1996-09-27 06:29:02 -04:00
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<HTML><HEAD><TITLE>Tk Built-In Commands - place manual page</TITLE></HEAD>
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1998-04-10 06:59:06 -04:00
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<BR>
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1996-09-27 06:29:02 -04:00
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<BODY bgcolor = #c3c3ff>
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<H2><IMG ALIGN=BOTTOM SRC="./Img/ManPageBlue.gif"> place</H2>
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<I>Geometry manager for fixed or rubber-sheet placement</I><P><IMG ALIGN=TOP SRC="./Img/line-red.gif">
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<H3><A NAME="M2">SYNOPSIS</A></H3>
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(<B>place </B><I>window option value </I>?<I>option value ...</I>?)<BR>
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(<B>place 'configure </B><I>window option value </I>?<I>option value ...</I>?)<BR>
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(<B>place 'forget </B><I>window</I>)<BR>
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(<B>place 'info </B><I>window</I>)<BR>
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(<B>place 'slaves </B><I>window</I>)<BR>
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<H3><A NAME="M3">DESCRIPTION</A></H3>
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The placer is a geometry manager for Tk.
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It provides simple fixed placement of windows, where you specify
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the exact size and location of one window, called the <I>slave</I>,
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within another window, called the <I>master</I>.
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The placer also provides rubber-sheet placement, where you specify the
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size and location of the slave in terms of the dimensions of
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the master, so that the slave changes size and location
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in response to changes in the size of the master.
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Lastly, the placer allows you to mix these styles of placement so
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that, for example, the slave has a fixed width and height but is
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centered inside the master.
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<P>
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If the first argument to the <B>place</B> procedure is a window path
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name or <B>configure</B> then the procedure arranges for the placer
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to manage the geometry of a slave whose path name is <I>window</I>.
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The remaining arguments consist of one or more <I>option:value</I>
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pairs that specify the way in which <I>window</I>'s
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geometry is managed.
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If the placer is already managing <I>window</I>, then the
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<I>option:value</I> pairs modify the configuration for <I>window</I>.
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In this form the <B>place</B> procedure returns an empty string as result.
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The following <I>option:value</I> pairs are supported:
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<P>
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<DL>
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<DT><A NAME="M4"><B>:in </B><I>master</I></A><DD>
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<I>Master</I> specifes the path name of the window relative
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to which <I>window</I> is to be placed.
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<I>Master</I> must either be <I>window</I>'s parent or a descendant
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of <I>window</I>'s parent.
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In addition, <I>master</I> and <I>window</I> must both be descendants
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of the same top-level window.
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These restrictions are necessary to guarantee
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that <I>window</I> is visible whenever <I>master</I> is visible.
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If this option isn't specified then the master defaults to
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<I>window</I>'s parent.
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<P>
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<DT><A NAME="M5"><B>:x </B><I>location</I></A><DD>
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<I>Location</I> specifies the x-coordinate within the master window
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of the anchor point for <I>window</I>.
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The location is specified in screen units (i.e. any of the forms
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accepted by <B>Tk_GetPixels</B>) and need not lie within the bounds
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of the master window.
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<P>
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<DT><A NAME="M6"><B>:relx </B><I>location</I></A><DD>
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<I>Location</I> specifies the x-coordinate within the master window
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of the anchor point for <I>window</I>.
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In this case the location is specified in a relative fashion
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as a floating-point number: 0.0 corresponds to the left edge
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of the master and 1.0 corresponds to the right edge of the master.
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<I>Location</I> need not be in the range 0.0-1.0.
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If both <B>:x</B> and <B>:relx</B> are specified for a slave
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then their values are summed. For example, <B>:relx 0.5 :x -2</B>
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positions the left edge of the slave 2 pixels to the left of the
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center of its master.
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<P>
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<DT><A NAME="M7"><B>:y </B><I>location</I></A><DD>
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<I>Location</I> specifies the y-coordinate within the master window
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of the anchor point for <I>window</I>.
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The location is specified in screen units (i.e. any of the forms
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accepted by <B>Tk_GetPixels</B>) and need not lie within the bounds
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of the master window.
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<P>
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<DT><A NAME="M8"><B>:rely </B><I>location</I></A><DD>
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<I>Location</I> specifies the y-coordinate within the master window
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of the anchor point for <I>window</I>.
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In this case the value is specified in a relative fashion
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as a floating-point number: 0.0 corresponds to the top edge
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of the master and 1.0 corresponds to the bottom edge of the master.
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<I>Location</I> need not be in the range 0.0-1.0.
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If both <B>:y</B> and <B>:rely</B> are specified for a slave
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then their values are summed. For example, <B>:rely 0.5 :x 3</B>
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positions the top edge of the slave 3 pixels below the
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center of its master.
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<P>
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<DT><A NAME="M9"><B>:anchor </B><I>where</I></A><DD>
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<I>Where</I> specifies which point of <I>window</I> is to be positioned
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at the (x,y) location selected by the <B>:x</B>, <B>:y</B>,
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<B>:relx</B>, and <B>:rely</B> options.
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The anchor point is in terms of the outer area of <I>window</I>
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including its border, if any.
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Thus if <I>where</I> is <B>se</B> then the lower-right corner of
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<I>window</I>'s border will appear at the given (x,y) location
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in the master.
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The anchor position defaults to <B>nw</B>.
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<P>
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<DT><A NAME="M10"><B>:width </B><I>size</I></A><DD>
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<I>Size</I> specifies the width for <I>window</I> in screen units
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(i.e. any of the forms accepted by <B>Tk_GetPixels</B>).
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The width will be the outer width of <I>window</I> including its
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border, if any.
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If <I>size</I> is an empty string, or if no <B>:width</B>
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or <B>:relwidth</B> option is specified, then the width requested
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internally by the window will be used.
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<P>
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<DT><A NAME="M11"><B>:relwidth </B><I>size</I></A><DD>
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<I>Size</I> specifies the width for <I>window</I>.
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In this case the width is specified as a floating-point number
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relative to the width of the master: 0.5 means <I>window</I> will
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be half as wide as the master, 1.0 means <I>window</I> will have
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the same width as the master, and so on.
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If both <B>:width</B> and <B>:relwidth</B> are specified for a slave,
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their values are summed. For example, <B>:relwidth 1.0 :width 5</B>
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makes the slave 5 pixels wider than the master.
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<P>
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<DT><A NAME="M12"><B>:height </B><I>size</I></A><DD>
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<I>Size</I> specifies the height for <I>window</I> in screen units
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(i.e. any of the forms accepted by <B>Tk_GetPixels</B>).
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The height will be the outer dimension of <I>window</I> including its
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border, if any.
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If <I>size</I> is an empty string, or if no <B>:height</B> or
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<B>:relheight</B> option is specified, then the height requested
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internally by the window will be used.
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<P>
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<DT><A NAME="M13"><B>:relheight </B><I>size</I></A><DD>
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<I>Size</I> specifies the height for <I>window</I>.
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In this case the height is specified as a floating-point number
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relative to the height of the master: 0.5 means <I>window</I> will
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be half as high as the master, 1.0 means <I>window</I> will have
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the same height as the master, and so on.
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If both <B>:height</B> and <B>:relheight</B> are specified for a slave,
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their values are summed. For example, <B>:relheight 1.0 :height :2</B>
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makes the slave 2 pixels shorter than the master.
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<P>
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<DT><A NAME="M14"><B>:bordermode </B><I>mode</I></A><DD>
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<I>Mode</I> determines the degree to which borders within the
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master are used in determining the placement of the slave.
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The default and most common value is <B>inside</B>.
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In this case the placer considers the area of the master to
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be the innermost area of the master, inside any border:
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an option of <B>:x 0</B> corresponds to an x-coordinate just
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inside the border and an option of <B>:relwidth 1.0</B>
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means <I>window</I> will fill the area inside the master's
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border.
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If <I>mode</I> is <B>outside</B> then the placer considers
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the area of the master to include its border;
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this mode is typically used when placing <I>window</I>
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outside its master, as with the options <B>:x 0 :y 0 :anchor 'ne</B>.
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Lastly, <I>mode</I> may be specified as <B>ignore</B>, in which
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case borders are ignored: the area of the master is considered
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to be its official X area, which includes any internal border but
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no external border. A bordermode of <B>ignore</B> is probably
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not very useful.
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<P>
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</DL>
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<P>
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If the same value is specified separately with
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two different options, such as <B>:x</B> and <B>:relx</B>, then
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the most recent option is used and the older one is ignored.
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<P>
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The <B>place slaves</B> procedure returns a list of all the slave
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windows for which <I>window</I> is the master.
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If there are no slaves for <I>window</I> then an empty string is
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returned.
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<P>
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The <B>place forget</B> procedure causes the placer to stop managing
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the geometry of <I>window</I>. As a side effect of this procedure
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<I>window</I> will be unmapped so that it doesn't appear on the
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screen.
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If <I>window</I> isn't currently managed by the placer then the
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procedure has no effect.
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<B>Place forget</B> returns an empty string as result.
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<P>
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The <B>place info</B> procedure returns a list giving the current
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configuration of <I>window</I>.
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The list consists of <I>option-value</I> pairs in exactly the
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same form as might be specified to the <B>place configure</B>
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procedure.
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If the configuration of a window has been retrieved with
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<B>place info</B>, that configuration can be restored later by
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first using <B>place forget</B> to erase any existing information
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for the window and then invoking <B>place configure</B> with
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the saved information.
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<H3><A NAME="M15">FINE POINTS</A></H3>
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It is not necessary for the master window to be the parent
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of the slave window.
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This feature is useful in at least two situations.
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First, for complex window layouts it means you can create a
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hierarchy of subwindows whose only purpose
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is to assist in the layout of the parent.
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The ``real children'' of the parent (i.e. the windows that
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are significant for the application's user interface) can be
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children of the parent yet be placed inside the windows
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of the geometry-management hierarchy.
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This means that the path names of the ``real children''
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don't reflect the geometry-management hierarchy and users
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can specify options for the real children
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without being aware of the structure of the geometry-management
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hierarchy.
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<P>
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A second reason for having a master different than the slave's
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parent is to tie two siblings together.
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For example, the placer can be used to force a window always to
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be positioned centered just below one of its
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siblings by specifying the configuration
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<PRE><B>:in </B><I>sibling</I><B> :relx 0.5 :rely 1.0 :anchor 'n :bordermode 'outside</B></PRE>
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Whenever the sibling is repositioned in the future, the slave
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will be repositioned as well.
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<P>
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Unlike many other geometry managers (such as the packer)
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the placer does not make any attempt to manipulate the geometry of
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the master windows or the parents of slave windows (i.e. it doesn't
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set their requested sizes).
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To control the sizes of these windows, make them windows like
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frames and canvases that provide configuration options for this purpose.
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<H3><A NAME="M16">SEE ALSO</A></H3>
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<B><A HREF="./grid.n.html">grid</A></B>, <B><A HREF="./pack.n.html">pack</A></B>
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1998-04-10 06:59:06 -04:00
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<P><IMG ALIGN=TOP SRC="./Img/line-red.gif"><P>
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1996-09-27 06:29:02 -04:00
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<A HREF=./STk-hlp.html><IMG ALIGN=BOTTOM SRC="./Img/RefBookBlue.gif"> Back to the <B>STk</B> main page</A>
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</BODY></HTML>
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