merge trunk

11 files changed, 267 insertions, 67 deletions

diff --git a/doc/CrtItemType.3 b/doc/CrtItemType.3
index f9198f3..1bfb20f 100644
--- a/doc/CrtItemType.3
+++ b/doc/CrtItemType.3
@@ -83,6 +83,9 @@ typedef struct Tk_ItemType {
     Tk_ItemInsertProc *\fIinsertProc\fR;
     Tk_ItemDCharsProc *\fIdCharsProc\fR;
     Tk_ItemType *\fInextPtr\fR;
+.VS "8.7, TIP164"
+    Tk_ItemRotateProc *\fIrotateProc\fR;
+.VE "8.7, TIP164"
 } \fBTk_ItemType\fR;
 .CE
 .PP
@@ -549,6 +552,46 @@ and \fIdeltaX\fR and \fIdeltaY\fR give the amounts that should be
 added to each x and y coordinate within the item.
 The type manager should adjust the item's coordinates and
 update the bounding box in the item's header.
+.SS ROTATEPROC
+.VS "8.7, TIP164"
+.PP
+\fItypePtr\->rotateProc\fR is invoked by Tk to rotate a canvas item
+during the \fBrotate\fR widget command.
+The procedure must match the following prototype:
+.PP
+.CS
+typedef void \fBTk_ItemRotateProc\fR(
+        Tk_Canvas \fIcanvas\fR,
+        Tk_Item *\fIitemPtr\fR,
+        double \fIoriginX\fR,
+        double \fIoriginY\fR,
+        double \fIangleRad\fR);
+.CE
+.PP
+The \fIcanvas\fR and \fIitemPtr\fR arguments have the usual meaning.
+\fIoriginX\fR and \fIoriginY\fR specify an origin relative to which
+the item is to be rotated, and \fIangleRad\fR gives the anticlockwise
+rotation to be applied in radians.
+The item should adjust the coordinates of its control points so that where
+they used to have coordinates \fIx\fR and \fIy\fR, they will have new
+coordinates \fIx\(fm\fR and \fIy\(fm\fR, where
+.PP
+.CS
+\fIrelX\fR = \fIx\fR - \fIoriginX\fR
+\fIrelY\fR = \fIy\fR - \fIoriginY\fR
+\fIx\(fm\fR = \fIoriginX\fR + \fIrelX\fR \(mu cos(\fIangleRad\fR) + \fIrelY\fR \(mu sin(\fIangleRad\fR)
+\fIy\(fm\fR = \fIoriginY\fR \(mi \fIrelX\fR \(mu sin(\fIangleRad\fR) + \fIrelY\fR \(mu cos(\fIangleRad\fR)
+.CE
+.PP
+The control points for an item are not necessarily the coordinates provided to
+the item when it is created (or via the \fItypePtr\->coordProc\fR), but could
+instead be derived from them.
+\fIrotateProc\fR must also update the bounding box in the item's header.
+.PP
+Item types do not need to provide a \fItypePtr\->rotateProc\fR. If the
+\fItypePtr\->rotateProc\fR is NULL, the \fItypePtr\->coordProc\fR will be
+used instead to retrieve and update the list of coordinates.
+.VE "8.7, TIP164"
 .SS INDEXPROC
 .PP
 \fItypePtr\->indexProc\fR is invoked by Tk to translate a string
diff --git a/doc/GetScroll.3 b/doc/GetScroll.3
index 70145aa..c0b302d 100644
--- a/doc/GetScroll.3
+++ b/doc/GetScroll.3
@@ -15,10 +15,10 @@ Tk_GetScrollInfoObj, Tk_GetScrollInfo \- parse arguments for scrolling commands
 \fB#include <tk.h>\fR
 .sp
 int
-\fBTk_GetScrollInfoObj(\fIinterp, objc, objv, dblPtr, intPtr\fB)\fR
+\fBTk_GetScrollInfoObj(\fIinterp, objc, objv, fractionPtr, stepsPtr\fB)\fR
 .sp
 int
-\fBTk_GetScrollInfo(\fIinterp, argc, argv, dblPtr, intPtr\fB)\fR
+\fBTk_GetScrollInfo(\fIinterp, argc, argv, fractionPtr, stepsPtr\fB)\fR
 .SH ARGUMENTS
 .AS "Tcl_Interp" *fractionPtr
 .AP Tcl_Interp *interp in
diff --git a/doc/canvas.n b/doc/canvas.n
index fa7843d..424c3ca 100644
--- a/doc/canvas.n
+++ b/doc/canvas.n
@@ -220,8 +220,12 @@ for scrolling.
 Canvases do not support scaling or rotation of the canvas coordinate
 system relative to the window coordinate system.
 .PP
-Individual items may be moved or scaled using widget commands
-described below, but they may not be rotated.
+Individual items may be moved, scaled
+.VS "8.7, TIP164"
+or rotated
+.VE "8.7, TIP164"
+using widget commands
+described below.
 .PP
 Note that the default origin of the canvas's visible area is
 coincident with the origin for the whole window as that makes bindings
@@ -674,13 +678,12 @@ mapped.
 This command returns an empty string.
 .TP
 \fIpathName \fBimove \fItagOrId index x y\fR
-.VS 8.6
+.
 This command causes the \fIindex\fR'th coordinate of each of the items
 indicated by \fItagOrId\fR to be relocated to the location (\fIx\fR,\fIy\fR).
 Each item interprets \fIindex\fR independently according to the rules
 described in \fBINDICES\fR above. Out of the standard set of items, only line
 and polygon items may have their coordinates relocated this way.
-.VE 8.6
 .TP
 \fIpathName \fBindex \fItagOrId index\fR
 .
@@ -766,7 +769,7 @@ each point associated with the item.
 This command returns an empty string.
 .TP
 \fIpathName \fBmoveto \fItagOrId xPos yPos\fR
-.VS 8.6
+.
 Move the items given by \fItagOrId\fR in the canvas coordinate
 space so that the first coordinate pair of the bottommost item with
 tag \fItagOrId\fR is located at
@@ -775,7 +778,6 @@ the empty string, in which case the corresponding coordinate
 will be unchanged. All items matching
 \fItagOrId\fR remain in the same positions relative to each other.
 This command returns an empty string.
-.VE 8.6
 .TP
 \fIpathName \fBpostscript \fR?\fIoption value option value ...\fR?
 .
@@ -961,7 +963,7 @@ determined by the \fBraise\fR command and \fBlower\fR command, not the
 .RE
 .TP
 \fIpathName \fBrchars \fItagOrId first last string\fR
-.VS 8.6
+.
 This command causes the text or coordinates between \fIfirst\fR and \fIlast\fR
 for each of the items indicated by \fItagOrId\fR to be replaced by
 \fIstring\fR. Each item interprets \fIfirst\fR and \fIlast\fR independently
@@ -970,7 +972,27 @@ set of items, text items support this operation by altering their text as
 directed, and line and polygon items support this operation by altering their
 coordinate list (in which case \fIstring\fR should be a list of coordinates to
 use as a replacement). The other items ignore this operation.
-.VE 8.6
+.TP
+\fIpathName \fBrotate \fItagOrId xOrigin yOrigin angle\fR
+.VS "8.7, TIP164"
+Rotate the coordinates of all of the items given by \fItagOrId\fR in canvas
+coordinate space.
+\fIXOrigin\fR and \fIyOrigin\fR identify the origin for the rotation
+operation and \fIangle\fR identifies the amount to rotate the coordinates
+anticlockwise, in degrees. (Negative values rotate clockwise.)
+This command returns an empty string.
+.RS
+.PP
+Implementation note: not all item types work the same with rotations. In
+particular,\fB bitmap\fR,\fB image\fR,\fB text\fR and\fB window\fR items only
+rotate their anchor points and do not rotate the items themselves about those
+points, and the \fBarc\fR, \fBoval\fR and \fBrectangle\fR types rotate about a
+computed center point instead of moving the bounding box coordinates directly.
+.PP
+Some items (currently \fBarc\R and\fB text\fR) have angles in their options;
+this command \fIdoes not\fR affect those options.
+.RE
+.VE "8.7, TIP164"
 .TP
 \fIpathName \fBscale \fItagOrId xOrigin yOrigin xScale yScale\fR
 .
@@ -1834,13 +1856,12 @@ The following standard options are supported by text items:
 The following extra options are supported for text items:
 .TP
 \fB\-angle \fIrotationDegrees\fR
-.VS 8.6
+.
 \fIRotationDegrees\fR tells how many degrees to rotate the text anticlockwise
 about the positioning point for the text; it may have any floating-point value
 from 0.0 to 360.0. For example, if \fIrotationDegrees\fR is \fB90\fR, then the
 text will be drawn vertically from bottom to top.
 This option defaults to \fB0.0\fR.
-.VE 8.6
 .TP
 \fB\-font \fIfontName\fR
 Specifies the font to use for the text item.
diff --git a/doc/colors.n b/doc/colors.n
index dc7007b..0d3c162 100644
--- a/doc/colors.n
+++ b/doc/colors.n
@@ -784,9 +784,10 @@ YellowGreen	154	205 	50
 .TP
 \fBMac OS X\fR
 .
-On Mac OS X, the following additional system colors are available
-(note that the actual color values depend on the currently active OS theme,
-and typically many of these will in fact be patterns rather than pure colors):
+On macOS, the following additional system colors are available.
+This first group contains all colors available in the HIToolbox library.
+(Note that in some cases the actual color values may depend on the
+current Appearance.)
 .RS
 .DS
 systemActiveAreaFill
@@ -900,6 +901,7 @@ systemScrollBarDelimiterActive
 systemScrollBarDelimiterInactive
 systemSecondaryGroupBoxBackground
 systemSecondaryHighlightColor
+systemSelectedTabTextColor
 systemSheetBackground
 systemSheetBackgroundOpaque
 systemSheetBackgroundTransparent
@@ -925,7 +927,40 @@ systemWindowHeaderBackground
 systemWindowHeaderInactiveText
 .DE
 .RE
+.
+The second group of MacOS colors below are based on Apple's "semantic"
+NScolors.  On OSX 10.14 (Mojave) and later these colors change value
+when Dark Mode is enabled.  However, the change is only observable
+when the Apple window manager is drawing to the screen. So the
+\fBwinfo rgb\fR command will return the color coordinates used in the
+standard Aqua mode, even if Dark Mode has been selected in the system
+preferences.  The numbered systemWindowBackgroundColors are used in
+the \fBttk::notebook\fR and \fBttk::labelframe\fR widgets to provide a
+contrasting background.  Each numbered color constrasts with its
+predecessor.
+.RS
+.DS
+systemControlAccentColor
+systemControlTextColor
+systemDisabledControlTextColor
+systemLabelColor
+systemSelectedTextBackgroundColor
+systemSelectedTextColor
+systemTextBackgroundColor
+systemTextColor
+systemWindowBackgroundColor
+systemWindowBackgroundColor1
+systemWindowBackgroundColor2
+systemWindowBackgroundColor3
+systemWindowBackgroundColor4
+systemWindowBackgroundColor5
+systemWindowBackgroundColor6
+systemWindowBackgroundColor7
+.DE
+.RE
 .TP
+
+
 \fBWindows\fR
 .
 On Windows, the following additional system colors are available
diff --git a/doc/photo.n b/doc/photo.n
index d875098..2f6076e 100644
--- a/doc/photo.n
+++ b/doc/photo.n
@@ -551,6 +551,59 @@ an additional alpha filtering for the overall image, which allows the
 background on which the image is displayed to show through.  This
 usually also has the effect of desaturating the image.  The
 \fIalphaValue\fR must be between 0.0 and 1.0.
+.TP
+\fBsvg \-dpi\fI dpiValue\fB \-scale\fI scaleValue\fB \-unit\fI unitValue\fR
+.
+\fIdpiValue\fR is used in conversion between given coordinates and
+screen resolution. The value must be greater than 0 and the default
+value is 96.
+\fIscaleValue\fR is used to scale the resulting image. The value must
+be greater than 0 and the default value is 1.
+\fIunitValue\fR is the unit of all coordinates in the SVG data.
+Available units are px (default, coordinates in pixel), pt (1/72 inch),
+pc (12 pt), mm , cm and in.
+The svg format supports a wide range of SVG features, but the
+full SVG standard is not available, for instance the 'text' feature
+is missing and silently ignores when reading the SVG data.
+The supported SVG features are:
+.
+.RS
+\fB elements:\fR g, path, rect, circle, ellipse, line, polyline, polygon,
+linearGradient, radialGradient, stop, defs, svg, style
+.PP
+\fB attributes:\fR width, height, viewBox,
+preserveAspectRatio with none, xMin, xMid, xMax, yMin, yMid, yMax, slice
+.PP
+\fB gradient attributes:\fR gradientUnits with objectBoundingBox,
+gradientTransform, cx, cy, r fx, fy x1, y1, x2, y2
+spreadMethod with pad, reflect or repeat,
+xlink:href
+.PP
+\fB poly attributes: \fR points
+.PP
+\fB line attributes: \fR x1, y1, x2, y2
+.PP
+\fB ellipse attributes: \fR cx, cy, rx, ry
+.PP
+\fB circle attributes: \fR cx, cy, r
+.PP
+\fB rectangle attributes: \fR x, y, width, height, rx, ry
+.PP
+\fB path attributes: \fR d with m, M, l, L, h, H, v, V, c, C, s, S, q, Q, t, T, a, A, z, Z
+.PP
+\fB style attributes: \fR display with none, visibility, hidden, visible,
+fill with nonzero and evenodd, opacity, fill-opacity,
+stroke, stroke-width, stroke-dasharray, stroke-dashoffset, stroke-opacity,
+stroke-linecap with butt, round and square,
+stroke-linejoin with miter, round and  bevel, stroke-miterlimit
+fill-rule, font-size,
+transform with matrix, translate, scale, rotate, skewX and  skewY,
+stop-color, stop-opacity, offset, id, class
+.RE
+.
+Currently only SVG images reading and conversion into (pixel-based
+format) photos is supported: Tk does not (yet) support bundling photo
+images in SVG vector graphics.
 .VE 8.6
 .VS 8.7
 .SH "COLOR FORMATS"
diff --git a/doc/ttk_combobox.n b/doc/ttk_combobox.n
index 37acf19..24bf8d9 100644
--- a/doc/ttk_combobox.n
+++ b/doc/ttk_combobox.n
@@ -124,6 +124,8 @@ are:
 .PP
 \fB\-arrowcolor\fP \fIcolor\fP
 .br
+\fB\-arrowsize\fP \fIamount\fP
+.br
 \fB\-background\fP \fIcolor\fP
 .br
 \fB\-bordercolor\fP \fIcolor\fP
diff --git a/doc/ttk_entry.n b/doc/ttk_entry.n
index 1c182ff..cb58005 100644
--- a/doc/ttk_entry.n
+++ b/doc/ttk_entry.n
@@ -222,52 +222,13 @@ 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.
-.TP
-\fIpathName \fBxview \fIargs\fR
-This command is used to query and change the horizontal position of the
-text 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 entry's text is off-screen to the left, the middle 40% is visible
-in the window, and 40% of the text 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 character 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 text 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
 .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
+\fBinstate\fR	\fBstate\fR	\fBxview\fR
 .DE
 .SH VALIDATION
 .PP
diff --git a/doc/ttk_scale.n b/doc/ttk_scale.n
index 4e16999..f8f5072 100644
--- a/doc/ttk_scale.n
+++ b/doc/ttk_scale.n
@@ -93,7 +93,7 @@ corresponding to the current value of the \fB\-value\fR option if \fIvalue\fR
 is omitted.
 .SH "STYLING OPTIONS"
 .PP
-The class name for a \fBttk::scale\fP is \fBTProgressbar\fP.
+The class name for a \fBttk::scale\fP is \fBTScale\fP.
 .PP
 Dynamic states: \fBactive\fP.
 .PP
diff --git a/doc/ttk_scrollbar.n b/doc/ttk_scrollbar.n
index 49681a1..bd80760 100644
--- a/doc/ttk_scrollbar.n
+++ b/doc/ttk_scrollbar.n
@@ -76,7 +76,7 @@ Modify or query the widget state; see \fIttk::widget(n)\fR.
 .SH "INTERNAL COMMANDS"
 .PP
 The following widget commands are used internally
-by the TScrollbar widget class bindings.
+by the \fBTScrollbar\fP widget class bindings.
 .TP
 \fIpathName \fBdelta \fIdeltaX deltaY\fR
 Returns a real number indicating the fractional change in
@@ -153,6 +153,7 @@ grid $f.vsb \-row 0 \-column 1 \-sticky nsew
 grid $f.hsb \-row 1 \-column 0 \-sticky nsew
 grid columnconfigure $f 0 \-weight 1
 grid rowconfigure $f 0 \-weight 1
+pack $f
 .CE
 .SH "STYLING OPTIONS"
 .PP
@@ -160,20 +161,25 @@ The class name for a \fBttk::scrollbar\fP is \fBTScrollbar\fP.
 .PP
 Dynamic states: \fBactive\fP, \fBdisabled\fP.
 .PP
-\fBTScrollbar\fP styling options configurable with \fBttk::style\fP
-are:
+\fBTScrollbar\fP (or more specifically \fBVertical.TScrollbar\fP and
+\fBHorizontal.TScrollbar\fP) styling options that are configurable with
+\fBttk::style\fP are:
 .PP
 \fB\-arrowcolor\fP \fIcolor\fP
 .br
+\fB\-arrowsize\fP \fIamount\fP
+.br
 \fB\-background\fP \fIcolor\fP
 .br
 \fB\-bordercolor\fP \fIcolor\fP
 .br
-\fB\-darkcolor\fP \fIcolor\fP
+\fB\-darkcolor\fP \fIcolor\fP (color of the dark part of the 3D relief)
 .br
 \fB\-foreground\fP \fIcolor\fP
 .br
-\fB\-lightcolor\fP \fIcolor\fP
+\fB\-gripcount\fP \fIcount\fP (number of lines on the thumb)
+.br
+\fB\-lightcolor\fP \fIcolor\fP (color of the light part of the 3D relief)
 .br
 \fB\-troughcolor\fP \fIcolor\fP
 .PP
diff --git a/doc/ttk_treeview.n b/doc/ttk_treeview.n
index 96565a3..5fd5e6d 100644
--- a/doc/ttk_treeview.n
+++ b/doc/ttk_treeview.n
@@ -388,12 +388,13 @@ 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
-.TP
-\fIpathName \fBxview \fIargs\fR
-Standard command for horizontal scrolling; see \fIwidget(n)\fR.
-.TP
-\fIpathName \fByview \fIargs\fR
-Standard command for vertical scrolling; see \fIttk::widget(n)\fR.
+.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
diff --git a/doc/ttk_widget.n b/doc/ttk_widget.n
index 9e9f3db..b1c280d 100644
--- a/doc/ttk_widget.n
+++ b/doc/ttk_widget.n
@@ -224,6 +224,84 @@ 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: