forked from AuroraMiddleware/gtk
100 lines
3.4 KiB
Plaintext
100 lines
3.4 KiB
Plaintext
HANDLING WIDGET STYLES
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======================
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A widget gets created with a default style.
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The global default style can be affected by gtk_widget_set_default_style()
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and can be queried by gtk_widget_get_default_style().
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The initial style that is assigned to a widget as default style upon
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creation can be affected by wrapping the widget's creation as follows:
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gtk_widget_push_style (my_style);
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widget = gtk_type_new (gtk_button_get_type ());
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gtk_widget_pop_style ();
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There are certain functions to affect widget styles after a widget's
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creation:
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gtk_widget_set_style ()
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Save the default style and set a user style.
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This will override a previously set user style or
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previously set rc styles.
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gtk_widget_set_rc_style ()
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Set GTK_RC_STYLE to indicate that an rc lookup has been performed.
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If there is an rc style for a widget, set it and save the default style,
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restore the default style otherwise.
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This will override a previously set user style or rc style.
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gtk_widget_ensure_style ()
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Ensure taht the widget either has a user style set, or an rc lookup
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has been performed.
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gtk_rc_get_style ()
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Return an rc style for a widget if there is one.
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gtk_widget_set_name ()
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Change widget name, and perform a new rc lookup if no user style
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is set.
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gtk_widget_realize ()
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Besides realizing the widget this function will:
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- perform an rc lookup if neccessary,
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- attach a widget's style.
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gtk_widget_get_style ()
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Return a widgets style, this function will perform an rc lookup
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if neccessary.
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gtk_widget_set_parent ()
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This function will perform rc lookups recursively for all widgets
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that do not have a user style set.
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gtk_style_copy ()
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This function can be used to copy a widgets style.
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The style can subsequntly be changed (e.g., by modifications to the
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red/green/blue values of a certain color) and then be applied to the
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widget via gtk_widget_set_style().
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GtkWidget::style_set
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This signal will be emitted for a widget once its style changes with
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an additional argument previous_style wich will hold the widget->style
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avlue from a previous emission.
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The initial emission of this signal is guaranteed to happen prior
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to any GtkWidget::size_request emission, and will have the previous_style
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argument set to NULL.
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The GtkWidgetClass implements a default handler for this signal that
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will set the widget's window's background of widgets that provide their
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own windows according to the new style.
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Derived widgets need to overide this default handler, if:
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- their size requisition depends on the current style.
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(e.g., on the style's fonts)
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- they set the background of widget->window to something other than.
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style->bg. (e.g., GtkListItem)
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- the widget provides windows other than widget->window.
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- the widget has any other stored dependencies on the style.
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Flag indications:
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!GTK_RC_STYLE && !GTK_USER_STYLE:
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The widget has it's default style set, no rc lookup has been
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performed, the widget has not been size requested yet and is
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therefore not yet realized.
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GTK_USER_STYLE:
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GTK_RC_STYLE is not set.
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The widget has a user style assigned, and it's default style has been
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saved.
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GTK_RC_STYLE:
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GTK_USER_STYLE is not set.
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If the widget has a saved default style, it has been assigned an
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rc style. If the widget does not have a saved default style, it still
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has its default style but an rc lookup has already been performed.
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- Tim Janik <timj@gimp.org>
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1998/02/27
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