Handle shift-tab properly now.

2000-01-25  Christopher James Lahey  <clahey@helixcode.com>

        * widgets/e-reflow.c, widgets/e-minicard.c: Handle shift-tab
        properly now.

        * widgets/e-minicard-label.c: Reindented some areas.

        * widgets/test-reflow.c: Use e-canvas.  Set the back pixmap to
        NULL for the canvas so that scrolling won't flash grey.

        * widgets/e-canvas.c, widgets/e-canvas.h: These subclass
        GnomeCanvas to work around a few bugs so that evolution will work
        well with old versions of gnome-libs.

        * widgets/Makefile.am: Added e-canvas.c and e-canvas.h.

        * addressbook/contact-editor/contact-editor.glade: Not much
        change.  Mostly internal reorganization by glade itself.

svn path=/trunk/; revision=1638

1 files changed, 233 insertions, 0 deletions

diff --git a/widgets/misc/e-canvas.c b/widgets/misc/e-canvas.c
new file mode 100644
index 0000000000..74af105b36
--- /dev/null
+++ b/widgets/misc/e-canvas.c
@@ -0,0 +1,233 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
+/* 
+ * e-canvas.c
+ * Copyright (C) 2000  Helix Code, Inc.
+ * Author: Chris Lahey <clahey@helixcode.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include <gnome.h>
+#include "e-canvas.h"
+static void e_canvas_init		(ECanvas		 *card);
+static void e_canvas_class_init	(ECanvasClass	 *klass);
+static gint e_canvas_key            (GtkWidget        *widget,
+				     GdkEventKey      *event);
+
+static int emit_event (GnomeCanvas *canvas, GdkEvent *event);
+
+static GnomeCanvasClass *parent_class = NULL;
+
+GtkType
+e_canvas_get_type (void)
+{
+  static GtkType canvas_type = 0;
+
+  if (!canvas_type)
+    {
+      static const GtkTypeInfo canvas_info =
+      {
+        "ECanvas",
+        sizeof (ECanvas),
+        sizeof (ECanvasClass),
+        (GtkClassInitFunc) e_canvas_class_init,
+        (GtkObjectInitFunc) e_canvas_init,
+        /* reserved_1 */ NULL,
+        /* reserved_2 */ NULL,
+        (GtkClassInitFunc) NULL,
+      };
+
+      canvas_type = gtk_type_unique (gnome_canvas_get_type (), &canvas_info);
+    }
+
+  return canvas_type;
+}
+
+static void
+e_canvas_class_init (ECanvasClass *klass)
+{
+	GtkObjectClass *object_class;
+	GnomeCanvasClass *canvas_class;
+	GtkWidgetClass *widget_class;
+	
+	object_class = (GtkObjectClass*) klass;
+	canvas_class = (GnomeCanvasClass *) klass;
+	widget_class = (GtkWidgetClass *) klass;
+	
+	parent_class = gtk_type_class (gnome_canvas_get_type ());
+
+	widget_class->key_press_event = e_canvas_key;
+	widget_class->key_release_event = e_canvas_key;
+}
+
+static void
+e_canvas_init (ECanvas *canvas)
+{
+}
+
+GtkWidget *
+e_canvas_new()
+{
+	return GTK_WIDGET (gtk_type_new (e_canvas_get_type ()));
+}
+
+
+/* Returns whether the item is an inferior of or is equal to the parent. */
+static int
+is_descendant (GnomeCanvasItem *item, GnomeCanvasItem *parent)
+{
+	for (; item; item = item->parent)
+		if (item == parent)
+			return TRUE;
+
+	return FALSE;
+}
+
+/* Emits an event for an item in the canvas, be it the current item, grabbed
+ * item, or focused item, as appropriate.
+ */
+static int
+emit_event (GnomeCanvas *canvas, GdkEvent *event)
+{
+	GdkEvent ev;
+	gint finished;
+	GnomeCanvasItem *item;
+	GnomeCanvasItem *parent;
+	guint mask;
+
+	/* Perform checks for grabbed items */
+
+	if (canvas->grabbed_item && !is_descendant (canvas->current_item, canvas->grabbed_item))
+		return FALSE;
+
+	if (canvas->grabbed_item) {
+		switch (event->type) {
+		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 diferent
+	 * offsets of the fields in the event structures.
+	 */
+
+	ev = *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;
+	}
+
+	/* Choose where we send the event */
+
+	item = canvas->current_item;
+
+	if (canvas->focused_item
+	    && ((event->type == GDK_KEY_PRESS) || (event->type == GDK_KEY_RELEASE) || (event->type == GDK_FOCUS_CHANGE)))
+		item = canvas->focused_item;
+
+	/* 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;
+
+	while (item && !finished) {
+		gtk_object_ref (GTK_OBJECT (item));
+
+		gtk_signal_emit_by_name (GTK_OBJECT (item), "event",
+					 &ev,
+					 &finished);
+
+		if (GTK_OBJECT_DESTROYED (item))
+			finished = TRUE;
+
+		parent = item->parent;
+		gtk_object_unref (GTK_OBJECT (item));
+
+		item = parent;
+	}
+
+	return finished;
+}
+
+/* Key event handler for the canvas */
+static gint
+e_canvas_key (GtkWidget *widget, GdkEventKey *event)
+{
+	GnomeCanvas *canvas;
+
+	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);
+
+	return emit_event (canvas, (GdkEvent *) event);
+}
+