path: root/widgets/misc/e-canvas.h

/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) version 3.
 *
 * 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the program; if not, see <http://www.gnu.org/licenses/>
 *
 *
 * Authors:
 *      Chris Lahey <clahey@ximian.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

#ifndef E_CANVAS_H
#define E_CANVAS_H

#include <gtk/gtk.h>
#include <libgnomecanvas/gnome-canvas.h>

/* ECanvas - A class derived from canvas for the purpose of adding
 * 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))

G_BEGIN_DECLS

typedef void    (*ECanvasItemReflowFunc)    (GnomeCanvasItem *item,
                         gint flags);

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 struct _ECanvas ECanvas;
typedef struct _ECanvasClass ECanvasClass;

/* Object flags for items */
enum {
    E_CANVAS_ITEM_NEEDS_REFLOW            = 1 << 13,
    E_CANVAS_ITEM_DESCENDENT_NEEDS_REFLOW = 1 << 14
};

typedef struct {
    GnomeCanvasItem *item;
    gpointer         id;
} ECanvasSelectionInfo;

typedef void    (*ECanvasItemGrabCancelled) (ECanvas *canvas,
                         GnomeCanvasItem *item,
                         gpointer data);

struct _ECanvas {
    GnomeCanvas parent;

    gint idle_id;
    GList *selection;
    ECanvasSelectionInfo *cursor;

    GtkWidget *tooltip_window;
    gint visibility_notify_id;
    GtkWidget *toplevel;

    /* Input context for dead key support */
    GtkIMContext *im_context;

    ECanvasItemGrabCancelled grab_cancelled_cb;
    guint grab_cancelled_check_id;
    guint32 grab_cancelled_time;
    gpointer grab_cancelled_data;
};

struct _ECanvasClass {
    GnomeCanvasClass parent_class;

    void        (*reflow)       (ECanvas *canvas);
};

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);

G_END_DECLS

#endif /* E_CANVAS_H */