cpython-source-deps/unix/tkUnixScale.c at tk · python/cpython-source-deps · GitHub

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* tkUnixScale.c --

* This file implements the X specific portion of the scale widget.

* 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"

#ifdef _WIN32

#include "tkWinInt.h"

#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,

const char *format);

static void DisplayVerticalScale(TkScale *scalePtr,

Drawable drawable, XRectangle *drawnAreaPtr);

static void DisplayVerticalValue(TkScale *scalePtr,

Drawable drawable, double value, int rightEdge,

const char *format);

*----------------------------------------------------------------------

* TkpCreateScale --

* Allocate a new TkScale structure.

* Results:

* Returns a newly allocated TkScale structure.

* Side effects:

* None.

*----------------------------------------------------------------------

TkScale *

TkpCreateScale(

TCL_UNUSED(Tk_Window))

{

return (TkScale *)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;

int scaleWidth, borderWidth, sliderLength;

* Display the information from left to right across the window.

Tk_GetPixelsFromObj(NULL, tkwin, scalePtr->widthObj, &scaleWidth);

Tk_GetPixelsFromObj(NULL, tkwin, scalePtr->borderWidthObj, &borderWidth);

Tk_GetPixelsFromObj(NULL, tkwin, scalePtr->sliderLengthObj, &sliderLength);

if (!(scalePtr->flags & REDRAW_OTHER)) {

drawnAreaPtr->x = scalePtr->vertTickRightX;

drawnAreaPtr->y = scalePtr->inset;

drawnAreaPtr->width = scalePtr->vertTroughX + scaleWidth

+ 2 * 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 TkRoundValueToResolution call gets rid of accumulated

* round-off errors, if any.

tickValue = TkRoundValueToResolution(scalePtr, tickValue);

if (scalePtr->toValue >= scalePtr->fromValue) {

if (tickValue > scalePtr->toValue) {

break;

}

} else {

if (tickValue < scalePtr->toValue) {

break;

}

DisplayVerticalValue(scalePtr, drawable, tickValue,

scalePtr->vertTickRightX, scalePtr->tickFormat);

}

* Display the value, if it is desired.

if (scalePtr->showValue) {

DisplayVerticalValue(scalePtr, drawable, scalePtr->value,

scalePtr->vertValueRightX, scalePtr->valueFormat);

}

* Display the trough and the slider.

Tk_Draw3DRectangle(tkwin, drawable,

scalePtr->bgBorder, scalePtr->vertTroughX, scalePtr->inset,

scaleWidth + 2 * borderWidth,

Tk_Height(tkwin) - 2 * scalePtr->inset, borderWidth,

TK_RELIEF_SUNKEN);

XFillRectangle(scalePtr->display, drawable, scalePtr->troughGC,

scalePtr->vertTroughX + borderWidth,

scalePtr->inset + borderWidth,

(unsigned) scaleWidth,

(unsigned) (Tk_Height(tkwin) - 2 * scalePtr->inset

- 2 * borderWidth));

if (scalePtr->state == STATE_ACTIVE) {

sliderBorder = scalePtr->activeBorder;

} else {

sliderBorder = scalePtr->bgBorder;

}

width = scaleWidth;

height = sliderLength / 2;

x = scalePtr->vertTroughX + borderWidth;

y = TkScaleValueToPixel(scalePtr, scalePtr->value) - height;

shadowWidth = 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->labelObj != NULL)) {

Tk_FontMetrics fm;

Tcl_Size labelLength;

const char *label = Tcl_GetStringFromObj(scalePtr->labelObj, &labelLength);

Tk_GetFontMetrics(scalePtr->tkfont, &fm);

Tk_DrawChars(scalePtr->display, drawable, scalePtr->textGC,

scalePtr->tkfont, label, 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(

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. */

const char *format) /* Format string to use for the value */

{

Tk_Window tkwin = scalePtr->tkwin;

int y, width;

char valueString[TCL_DOUBLE_SPACE];

Tk_FontMetrics fm;

Tk_GetFontMetrics(scalePtr->tkfont, &fm);

y = TkScaleValueToPixel(scalePtr, value) + fm.ascent/2;

if (TkFormatDouble(valueString, TCL_DOUBLE_SPACE, format, value) < 0) {

valueString[TCL_DOUBLE_SPACE - 1] = '\0';

}

Tcl_Size 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 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. */

{

Tk_Window tkwin = scalePtr->tkwin;

int x, y, width, height, shadowWidth;

double tickInterval = scalePtr->tickInterval;

Tk_3DBorder sliderBorder;

int scaleWidth, borderWidth, sliderLength;

* Display the information from bottom to top across the window.

Tk_GetPixelsFromObj(NULL, tkwin, scalePtr->widthObj, &scaleWidth);

Tk_GetPixelsFromObj(NULL, tkwin, scalePtr->borderWidthObj, &borderWidth);

Tk_GetPixelsFromObj(NULL, tkwin, scalePtr->sliderLengthObj, &sliderLength);

if (!(scalePtr->flags & REDRAW_OTHER)) {

drawnAreaPtr->x = scalePtr->inset;

drawnAreaPtr->y = scalePtr->horizValueY;

drawnAreaPtr->width -= 2*scalePtr->inset;

drawnAreaPtr->height = scalePtr->horizTroughY + scaleWidth

+ 2 * 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, tickValue;

* 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 (TkFormatDouble(valueString, TCL_DOUBLE_SPACE, scalePtr->tickFormat,

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;

}

tickValue = scalePtr->fromValue;

while (1) {

* The TkRoundValueToResolution call gets rid of accumulated

* round-off errors, if any.

tickValue = TkRoundValueToResolution(scalePtr, tickValue);

if (scalePtr->toValue >= scalePtr->fromValue) {

if (tickValue > scalePtr->toValue) {

break;

}

} else {

if (tickValue < scalePtr->toValue) {

break;

}

DisplayHorizontalValue(scalePtr, drawable, tickValue,

scalePtr->horizTickY, scalePtr->tickFormat);

tickValue += tickInterval;

}

* Display the value, if it is desired.

if (scalePtr->showValue) {

DisplayHorizontalValue(scalePtr, drawable, scalePtr->value,

scalePtr->horizValueY, scalePtr->valueFormat);

}

* Display the trough and the slider.

y = scalePtr->horizTroughY;

Tk_Draw3DRectangle(tkwin, drawable,

scalePtr->bgBorder, scalePtr->inset, y,

Tk_Width(tkwin) - 2 * scalePtr->inset,

scaleWidth + 2 * borderWidth,

borderWidth, TK_RELIEF_SUNKEN);

XFillRectangle(scalePtr->display, drawable, scalePtr->troughGC,

scalePtr->inset + borderWidth,

y + borderWidth,

(unsigned) (Tk_Width(tkwin) - 2 * scalePtr->inset

- 2 * borderWidth),

(unsigned) scaleWidth);

if (scalePtr->state == STATE_ACTIVE) {

sliderBorder = scalePtr->activeBorder;

} else {

sliderBorder = scalePtr->bgBorder;

}

width = sliderLength / 2;

height = scaleWidth;

x = TkScaleValueToPixel(scalePtr, scalePtr->value) - width;

y += borderWidth;

shadowWidth = 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->labelObj != NULL)) {

Tk_FontMetrics fm;

Tcl_Size labelLength;

const char *label = Tcl_GetStringFromObj(scalePtr->labelObj, &labelLength);

Tk_GetFontMetrics(scalePtr->tkfont, &fm);

Tk_DrawChars(scalePtr->display, drawable, scalePtr->textGC,

scalePtr->tkfont, label, 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(

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. */

const char *format) /* Format string to use for the value */

{

Tk_Window tkwin = scalePtr->tkwin;

int x, y, width;

char valueString[TCL_DOUBLE_SPACE];

Tk_FontMetrics fm;

x = TkScaleValueToPixel(scalePtr, value);

Tk_GetFontMetrics(scalePtr->tkfont, &fm);

y = top + fm.ascent;

if (TkFormatDouble(valueString, TCL_DOUBLE_SPACE, format, value) < 0) {

valueString[TCL_DOUBLE_SPACE - 1] = '\0';

}

Tcl_Size 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;

}

* 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(

void *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;

int highlightWidth, borderWidth;

scalePtr->flags &= ~REDRAW_PENDING;

if ((tkwin == NULL) || !Tk_IsMapped(tkwin)) {

goto done;

}

* Invoke the scale's command if needed.

Tcl_Preserve(scalePtr);

if ((scalePtr->flags & INVOKE_COMMAND) && (scalePtr->commandObj != NULL)) {

Tcl_Preserve(interp);

if (TkFormatDouble(string, TCL_DOUBLE_SPACE, scalePtr->valueFormat,

scalePtr->value) < 0) {

string[TCL_DOUBLE_SPACE - 1] = '\0';

}

Tcl_DStringInit(&buf);

Tcl_DStringAppend(&buf, Tcl_GetString(scalePtr->commandObj), TCL_INDEX_NONE);

Tcl_DStringAppend(&buf, " ", TCL_INDEX_NONE);

Tcl_DStringAppend(&buf, string, TCL_INDEX_NONE);

result = Tcl_EvalEx(interp, Tcl_DStringValue(&buf), TCL_INDEX_NONE, TCL_EVAL_GLOBAL);

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.

Tk_GetPixelsFromObj(NULL, tkwin, scalePtr->highlightWidthObj, &highlightWidth);

Tk_GetPixelsFromObj(NULL, tkwin, scalePtr->borderWidthObj, &borderWidth);

if (scalePtr->flags & REDRAW_OTHER) {

if (scalePtr->relief != TK_RELIEF_FLAT) {

Tk_Draw3DRectangle(tkwin, pixmap, scalePtr->bgBorder,

highlightWidth, highlightWidth,

Tk_Width(tkwin) - 2 * highlightWidth,

Tk_Height(tkwin) - 2 * highlightWidth,

borderWidth, scalePtr->relief);

}

if (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, 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, width, borderWidth, sliderLength;

Tk_GetPixelsFromObj(NULL, scalePtr->tkwin, scalePtr->widthObj, &width);

Tk_GetPixelsFromObj(NULL, scalePtr->tkwin, scalePtr->borderWidthObj, &borderWidth);

Tk_GetPixelsFromObj(NULL, scalePtr->tkwin, scalePtr->sliderLengthObj, &sliderLength);

if (scalePtr->orient == ORIENT_VERTICAL) {

if ((x < scalePtr->vertTroughX)

|| (x >= (scalePtr->vertTroughX + 2 * borderWidth +

width))) {

return OTHER;

}

if ((y < scalePtr->inset)

|| (y >= (Tk_Height(scalePtr->tkwin) - scalePtr->inset))) {

return OTHER;

}

sliderFirst = TkScaleValueToPixel(scalePtr, scalePtr->value)

- sliderLength/2;

if (y < sliderFirst) {

return TROUGH1;

}

if (y < sliderFirst + sliderLength) {

return SLIDER;

}

return TROUGH2;

}

if ((y < scalePtr->horizTroughY)

|| (y >= (scalePtr->horizTroughY + 2 * borderWidth +

width))) {

return OTHER;

}

if ((x < scalePtr->inset)

|| (x >= (Tk_Width(scalePtr->tkwin) - scalePtr->inset))) {

return OTHER;

}

sliderFirst = TkScaleValueToPixel(scalePtr, scalePtr->value)

- sliderLength / 2;

if (x < sliderFirst) {

return TROUGH1;

}

if (x < sliderFirst + sliderLength) {

return SLIDER;

}

return TROUGH2;

}

* Local Variables:

* mode: c

* c-basic-offset: 4

* fill-column: 78

* End:

cpython-source-deps/unix/tkUnixScale.c at tk · python/cpython-source-deps · GitHub

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cpython-source-deps/unix/tkUnixScale.c at tk · python/cpython-source-deps · GitHub

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