
+		case GDK_3BUTTON_PRESS:
+			/* Pick the current item as if the button were not
+			 * pressed, and then process the event. */
+			canvas->state = event->state;
+			pick_current_item (canvas, (GdkEvent *) event);
+			canvas->state ^= mask;
+			retval = canvas_emit_event (canvas, (GdkEvent *) event);
+			break;
+
+		case GDK_BUTTON_RELEASE:
+			/* Process the event as if the button were pressed,
+			 * then repick after the button has been released. */
+			canvas->state = event->state;
+			retval = canvas_emit_event (canvas, (GdkEvent *) event);
+			event->state ^= mask;
+			canvas->state = event->state;
+			pick_current_item (canvas, (GdkEvent *) event);
+			event->state ^= mask;
+			break;
+
+		default:
+			g_return_val_if_reached (0);
 	}
 
 	return retval;
 }
 
-/**
- * e_canvas_item_grab_focus:
- * @item: A canvas item.
- * @widget_too: Whether or not to grab the widget-level focus too
- *
- * Makes the specified item take the keyboard focus, so all keyboard
- * events will be sent to it. If the canvas widget itself did not have
- * the focus and @widget_too is %TRUE, it grabs that focus as well.
- **/
-void
-e_canvas_item_grab_focus (GnomeCanvasItem *item, gboolean widget_too)
+static gint
+canvas_key_event (GtkWidget *widget,
+                  GdkEventKey *event)
 {
-	GnomeCanvasItem *focused_item;
-	GdkWindow *bin_window;
-	GdkEvent ev;
-
-	g_return_if_fail (item != NULL);
-	g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
-	g_return_if_fail (gtk_widget_get_can_focus (GTK_WIDGET (item->canvas)));
-
-	bin_window = gtk_layout_get_bin_window (GTK_LAYOUT (item->canvas));
-
-	focused_item = item->canvas->focused_item;
-
-	if (focused_item) {
-		ev.focus_change.type = GDK_FOCUS_CHANGE;
-		ev.focus_change.window = bin_window;
-		ev.focus_change.send_event = FALSE;
-		ev.focus_change.in = FALSE;
-
-		emit_event (item->canvas, &ev);
-	}
+	GnomeCanvas *canvas;
+	GdkEvent full_event;
 
-	item->canvas->focused_item = item;
+	g_return_val_if_fail (GNOME_IS_CANVAS (widget), FALSE);
+	g_return_val_if_fail (event != NULL, FALSE);
 
-	if (widget_too && !gtk_widget_has_focus (GTK_WIDGET(item->canvas))) {
-		gtk_widget_grab_focus (GTK_WIDGET (item->canvas));
-	}
+	canvas = GNOME_CANVAS (widget);
 
-	if (item) {
-		ev.focus_change.type = GDK_FOCUS_CHANGE;
-		ev.focus_change.window = bin_window;
-		ev.focus_change.send_event = FALSE;
-		ev.focus_change.in = TRUE;
+	full_event.key = *event;
 
-		emit_event (item->canvas, &ev);
-	}
+	return canvas_emit_event (canvas, &full_event);
 }
 
-/* Focus in handler for the canvas */
 static gint
-e_canvas_focus_in (GtkWidget *widget, GdkEventFocus *event)
+canvas_focus_in_event (GtkWidget *widget,
+                       GdkEventFocus *event)
 {
 	GnomeCanvas *canvas;
 	ECanvas *ecanvas;
@@ -603,15 +549,15 @@ e_canvas_focus_in (GtkWidget *widget, GdkEventFocus *event)
 
 	if (canvas->focused_item) {
 		full_event.focus_change = *event;
-		return emit_event (canvas, &full_event);
+		return canvas_emit_event (canvas, &full_event);
 	} else {
 		return FALSE;
 	}
 }
 
-/* Focus out handler for the canvas */
 static gint
-e_canvas_focus_out (GtkWidget *widget, GdkEventFocus *event)
+canvas_focus_out_event (GtkWidget *widget,
+                        GdkEventFocus *event)
 {
 	GnomeCanvas *canvas;
 	ECanvas *ecanvas;
@@ -630,75 +576,106 @@ e_canvas_focus_out (GtkWidget *widget, GdkEventFocus *event)
 
 	if (canvas->focused_item) {
 		full_event.focus_change = *event;
-		return emit_event (canvas, &full_event);
+		return canvas_emit_event (canvas, &full_event);
 	} else {
 		return FALSE;
 	}
 }
 
 static void
-ec_style_set_recursive (GnomeCanvasItem *item, GtkStyle *previous_style)
+e_canvas_class_init (ECanvasClass *class)
 {
-	guint signal_id = g_signal_lookup ("style_set", G_OBJECT_TYPE (item));
-	if (signal_id >= 1) {
-		GSignalQuery query;
-		g_signal_query (signal_id, &query);
-		if (query.return_type == G_TYPE_NONE &&
-			query.n_params == 1 &&
-			query.param_types[0] == GTK_TYPE_STYLE) {
-			g_signal_emit (item, signal_id, 0, previous_style);
-		}
-	}
+	GObjectClass *object_class;
+	GtkWidgetClass *widget_class;
 
-	if (GNOME_IS_CANVAS_GROUP (item) ) {
-		GList *items = GNOME_CANVAS_GROUP (item)->item_list;
-		for (; items; items = items->next)
-			ec_style_set_recursive (items->data, previous_style);
-	}
+	object_class = G_OBJECT_CLASS (class);
+	object_class->dispose = canvas_dispose;
+
+	widget_class = GTK_WIDGET_CLASS (class);
+	widget_class->realize = canvas_realize;
+	widget_class->unrealize = canvas_unrealize;
+	widget_class->style_set = canvas_style_set;
+	widget_class->button_press_event = canvas_button_event;
+	widget_class->button_release_event = canvas_button_event;
+	widget_class->key_press_event = canvas_key_event;
+	widget_class->key_release_event = canvas_key_event;
+	widget_class->focus_in_event = canvas_focus_in_event;
+	widget_class->focus_out_event = canvas_focus_out_event;
+
+	signals[REFLOW] = g_signal_new (
+		"reflow",
+		G_OBJECT_CLASS_TYPE (object_class),
+		G_SIGNAL_RUN_LAST,
+		G_STRUCT_OFFSET (ECanvasClass, reflow),
+		NULL, NULL,
+		g_cclosure_marshal_VOID__VOID,
+		G_TYPE_NONE, 0);
 }
 
 static void
-e_canvas_style_set (GtkWidget *widget, GtkStyle *previous_style)
+e_canvas_init (ECanvas *canvas)
 {
-	ec_style_set_recursive (
-		GNOME_CANVAS_ITEM (gnome_canvas_root (GNOME_CANVAS (widget))),
-		previous_style);
+	canvas->im_context = gtk_im_multicontext_new ();
 }
 
-static void
-e_canvas_realize (GtkWidget *widget)
+GtkWidget *
+e_canvas_new (void)
 {
-	ECanvas *ecanvas = E_CANVAS (widget);
-	GdkWindow *window;
+	return g_object_new (E_TYPE_CANVAS, NULL);
+}
 
-	if (GTK_WIDGET_CLASS (e_canvas_parent_class)->realize)
-		(* GTK_WIDGET_CLASS (e_canvas_parent_class)->realize) (widget);
+/**
+ * e_canvas_item_grab_focus:
+ * @item: A canvas item.
+ * @widget_too: Whether or not to grab the widget-level focus too
+ *
+ * Makes the specified item take the keyboard focus, so all keyboard
+ * events will be sent to it. If the canvas widget itself did not have
+ * the focus and @widget_too is %TRUE, it grabs that focus as well.
+ **/
+void
+e_canvas_item_grab_focus (GnomeCanvasItem *item,
+                          gboolean widget_too)
+{
+	GnomeCanvasItem *focused_item;
+	GdkWindow *bin_window;
+	GdkEvent ev;
 
-	window = gtk_layout_get_bin_window (GTK_LAYOUT (widget));
-	gdk_window_set_back_pixmap (window, NULL, FALSE);
+	g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
+	g_return_if_fail (gtk_widget_get_can_focus (GTK_WIDGET (item->canvas)));
 
-	window = gtk_widget_get_window (widget);
-	gtk_im_context_set_client_window (ecanvas->im_context, window);
-}
+	bin_window = gtk_layout_get_bin_window (GTK_LAYOUT (item->canvas));
 
-static void
-e_canvas_unrealize (GtkWidget *widget)
-{
-	ECanvas * ecanvas = E_CANVAS (widget);
+	focused_item = item->canvas->focused_item;
 
-	if (ecanvas->idle_id) {
-		g_source_remove(ecanvas->idle_id);
-		ecanvas->idle_id = 0;
+	if (focused_item) {
+		ev.focus_change.type = GDK_FOCUS_CHANGE;
+		ev.focus_change.window = bin_window;
+		ev.focus_change.send_event = FALSE;
+		ev.focus_change.in = FALSE;
+
+		canvas_emit_event (item->canvas, &ev);
 	}
 
-	gtk_im_context_set_client_window (ecanvas->im_context, NULL);
+	item->canvas->focused_item = item;
+
+	if (widget_too && !gtk_widget_has_focus (GTK_WIDGET(item->canvas))) {
+		gtk_widget_grab_focus (GTK_WIDGET (item->canvas));
+	}
 
-	if (GTK_WIDGET_CLASS (e_canvas_parent_class)->unrealize)
-		(* GTK_WIDGET_CLASS (e_canvas_parent_class)->unrealize) (widget);
+	if (item) {
+		ev.focus_change.type = GDK_FOCUS_CHANGE;
+		ev.focus_change.window = bin_window;
+		ev.focus_change.send_event = FALSE;
+		ev.focus_change.in = TRUE;
+
+		canvas_emit_event (item->canvas, &ev);
+	}
 }
 
 static void
-e_canvas_item_invoke_reflow (GnomeCanvasItem *item, gint flags)
+e_canvas_item_invoke_reflow (GnomeCanvasItem *item,
+                             gint flags)
 {
 	GnomeCanvasGroup *group;
 	GList *list;
@@ -747,8 +724,7 @@ idle_handler (gpointer data)
 	/* Reset idle id */
 	canvas->idle_id = 0;
 
-	g_signal_emit (canvas,
-		       e_canvas_signals [REFLOW], 0);
+	g_signal_emit (canvas, signals [REFLOW], 0);
 
 	GDK_THREADS_LEAVE();
 
@@ -780,6 +756,8 @@ e_canvas_item_descendent_needs_reflow (GnomeCanvasItem *item)
 void
 e_canvas_item_request_reflow (GnomeCanvasItem *item)
 {
+	g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
+
 	if (item->flags & GNOME_CANVAS_ITEM_REALIZED) {
 		item->flags |= E_CANVAS_ITEM_NEEDS_REFLOW;
 		e_canvas_item_descendent_needs_reflow(item);
@@ -790,15 +768,21 @@ e_canvas_item_request_reflow (GnomeCanvasItem *item)
 void
 e_canvas_item_request_parent_reflow (GnomeCanvasItem *item)
 {
-	g_return_if_fail(item != NULL);
-	g_return_if_fail(GNOME_IS_CANVAS_ITEM(item));
-	e_canvas_item_request_reflow(item->parent);
+	g_return_if_fail (GNOME_IS_CANVAS_ITEM(item));
+
+	e_canvas_item_request_reflow (item->parent);
 }
 
 void
-e_canvas_item_set_reflow_callback (GnomeCanvasItem *item, ECanvasItemReflowFunc func)
+e_canvas_item_set_reflow_callback (GnomeCanvasItem *item,
+                                   ECanvasItemReflowFunc func)
 {
-	g_object_set_data(G_OBJECT(item), "ECanvasItem::reflow_callback", (gpointer) func);
+	g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
+	g_return_if_fail (func != NULL);
+
+	g_object_set_data (
+		G_OBJECT(item), "ECanvasItem::reflow_callback",
+		(gpointer) func);
 }
 
 static gboolean
@@ -833,38 +817,43 @@ grab_cancelled_check (gpointer data)
 
 gint
 e_canvas_item_grab (ECanvas *canvas,
-		    GnomeCanvasItem *item,
-		    guint event_mask,
-		    GdkCursor *cursor,
-		    guint32 etime,
-		    ECanvasItemGrabCancelled cancelled_cb,
-		    gpointer cancelled_data)
+                    GnomeCanvasItem *item,
+                    guint event_mask,
+                    GdkCursor *cursor,
+                    guint32 etime,
+                    ECanvasItemGrabCancelled cancelled_cb,
+                    gpointer cancelled_data)
 {
-	if (gtk_grab_get_current ()) {
+	gint ret_val;
+
+	g_return_val_if_fail (E_IS_CANVAS (canvas), -1);
+	g_return_val_if_fail (GNOME_IS_CANVAS_ITEM (item), -1);
+
+	if (gtk_grab_get_current ())
 		return GDK_GRAB_ALREADY_GRABBED;
-	} else {
-		gint ret_val = gnome_canvas_item_grab (item, event_mask, cursor, etime);
-		if (ret_val == GDK_GRAB_SUCCESS) {
-			canvas->grab_cancelled_cb = cancelled_cb;
-			canvas->grab_cancelled_check_id =
-				g_timeout_add_full (G_PRIORITY_LOW,
-						    100,
-						    grab_cancelled_check,
-						    canvas,
-						    NULL);
-			canvas->grab_cancelled_time = etime;
-			canvas->grab_cancelled_data = cancelled_data;
-		}
 
-		return ret_val;
+	ret_val = gnome_canvas_item_grab (
+		item, event_mask, cursor, etime);
+	if (ret_val == GDK_GRAB_SUCCESS) {
+		canvas->grab_cancelled_cb = cancelled_cb;
+		canvas->grab_cancelled_check_id = g_timeout_add_full (
+			G_PRIORITY_LOW, 100,
+			grab_cancelled_check, canvas, NULL);
+		canvas->grab_cancelled_time = etime;
+		canvas->grab_cancelled_data = cancelled_data;
 	}
+
+	return ret_val;
 }
 
 void
 e_canvas_item_ungrab (ECanvas *canvas,
-		      GnomeCanvasItem *item,
-		      guint32 etime)
+                      GnomeCanvasItem *item,
+                      guint32 etime)
 {
+	g_return_if_fail (E_IS_CANVAS (canvas));
+	g_return_if_fail (GNOME_IS_CANVAS_ITEM (item));
+
 	if (canvas->grab_cancelled_check_id) {
 		g_source_remove (canvas->grab_cancelled_check_id);
 		canvas->grab_cancelled_cb = NULL;
diff --git a/widgets/misc/e-canvas.h b/widgets/misc/e-canvas.h
index ea2364c..fbcdd44 100644
--- a/widgets/misc/e-canvas.h
+++ b/widgets/misc/e-canvas.h
@@ -20,38 +20,51 @@
  *
  */
 
-#ifndef __E_CANVAS_H__
-#define __E_CANVAS_H__
+#ifndef E_CANVAS_H
+#define E_CANVAS_H
 
 #include <gtk/gtk.h>
 #include <libgnomecanvas/gnome-canvas.h>
 
-G_BEGIN_DECLS
-
 /* ECanvas - A class derived from canvas for the purpose of adding
- * evolution specific canvas hacks.
- */
+ * evolution specific canvas hacks. */
+
+/* Standard GObject macros */
+#define E_TYPE_CANVAS \
+	(e_canvas_get_type ())
+#define E_CANVAS(obj) \
+	(G_TYPE_CHECK_INSTANCE_CAST \
+	((obj), E_TYPE_CANVAS, ECanvas))
+#define E_CANVAS_CLASS(cls) \
+	(G_TYPE_CHECK_CLASS_CAST \
+	((cls), E_TYPE_CANVAS, ECanvasClass))
+#define E_IS_CANVAS(obj) \
+	(G_TYPE_CHECK_INSTANCE_TYPE \
+	((obj), E_TYPE_CANVAS))
+#define E_IS_CANVAS_CLASS(cls) \
+	(G_TYPE_CHECK_CLASS_TYPE \
+	((cls), E_TYPE_CANVAS))
+#define E_CANVAS_GET_CLASS(obj) \
+	(G_TYPE_INSTANCE_GET_CLASS \
+	((obj), E_TYPE_CANVAS, ECanvasClass))
 
-#define E_CANVAS_TYPE			(e_canvas_get_type ())
-#define E_CANVAS(obj)			(G_TYPE_CHECK_INSTANCE_CAST ((obj), E_CANVAS_TYPE, ECanvas))
-#define E_CANVAS_CLASS(klass)		(G_TYPE_CHECK_CLASS_CAST ((klass), E_CANVAS_TYPE, ECanvasClass))
-#define E_IS_CANVAS(obj)		(G_TYPE_CHECK_INSTANCE_TYPE ((obj), E_CANVAS_TYPE))
-#define E_IS_CANVAS_CLASS(klass)	(G_TYPE_CHECK_CLASS_TYPE ((obj), E_CANVAS_TYPE))
+G_BEGIN_DECLS
 
-typedef void		(*ECanvasItemReflowFunc)		(GnomeCanvasItem *item,
-								 gint	  flags);
+typedef void	(*ECanvasItemReflowFunc)	(GnomeCanvasItem *item,
+						 gint flags);
 
-typedef void            (*ECanvasItemSelectionFunc)             (GnomeCanvasItem *item,
-								 gint             flags,
-								 gpointer         user_data);
+typedef void	(*ECanvasItemSelectionFunc)	(GnomeCanvasItem *item,
+						 gint flags,
+						 gpointer user_data);
 /* Returns the same as strcmp does. */
-typedef gint            (*ECanvasItemSelectionCompareFunc)      (GnomeCanvasItem *item,
-								 gpointer         data1,
-								 gpointer         data2,
-								 gint             flags);
+typedef gint	(*ECanvasItemSelectionCompareFunc)
+						(GnomeCanvasItem *item,
+						 gpointer data1,
+						 gpointer data2,
+						 gint flags);
 
-typedef struct _ECanvas       ECanvas;
-typedef struct _ECanvasClass  ECanvasClass;
+typedef struct _ECanvas ECanvas;
+typedef struct _ECanvasClass ECanvasClass;
 
 /* Object flags for items */
 enum {
@@ -70,18 +83,20 @@ typedef struct {
 	gpointer         id;
 } ECanvasSelectionInfo;
 
-typedef void (*ECanvasItemGrabCancelled) (ECanvas *canvas, GnomeCanvasItem *item, gpointer data);
+typedef void	(*ECanvasItemGrabCancelled)	(ECanvas *canvas,
+						 GnomeCanvasItem *item,
+						 gpointer data);
 
-struct _ECanvas
-{
+struct _ECanvas {
 	GnomeCanvas parent;
-	gint                   idle_id;
-	GList                *selection;
+
+	gint idle_id;
+	GList *selection;
 	ECanvasSelectionInfo *cursor;
 
-	GtkWidget            *tooltip_window;
-	gint                   visibility_notify_id;
-	GtkWidget            *toplevel;
+	GtkWidget *tooltip_window;
+	gint visibility_notify_id;
+	GtkWidget *toplevel;
 
 	/* Input context for dead key support */
 	GtkIMContext *im_context;
@@ -92,36 +107,36 @@ struct _ECanvas
 	gpointer grab_cancelled_data;
 };
 
-struct _ECanvasClass
-{
+struct _ECanvasClass {
 	GnomeCanvasClass parent_class;
-	void (* reflow) (ECanvas *canvas);
+
+	void		(*reflow)		(ECanvas *canvas);
 };
 
-GType      e_canvas_get_type                             (void);
-GtkWidget *e_canvas_new                                  (void);
+GType		e_canvas_get_type		(void);
+GtkWidget *	e_canvas_new			(void);
 
 /* Used to send all of the keystroke events to a specific item as well as
- * GDK_FOCUS_CHANGE events.
- */
-void       e_canvas_item_grab_focus                      (GnomeCanvasItem                 *item,
-							  gboolean                         widget_too);
-void       e_canvas_item_request_reflow                  (GnomeCanvasItem                 *item);
-void       e_canvas_item_request_parent_reflow           (GnomeCanvasItem                 *item);
-void       e_canvas_item_set_reflow_callback             (GnomeCanvasItem                 *item,
-							  ECanvasItemReflowFunc            func);
-
-gint        e_canvas_item_grab                            (ECanvas                         *canvas,
-							  GnomeCanvasItem                 *item,
-							  guint                            event_mask,
-							  GdkCursor                       *cursor,
-							  guint32                          etime,
-							  ECanvasItemGrabCancelled         cancelled,
-							  gpointer                         cancelled_data);
-void       e_canvas_item_ungrab                          (ECanvas                         *canvas,
-							  GnomeCanvasItem                 *item,
-							  guint32                          etime);
+ * GDK_FOCUS_CHANGE events. */
+void		e_canvas_item_grab_focus	(GnomeCanvasItem *item,
+						 gboolean widget_too);
+void		e_canvas_item_request_reflow	(GnomeCanvasItem *item);
+void		e_canvas_item_request_parent_reflow
+						(GnomeCanvasItem *item);
+void		e_canvas_item_set_reflow_callback
+						(GnomeCanvasItem *item,
+						 ECanvasItemReflowFunc func); 
+gint		e_canvas_item_grab		(ECanvas *canvas,
+						 GnomeCanvasItem *item,
+						 guint event_mask,
+						 GdkCursor *cursor,
+						 guint32 etime,
+						 ECanvasItemGrabCancelled cancelled,
+						 gpointer cancelled_data);
+void		e_canvas_item_ungrab		(ECanvas *canvas,
+						 GnomeCanvasItem *item,
+						 guint32 etime);
 
 G_END_DECLS
 
-#endif /* __E_CANVAS_H__ */
+#endif /* E_CANVAS_H */
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