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/*
* tkCanvas.h --
*
* Declarations shared among all the files that implement canvas widgets.
*
* Copyright (c) 1991-1994 The Regents of the University of California.
* Copyright (c) 1994-1995 Sun Microsystems, Inc.
* Copyright (c) 1998 by Scriptics Corporation.
*
* See the file "license.terms" for information on usage and redistribution of
* this file, and for a DISCLAIMER OF ALL WARRANTIES.
*/
#ifndef _TKCANVAS
#define _TKCANVAS
#ifndef _TK
#include "tk.h"
#endif
#ifndef USE_OLD_TAG_SEARCH
typedef struct TagSearchExpr_s TagSearchExpr;
struct TagSearchExpr_s {
TagSearchExpr *next; /* For linked lists of expressions - used in
* bindings. */
Tk_Uid uid; /* The uid of the whole expression. */
Tk_Uid *uids; /* Expresion compiled to an array of uids. */
int allocated; /* Available space for array of uids. */
int length; /* Length of expression. */
int index; /* Current position in expression
* evaluation. */
int match; /* This expression matches event's item's
* tags. */
};
#endif /* not USE_OLD_TAG_SEARCH */
/*
* The record below describes a canvas widget. It is made available to the
* item functions so they can access certain shared fields such as the overall
* displacement and scale factor for the canvas.
*/
typedef struct TkCanvas {
Tk_Window tkwin; /* Window that embodies the canvas. NULL means
* that the window has been destroyed but the
* data structures haven't yet been cleaned
* up.*/
Display *display; /* Display containing widget; needed, among
* other things, to release resources after
* tkwin has already gone away. */
Tcl_Interp *interp; /* Interpreter associated with canvas. */
Tcl_Command widgetCmd; /* Token for canvas's widget command. */
Tk_Item *firstItemPtr; /* First in list of all items in canvas, or
* NULL if canvas empty. */
Tk_Item *lastItemPtr; /* Last in list of all items in canvas, or
* NULL if canvas empty. */
/*
* Information used when displaying widget:
*/
int borderWidth; /* Width of 3-D border around window. */
Tk_3DBorder bgBorder; /* Used for canvas background. */
int relief; /* Indicates whether window as a whole is
* raised, sunken, or flat. */
int highlightWidth; /* Width in pixels of highlight to draw around
* widget when it has the focus. <= 0 means
* don't draw a highlight. */
XColor *highlightBgColorPtr;
/* Color for drawing traversal highlight area
* when highlight is off. */
XColor *highlightColorPtr; /* Color for drawing traversal highlight. */
int inset; /* Total width of all borders, including
* traversal highlight and 3-D border.
* Indicates how much interior stuff must be
* offset from outside edges to leave room for
* borders. */
GC pixmapGC; /* Used to copy bits from a pixmap to the
* screen and also to clear the pixmap. */
int width, height; /* Dimensions to request for canvas window,
* specified in pixels. */
int redrawX1, redrawY1; /* Upper left corner of area to redraw, in
* pixel coordinates. Border pixels are
* included. Only valid if REDRAW_PENDING flag
* is set. */
int redrawX2, redrawY2; /* Lower right corner of area to redraw, in
* integer canvas coordinates. Border pixels
* will *not* be redrawn. */
int confine; /* Non-zero means constrain view to keep as
* much of canvas visible as possible. */
/*
* Information used to manage the selection and insertion cursor:
*/
Tk_CanvasTextInfo textInfo; /* Contains lots of fields; see tk.h for
* details. This structure is shared with the
* code that implements individual items. */
int insertOnTime; /* Number of milliseconds cursor should spend
* in "on" state for each blink. */
int insertOffTime; /* Number of milliseconds cursor should spend
* in "off" state for each blink. */
Tcl_TimerToken insertBlinkHandler;
/* Timer handler used to blink cursor on and
* off. */
/*
* Transformation applied to canvas as a whole: to compute screen
* coordinates (X,Y) from canvas coordinates (x,y), do the following:
*
* X = x - xOrigin;
* Y = y - yOrigin;
*/
int xOrigin, yOrigin; /* Canvas coordinates corresponding to
* upper-left corner of window, given in
* canvas pixel units. */
int drawableXOrigin, drawableYOrigin;
/* During redisplay, these fields give the
* canvas coordinates corresponding to the
* upper-left corner of the drawable where
* items are actually being drawn (typically a
* pixmap smaller than the whole window). */
/*
* Information used for event bindings associated with items.
*/
Tk_BindingTable bindingTable;
/* Table of all bindings currently defined for
* this canvas. NULL means that no bindings
* exist, so the table hasn't been created.
* Each "object" used for this table is either
* a Tk_Uid for a tag or the address of an
* item named by id. */
Tk_Item *currentItemPtr; /* The item currently containing the mouse
* pointer, or NULL if none. */
Tk_Item *newCurrentPtr; /* The item that is about to become the
* current one, or NULL. This field is used to
* detect deletions of the new current item
* pointer that occur during Leave processing
* of the previous current item. */
double closeEnough; /* The mouse is assumed to be inside an item
* if it is this close to it. */
XEvent pickEvent; /* The event upon which the current choice of
* currentItem is based. Must be saved so that
* if the currentItem is deleted, can pick
* another. */
int state; /* Last known modifier state. Used to defer
* picking a new current object while buttons
* are down. */
/*
* Information used for managing scrollbars:
*/
char *xScrollCmd; /* Command prefix for communicating with
* horizontal scrollbar. NULL means no
* horizontal scrollbar. Malloc'ed. */
char *yScrollCmd; /* Command prefix for communicating with
* vertical scrollbar. NULL means no vertical
* scrollbar. Malloc'ed. */
int scrollX1, scrollY1, scrollX2, scrollY2;
/* These four coordinates define the region
* that is the 100% area for scrolling (i.e.
* these numbers determine the size and
* location of the sliders on scrollbars).
* Units are pixels in canvas coords. */
char *regionString; /* The option string from which scrollX1 etc.
* are derived. Malloc'ed. */
int xScrollIncrement; /* If >0, defines a grid for horizontal
* scrolling. This is the size of the "unit",
* and the left edge of the screen will always
* lie on an even unit boundary. */
int yScrollIncrement; /* If >0, defines a grid for horizontal
* scrolling. This is the size of the "unit",
* and the left edge of the screen will always
* lie on an even unit boundary. */
/*
* Information used for scanning:
*/
int scanX; /* X-position at which scan started (e.g.
* button was pressed here). */
int scanXOrigin; /* Value of xOrigin field when scan started. */
int scanY; /* Y-position at which scan started (e.g.
* button was pressed here). */
int scanYOrigin; /* Value of yOrigin field when scan started. */
/*
* Information used to speed up searches by remembering the last item
* created or found with an item id search.
*/
Tk_Item *hotPtr; /* Pointer to "hot" item (one that's been
* recently used. NULL means there's no hot
* item. */
Tk_Item *hotPrevPtr; /* Pointer to predecessor to hotPtr (NULL
* means item is first in list). This is only
* a hint and may not really be hotPtr's
* predecessor. */
/*
* Miscellaneous information:
*/
Tk_Cursor cursor; /* Current cursor for window, or None. */
char *takeFocus; /* Value of -takefocus option; not used in the
* C code, but used by keyboard traversal
* scripts. Malloc'ed, but may be NULL. */
double pixelsPerMM; /* Scale factor between MM and pixels; used
* when converting coordinates. */
int flags; /* Various flags; see below for
* definitions. */
int nextId; /* Number to use as id for next item created
* in widget. */
Tk_PostscriptInfo psInfo; /* Pointer to information used for generating
* Postscript for the canvas. NULL means no
* Postscript is currently being generated. */
Tcl_HashTable idTable; /* Table of integer indices. */
/*
* Additional information, added by the 'dash'-patch
*/
void *reserved1;
Tk_State canvas_state; /* State of canvas. */
void *reserved2;
void *reserved3;
Tk_TSOffset tsoffset;
#ifndef USE_OLD_TAG_SEARCH
TagSearchExpr *bindTagExprs;/* Linked list of tag expressions used in
* bindings. */
#endif
} TkCanvas;
/*
* Flag bits for canvases:
*
* REDRAW_PENDING - 1 means a DoWhenIdle handler has already been
* created to redraw some or all of the canvas.
* REDRAW_BORDERS - 1 means that the borders need to be redrawn
* during the next redisplay operation.
* REPICK_NEEDED - 1 means DisplayCanvas should pick a new
* current item before redrawing the canvas.
* GOT_FOCUS - 1 means the focus is currently in this widget,
* so should draw the insertion cursor and
* traversal highlight.
* CURSOR_ON - 1 means the insertion cursor is in the "on"
* phase of its blink cycle. 0 means either we
* don't have the focus or the cursor is in the
* "off" phase of its cycle.
* UPDATE_SCROLLBARS - 1 means the scrollbars should get updated as
* part of the next display operation.
* LEFT_GRABBED_ITEM - 1 means that the mouse left the current item
* while a grab was in effect, so we didn't
* change canvasPtr->currentItemPtr.
* REPICK_IN_PROGRESS - 1 means PickCurrentItem is currently
* executing. If it should be called recursively,
* it should simply return immediately.
* BBOX_NOT_EMPTY - 1 means that the bounding box of the area that
* should be redrawn is not empty.
*/
#define REDRAW_PENDING 1
#define REDRAW_BORDERS 2
#define REPICK_NEEDED 4
#define GOT_FOCUS 8
#define CURSOR_ON 0x10
#define UPDATE_SCROLLBARS 0x20
#define LEFT_GRABBED_ITEM 0x40
#define REPICK_IN_PROGRESS 0x100
#define BBOX_NOT_EMPTY 0x200
/*
* Flag bits for canvas items (redraw_flags):
*
* FORCE_REDRAW - 1 means that the new coordinates of some item
* are not yet registered using
* Tk_CanvasEventuallyRedraw(). It should still
* be done by the general canvas code.
*/
#define FORCE_REDRAW 8
/*
* Canvas-related functions that are shared among Tk modules but not exported
* to the outside world:
*/
MODULE_SCOPE int TkCanvPostscriptCmd(TkCanvas *canvasPtr,
Tcl_Interp *interp, int argc, const char **argv);
MODULE_SCOPE int TkCanvTranslatePath(TkCanvas *canvPtr,
int numVertex, double *coordPtr, int closed,
XPoint *outPtr);
/*
* Standard item types provided by Tk:
*/
MODULE_SCOPE Tk_ItemType tkArcType, tkBitmapType, tkImageType, tkLineType;
MODULE_SCOPE Tk_ItemType tkOvalType, tkPolygonType;
MODULE_SCOPE Tk_ItemType tkRectangleType, tkTextType, tkWindowType;
/*
* Convenience macro.
*/
#define Canvas(canvas) ((TkCanvas *) (canvas))
#endif /* _TKCANVAS */
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