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Diffstat (limited to 'tk8.6/generic/tkCanvas.h')
| -rw-r--r-- | tk8.6/generic/tkCanvas.h | 312 |
1 files changed, 312 insertions, 0 deletions
diff --git a/tk8.6/generic/tkCanvas.h b/tk8.6/generic/tkCanvas.h new file mode 100644 index 0000000..b8b1b46 --- /dev/null +++ b/tk8.6/generic/tkCanvas.h @@ -0,0 +1,312 @@ +/* + * 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 */ |