Import Tk 8.5.15 (as of svn r89086)
This commit is contained in:
Zachary Ware
306
generic/tkCanvas.h
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306
generic/tkCanvas.h
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/*
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* tkCanvas.h --
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*
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* Declarations shared among all the files that implement canvas widgets.
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*
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* Copyright (c) 1991-1994 The Regents of the University of California.
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* Copyright (c) 1994-1995 Sun Microsystems, Inc.
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* Copyright (c) 1998 by Scriptics Corporation.
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*
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* See the file "license.terms" for information on usage and redistribution of
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* this file, and for a DISCLAIMER OF ALL WARRANTIES.
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*/
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#ifndef _TKCANVAS
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#define _TKCANVAS
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#ifndef _TK
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#include "tk.h"
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#endif
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#ifndef USE_OLD_TAG_SEARCH
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typedef struct TagSearchExpr_s TagSearchExpr;
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struct TagSearchExpr_s {
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TagSearchExpr *next; /* For linked lists of expressions - used in
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* bindings. */
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Tk_Uid uid; /* The uid of the whole expression. */
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Tk_Uid *uids; /* Expresion compiled to an array of uids. */
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int allocated; /* Available space for array of uids. */
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int length; /* Length of expression. */
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int index; /* Current position in expression
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* evaluation. */
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int match; /* This expression matches event's item's
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* tags. */
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};
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#endif /* not USE_OLD_TAG_SEARCH */
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/*
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* The record below describes a canvas widget. It is made available to the
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* item functions so they can access certain shared fields such as the overall
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* displacement and scale factor for the canvas.
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*/
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typedef struct TkCanvas {
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Tk_Window tkwin; /* Window that embodies the canvas. NULL means
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* that the window has been destroyed but the
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* data structures haven't yet been cleaned
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* up.*/
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Display *display; /* Display containing widget; needed, among
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* other things, to release resources after
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* tkwin has already gone away. */
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Tcl_Interp *interp; /* Interpreter associated with canvas. */
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Tcl_Command widgetCmd; /* Token for canvas's widget command. */
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Tk_Item *firstItemPtr; /* First in list of all items in canvas, or
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* NULL if canvas empty. */
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Tk_Item *lastItemPtr; /* Last in list of all items in canvas, or
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* NULL if canvas empty. */
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/*
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* Information used when displaying widget:
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*/
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int borderWidth; /* Width of 3-D border around window. */
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Tk_3DBorder bgBorder; /* Used for canvas background. */
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int relief; /* Indicates whether window as a whole is
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* raised, sunken, or flat. */
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int highlightWidth; /* Width in pixels of highlight to draw around
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* widget when it has the focus. <= 0 means
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* don't draw a highlight. */
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XColor *highlightBgColorPtr;
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/* Color for drawing traversal highlight area
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* when highlight is off. */
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XColor *highlightColorPtr; /* Color for drawing traversal highlight. */
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int inset; /* Total width of all borders, including
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* traversal highlight and 3-D border.
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* Indicates how much interior stuff must be
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* offset from outside edges to leave room for
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* borders. */
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GC pixmapGC; /* Used to copy bits from a pixmap to the
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* screen and also to clear the pixmap. */
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int width, height; /* Dimensions to request for canvas window,
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* specified in pixels. */
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int redrawX1, redrawY1; /* Upper left corner of area to redraw, in
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* pixel coordinates. Border pixels are
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* included. Only valid if REDRAW_PENDING flag
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* is set. */
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int redrawX2, redrawY2; /* Lower right corner of area to redraw, in
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* integer canvas coordinates. Border pixels
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* will *not* be redrawn. */
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int confine; /* Non-zero means constrain view to keep as
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* much of canvas visible as possible. */
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/*
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* Information used to manage the selection and insertion cursor:
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*/
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Tk_CanvasTextInfo textInfo; /* Contains lots of fields; see tk.h for
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* details. This structure is shared with the
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* code that implements individual items. */
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int insertOnTime; /* Number of milliseconds cursor should spend
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* in "on" state for each blink. */
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int insertOffTime; /* Number of milliseconds cursor should spend
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* in "off" state for each blink. */
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Tcl_TimerToken insertBlinkHandler;
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/* Timer handler used to blink cursor on and
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* off. */
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/*
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* Transformation applied to canvas as a whole: to compute screen
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* coordinates (X,Y) from canvas coordinates (x,y), do the following:
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*
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* X = x - xOrigin;
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* Y = y - yOrigin;
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*/
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int xOrigin, yOrigin; /* Canvas coordinates corresponding to
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* upper-left corner of window, given in
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* canvas pixel units. */
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int drawableXOrigin, drawableYOrigin;
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/* During redisplay, these fields give the
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* canvas coordinates corresponding to the
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* upper-left corner of the drawable where
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* items are actually being drawn (typically a
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* pixmap smaller than the whole window). */
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/*
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* Information used for event bindings associated with items.
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*/
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Tk_BindingTable bindingTable;
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/* Table of all bindings currently defined for
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* this canvas. NULL means that no bindings
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* exist, so the table hasn't been created.
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* Each "object" used for this table is either
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* a Tk_Uid for a tag or the address of an
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* item named by id. */
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Tk_Item *currentItemPtr; /* The item currently containing the mouse
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* pointer, or NULL if none. */
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Tk_Item *newCurrentPtr; /* The item that is about to become the
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* current one, or NULL. This field is used to
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* detect deletions of the new current item
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* pointer that occur during Leave processing
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* of the previous current item. */
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double closeEnough; /* The mouse is assumed to be inside an item
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* if it is this close to it. */
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XEvent pickEvent; /* The event upon which the current choice of
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* currentItem is based. Must be saved so that
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* if the currentItem is deleted, can pick
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* another. */
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int state; /* Last known modifier state. Used to defer
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* picking a new current object while buttons
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* are down. */
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/*
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* Information used for managing scrollbars:
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*/
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char *xScrollCmd; /* Command prefix for communicating with
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* horizontal scrollbar. NULL means no
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* horizontal scrollbar. Malloc'ed. */
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char *yScrollCmd; /* Command prefix for communicating with
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* vertical scrollbar. NULL means no vertical
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* scrollbar. Malloc'ed. */
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int scrollX1, scrollY1, scrollX2, scrollY2;
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/* These four coordinates define the region
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* that is the 100% area for scrolling (i.e.
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* these numbers determine the size and
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* location of the sliders on scrollbars).
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* Units are pixels in canvas coords. */
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char *regionString; /* The option string from which scrollX1 etc.
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* are derived. Malloc'ed. */
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int xScrollIncrement; /* If >0, defines a grid for horizontal
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* scrolling. This is the size of the "unit",
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* and the left edge of the screen will always
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* lie on an even unit boundary. */
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int yScrollIncrement; /* If >0, defines a grid for horizontal
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* scrolling. This is the size of the "unit",
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* and the left edge of the screen will always
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* lie on an even unit boundary. */
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/*
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* Information used for scanning:
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*/
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int scanX; /* X-position at which scan started (e.g.
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* button was pressed here). */
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int scanXOrigin; /* Value of xOrigin field when scan started. */
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int scanY; /* Y-position at which scan started (e.g.
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* button was pressed here). */
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int scanYOrigin; /* Value of yOrigin field when scan started. */
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/*
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* Information used to speed up searches by remembering the last item
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* created or found with an item id search.
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*/
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Tk_Item *hotPtr; /* Pointer to "hot" item (one that's been
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* recently used. NULL means there's no hot
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* item. */
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Tk_Item *hotPrevPtr; /* Pointer to predecessor to hotPtr (NULL
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* means item is first in list). This is only
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* a hint and may not really be hotPtr's
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* predecessor. */
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/*
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* Miscellaneous information:
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*/
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Tk_Cursor cursor; /* Current cursor for window, or None. */
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char *takeFocus; /* Value of -takefocus option; not used in the
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* C code, but used by keyboard traversal
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* scripts. Malloc'ed, but may be NULL. */
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double pixelsPerMM; /* Scale factor between MM and pixels; used
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* when converting coordinates. */
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int flags; /* Various flags; see below for
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* definitions. */
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int nextId; /* Number to use as id for next item created
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* in widget. */
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Tk_PostscriptInfo psInfo; /* Pointer to information used for generating
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* Postscript for the canvas. NULL means no
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* Postscript is currently being generated. */
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Tcl_HashTable idTable; /* Table of integer indices. */
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/*
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* Additional information, added by the 'dash'-patch
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*/
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void *reserved1;
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Tk_State canvas_state; /* State of canvas. */
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void *reserved2;
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void *reserved3;
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Tk_TSOffset tsoffset;
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#ifndef USE_OLD_TAG_SEARCH
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TagSearchExpr *bindTagExprs;/* Linked list of tag expressions used in
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* bindings. */
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#endif
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} TkCanvas;
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/*
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* Flag bits for canvases:
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*
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* REDRAW_PENDING - 1 means a DoWhenIdle handler has already been
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* created to redraw some or all of the canvas.
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* REDRAW_BORDERS - 1 means that the borders need to be redrawn
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* during the next redisplay operation.
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* REPICK_NEEDED - 1 means DisplayCanvas should pick a new
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* current item before redrawing the canvas.
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* GOT_FOCUS - 1 means the focus is currently in this widget,
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* so should draw the insertion cursor and
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* traversal highlight.
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* CURSOR_ON - 1 means the insertion cursor is in the "on"
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* phase of its blink cycle. 0 means either we
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* don't have the focus or the cursor is in the
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* "off" phase of its cycle.
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* UPDATE_SCROLLBARS - 1 means the scrollbars should get updated as
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* part of the next display operation.
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* LEFT_GRABBED_ITEM - 1 means that the mouse left the current item
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* while a grab was in effect, so we didn't
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* change canvasPtr->currentItemPtr.
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* REPICK_IN_PROGRESS - 1 means PickCurrentItem is currently
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* executing. If it should be called recursively,
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* it should simply return immediately.
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* BBOX_NOT_EMPTY - 1 means that the bounding box of the area that
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* should be redrawn is not empty.
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*/
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#define REDRAW_PENDING 1
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#define REDRAW_BORDERS 2
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#define REPICK_NEEDED 4
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#define GOT_FOCUS 8
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#define CURSOR_ON 0x10
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#define UPDATE_SCROLLBARS 0x20
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#define LEFT_GRABBED_ITEM 0x40
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#define REPICK_IN_PROGRESS 0x100
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#define BBOX_NOT_EMPTY 0x200
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/*
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* Flag bits for canvas items (redraw_flags):
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*
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* FORCE_REDRAW - 1 means that the new coordinates of some item
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* are not yet registered using
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* Tk_CanvasEventuallyRedraw(). It should still
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* be done by the general canvas code.
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*/
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#define FORCE_REDRAW 8
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/*
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* Canvas-related functions that are shared among Tk modules but not exported
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* to the outside world:
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*/
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MODULE_SCOPE int TkCanvPostscriptCmd(TkCanvas *canvasPtr,
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Tcl_Interp *interp, int argc, CONST char **argv);
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MODULE_SCOPE int TkCanvTranslatePath(TkCanvas *canvPtr,
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int numVertex, double *coordPtr, int closed,
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XPoint *outPtr);
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/*
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* Standard item types provided by Tk:
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*/
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MODULE_SCOPE Tk_ItemType tkArcType, tkBitmapType, tkImageType, tkLineType;
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MODULE_SCOPE Tk_ItemType tkOvalType, tkPolygonType;
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MODULE_SCOPE Tk_ItemType tkRectangleType, tkTextType, tkWindowType;
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#endif /* _TKCANVAS */
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