tkSquare.c from Gdb at Krugle
Show tkSquare.c syntax highlighted
/*
* tkSquare.c --
*
* This module implements "square" widgets that are object
* based. A "square" is a widget that displays a single square that can
* be moved around and resized. This file is intended as an example
* of how to build a widget; it isn't included in the
* normal wish, but it is included in "tktest".
*
* Copyright (c) 1997 Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* RCS: @(#) $Id: tkSquare.c,v 1.5 2002/01/17 23:33:53 dgp Exp $
*/
#include "tkPort.h"
#define __NO_OLD_CONFIG
#include "tk.h"
#include "tkInt.h"
/*
* A data structure of the following type is kept for each square
* widget managed by this file:
*/
typedef struct {
Tk_Window tkwin; /* Window that embodies the square. NULL
* means window has been deleted but
* widget record hasn't been cleaned up yet. */
Display *display; /* X's token for the window's display. */
Tcl_Interp *interp; /* Interpreter associated with widget. */
Tcl_Command widgetCmd; /* Token for square's widget command. */
Tk_OptionTable optionTable; /* Token representing the configuration
* specifications. */
Tcl_Obj *xPtr, *yPtr; /* Position of square's upper-left corner
* within widget. */
int x, y;
Tcl_Obj *sizeObjPtr; /* Width and height of square. */
/*
* Information used when displaying widget:
*/
Tcl_Obj *borderWidthPtr; /* Width of 3-D border around whole widget. */
Tcl_Obj *bgBorderPtr;
Tcl_Obj *fgBorderPtr;
Tcl_Obj *reliefPtr;
GC gc; /* Graphics context for copying from
* off-screen pixmap onto screen. */
Tcl_Obj *doubleBufferPtr; /* Non-zero means double-buffer redisplay
* with pixmap; zero means draw straight
* onto the display. */
int updatePending; /* Non-zero means a call to SquareDisplay
* has already been scheduled. */
} Square;
/*
* Information used for argv parsing.
*/
static Tk_OptionSpec optionSpecs[] = {
{TK_OPTION_BORDER, "-background", "background", "Background",
"#d9d9d9", Tk_Offset(Square, bgBorderPtr), -1, 0,
(ClientData) "white"},
{TK_OPTION_SYNONYM, "-bd", (char *) NULL, (char *) NULL,
(char *) NULL, 0, -1, 0, (ClientData) "-borderwidth"},
{TK_OPTION_SYNONYM, "-bg", (char *) NULL, (char *) NULL,
(char *) NULL, 0, -1, 0, (ClientData) "-background"},
{TK_OPTION_PIXELS, "-borderwidth", "borderWidth", "BorderWidth",
"2", Tk_Offset(Square, borderWidthPtr), -1},
{TK_OPTION_BOOLEAN, "-dbl", "doubleBuffer", "DoubleBuffer",
"1", Tk_Offset(Square, doubleBufferPtr), -1},
{TK_OPTION_SYNONYM, "-fg", (char *) NULL, (char *) NULL,
(char *) NULL, 0, -1, 0, (ClientData) "-foreground"},
{TK_OPTION_BORDER, "-foreground", "foreground", "Foreground",
"#b03060", Tk_Offset(Square, fgBorderPtr), -1, 0,
(ClientData) "black"},
{TK_OPTION_PIXELS, "-posx", "posx", "PosX", "0",
Tk_Offset(Square, xPtr), -1},
{TK_OPTION_PIXELS, "-posy", "posy", "PosY", "0",
Tk_Offset(Square, yPtr), -1},
{TK_OPTION_RELIEF, "-relief", "relief", "Relief",
"raised", Tk_Offset(Square, reliefPtr), -1},
{TK_OPTION_PIXELS, "-size", "size", "Size", "20",
Tk_Offset(Square, sizeObjPtr), -1},
{TK_OPTION_END}
};
/*
* Forward declarations for procedures defined later in this file:
*/
int SquareObjCmd _ANSI_ARGS_((ClientData clientData,
Tcl_Interp *interp, int objc,
Tcl_Obj * CONST objv[]));
static void SquareDeletedProc _ANSI_ARGS_((
ClientData clientData));
static int SquareConfigure _ANSI_ARGS_((Tcl_Interp *interp,
Square *squarePtr));
static void SquareDestroy _ANSI_ARGS_((char *memPtr));
static void SquareDisplay _ANSI_ARGS_((ClientData clientData));
static void KeepInWindow _ANSI_ARGS_((Square *squarePtr));
static void SquareObjEventProc _ANSI_ARGS_((ClientData clientData,
XEvent *eventPtr));
static int SquareWidgetObjCmd _ANSI_ARGS_((ClientData clientData,
Tcl_Interp *, int objc, Tcl_Obj * CONST objv[]));
/*
*--------------------------------------------------------------
*
* SquareCmd --
*
* This procedure is invoked to process the "square" Tcl
* command. It creates a new "square" widget.
*
* Results:
* A standard Tcl result.
*
* Side effects:
* A new widget is created and configured.
*
*--------------------------------------------------------------
*/
int
SquareObjCmd(clientData, interp, objc, objv)
ClientData clientData; /* NULL. */
Tcl_Interp *interp; /* Current interpreter. */
int objc; /* Number of arguments. */
Tcl_Obj * CONST objv[]; /* Argument objects. */
{
Square *squarePtr;
Tk_Window tkwin;
Tk_OptionTable optionTable;
if (objc < 2) {
Tcl_WrongNumArgs(interp, 1, objv, "pathName ?options?");
return TCL_ERROR;
}
tkwin = Tk_CreateWindowFromPath(interp, Tk_MainWindow(interp),
Tcl_GetStringFromObj(objv[1], NULL), (char *) NULL);
if (tkwin == NULL) {
return TCL_ERROR;
}
Tk_SetClass(tkwin, "Square");
/*
* Create the option table for this widget class. If it has
* already been created, the refcount will get bumped and just
* the pointer will be returned. The refcount getting bumped
* does not concern us, because Tk will ensure the table is
* deleted when the interpreter is destroyed.
*/
optionTable = Tk_CreateOptionTable(interp, optionSpecs);
/*
* Allocate and initialize the widget record. The memset allows
* us to set just the non-NULL/0 items.
*/
squarePtr = (Square *) ckalloc(sizeof(Square));
memset((void *) squarePtr, 0, (sizeof(Square)));
squarePtr->tkwin = tkwin;
squarePtr->display = Tk_Display(tkwin);
squarePtr->interp = interp;
squarePtr->widgetCmd = Tcl_CreateObjCommand(interp,
Tk_PathName(squarePtr->tkwin), SquareWidgetObjCmd,
(ClientData) squarePtr, SquareDeletedProc);
squarePtr->gc = None;
squarePtr->optionTable = optionTable;
if (Tk_InitOptions(interp, (char *) squarePtr, optionTable, tkwin)
!= TCL_OK) {
Tk_DestroyWindow(squarePtr->tkwin);
ckfree((char *) squarePtr);
return TCL_ERROR;
}
Tk_CreateEventHandler(squarePtr->tkwin, ExposureMask|StructureNotifyMask,
SquareObjEventProc, (ClientData) squarePtr);
if (Tk_SetOptions(interp, (char *) squarePtr, optionTable, objc - 2,
objv + 2, tkwin, NULL, (int *) NULL) != TCL_OK) {
goto error;
}
if (SquareConfigure(interp, squarePtr) != TCL_OK) {
goto error;
}
Tcl_SetObjResult(interp,
Tcl_NewStringObj(Tk_PathName(squarePtr->tkwin), -1));
return TCL_OK;
error:
Tk_DestroyWindow(squarePtr->tkwin);
return TCL_ERROR;
}
/*
*--------------------------------------------------------------
*
* SquareWidgetObjCmd --
*
* This procedure is invoked to process the Tcl command
* that corresponds to a widget managed by this module.
* See the user documentation for details on what it does.
*
* Results:
* A standard Tcl result.
*
* Side effects:
* See the user documentation.
*
*--------------------------------------------------------------
*/
static int
SquareWidgetObjCmd(clientData, interp, objc, objv)
ClientData clientData; /* Information about square widget. */
Tcl_Interp *interp; /* Current interpreter. */
int objc; /* Number of arguments. */
Tcl_Obj * CONST objv[]; /* Argument objects. */
{
Square *squarePtr = (Square *) clientData;
int result = TCL_OK;
static CONST char *squareOptions[] = {"cget", "configure", (char *) NULL};
enum {
SQUARE_CGET, SQUARE_CONFIGURE
};
Tcl_Obj *resultObjPtr;
int index;
if (objc < 2) {
Tcl_WrongNumArgs(interp, 1, objv, "option ?arg arg...?");
return TCL_ERROR;
}
if (Tcl_GetIndexFromObj(interp, objv[1], squareOptions, "command",
0, &index) != TCL_OK) {
return TCL_ERROR;
}
Tcl_Preserve((ClientData) squarePtr);
switch (index) {
case SQUARE_CGET: {
if (objc != 3) {
Tcl_WrongNumArgs(interp, 2, objv, "option");
goto error;
}
resultObjPtr = Tk_GetOptionValue(interp, (char *) squarePtr,
squarePtr->optionTable, objv[2], squarePtr->tkwin);
if (resultObjPtr == NULL) {
result = TCL_ERROR;
} else {
Tcl_SetObjResult(interp, resultObjPtr);
}
break;
}
case SQUARE_CONFIGURE: {
resultObjPtr = NULL;
if (objc == 2) {
resultObjPtr = Tk_GetOptionInfo(interp, (char *) squarePtr,
squarePtr->optionTable, (Tcl_Obj *) NULL,
squarePtr->tkwin);
if (resultObjPtr == NULL) {
result = TCL_ERROR;
}
} else if (objc == 3) {
resultObjPtr = Tk_GetOptionInfo(interp, (char *) squarePtr,
squarePtr->optionTable, objv[2], squarePtr->tkwin);
if (resultObjPtr == NULL) {
result = TCL_ERROR;
}
} else {
result = Tk_SetOptions(interp, (char *) squarePtr,
squarePtr->optionTable, objc - 2, objv + 2,
squarePtr->tkwin, NULL, (int *) NULL);
if (result == TCL_OK) {
result = SquareConfigure(interp, squarePtr);
}
if (!squarePtr->updatePending) {
Tcl_DoWhenIdle(SquareDisplay, (ClientData) squarePtr);
squarePtr->updatePending = 1;
}
}
if (resultObjPtr != NULL) {
Tcl_SetObjResult(interp, resultObjPtr);
}
}
}
Tcl_Release((ClientData) squarePtr);
return result;
error:
Tcl_Release((ClientData) squarePtr);
return TCL_ERROR;
}
/*
*----------------------------------------------------------------------
*
* SquareConfigure --
*
* This procedure is called to process an argv/argc list in
* conjunction with the Tk option database to configure (or
* reconfigure) a square widget.
*
* Results:
* The return value is a standard Tcl result. If TCL_ERROR is
* returned, then the interp's result contains an error message.
*
* Side effects:
* Configuration information, such as colors, border width,
* etc. get set for squarePtr; old resources get freed,
* if there were any.
*
*----------------------------------------------------------------------
*/
static int
SquareConfigure(interp, squarePtr)
Tcl_Interp *interp; /* Used for error reporting. */
Square *squarePtr; /* Information about widget. */
{
int borderWidth;
Tk_3DBorder bgBorder;
int doubleBuffer;
/*
* Set the background for the window and create a graphics context
* for use during redisplay.
*/
bgBorder = Tk_Get3DBorderFromObj(squarePtr->tkwin,
squarePtr->bgBorderPtr);
Tk_SetWindowBackground(squarePtr->tkwin,
Tk_3DBorderColor(bgBorder)->pixel);
Tcl_GetBooleanFromObj(NULL, squarePtr->doubleBufferPtr, &doubleBuffer);
if ((squarePtr->gc == None) && (doubleBuffer)) {
XGCValues gcValues;
gcValues.function = GXcopy;
gcValues.graphics_exposures = False;
squarePtr->gc = Tk_GetGC(squarePtr->tkwin,
GCFunction|GCGraphicsExposures, &gcValues);
}
/*
* Register the desired geometry for the window. Then arrange for
* the window to be redisplayed.
*/
Tk_GeometryRequest(squarePtr->tkwin, 200, 150);
Tk_GetPixelsFromObj(NULL, squarePtr->tkwin, squarePtr->borderWidthPtr,
&borderWidth);
Tk_SetInternalBorder(squarePtr->tkwin, borderWidth);
if (!squarePtr->updatePending) {
Tcl_DoWhenIdle(SquareDisplay, (ClientData) squarePtr);
squarePtr->updatePending = 1;
}
KeepInWindow(squarePtr);
return TCL_OK;
}
/*
*--------------------------------------------------------------
*
* SquareObjEventProc --
*
* This procedure is invoked by the Tk dispatcher for various
* events on squares.
*
* Results:
* None.
*
* Side effects:
* When the window gets deleted, internal structures get
* cleaned up. When it gets exposed, it is redisplayed.
*
*--------------------------------------------------------------
*/
static void
SquareObjEventProc(clientData, eventPtr)
ClientData clientData; /* Information about window. */
XEvent *eventPtr; /* Information about event. */
{
Square *squarePtr = (Square *) clientData;
if (eventPtr->type == Expose) {
if (!squarePtr->updatePending) {
Tcl_DoWhenIdle(SquareDisplay, (ClientData) squarePtr);
squarePtr->updatePending = 1;
}
} else if (eventPtr->type == ConfigureNotify) {
KeepInWindow(squarePtr);
if (!squarePtr->updatePending) {
Tcl_DoWhenIdle(SquareDisplay, (ClientData) squarePtr);
squarePtr->updatePending = 1;
}
} else if (eventPtr->type == DestroyNotify) {
if (squarePtr->tkwin != NULL) {
Tk_FreeConfigOptions((char *) squarePtr, squarePtr->optionTable,
squarePtr->tkwin);
if (squarePtr->gc != None) {
Tk_FreeGC(squarePtr->display, squarePtr->gc);
}
squarePtr->tkwin = NULL;
Tcl_DeleteCommandFromToken(squarePtr->interp,
squarePtr->widgetCmd);
}
if (squarePtr->updatePending) {
Tcl_CancelIdleCall(SquareDisplay, (ClientData) squarePtr);
}
Tcl_EventuallyFree((ClientData) squarePtr, SquareDestroy);
}
}
/*
*----------------------------------------------------------------------
*
* SquareDeletedProc --
*
* This procedure is invoked when a widget command is deleted. If
* the widget isn't already in the process of being destroyed,
* this command destroys it.
*
* Results:
* None.
*
* Side effects:
* The widget is destroyed.
*
*----------------------------------------------------------------------
*/
static void
SquareDeletedProc(clientData)
ClientData clientData; /* Pointer to widget record for widget. */
{
Square *squarePtr = (Square *) clientData;
Tk_Window tkwin = squarePtr->tkwin;
/*
* This procedure could be invoked either because the window was
* destroyed and the command was then deleted (in which case tkwin
* is NULL) or because the command was deleted, and then this procedure
* destroys the widget.
*/
if (tkwin != NULL) {
Tk_DestroyWindow(tkwin);
}
}
/*
*--------------------------------------------------------------
*
* SquareDisplay --
*
* This procedure redraws the contents of a square window.
* It is invoked as a do-when-idle handler, so it only runs
* when there's nothing else for the application to do.
*
* Results:
* None.
*
* Side effects:
* Information appears on the screen.
*
*--------------------------------------------------------------
*/
static void
SquareDisplay(clientData)
ClientData clientData; /* Information about window. */
{
Square *squarePtr = (Square *) clientData;
Tk_Window tkwin = squarePtr->tkwin;
Pixmap pm = None;
Drawable d;
int borderWidth, size, relief;
Tk_3DBorder bgBorder, fgBorder;
int doubleBuffer;
squarePtr->updatePending = 0;
if (!Tk_IsMapped(tkwin)) {
return;
}
/*
* Create a pixmap for double-buffering, if necessary.
*/
Tcl_GetBooleanFromObj(NULL, squarePtr->doubleBufferPtr, &doubleBuffer);
if (doubleBuffer) {
pm = Tk_GetPixmap(Tk_Display(tkwin), Tk_WindowId(tkwin),
Tk_Width(tkwin), Tk_Height(tkwin),
DefaultDepthOfScreen(Tk_Screen(tkwin)));
d = pm;
} else {
d = Tk_WindowId(tkwin);
}
/*
* Redraw the widget's background and border.
*/
Tk_GetPixelsFromObj(NULL, squarePtr->tkwin, squarePtr->borderWidthPtr,
&borderWidth);
bgBorder = Tk_Get3DBorderFromObj(squarePtr->tkwin,
squarePtr->bgBorderPtr);
Tk_GetReliefFromObj(NULL, squarePtr->reliefPtr, &relief);
Tk_Fill3DRectangle(tkwin, d, bgBorder, 0, 0, Tk_Width(tkwin),
Tk_Height(tkwin), borderWidth, relief);
/*
* Display the square.
*/
Tk_GetPixelsFromObj(NULL, squarePtr->tkwin, squarePtr->sizeObjPtr, &size);
fgBorder = Tk_Get3DBorderFromObj(squarePtr->tkwin,
squarePtr->fgBorderPtr);
Tk_Fill3DRectangle(tkwin, d, fgBorder, squarePtr->x, squarePtr->y, size,
size, borderWidth, TK_RELIEF_RAISED);
/*
* If double-buffered, copy to the screen and release the pixmap.
*/
if (doubleBuffer) {
XCopyArea(Tk_Display(tkwin), pm, Tk_WindowId(tkwin), squarePtr->gc,
0, 0, (unsigned) Tk_Width(tkwin), (unsigned) Tk_Height(tkwin),
0, 0);
Tk_FreePixmap(Tk_Display(tkwin), pm);
}
}
/*
*----------------------------------------------------------------------
*
* SquareDestroy --
*
* This procedure is invoked by Tcl_EventuallyFree or Tcl_Release
* to clean up the internal structure of a square at a safe time
* (when no-one is using it anymore).
*
* Results:
* None.
*
* Side effects:
* Everything associated with the square is freed up.
*
*----------------------------------------------------------------------
*/
static void
SquareDestroy(memPtr)
char *memPtr; /* Info about square widget. */
{
Square *squarePtr = (Square *) memPtr;
ckfree((char *) squarePtr);
}
/*
*----------------------------------------------------------------------
*
* KeepInWindow --
*
* Adjust the position of the square if necessary to keep it in
* the widget's window.
*
* Results:
* None.
*
* Side effects:
* The x and y position of the square are adjusted if necessary
* to keep the square in the window.
*
*----------------------------------------------------------------------
*/
static void
KeepInWindow(squarePtr)
register Square *squarePtr; /* Pointer to widget record. */
{
int i, bd, relief;
int borderWidth, size;
Tk_GetPixelsFromObj(NULL, squarePtr->tkwin, squarePtr->borderWidthPtr,
&borderWidth);
Tk_GetPixelsFromObj(NULL, squarePtr->tkwin, squarePtr->xPtr,
&squarePtr->x);
Tk_GetPixelsFromObj(NULL, squarePtr->tkwin, squarePtr->yPtr,
&squarePtr->y);
Tk_GetPixelsFromObj(NULL, squarePtr->tkwin, squarePtr->sizeObjPtr, &size);
Tk_GetReliefFromObj(NULL, squarePtr->reliefPtr, &relief);
bd = 0;
if (relief != TK_RELIEF_FLAT) {
bd = borderWidth;
}
i = (Tk_Width(squarePtr->tkwin) - bd) - (squarePtr->x + size);
if (i < 0) {
squarePtr->x += i;
}
i = (Tk_Height(squarePtr->tkwin) - bd) - (squarePtr->y + size);
if (i < 0) {
squarePtr->y += i;
}
if (squarePtr->x < bd) {
squarePtr->x = bd;
}
if (squarePtr->y < bd) {
squarePtr->y = bd;
}
}
See more files for this project here