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<hr>
<a name="winfo-1"></a>
<h3 class="section">3.24 winfo</h3>

<p>winfo \- Return window-related information
</p><a name="Synopsis-36"></a>
<h4 class="unnumberedsubsec">Synopsis</h4>
<p><b>winfo</b><span class="roman"> </span><i>option </i><span class="roman">?</span><i>arg arg ...</i>?
</p>
<a name="Description-35"></a>
<h4 class="unnumberedsubsec">Description</h4>

<p>The <b>winfo</b> command is used to retrieve information about windows
managed by Tk.  It can take any of a number of different forms,
depending on the <i>option</i> argument.  The legal forms are:
</p>
<dl compact="compact">
<dt><b>winfo :atom </b><i>name</i></dt>
<dd><p>Returns a decimal string giving the integer identifier for the
atom whose name is <i>name</i>.  If no atom exists with the name
<i>name</i> then a new one is created.
</p></dd>
<dt><b>winfo :atomname </b><i>id</i></dt>
<dd><p>Returns the textual name for the atom whose integer identifier is
<i>id</i>.
This command is the inverse of the <b>winfo :atom</b> command.
Generates an error if no such atom exists.
</p></dd>
<dt><b>winfo :cells </b><i>window</i></dt>
<dd><p>Returns a decimal string giving the number of cells in the
color map for <i>window</i>.
</p></dd>
<dt><b>winfo :children </b><i>window</i></dt>
<dd><p>Returns a list containing the path names of all the children
of <i>window</i>.  Top-level windows are returned as children
of their logical parents.
</p></dd>
<dt><b>winfo :class </b><i>window</i></dt>
<dd><p>Returns the class name for <i>window</i>.
</p></dd>
<dt><b>winfo :containing </b><i>rootX rootY</i></dt>
<dd><p>Returns the path name for the window containing the point given
by <i>rootX</i><span class="roman"> and </span><i>rootY</i>.
<i>RootX</i><span class="roman"> and </span><i>rootY</i> are specified in screen units (i.e.
any form acceptable to <b>Tk_GetPixels</b>) in the coordinate
system of the root window (if a virtual-root window manager is in
use then the coordinate system of the virtual root window is used).
If no window in this application contains the point then an empty
string is returned.
In selecting the containing window, children are given higher priority
than parents and among siblings the highest one in the stacking order is
chosen.
</p></dd>
<dt><b>winfo :depth </b><i>window</i></dt>
<dd><p>Returns a decimal string giving the depth of <i>window</i> (number
of bits per pixel).
</p></dd>
<dt><b>winfo :exists </b><i>window</i></dt>
<dd><p>Returns 1 if there exists a window named <i>window</i>, 0 if no such
window exists.
</p></dd>
<dt><b>winfo :fpixels </b><i>window</i><span class="roman"> </span><i>number</i></dt>
<dd><p>Returns a floating-point value giving the number of pixels
in <i>window</i><span class="roman"> corresponding to the distance given by </span><i>number</i>.
<i>Number</i> may be specified in any of the forms acceptable
to <b>Tk_GetScreenMM</b>, such as &ldquo;2.0c&rdquo; or &ldquo;1i&rdquo;.
The return value may be fractional;  for an integer value, use
<b>winfo :pixels</b>.
</p></dd>
<dt><b>winfo :geometry </b><i>window</i></dt>
<dd><p>Returns the geometry for <i>window</i>, in the form
<i>width</i><b>x</b><i>height</i><b>+</b><i>x</i><b>+</b><i>y</i>.  All dimensions are
in pixels.
</p></dd>
<dt><b>winfo :height </b><i>window</i></dt>
<dd><p>Returns a decimal string giving <i>window</i>&rsquo;s height in pixels.
When a window is first created its height will be 1 pixel;  the
height will eventually be changed by a geometry manager to fulfill
the window&rsquo;s needs.
If you need the true height immediately after creating a widget,
invoke <b>update</b> to force the geometry manager to arrange it,
or use <b>winfo :reqheight</b> to get the window&rsquo;s requested height
instead of its actual height.
</p></dd>
<dt><b>winfo :id </b><i>window</i></dt>
<dd><p>Returns a hexadecimal string indicating the X identifier for <i>window</i>.
</p></dd>
<dt><b>winfo :interps</b></dt>
<dd><p>Returns a list whose members are the names of all Tcl interpreters
(e.g. all Tk-based applications) currently registered for the
display of the invoking application.
</p></dd>
<dt><b>winfo :ismapped </b><i>window</i></dt>
<dd><p>Returns <b>1</b><span class="roman"> if </span><i>window</i><span class="roman"> is currently mapped, </span><b>0</b> otherwise.
</p></dd>
<dt><b>winfo :name </b><i>window</i></dt>
<dd><p>Returns <i>window</i>&rsquo;s name (i.e. its name within its parent, as opposed
to its full path name).
The command <b>winfo :name .</b> will return the name of the application.
</p></dd>
<dt><b>winfo :parent </b><i>window</i></dt>
<dd><p>Returns the path name of <i>window</i>&rsquo;s parent, or an empty string
if <i>window</i> is the main window of the application.
</p></dd>
<dt><b>winfo :pathname </b><i>id</i></dt>
<dd><p>Returns the path name of the window whose X identifier is <i>id</i>.
<i>Id</i> must be a decimal, hexadecimal, or octal integer and must
correspond to a window in the invoking application.
</p></dd>
<dt><b>winfo :pixels </b><i>window</i><span class="roman"> </span><i>number</i></dt>
<dd><p>Returns the number of pixels in <i>window</i> corresponding
to the distance given by <i>number</i>.
<i>Number</i> may be specified in any of the forms acceptable
to <b>Tk_GetPixels</b>, such as &ldquo;2.0c&rdquo; or &ldquo;1i&rdquo;.
The result is rounded to the nearest integer value;  for a
fractional result, use <b>winfo :fpixels</b>.
</p></dd>
<dt><b>winfo :reqheight </b><i>window</i></dt>
<dd><p>Returns a decimal string giving <i>window</i>&rsquo;s requested height,
in pixels.  This is the value used by <i>window</i>&rsquo;s geometry
manager to compute its geometry.
</p></dd>
<dt><b>winfo :reqwidth </b><i>window</i></dt>
<dd><p>Returns a decimal string giving <i>window</i>&rsquo;s requested width,
in pixels.  This is the value used by <i>window</i>&rsquo;s geometry
manager to compute its geometry.
</p></dd>
<dt><b>winfo :rgb </b><i>window color</i></dt>
<dd><p>Returns a list containing three decimal values, which are the
red, green, and blue intensities that correspond to <i>color</i> in
the window given by <i>window</i><span class="roman">.  </span><i>Color</i>
may be specified in any of the forms acceptable for a color
option.
</p></dd>
<dt><b>winfo :rootx </b><i>window</i></dt>
<dd><p>Returns a decimal string giving the x-coordinate, in the root
window of the screen, of the
upper-left corner of <i>window</i><span class="roman">&rsquo;s border (or </span><i>window</i> if it
has no border).
</p></dd>
<dt><b>winfo :rooty </b><i>window</i></dt>
<dd><p>Returns a decimal string giving the y-coordinate, in the root
window of the screen, of the
upper-left corner of <i>window</i><span class="roman">&rsquo;s border (or </span><i>window</i> if it
has no border).
</p></dd>
<dt><b>winfo :screen </b><i>window</i></dt>
<dd><p>Returns the name of the screen associated with <i>window</i>, in
the form <i>displayName</i><span class="roman">.</span><i>screenIndex</i>.
</p></dd>
<dt><b>winfo :screencells </b><i>window</i></dt>
<dd><p>Returns a decimal string giving the number of cells in the default
color map for <i>window</i>&rsquo;s screen.
</p></dd>
<dt><b>winfo :screendepth </b><i>window</i></dt>
<dd><p>Returns a decimal string giving the depth of the root window
of <i>window</i>&rsquo;s screen (number of bits per pixel).
</p></dd>
<dt><b>winfo :screenheight </b><i>window</i></dt>
<dd><p>Returns a decimal string giving the height of <i>window</i>&rsquo;s screen,
in pixels.
</p></dd>
<dt><b>winfo :screenmmheight </b><i>window</i></dt>
<dd><p>Returns a decimal string giving the height of <i>window</i>&rsquo;s screen,
in millimeters.
</p></dd>
<dt><b>winfo :screenmmwidth </b><i>window</i></dt>
<dd><p>Returns a decimal string giving the width of <i>window</i>&rsquo;s screen,
in millimeters.
</p></dd>
<dt><b>winfo :screenvisual </b><i>window</i></dt>
<dd><p>Returns one of the following strings to indicate the default visual
type for <i>window</i><span class="roman">&rsquo;s screen: </span><b>directcolor</b><span class="roman">, </span><b>grayscale</b>,
<b>pseudocolor</b><span class="roman">, </span><b>staticcolor</b><span class="roman">, </span><b>staticgray</b>, or
<b>truecolor</b>.
</p></dd>
<dt><b>winfo :screenwidth </b><i>window</i></dt>
<dd><p>Returns a decimal string giving the width of <i>window</i>&rsquo;s screen,
in pixels.
</p></dd>
<dt><b>winfo :toplevel </b><i>window</i></dt>
<dd><p>Returns the path name of the top-level window containing <i>window</i>.
</p></dd>
<dt><b>winfo :visual </b><i>window</i></dt>
<dd><p>Returns one of the following strings to indicate the visual
type for <i>window</i><span class="roman">: </span><b>directcolor</b><span class="roman">, </span><b>grayscale</b>,
<b>pseudocolor</b><span class="roman">, </span><b>staticcolor</b><span class="roman">, </span><b>staticgray</b>, or
<b>truecolor</b>.
</p></dd>
<dt><b>winfo :vrootheight </b><i>window</i></dt>
<dd><p>Returns the height of the virtual root window associated with <i>window</i>
if there is one;  otherwise returns the height of <i>window</i>&rsquo;s screen.
</p></dd>
<dt><b>winfo :vrootwidth </b><i>window</i></dt>
<dd><p>Returns the width of the virtual root window associated with <i>window</i>
if there is one;  otherwise returns the width of <i>window</i>&rsquo;s screen.
</p></dd>
<dt><b>winfo :vrootx </b><i>window</i></dt>
<dd><p>Returns the x-offset of the virtual root window associated with <i>window</i>,
relative to the root window of its screen.
This is normally either zero or negative.
Returns 0 if there is no virtual root window for <i>window</i>.
</p></dd>
<dt><b>winfo :vrooty </b><i>window</i></dt>
<dd><p>Returns the y-offset of the virtual root window associated with <i>window</i>,
relative to the root window of its screen.
This is normally either zero or negative.
Returns 0 if there is no virtual root window for <i>window</i>.
</p></dd>
<dt><b>winfo :width </b><i>window</i></dt>
<dd><p>Returns a decimal string giving <i>window</i>&rsquo;s width in pixels.
When a window is first created its width will be 1 pixel;  the
width will eventually be changed by a geometry manager to fulfill
the window&rsquo;s needs.
If you need the true width immediately after creating a widget,
invoke <b>update</b> to force the geometry manager to arrange it,
or use <b>winfo :reqwidth</b> to get the window&rsquo;s requested width
instead of its actual width.
</p></dd>
<dt><b>winfo :x </b><i>window</i></dt>
<dd><p>Returns a decimal string giving the x-coordinate, in <i>window</i>&rsquo;s
parent, of the
upper-left corner of <i>window</i><span class="roman">&rsquo;s border (or </span><i>window</i> if it
has no border).
</p></dd>
<dt><b>winfo :y </b><i>window</i></dt>
<dd><p>Returns a decimal string giving the y-coordinate, in <i>window</i>&rsquo;s
parent, of the
upper-left corner of <i>window</i><span class="roman">&rsquo;s border (or </span><i>window</i> if it
has no border).
</p>
</dd>
</dl>
<a name="Keywords-38"></a>
<h4 class="unnumberedsubsec">Keywords</h4>
<p>atom, children, class, geometry, height, identifier, information, interpreters,
mapped, parent, path name, screen, virtual root, width, window
</p><hr>
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