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Overview
Comment:Factorize the code a bit, and avoid calling the layoutProc twice when calling xview moveto|units|pages.
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SHA3-256: 159f9459ba18138345fb63037ac2922fcabeed082c85abcb6096a2ba71ec9bc0
User & Date: fvogel 2019-04-28 12:52:43.999
Original Comment: Factorized the code a bit, and avoid calling the layoutProc twice when calling xview moveto|units|pages.
Context
2019-04-28
13:57
Fix '.e index @'. The returned answer could be wrong if the scroll info was not yet updated. check-in: f31e1037 user: fvogel tags: bug-2513186fff, bug-8261c517af
12:52
Factorize the code a bit, and avoid calling the layoutProc twice when calling xview moveto|units|pages. check-in: 159f9459 user: fvogel tags: bug-2513186fff, bug-8261c517af
10:45
Add a missing scroll info update needed to make x|yview moveto|units|pages work without an update idletasks call beforehand. check-in: 231587eb user: fvogel tags: bug-2513186fff, bug-8261c517af
Changes
Unified Diff Ignore Whitespace Patch
Changes to generic/ttk/ttkEntry.c.
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{
    Entry *entryPtr = recordPtr;
    if (objc == 3) {
	int newFirst;
	if (EntryIndex(interp, entryPtr, objv[2], &newFirst) != TCL_OK) {
	    return TCL_ERROR;
	}
	TtkScrollTo(entryPtr->entry.xscrollHandle, newFirst);
	return TCL_OK;
    }
    return TtkScrollviewCommand(interp, objc, objv, entryPtr->entry.xscrollHandle);
}

static const Ttk_Ensemble EntryCommands[] = {
    { "bbox", 		EntryBBoxCommand,0 },








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{
    Entry *entryPtr = recordPtr;
    if (objc == 3) {
	int newFirst;
	if (EntryIndex(interp, entryPtr, objv[2], &newFirst) != TCL_OK) {
	    return TCL_ERROR;
	}
	TtkScrollTo(entryPtr->entry.xscrollHandle, newFirst, 1);
	return TCL_OK;
    }
    return TtkScrollviewCommand(interp, objc, objv, entryPtr->entry.xscrollHandle);
}

static const Ttk_Ensemble EntryCommands[] = {
    { "bbox", 		EntryBBoxCommand,0 },
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Changes to generic/ttk/ttkScroll.c.
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 * 	-yscrollcommand has changed).
 */

void TtkScrollbarUpdateRequired(ScrollHandle h)
{
    h->flags |= SCROLL_UPDATE_REQUIRED;
}














/* TtkScrollviewCommand --
 * 	Widget [xy]view command implementation.
 *
 *  $w [xy]view -- return current view region
 *  $w [xy]view $index -- set topmost item
 *  $w [xy]view moveto $fraction
 *  $w [xy]view scroll $number $what -- scrollbar interface
 */
int TtkScrollviewCommand(
    Tcl_Interp *interp, int objc, Tcl_Obj *const objv[], ScrollHandle h)
{
    Scrollable *s = h->scrollPtr;



    int newFirst = s->first;

    if (objc == 2) {
	Tcl_Obj *result[2];

        /*
         * Update the scroll info (first, last, total) if needed.
         */

        if (h->corePtr->flags & REDISPLAY_PENDING) {
            h->corePtr->widgetSpec->layoutProc(h->corePtr);
        }

	result[0] = Tcl_NewDoubleObj((double)s->first / s->total);
	result[1] = Tcl_NewDoubleObj((double)s->last / s->total);
	Tcl_SetObjResult(interp, Tcl_NewListObj(2, result));
	return TCL_OK;
    } else if (objc == 3) {
	if (Tcl_GetIntFromObj(interp, objv[2], &newFirst) != TCL_OK) {
	    return TCL_ERROR;
	}
    } else {
	double fraction;
	int count;

        /*
         * Update the scroll info (first, last, total) if needed.
         */

        if (h->corePtr->flags & REDISPLAY_PENDING) {
            h->corePtr->widgetSpec->layoutProc(h->corePtr);
        }

	switch (Tk_GetScrollInfoObj(interp, objc, objv, &fraction, &count)) {
	    case TK_SCROLL_ERROR:
		return TCL_ERROR;
	    case TK_SCROLL_MOVETO:
		newFirst = (int) ((fraction * s->total) + 0.5);
		break;
	    case TK_SCROLL_UNITS:
		newFirst = s->first + count;
		break;
	    case TK_SCROLL_PAGES: {
		int perPage = s->last - s->first;	/* @@@ */
		newFirst = s->first + count * perPage;
		break;
	    }
	}
    }

    TtkScrollTo(h, newFirst);

    return TCL_OK;
}

void TtkScrollTo(ScrollHandle h, int newFirst)
{
    Scrollable *s = h->scrollPtr;

    /*
     * Update the scroll info (first, last, total) if needed.
     */

    if (h->corePtr->flags & REDISPLAY_PENDING) {
        h->corePtr->widgetSpec->layoutProc(h->corePtr);
    }

    if (newFirst >= s->total)
	newFirst = s->total - 1;
    if (newFirst > s->first && s->last >= s->total) /* don't scroll past end */
	newFirst = s->first;
    if (newFirst < 0)








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 * 	-yscrollcommand has changed).
 */

void TtkScrollbarUpdateRequired(ScrollHandle h)
{
    h->flags |= SCROLL_UPDATE_REQUIRED;
}

/* TtkUpdateScrollInfo --
 * 	Call the layoutProc to update the scroll info first, last, and total.
 * 	Do it only if needed, that is when a redisplay is pending (which
 * 	indicates scroll info are possibly out of date).
 */

void TtkUpdateScrollInfo(ScrollHandle h)
{
    if (h->corePtr->flags & REDISPLAY_PENDING) {
        h->corePtr->widgetSpec->layoutProc(h->corePtr);
    }
}

/* TtkScrollviewCommand --
 * 	Widget [xy]view command implementation.
 *
 *  $w [xy]view -- return current view region
 *  $w [xy]view $index -- set topmost item
 *  $w [xy]view moveto $fraction
 *  $w [xy]view scroll $number $what -- scrollbar interface
 */
int TtkScrollviewCommand(
    Tcl_Interp *interp, int objc, Tcl_Obj *const objv[], ScrollHandle h)
{
    Scrollable *s = h->scrollPtr;
    int newFirst;

    TtkUpdateScrollInfo(h);
    newFirst = s->first;

    if (objc == 2) {
	Tcl_Obj *result[2];









	result[0] = Tcl_NewDoubleObj((double)s->first / s->total);
	result[1] = Tcl_NewDoubleObj((double)s->last / s->total);
	Tcl_SetObjResult(interp, Tcl_NewListObj(2, result));
	return TCL_OK;
    } else if (objc == 3) {
	if (Tcl_GetIntFromObj(interp, objv[2], &newFirst) != TCL_OK) {
	    return TCL_ERROR;
	}
    } else {
	double fraction;
	int count;









	switch (Tk_GetScrollInfoObj(interp, objc, objv, &fraction, &count)) {
	    case TK_SCROLL_ERROR:
		return TCL_ERROR;
	    case TK_SCROLL_MOVETO:
		newFirst = (int) ((fraction * s->total) + 0.5);
		break;
	    case TK_SCROLL_UNITS:
		newFirst = s->first + count;
		break;
	    case TK_SCROLL_PAGES: {
		int perPage = s->last - s->first;	/* @@@ */
		newFirst = s->first + count * perPage;
		break;
	    }
	}
    }

    TtkScrollTo(h, newFirst, 0);

    return TCL_OK;
}

void TtkScrollTo(ScrollHandle h, int newFirst, int updateScrollInfo)
{
    Scrollable *s = h->scrollPtr;


    if (updateScrollInfo) {

        TtkUpdateScrollInfo(h);


    }

    if (newFirst >= s->total)
	newFirst = s->total - 1;
    if (newFirst > s->first && s->last >= s->total) /* don't scroll past end */
	newFirst = s->first;
    if (newFirst < 0)
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Changes to generic/ttk/ttkTreeview.c.
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    }
    tv->tree.yscroll.total = CountRows(tv->tree.root) - 1;

    /* Make sure item is visible:
     */
    rowNumber = RowNumber(tv, item);
    if (rowNumber < tv->tree.yscroll.first) {
	TtkScrollTo(tv->tree.yscrollHandle, rowNumber);
    } else if (rowNumber >= tv->tree.yscroll.last) {
	TtkScrollTo(tv->tree.yscrollHandle,
	    tv->tree.yscroll.first + (1+rowNumber - tv->tree.yscroll.last));
    }

    return TCL_OK;
}

/*------------------------------------------------------------------------
 * +++ Widget commands -- interactive column resize








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    }
    tv->tree.yscroll.total = CountRows(tv->tree.root) - 1;

    /* Make sure item is visible:
     */
    rowNumber = RowNumber(tv, item);
    if (rowNumber < tv->tree.yscroll.first) {
	TtkScrollTo(tv->tree.yscrollHandle, rowNumber, 1);
    } else if (rowNumber >= tv->tree.yscroll.last) {
	TtkScrollTo(tv->tree.yscrollHandle,
	    tv->tree.yscroll.first + (1+rowNumber - tv->tree.yscroll.last), 1);
    }

    return TCL_OK;
}

/*------------------------------------------------------------------------
 * +++ Widget commands -- interactive column resize
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Changes to generic/ttk/ttkWidget.h.
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MODULE_SCOPE ScrollHandle TtkCreateScrollHandle(WidgetCore *, Scrollable *);
MODULE_SCOPE void TtkFreeScrollHandle(ScrollHandle);

MODULE_SCOPE int TtkScrollviewCommand(
    Tcl_Interp *interp, int objc, Tcl_Obj *const objv[], ScrollHandle);

MODULE_SCOPE void TtkScrollTo(ScrollHandle, int newFirst);
MODULE_SCOPE void TtkScrolled(ScrollHandle, int first, int last, int total);
MODULE_SCOPE void TtkScrollbarUpdateRequired(ScrollHandle);

/*
 * Tag sets (work in progress, half-baked)
 */









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MODULE_SCOPE ScrollHandle TtkCreateScrollHandle(WidgetCore *, Scrollable *);
MODULE_SCOPE void TtkFreeScrollHandle(ScrollHandle);

MODULE_SCOPE int TtkScrollviewCommand(
    Tcl_Interp *interp, int objc, Tcl_Obj *const objv[], ScrollHandle);

MODULE_SCOPE void TtkScrollTo(ScrollHandle, int newFirst, int updateScrollInfo);
MODULE_SCOPE void TtkScrolled(ScrollHandle, int first, int last, int total);
MODULE_SCOPE void TtkScrollbarUpdateRequired(ScrollHandle);

/*
 * Tag sets (work in progress, half-baked)
 */
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