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![Alexandru Fazakas](/assets/img/avatar_default.png)
The traditional include guards are not as easy to handle and require extra thought into the names. Pragma once is an easier, more contributor friendly approach. Closes https://gitlab.gnome.org/GNOME/nautilus/issues/294 general: Remove include guards in favor of pragma once The traditional include guards are not as easy to handle and require extra thought into the names. Pragma once is an easier, more contributor friendly approach. Closes https://gitlab.gnome.org/GNOME/nautilus/issues/294
497 lines
17 KiB
C
497 lines
17 KiB
C
/*
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* Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation
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* All rights reserved.
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*
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* This file is part of the Gnome Library.
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*
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* The Gnome Library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* The Gnome Library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with the Gnome Library; see the file COPYING.LIB. If not,
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* see <http://www.gnu.org/licenses/>.
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*/
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/*
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@NOTATION@
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*/
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/* EelCanvas widget - Tk-like canvas widget for Gnome
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*
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* EelCanvas is basically a port of the Tk toolkit's most excellent canvas
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* widget. Tk is copyrighted by the Regents of the University of California,
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* Sun Microsystems, and other parties.
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*
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*
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* Authors: Federico Mena <federico@nuclecu.unam.mx>
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* Raph Levien <raph@gimp.org>
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*/
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#pragma once
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#include <gtk/gtk.h>
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#include <gtk/gtk-a11y.h>
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#include <gdk/gdk.h>
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#include <stdarg.h>
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G_BEGIN_DECLS
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/* "Small" value used by canvas stuff */
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#define EEL_CANVAS_EPSILON 1e-10
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/* Macros for building colors that fit in a 32-bit integer. The values are in
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* [0, 255].
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*/
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#define EEL_CANVAS_COLOR(r, g, b) ((((int) (r) & 0xff) << 24) \
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| (((int) (g) & 0xff) << 16) \
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| (((int) (b) & 0xff) << 8) \
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| 0xff)
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#define EEL_CANVAS_COLOR_A(r, g, b, a) ((((int) (r) & 0xff) << 24) \
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| (((int) (g) & 0xff) << 16) \
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| (((int) (b) & 0xff) << 8) \
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| ((int) (a) & 0xff))
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typedef struct _EelCanvas EelCanvas;
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typedef struct _EelCanvasClass EelCanvasClass;
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typedef struct _EelCanvasItem EelCanvasItem;
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typedef struct _EelCanvasItemClass EelCanvasItemClass;
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typedef struct _EelCanvasGroup EelCanvasGroup;
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typedef struct _EelCanvasGroupClass EelCanvasGroupClass;
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/* EelCanvasItem - base item class for canvas items
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*
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* All canvas items are derived from EelCanvasItem. The only information a
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* EelCanvasItem contains is its parent canvas, its parent canvas item group,
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* and its bounding box in world coordinates.
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*
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* Items inside a canvas are organized in a tree of EelCanvasItemGroup nodes
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* and EelCanvasItem leaves. Each canvas has a single root group, which can
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* be obtained with the eel_canvas_get_root() function.
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*
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* The abstract EelCanvasItem class does not have any configurable or
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* queryable attributes.
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*/
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/* Object flags for items */
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enum {
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EEL_CANVAS_ITEM_REALIZED = 1 << 4,
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EEL_CANVAS_ITEM_MAPPED = 1 << 5,
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EEL_CANVAS_ITEM_ALWAYS_REDRAW = 1 << 6,
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EEL_CANVAS_ITEM_VISIBLE = 1 << 7,
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EEL_CANVAS_ITEM_NEED_UPDATE = 1 << 8,
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EEL_CANVAS_ITEM_NEED_DEEP_UPDATE = 1 << 9
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};
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/* Update flags for items */
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enum {
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EEL_CANVAS_UPDATE_REQUESTED = 1 << 0,
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EEL_CANVAS_UPDATE_DEEP = 1 << 1
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};
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#define EEL_TYPE_CANVAS_ITEM (eel_canvas_item_get_type ())
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#define EEL_CANVAS_ITEM(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), EEL_TYPE_CANVAS_ITEM, EelCanvasItem))
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#define EEL_CANVAS_ITEM_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), EEL_TYPE_CANVAS_ITEM, EelCanvasItemClass))
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#define EEL_IS_CANVAS_ITEM(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), EEL_TYPE_CANVAS_ITEM))
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#define EEL_IS_CANVAS_ITEM_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), EEL_TYPE_CANVAS_ITEM))
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#define EEL_CANVAS_ITEM_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), EEL_TYPE_CANVAS_ITEM, EelCanvasItemClass))
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struct _EelCanvasItem {
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GInitiallyUnowned object;
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/* Parent canvas for this item */
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EelCanvas *canvas;
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/* Parent canvas group for this item (a EelCanvasGroup) */
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EelCanvasItem *parent;
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/* Bounding box for this item (in canvas coordinates) */
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double x1, y1, x2, y2;
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/* Object flags */
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guint flags;
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};
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struct _EelCanvasItemClass {
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GInitiallyUnownedClass parent_class;
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void (* destroy) (EelCanvasItem *item);
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/* Tell the item to update itself. The flags are from the update flags
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* defined above. The item should update its internal state from its
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* queued state, and recompute and request its repaint area. The
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* update method also recomputes the bounding box of the item.
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*/
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void (* update) (EelCanvasItem *item, double i2w_dx, double i2w_dy, int flags);
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/* Realize an item -- create GCs, etc. */
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void (* realize) (EelCanvasItem *item);
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/* Unrealize an item */
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void (* unrealize) (EelCanvasItem *item);
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/* Map an item - normally only need by items with their own GdkWindows */
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void (* map) (EelCanvasItem *item);
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/* Unmap an item */
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void (* unmap) (EelCanvasItem *item);
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/* Draw an item of this type. (x, y) are the upper-left canvas pixel
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* coordinates of the drawable, a temporary pixmap, where things get
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* drawn. (width, height) are the dimensions of the drawable.
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*/
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void (* draw) (EelCanvasItem *item, cairo_t *cr, cairo_region_t *region);
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/* Calculate the distance from an item to the specified point. It also
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* returns a canvas item which is the item itself in the case of the
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* object being an actual leaf item, or a child in case of the object
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* being a canvas group. (cx, cy) are the canvas pixel coordinates that
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* correspond to the item-relative coordinates (x, y).
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*/
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double (* point) (EelCanvasItem *item, double x, double y, int cx, int cy,
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EelCanvasItem **actual_item);
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void (* translate) (EelCanvasItem *item, double dx, double dy);
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/* Fetch the item's bounding box (need not be exactly tight). This
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* should be in item-relative coordinates.
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*/
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void (* bounds) (EelCanvasItem *item, double *x1, double *y1, double *x2, double *y2);
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/* Signal: an event ocurred for an item of this type. The (x, y)
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* coordinates are in the canvas world coordinate system.
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*/
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gboolean (* event) (EelCanvasItem *item, GdkEvent *event);
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/* Reserved for future expansion */
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gpointer spare_vmethods [4];
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};
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/* Standard Gtk function */
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GType eel_canvas_item_get_type (void) G_GNUC_CONST;
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/* Create a canvas item using the standard Gtk argument mechanism. The item is
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* automatically inserted at the top of the specified canvas group. The last
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* argument must be a NULL pointer.
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*/
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EelCanvasItem *eel_canvas_item_new (EelCanvasGroup *parent, GType type,
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const gchar *first_arg_name, ...);
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void eel_canvas_item_destroy (EelCanvasItem *item);
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/* Configure an item using the standard Gtk argument mechanism. The last
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* argument must be a NULL pointer.
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*/
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void eel_canvas_item_set (EelCanvasItem *item, const gchar *first_arg_name, ...);
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/* Move an item by the specified amount */
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void eel_canvas_item_move (EelCanvasItem *item, double dx, double dy);
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/* Raise an item in the z-order of its parent group by the specified number of
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* positions.
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*/
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void eel_canvas_item_raise (EelCanvasItem *item, int positions);
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/* Lower an item in the z-order of its parent group by the specified number of
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* positions.
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*/
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void eel_canvas_item_lower (EelCanvasItem *item, int positions);
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/* Raise an item to the top of its parent group's z-order. */
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void eel_canvas_item_raise_to_top (EelCanvasItem *item);
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/* Lower an item to the bottom of its parent group's z-order */
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void eel_canvas_item_lower_to_bottom (EelCanvasItem *item);
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/* Send an item behind another item */
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void eel_canvas_item_send_behind (EelCanvasItem *item,
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EelCanvasItem *behind_item);
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/* Show an item (make it visible). If the item is already shown, it has no
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* effect.
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*/
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void eel_canvas_item_show (EelCanvasItem *item);
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/* Hide an item (make it invisible). If the item is already invisible, it has
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* no effect.
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*/
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void eel_canvas_item_hide (EelCanvasItem *item);
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/* Grab the seat for the specified item. Only the events in event_mask will be
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* reported. If cursor is non-NULL, it will be used during the duration of the
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* grab. event is the event, triggering the grab. Returns the same values as gdk_seat_grab().
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*/
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GdkGrabStatus eel_canvas_item_grab (EelCanvasItem *item,
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GdkEventMask event_mask,
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GdkCursor *cursor,
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const GdkEvent* event);
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/* Ungrabs the seat -- the specified item must be the same that was passed to
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* eel_canvas_item_grab().
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*/
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void eel_canvas_item_ungrab (EelCanvasItem *item);
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/* These functions convert from a coordinate system to another. "w" is world
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* coordinates and "i" is item coordinates.
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*/
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void eel_canvas_item_i2w (EelCanvasItem *item, double *x, double *y);
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/* Fetch the bounding box of the item. The bounding box may not be exactly
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* tight, but the canvas items will do the best they can. The returned bounding
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* box is in the coordinate system of the item's parent.
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*/
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void eel_canvas_item_get_bounds (EelCanvasItem *item,
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double *x1, double *y1, double *x2, double *y2);
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/* Request that the update method eventually get called. This should be used
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* only by item implementations.
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*/
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void eel_canvas_item_request_update (EelCanvasItem *item);
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/* Request a redraw of the bounding box of the canvas item */
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void eel_canvas_item_request_redraw (EelCanvasItem *item);
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/* EelCanvasGroup - a group of canvas items
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*
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* A group is a node in the hierarchical tree of groups/items inside a canvas.
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* Groups serve to give a logical structure to the items.
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*
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* Consider a circuit editor application that uses the canvas for its schematic
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* display. Hierarchically, there would be canvas groups that contain all the
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* components needed for an "adder", for example -- this includes some logic
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* gates as well as wires. You can move stuff around in a convenient way by
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* doing a eel_canvas_item_move() of the hierarchical groups -- to move an
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* adder, simply move the group that represents the adder.
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*
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* The following arguments are available:
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*
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* name type read/write description
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* --------------------------------------------------------------------------------
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* x double RW X coordinate of group's origin
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* y double RW Y coordinate of group's origin
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*/
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#define EEL_TYPE_CANVAS_GROUP (eel_canvas_group_get_type ())
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#define EEL_CANVAS_GROUP(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), EEL_TYPE_CANVAS_GROUP, EelCanvasGroup))
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#define EEL_CANVAS_GROUP_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), EEL_TYPE_CANVAS_GROUP, EelCanvasGroupClass))
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#define EEL_IS_CANVAS_GROUP(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), EEL_TYPE_CANVAS_GROUP))
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#define EEL_IS_CANVAS_GROUP_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), EEL_TYPE_CANVAS_GROUP))
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#define EEL_CANVAS_GROUP_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), EEL_TYPE_CANVAS_GROUP, EelCanvasGroupClass))
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struct _EelCanvasGroup {
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EelCanvasItem item;
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double xpos, ypos;
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/* Children of the group */
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GList *item_list;
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GList *item_list_end;
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};
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struct _EelCanvasGroupClass {
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EelCanvasItemClass parent_class;
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};
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/* Standard Gtk function */
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GType eel_canvas_group_get_type (void) G_GNUC_CONST;
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/*** EelCanvas ***/
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#define EEL_TYPE_CANVAS (eel_canvas_get_type ())
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#define EEL_CANVAS(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), EEL_TYPE_CANVAS, EelCanvas))
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#define EEL_CANVAS_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), EEL_TYPE_CANVAS, EelCanvasClass))
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#define EEL_IS_CANVAS(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), EEL_TYPE_CANVAS))
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#define EEL_IS_CANVAS_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), EEL_TYPE_CANVAS))
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#define EEL_CANVAS_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), EEL_TYPE_CANVAS, EelCanvasClass))
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struct _EelCanvas {
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GtkLayout layout;
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/* Root canvas group */
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EelCanvasItem *root;
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/* The item containing the mouse pointer, or NULL if none */
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EelCanvasItem *current_item;
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/* Item that is about to become current (used to track deletions and such) */
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EelCanvasItem *new_current_item;
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/* Item that holds a pointer grab, or NULL if none */
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EelCanvasItem *grabbed_item;
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/* If non-NULL, the currently focused item */
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EelCanvasItem *focused_item;
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/* Event on which selection of current item is based */
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GdkEvent pick_event;
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/* Scrolling region */
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double scroll_x1, scroll_y1;
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double scroll_x2, scroll_y2;
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/* Scaling factor to be used for display */
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double pixels_per_unit;
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/* Idle handler ID */
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guint idle_id;
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/* Signal handler ID for destruction of the root item */
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guint root_destroy_id;
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/* Internal pixel offsets when zoomed out */
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int zoom_xofs, zoom_yofs;
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/* Last known modifier state, for deferred repick when a button is down */
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int state;
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/* Event mask specified when grabbing an item */
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guint grabbed_event_mask;
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/* Tolerance distance for picking items */
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int close_enough;
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/* Whether the canvas should center the canvas in the middle of
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* the window if the scroll region is smaller than the window */
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unsigned int center_scroll_region : 1;
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/* Whether items need update at next idle loop iteration */
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unsigned int need_update : 1;
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/* Are we in the midst of an update */
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unsigned int doing_update : 1;
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/* Whether the canvas needs redrawing at the next idle loop iteration */
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unsigned int need_redraw : 1;
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/* Whether current item will be repicked at next idle loop iteration */
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unsigned int need_repick : 1;
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/* For use by internal pick_current_item() function */
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unsigned int left_grabbed_item : 1;
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/* For use by internal pick_current_item() function */
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unsigned int in_repick : 1;
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};
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struct _EelCanvasClass {
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GtkLayoutClass parent_class;
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/* Private Virtual methods for groping the canvas inside bonobo */
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void (* request_update) (EelCanvas *canvas);
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/* Reserved for future expansion */
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gpointer spare_vmethods [4];
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};
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/* Standard Gtk function */
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GType eel_canvas_get_type (void) G_GNUC_CONST;
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/* Creates a new canvas. You should check that the canvas is created with the
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* proper visual and colormap. Any visual will do unless you intend to insert
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* gdk_imlib images into it, in which case you should use the gdk_imlib visual.
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*
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* You should call eel_canvas_set_scroll_region() soon after calling this
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* function to set the desired scrolling limits for the canvas.
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*/
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GtkWidget *eel_canvas_new (void);
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/* Returns the root canvas item group of the canvas */
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EelCanvasGroup *eel_canvas_root (EelCanvas *canvas);
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/* Sets the limits of the scrolling region, in world coordinates */
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void eel_canvas_set_scroll_region (EelCanvas *canvas,
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double x1, double y1, double x2, double y2);
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/* Gets the limits of the scrolling region, in world coordinates */
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void eel_canvas_get_scroll_region (EelCanvas *canvas,
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double *x1, double *y1, double *x2, double *y2);
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/* Sets the number of pixels that correspond to one unit in world coordinates */
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void eel_canvas_set_pixels_per_unit (EelCanvas *canvas, double n);
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/* Returns the scroll offsets of the canvas in canvas pixel coordinates. You
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* can specify NULL for any of the values, in which case that value will not be
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* queried.
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*/
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void eel_canvas_get_scroll_offsets (EelCanvas *canvas, int *cx, int *cy);
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/* For use only by item type implementations. Request that the canvas
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* eventually redraw the specified region, specified in canvas pixel
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* coordinates. The region contains (x1, y1) but not (x2, y2).
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*/
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void eel_canvas_request_redraw (EelCanvas *canvas, int x1, int y1, int x2, int y2);
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/* These functions convert from a coordinate system to another. "w" is world
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* coordinates, "c" is canvas pixel coordinates (pixel coordinates that are
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* (0,0) for the upper-left scrolling limit and something else for the
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* lower-left scrolling limit).
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*/
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void eel_canvas_w2c_rect_d (EelCanvas *canvas,
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double *x1, double *y1,
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double *x2, double *y2);
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void eel_canvas_w2c (EelCanvas *canvas, double wx, double wy, int *cx, int *cy);
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void eel_canvas_w2c_d (EelCanvas *canvas, double wx, double wy, double *cx, double *cy);
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void eel_canvas_c2w (EelCanvas *canvas, int cx, int cy, double *wx, double *wy);
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/* This function takes in coordinates relative to the GTK_LAYOUT
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* (canvas)->bin_window and converts them to world coordinates.
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* These days canvas coordinates and window coordinates are the same, but
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* these are left for backwards compat reasons.
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*/
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void eel_canvas_window_to_world (EelCanvas *canvas,
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double winx, double winy, double *worldx, double *worldy);
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|
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/* This is the inverse of eel_canvas_window_to_world() */
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void eel_canvas_world_to_window (EelCanvas *canvas,
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|
double worldx, double worldy, double *winx, double *winy);
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|
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/* Accessible implementation */
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|
GType eel_canvas_accessible_get_type (void);
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|
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typedef struct _EelCanvasAccessible EelCanvasAccessible;
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|
struct _EelCanvasAccessible
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|
{
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|
GtkContainerAccessible parent;
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|
};
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|
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typedef struct _EelCanvasAccessibleClass EelCanvasAccessibleClass;
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|
struct _EelCanvasAccessibleClass
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|
{
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|
GtkContainerAccessibleClass parent_class;
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|
};
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|
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|
GType eel_canvas_item_accessible_get_type (void);
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|
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typedef struct _EelCanvasItemAccessible EelCanvasItemAccessible;
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|
struct _EelCanvasItemAccessible
|
|
{
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|
GtkAccessible parent;
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|
};
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|
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|
typedef struct _EelCanvasItemAccessibleClass EelCanvasItemAccessibleClass;
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|
struct _EelCanvasItemAccessibleClass
|
|
{
|
|
GtkAccessibleClass parent_class;
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|
};
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|
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G_END_DECLS |