diff options
Diffstat (limited to 'widgets/misc/e-canvas.c')
| -rw-r--r-- | widgets/misc/e-canvas.c | 445 |
1 files changed, 0 insertions, 445 deletions
diff --git a/widgets/misc/e-canvas.c b/widgets/misc/e-canvas.c deleted file mode 100644 index ad0819e3dd..0000000000 --- a/widgets/misc/e-canvas.c +++ /dev/null @@ -1,445 +0,0 @@ -/* -*- 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 void e_canvas_realize (GtkWidget *widget); -static gint e_canvas_key (GtkWidget *widget, - GdkEventKey *event); - -static gint e_canvas_focus_in (GtkWidget *widget, - GdkEventFocus *event); -static gint e_canvas_focus_out (GtkWidget *widget, - GdkEventFocus *event); - -static int emit_event (GnomeCanvas *canvas, GdkEvent *event); - -static GnomeCanvasClass *parent_class = NULL; - -enum { - REFLOW, - LAST_SIGNAL -}; - -static guint e_canvas_signals [LAST_SIGNAL] = { 0, }; - -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; - widget_class->focus_in_event = e_canvas_focus_in; - widget_class->focus_out_event = e_canvas_focus_out; - widget_class->realize = e_canvas_realize; - - klass->reflow = NULL; - - e_canvas_signals [REFLOW] = - gtk_signal_new ("reflow", - GTK_RUN_LAST, - object_class->type, - GTK_SIGNAL_OFFSET (ECanvasClass, reflow), - gtk_marshal_NONE__NONE, - GTK_TYPE_NONE, 0); - - gtk_object_class_add_signals (object_class, e_canvas_signals, LAST_SIGNAL); -} - -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); -} - - -/** - * e_canvas_item_grab_focus: - * @item: A canvas item. - * - * 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, it grabs - * it as well. - **/ -void -e_canvas_item_grab_focus (GnomeCanvasItem *item) -{ - GnomeCanvasItem *focused_item; - GdkEvent ev; - - g_return_if_fail (item != NULL); - g_return_if_fail (GNOME_IS_CANVAS_ITEM (item)); - g_return_if_fail (GTK_WIDGET_CAN_FOCUS (GTK_WIDGET (item->canvas))); - - focused_item = item->canvas->focused_item; - - if (focused_item) { - ev.focus_change.type = GDK_FOCUS_CHANGE; - ev.focus_change.window = GTK_LAYOUT (item->canvas)->bin_window; - ev.focus_change.send_event = FALSE; - ev.focus_change.in = FALSE; - - emit_event (item->canvas, &ev); - } - - item->canvas->focused_item = item; - - if (!GTK_WIDGET_HAS_FOCUS (GTK_WIDGET(item->canvas))) { - gtk_widget_grab_focus (GTK_WIDGET (item->canvas)); - } - - if (focused_item) { - ev.focus_change.type = GDK_FOCUS_CHANGE; - ev.focus_change.window = GTK_LAYOUT (item->canvas)->bin_window; - ev.focus_change.send_event = FALSE; - ev.focus_change.in = TRUE; - - emit_event (item->canvas, &ev); - } -} - -/* Focus in handler for the canvas */ -static gint -e_canvas_focus_in (GtkWidget *widget, GdkEventFocus *event) -{ - GnomeCanvas *canvas; - - canvas = GNOME_CANVAS (widget); - - if (canvas->focused_item) - return emit_event (canvas, (GdkEvent *) event); - else - return FALSE; -} - -/* Focus out handler for the canvas */ -static gint -e_canvas_focus_out (GtkWidget *widget, GdkEventFocus *event) -{ - GnomeCanvas *canvas; - - canvas = GNOME_CANVAS (widget); - - if (canvas->focused_item) - return emit_event (canvas, (GdkEvent *) event); - else - return FALSE; -} - -static void -e_canvas_realize (GtkWidget *widget) -{ - if (GTK_WIDGET_CLASS (parent_class)->realize) - (* GTK_WIDGET_CLASS (parent_class)->realize) (widget); - - gdk_window_set_back_pixmap (GTK_LAYOUT (widget)->bin_window, NULL, FALSE); -} - -static void -e_canvas_item_invoke_reflow (GnomeCanvasItem *item, int flags) -{ - GnomeCanvasGroup *group; - GList *list; - GnomeCanvasItem *child; - - if (GNOME_IS_CANVAS_GROUP (item)) { - group = GNOME_CANVAS_GROUP (item); - for (list = group->item_list; list; list = list->next) { - child = GNOME_CANVAS_ITEM (list->data); - if (child->object.flags & E_CANVAS_ITEM_DESCENDENT_NEEDS_REFLOW) - e_canvas_item_invoke_reflow (child, flags); - } - } - - if (item->object.flags & E_CANVAS_ITEM_NEEDS_REFLOW) { - ECanvasItemReflowFunc func; - func = gtk_object_get_data (GTK_OBJECT (item), - "ECanvasItem::reflow_callback"); - if (func) - func (item, flags); - } - - item->object.flags &= ~E_CANVAS_ITEM_NEEDS_REFLOW; - item->object.flags &= ~E_CANVAS_ITEM_DESCENDENT_NEEDS_REFLOW; -} - -static void -do_reflow (ECanvas *canvas) -{ - if (GNOME_CANVAS(canvas)->root->object.flags & E_CANVAS_ITEM_DESCENDENT_NEEDS_REFLOW) - e_canvas_item_invoke_reflow (GNOME_CANVAS(canvas)->root, 0); -} - -/* Idle handler for the e-canvas. It deals with pending reflows. */ -static gint -idle_handler (gpointer data) -{ - ECanvas *canvas; - - GDK_THREADS_ENTER(); - - canvas = E_CANVAS (data); - do_reflow (canvas); - - /* Reset idle id */ - canvas->idle_id = 0; - - gtk_signal_emit (GTK_OBJECT (canvas), - e_canvas_signals [REFLOW]); - - GDK_THREADS_LEAVE(); - - return FALSE; -} - -/* Convenience function to add an idle handler to a canvas */ -static void -add_idle (ECanvas *canvas) -{ - if (canvas->idle_id != 0) - return; - - canvas->idle_id = g_idle_add_full (G_PRIORITY_HIGH_IDLE, idle_handler, (gpointer) canvas, NULL); -} - -static void -e_canvas_item_descendent_needs_reflow (GnomeCanvasItem *item) -{ - if (item->object.flags & E_CANVAS_ITEM_DESCENDENT_NEEDS_REFLOW) - return; - - item->object.flags |= E_CANVAS_ITEM_DESCENDENT_NEEDS_REFLOW; - if (item->parent) - e_canvas_item_descendent_needs_reflow(item->parent); -} - -void -e_canvas_item_request_reflow (GnomeCanvasItem *item) -{ - if (item->object.flags & GNOME_CANVAS_ITEM_REALIZED) { - item->object.flags |= E_CANVAS_ITEM_NEEDS_REFLOW; - e_canvas_item_descendent_needs_reflow(item); - add_idle(E_CANVAS(item->canvas)); - } -} - -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); -} - -void -e_canvas_item_set_reflow_callback (GnomeCanvasItem *item, ECanvasItemReflowFunc func) -{ - gtk_object_set_data(GTK_OBJECT(item), "ECanvasItem::reflow_callback", (gpointer) func); -} |