916 lines
24 KiB
XML
916 lines
24 KiB
XML
<sect1 id="TextSink_Object">
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<title>TextSink Object</title>
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<para>
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<!-- .LP -->
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<!-- .XS -->
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<!-- TextSink Object -->
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<!-- .XE -->
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<!-- .IN "TextSink object" "" "@DEF@" -->
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</para>
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<para>
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<!-- .LP -->
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<literallayout class="monospaced">
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<!-- .TA 2.0i -->
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<!-- .ta 2.0i -->
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Application Header file <X11/Xaw/TextSink.h>
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<!-- .IN "TextSink.h" "" -->
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Class Header file <X11/Xaw/TextSinkP.h>
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<!-- .IN "TextSinkP.h" "" -->
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Class textSinkObjectClass
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<!-- .IN "textSinkObjectClass" "" -->
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Class Name TextSink
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<!-- .IN "TextSink object" "class name" -->
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Superclass Object
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</literallayout>
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</para>
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<para>
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<!-- .LP -->
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The TextSink object is the root object for all text sinks. Any new text
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sink objects should be subclasses of the TextSink Object. The TextSink
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Class contains all methods that the Text widget expects a text sink to
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export.
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</para>
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<para>
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<!-- .LP -->
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Since all text sinks will have some resources in common, the TextSink
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defines a few new resources.
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</para>
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<sect2 id="textsink_resources">
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<title>Resources</title>
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<para>
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<!-- .LP -->
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When creating an TextSink object instance, the following resources are
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retrieved from the argument list or from the resource database:
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</para>
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<para>
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<!-- .LP -->
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<!-- .IN "AsciiSink object" "resources" -->
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<informaltable>
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<tgroup cols='5' align='center'>
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<colspec colname='c1'/>
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<colspec colname='c2'/>
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<colspec colname='c3'/>
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<colspec colname='c4'/>
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<colspec colname='c5'/>
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<thead>
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<row>
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<entry>Name</entry>
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<entry>Class</entry>
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<entry>Type</entry>
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<entry>Notes</entry>
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<entry>Default Value</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry>background</entry>
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<entry>Background</entry>
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<entry>Pixel</entry>
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<entry></entry>
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<entry>XtDefaultBackground</entry>
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</row>
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<row>
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<entry>destroyCallback</entry>
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<entry>Callback</entry>
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<entry>XtCallbackList</entry>
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<entry></entry>
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<entry>NULL</entry>
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</row>
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<row>
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<entry>foreground</entry>
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<entry>Foreground</entry>
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<entry>Pixel</entry>
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<entry></entry>
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<entry>XtDefaultForeground</entry>
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</row>
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<row>
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<entry>_</entry>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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<!-- .Bg Bold -->
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<!-- .Dc -->
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<!-- .Sg Bold -->
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</para>
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</sect2>
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<sect2 id="Subclassing_the_TextSink">
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<title>Subclassing the TextSink</title>
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<!-- .IN "TextSink object" "subclassing" "@DEF@" -->
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<para>
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<!-- .LP -->
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The only purpose of the TextSink Object is to be subclassed. It
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contains the minimum set of class methods that all text sinks must have.
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While all may be inherited, the direct descendant of TextSink <function>must
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specify</function> some of them as TextSink does contain enough information to
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be a valid text sink by itself. Do not try to use
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the TextSink as a valid sink for the Text widget; it is not intended
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to be used as a sink by itself.
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<informaltable>
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<tgroup cols='4' align='center'>
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<colspec colname='c1'/>
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<colspec colname='c2'/>
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<colspec colname='c3'/>
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<colspec colname='c4'/>
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<thead>
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<row>
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<entry>Function</entry>
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<entry>Inherit with</entry>
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<entry>Public Interface</entry>
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<entry>must specify</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry>DisplayText</entry>
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<entry>XtInheritDisplayText</entry>
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<entry>XawTextSinkDisplayText</entry>
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<entry>yes</entry>
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</row>
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<row>
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<entry>InsertCursor</entry>
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<entry>XtInheritInsertCursor</entry>
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<entry>XawTextSinkInsertCursor</entry>
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<entry>yes</entry>
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</row>
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<row>
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<entry>ClearToBackground</entry>
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<entry>XtInheritClearToBackground</entry>
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<entry>XawTextSinkClearToBackground</entry>
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<entry>no</entry>
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</row>
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<row>
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<entry>FindPosition</entry>
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<entry>XtInheritFindPosition</entry>
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<entry>XawTextSinkFindPosition</entry>
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<entry>yes</entry>
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</row>
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<row>
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<entry>FindDistance</entry>
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<entry>XtInheritFindDistance</entry>
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<entry>XawTextSinkFindDistance</entry>
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<entry>yes</entry>
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</row>
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<row>
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<entry>Resolve</entry>
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<entry>XtInheritResolve</entry>
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<entry>XawTextSinkResolve</entry>
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<entry>yes</entry>
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</row>
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<row>
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<entry>MaxLines</entry>
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<entry>XtInheritMaxLines</entry>
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<entry>XawTextSinkMaxLines</entry>
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<entry>no</entry>
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</row>
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<row>
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<entry>MaxHeight</entry>
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<entry>XtInheritMaxHeight</entry>
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<entry>XawTextSinkMaxHeight</entry>
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<entry>no</entry>
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</row>
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<row>
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<entry>SetTabs</entry>
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<entry>XtInheritSetTabs</entry>
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<entry>XawTextSinkSetTabs</entry>
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<entry>no</entry>
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</row>
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<row>
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<entry>GetCursorBounds</entry>
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<entry>XtInheritGetCursorBounds</entry>
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<entry>XawTextSinkGetCursorBounds</entry>
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<entry>yes</entry>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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</para>
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<sect3 id="Displaying_Text">
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<title>Displaying Text</title>
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<para>
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<!-- .LP -->
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To display a section of the text buffer contained in the text source
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use the function <function>DisplayText</function>:
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<!-- .IN "TextSink object" "DisplayText" "@DEF@" -->
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<funcsynopsis>
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<funcprototype>
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<funcdef>void<function> DisplayText</function></funcdef>
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<paramdef>Widget<parameter> w</parameter></paramdef>
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<paramdef>Positionx,<parameter> y</parameter></paramdef>
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<paramdef>XawTextPositionpos1,<parameter> pos2</parameter></paramdef>
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<paramdef>Boolean<parameter> highlight</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<!-- .FN -->
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<variablelist>
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<varlistentry>
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<term>
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<emphasis remap='I'>w</emphasis>
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</term>
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<listitem>
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<para>
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Specifies the TextSink object.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<emphasis remap='I'>x</emphasis>
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</term>
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<listitem>
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<para>
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Specifies the x location to start drawing the text.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<emphasis remap='I'>y</emphasis>
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</term>
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<listitem>
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<para>
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Specifies the y location to start drawing text.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<emphasis remap='I'>pos1</emphasis>
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</term>
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<listitem>
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<para>
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Specifies the location within the text source of the first character
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to be printed.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<emphasis remap='I'>pos2</emphasis>
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</term>
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<listitem>
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<para>
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Specifies the location within the text source of the last character
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to be printed.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<emphasis remap='I'>highlight</emphasis>
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</term>
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<listitem>
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<para>
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Specifies whether or not to paint the text region highlighted.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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<para>
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<!-- .LP -->
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The Text widget will only pass one line at a time to the text sink, so
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this function does not need to know how to line feed the text. It is
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acceptable for this function to just ignore Carriage Returns. <emphasis remap='I'>x</emphasis>
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and <emphasis remap='I'>y</emphasis> denote the upper left hand corner of the first character to
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be displayed.
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</para>
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</sect3>
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<sect3 id="Displaying_the_Insert_Point">
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<title>Displaying the Insert Point</title>
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<para>
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<!-- .LP -->
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The function that controls the display of the text cursor is
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<function>InsertCursor</function>. This function will be called whenever the text
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widget desires to change the state of, or move the insert point.
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<funcsynopsis>
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<funcprototype>
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<funcdef>void<function> InsertCursor</function></funcdef>
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<paramdef>Widget<parameter> w</parameter></paramdef>
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<paramdef>Positionx,<parameter> y</parameter></paramdef>
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<paramdef>XawTextInsertState<parameter> state</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<!-- .FN -->
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<variablelist>
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<varlistentry>
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<term>
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<emphasis remap='I'>w</emphasis>
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</term>
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<listitem>
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<para>
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Specifies the TextSink object.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<emphasis remap='I'>x</emphasis>
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</term>
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<listitem>
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<para>
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Specifies the x location of the cursor in Pixels.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<emphasis remap='I'>y</emphasis>
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</term>
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<listitem>
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<para>
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Specifies the y location of the cursor in Pixels.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<emphasis remap='I'>state</emphasis>
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</term>
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<listitem>
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<para>
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Specifies the state of the cursor, may be one of <function>XawisOn</function> or
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<function>XawisOff</function>.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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<para>
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<!-- .LP -->
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<emphasis remap='I'>X</emphasis> and <emphasis remap='I'>y</emphasis> denote the upper left hand corner of the insert point.
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</para>
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</sect3>
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<sect3 id="Clearing_Portions_of_the_Text_window">
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<title>Clearing Portions of the Text window</title>
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<para>
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<!-- .LP -->
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To clear a portion of the Text window to its background color, the Text
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widget will call <function>ClearToBackground</function>. The TextSink object already
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defines this function as calling <function>XClearArea</function> on the region passed.
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This behavior will be used if you specify
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<function>XtInheritClearToBackground</function> for this method.
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<!-- .IN "XtInheritClearToBackground" "" -->
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<!-- .IN "TextSink object" "ClearToBackground" "@DEF@" -->
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<funcsynopsis>
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<funcprototype>
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<funcdef>void<function> ClearToBackground</function></funcdef>
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<paramdef>Widget<parameter> w</parameter></paramdef>
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<paramdef>Positionx,<parameter> y</parameter></paramdef>
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<paramdef>Dimensionwidth,<parameter> height</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<!-- .FN -->
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<variablelist>
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<varlistentry>
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<term>
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<emphasis remap='I'>w</emphasis>
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</term>
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<listitem>
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<para>
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Specifies the TextSink object.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<emphasis remap='I'>x</emphasis>
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</term>
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<listitem>
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<para>
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Specifies the x location, in pixels, of the Region to clear.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<emphasis remap='I'>y</emphasis>
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</term>
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<listitem>
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<para>
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Specifies the y location, in pixels, of the Region to clear.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<emphasis remap='I'>width</emphasis>
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</term>
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<listitem>
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<para>
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Specifies the width, in pixels, of the Region to clear.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<emphasis remap='I'>height</emphasis>
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</term>
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<listitem>
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<para>
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Specifies the height, in pixels, of the Region to clear.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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<para>
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<!-- .LP -->
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<emphasis remap='I'>X</emphasis> and <emphasis remap='I'>y</emphasis> denote the upper left hand corner of region to clear.
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</para>
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</sect3>
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<sect3 id="Finding_a_Text_Position_Given_Pixel_Values">
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<title>Finding a Text Position Given Pixel Values</title>
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<para>
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<!-- .LP -->
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To find the text character position that will be rendered at a given x
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location the Text widget uses the function <function>FindPosition</function>:
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<!-- .IN "TextSink object" "FindPosition" "@DEF@" -->
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<funcsynopsis>
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<funcprototype>
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<funcdef>void<function> FindPosition</function></funcdef>
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<paramdef>Widget<parameter> w</parameter></paramdef>
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<paramdef>XawTextPosition<parameter> fromPos</parameter></paramdef>
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<paramdef>intfromX,<parameter> width</parameter></paramdef>
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<paramdef>Boolean<parameter> stopAtWordBreak</parameter></paramdef>
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<paramdef>XawTextPosition<parameter> *pos_return</parameter></paramdef>
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<paramdef>int*width_return,<parameter> *height_return</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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<!-- .FN -->
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<variablelist>
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<varlistentry>
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<term>
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<emphasis remap='I'>w</emphasis>
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</term>
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<listitem>
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<para>
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Specifies the TextSink object.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<emphasis remap='I'>fromPos</emphasis>
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</term>
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<listitem>
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<para>
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Specifies a reference position, usually the first character in this line.
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This character is always to the left of the desired character location.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<emphasis remap='I'>fromX</emphasis>
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</term>
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<listitem>
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<para>
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Specifies the distance that the left edge of <emphasis remap='I'>fromPos</emphasis> is from the
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left edge of the window. This is the reference x location for the
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reference position.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<emphasis remap='I'>width</emphasis>
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</term>
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<listitem>
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<para>
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Specifies the distance, in pixels, from the reference position to the
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desired character position.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<emphasis remap='I'>stopAtWordBreak</emphasis>
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</term>
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<listitem>
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<para>
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Specifies whether or not the position that is returned should be forced
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to be on a word boundary.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<emphasis remap='I'>pos_return</emphasis>
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</term>
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<listitem>
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<para>
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Returns the character position that corresponds to the location that has
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been specified, or the work break immediately to the left of the
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position if <emphasis remap='I'>stopAtWordBreak</emphasis> is <function>True</function>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<emphasis remap='I'>width_return</emphasis>
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</term>
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<listitem>
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<para>
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Returns the actual distance between <emphasis remap='I'>fromPos</emphasis> and <emphasis remap='I'>pos_return</emphasis>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<emphasis remap='I'>height_return</emphasis>
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</term>
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<listitem>
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<para>
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Returns the maximum height of the text between <emphasis remap='I'>fromPos</emphasis> and
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<emphasis remap='I'>pos_return</emphasis>.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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<para>
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<!-- .LP -->
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This function need make no attempt to deal with line feeds. The text
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widget will only call it one line at a time.
|
|
</para>
|
|
<para>
|
|
<!-- .LP -->
|
|
<!-- .sp -->
|
|
Another means of finding a text position is provided by the <function>Resolve</function>
|
|
function:
|
|
<!-- .IN "TextSink object" "Resolve" "@DEF@" -->
|
|
<funcsynopsis>
|
|
<funcprototype>
|
|
<funcdef>void<function> Resolve</function></funcdef>
|
|
<paramdef>Widget<parameter> w</parameter></paramdef>
|
|
<paramdef>XawTextPosition<parameter> fromPos</parameter></paramdef>
|
|
<paramdef>intfromX,<parameter> width</parameter></paramdef>
|
|
<paramdef>XawTextPosition<parameter> *pos_return</parameter></paramdef>
|
|
</funcprototype>
|
|
</funcsynopsis>
|
|
<!-- .FN -->
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term>
|
|
<emphasis remap='I'>w</emphasis>
|
|
</term>
|
|
<listitem>
|
|
<para>
|
|
Specifies the TextSink object.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term>
|
|
<emphasis remap='I'>fromPos</emphasis>
|
|
</term>
|
|
<listitem>
|
|
<para>
|
|
Specifies a reference position, usually the first character in this line.
|
|
This character is always to the left of the desired character location.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term>
|
|
<emphasis remap='I'>fromX</emphasis>
|
|
</term>
|
|
<listitem>
|
|
<para>
|
|
Specifies the distance that the left edge of <emphasis remap='I'>fromPos</emphasis> is from the
|
|
left edge of the window. This is the reference x location for the
|
|
reference position.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term>
|
|
<emphasis remap='I'>width</emphasis>
|
|
</term>
|
|
<listitem>
|
|
<para>
|
|
Specifies the distance, in pixels, from the reference position to the
|
|
desired character position.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term>
|
|
<emphasis remap='I'>pos_return</emphasis>
|
|
</term>
|
|
<listitem>
|
|
<para>
|
|
Returns the character position that corresponds to the
|
|
location that has been specified, or the word break immediately to the left
|
|
if <emphasis remap='I'>stopAtWordBreak</emphasis> is <function>True</function>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</para>
|
|
<para>
|
|
<!-- .LP -->
|
|
This function need make no attempt to deal with line feeds. The text
|
|
widget will only call it one line at a time. This is a more convenient
|
|
interface to the <function>FindPosition</function> function, and provides a subset of its
|
|
functionality.
|
|
<!-- .IN "FindPosition" "" -->
|
|
</para>
|
|
</sect3>
|
|
<sect3 id="Finding_the_Distance_Between_two_Text_Positions">
|
|
<title>Finding the Distance Between two Text Positions</title>
|
|
<para>
|
|
<!-- .LP -->
|
|
To find the distance in pixels between two text positions on the same
|
|
line use the function <function>FindDistance</function>.
|
|
<!-- .IN "TextSink object" "FindDistance" "@DEF@" -->
|
|
<funcsynopsis>
|
|
<funcprototype>
|
|
<funcdef>void<function> FindDistance</function></funcdef>
|
|
<paramdef>Widget<parameter> w</parameter></paramdef>
|
|
<paramdef>XawTextPositionfromPos,<parameter> toPos</parameter></paramdef>
|
|
<paramdef>int<parameter> fromX</parameter></paramdef>
|
|
<paramdef>XawTextPosition<parameter> *pos_return</parameter></paramdef>
|
|
<paramdef>int*width_return,<parameter> *height_return</parameter></paramdef>
|
|
</funcprototype>
|
|
</funcsynopsis>
|
|
<!-- .FN -->
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term>
|
|
<emphasis remap='I'>w</emphasis>
|
|
</term>
|
|
<listitem>
|
|
<para>
|
|
Specifies the TextSink object.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term>
|
|
<emphasis remap='I'>fromPos</emphasis>
|
|
</term>
|
|
<listitem>
|
|
<para>
|
|
Specifies the text buffer position, in characters, of the first position.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term>
|
|
<emphasis remap='I'>fromX</emphasis>
|
|
</term>
|
|
<listitem>
|
|
<para>
|
|
Specifies the distance that the left edge of <emphasis remap='I'>fromPos</emphasis> is from the
|
|
left edge of the window. This is the reference x location for the
|
|
reference position.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term>
|
|
<emphasis remap='I'>toPos</emphasis>
|
|
</term>
|
|
<listitem>
|
|
<para>
|
|
Specifies the text buffer position, in characters, of the second position.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term>
|
|
<emphasis remap='I'>resWidth</emphasis>
|
|
</term>
|
|
<listitem>
|
|
<para>
|
|
Return the actual distance between <emphasis remap='I'>fromPos</emphasis>
|
|
and <emphasis remap='I'>pos_return</emphasis>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term>
|
|
<emphasis remap='I'>resPos</emphasis>
|
|
</term>
|
|
<listitem>
|
|
<para>
|
|
Returns the character position that corresponds to the actual character
|
|
position used for <emphasis remap='I'>toPos</emphasis> in the calculations. This may be
|
|
different than <emphasis remap='I'>toPos</emphasis>, for example if <emphasis remap='I'>fromPos</emphasis> and <emphasis remap='I'>toPos</emphasis>
|
|
are on different lines in the file.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term>
|
|
<emphasis remap='I'>height_return</emphasis>
|
|
</term>
|
|
<listitem>
|
|
<para>
|
|
Returns the maximum height of the text between <emphasis remap='I'>fromPos</emphasis> and
|
|
<emphasis remap='I'>pos_return</emphasis>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</para>
|
|
<para>
|
|
<!-- .LP -->
|
|
This function need make no attempt to deal with line feeds. The Text
|
|
widget will only call it one line at a time.
|
|
</para>
|
|
</sect3>
|
|
<sect3 id="Finding_the_Size_of_the_Drawing_area">
|
|
<title>Finding the Size of the Drawing area</title>
|
|
<para>
|
|
<!-- .LP -->
|
|
To find the maximum number of lines that will fit into the current Text
|
|
widget, use the function <function>MaxLines</function>. The TextSink already defines
|
|
this function to compute the maximum number of lines by using the height
|
|
of <function>font</function>.
|
|
<!-- .IN "TextSink object" "MaxLines" "@DEF@" -->
|
|
<funcsynopsis>
|
|
<funcprototype>
|
|
<funcdef>int<function> MaxLines</function></funcdef>
|
|
<paramdef>Widget<parameter> w</parameter></paramdef>
|
|
<paramdef>Dimension<parameter> height</parameter></paramdef>
|
|
</funcprototype>
|
|
</funcsynopsis>
|
|
<!-- .FN -->
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term>
|
|
<emphasis remap='I'>w</emphasis>
|
|
</term>
|
|
<listitem>
|
|
<para>
|
|
Specifies the TextSink object.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term>
|
|
<emphasis remap='I'>height</emphasis>
|
|
</term>
|
|
<listitem>
|
|
<para>
|
|
Specifies the height of the current drawing area.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</para>
|
|
<para>
|
|
<!-- .LP -->
|
|
Returns the maximum number of lines that will fit in <emphasis remap='I'>height</emphasis>.
|
|
</para>
|
|
<para>
|
|
<!-- .LP -->
|
|
<!-- .sp -->
|
|
To find the height required for a given number of text lines, use
|
|
the function <function>MaxHeight</function>. The TextSink already defines this
|
|
function to compute the maximum height of the window by using the
|
|
height of <function>font</function>.
|
|
<!-- .IN "TextSink object" "MaxHeight" "@DEF@" -->
|
|
<funcsynopsis>
|
|
<funcprototype>
|
|
<funcdef>int<function> MaxHeight</function></funcdef>
|
|
<paramdef>Widget<parameter> w</parameter></paramdef>
|
|
<paramdef>int<parameter> lines</parameter></paramdef>
|
|
</funcprototype>
|
|
</funcsynopsis>
|
|
<!-- .FN -->
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term>
|
|
<emphasis remap='I'>w</emphasis>
|
|
</term>
|
|
<listitem>
|
|
<para>
|
|
Specifies the TextSink object.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term>
|
|
<emphasis remap='I'>height</emphasis>
|
|
</term>
|
|
<listitem>
|
|
<para>
|
|
Specifies the height of the current drawing area.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</para>
|
|
<para>
|
|
<!-- .LP -->
|
|
Returns the height that will be taken up by the number of lines passed.
|
|
</para>
|
|
</sect3>
|
|
<sect3 id="Setting_the_Tab_Stops">
|
|
<title>Setting the Tab Stops</title>
|
|
<para>
|
|
<!-- .LP -->
|
|
To set the tab stops for a text sink use the <function>SetTabs</function> function.
|
|
The TextSink already defines this function to set the tab x location in
|
|
pixels to be the number of characters times the figure width of
|
|
<function>font</function>.
|
|
<!-- .IN "TextSink object" "SetTabs" "@DEF@" -->
|
|
<funcsynopsis>
|
|
<funcprototype>
|
|
<funcdef>void<function> SetTabs</function></funcdef>
|
|
<paramdef>Widget<parameter> w</parameter></paramdef>
|
|
<paramdef>inttab_count,<parameter> *tabs</parameter></paramdef>
|
|
</funcprototype>
|
|
</funcsynopsis>
|
|
<!-- .FN -->
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term>
|
|
<emphasis remap='I'>w</emphasis>
|
|
</term>
|
|
<listitem>
|
|
<para>
|
|
Specifies the TextSink object.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term>
|
|
<emphasis remap='I'>tab_count</emphasis>
|
|
</term>
|
|
<listitem>
|
|
<para>
|
|
Specifies the number of tabs passed in <emphasis remap='I'>tabs</emphasis>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term>
|
|
<emphasis remap='I'>tabs</emphasis>
|
|
</term>
|
|
<listitem>
|
|
<para>
|
|
Specifies the position, in characters, of the tab stops.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</para>
|
|
<para>
|
|
<!-- .LP -->
|
|
This function is responsible for the converting character positions passed
|
|
to it into whatever internal positions the TextSink uses for tab placement.
|
|
</para>
|
|
</sect3>
|
|
<sect3 id="Getting_the_Insert_Point_s_Size_and_Location">
|
|
<title>Getting the Insert Point's Size and Location</title>
|
|
<para>
|
|
<!-- .LP -->
|
|
To get the size and location of the insert point use the
|
|
<function>GetCursorBounds</function> function.
|
|
<!-- .IN "TextSink object" "GetCursorBounds" "@DEF@" -->
|
|
<funcsynopsis>
|
|
<funcprototype>
|
|
<funcdef>void<function> GetCursorBounds</function></funcdef>
|
|
<paramdef>Widget<parameter> w</parameter></paramdef>
|
|
<paramdef>XRectangle<parameter> *rect_return</parameter></paramdef>
|
|
</funcprototype>
|
|
</funcsynopsis>
|
|
<!-- .FN -->
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term>
|
|
<emphasis remap='I'>w</emphasis>
|
|
</term>
|
|
<listitem>
|
|
<para>
|
|
Specifies the TextSinkObject.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term>
|
|
<emphasis remap='I'>rect_return</emphasis>
|
|
</term>
|
|
<listitem>
|
|
<para>
|
|
Returns the location and size of the insert point.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</para>
|
|
<para>
|
|
<!-- .LP -->
|
|
<emphasis remap='I'>Rect</emphasis> will be filled with the current size and location of the
|
|
insert point.
|
|
|
|
</para>
|
|
</sect3>
|
|
</sect2>
|
|
</sect1>
|