Tk Source Code

.SH NAME
Tk_GetScrollInfoObj, Tk_GetScrollInfo \- parse arguments for scrolling commands
.SH SYNOPSIS
.nf
\fB#include <tk.h>\fR
.sp
int
\fBTk_GetScrollInfoObj(\fIinterp, objc, objv, fractionPtr, stepsPtr\fB)\fR
.sp
int
\fBTk_GetScrollInfo(\fIinterp, argc, argv, fractionPtr, stepsPtr\fB)\fR
.SH ARGUMENTS
.AS "Tcl_Interp" *fractionPtr
.AP Tcl_Interp *interp in
Interpreter to use for error reporting.
.AP int objc in
Number of Tcl_Obj's in \fIobjv\fR array.
.AP "Tcl_Obj *const" objv[] in

.TP
\fIpathName \fBvalidate\fR
Force revalidation, independent of the conditions specified
by the \fB\-validate\fR option.
Returns 0 if validation fails, 1 if it succeeds.
Sets or clears the \fBinvalid\fR state accordingly.
See \fBVALIDATION\fR below for more details.







































.PP
The entry widget also supports the following generic \fBttk::widget\fR
widget subcommands (see \fIttk::widget(n)\fR for details):
.DS
.ta 5.5c 11c
\fBcget\fR	\fBconfigure\fR	\fBidentify\fR
\fBinstate\fR	\fBstate\fR	\fBxview\fR
.DE
.SH VALIDATION
.PP
The \fB\-validate\fR, \fB\-validatecommand\fR, and \fB\-invalidcommand\fR
options are used to enable entry widget validation.
.SS "VALIDATION MODES"
.PP

.TP
\fIpathName \fBtag remove \fItag\fR ?\fIitems\fR?
Removes the specified \fItag\fR from each of the listed \fIitems\fR.
If \fIitems\fR is omitted, removes \fItag\fR from each item in the tree.
If \fItag\fR is not present for a particular item,
then the \fB\-tags\fR for that item are unchanged.
.RE
.PP
The treeview widget also supports the following generic \fBttk::widget\fR
widget subcommands (see \fIttk::widget(n)\fR for details):
.DS
.ta 5.5c 11c
\fBxview\fR	\fByview\fR

.DE
.SH "ITEM OPTIONS"
.PP
The following item options may be specified for items
in the \fBinsert\fR and \fBitem\fR widget commands.
.OP \-text text Text
The textual label to display for the item.
.OP \-image image Image

set changes [\fIpathName \fRstate \fIspec\fR]
\fIpathName \fRstate $changes
.CE
will restore \fIpathName\fR to the original state.
If \fIstateSpec\fR is not specified,
returns a list of the currently-enabled state flags.
.RE
.TP
\fIpathName \fBxview \fIargs\fR
This command is used to query and change the horizontal position of the
content in the widget's window.  It can take any of the following
forms:
.RS
.TP
\fIpathName \fBxview\fR
Returns a list containing two elements.
Each element is a real fraction between 0 and 1; together they describe
the horizontal span that is visible in the window.
For example, if the first element is .2 and the second element is .6,
20% of the widget's content is off-screen to the left, the middle 40% is visible
in the window, and 40% of the content is off-screen to the right.
These are the same values passed to scrollbars via the \fB\-xscrollcommand\fR
option.
.TP
\fIpathName \fBxview\fR \fIindex\fR
Adjusts the view in the window so that the content given by \fIindex\fR
is displayed at the left edge of the window.
.TP
\fIpathName \fBxview moveto\fI fraction\fR
Adjusts the view in the window so that the character \fIfraction\fR of the
way through the content appears at the left edge of the window.
\fIFraction\fR must be a fraction between 0 and 1.
.TP
\fIpathName \fBxview scroll \fInumber what\fR
This command shifts the view in the window left or right according to
\fInumber\fR and \fIwhat\fR.
\fINumber\fR must be an integer.
\fIWhat\fR must be either \fBunits\fR or \fBpages\fR.
'\" or an abbreviation of one of these, but we don't document that.
If \fIwhat\fR is \fBunits\fR, the view adjusts left or right by
\fInumber\fR average-width characters on the display;  if it is
\fBpages\fR then the view adjusts by \fInumber\fR screenfuls.
If \fInumber\fR is negative then characters farther to the left
become visible;  if it is positive then characters farther to the right
become visible.
.RE
.TP
\fIpathName \fByview \fIargs\fR
This command is used to query and change the vertical position of the
content in the widget's window.  It can take any of the following
forms:
.RS
.TP
\fIpathName \fByview\fR
Returns a list containing two elements.
Each element is a real fraction between 0 and 1; together they describe
the vertical span that is visible in the window.
For example, if the first element is .2 and the second element is .6,
20% of the widget's content is off-screen to the top, the middle 40% is visible
in the window, and 40% of the content is off-screen to the bottom.
These are the same values passed to scrollbars via the \fB\-yscrollcommand\fR
option.
.TP
\fIpathName \fByview\fR \fIindex\fR
Adjusts the view in the window so that the content given by \fIindex\fR
is displayed at the top edge of the window.
.TP
\fIpathName \fByview moveto\fI fraction\fR
Adjusts the view in the window so that the item \fIfraction\fR of the
way through the content appears at the top edge of the window.
\fIFraction\fR must be a fraction between 0 and 1.
.TP
\fIpathName \fByview scroll \fInumber what\fR
This command shifts the view in the window up or down according to
\fInumber\fR and \fIwhat\fR.
\fINumber\fR must be an integer.
\fIWhat\fR must be either \fBunits\fR or \fBpages\fR.
'\" or an abbreviation of one of these, but we don't document that.
If \fIwhat\fR is \fBunits\fR, the view adjusts up or down by
\fInumber\fR average-width characters on the display;  if it is
\fBpages\fR then the view adjusts by \fInumber\fR screenfuls.
If \fInumber\fR is negative then items farther to the top
become visible;  if it is positive then items farther to the bottom
become visible.
.RE
.SH "WIDGET STATES"
The widget state is a bitmap of independent state flags.
Widget state flags include:
.TP
\fBactive\fR
.
The mouse cursor is over the widget

	if (x > maxWidth) {
	    x = maxWidth;
	    roundUp = 1;
	}
	*indexPtr = Tk_PointToChar(entryPtr->entry.textLayout,
		x - entryPtr->entry.layoutX, 0);

        TtkUpdateScrollInfo(entryPtr->entry.xscrollHandle);
	if (*indexPtr < entryPtr->entry.xscroll.first) {
	    *indexPtr = entryPtr->entry.xscroll.first;
	}

	/*
	 * Special trick:  if the x-position was off-screen to the right,
	 * round the index up to refer to the character just after the

{
    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 },

 * 	-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;

		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)
	newFirst = 0;

    }
    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

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 TtkUpdateScrollInfo(ScrollHandle h);
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)
 */

    }
    return $pos
}

## See $index -- Make sure that the character at $index is visible.
#
proc ttk::entry::See {w {index insert}} {

    set c [$w index $index]
    # @@@ OR: check [$w index left] / [$w index right]
    if {$c < [$w index @0] || $c >= [$w index @[winfo width $w]]} {
	$w xview $c
    }
}

    .e delete 0 end
    .e bbox 0
} -result [list $bd $bd 0 $ch]

test entry-3.2 "xview" -body {
    .e delete 0 end;
    .e insert end [string repeat "0" 40]
    set result [.e xview]
} -result {0.0 0.5}

test entry-3.3 "xview" -body {
    .e delete 0 end;
    .e insert end abcdefghijklmnopqrstuvwxyz
    .e xview end
    set result [.e index @0]
} -result {7}

test entry-3.4 "xview" -body {
    .e delete 0 end;
    .e insert end abcdefghijklmnopqrstuvwxyz
    .e xview moveto 1.0
    set result [.e index @0]
} -result {7}

test entry-3.5 "xview" -body {
    .e delete 0 end;
    .e insert end abcdefghijklmnopqrstuvwxyz
    .e xview scroll 5 units
    set result [.e index @0]
} -result {5}

test entry-3.6 "xview" -body {
    .e delete 0 end;
    .e insert end [string repeat abcdefghijklmnopqrstuvwxyz 5]
    .e xview scroll 2 pages
    set result [.e index @0]
} -result {40}

test entry-3.last "Series 3 cleanup" -body {
    destroy .e
}

# Selection tests:

}
test treeview-9.0 "scroll callback - empty tree" -body {
    .tv configure -yscrollcommand scrollcallback
    .tv delete [.tv children {}]
    update
    set ::scrolldata
} -result [list 0.0 1.0]

test treeview-9.1 "scrolling" -setup {
    pack [ttk::treeview .tree -show tree] -fill y
    for {set i 1} {$i < 100} {incr i} {
        .tree insert {} end -text $i
    }
} -body {
    .tree yview scroll 5 units
    .tree identify item 2 2
} -cleanup {
    destroy .tree
} -result {I006}

### identify tests:
#
proc identify* {tv comps args} {
    foreach {x y} $args {
	foreach comp $comps {
	    lappend result [$tv identify $comp $x $y]