35 lines
1.8 KiB
HTML
35 lines
1.8 KiB
HTML
<HTML><HEAD><TITLE>Tk Built-In Commands - tkwait manual page</TITLE></HEAD>
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<BR>
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<BODY bgcolor = #c3c3ff>
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<H2><IMG ALIGN=BOTTOM SRC="./Img/ManPageBlue.gif"> tkwait</H2>
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<I>Wait for variable to change or window to be destroyed</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>tkwait 'variable </B><I>name</I>)<BR>
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(<B>tkwait 'visibility </B><I>name</I>)<BR>
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(<B>tkwait 'window </B><I>name</I>)<BR>
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<H3><A NAME="M3">DESCRIPTION</A></H3>
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The <B>tkwait</B> procedure waits for one of several things to happen,
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then it returns without taking any other actions.
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The return value is always an empty string.
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If the first argument is <B>variable</B> (or any abbreviation of
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it) then the second argument is the name of a global variable and the
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procedure waits for that variable to be modified.
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If the first argument is <B>visibility</B> (or any abbreviation
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of it) then the second argument is the name of a window and the
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<B>tkwait</B> procedure waits for a change in its
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visibility state (as indicated by the arrival of a VisibilityNotify
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event). This form is typically used to wait for a newly-created
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window to appear on the screen before taking some action.
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If the first argument is <B>window</B> (or any abbreviation
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of it) then the second argument is the name of a window and the
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<B>tkwait</B> procedure waits for that window to be destroyed.
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This form is typically used to wait for a user to finish interacting
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with a dialog box before using the result of that interaction.
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<P>
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While the <B>tkwait</B> procedure is waiting it processes events in
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the normal fashion, so the application will continue to respond
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to user interactions.
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<P><IMG ALIGN=TOP SRC="./Img/line-red.gif"><P>
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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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