forked from AuroraMiddleware/gtk
9d2a946813
Sun Jul 18 17:21:10 2004 Soeren Sandmann <sandmann@daimi.au.dk>
* === Released 2.5.0 ===
* NEWS: updates
* tests/testcombo.c: Fix compilation
180 lines
4.2 KiB
Plaintext
180 lines
4.2 KiB
Plaintext
<!-- ##### SECTION Title ##### -->
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GtkScale
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<!-- ##### SECTION Short_Description ##### -->
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a base class for #GtkHScale and #GtkVScale.
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<!-- ##### SECTION Long_Description ##### -->
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<para>
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A #GtkScale is a slider control used to select a numeric value.
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To use it, you'll probably want to investigate the methods on
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its base class, #GtkRange, in addition to the methods for #GtkScale itself.
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To set the value of a scale, you would normally use gtk_range_set_value().
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To detect changes to the value, you would normally use the "value_changed"
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signal.
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</para>
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<para>
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The #GtkScale widget is an abstract class, used only for deriving the
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subclasses #GtkHScale and #GtkVScale. To create a scale widget,
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call gtk_hscale_new_with_range() or gtk_vscale_new_with_range().
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</para>
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<!-- ##### SECTION See_Also ##### -->
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<para>
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</para>
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<!-- ##### STRUCT GtkScale ##### -->
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<para>
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The #GtkScale-struct struct contains the following fields.
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(These fields should be considered read-only. They should never be set by
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an application.)
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<informaltable pgwide="1" frame="none" role="struct">
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<tgroup cols="2"><colspec colwidth="2*"/><colspec colwidth="8*"/>
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<tbody>
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<row>
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<entry>#guint <structfield>draw_value</structfield>;</entry>
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<entry>non-zero if the scale's current value is displayed next to the
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slider.</entry>
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</row>
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<row>
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<entry>#guint <structfield>value_pos</structfield>;</entry>
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<entry>the position in which the textual value is displayed, selected from
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#GtkPositionType.</entry>
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</row>
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</tbody></tgroup></informaltable>
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</para>
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<!-- ##### SIGNAL GtkScale::format-value ##### -->
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<para>
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Signal which allows you to change how the scale value is displayed. Connect a
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signal handler which returns an allocated string representing @value.
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That string will then be used to display the scale's value.
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Here's an example signal handler which displays a value 1.0 as
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with "-->1.0<--".
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<informalexample><programlisting>
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static gchar*
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format_value_callback (GtkScale *scale,
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gdouble value)
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{
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return g_strdup_printf ("-->%0.*g<--",
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gtk_scale_get_digits (scale), value);
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}
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</programlisting></informalexample>
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</para>
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@scale: the object which received the signal.
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@arg1:
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@Returns: allocated string representing @value
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<!-- # Unused Parameters # -->
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@value: value to format
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<!-- ##### ARG GtkScale:digits ##### -->
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<para>
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</para>
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<!-- ##### ARG GtkScale:draw-value ##### -->
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<para>
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</para>
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<!-- ##### ARG GtkScale:value-pos ##### -->
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<para>
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</para>
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<!-- ##### ARG GtkScale:slider-length ##### -->
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<para>
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</para>
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<!-- ##### ARG GtkScale:value-spacing ##### -->
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<para>
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</para>
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<!-- ##### FUNCTION gtk_scale_set_digits ##### -->
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<para>
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Sets the number of decimal places that are displayed in the value. Also causes
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the value of the adjustment to be rounded off to this number of digits, so the
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retrieved value matches the value the user saw.
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</para>
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@scale: a #GtkScale.
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@digits: the number of decimal places to display, e.g. use 1 to display 1.0,
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2 to display 1.00 etc.
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<!-- ##### FUNCTION gtk_scale_set_draw_value ##### -->
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<para>
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Specifies whether the current value is displayed as a string next to the
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slider.
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</para>
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@scale: a #GtkScale.
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@draw_value: a boolean.
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<!-- ##### FUNCTION gtk_scale_set_value_pos ##### -->
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<para>
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Sets the position in which the current value is displayed.
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</para>
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@scale: a #GtkScale.
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@pos: the position in which the current value is displayed.
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<!-- ##### FUNCTION gtk_scale_get_digits ##### -->
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<para>
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Gets the number of decimal places that are displayed in the value.
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</para>
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@scale: a #GtkScale.
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@Returns: the number of decimal places that are displayed.
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<!-- ##### FUNCTION gtk_scale_get_draw_value ##### -->
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<para>
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Returns whether the current value is displayed as a string next to the
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slider.
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</para>
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@scale: a #GtkScale.
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@Returns: whether the current value is displayed as a string.
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<!-- ##### FUNCTION gtk_scale_get_value_pos ##### -->
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<para>
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Gets the position in which the current value is displayed.
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</para>
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@scale: a #GtkScale.
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@Returns: the position in which the current value is displayed.
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<!-- ##### FUNCTION gtk_scale_get_layout ##### -->
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<para>
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</para>
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@scale:
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@Returns:
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<!-- ##### FUNCTION gtk_scale_get_layout_offsets ##### -->
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<para>
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</para>
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@scale:
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@x:
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@y:
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