245 lines
13 KiB
HTML
245 lines
13 KiB
HTML
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<HTML><HEAD><TITLE>Tk Built-In Commands - button manual page</TITLE></HEAD><BODY>
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<DL>
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<DD><A HREF="button.htm#M2" NAME="L114">NAME</A>
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<DL><DD>button - Create and manipulate button widgets</DL>
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<DD><A HREF="button.htm#M3" NAME="L115">SYNOPSIS</A>
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<DL>
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<DD><B>button</B> <I>pathName </I>?<I>options</I>?
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</DL>
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<DD><A HREF="button.htm#M4" NAME="L116">STANDARD OPTIONS</A>
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<DL>
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<DD><A HREF="options.htm#M-activebackground">-activebackground, activeBackground, Foreground</A>
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<DD><A HREF="options.htm#M-activeforeground">-activeforeground, activeForeground, Background</A>
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<DD><A HREF="options.htm#M-anchor">-anchor, anchor, Anchor</A>
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<DD><A HREF="options.htm#M-background">-background or -bg, background, Background</A>
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<DD><A HREF="options.htm#M-bitmap">-bitmap, bitmap, Bitmap</A>
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<DD><A HREF="options.htm#M-borderwidth">-borderwidth or -bd, borderWidth, BorderWidth</A>
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<DD><A HREF="options.htm#M-cursor">-cursor, cursor, Cursor</A>
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<DD><A HREF="options.htm#M-disabledforeground">-disabledforeground, disabledForeground, DisabledForeground</A>
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<DD><A HREF="options.htm#M-font">-font, font, Font</A>
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<DD><A HREF="options.htm#M-foreground">-foreground or -fg, foreground, Foreground</A>
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<DD><A HREF="options.htm#M-highlightbackground">-highlightbackground, highlightBackground, HighlightBackground</A>
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<DD><A HREF="options.htm#M-highlightcolor">-highlightcolor, highlightColor, HighlightColor</A>
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<DD><A HREF="options.htm#M-highlightthickness">-highlightthickness, highlightThickness, HighlightThickness</A>
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<DD><A HREF="options.htm#M-image">-image, image, Image</A>
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<DD><A HREF="options.htm#M-justify">-justify, justify, Justify</A>
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<DD><A HREF="options.htm#M-padx">-padx, padX, Pad</A>
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<DD><A HREF="options.htm#M-pady">-pady, padY, Pad</A>
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<DD><A HREF="options.htm#M-relief">-relief, relief, Relief</A>
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<DD><A HREF="options.htm#M-takefocus">-takefocus, takeFocus, TakeFocus</A>
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<DD><A HREF="options.htm#M-text">-text, text, Text</A>
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<DD><A HREF="options.htm#M-textvariable">-textvariable, textVariable, Variable</A>
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<DD><A HREF="options.htm#M-underline">-underline, underline, Underline</A>
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<DD><A HREF="options.htm#M-wraplength">-wraplength, wrapLength, WrapLength</A>
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</DL>
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<DD><A HREF="button.htm#M5" NAME="L117">WIDGET-SPECIFIC OPTIONS</A>
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<DL>
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<DD><A HREF="button.htm#M6" NAME="L118">-command, command, Command</A>
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<DD><A HREF="button.htm#M7" NAME="L119">-default, default, Default</A>
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<DD><A HREF="button.htm#M8" NAME="L120">-height, height, Height</A>
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<DD><A HREF="button.htm#M9" NAME="L121">-state, state, State</A>
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<DD><A HREF="button.htm#M10" NAME="L122">-width, width, Width</A>
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</DL>
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<DD><A HREF="button.htm#M11" NAME="L123">DESCRIPTION</A>
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<DD><A HREF="button.htm#M12" NAME="L124">WIDGET COMMAND</A>
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<DL>
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<DD><A HREF="button.htm#M13" NAME="L125"><I>pathName </I><B>cget</B> <I>option</I></A>
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<DD><A HREF="button.htm#M14" NAME="L126"><I>pathName </I><B>configure</B> ?<I>option</I>? ?<I>value option value ...</I>?</A>
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<DD><A HREF="button.htm#M15" NAME="L127"><I>pathName </I><B>flash</B></A>
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<DD><A HREF="button.htm#M16" NAME="L128"><I>pathName </I><B>invoke</B></A>
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</DL>
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<DD><A HREF="button.htm#M17" NAME="L129">DEFAULT BINDINGS</A>
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<DL>
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</DL>
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<DD><A HREF="button.htm#M18" NAME="L130">KEYWORDS</A>
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</DL><HR>
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<H3><A NAME="M2">NAME</A></H3>
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button - Create and manipulate button widgets
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<H3><A NAME="M3">SYNOPSIS</A></H3>
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<B>button</B> <I>pathName </I>?<I>options</I>?<BR>
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<H3><A NAME="M4">STANDARD OPTIONS</A></H3>
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<DL>
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<DT><B><A HREF="options.htm#M-activebackground">-activebackground, activeBackground, Foreground</A></B>
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<DT><B><A HREF="options.htm#M-activeforeground">-activeforeground, activeForeground, Background</A></B>
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<DT><B><A HREF="options.htm#M-anchor">-anchor, anchor, Anchor</A></B>
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<DT><B><A HREF="options.htm#M-background">-background or -bg, background, Background</A></B>
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<DT><B><A HREF="options.htm#M-bitmap">-bitmap, bitmap, Bitmap</A></B>
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<DT><B><A HREF="options.htm#M-borderwidth">-borderwidth or -bd, borderWidth, BorderWidth</A></B>
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<DT><B><A HREF="options.htm#M-cursor">-cursor, cursor, Cursor</A></B>
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<DT><B><A HREF="options.htm#M-disabledforeground">-disabledforeground, disabledForeground, DisabledForeground</A></B>
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<DT><B><A HREF="options.htm#M-font">-font, font, Font</A></B>
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<DT><B><A HREF="options.htm#M-foreground">-foreground or -fg, foreground, Foreground</A></B>
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<DT><B><A HREF="options.htm#M-highlightbackground">-highlightbackground, highlightBackground, HighlightBackground</A></B>
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<DT><B><A HREF="options.htm#M-highlightcolor">-highlightcolor, highlightColor, HighlightColor</A></B>
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<DT><B><A HREF="options.htm#M-highlightthickness">-highlightthickness, highlightThickness, HighlightThickness</A></B>
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<DT><B><A HREF="options.htm#M-image">-image, image, Image</A></B>
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<DT><B><A HREF="options.htm#M-justify">-justify, justify, Justify</A></B>
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<DT><B><A HREF="options.htm#M-padx">-padx, padX, Pad</A></B>
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<DT><B><A HREF="options.htm#M-pady">-pady, padY, Pad</A></B>
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<DT><B><A HREF="options.htm#M-relief">-relief, relief, Relief</A></B>
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<DT><B><A HREF="options.htm#M-takefocus">-takefocus, takeFocus, TakeFocus</A></B>
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<DT><B><A HREF="options.htm#M-text">-text, text, Text</A></B>
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<DT><B><A HREF="options.htm#M-textvariable">-textvariable, textVariable, Variable</A></B>
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<DT><B><A HREF="options.htm#M-underline">-underline, underline, Underline</A></B>
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<DT><B><A HREF="options.htm#M-wraplength">-wraplength, wrapLength, WrapLength</A></B>
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</DL>
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<H3><A NAME="M5">WIDGET-SPECIFIC OPTIONS</A></H3>
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<DL>
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<DT>Command-Line Name: <B><A NAME="M6">-command</A></B>
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<DT>Database Name: <B>command</B>
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<DT>Database Class: <B>Command</B>
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<DD>Specifies a Tcl command to associate with the button. This command
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is typically invoked when mouse button 1 is released over the button
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window.
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<P><DT>Command-Line Name: <B><A NAME="M7">-default</A></B>
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<DT>Database Name: <B>default</B>
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<DT>Database Class: <B>Default</B>
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<DD>Specifies one of three states for the default ring: <B>normal</B>,
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<B>active</B>, or <B>disabled</B>. In active state, the button is drawn
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with the platform specific appearance for a default button. In normal
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state, the button is drawn with the platform specific appearance for a
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non-default button, leaving enough space to draw the default button
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appearance. The normal and active states will result in buttons of
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the same size. In disabled state, the button is drawn with the
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non-default button appearance without leaving space for the default
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appearance. The disabled state may result in a smaller button than
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the active state.
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ring.
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<P><DT>Command-Line Name: <B><A NAME="M8">-height</A></B>
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<DT>Database Name: <B>height</B>
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<DT>Database Class: <B>Height</B>
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<DD>Specifies a desired height for the button.
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If an image or bitmap is being displayed in the button then the value is in
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screen units (i.e. any of the forms acceptable to <B><A HREF="../TclLib/GetPixels.htm">Tk_GetPixels</A></B>);
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for text it is in lines of text.
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If this option isn't specified, the button's desired height is computed
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from the size of the image or bitmap or text being displayed in it.
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<P><DT>Command-Line Name: <B><A NAME="M9">-state</A></B>
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<DT>Database Name: <B>state</B>
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<DT>Database Class: <B>State</B>
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<DD>Specifies one of three states for the button: <B>normal</B>, <B>active</B>,
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or <B>disabled</B>. In normal state the button is displayed using the
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<B>foreground</B> and <B>background</B> options. The active state is
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typically used when the pointer is over the button. In active state
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the button is displayed using the <B>activeForeground</B> and
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<B>activeBackground</B> options. Disabled state means that the button
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should be insensitive: the default bindings will refuse to activate
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the widget and will ignore mouse button presses.
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In this state the <B>disabledForeground</B> and
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<B>background</B> options determine how the button is displayed.
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<P><DT>Command-Line Name: <B><A NAME="M10">-width</A></B>
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<DT>Database Name: <B>width</B>
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<DT>Database Class: <B>Width</B>
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<DD>Specifies a desired width for the button.
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If an image or bitmap is being displayed in the button then the value is in
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screen units (i.e. any of the forms acceptable to <B><A HREF="../TclLib/GetPixels.htm">Tk_GetPixels</A></B>);
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for text it is in characters.
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If this option isn't specified, the button's desired width is computed
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from the size of the image or bitmap or text being displayed in it.
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</DL>
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<H3><A NAME="M11">DESCRIPTION</A></H3>
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The <B>button</B> command creates a new window (given by the
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<I>pathName</I> argument) and makes it into a button widget.
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Additional
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options, described above, may be specified on the command line
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or in the option database
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to configure aspects of the button such as its colors, font,
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text, and initial relief. The <B>button</B> command returns its
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<I>pathName</I> argument. At the time this command is invoked,
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there must not exist a window named <I>pathName</I>, but
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<I>pathName</I>'s parent must exist.
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<P>
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A button is a widget that displays a textual string, bitmap or image.
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If text is displayed, it must all be in a single font, but it
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can occupy multiple lines on the screen (if it contains newlines
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or if wrapping occurs because of the <B>wrapLength</B> option) and
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one of the characters may optionally be underlined using the
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<B>underline</B> option.
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It can display itself in either of three different ways, according
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to
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the <B>state</B> option;
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it can be made to appear raised, sunken, or flat;
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and it can be made to flash. When a user invokes the
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button (by pressing mouse button 1 with the cursor over the
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button), then the Tcl command specified in the <B>-command</B>
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option is invoked.
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<H3><A NAME="M12">WIDGET COMMAND</A></H3>
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The <B>button</B> command creates a new Tcl command whose
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name is <I>pathName</I>. This
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command may be used to invoke various
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operations on the widget. It has the following general form:
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<PRE><I>pathName option </I>?<I>arg arg ...</I>?</PRE>
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<I>Option</I> and the <I>arg</I>s
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determine the exact behavior of the command. The following
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commands are possible for button widgets:
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<P>
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<DL>
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<P><DT><A NAME="M13"><I>pathName </I><B>cget</B> <I>option</I></A><DD>
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Returns the current value of the configuration option given
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by <I>option</I>.
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<I>Option</I> may have any of the values accepted by the <B>button</B>
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command.
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<P><DT><A NAME="M14"><I>pathName </I><B>configure</B> ?<I>option</I>? ?<I>value option value ...</I>?</A><DD>
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Query or modify the configuration options of the widget.
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If no <I>option</I> is specified, returns a list describing all of
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the available options for <I>pathName</I> (see <B><A HREF="../TclLib/ConfigWidg.htm">Tk_ConfigureInfo</A></B> for
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information on the format of this list). If <I>option</I> is specified
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with no <I>value</I>, then the command returns a list describing the
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one named option (this list will be identical to the corresponding
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sublist of the value returned if no <I>option</I> is specified). If
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one or more <I>option-value</I> pairs are specified, then the command
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modifies the given widget option(s) to have the given value(s); in
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this case the command returns an empty string.
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<I>Option</I> may have any of the values accepted by the <B>button</B>
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command.
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<P><DT><A NAME="M15"><I>pathName </I><B>flash</B></A><DD>
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Flash the button. This is accomplished by redisplaying the button
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several times, alternating between active and normal colors. At
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the end of the flash the button is left in the same normal/active
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state as when the command was invoked.
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This command is ignored if the button's state is <B>disabled</B>.
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<P><DT><A NAME="M16"><I>pathName </I><B>invoke</B></A><DD>
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Invoke the Tcl command associated with the button, if there is one.
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The return value is the return value from the Tcl command, or an
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empty string if there is no command associated with the button.
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This command is ignored if the button's state is <B>disabled</B>.
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<P></DL>
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<H3><A NAME="M17">DEFAULT BINDINGS</A></H3>
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Tk automatically creates class bindings for buttons that give them
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default behavior:
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<P>
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<DL>
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<P><DT>[1]<DD>
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A button activates whenever the mouse passes over it and deactivates
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whenever the mouse leaves the button.
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Under Windows, this binding is only active when mouse button 1 has
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been pressed over the button.
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<P><DT>[2]<DD>
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A button's relief is changed to sunken whenever mouse button 1 is
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pressed over the button, and the relief is restored to its original
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value when button 1 is later released.
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<P><DT>[3]<DD>
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If mouse button 1 is pressed over a button and later released over
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the button, the button is invoked. However, if the mouse is not
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over the button when button 1 is released, then no invocation occurs.
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<P><DT>[4]<DD>
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When a button has the input focus, the space key causes the button
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to be invoked.
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<P></DL>
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<P>
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If the button's state is <B>disabled</B> then none of the above
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actions occur: the button is completely non-responsive.
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<P>
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The behavior of buttons can be changed by defining new bindings for
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individual widgets or by redefining the class bindings.
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<H3><A NAME="M18">KEYWORDS</A></H3>
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<A href="../Keywords/B.htm#button">button</A>, <A href="../Keywords/W.htm#widget">widget</A>
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<HR><PRE>
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<A HREF="../copyright.htm">Copyright</A> © 1990-1994 The Regents of the University of California.
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<A HREF="../copyright.htm">Copyright</A> © 1994-1996 Sun Microsystems, Inc.
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<A HREF="../copyright.htm">Copyright</A> © 1995-1997 Roger E. Critchlow Jr.</PRE>
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</BODY></HTML>
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