/* -*- Mode: C; tab-width: 8; indent-tabs-mode: 8; c-basic-offset: 8 -*- */ /* * Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation * All rights reserved. * * This file is part of the Mate Library. * * The Mate Library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public License as * published by the Free Software Foundation; either version 2 of the * License, or (at your option) any later version. * * The Mate Library 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 * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with the Mate Library; see the file COPYING.LIB. If not, * write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ /* @NOTATION@ */ /* EelCanvas widget - Tk-like canvas widget for Mate * * EelCanvas is basically a port of the Tk toolkit's most excellent canvas * widget. Tk is copyrighted by the Regents of the University of California, * Sun Microsystems, and other parties. * * * Authors: Federico Mena <federico@nuclecu.unam.mx> * Raph Levien <raph@gimp.org> */ #ifndef EEL_CANVAS_H #define EEL_CANVAS_H #include <gtk/gtk.h> #include <gdk/gdk.h> #include <stdarg.h> #ifdef __cplusplus extern "C" { #endif /* "Small" value used by canvas stuff */ #define EEL_CANVAS_EPSILON 1e-10 /* Macros for building colors that fit in a 32-bit integer. The values are in * [0, 255]. */ #define EEL_CANVAS_COLOR(r, g, b) ((((int) (r) & 0xff) << 24) \ | (((int) (g) & 0xff) << 16) \ | (((int) (b) & 0xff) << 8) \ | 0xff) #define EEL_CANVAS_COLOR_A(r, g, b, a) ((((int) (r) & 0xff) << 24) \ | (((int) (g) & 0xff) << 16) \ | (((int) (b) & 0xff) << 8) \ | ((int) (a) & 0xff)) typedef struct _EelCanvas EelCanvas; typedef struct _EelCanvasClass EelCanvasClass; typedef struct _EelCanvasItem EelCanvasItem; typedef struct _EelCanvasItemClass EelCanvasItemClass; typedef struct _EelCanvasGroup EelCanvasGroup; typedef struct _EelCanvasGroupClass EelCanvasGroupClass; /* EelCanvasItem - base item class for canvas items * * All canvas items are derived from EelCanvasItem. The only information a * EelCanvasItem contains is its parent canvas, its parent canvas item group, * and its bounding box in world coordinates. * * Items inside a canvas are organized in a tree of EelCanvasItemGroup nodes * and EelCanvasItem leaves. Each canvas has a single root group, which can * be obtained with the eel_canvas_get_root() function. * * The abstract EelCanvasItem class does not have any configurable or * queryable attributes. */ /* Object flags for items */ enum { EEL_CANVAS_ITEM_REALIZED = 1 << 4, EEL_CANVAS_ITEM_MAPPED = 1 << 5, EEL_CANVAS_ITEM_ALWAYS_REDRAW = 1 << 6, EEL_CANVAS_ITEM_VISIBLE = 1 << 7, EEL_CANVAS_ITEM_NEED_UPDATE = 1 << 8, EEL_CANVAS_ITEM_NEED_DEEP_UPDATE = 1 << 9 }; /* Update flags for items */ enum { EEL_CANVAS_UPDATE_REQUESTED = 1 << 0, EEL_CANVAS_UPDATE_DEEP = 1 << 1 }; #define EEL_TYPE_CANVAS_ITEM (eel_canvas_item_get_type ()) #define EEL_CANVAS_ITEM(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), EEL_TYPE_CANVAS_ITEM, EelCanvasItem)) #define EEL_CANVAS_ITEM_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), EEL_TYPE_CANVAS_ITEM, EelCanvasItemClass)) #define EEL_IS_CANVAS_ITEM(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), EEL_TYPE_CANVAS_ITEM)) #define EEL_IS_CANVAS_ITEM_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), EEL_TYPE_CANVAS_ITEM)) #define EEL_CANVAS_ITEM_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), EEL_TYPE_CANVAS_ITEM, EelCanvasItemClass)) struct _EelCanvasItem { GtkObject object; /* Parent canvas for this item */ EelCanvas *canvas; /* Parent canvas group for this item (a EelCanvasGroup) */ EelCanvasItem *parent; /* Bounding box for this item (in canvas coordinates) */ double x1, y1, x2, y2; /* Object flags */ guint flags; }; struct _EelCanvasItemClass { GtkObjectClass parent_class; /* Tell the item to update itself. The flags are from the update flags * defined above. The item should update its internal state from its * queued state, and recompute and request its repaint area. The * update method also recomputes the bounding box of the item. */ void (* update) (EelCanvasItem *item, double i2w_dx, double i2w_dy, int flags); /* Realize an item -- create GCs, etc. */ void (* realize) (EelCanvasItem *item); /* Unrealize an item */ void (* unrealize) (EelCanvasItem *item); /* Map an item - normally only need by items with their own GdkWindows */ void (* map) (EelCanvasItem *item); /* Unmap an item */ void (* unmap) (EelCanvasItem *item); /* Draw an item of this type. (x, y) are the upper-left canvas pixel * coordinates of the drawable, a temporary pixmap, where things get * drawn. (width, height) are the dimensions of the drawable. */ void (* draw) (EelCanvasItem *item, GdkDrawable *drawable, GdkEventExpose *expose); /* Calculate the distance from an item to the specified point. It also * returns a canvas item which is the item itself in the case of the * object being an actual leaf item, or a child in case of the object * being a canvas group. (cx, cy) are the canvas pixel coordinates that * correspond to the item-relative coordinates (x, y). */ double (* point) (EelCanvasItem *item, double x, double y, int cx, int cy, EelCanvasItem **actual_item); void (* translate) (EelCanvasItem *item, double dx, double dy); /* Fetch the item's bounding box (need not be exactly tight). This * should be in item-relative coordinates. */ void (* bounds) (EelCanvasItem *item, double *x1, double *y1, double *x2, double *y2); /* Signal: an event ocurred for an item of this type. The (x, y) * coordinates are in the canvas world coordinate system. */ gboolean (* event) (EelCanvasItem *item, GdkEvent *event); /* Reserved for future expansion */ gpointer spare_vmethods [4]; }; /* Standard Gtk function */ GType eel_canvas_item_get_type (void) G_GNUC_CONST; /* Create a canvas item using the standard Gtk argument mechanism. The item is * automatically inserted at the top of the specified canvas group. The last * argument must be a NULL pointer. */ EelCanvasItem *eel_canvas_item_new (EelCanvasGroup *parent, GType type, const gchar *first_arg_name, ...); /* Constructors for use in derived classes and language wrappers */ void eel_canvas_item_construct (EelCanvasItem *item, EelCanvasGroup *parent, const gchar *first_arg_name, va_list args); /* Configure an item using the standard Gtk argument mechanism. The last * argument must be a NULL pointer. */ void eel_canvas_item_set (EelCanvasItem *item, const gchar *first_arg_name, ...); /* Used only for language wrappers and the like */ void eel_canvas_item_set_valist (EelCanvasItem *item, const gchar *first_arg_name, va_list args); /* Move an item by the specified amount */ void eel_canvas_item_move (EelCanvasItem *item, double dx, double dy); /* Raise an item in the z-order of its parent group by the specified number of * positions. */ void eel_canvas_item_raise (EelCanvasItem *item, int positions); /* Lower an item in the z-order of its parent group by the specified number of * positions. */ void eel_canvas_item_lower (EelCanvasItem *item, int positions); /* Raise an item to the top of its parent group's z-order. */ void eel_canvas_item_raise_to_top (EelCanvasItem *item); /* Lower an item to the bottom of its parent group's z-order */ void eel_canvas_item_lower_to_bottom (EelCanvasItem *item); /* Send an item behind another item */ void eel_canvas_item_send_behind (EelCanvasItem *item, EelCanvasItem *behind_item); /* Show an item (make it visible). If the item is already shown, it has no * effect. */ void eel_canvas_item_show (EelCanvasItem *item); /* Hide an item (make it invisible). If the item is already invisible, it has * no effect. */ void eel_canvas_item_hide (EelCanvasItem *item); /* Grab the mouse for the specified item. Only the events in event_mask will be * reported. If cursor is non-NULL, it will be used during the duration of the * grab. Time is a proper X event time parameter. Returns the same values as * XGrabPointer(). */ int eel_canvas_item_grab (EelCanvasItem *item, unsigned int event_mask, GdkCursor *cursor, guint32 etime); /* Ungrabs the mouse -- the specified item must be the same that was passed to * eel_canvas_item_grab(). Time is a proper X event time parameter. */ void eel_canvas_item_ungrab (EelCanvasItem *item, guint32 etime); /* These functions convert from a coordinate system to another. "w" is world * coordinates and "i" is item coordinates. */ void eel_canvas_item_w2i (EelCanvasItem *item, double *x, double *y); void eel_canvas_item_i2w (EelCanvasItem *item, double *x, double *y); /* Remove the item from its parent group and make the new group its parent. The * item will be put on top of all the items in the new group. The item's * coordinates relative to its new parent to *not* change -- this means that the * item could potentially move on the screen. * * The item and the group must be in the same canvas. An item cannot be * reparented to a group that is the item itself or that is an inferior of the * item. */ void eel_canvas_item_reparent (EelCanvasItem *item, EelCanvasGroup *new_group); /* Used to send all of the keystroke events to a specific item as well as * GDK_FOCUS_CHANGE events. */ void eel_canvas_item_grab_focus (EelCanvasItem *item); /* Fetch the bounding box of the item. The bounding box may not be exactly * tight, but the canvas items will do the best they can. The returned bounding * box is in the coordinate system of the item's parent. */ void eel_canvas_item_get_bounds (EelCanvasItem *item, double *x1, double *y1, double *x2, double *y2); /* Request that the update method eventually get called. This should be used * only by item implementations. */ void eel_canvas_item_request_update (EelCanvasItem *item); /* Request a redraw of the bounding box of the canvas item */ void eel_canvas_item_request_redraw (EelCanvasItem *item); /* EelCanvasGroup - a group of canvas items * * A group is a node in the hierarchical tree of groups/items inside a canvas. * Groups serve to give a logical structure to the items. * * Consider a circuit editor application that uses the canvas for its schematic * display. Hierarchically, there would be canvas groups that contain all the * components needed for an "adder", for example -- this includes some logic * gates as well as wires. You can move stuff around in a convenient way by * doing a eel_canvas_item_move() of the hierarchical groups -- to move an * adder, simply move the group that represents the adder. * * The following arguments are available: * * name type read/write description * -------------------------------------------------------------------------------- * x double RW X coordinate of group's origin * y double RW Y coordinate of group's origin */ #define EEL_TYPE_CANVAS_GROUP (eel_canvas_group_get_type ()) #define EEL_CANVAS_GROUP(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), EEL_TYPE_CANVAS_GROUP, EelCanvasGroup)) #define EEL_CANVAS_GROUP_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), EEL_TYPE_CANVAS_GROUP, EelCanvasGroupClass)) #define EEL_IS_CANVAS_GROUP(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), EEL_TYPE_CANVAS_GROUP)) #define EEL_IS_CANVAS_GROUP_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), EEL_TYPE_CANVAS_GROUP)) #define EEL_CANVAS_GROUP_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), EEL_TYPE_CANVAS_GROUP, EelCanvasGroupClass)) struct _EelCanvasGroup { EelCanvasItem item; double xpos, ypos; /* Children of the group */ GList *item_list; GList *item_list_end; }; struct _EelCanvasGroupClass { EelCanvasItemClass parent_class; }; /* Standard Gtk function */ GType eel_canvas_group_get_type (void) G_GNUC_CONST; /*** EelCanvas ***/ #define EEL_TYPE_CANVAS (eel_canvas_get_type ()) #define EEL_CANVAS(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), EEL_TYPE_CANVAS, EelCanvas)) #define EEL_CANVAS_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), EEL_TYPE_CANVAS, EelCanvasClass)) #define EEL_IS_CANVAS(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), EEL_TYPE_CANVAS)) #define EEL_IS_CANVAS_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), EEL_TYPE_CANVAS)) #define EEL_CANVAS_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), EEL_TYPE_CANVAS, EelCanvasClass)) struct _EelCanvas { GtkLayout layout; /* Root canvas group */ EelCanvasItem *root; /* The item containing the mouse pointer, or NULL if none */ EelCanvasItem *current_item; /* Item that is about to become current (used to track deletions and such) */ EelCanvasItem *new_current_item; /* Item that holds a pointer grab, or NULL if none */ EelCanvasItem *grabbed_item; /* If non-NULL, the currently focused item */ EelCanvasItem *focused_item; /* GC for temporary draw pixmap */ GdkGC *pixmap_gc; /* Event on which selection of current item is based */ GdkEvent pick_event; /* Scrolling region */ double scroll_x1, scroll_y1; double scroll_x2, scroll_y2; /* Scaling factor to be used for display */ double pixels_per_unit; /* Idle handler ID */ guint idle_id; /* Signal handler ID for destruction of the root item */ guint root_destroy_id; /* Internal pixel offsets when zoomed out */ int zoom_xofs, zoom_yofs; /* Last known modifier state, for deferred repick when a button is down */ int state; /* Event mask specified when grabbing an item */ guint grabbed_event_mask; /* Tolerance distance for picking items */ int close_enough; /* Whether the canvas should center the canvas in the middle of * the window if the scroll region is smaller than the window */ unsigned int center_scroll_region : 1; /* Whether items need update at next idle loop iteration */ unsigned int need_update : 1; /* Are we in the midst of an update */ unsigned int doing_update : 1; /* Whether the canvas needs redrawing at the next idle loop iteration */ unsigned int need_redraw : 1; /* Whether current item will be repicked at next idle loop iteration */ unsigned int need_repick : 1; /* For use by internal pick_current_item() function */ unsigned int left_grabbed_item : 1; /* For use by internal pick_current_item() function */ unsigned int in_repick : 1; }; struct _EelCanvasClass { GtkLayoutClass parent_class; /* Draw the background for the area given. */ void (* draw_background) (EelCanvas *canvas, int x, int y, int width, int height); /* Private Virtual methods for groping the canvas inside matecomponent */ void (* request_update) (EelCanvas *canvas); /* Reserved for future expansion */ gpointer spare_vmethods [4]; }; /* Standard Gtk function */ GType eel_canvas_get_type (void) G_GNUC_CONST; /* Creates a new canvas. You should check that the canvas is created with the * proper visual and colormap. Any visual will do unless you intend to insert * gdk_imlib images into it, in which case you should use the gdk_imlib visual. * * You should call eel_canvas_set_scroll_region() soon after calling this * function to set the desired scrolling limits for the canvas. */ GtkWidget *eel_canvas_new (void); /* Returns the root canvas item group of the canvas */ EelCanvasGroup *eel_canvas_root (EelCanvas *canvas); /* Sets the limits of the scrolling region, in world coordinates */ void eel_canvas_set_scroll_region (EelCanvas *canvas, double x1, double y1, double x2, double y2); /* Gets the limits of the scrolling region, in world coordinates */ void eel_canvas_get_scroll_region (EelCanvas *canvas, double *x1, double *y1, double *x2, double *y2); /* Sets the number of pixels that correspond to one unit in world coordinates */ void eel_canvas_set_pixels_per_unit (EelCanvas *canvas, double n); /* Wether the canvas centers the scroll region if it is smaller than the window */ void eel_canvas_set_center_scroll_region (EelCanvas *canvas, gboolean center_scroll_region); /* Scrolls the canvas to the specified offsets, given in canvas pixel coordinates */ void eel_canvas_scroll_to (EelCanvas *canvas, int cx, int cy); /* Returns the scroll offsets of the canvas in canvas pixel coordinates. You * can specify NULL for any of the values, in which case that value will not be * queried. */ void eel_canvas_get_scroll_offsets (EelCanvas *canvas, int *cx, int *cy); /* Requests that the canvas be repainted immediately instead of in the idle * loop. */ void eel_canvas_update_now (EelCanvas *canvas); /* Returns the item that is at the specified position in world coordinates, or * NULL if no item is there. */ EelCanvasItem *eel_canvas_get_item_at (EelCanvas *canvas, double x, double y); /* For use only by item type implementations. Request that the canvas * eventually redraw the specified region, specified in canvas pixel * coordinates. The region contains (x1, y1) but not (x2, y2). */ void eel_canvas_request_redraw (EelCanvas *canvas, int x1, int y1, int x2, int y2); /* These functions convert from a coordinate system to another. "w" is world * coordinates, "c" is canvas pixel coordinates (pixel coordinates that are * (0,0) for the upper-left scrolling limit and something else for the * lower-left scrolling limit). */ void eel_canvas_w2c_rect_d (EelCanvas *canvas, double *x1, double *y1, double *x2, double *y2); void eel_canvas_w2c (EelCanvas *canvas, double wx, double wy, int *cx, int *cy); void eel_canvas_w2c_d (EelCanvas *canvas, double wx, double wy, double *cx, double *cy); void eel_canvas_c2w (EelCanvas *canvas, int cx, int cy, double *wx, double *wy); /* This function takes in coordinates relative to the GTK_LAYOUT * (canvas)->bin_window and converts them to world coordinates. * These days canvas coordinates and window coordinates are the same, but * these are left for backwards compat reasons. */ void eel_canvas_window_to_world (EelCanvas *canvas, double winx, double winy, double *worldx, double *worldy); /* This is the inverse of eel_canvas_window_to_world() */ void eel_canvas_world_to_window (EelCanvas *canvas, double worldx, double worldy, double *winx, double *winy); /* Takes a string specification for a color and allocates it into the specified * GdkColor. If the string is null, then it returns FALSE. Otherwise, it * returns TRUE. */ int eel_canvas_get_color (EelCanvas *canvas, const char *spec, GdkColor *color); /* Allocates a color from the RGB value passed into this function. */ gulong eel_canvas_get_color_pixel (EelCanvas *canvas, guint rgba); /* Sets the stipple origin of the specified gc so that it will be aligned with * all the stipples used in the specified canvas. This is intended for use only * by canvas item implementations. */ void eel_canvas_set_stipple_origin (EelCanvas *canvas, GdkGC *gc); #ifdef __cplusplus } #endif #endif