diff options
Diffstat (limited to 'tk8.6/unix/tkUnixScale.c')
| -rw-r--r-- | tk8.6/unix/tkUnixScale.c | 731 |
1 files changed, 731 insertions, 0 deletions
diff --git a/tk8.6/unix/tkUnixScale.c b/tk8.6/unix/tkUnixScale.c new file mode 100644 index 0000000..8f88018 --- /dev/null +++ b/tk8.6/unix/tkUnixScale.c @@ -0,0 +1,731 @@ +/* + * tkUnixScale.c -- + * + * This file implements the X specific portion of the scrollbar widget. + * + * Copyright (c) 1996 by Sun Microsystems, Inc. + * Copyright (c) 1998-2000 by Scriptics Corporation. + * + * See the file "license.terms" for information on usage and redistribution of + * this file, and for a DISCLAIMER OF ALL WARRANTIES. + */ + +#include "tkInt.h" +#include "tkScale.h" + +#if defined(_WIN32) +#define snprintf _snprintf +#endif + +/* + * Forward declarations for functions defined later in this file: + */ + +static void DisplayHorizontalScale(TkScale *scalePtr, + Drawable drawable, XRectangle *drawnAreaPtr); +static void DisplayHorizontalValue(TkScale *scalePtr, + Drawable drawable, double value, int top); +static void DisplayVerticalScale(TkScale *scalePtr, + Drawable drawable, XRectangle *drawnAreaPtr); +static void DisplayVerticalValue(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( + Tk_Window tkwin) +{ + return ckalloc(sizeof(TkScale)); +} + +/* + *---------------------------------------------------------------------- + * + * TkpDestroyScale -- + * + * Destroy a TkScale structure. It's necessary to do this with + * Tcl_EventuallyFree to allow the Tcl_Preserve(scalePtr) to work as + * expected in TkpDisplayScale. (hobbs) + * + * Results: + * None + * + * Side effects: + * Memory is freed. + * + *---------------------------------------------------------------------- + */ + +void +TkpDestroyScale( + TkScale *scalePtr) +{ + Tcl_EventuallyFree(scalePtr, TCL_DYNAMIC); +} + +/* + *-------------------------------------------------------------- + * + * DisplayVerticalScale -- + * + * This function 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( + 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, tickInterval = scalePtr->tickInterval; + 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 (tickInterval != 0) { + double ticks, maxTicks; + + /* + * Ensure that we will only draw enough of the tick values such + * that they don't overlap + */ + + ticks = fabs((scalePtr->toValue - scalePtr->fromValue) + / tickInterval); + maxTicks = (double) Tk_Height(tkwin) + / (double) scalePtr->fontHeight; + if (ticks > maxTicks) { + tickInterval *= (ticks / maxTicks); + } + for (tickValue = scalePtr->fromValue; ; + tickValue += 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 == STATE_ACTIVE) { + sliderBorder = scalePtr->activeBorder; + } else { + sliderBorder = scalePtr->bgBorder; + } + width = scalePtr->width; + height = scalePtr->sliderLength/2; + x = scalePtr->vertTroughX + scalePtr->borderWidth; + y = TkScaleValueToPixel(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 function 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( + 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[TCL_DOUBLE_SPACE]; + Tk_FontMetrics fm; + + Tk_GetFontMetrics(scalePtr->tkfont, &fm); + y = TkScaleValueToPixel(scalePtr, value) + fm.ascent/2; + if (snprintf(valueString, TCL_DOUBLE_SPACE, scalePtr->format, value) < 0) { + valueString[TCL_DOUBLE_SPACE - 1] = '\0'; + } + length = (int) 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 function 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( + 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, tickInterval = scalePtr->tickInterval; + 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 (tickInterval != 0) { + char valueString[TCL_DOUBLE_SPACE]; + double ticks, maxTicks; + + /* + * Ensure that we will only draw enough of the tick values such + * that they don't overlap. We base this off the width that + * fromValue would take. Not exact, but better than no constraint. + */ + + ticks = fabs((scalePtr->toValue - scalePtr->fromValue) + / tickInterval); + if (snprintf(valueString, TCL_DOUBLE_SPACE, scalePtr->format, + scalePtr->fromValue) < 0) { + valueString[TCL_DOUBLE_SPACE - 1] = '\0'; + } + maxTicks = (double) Tk_Width(tkwin) + / (double) Tk_TextWidth(scalePtr->tkfont, valueString, -1); + if (ticks > maxTicks) { + tickInterval *= (ticks / maxTicks); + } + for (tickValue = scalePtr->fromValue; ; + tickValue += 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 == STATE_ACTIVE) { + sliderBorder = scalePtr->activeBorder; + } else { + sliderBorder = scalePtr->bgBorder; + } + width = scalePtr->sliderLength/2; + height = scalePtr->width; + x = TkScaleValueToPixel(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 function 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( + 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[TCL_DOUBLE_SPACE]; + Tk_FontMetrics fm; + + x = TkScaleValueToPixel(scalePtr, value); + Tk_GetFontMetrics(scalePtr->tkfont, &fm); + y = top + fm.ascent; + if (snprintf(valueString, TCL_DOUBLE_SPACE, scalePtr->format, value) < 0) { + valueString[TCL_DOUBLE_SPACE - 1] = '\0'; + } + length = (int) 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; + } + + /* + * Check the right border so use starting point +text width for the check. + */ + + if (x + width >= (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 function 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) /* Widget record for scale. */ +{ + TkScale *scalePtr = (TkScale *) clientData; + Tk_Window tkwin = scalePtr->tkwin; + Tcl_Interp *interp = scalePtr->interp; + Pixmap pixmap; + int result; + char string[TCL_DOUBLE_SPACE]; + XRectangle drawnArea; + Tcl_DString buf; + + scalePtr->flags &= ~REDRAW_PENDING; + if ((scalePtr->tkwin == NULL) || !Tk_IsMapped(scalePtr->tkwin)) { + goto done; + } + + /* + * Invoke the scale's command if needed. + */ + + Tcl_Preserve(scalePtr); + if ((scalePtr->flags & INVOKE_COMMAND) && (scalePtr->command != NULL)) { + Tcl_Preserve(interp); + if (snprintf(string, TCL_DOUBLE_SPACE, scalePtr->format, + scalePtr->value) < 0) { + string[TCL_DOUBLE_SPACE - 1] = '\0'; + } + Tcl_DStringInit(&buf); + Tcl_DStringAppend(&buf, scalePtr->command, -1); + Tcl_DStringAppend(&buf, " ", -1); + Tcl_DStringAppend(&buf, string, -1); + result = Tcl_EvalEx(interp, Tcl_DStringValue(&buf), -1, 0); + Tcl_DStringFree(&buf); + if (result != TCL_OK) { + Tcl_AddErrorInfo(interp, "\n (command executed by scale)"); + Tcl_BackgroundException(interp, result); + } + Tcl_Release(interp); + } + scalePtr->flags &= ~INVOKE_COMMAND; + if (scalePtr->flags & SCALE_DELETED) { + Tcl_Release(scalePtr); + return; + } + Tcl_Release(scalePtr); + +#ifndef TK_NO_DOUBLE_BUFFERING + /* + * In order to avoid screen flashes, this function 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)); +#else + pixmap = Tk_WindowId(tkwin); +#endif /* TK_NO_DOUBLE_BUFFERING */ + 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->orient == ORIENT_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( + Tk_3DBorderColor(scalePtr->highlightBorder), pixmap); + } + Tk_DrawFocusHighlight(tkwin, gc, scalePtr->highlightWidth, pixmap); + } + } + +#ifndef TK_NO_DOUBLE_BUFFERING + /* + * 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); +#endif /* TK_NO_DOUBLE_BUFFERING */ + + 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( + TkScale *scalePtr, /* Widget record for scale. */ + int x, int y) /* Coordinates within scalePtr's window. */ +{ + int sliderFirst; + + if (scalePtr->orient == ORIENT_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 = TkScaleValueToPixel(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 = TkScaleValueToPixel(scalePtr, scalePtr->value) + - scalePtr->sliderLength/2; + if (x < sliderFirst) { + return TROUGH1; + } + if (x < (sliderFirst+scalePtr->sliderLength)) { + return SLIDER; + } + return TROUGH2; +} + +/* + * Local Variables: + * mode: c + * c-basic-offset: 4 + * fill-column: 78 + * End: + */ |