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