693 lines
20 KiB
XML
693 lines
20 KiB
XML
<sect1 id="Dialog_Widget">
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<title>Dialog Widget</title>
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<para>
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<!-- .LP -->
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<!-- .XS -->
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<!-- Dialog Widget -->
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<!-- .XE -->
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<!-- .IN "Dialog widget" "" "@DEF@" -->
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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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<!-- .sp -->
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Application Header file <X11/Xaw/Dialog.h>
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<!-- .IN "Dialog.h" "" -->
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Class Header file <X11/Xaw/DialogP.h>
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<!-- .IN "DialogP.h" "" -->
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Class dialogWidgetClass
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<!-- .IN "dialogWidgetClass" "" -->
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Class Name Dialog
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<!-- .IN "Dialog widget" "class name" -->
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Superclass Form
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<!-- .sp -->
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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 Dialog widget implements a commonly used interaction semantic to
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prompt for auxiliary input from a user. For example, you can use a
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Dialog widget when an application requires a small piece of information,
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such as a filename, from the user. A Dialog widget, which is simply a
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special case of the Form widget, provides a convenient way to create a
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preconfigured form.
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</para>
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<para>
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<!-- .LP -->
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The typical Dialog widget contains three areas. The first line
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contains a description of the function of the Dialog widget, for
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example, the string <emphasis remap='I'>Filename:</emphasis>. The second line contains an area
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into which the user types input. The third line can contain buttons
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that let the user confirm or cancel the Dialog input. Any of these
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areas may be omitted by the application.
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</para>
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<sect2 id="dialog_resources">
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<title>Resources</title>
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<para>
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<!-- .LP -->
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When creating a Dialog widget instance, the following resources are
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retrieved from the argument list or the resource database:
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<!-- .IN "Dialog widget" "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>accelerators</entry>
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<entry>Accelerators</entry>
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<entry>AcceleratorTable</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>ancestorSensitive</entry>
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<entry>AncestorSensitive</entry>
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<entry>Boolean</entry>
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<entry>D</entry>
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<entry>True</entry>
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</row>
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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>backgroundPixmap</entry>
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<entry>Pixmap</entry>
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<entry>Pixmap</entry>
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<entry></entry>
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<entry>XtUnspecifiedPixmap</entry>
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</row>
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<row>
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<entry>borderColor</entry>
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<entry>BorderColor</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>borderPixmap</entry>
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<entry>Pixmap</entry>
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<entry>Pixmap</entry>
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<entry></entry>
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<entry>XtUnspecifiedPixmap</entry>
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</row>
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<row>
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<entry>borderWidth</entry>
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<entry>BorderWidth</entry>
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<entry>Dimension</entry>
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<entry></entry>
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<entry>1</entry>
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</row>
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<row>
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<entry>children</entry>
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<entry>ReadOnly</entry>
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<entry>WidgetList</entry>
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<entry>R</entry>
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<entry>NULL</entry>
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</row>
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<row>
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<entry>colormap</entry>
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<entry>Colormap</entry>
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<entry>Colormap</entry>
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<entry></entry>
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<entry>Parent's Colormap</entry>
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</row>
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<row>
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<entry>defaultDistance</entry>
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<entry>Thickness</entry>
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<entry>int</entry>
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<entry></entry>
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<entry>4</entry>
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</row>
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<row>
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<entry>depth</entry>
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<entry>Depth</entry>
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<entry>int</entry>
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<entry>C</entry>
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<entry>Parent's Depth</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>height</entry>
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<entry>Height</entry>
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<entry>Dimension</entry>
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<entry>A</entry>
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<entry>Enough space to contain all children</entry>
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</row>
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<row>
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<entry>icon</entry>
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<entry>Icon</entry>
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<entry>Bitmap</entry>
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<entry></entry>
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<entry>None</entry>
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</row>
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<row>
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<entry>label</entry>
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<entry>Label</entry>
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<entry>String</entry>
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<entry></entry>
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<entry>"label"</entry>
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</row>
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<row>
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<entry>mappedWhenManaged</entry>
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<entry>MappedWhenManaged</entry>
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<entry>Boolean</entry>
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<entry></entry>
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<entry>True</entry>
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</row>
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<row>
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<entry>numChildren</entry>
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<entry>ReadOnly</entry>
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<entry>Cardinal</entry>
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<entry>R</entry>
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<entry>0</entry>
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</row>
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<row>
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<entry>screen</entry>
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<entry>Screen</entry>
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<entry>Screen</entry>
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<entry>R</entry>
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<entry>Parent's Screen</entry>
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</row>
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<row>
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<entry>sensitive</entry>
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<entry>Sensitive</entry>
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<entry>Boolean</entry>
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<entry></entry>
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<entry>True</entry>
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</row>
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<row>
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<entry>translations</entry>
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<entry>Translations</entry>
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<entry>TranslationTable</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>value</entry>
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<entry>Value</entry>
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<entry>String</entry>
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<entry></entry>
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<entry>no value widget</entry>
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</row>
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<row>
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<entry>width</entry>
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<entry>Width</entry>
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<entry>Dimension</entry>
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<entry>A</entry>
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<entry>Enough space to contain all children</entry>
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</row>
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<row>
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<entry>x</entry>
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<entry>Position</entry>
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<entry>Position</entry>
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<entry></entry>
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<entry>0</entry>
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</row>
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<row>
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<entry>y</entry>
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<entry>Position</entry>
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<entry>Position</entry>
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<entry></entry>
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<entry>0</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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<!-- .Ac -->
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<!-- .As -->
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<!-- .Bg -->
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<!-- .Gp -->
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<!-- .Bc -->
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<!-- .Bp -->
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<!-- .Bw -->
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<!-- .Ch -->
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<!-- .Cm -->
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<!-- .Dd -->
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<!-- .Dp -->
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<!-- .Dc -->
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<!-- .Hw -->
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<variablelist>
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<varlistentry>
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<term>
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<function>icon</function>
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</term>
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<listitem>
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<para>
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A pixmap image to be displayed immediately to the left of the
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Dialog widget's label.
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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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<function>label</function>
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</term>
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<listitem>
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<para>
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A string to be displayed at the top of the Dialog widget.
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<!-- .Mm -->
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<!-- .Nc -->
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<!-- .Sc -->
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<!-- .Se -->
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<!-- .Tr -->
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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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<function>value</function>
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</term>
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<listitem>
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<para>
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An initial value for the string field that the user will enter text
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into. By default, no text entry field is available to the user.
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Specifying an initial value for <function>value</function> activates the text entry
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field. If string input is desired, but no initial value is to be
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specified then set this resource to "" (empty string).
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<!-- .Xy -->
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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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</sect2>
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<sect2 id="Constraint_Resources">
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<title>Constraint Resources</title>
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<para>
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<!-- .LP -->
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<!-- .IN "Dialog widget" "constraint resources" -->
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Each child of the Dialog widget may request special layout resources
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be applied to it. These <emphasis remap='I'>constraint</emphasis> resources allow the Dialog
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widget's children to specify individual layout requirements.
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</para>
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<para>
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<!-- .LP -->
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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>bottom</entry>
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<entry>Edge</entry>
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<entry>XawEdgeType</entry>
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<entry></entry>
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<entry>XawRubber</entry>
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</row>
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<row>
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<entry>fromHoriz</entry>
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<entry>Widget</entry>
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<entry>Widget</entry>
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<entry></entry>
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<entry>NULL (left edge of Dialog)</entry>
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</row>
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<row>
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<entry>fromVert</entry>
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<entry>Widget</entry>
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<entry>Widget </entry>
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<entry></entry>
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<entry>NULL (top edge of Dialog)</entry>
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</row>
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<row>
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<entry>horizDistance</entry>
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<entry>Thickness</entry>
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<entry>int</entry>
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<entry></entry>
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<entry><function>defaultDistance</function> resource</entry>
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</row>
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<row>
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<entry>left</entry>
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<entry>Edge</entry>
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<entry>XawEdgeType</entry>
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<entry></entry>
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<entry>XawRubber</entry>
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</row>
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<row>
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<entry>resizable</entry>
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<entry>Boolean</entry>
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<entry>Boolean</entry>
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<entry></entry>
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<entry>FALSE</entry>
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</row>
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<row>
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<entry>right</entry>
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<entry>Edge</entry>
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<entry>XawEdgeType</entry>
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<entry></entry>
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<entry>XawRubber</entry>
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</row>
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<row>
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<entry>top</entry>
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<entry>Edge</entry>
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<entry>XawEdgeType</entry>
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<entry></entry>
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<entry>XawRubber</entry>
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</row>
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<row>
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<entry>vertDistance</entry>
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<entry>Thickness</entry>
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<entry>int</entry>
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<entry></entry>
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<entry><function>defaultDistance</function> resource</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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<literallayout class="monospaced">
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bottom
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left
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right
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top What to do with this edge of the child when
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the parent is resized. This resource may be
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any edgeType. See Layout Semantics for
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details.
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fromHoriz
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fromVert Which widget this child should be placed
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underneath (or to the right of). If a value
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of NULL is specified then this widget will be
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positioned relative to the edge of the par-
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ent.
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horizDistance
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vertDistance The amount of space, in pixels, between this
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child and its left or upper neighbor.
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resizable If this resource is False then the parent
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widget will ignore all geometry request made
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by this child. The parent may still resize
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this child itself, however.
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</literallayout>
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<!-- .Bt -->
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<!-- .Fh -->
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<!-- .Hd -->
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<!-- .Rl -->
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</para>
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</sect2>
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<sect2 id="dialog_layout_semantics">
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<title>Layout Semantics</title>
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<!-- .IN "Dialog widget" "layout semantics" -->
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<para>
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The Dialog widget uses two different sets of layout seman-
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tics. One is used when initially laying out the children.
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The other is used when the Dialog is resized.
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</para>
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<para>
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The first layout method uses the <function>fromVert</function> mand <function>fromHoriz</function>
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resources to place the children of the Dialog. A single
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pass is made through the Dialog widget's children in the
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order that they were created. Each child is then placed in
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the Dialog widget below or to the right of the widget speci-
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fied by the <function>fromVert</function> mand <function>fromHoriz</function> mresources. The distance
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the new child is placed from its left or upper neighbor is
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determined by the <function>horizDistance</function> mand <function>vertDistance</function> mresources.
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This implies some things about how the order of creation
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affects the possible placement of the children. The Form
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widget registers a string to widget converter which does not
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postpone conversion and does not cache conversion results.
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</para>
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<para>
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The second layout method is used when the Dialog is resized.
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It does not matter what causes this resize, and it is possi-
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ble for a resize to happen before the widget becomes visible
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(due to constraints imposed by the parent of the Dialog).
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This layout method uses the <function>bottom</function> ,
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<function>top</function> , <function>left</function> , and
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<function>right</function>
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resources. These resources are used to determine what will
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happen to each edge of the child when the Dialog is resized.
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If a value of <function>XawChain</function>
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<emphasis remap='I'><something></emphasis>
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is specified, the the edge
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of the child will remain a fixed distance from the <emphasis remap='I'>chain</emphasis>
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edge of the Dialog. For example if <function>XawChainLeft</function>
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mis specified for the <function>right</function> mresource of a child
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then the right edge
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of that child will remain a fixed distance from the left
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edge of the Dialog widget. If a value of <function>XawRubber</function> mis spec-
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ified, that edge will grow by the same percentage that the
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Dialog grew. For instance if the Dialog grows by 50% the
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left edge of the child (if specified as <function>XawRubber</function> mwill be
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50% farther from the left edge of the Dialog). One must be
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very careful when specifying these resources, for when they
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are specified incorrectly children may overlap or completely
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occlude other children when the Dialog widget is resized.
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</para>
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<para>
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<!-- .LP -->
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<informaltable>
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<tgroup cols='3' 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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<thead>
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<row>
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<entry>Edge Type</entry>
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<entry>Resource Name</entry>
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<entry>Description</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>XawChainBottom</entry>
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<entry>ChainBottom</entry>
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<entry>Edge remains a fixed distance from bottom of Dialog</entry>
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</row>
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<row>
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<entry>XawChainLeft</entry>
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<entry>ChainLeft</entry>
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<entry>Edge remains a fixed distance from left of Dialog</entry>
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</row>
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<row>
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<entry>XawChainRight</entry>
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<entry>ChainRight</entry>
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<entry>Edge remains a fixed distance from right of Dialog</entry>
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</row>
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<row>
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<entry>XawChainTop</entry>
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<entry>ChainTop</entry>
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<entry>Edge remains a fixed distance from top of Dialog</entry>
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</row>
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<row>
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<entry>XawRubber</entry>
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<entry>Rubber</entry>
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<entry>Edges will move a proportional distance</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="Example">
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<title>Example</title>
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<para>
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<!-- .LP -->
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If you wish to force the Dialog to never resize one or more of its children
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then set <function>left</function> and <function>right</function> to <function>XawChainLeft</function> and
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<function>top</function> and <function>bottom</function> to <function>XawChainTop</function>. This will cause
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the child to remain a fixed distance from the top and left
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edges of the Dialog, and to never resize.
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</para>
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</sect3>
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<sect3 id="Special_Considerations">
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<title>Special Considerations</title>
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<!-- .IN "Dialog widget" "special considerations" -->
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<para>
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<!-- .LP -->
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The Dialog widget automatically sets the <function>top</function> and <function>bottom</function>
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resources for all Children that are subclasses of the Command widget,
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as well as the widget children that are used to contain the <function>label</function>,
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<function>value</function>, and <function>icon</function>. This policy allows the buttons at the
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bottom of the Dialog to interact correctly with the predefined children,
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and makes it possible for a client to simply create and manage a new
|
|
Command button without having to specify its constraints.
|
|
</para>
|
|
<para>
|
|
<!-- .LP -->
|
|
The Dialog will also set <function>fromLeft</function> to the last button in the
|
|
<!-- .IN "fromLeft" "" -->
|
|
Dialog for each new button added to the Dialog widget.
|
|
</para>
|
|
<para>
|
|
<!-- .LP -->
|
|
The automatically added constraints cannot be overridden, as they are
|
|
policy decisions of the Dialog widget. If a more flexible Dialog is
|
|
desired, the application is free to use the Form widget to create its
|
|
own Dialog policy.
|
|
</para>
|
|
</sect3>
|
|
</sect2>
|
|
<sect2 id="Automatically_Created_Children_">
|
|
<title>Automatically Created Children.</title>
|
|
<!-- .IN "Dialog widget" "automatically created children" -->
|
|
<para>
|
|
<!-- .LP -->
|
|
The Dialog uses Label widgets to contain the <function>label</function> and <function>icon</function>.
|
|
These widgets are named <emphasis remap='I'>label</emphasis> and <emphasis remap='I'>icon</emphasis> respectively. The
|
|
Dialog <function>value</function> is contained in an AsciiText widget whose name is
|
|
<function>value</function>. Using <function>XtNameToWidget</function> the application can change
|
|
<!-- .IN "XtNameToWidget" "" -->
|
|
those resources associated with each of these widgets that are not
|
|
available through the Dialog widget itself.
|
|
</para>
|
|
<para>
|
|
<!-- .LP -->
|
|
</para>
|
|
</sect2>
|
|
<sect2 id="dialog_convenience_routines">
|
|
<title>Convenience Routines</title>
|
|
<para>
|
|
<!-- .LP -->
|
|
To return the character string in the text field, use
|
|
<!-- .PN XawDialogGetValueString . -->
|
|
<!-- .IN "XawDialogGetValueString" "" "@DEF@" -->
|
|
<funcsynopsis>
|
|
<funcprototype>
|
|
<funcdef>String<function> XawDialogGetValueString</function></funcdef>
|
|
<paramdef>Widget<parameter> w</parameter></paramdef>
|
|
</funcprototype>
|
|
</funcsynopsis>
|
|
<!-- .FN -->
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term>
|
|
<emphasis remap='I'>w</emphasis>
|
|
</term>
|
|
<listitem>
|
|
<para>
|
|
Specifies the Dialog widget.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</para>
|
|
<para>
|
|
<!-- .LP -->
|
|
This function returns a copy of the value string of the Dialog
|
|
widget. This string is allocated by the AsciiText widget and will
|
|
remain valid and unchanged until another call to
|
|
<function>XawDialogGetValueString</function> or an <function>XtGetValues</function> call on the
|
|
<function>value</function> widget, when the string will be automatically freed, and
|
|
a new string is returned. This string may be freed earlier by calling
|
|
the function <function>XawAsciiSourceFreeString</function>.
|
|
<!-- .IN "XawAsciiSourceFreeString" "" -->
|
|
</para>
|
|
<para>
|
|
<!-- .LP -->
|
|
<!-- .sp -->
|
|
To add a new button to the Dialog widget use
|
|
<function>XawDialogAddButton</function>.
|
|
<!-- .IN "XawDialogAddButton" "" "@DEF@" -->
|
|
<funcsynopsis>
|
|
<funcprototype>
|
|
<funcdef>void<function> XawDialogAddButton</function></funcdef>
|
|
<paramdef>Widget<parameter> w</parameter></paramdef>
|
|
<paramdef>String<parameter> name</parameter></paramdef>
|
|
<paramdef>XtCallbackProc<parameter> func</parameter></paramdef>
|
|
<paramdef>XtPointer<parameter> client_data</parameter></paramdef>
|
|
</funcprototype>
|
|
</funcsynopsis>
|
|
<!-- .FN -->
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term>
|
|
<emphasis remap='I'>w</emphasis>
|
|
</term>
|
|
<listitem>
|
|
<para>
|
|
Specifies the Dialog widget.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term>
|
|
<emphasis remap='I'>name</emphasis>
|
|
</term>
|
|
<listitem>
|
|
<para>
|
|
Specifies the name of the new Command button to be added to the Dialog.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term>
|
|
<emphasis remap='I'>func</emphasis>
|
|
</term>
|
|
<listitem>
|
|
<para>
|
|
Specifies a callback function to be called when this button is activated. If
|
|
NULL is specified then no callback is added.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term>
|
|
<emphasis remap='I'>client_data</emphasis>
|
|
</term>
|
|
<listitem>
|
|
<para>
|
|
Specifies the client_data to be passed to the <emphasis remap='I'>func</emphasis>.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</para>
|
|
<para>
|
|
<!-- .LP -->
|
|
This function is merely a shorthand for the code sequence:
|
|
<!-- .sp -->
|
|
<literallayout class="monospaced">
|
|
<!-- .SM -->
|
|
<!-- .TA 1i 2i -->
|
|
<!-- .ta 1i 2i -->
|
|
{
|
|
Widget button = XtCreateManagedWidget(name, commandWidgetClass, w, NULL, ZERO);
|
|
XtAddCallback(button, XtNcallback, func, client_data);
|
|
}
|
|
<!-- .NL -->
|
|
</literallayout>
|
|
<!-- .sp -->
|
|
|
|
</para>
|
|
</sect2>
|
|
</sect1>
|