forked from AuroraMiddleware/gtk
675 lines
11 KiB
Plaintext
675 lines
11 KiB
Plaintext
<!-- ##### SECTION Title ##### -->
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GtkLabel
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<!-- ##### SECTION Short_Description ##### -->
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A widget that displays a small to medium amount of text
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<!-- ##### SECTION Long_Description ##### -->
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<para>
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The #GtkLabel widget displays a small amount of text. As the name
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implies, most labels are used to label another widget such as a
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#GtkButton, a #GtkMenuItem, or a #GtkOptionMenu.
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</para>
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<refsect2>
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<title>Mnemonics</title>
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<para>
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Labels may contain <firstterm>mnemonics</firstterm>. Mnemonics are
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underlined characters in the label, used for keyboard navigation.
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Mnemonics are created by providing a string with an underscore before
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the mnemonic character, such as <literal>"_File"</literal>, to the
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functions gtk_label_new_with_mnemonic() or
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gtk_label_set_text_with_mnemonic().
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</para>
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<para>
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Mnemonics automatically activate any activatable widget the label is
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inside, such as a #GtkButton; if the label is not inside the
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mnemonic's target widget, you have to tell the label about the target
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using gtk_label_set_mnemonic_widget(). Here's a simple example where
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the label is inside a button:
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<informalexample>
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<programlisting>
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/* Pressing Alt+H will activate this button */
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button = gtk_button_new (<!-- -->);
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label = gtk_label_new_with_mnemonic ("_Hello");
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gtk_container_add (GTK_CONTAINER (button), label);
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</programlisting>
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</informalexample>
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There's a convenience function to create buttons with a mnemonic label
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already inside:
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<informalexample>
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<programlisting>
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/* Pressing Alt+H will activate this button */
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button = gtk_button_new_with_mnemonic ("_Hello");
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</programlisting>
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</informalexample>
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To create a mnemonic for a widget alongside the label, such as a
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#GtkEntry, you have to point the label at the entry with
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gtk_label_set_mnemonic_widget():
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<informalexample>
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<programlisting>
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/* Pressing Alt+H will focus the entry */
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entry = gtk_entry_new (<!-- -->);
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label = gtk_label_new_with_mnemonic ("_Hello");
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gtk_label_set_mnemonic_widget (GTK_LABEL (label), entry);
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</programlisting>
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</informalexample>
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</para>
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</refsect2>
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<refsect2>
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<title>Markup (styled text)</title>
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<para>
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To make it easy to format text in a label (changing colors, fonts,
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etc.), label text can be provided in a simple <link
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linkend="PangoMarkupFormat">markup format</link>.
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Here's how to create a label with a small font:
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<informalexample>
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<programlisting>
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label = gtk_label_new (NULL);
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gtk_label_set_markup (GTK_LABEL (label), "<small>Small text</small>");
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</programlisting>
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</informalexample>
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(See <link
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linkend="PangoMarkupFormat">complete documentation</link> of available
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tags in the Pango manual.)
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</para>
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<para>
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The markup passed to gtk_label_set_markup() must be valid; for example,
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literal </>/& characters must be escaped as &lt;,
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&gt;, and &amp;. If you pass text obtained from the user, file,
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or a network to gtk_label_set_markup(), you'll want to escape it with
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g_markup_escape_text() or g_markup_printf_escaped().
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</para>
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<para>
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Markup strings are just a convenient way to set the #PangoAttrList on
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a label; gtk_label_set_attributes() may be a simpler way to set
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attributes in some cases. Be careful though; #PangoAttrList tends to
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cause internationalization problems, unless you're applying attributes
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to the entire string (i.e. unless you set the range of each attribute
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to [0, G_MAXINT)). The reason is that specifying the start_index and
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end_index for a #PangoAttribute requires knowledge of the exact string
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being displayed, so translations will cause problems.
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</para>
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</refsect2>
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<refsect2>
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<title>Selectable labels</title>
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<para>
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Labels can be made selectable with gtk_label_set_selectable().
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Selectable labels allow the user to copy the label contents to
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the clipboard. Only labels that contain useful-to-copy information
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— such as error messages — should be made selectable.
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</para>
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</refsect2>
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<refsect2>
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<title>Text layout</title>
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<para>
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A label can contain any number of paragraphs, but will have
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performance problems if it contains more than a small number.
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Paragraphs are separated by newlines or other paragraph separators
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understood by Pango.
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</para>
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<para>
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Labels can automatically wrap text if you call
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gtk_label_set_line_wrap().
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</para>
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<para>
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gtk_label_set_justify() sets how the lines in a label align
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with one another. If you want to set how the label as a whole
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aligns in its available space, see gtk_misc_set_alignment().
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</para>
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</refsect2>
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<!-- ##### SECTION See_Also ##### -->
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<para>
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</para>
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<!-- ##### SECTION Stability_Level ##### -->
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<!-- ##### STRUCT GtkLabel ##### -->
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<para>
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This should not be accessed directly. Use the accessor functions as
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described below.
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</para>
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<!-- ##### SIGNAL GtkLabel::copy-clipboard ##### -->
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<para>
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</para>
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@label: the object which received the signal.
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<!-- ##### SIGNAL GtkLabel::move-cursor ##### -->
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<para>
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</para>
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@label: the object which received the signal.
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@arg1:
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@arg2:
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@arg3:
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<!-- ##### SIGNAL GtkLabel::populate-popup ##### -->
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<para>
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</para>
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@label: the object which received the signal.
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@arg1:
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<!-- ##### ARG GtkLabel:angle ##### -->
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<para>
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</para>
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<!-- ##### ARG GtkLabel:attributes ##### -->
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<para>
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</para>
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<!-- ##### ARG GtkLabel:cursor-position ##### -->
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<para>
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</para>
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<!-- ##### ARG GtkLabel:ellipsize ##### -->
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<para>
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</para>
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<!-- ##### ARG GtkLabel:justify ##### -->
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<para>
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</para>
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<!-- ##### ARG GtkLabel:label ##### -->
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<para>
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</para>
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<!-- ##### ARG GtkLabel:max-width-chars ##### -->
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<para>
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</para>
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<!-- ##### ARG GtkLabel:mnemonic-keyval ##### -->
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<para>
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</para>
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<!-- ##### ARG GtkLabel:mnemonic-widget ##### -->
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<para>
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</para>
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<!-- ##### ARG GtkLabel:pattern ##### -->
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<para>
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</para>
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<!-- ##### ARG GtkLabel:selectable ##### -->
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<para>
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</para>
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<!-- ##### ARG GtkLabel:selection-bound ##### -->
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<para>
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</para>
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<!-- ##### ARG GtkLabel:single-line-mode ##### -->
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<para>
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</para>
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<!-- ##### ARG GtkLabel:use-markup ##### -->
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<para>
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</para>
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<!-- ##### ARG GtkLabel:use-underline ##### -->
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<para>
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</para>
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<!-- ##### ARG GtkLabel:width-chars ##### -->
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<para>
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</para>
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<!-- ##### ARG GtkLabel:wrap ##### -->
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<para>
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</para>
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<!-- ##### ARG GtkLabel:wrap-mode ##### -->
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<para>
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</para>
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<!-- ##### FUNCTION gtk_label_new ##### -->
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<para>
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</para>
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@str:
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@Returns:
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<!-- ##### FUNCTION gtk_label_set_text ##### -->
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<para>
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</para>
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@label:
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@str:
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<!-- ##### FUNCTION gtk_label_set_attributes ##### -->
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<para>
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</para>
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@label:
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@attrs:
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<!-- ##### FUNCTION gtk_label_set_markup ##### -->
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<para>
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</para>
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@label:
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@str:
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<!-- ##### FUNCTION gtk_label_set_markup_with_mnemonic ##### -->
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<para>
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</para>
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@label:
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@str:
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<!-- ##### FUNCTION gtk_label_set_pattern ##### -->
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<para>
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The pattern of underlines you want under the existing text within the
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#GtkLabel widget. For example if the current text of the label says
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"FooBarBaz" passing a pattern of "___ ___" will underline
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"Foo" and "Baz" but not "Bar".
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</para>
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@label: The #GtkLabel you want to set the pattern to.
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@pattern: The pattern as described above.
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<!-- ##### FUNCTION gtk_label_set_justify ##### -->
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<para>
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</para>
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@label:
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@jtype:
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<!-- ##### FUNCTION gtk_label_set_ellipsize ##### -->
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<para>
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</para>
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@label:
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@mode:
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<!-- ##### FUNCTION gtk_label_set_width_chars ##### -->
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<para>
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</para>
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@label:
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@n_chars:
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<!-- ##### FUNCTION gtk_label_set_max_width_chars ##### -->
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<para>
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</para>
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@label:
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@n_chars:
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<!-- ##### FUNCTION gtk_label_get ##### -->
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<para>
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Gets the current string of text within the #GtkLabel and writes it to
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the given @str argument. It does not make a copy of this string so you
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must not write to it.
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</para>
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@label: The #GtkLabel widget you want to get the text from.
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@str: The reference to the pointer you want to point to the text.
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<!-- ##### FUNCTION gtk_label_parse_uline ##### -->
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<para>
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Parses the given string for underscores and converts the next
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character to an underlined character. The last character that
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was underlined will have its lower-cased accelerator keyval returned (i.e.
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"_File" would return the keyval for "f". This is
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probably only used within the GTK+ library itself for menu items and such.
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</para>
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@label: The #GtkLabel you want to affect.
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@string: The string you want to parse for underlines.
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@Returns: The lowercase keyval of the last character underlined.
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<!-- ##### FUNCTION gtk_label_set_line_wrap ##### -->
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<para>
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</para>
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@label:
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@wrap:
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<!-- ##### FUNCTION gtk_label_set_line_wrap_mode ##### -->
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<para>
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</para>
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@label:
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@wrap_mode:
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<!-- ##### MACRO gtk_label_set ##### -->
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<para>
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Aliases gtk_label_set_text(). Probably used for backward compatibility with
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GTK+ 1.0.x.
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</para>
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<!-- ##### FUNCTION gtk_label_get_layout_offsets ##### -->
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<para>
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</para>
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@label:
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@x:
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@y:
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<!-- ##### FUNCTION gtk_label_get_mnemonic_keyval ##### -->
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<para>
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</para>
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@label:
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@Returns:
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<!-- ##### FUNCTION gtk_label_get_selectable ##### -->
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<para>
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</para>
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@label:
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@Returns:
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<!-- ##### FUNCTION gtk_label_get_text ##### -->
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<para>
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</para>
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@label:
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@Returns:
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<!-- ##### FUNCTION gtk_label_new_with_mnemonic ##### -->
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<para>
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</para>
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@str:
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@Returns:
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<!-- ##### FUNCTION gtk_label_select_region ##### -->
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<para>
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</para>
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@label:
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@start_offset:
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@end_offset:
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<!-- ##### FUNCTION gtk_label_set_mnemonic_widget ##### -->
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<para>
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</para>
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@label:
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@widget:
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<!-- ##### FUNCTION gtk_label_set_selectable ##### -->
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<para>
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</para>
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@label:
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@setting:
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<!-- ##### FUNCTION gtk_label_set_text_with_mnemonic ##### -->
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<para>
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</para>
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@label:
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@str:
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<!-- ##### FUNCTION gtk_label_get_attributes ##### -->
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<para>
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</para>
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@label:
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@Returns:
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<!-- ##### FUNCTION gtk_label_get_justify ##### -->
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<para>
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</para>
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@label:
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@Returns:
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<!-- ##### FUNCTION gtk_label_get_ellipsize ##### -->
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<para>
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</para>
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@label:
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@Returns:
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<!-- ##### FUNCTION gtk_label_get_width_chars ##### -->
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<para>
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</para>
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@label:
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@Returns:
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<!-- ##### FUNCTION gtk_label_get_max_width_chars ##### -->
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<para>
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</para>
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@label:
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@Returns:
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<!-- ##### FUNCTION gtk_label_get_label ##### -->
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<para>
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</para>
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@label:
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@Returns:
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<!-- ##### FUNCTION gtk_label_get_layout ##### -->
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<para>
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</para>
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@label:
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@Returns:
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<!-- ##### FUNCTION gtk_label_get_line_wrap ##### -->
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<para>
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</para>
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@label:
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@Returns:
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<!-- ##### FUNCTION gtk_label_get_line_wrap_mode ##### -->
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<para>
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</para>
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@label:
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@Returns:
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<!-- ##### FUNCTION gtk_label_get_mnemonic_widget ##### -->
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<para>
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</para>
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@label:
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@Returns:
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<!-- ##### FUNCTION gtk_label_get_selection_bounds ##### -->
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<para>
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</para>
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@label:
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@start:
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@end:
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@Returns:
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<!-- ##### FUNCTION gtk_label_get_use_markup ##### -->
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<para>
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</para>
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@label:
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@Returns:
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<!-- ##### FUNCTION gtk_label_get_use_underline ##### -->
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<para>
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</para>
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@label:
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@Returns:
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<!-- ##### FUNCTION gtk_label_get_single_line_mode ##### -->
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<para>
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</para>
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@label:
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@Returns:
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<!-- ##### FUNCTION gtk_label_get_angle ##### -->
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<para>
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</para>
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@label:
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@Returns:
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<!-- ##### FUNCTION gtk_label_set_label ##### -->
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<para>
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</para>
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@label:
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@str:
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<!-- ##### FUNCTION gtk_label_set_use_markup ##### -->
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<para>
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</para>
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@label:
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@setting:
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<!-- ##### FUNCTION gtk_label_set_use_underline ##### -->
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<para>
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</para>
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@label:
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@setting:
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<!-- ##### FUNCTION gtk_label_set_single_line_mode ##### -->
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<para>
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</para>
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@label:
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@single_line_mode:
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<!-- ##### FUNCTION gtk_label_set_angle ##### -->
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<para>
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</para>
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@label:
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@angle:
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