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diff --git a/tkhtml1/doc/spec.html b/tkhtml1/doc/spec.html new file mode 100644 index 0000000..cc88b52 --- /dev/null +++ b/tkhtml1/doc/spec.html @@ -0,0 +1,677 @@ +<html> +<!-- + Specifications for the Tk HTML Widget + $Revision$ + Copyright (C) 1997, 1998, 1999 D. Richard Hipp + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + + Author Contact Information: + drh@acm.org + http://www.hwaci.com/drh/ + + @(#) $Id$ +--> +<head> +<title>Interface Specification For The HTML Widget</title> +</head> +<body bgcolor=white> +<h1>Interface Specification For The HTML Widget</h1> + +<p>This is a draft interface specification for the Tk HTML +widget currently under development. +Since it is still a draft, it is subject to change. +Eventually, the interface will stabilize and this interface +specification will morph into a manual page.</p> + +<h2>Configuration Options</h2> + +<table cellspacing=10> +<tr><td valign=top><tt>-appletcommand</tt></td> +<td> + <p>This option specifies the name of the Tcl procedure to invoke when the + <tt><applet>...</applet></tt> tag sequence is seen. The html + widget will append two arguments to the procedure before calling it. + The first argument is the name of a widget that the callback should + create to hold the applet. + The second argument is + a list of name/value pairs which are the arguments to + the <tt><applet></tt> tag.</p> + + <p>The text between <tt><applet></tt> and <tt></applet></tt> + is normally suppressed. + However, if the <tt>-appletcommand</tt> option is set to the empty string, + the <tt><applet></tt> tag is ignored and all text between + <tt><applet></tt> and <tt></applet></tt> is displayed + normally.</p> + + <p>"<embed>" is treated as an alias for + "<applet></applet>".</p> +</td></tr> + +<tr><td valign=top><tt>-background</tt></td> +<td> + <p>The background color for the widget.</p> + + <p>Note that the <tt><body bgcolor=...></tt> HTML tag does not + automatically cause the widget to change its background color. If + you want the background color to change in response to this HTML tag, + then your Tcl script should intercept + the <tt><body></tt> tag using the + ``<tt>token handler</tt>'' widget command (described below) and + change the background color manually.</p> +</td></tr> + +<tr><td valign=top><tt>-base</tt></td> +<td> + <p>The base URI for the current document. This should be set to + the URI that was used to retrieve the document before parsing + begins.</p> +</td></tr> + +<tr><td valign=top><tt>-bd</tt><td>An alias for <tt>-borderwidth</tt> + +<tr><td valign=top><tt>-bg</tt><td>An alias for <tt>-background</tt> + +<tr><td valign=top><tt>-borderwidth</tt></td> +<td> + <p>The width of the 3-D border drawn around the parameter of the widget, in + pixels.</p> +</td></tr> + +<tr><td valign=top><tt>-cursor</tt></td> +<td> + <p>The cursor displayed when the pointer is positioned over the HTML widget. + If {}, the cursor reverts to its default shape.</p> +</td></tr> + +<tr><td valign=top><tt>-exportselection</tt></td> +</tr> + +<tr><td valign=top><tt>-fontcommand</tt></td> +<td> + <p>The name of a TCL procedure that is used to convert HTML font names + into TCL font names. A default built-in procedure is used if the value + of this option is {}.</p> + + <p>When the HTML widget needs a new font, it calls this procedure with + two arguments. This first argument is the font size expressed as an + integer between 1 and 7. The standard size is 4. The second argument + is a set of between 0 and 3 keywords drawn from the following set: + "bold", "italic", and "fixed". If the "bold" keyword is present in + the second argument, the font returned should be bold. If the "italic" + keyword is present, the font should be italic. If the "fixed" keyword + is present, the font should be fixed-width. The TCL procedure should + return the name of the TCL font that the HTML widget will use to render + the given HTML font. If the TCL procedure returns an empty string, + then the built-in default procedure is used to determine the font.</p> + + <p>Examples: This is {4 {}}. <tt>This is {4 fixed}</tt>. + <small>This is {3 {}}</small>. <large><tt><bold>This is {5 {fixed bold}} + </bold></tt></large></p> +</td></tr> + + +<tr><td valign=top><tt>-fg</tt></td> +<td>An alias for <tt>-foreground</tt>.</td> +</tr> + +<tr><td valign=top><tt>-foreground</tt></td> +<td> + The default foreground color in which HTML text is rendered. + The HTML can override this using the <tt>color=...</tt> attribute + on various HTML tags. +</td></tr> + +<tr><td valign=top> +<code>-formcommand <var>string</var></code> +</td><td> +Declares a handler for everything to do with forms within a document. +Arguments will be appended to <var>string</var> and the result evaluated +during parsing (for form creation) and when the widget is cleared (for +form cleanup). The first argument is a token for +identifying a form. The second argument selects the action to perform. +The remaining arguments depend on the action, as follows. + +<dl><dt><code><var>string token</var> form <var>URL method attrs</var></code> +<dd>The handler should begin taking notes for form <var>token</var>, +especially the (resolved) <var>URL</var> of the action and the +<var>method</var> to be applied. The raw attributes of the FORM element +are in the pairlist <var>attrs</var>. + +<dt><code><var>string token</var> flush</code> +<dd>When the document is cleared, the widget will destroy all the windows +it requested. This handler should clean up anything else +it created for that form. + +<dt><code><var>string token</var> input <var>path attrs</var></code> +<dd>The handler should create a window named <var>path</var> +appropriate for the element described by the <var>attrs</var>. +The widget will map the window into its rendering appropriately. +<p>It is not an error for the handler to return without creating such a window +(it's natural in the case of type=hidden); the widget simply +ignores the element in that case. +The attributes are the raw values in the HTML, with one exception; +a <code>src</code> will be resolved before the handler is called. + +<dt><code><var>string token</var> textarea <var>path attrs initial</var></code> +<dd>The handler should create a window (a single Text, or a Frame with Text +and Scrollbars, or whatever) appropriate for a <textarea> and +initialise it to the <var>initial</var> string. + +<dt><code><var>string token</var> select <var>path attrs choices initial</var></code> +<dd><em><select> is quite a complicated case...</em> +The handler should create a window +appropriate for a <select> of the given attributes and +present the list of <var>choices</var>. Each choice is a pair, the +value and its label. <var>initial</var> is a list of values initially +selected. <em>This approach is somewhat questionable but should do +most of the time.</em> +</dl> + +Caution: Be very careful to avoid confusing HTML variables with TCL +variables. It may be tempting to use the <code>name</code> attribute +fairly directly to link +together related widgets, but it will likely cause incorrect +behaviours. Also be careful to observe the order in which the elements are +created; this determines the order in which they must be submitted. +A default form handler with the correct bahaviour written in TCL will be +bundled with the widget. +<p>The attribute names will be downcased within <var>attrs</var>. +</td></tr> + +<tr><td valign=top><tt>-framecommand</tt><td> +The script specified by this option is invoked when the HTML parser +encounters a <tt><frameset>...</frameset></tt> tag sequence. +The arguments to the script are TBD. +If the value of the option is the empty string, then the text within +the <tt><noframe>...</noframe></tt> tag sequence is displayed. + +<tr><td valign=top><tt>-height</tt><td> +Specifies the height of the area into which HTML is rendered. +This value plus twice the <tt>-padx</tt>, <tt>-borderwidth</tt> and +<tt>-highlightthickness</tt> values is the total height of the widget. + +<tr><td valign=top><tt>-highlightbackground</tt><td> + +<tr><td valign=top><tt>-highlightcolor</tt><td> + +<tr><td valign=top><tt>-highlightthickness</tt><td> + +<tr><td valign=top><tt>-hyperlinkcommand</tt></td> +<td> + The script specified by this option is invoked whenever the user + clicks on a hyperlink on the HTML page. Before invoking this + script, the URI for the hyperlink is appended. +</td></tr> + +<tr><td valign=top><tt>-imagecommand</tt></td> +<td> + When a ``<tt><img src=...></tt>'' tag is encountered, the + HTML widget invokes the script specified by this option in order to + get the name of a Tk image object to display the HTML image. + Before invoking the script, the following arguments are appended: + <ol> + <li>The value of the <tt>src=...</tt> parameter after have been + processed by the resolver. + <li>The value of the <tt>width=...</tt> parameter. + <li>The value of the <tt>height=...</tt> parameter. + <li>A list containing the names and values of all parameters. + </ol> + If the name returned by this script is the empty string, or if the + script is an empty string, then the HTML widget displays the + <tt>alt=...</tt> text of the <tt><img></tt> tag instead of + an image. +</td></tr> + +<tr><td valign=top><tt>-isvisitedcommand</tt><td> +When the HTML widget encounters a hyperlink +(``<tt><a href=...></tt>'') it invokes the script specified +by this option in order to determine whether or not the hyperlink +has been visited. +This information is needed to determine what color to use to display +the hyperlink. + +<tr><td valign=top><tt>-padx</tt><td> +The amount of extra space to insert between the 3-D border and the +left and right sides of the document text. + +<tr><td valign=top><tt>-pady</tt><td> +The amount of extra space to insert between the 3-D border and the top +and bottom of the document text. + +<tr><td valign=top><tt>-relief</tt><td> +The relief used to draw the 3-D border. + +<tr><td valign=top><tt>-resolvercommand</tt></td> +<td> + <p>The name of a TCL command used to resolve URIs. If blank, a built-in + resolver is used. If a TCL command is specified but it returns + an empty string, the built-in resolver is used then too. + The build-in resolver is based on the algorithm + in section 5.2 of RFC 2396. </p> + + <p>Multiple URIs are appended to the TCL command before it is executed. + The first URI is the BASE URI of the document (the URL that specified + by the -base configuration option and updated according to any prior + <BASE> markup). Zero or more additional URIs are + appended to this base. The result of the script should be the resolution + of the whole series or URIs.</p> +</td></tr> + +<tr><td valign=top><tt>-rulerelief</tt></td> +<td> + <p>Determines the appearance of the Horizontal Rule (<HR>) markup. + The default is "sunken". This can also be "raised" or "flat". If + "flat", then the <HR> is drawn using a solid line in the current + foreground color. "groove" and "ridge" are the same as "flat".</p> +</td></tr> + +<tr><td valign=top><tt>-scriptcommand</tt></td> +<td> + <p>Whenever <SCRIPT>...</SCRIPT> markup is encountered in + the input HTML, the attributes of the <SCRIPT> markup and + the body of the script are appended to this string and the result + is executed as a TCL command. If this options is the empty string, + then the script is ignored. +</td></tr> + +<tr><td valign=top><tt>-selectioncolor</tt><td> +The background color used when drawing the selection. The +foreground color for the selection is the same as the regular +foreground color. + +<tr><td valign=top><tt>-tablerelief</tt></td> +<td> + <p>Determines the appearance of the borders around tables. + The default is "raised". This can also be "sunken" or "flat". If + "flat", then the borders is drawn using solid lines in the current + foreground color. "groove" and "ridge" are the same as "flat".</p> +</td></tr> + +<tr><td valign=top><tt>-takefocus</tt><td> + +<tr><td valign=top><tt>-unvisitedcolor</tt><td> +The foreground color used to draw hyperlinks that have not been visited. + +<tr><td valign=top><tt>-underlinehyperlinks</tt><td> +Set to TRUE to cause hyperlinks to be drawn using an underlined font. + +<tr><td valign=top><tt>-visitedcolor</tt><td> +The foreground color used to draw hyperlinks that have been visited. + +<tr><td valign=top><tt>-width</tt><td> +The width of the document text. +This value does not include space allocated for +<tt>-highlightthickness</tt>, <tt>-borderwiddth</tt> or +<tt>-padx</tt>. + +<tr><td valign=top><tt>-xscrollcommand</tt><td> + +<tr><td valign=top><tt>-yscrollcommand</tt><td> + +</table> + +<h2>Indices</h2> + +Internally, the HTML widget stores the HTML document as a list of +tokens. +Each token is either +<ul> +<li>a contiguous sequence of non-space characters (Text), +<li>a contiguous sequence of spaces, tabs or newlines (Space), +<li>or an HTML markup tag (such as ``<tt><em></tt>''.) +</ul> +Tokens are identified by number. +The first token is ``1'', the second is ``2'' and so forth. +So in its simplest form, an index is just an integer greater than 0. +<p> +Within a single Text or Space token, individual characters are +also identified by number, though the counting starts with 0 instead +of 1. +The character number is connected to the token number by a period. +So, for example, the 4th character in the 9th token would be +``9.3''. +<p> +Two integers separated by a dot is called the <em>connonical</em> form +of an index. +Other index forms are available, including: + +<table cellspacing=10> +<tr><td valign=top>end<td> +The keyword ``end'' means one character past +the last character of the last token. +<tr><td valign=top>@X,Y<td> +The character located at screen coordinates X,Y. +<tr><td valign=top>*.last<td> +The second integer can be replaced by the keyword ``last'' to mean the +last character in the token. +<tr><td valign=top>sel.first<td> +This is the first character that is part of the selection. +<tr><td valign=top>sel.last<td> +This is the last character that is part of the selection. +<tr><td valign=top>ins<td> +The character immediately following the insertion cursor. +</table> + +<h2>Commands</h2> + +<dl> +<dt><b>html</b> <i>window</i> ?<i>options ...</i>?</dt><p> +<dd> + Create a new HTML widget instance named <i>windows</i> +</dd> +<p> +<dt><b>html</b> <b>reformat</b> <i>from to text</i><p> +<dd> +Convert text from one encoding to another. The text is given +in the <i>text</i> argument. The current encoding of the text +is specified by the <i>from</i> argument. This command returns +the same text in the <i>to</i> encoding. +<p> +<i>From</i> and <i>to</i> may be any of the following values: +<p> +<table cellspacing=10> +<tr><td valign=top>plain</td> +<td> + Ordinary text with no characters escaped. +</td></tr> +<tr><td valign=top>http</td> +<td> + The text is encoded in a form suitable for use with the HTTP + protocol. Spaces are converted to "+". Special characters + and escaped as "%aa" where "a" is a hexadecimal digit. A special + character is anything other than an alphanumeric or one of these: + ".", "$", "-", or "_". +</td></tr> +<tr><td valign=top>url</td> +<td> + The text is encoded in a form suitable for use as a URI. + Spaces are converted to "+". Special characters + and escaped as "%aa" where "a" is a hexadecimal digit. A special + character is anything other than an alphanumeric or one of these: + ".", "$", "-", "_", or "/". +</td></tr> +<tr><td valign=top>html</td> +<td> + The text is encoded in a form suitable for use within HTML. + "&" is encoded as "&amp;", "<" is encoded as "&lt;" and so + forth. +</td></tr> +</table> +<p> +This command is intended to be useful to the TCL procedures that implement +callbacks for the HTML widget. +</dd> +<p> +<dt><b>html</b> <b>uri join</b> <i>scheme authority path query fragment</i><p> +<dd> +This command takes the five main components of a URI and joins them together +into a complete URI. Special characters in any component are escaped. +</dd> +<p> +<dt><b>html</b> <b>uri split</b> <i>uri</i><p> +<dd> +This command takes a single URI and splits it into its five major +components: scheme, authorithy, path, query and fragement. The command +returns a list where each component is an element of the list. +Components missing from the URI are represented as empty elements in +the list. +</dd> + +</dl> + +<h2>Widget Commands</h2> + +<dl> + +<dt><i>WIDGET</i>  <tt>cget</tt> <i>config-option</i><p> +<dd> +Return the value of a configuration option. Works just like any +other Tk widget. +<p> + +<dt><i>WIDGET</i>  <tt>clear</tt><p> +<dd> +Remove all tokens and text from the HTML widget. +The parser is reset to its initial state. +This routine should be called to changes pages. +<p> + +<dt><i>WIDGET</i>  <tt>configure</tt> ?<i>args...</i>?<p> +<dd> +The standard Tk configuration command. +<p> + +<dt><i>WIDGET</i>  <tt>href</tt>  <i>X  Y</i><p> +<dd>If the coordinates <i>X Y</i> define a point above a hyperlink, +then this command will return the target URL for that hyperlink. +The URL will be resolved using the -resolvercommand before it +is returned. +<p> + +<dt><i>WIDGET</i>  <tt>index</tt>  <i>INDEX  ?COUNT  UNITS?</i></p> +<dd> +Translates <i>INDEX</i> into its connonical form. +The connonical form of an index is two integers separated by a period. +<p> +The optional 3rd and 4th arguments specify a displacement from <i>INDEX</i> +to the value of the index returned. +<i>COUNT</i> can be any integer value, including a negative number. +<i>UNITS</i> must be either ``<tt>char</tt>'' or ``<tt>line</tt>''. +<p> + +<dt><i>WIDGET</i>  <tt>insert</tt>  <i>INDEX</i><p> +<dd> +Causes the insertion cursor (a flashing vertical bar) to be positioned +immediately before the character specified by <i>INDEX</i>. +<p> + +<dt><i>WIDGET</i>  <tt>names</tt><p> +<dd> +This command causes the widget to scan the entire text of the document +looking for tags of the form ``<tt><a name=...></tt>''. +It returns a list of values of the <tt>name=...</tt> fields. +<p> +The vertical position of the document can be moved to any of these names +using the ``<i>WIDGET</i> <tt>yview</tt> <i>NAME</i>'' command described +below. +<p> + +<dt><i>WIDGET</i>  <tt>parse</tt>  <i>HTML-TEXT</i><p> +<dd>Adds the given HTML text to the end of any text previously received +through the <tt>parse</tt> command and parses as much of the text as +possible into tokens. +Afterwards, the display is updated to show the new tokens, if they are +visible.<p> + +<dt><i>WIDGET</i> <tt>resolver</tt> ?<i>uri ...</i>?<p> +<dd>The resolver specified by the -resolvercommand option + is called with the + base URI of the document followed + by the remaining arguments to this commant. The result of this + command is the result of the -resolvercommand script.<p> + +<dt><i>WIDGET</i>  <tt>selection</tt>  <i>subcommand args...</i><p> +<dd>The selection widget command is used to control the selection.<p> + <dl> + <dt><i>WIDGET</i>  <tt>selection clear</tt><p> + <dd>Clear the current selection. No text will be selected after this + command executes.<p> + + <dt><i>WIDGET</i>  <tt>selection set</tt>  <i>START  END</i><p> + <dd>Change the selection to be all text contained within the given + indices.<p> + </dl> + <p> + +<dt><i>WIDGET</i>  <tt>text</tt>  <i>subcommand args...</i><p> +<dd>There are several token commands. They all have the common +property that they directly manipulate the text that is displayed. +These commands (none of which are currently implemented) can be used +to build an WYSIWYG editor for HTML.<p> + <dl> + <dt><i>WIDGET</i> <tt>text ascii</tt>  <i>INDEX-1  INDEX-2</i><p> + <dd><p> + Returns plain ASCII text that represents all characters between + <i>INDEX-1</i> and <i>INDEX-2</i>. Formatting tags are omitted. + The <i>INDEX-1</i> character is included by <i>INDEX-2</i> is omitted. + <p> + + <dt><i>WIDGET</i> <tt>text delete</tt>  <i>INDEX-1  INDEX-2</i><p> + <dd><p> + All text from <i>INDEX-1</i> up to, but not including <i>INDEX-2</i> is + removed and the display is updated accordingly. + <p> + + <dt><i>WIDGET</i> <tt>text html</tt>  <i>INDEX-1  INDEX-2</i><p> + <dd><p> + Returns HTML text that represents all characters and formatting tags + between <i>INDEX-1</i> and <i>INDEX-2</i>. + The <i>INDEX-1</i> character is included by <i>INDEX-2</i> is omitted. + <p> + + <dt><i>WIDGET</i> <tt>text insert</tt>  <i>INDEX  TEXT</i><p> + <dd><p> + Inserts one or more characters immediately before the character whose + index is given. + <p> + </dl> + + +<dt><i>WIDGET</i>  <tt>token</tt>  <i>subcommand args...</i><p> +<dd>There are several token commands. They all have the common + property that they involve the list of tokens into which the + HTML is parsed.<p> + Some of the following subcommands make use of indices. The + character number of these indices is ignored since these commands + deal only with whole tokens. + <p> + <dl> + <dt><i>WIDGET</i> <tt>token append</tt> + <i>TAG ARGUMENTS</i><p> + <dd> + The command causes a token to be appended to the current list of + tokens in the HTML widget. This command is typically used within + a token handler. + <p> + + + <dt><i>WIDGET</i> <tt>token delete</tt> + <i>INDEX  ?INDEX-2?</i><p> + <dd> + Deletes the single token indentified by the index. If a second index is + given, the range of tokens from the first to the second index inclusive + is deleted. + <p> + + <dt><i>WIDGET</i> <tt>token find</tt> + <i>TAG</i><p> + <dd> + Locates all tokens with the given <i>TAG</i> and returns them all + as a list. + Each element of the returned list is a sublist containing the index + for the token and the arguments for the token. + <p> + + <dt><i>WIDGET</i> <tt>token get</tt> + <i>INDEX  ?INDEX-2?</i><p> + <dd> + Returns a list of tokens in the range of <i>INDEX</i> through + <i>INDEX-2</i>. + Each element of the list consists of the token tag followed by + the token arguments. + <p> + + <dt><i>WIDGET</i> <tt>token handler</tt> + <i>TAG ?SCRIPT?</i><p> + <dd> + This command allows special processing to occur for selected tokens + in the HTML input stream. + The <i>TAG</i> argument is either ``Text'' or ``Space'' or the name + of an HTML tag (ex: ``H3'' or ``/A''). + If a non-empty script is specified for a particular tag, then when + instances of that tag are encountered by the parser, the parser calls the + corresponding script instead of appending the token to the end of the + token list. Before calling the script, three arguments are appended: + <ol> + <li>The token number. + <li>The tag. (ex: <tt>H3</tt>) + <li>A list of name/value pairs describing all arguments to the tag. + </ol> + An empty handler script causes the default processing to occur for + the tag. If the script argument is omitted all together, then + the current value of the token handler for the given tag is returned. + <p> + Only one handler may be defined for each token type. If a new + handler is specified for a token type that previously had a different + handler defined, then the old handler is overwritten by the new. + <p> + + <dt><i>WIDGET</i> <tt>token insert</tt> + <i>INDEX  TAG  ARGUMENTS</i><p> + <dd> + Inserts a single token given by <i>TAG</i> and <i>ARGUMENTS</i> into + the token list immediately before <i>INDEX</i>. + <p> + </dl> + +<p> + +<dt><i>WIDGET</i> <tt>xview</tt> <i>args...</i><p> +<dd>Used to control horizontal scrolling.<p> + <dl> + <dt><i>WIDGET</i>  <tt>xview</tt><p> + <dd>Returns a list containing two elements. The elements are a fractions + between 0.0 and 1.0 that define the position of the left and right + edges of + the visible part of the document as a fraction of the whole.<p> + <dt><i>WIDGET</i>  <tt>xview moveto</tt>  <i>FRACTION</i><p> + <dd>Adjusts the horizontal position of the document so that + <i>FRACTION</i> of the horizontal span of the document is off-screen + to the left.<p> + <dt><i>WIDGET</i>  <tt>xview scroll</i>  <i>NUMBER  WHAT</i><p> + <dd> + Shifts the view in the window left or right according to + <i>NUMBER</i> and <i>WHAT</i>.   <i>NUMBER</i> is an integer + and <i>WHAT</i> is either <tt>units</tt> or <tt>pages</tt>.<p> + </dl> + +<dt><i>WIDGET</i>  <tt>yview</tt> <i>args...</i><p> +<dd>Used to control the vertical position of the document.<p> + <dl> + <dt><i>WIDGET</i>  <tt>yview</tt><p> + <dd>Returns a list containing two elements. The elements are a fractions + between 0.0 and 1.0 that define the position of the top and bottom + edges of + the visible part of the document as a fraction of the whole.<p> + <dt><i>WIDGET</i>  <tt>yview</tt>  <i>NAME</i><p> + <dd>Adjusts the vertical position of the document so that the tag + ``<tt><a name=</tt><i>NAME</i><tt>></tt>'' is on screen, + and preferably near the top of the screen.<p> + <dt><i>WIDGET</i>  <tt>yview moveto</tt>  <i>FRACTION</i><p> + <dd>Adjusts the horizontal position of the document so that + <i>FRACTION</i> of the vertical span of the document is off-screen + above the visible region.<p> + <dt><i>WIDGET</i>  <tt>xview scroll</i> <i>NUMBER WHAT</i><p> + <dd> + Shifts the view in the window up or down according to + <i>NUMBER</i> and <i>WHAT</i>.   <i>NUMBER</i> is an integer + and <i>WHAT</i> is either <tt>units</tt> or <tt>pages</tt>.<p> + </dl> + +</dl> +</body> +</html> |