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[/] [or1k/] [tags/] [start/] [insight/] [tk/] [unix/] [tkUnixScale.c] - Rev 578
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/* * tkUnixScale.c -- * * This file implements the X specific portion of the scrollbar * widget. * * Copyright (c) 1996 by 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: tkUnixScale.c,v 1.1.1.1 2002-01-16 10:26:01 markom Exp $ */ #include "tkScale.h" #include "tkInt.h" /* * Forward declarations for procedures defined later in this file: */ static void DisplayHorizontalScale _ANSI_ARGS_((TkScale *scalePtr, Drawable drawable, XRectangle *drawnAreaPtr)); static void DisplayHorizontalValue _ANSI_ARGS_((TkScale *scalePtr, Drawable drawable, double value, int top)); static void DisplayVerticalScale _ANSI_ARGS_((TkScale *scalePtr, Drawable drawable, XRectangle *drawnAreaPtr)); static void DisplayVerticalValue _ANSI_ARGS_((TkScale *scalePtr, Drawable drawable, double value, int rightEdge)); /* *---------------------------------------------------------------------- * * TkpCreateScale -- * * Allocate a new TkScale structure. * * Results: * Returns a newly allocated TkScale structure. * * Side effects: * None. * *---------------------------------------------------------------------- */ TkScale * TkpCreateScale(tkwin) Tk_Window tkwin; { return (TkScale *) ckalloc(sizeof(TkScale)); } /* *---------------------------------------------------------------------- * * TkpDestroyScale -- * * Destroy a TkScale structure. * * Results: * None * * Side effects: * Memory is freed. * *---------------------------------------------------------------------- */ void TkpDestroyScale(scalePtr) TkScale *scalePtr; { ckfree((char *) scalePtr); } /* *-------------------------------------------------------------- * * DisplayVerticalScale -- * * This procedure redraws the contents of a vertical scale * 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: * There is no return value. If only a part of the scale needs * to be redrawn, then drawnAreaPtr is modified to reflect the * area that was actually modified. * * Side effects: * Information appears on the screen. * *-------------------------------------------------------------- */ static void DisplayVerticalScale(scalePtr, drawable, drawnAreaPtr) TkScale *scalePtr; /* Widget record for scale. */ Drawable drawable; /* Where to display scale (window * or pixmap). */ XRectangle *drawnAreaPtr; /* Initally contains area of window; * if only a part of the scale is * redrawn, gets modified to reflect * the part of the window that was * redrawn. */ { Tk_Window tkwin = scalePtr->tkwin; int x, y, width, height, shadowWidth; double tickValue; Tk_3DBorder sliderBorder; /* * Display the information from left to right across the window. */ if (!(scalePtr->flags & REDRAW_OTHER)) { drawnAreaPtr->x = scalePtr->vertTickRightX; drawnAreaPtr->y = scalePtr->inset; drawnAreaPtr->width = scalePtr->vertTroughX + scalePtr->width + 2*scalePtr->borderWidth - scalePtr->vertTickRightX; drawnAreaPtr->height -= 2*scalePtr->inset; } Tk_Fill3DRectangle(tkwin, drawable, scalePtr->bgBorder, drawnAreaPtr->x, drawnAreaPtr->y, drawnAreaPtr->width, drawnAreaPtr->height, 0, TK_RELIEF_FLAT); if (scalePtr->flags & REDRAW_OTHER) { /* * Display the tick marks. */ if (scalePtr->tickInterval != 0) { for (tickValue = scalePtr->fromValue; ; tickValue += scalePtr->tickInterval) { /* * The TkRoundToResolution call gets rid of accumulated * round-off errors, if any. */ tickValue = TkRoundToResolution(scalePtr, tickValue); if (scalePtr->toValue >= scalePtr->fromValue) { if (tickValue > scalePtr->toValue) { break; } } else { if (tickValue < scalePtr->toValue) { break; } } DisplayVerticalValue(scalePtr, drawable, tickValue, scalePtr->vertTickRightX); } } } /* * Display the value, if it is desired. */ if (scalePtr->showValue) { DisplayVerticalValue(scalePtr, drawable, scalePtr->value, scalePtr->vertValueRightX); } /* * Display the trough and the slider. */ Tk_Draw3DRectangle(tkwin, drawable, scalePtr->bgBorder, scalePtr->vertTroughX, scalePtr->inset, scalePtr->width + 2*scalePtr->borderWidth, Tk_Height(tkwin) - 2*scalePtr->inset, scalePtr->borderWidth, TK_RELIEF_SUNKEN); XFillRectangle(scalePtr->display, drawable, scalePtr->troughGC, scalePtr->vertTroughX + scalePtr->borderWidth, scalePtr->inset + scalePtr->borderWidth, (unsigned) scalePtr->width, (unsigned) (Tk_Height(tkwin) - 2*scalePtr->inset - 2*scalePtr->borderWidth)); if (scalePtr->state == tkActiveUid) { sliderBorder = scalePtr->activeBorder; } else { sliderBorder = scalePtr->bgBorder; } width = scalePtr->width; height = scalePtr->sliderLength/2; x = scalePtr->vertTroughX + scalePtr->borderWidth; y = TkpValueToPixel(scalePtr, scalePtr->value) - height; shadowWidth = scalePtr->borderWidth/2; if (shadowWidth == 0) { shadowWidth = 1; } Tk_Draw3DRectangle(tkwin, drawable, sliderBorder, x, y, width, 2*height, shadowWidth, scalePtr->sliderRelief); x += shadowWidth; y += shadowWidth; width -= 2*shadowWidth; height -= shadowWidth; Tk_Fill3DRectangle(tkwin, drawable, sliderBorder, x, y, width, height, shadowWidth, scalePtr->sliderRelief); Tk_Fill3DRectangle(tkwin, drawable, sliderBorder, x, y+height, width, height, shadowWidth, scalePtr->sliderRelief); /* * Draw the label to the right of the scale. */ if ((scalePtr->flags & REDRAW_OTHER) && (scalePtr->labelLength != 0)) { Tk_FontMetrics fm; Tk_GetFontMetrics(scalePtr->tkfont, &fm); Tk_DrawChars(scalePtr->display, drawable, scalePtr->textGC, scalePtr->tkfont, scalePtr->label, scalePtr->labelLength, scalePtr->vertLabelX, scalePtr->inset + (3*fm.ascent)/2); } } /* *---------------------------------------------------------------------- * * DisplayVerticalValue -- * * This procedure is called to display values (scale readings) * for vertically-oriented scales. * * Results: * None. * * Side effects: * The numerical value corresponding to value is displayed with * its right edge at "rightEdge", and at a vertical position in * the scale that corresponds to "value". * *---------------------------------------------------------------------- */ static void DisplayVerticalValue(scalePtr, drawable, value, rightEdge) register TkScale *scalePtr; /* Information about widget in which to * display value. */ Drawable drawable; /* Pixmap or window in which to draw * the value. */ double value; /* Y-coordinate of number to display, * specified in application coords, not * in pixels (we'll compute pixels). */ int rightEdge; /* X-coordinate of right edge of text, * specified in pixels. */ { register Tk_Window tkwin = scalePtr->tkwin; int y, width, length; char valueString[PRINT_CHARS]; Tk_FontMetrics fm; Tk_GetFontMetrics(scalePtr->tkfont, &fm); y = TkpValueToPixel(scalePtr, value) + fm.ascent/2; sprintf(valueString, scalePtr->format, value); length = strlen(valueString); width = Tk_TextWidth(scalePtr->tkfont, valueString, length); /* * Adjust the y-coordinate if necessary to keep the text entirely * inside the window. */ if ((y - fm.ascent) < (scalePtr->inset + SPACING)) { y = scalePtr->inset + SPACING + fm.ascent; } if ((y + fm.descent) > (Tk_Height(tkwin) - scalePtr->inset - SPACING)) { y = Tk_Height(tkwin) - scalePtr->inset - SPACING - fm.descent; } Tk_DrawChars(scalePtr->display, drawable, scalePtr->textGC, scalePtr->tkfont, valueString, length, rightEdge - width, y); } /* *-------------------------------------------------------------- * * DisplayHorizontalScale -- * * This procedure redraws the contents of a horizontal scale * 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: * There is no return value. If only a part of the scale needs * to be redrawn, then drawnAreaPtr is modified to reflect the * area that was actually modified. * * Side effects: * Information appears on the screen. * *-------------------------------------------------------------- */ static void DisplayHorizontalScale(scalePtr, drawable, drawnAreaPtr) TkScale *scalePtr; /* Widget record for scale. */ Drawable drawable; /* Where to display scale (window * or pixmap). */ XRectangle *drawnAreaPtr; /* Initally contains area of window; * if only a part of the scale is * redrawn, gets modified to reflect * the part of the window that was * redrawn. */ { register Tk_Window tkwin = scalePtr->tkwin; int x, y, width, height, shadowWidth; double tickValue; Tk_3DBorder sliderBorder; /* * Display the information from bottom to top across the window. */ if (!(scalePtr->flags & REDRAW_OTHER)) { drawnAreaPtr->x = scalePtr->inset; drawnAreaPtr->y = scalePtr->horizValueY; drawnAreaPtr->width -= 2*scalePtr->inset; drawnAreaPtr->height = scalePtr->horizTroughY + scalePtr->width + 2*scalePtr->borderWidth - scalePtr->horizValueY; } Tk_Fill3DRectangle(tkwin, drawable, scalePtr->bgBorder, drawnAreaPtr->x, drawnAreaPtr->y, drawnAreaPtr->width, drawnAreaPtr->height, 0, TK_RELIEF_FLAT); if (scalePtr->flags & REDRAW_OTHER) { /* * Display the tick marks. */ if (scalePtr->tickInterval != 0) { for (tickValue = scalePtr->fromValue; ; tickValue += scalePtr->tickInterval) { /* * The TkRoundToResolution call gets rid of accumulated * round-off errors, if any. */ tickValue = TkRoundToResolution(scalePtr, tickValue); if (scalePtr->toValue >= scalePtr->fromValue) { if (tickValue > scalePtr->toValue) { break; } } else { if (tickValue < scalePtr->toValue) { break; } } DisplayHorizontalValue(scalePtr, drawable, tickValue, scalePtr->horizTickY); } } } /* * Display the value, if it is desired. */ if (scalePtr->showValue) { DisplayHorizontalValue(scalePtr, drawable, scalePtr->value, scalePtr->horizValueY); } /* * Display the trough and the slider. */ y = scalePtr->horizTroughY; Tk_Draw3DRectangle(tkwin, drawable, scalePtr->bgBorder, scalePtr->inset, y, Tk_Width(tkwin) - 2*scalePtr->inset, scalePtr->width + 2*scalePtr->borderWidth, scalePtr->borderWidth, TK_RELIEF_SUNKEN); XFillRectangle(scalePtr->display, drawable, scalePtr->troughGC, scalePtr->inset + scalePtr->borderWidth, y + scalePtr->borderWidth, (unsigned) (Tk_Width(tkwin) - 2*scalePtr->inset - 2*scalePtr->borderWidth), (unsigned) scalePtr->width); if (scalePtr->state == tkActiveUid) { sliderBorder = scalePtr->activeBorder; } else { sliderBorder = scalePtr->bgBorder; } width = scalePtr->sliderLength/2; height = scalePtr->width; x = TkpValueToPixel(scalePtr, scalePtr->value) - width; y += scalePtr->borderWidth; shadowWidth = scalePtr->borderWidth/2; if (shadowWidth == 0) { shadowWidth = 1; } Tk_Draw3DRectangle(tkwin, drawable, sliderBorder, x, y, 2*width, height, shadowWidth, scalePtr->sliderRelief); x += shadowWidth; y += shadowWidth; width -= shadowWidth; height -= 2*shadowWidth; Tk_Fill3DRectangle(tkwin, drawable, sliderBorder, x, y, width, height, shadowWidth, scalePtr->sliderRelief); Tk_Fill3DRectangle(tkwin, drawable, sliderBorder, x+width, y, width, height, shadowWidth, scalePtr->sliderRelief); /* * Draw the label at the top of the scale. */ if ((scalePtr->flags & REDRAW_OTHER) && (scalePtr->labelLength != 0)) { Tk_FontMetrics fm; Tk_GetFontMetrics(scalePtr->tkfont, &fm); Tk_DrawChars(scalePtr->display, drawable, scalePtr->textGC, scalePtr->tkfont, scalePtr->label, scalePtr->labelLength, scalePtr->inset + fm.ascent/2, scalePtr->horizLabelY + fm.ascent); } } /* *---------------------------------------------------------------------- * * DisplayHorizontalValue -- * * This procedure is called to display values (scale readings) * for horizontally-oriented scales. * * Results: * None. * * Side effects: * The numerical value corresponding to value is displayed with * its bottom edge at "bottom", and at a horizontal position in * the scale that corresponds to "value". * *---------------------------------------------------------------------- */ static void DisplayHorizontalValue(scalePtr, drawable, value, top) register TkScale *scalePtr; /* Information about widget in which to * display value. */ Drawable drawable; /* Pixmap or window in which to draw * the value. */ double value; /* X-coordinate of number to display, * specified in application coords, not * in pixels (we'll compute pixels). */ int top; /* Y-coordinate of top edge of text, * specified in pixels. */ { register Tk_Window tkwin = scalePtr->tkwin; int x, y, length, width; char valueString[PRINT_CHARS]; Tk_FontMetrics fm; x = TkpValueToPixel(scalePtr, value); Tk_GetFontMetrics(scalePtr->tkfont, &fm); y = top + fm.ascent; sprintf(valueString, scalePtr->format, value); length = strlen(valueString); width = Tk_TextWidth(scalePtr->tkfont, valueString, length); /* * Adjust the x-coordinate if necessary to keep the text entirely * inside the window. */ x -= (width)/2; if (x < (scalePtr->inset + SPACING)) { x = scalePtr->inset + SPACING; } if (x > (Tk_Width(tkwin) - scalePtr->inset)) { x = Tk_Width(tkwin) - scalePtr->inset - SPACING - width; } Tk_DrawChars(scalePtr->display, drawable, scalePtr->textGC, scalePtr->tkfont, valueString, length, x, y); } /* *---------------------------------------------------------------------- * * TkpDisplayScale -- * * This procedure is invoked as an idle handler to redisplay * the contents of a scale widget. * * Results: * None. * * Side effects: * The scale gets redisplayed. * *---------------------------------------------------------------------- */ void TkpDisplayScale(clientData) ClientData clientData; /* Widget record for scale. */ { TkScale *scalePtr = (TkScale *) clientData; Tk_Window tkwin = scalePtr->tkwin; Tcl_Interp *interp = scalePtr->interp; Pixmap pixmap; int result; char string[PRINT_CHARS]; XRectangle drawnArea; if ((scalePtr->tkwin == NULL) || !Tk_IsMapped(scalePtr->tkwin)) { goto done; } /* * Invoke the scale's command if needed. */ Tcl_Preserve((ClientData) scalePtr); Tcl_Preserve((ClientData) interp); if ((scalePtr->flags & INVOKE_COMMAND) && (scalePtr->command != NULL)) { sprintf(string, scalePtr->format, scalePtr->value); result = Tcl_VarEval(interp, scalePtr->command, " ", string, (char *) NULL); if (result != TCL_OK) { Tcl_AddErrorInfo(interp, "\n (command executed by scale)"); Tcl_BackgroundError(interp); } } Tcl_Release((ClientData) interp); scalePtr->flags &= ~INVOKE_COMMAND; if (scalePtr->tkwin == NULL) { Tcl_Release((ClientData) scalePtr); return; } Tcl_Release((ClientData) scalePtr); /* * In order to avoid screen flashes, this procedure redraws * the scale in a pixmap, then copies the pixmap to the * screen in a single operation. This means that there's no * point in time where the on-sreen image has been cleared. */ pixmap = Tk_GetPixmap(scalePtr->display, Tk_WindowId(tkwin), Tk_Width(tkwin), Tk_Height(tkwin), Tk_Depth(tkwin)); drawnArea.x = 0; drawnArea.y = 0; drawnArea.width = Tk_Width(tkwin); drawnArea.height = Tk_Height(tkwin); /* * Much of the redisplay is done totally differently for * horizontal and vertical scales. Handle the part that's * different. */ if (scalePtr->vertical) { DisplayVerticalScale(scalePtr, pixmap, &drawnArea); } else { DisplayHorizontalScale(scalePtr, pixmap, &drawnArea); } /* * Now handle the part of redisplay that is the same for * horizontal and vertical scales: border and traversal * highlight. */ if (scalePtr->flags & REDRAW_OTHER) { if (scalePtr->relief != TK_RELIEF_FLAT) { Tk_Draw3DRectangle(tkwin, pixmap, scalePtr->bgBorder, scalePtr->highlightWidth, scalePtr->highlightWidth, Tk_Width(tkwin) - 2*scalePtr->highlightWidth, Tk_Height(tkwin) - 2*scalePtr->highlightWidth, scalePtr->borderWidth, scalePtr->relief); } if (scalePtr->highlightWidth != 0) { GC gc; if (scalePtr->flags & GOT_FOCUS) { gc = Tk_GCForColor(scalePtr->highlightColorPtr, pixmap); } else { gc = Tk_GCForColor(scalePtr->highlightBgColorPtr, pixmap); } Tk_DrawFocusHighlight(tkwin, gc, scalePtr->highlightWidth, pixmap); } } /* * Copy the information from the off-screen pixmap onto the screen, * then delete the pixmap. */ XCopyArea(scalePtr->display, pixmap, Tk_WindowId(tkwin), scalePtr->copyGC, drawnArea.x, drawnArea.y, drawnArea.width, drawnArea.height, drawnArea.x, drawnArea.y); Tk_FreePixmap(scalePtr->display, pixmap); done: scalePtr->flags &= ~REDRAW_ALL; } /* *---------------------------------------------------------------------- * * TkpScaleElement -- * * Determine which part of a scale widget lies under a given * point. * * Results: * The return value is either TROUGH1, SLIDER, TROUGH2, or * OTHER, depending on which of the scale's active elements * (if any) is under the point at (x,y). * * Side effects: * None. * *---------------------------------------------------------------------- */ int TkpScaleElement(scalePtr, x, y) TkScale *scalePtr; /* Widget record for scale. */ int x, y; /* Coordinates within scalePtr's window. */ { int sliderFirst; if (scalePtr->vertical) { if ((x < scalePtr->vertTroughX) || (x >= (scalePtr->vertTroughX + 2*scalePtr->borderWidth + scalePtr->width))) { return OTHER; } if ((y < scalePtr->inset) || (y >= (Tk_Height(scalePtr->tkwin) - scalePtr->inset))) { return OTHER; } sliderFirst = TkpValueToPixel(scalePtr, scalePtr->value) - scalePtr->sliderLength/2; if (y < sliderFirst) { return TROUGH1; } if (y < (sliderFirst+scalePtr->sliderLength)) { return SLIDER; } return TROUGH2; } if ((y < scalePtr->horizTroughY) || (y >= (scalePtr->horizTroughY + 2*scalePtr->borderWidth + scalePtr->width))) { return OTHER; } if ((x < scalePtr->inset) || (x >= (Tk_Width(scalePtr->tkwin) - scalePtr->inset))) { return OTHER; } sliderFirst = TkpValueToPixel(scalePtr, scalePtr->value) - scalePtr->sliderLength/2; if (x < sliderFirst) { return TROUGH1; } if (x < (sliderFirst+scalePtr->sliderLength)) { return SLIDER; } return TROUGH2; } /* *-------------------------------------------------------------- * * TkpSetScaleValue -- * * This procedure changes the value of a scale and invokes * a Tcl command to reflect the current position of a scale * * Results: * None. * * Side effects: * A Tcl command is invoked, and an additional error-processing * command may also be invoked. The scale's slider is redrawn. * *-------------------------------------------------------------- */ void TkpSetScaleValue(scalePtr, value, setVar, invokeCommand) register TkScale *scalePtr; /* Info about widget. */ double value; /* New value for scale. Gets adjusted * if it's off the scale. */ int setVar; /* Non-zero means reflect new value through * to associated variable, if any. */ int invokeCommand; /* Non-zero means invoked -command option * to notify of new value, 0 means don't. */ { char string[PRINT_CHARS]; value = TkRoundToResolution(scalePtr, value); if ((value < scalePtr->fromValue) ^ (scalePtr->toValue < scalePtr->fromValue)) { value = scalePtr->fromValue; } if ((value > scalePtr->toValue) ^ (scalePtr->toValue < scalePtr->fromValue)) { value = scalePtr->toValue; } if (scalePtr->flags & NEVER_SET) { scalePtr->flags &= ~NEVER_SET; } else if (scalePtr->value == value) { return; } scalePtr->value = value; if (invokeCommand) { scalePtr->flags |= INVOKE_COMMAND; } TkEventuallyRedrawScale(scalePtr, REDRAW_SLIDER); if (setVar && (scalePtr->varName != NULL)) { sprintf(string, scalePtr->format, scalePtr->value); scalePtr->flags |= SETTING_VAR; Tcl_SetVar(scalePtr->interp, scalePtr->varName, string, TCL_GLOBAL_ONLY); scalePtr->flags &= ~SETTING_VAR; } } /* *---------------------------------------------------------------------- * * TkpPixelToValue -- * * Given a pixel within a scale window, return the scale * reading corresponding to that pixel. * * Results: * A double-precision scale reading. If the value is outside * the legal range for the scale then it's rounded to the nearest * end of the scale. * * Side effects: * None. * *---------------------------------------------------------------------- */ double TkpPixelToValue(scalePtr, x, y) register TkScale *scalePtr; /* Information about widget. */ int x, y; /* Coordinates of point within * window. */ { double value, pixelRange; if (scalePtr->vertical) { pixelRange = Tk_Height(scalePtr->tkwin) - scalePtr->sliderLength - 2*scalePtr->inset - 2*scalePtr->borderWidth; value = y; } else { pixelRange = Tk_Width(scalePtr->tkwin) - scalePtr->sliderLength - 2*scalePtr->inset - 2*scalePtr->borderWidth; value = x; } if (pixelRange <= 0) { /* * Not enough room for the slider to actually slide: just return * the scale's current value. */ return scalePtr->value; } value -= scalePtr->sliderLength/2 + scalePtr->inset + scalePtr->borderWidth; value /= pixelRange; if (value < 0) { value = 0; } if (value > 1) { value = 1; } value = scalePtr->fromValue + value * (scalePtr->toValue - scalePtr->fromValue); return TkRoundToResolution(scalePtr, value); } /* *---------------------------------------------------------------------- * * TkpValueToPixel -- * * Given a reading of the scale, return the x-coordinate or * y-coordinate corresponding to that reading, depending on * whether the scale is vertical or horizontal, respectively. * * Results: * An integer value giving the pixel location corresponding * to reading. The value is restricted to lie within the * defined range for the scale. * * Side effects: * None. * *---------------------------------------------------------------------- */ int TkpValueToPixel(scalePtr, value) register TkScale *scalePtr; /* Information about widget. */ double value; /* Reading of the widget. */ { int y, pixelRange; double valueRange; valueRange = scalePtr->toValue - scalePtr->fromValue; pixelRange = (scalePtr->vertical ? Tk_Height(scalePtr->tkwin) : Tk_Width(scalePtr->tkwin)) - scalePtr->sliderLength - 2*scalePtr->inset - 2*scalePtr->borderWidth; if (valueRange == 0) { y = 0; } else { y = (int) ((value - scalePtr->fromValue) * pixelRange / valueRange + 0.5); if (y < 0) { y = 0; } else if (y > pixelRange) { y = pixelRange; } } y += scalePtr->sliderLength/2 + scalePtr->inset + scalePtr->borderWidth; return y; }
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