mirror of
https://gitlab.gnome.org/GNOME/gtk.git
synced 2024-09-30 11:07:38 +00:00
Added "fit-model" and "draw-sensitive" properties to GtkCellView
- "fit-model" decides that the cellview should request space for the entire treemodel, this ensures the cell view displayed on a combo box will not spuriously change size when the selected item changes. - "draw-sensitive" forces cell area to render cells sensitive even if they are insensitive in the model.
This commit is contained in:
Tristan Van Berkom
parent
d48690c32c
commit
e1ecd34ce1
@ -42,22 +42,6 @@
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* and drag and drop.
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*/
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struct _GtkCellViewPrivate
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{
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GtkTreeModel *model;
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GtkTreeRowReference *displayed_row;
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GtkCellArea *area;
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GtkCellAreaContext *context;
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GdkRGBA background;
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gboolean background_set;
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gulong size_changed_id;
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gulong row_changed_id;
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};
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static GObject *gtk_cell_view_constructor (GType type,
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guint n_construct_properties,
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GObjectConstructParam *construct_properties);
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@ -123,6 +107,25 @@ static void row_changed_cb (GtkTreeModel
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GtkTreeIter *iter,
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GtkCellView *view);
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struct _GtkCellViewPrivate
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{
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GtkTreeModel *model;
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GtkTreeRowReference *displayed_row;
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GtkCellArea *area;
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GtkCellAreaContext *context;
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GdkRGBA background;
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gboolean background_set;
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gulong size_changed_id;
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gulong row_changed_id;
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guint32 draw_sensitive : 1;
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guint32 fit_model : 1;
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};
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static GtkBuildableIface *parent_buildable_iface;
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enum
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@ -134,7 +137,9 @@ enum
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PROP_BACKGROUND_SET,
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PROP_MODEL,
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PROP_CELL_AREA,
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PROP_CELL_AREA_CONTEXT
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PROP_CELL_AREA_CONTEXT,
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PROP_DRAW_SENSITIVE,
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PROP_FIT_MODEL
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};
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G_DEFINE_TYPE_WITH_CODE (GtkCellView, gtk_cell_view, GTK_TYPE_WIDGET,
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@ -143,7 +148,6 @@ G_DEFINE_TYPE_WITH_CODE (GtkCellView, gtk_cell_view, GTK_TYPE_WIDGET,
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G_IMPLEMENT_INTERFACE (GTK_TYPE_BUILDABLE,
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gtk_cell_view_buildable_init))
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static void
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gtk_cell_view_class_init (GtkCellViewClass *klass)
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{
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@ -240,6 +244,43 @@ gtk_cell_view_class_init (GtkCellViewClass *klass)
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GTK_TYPE_CELL_AREA_CONTEXT,
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GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
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/**
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* GtkCellView:draw-sensitive
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*
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* Whether all cells should be draw as sensitive for this view regardless
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* of the actual cell properties (used to make menus with submenus appear
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* sensitive when the items in submenus might be insensitive).
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*
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* since 3.0
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*/
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g_object_class_install_property (gobject_class,
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PROP_DRAW_SENSITIVE,
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g_param_spec_boolean ("draw-sensitive",
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P_("Draw Sensitive"),
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P_("Whether to force cells to be drawn in a "
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"sensitive state"),
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FALSE,
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GTK_PARAM_READWRITE));
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/**
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* GtkCellView:fit-model
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*
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* Whether the view should request enough space to always fit
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* the size of every row in the model (used by the combo box to
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* ensure the combo box size doesnt change when different items
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* are selected).
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*
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* since 3.0
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*/
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g_object_class_install_property (gobject_class,
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PROP_FIT_MODEL,
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g_param_spec_boolean ("fit-model",
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P_("Fit Model"),
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P_("Whether to request enough space for "
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"every row in the model"),
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FALSE,
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GTK_PARAM_READWRITE));
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#define ADD_SET_PROP(propname, propval, nick, blurb) g_object_class_install_property (gobject_class, propval, g_param_spec_boolean (propname, nick, blurb, FALSE, GTK_PARAM_READWRITE))
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@ -307,36 +348,42 @@ gtk_cell_view_get_property (GObject *object,
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switch (param_id)
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{
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case PROP_BACKGROUND_GDK:
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{
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GdkColor color;
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color.red = (guint) (view->priv->background.red * 65535);
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color.green = (guint) (view->priv->background.green * 65535);
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color.blue = (guint) (view->priv->background.blue * 65535);
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color.pixel = 0;
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g_value_set_boxed (value, &color);
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}
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break;
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case PROP_BACKGROUND_RGBA:
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g_value_set_boxed (value, &view->priv->background);
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break;
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case PROP_BACKGROUND_SET:
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g_value_set_boolean (value, view->priv->background_set);
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break;
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case PROP_MODEL:
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g_value_set_object (value, view->priv->model);
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break;
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case PROP_CELL_AREA:
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g_value_set_object (value, view->priv->area);
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break;
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case PROP_CELL_AREA_CONTEXT:
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g_value_set_object (value, view->priv->context);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
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break;
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case PROP_BACKGROUND_GDK:
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{
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GdkColor color;
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color.red = (guint) (view->priv->background.red * 65535);
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color.green = (guint) (view->priv->background.green * 65535);
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color.blue = (guint) (view->priv->background.blue * 65535);
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color.pixel = 0;
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g_value_set_boxed (value, &color);
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}
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break;
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case PROP_BACKGROUND_RGBA:
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g_value_set_boxed (value, &view->priv->background);
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break;
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case PROP_BACKGROUND_SET:
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g_value_set_boolean (value, view->priv->background_set);
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break;
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case PROP_MODEL:
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g_value_set_object (value, view->priv->model);
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break;
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case PROP_CELL_AREA:
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g_value_set_object (value, view->priv->area);
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break;
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case PROP_CELL_AREA_CONTEXT:
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g_value_set_object (value, view->priv->context);
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break;
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case PROP_DRAW_SENSITIVE:
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g_value_set_boolean (value, view->priv->draw_sensitive);
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break;
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case PROP_FIT_MODEL:
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g_value_set_boolean (value, view->priv->fit_model);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
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break;
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}
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}
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@ -352,47 +399,55 @@ gtk_cell_view_set_property (GObject *object,
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switch (param_id)
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{
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case PROP_BACKGROUND:
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{
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GdkColor color;
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if (!g_value_get_string (value))
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gtk_cell_view_set_background_color (view, NULL);
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else if (gdk_color_parse (g_value_get_string (value), &color))
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gtk_cell_view_set_background_color (view, &color);
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else
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g_warning ("Don't know color `%s'", g_value_get_string (value));
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g_object_notify (object, "background-gdk");
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}
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break;
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case PROP_BACKGROUND_GDK:
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gtk_cell_view_set_background_color (view, g_value_get_boxed (value));
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break;
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case PROP_BACKGROUND_RGBA:
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gtk_cell_view_set_background_rgba (view, g_value_get_boxed (value));
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break;
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case PROP_BACKGROUND_SET:
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view->priv->background_set = g_value_get_boolean (value);
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break;
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case PROP_MODEL:
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gtk_cell_view_set_model (view, g_value_get_object (value));
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break;
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case PROP_BACKGROUND:
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{
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GdkColor color;
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if (!g_value_get_string (value))
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gtk_cell_view_set_background_color (view, NULL);
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else if (gdk_color_parse (g_value_get_string (value), &color))
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gtk_cell_view_set_background_color (view, &color);
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else
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g_warning ("Don't know color `%s'", g_value_get_string (value));
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g_object_notify (object, "background-gdk");
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}
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break;
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case PROP_BACKGROUND_GDK:
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gtk_cell_view_set_background_color (view, g_value_get_boxed (value));
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break;
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case PROP_BACKGROUND_RGBA:
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gtk_cell_view_set_background_rgba (view, g_value_get_boxed (value));
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break;
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case PROP_BACKGROUND_SET:
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view->priv->background_set = g_value_get_boolean (value);
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break;
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case PROP_MODEL:
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gtk_cell_view_set_model (view, g_value_get_object (value));
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break;
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case PROP_CELL_AREA:
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/* Construct-only, can only be assigned once */
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area = g_value_get_object (value);
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if (area)
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view->priv->area = g_object_ref_sink (area);
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break;
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case PROP_CELL_AREA_CONTEXT:
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/* Construct-only, can only be assigned once */
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context = g_value_get_object (value);
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if (context)
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view->priv->context = g_object_ref (context);
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break;
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case PROP_DRAW_SENSITIVE:
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gtk_cell_view_set_draw_sensitive (view, g_value_get_boolean (value));
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break;
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case PROP_FIT_MODEL:
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gtk_cell_view_set_fit_model (view, g_value_get_boolean (value));
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, param_id, pspec);
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break;
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@ -469,6 +524,166 @@ gtk_cell_view_size_allocate (GtkWidget *widget,
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}
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}
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static void
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gtk_cell_view_request_model (GtkCellView *cellview,
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GtkTreeIter *parent,
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GtkOrientation orientation,
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gint for_size,
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gint *minimum_size,
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gint *natural_size)
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{
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GtkCellViewPrivate *priv = cellview->priv;
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GtkTreeIter iter;
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gboolean valid;
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valid = gtk_tree_model_iter_children (priv->model, &iter, parent);
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while (valid)
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{
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gint min, nat;
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gtk_cell_area_apply_attributes (priv->area, priv->model, &iter, FALSE, FALSE);
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if (orientation == GTK_ORIENTATION_HORIZONTAL)
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{
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if (for_size < 0)
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gtk_cell_area_get_preferred_width (priv->area, priv->context,
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GTK_WIDGET (cellview), &min, &nat);
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else
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gtk_cell_area_get_preferred_width_for_height (priv->area, priv->context,
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GTK_WIDGET (cellview), for_size, &min, &nat);
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}
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else
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{
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if (for_size < 0)
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gtk_cell_area_get_preferred_height (priv->area, priv->context,
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GTK_WIDGET (cellview), &min, &nat);
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else
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gtk_cell_area_get_preferred_height_for_width (priv->area, priv->context,
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GTK_WIDGET (cellview), for_size, &min, &nat);
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}
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*minimum_size = MAX (min, *minimum_size);
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*natural_size = MAX (nat, *natural_size);
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/* Recurse into children when they exist */
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gtk_cell_view_request_model (cellview, &iter, orientation, for_size, minimum_size, natural_size);
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valid = gtk_tree_model_iter_next (priv->model, &iter);
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}
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}
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static void
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gtk_cell_view_get_preferred_width (GtkWidget *widget,
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gint *minimum_size,
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gint *natural_size)
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{
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GtkCellView *cellview = GTK_CELL_VIEW (widget);
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GtkCellViewPrivate *priv = cellview->priv;
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g_signal_handler_block (priv->context, priv->size_changed_id);
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if (priv->fit_model)
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{
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gint min = 0, nat = 0;
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gtk_cell_view_request_model (cellview, NULL, GTK_ORIENTATION_HORIZONTAL, -1, &min, &nat);
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}
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else
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{
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if (cellview->priv->displayed_row)
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gtk_cell_view_set_cell_data (cellview);
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gtk_cell_area_get_preferred_width (priv->area, priv->context, widget, NULL, NULL);
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}
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gtk_cell_area_context_sum_preferred_width (priv->context);
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gtk_cell_area_context_get_preferred_width (priv->context, minimum_size, natural_size);
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g_signal_handler_unblock (priv->context, priv->size_changed_id);
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}
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static void
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gtk_cell_view_get_preferred_height (GtkWidget *widget,
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gint *minimum_size,
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gint *natural_size)
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{
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GtkCellView *cellview = GTK_CELL_VIEW (widget);
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GtkCellViewPrivate *priv = cellview->priv;
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g_signal_handler_block (priv->context, priv->size_changed_id);
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if (priv->fit_model)
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{
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gint min = 0, nat = 0;
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gtk_cell_view_request_model (cellview, NULL, GTK_ORIENTATION_VERTICAL, -1, &min, &nat);
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}
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else
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{
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if (cellview->priv->displayed_row)
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gtk_cell_view_set_cell_data (cellview);
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gtk_cell_area_get_preferred_height (priv->area, priv->context, widget, NULL, NULL);
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}
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gtk_cell_area_context_sum_preferred_height (priv->context);
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gtk_cell_area_context_get_preferred_height (priv->context, minimum_size, natural_size);
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g_signal_handler_unblock (priv->context, priv->size_changed_id);
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}
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static void
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gtk_cell_view_get_preferred_width_for_height (GtkWidget *widget,
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gint for_size,
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gint *minimum_size,
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gint *natural_size)
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{
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GtkCellView *cellview = GTK_CELL_VIEW (widget);
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GtkCellViewPrivate *priv = cellview->priv;
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if (priv->fit_model)
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{
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gint min = 0, nat = 0;
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gtk_cell_view_request_model (cellview, NULL, GTK_ORIENTATION_HORIZONTAL, for_size, &min, &nat);
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*minimum_size = min;
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*natural_size = nat;
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}
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else
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{
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if (cellview->priv->displayed_row)
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gtk_cell_view_set_cell_data (cellview);
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gtk_cell_area_get_preferred_width_for_height (priv->area, priv->context, widget,
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for_size, minimum_size, natural_size);
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}
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}
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static void
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gtk_cell_view_get_preferred_height_for_width (GtkWidget *widget,
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gint for_size,
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gint *minimum_size,
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gint *natural_size)
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{
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GtkCellView *cellview = GTK_CELL_VIEW (widget);
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GtkCellViewPrivate *priv = cellview->priv;
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if (priv->fit_model)
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{
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gint min = 0, nat = 0;
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gtk_cell_view_request_model (cellview, NULL, GTK_ORIENTATION_VERTICAL, for_size, &min, &nat);
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*minimum_size = min;
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*natural_size = nat;
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}
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else
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{
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if (cellview->priv->displayed_row)
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gtk_cell_view_set_cell_data (cellview);
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gtk_cell_area_get_preferred_height_for_width (priv->area, priv->context, widget,
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for_size, minimum_size, natural_size);
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}
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}
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static gboolean
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gtk_cell_view_draw (GtkWidget *widget,
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cairo_t *cr)
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@ -531,6 +746,20 @@ gtk_cell_view_set_cell_data (GtkCellView *cell_view)
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gtk_cell_area_apply_attributes (cell_view->priv->area,
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cell_view->priv->model,
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&iter, FALSE, FALSE);
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if (cell_view->priv->draw_sensitive)
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{
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GList *l, *cells =
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gtk_cell_layout_get_cells (GTK_CELL_LAYOUT (cell_view->priv->area));
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for (l = cells; l; l = l->next)
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{
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GObject *renderer = l->data;
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g_object_set (renderer, "sensitive", TRUE, NULL);
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}
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g_list_free (cells);
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}
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}
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/* GtkCellLayout implementation */
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@ -542,6 +771,39 @@ gtk_cell_view_cell_layout_get_area (GtkCellLayout *layout)
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return cellview->priv->area;
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}
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/* GtkBuildable implementation */
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static gboolean
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gtk_cell_view_buildable_custom_tag_start (GtkBuildable *buildable,
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GtkBuilder *builder,
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GObject *child,
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const gchar *tagname,
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GMarkupParser *parser,
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gpointer *data)
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{
|
||||
if (parent_buildable_iface->custom_tag_start &&
|
||||
parent_buildable_iface->custom_tag_start (buildable, builder, child,
|
||||
tagname, parser, data))
|
||||
return TRUE;
|
||||
|
||||
return _gtk_cell_layout_buildable_custom_tag_start (buildable, builder, child,
|
||||
tagname, parser, data);
|
||||
}
|
||||
|
||||
static void
|
||||
gtk_cell_view_buildable_custom_tag_end (GtkBuildable *buildable,
|
||||
GtkBuilder *builder,
|
||||
GObject *child,
|
||||
const gchar *tagname,
|
||||
gpointer *data)
|
||||
{
|
||||
if (strcmp (tagname, "attributes") == 0 || strcmp (tagname, "cell-packing") == 0)
|
||||
_gtk_cell_layout_buildable_custom_tag_end (buildable, builder, child, tagname,
|
||||
data);
|
||||
else if (parent_buildable_iface->custom_tag_end)
|
||||
parent_buildable_iface->custom_tag_end (buildable, builder, child, tagname,
|
||||
data);
|
||||
}
|
||||
|
||||
static void
|
||||
context_size_changed_cb (GtkCellAreaContext *context,
|
||||
GParamSpec *pspec,
|
||||
@ -1062,106 +1324,64 @@ gtk_cell_view_set_background_rgba (GtkCellView *cell_view,
|
||||
gtk_widget_queue_draw (GTK_WIDGET (cell_view));
|
||||
}
|
||||
|
||||
static gboolean
|
||||
gtk_cell_view_buildable_custom_tag_start (GtkBuildable *buildable,
|
||||
GtkBuilder *builder,
|
||||
GObject *child,
|
||||
const gchar *tagname,
|
||||
GMarkupParser *parser,
|
||||
gpointer *data)
|
||||
gboolean
|
||||
gtk_cell_view_get_draw_sensitive (GtkCellView *cell_view)
|
||||
{
|
||||
if (parent_buildable_iface->custom_tag_start &&
|
||||
parent_buildable_iface->custom_tag_start (buildable, builder, child,
|
||||
tagname, parser, data))
|
||||
return TRUE;
|
||||
GtkCellViewPrivate *priv;
|
||||
|
||||
return _gtk_cell_layout_buildable_custom_tag_start (buildable, builder, child,
|
||||
tagname, parser, data);
|
||||
g_return_val_if_fail (GTK_IS_CELL_VIEW (cell_view), FALSE);
|
||||
|
||||
priv = cell_view->priv;
|
||||
|
||||
return priv->draw_sensitive;
|
||||
}
|
||||
|
||||
static void
|
||||
gtk_cell_view_buildable_custom_tag_end (GtkBuildable *buildable,
|
||||
GtkBuilder *builder,
|
||||
GObject *child,
|
||||
const gchar *tagname,
|
||||
gpointer *data)
|
||||
void
|
||||
gtk_cell_view_set_draw_sensitive (GtkCellView *cell_view,
|
||||
gboolean draw_sensitive)
|
||||
{
|
||||
if (strcmp (tagname, "attributes") == 0)
|
||||
_gtk_cell_layout_buildable_custom_tag_end (buildable, builder, child, tagname,
|
||||
data);
|
||||
else if (parent_buildable_iface->custom_tag_end)
|
||||
parent_buildable_iface->custom_tag_end (buildable, builder, child, tagname,
|
||||
data);
|
||||
GtkCellViewPrivate *priv;
|
||||
|
||||
g_return_if_fail (GTK_IS_CELL_VIEW (cell_view));
|
||||
|
||||
priv = cell_view->priv;
|
||||
|
||||
if (priv->draw_sensitive != draw_sensitive)
|
||||
{
|
||||
priv->draw_sensitive = draw_sensitive;
|
||||
|
||||
g_object_notify (G_OBJECT (cell_view), "draw-sensitive");
|
||||
}
|
||||
}
|
||||
|
||||
static void
|
||||
gtk_cell_view_get_preferred_width (GtkWidget *widget,
|
||||
gint *minimum_size,
|
||||
gint *natural_size)
|
||||
gboolean
|
||||
gtk_cell_view_get_fit_model (GtkCellView *cell_view)
|
||||
{
|
||||
GtkCellView *cellview = GTK_CELL_VIEW (widget);
|
||||
GtkCellViewPrivate *priv = cellview->priv;
|
||||
GtkCellViewPrivate *priv;
|
||||
|
||||
g_signal_handler_block (priv->context, priv->size_changed_id);
|
||||
g_return_val_if_fail (GTK_IS_CELL_VIEW (cell_view), FALSE);
|
||||
|
||||
if (cellview->priv->displayed_row)
|
||||
gtk_cell_view_set_cell_data (cellview);
|
||||
priv = cell_view->priv;
|
||||
|
||||
gtk_cell_area_get_preferred_width (priv->area, priv->context, widget, NULL, NULL);
|
||||
gtk_cell_area_context_sum_preferred_width (priv->context);
|
||||
gtk_cell_area_context_get_preferred_width (priv->context, minimum_size, natural_size);
|
||||
|
||||
g_signal_handler_unblock (priv->context, priv->size_changed_id);
|
||||
return priv->fit_model;
|
||||
}
|
||||
|
||||
static void
|
||||
gtk_cell_view_get_preferred_height (GtkWidget *widget,
|
||||
gint *minimum_size,
|
||||
gint *natural_size)
|
||||
void
|
||||
gtk_cell_view_set_fit_model (GtkCellView *cell_view,
|
||||
gboolean fit_model)
|
||||
{
|
||||
GtkCellView *cellview = GTK_CELL_VIEW (widget);
|
||||
GtkCellViewPrivate *priv = cellview->priv;
|
||||
GtkCellViewPrivate *priv;
|
||||
|
||||
g_signal_handler_block (priv->context, priv->size_changed_id);
|
||||
g_return_if_fail (GTK_IS_CELL_VIEW (cell_view));
|
||||
|
||||
if (cellview->priv->displayed_row)
|
||||
gtk_cell_view_set_cell_data (cellview);
|
||||
priv = cell_view->priv;
|
||||
|
||||
gtk_cell_area_get_preferred_height (priv->area, priv->context, widget, NULL, NULL);
|
||||
gtk_cell_area_context_sum_preferred_height (priv->context);
|
||||
gtk_cell_area_context_get_preferred_height (priv->context, minimum_size, natural_size);
|
||||
if (priv->fit_model != fit_model)
|
||||
{
|
||||
priv->fit_model = fit_model;
|
||||
|
||||
g_signal_handler_unblock (priv->context, priv->size_changed_id);
|
||||
}
|
||||
|
||||
static void
|
||||
gtk_cell_view_get_preferred_width_for_height (GtkWidget *widget,
|
||||
gint for_size,
|
||||
gint *minimum_size,
|
||||
gint *natural_size)
|
||||
{
|
||||
GtkCellView *cellview = GTK_CELL_VIEW (widget);
|
||||
GtkCellViewPrivate *priv = cellview->priv;
|
||||
|
||||
if (cellview->priv->displayed_row)
|
||||
gtk_cell_view_set_cell_data (cellview);
|
||||
|
||||
gtk_cell_area_get_preferred_width_for_height (priv->area, priv->context, widget,
|
||||
for_size, minimum_size, natural_size);
|
||||
}
|
||||
|
||||
static void
|
||||
gtk_cell_view_get_preferred_height_for_width (GtkWidget *widget,
|
||||
gint for_size,
|
||||
gint *minimum_size,
|
||||
gint *natural_size)
|
||||
{
|
||||
GtkCellView *cellview = GTK_CELL_VIEW (widget);
|
||||
GtkCellViewPrivate *priv = cellview->priv;
|
||||
|
||||
if (cellview->priv->displayed_row)
|
||||
gtk_cell_view_set_cell_data (cellview);
|
||||
|
||||
gtk_cell_area_get_preferred_height_for_width (priv->area, priv->context, widget,
|
||||
for_size, minimum_size, natural_size);
|
||||
gtk_cell_area_context_flush (cell_view->priv->context);
|
||||
|
||||
g_object_notify (G_OBJECT (cell_view), "fit-model");
|
||||
}
|
||||
}
|
||||
|
||||
@ -76,11 +76,25 @@ GtkTreeModel *gtk_cell_view_get_model (GtkCellView *cell_v
|
||||
void gtk_cell_view_set_displayed_row (GtkCellView *cell_view,
|
||||
GtkTreePath *path);
|
||||
GtkTreePath *gtk_cell_view_get_displayed_row (GtkCellView *cell_view);
|
||||
void gtk_cell_view_set_background_color (GtkCellView *cell_view,
|
||||
const GdkColor *color);
|
||||
void gtk_cell_view_set_background_rgba (GtkCellView *cell_view,
|
||||
const GdkRGBA *rgba);
|
||||
gboolean gtk_cell_view_get_draw_sensitive (GtkCellView *cell_view);
|
||||
void gtk_cell_view_set_draw_sensitive (GtkCellView *cell_view,
|
||||
gboolean draw_sensitive);
|
||||
gboolean gtk_cell_view_get_fit_model (GtkCellView *cell_view);
|
||||
void gtk_cell_view_set_fit_model (GtkCellView *cell_view,
|
||||
gboolean fit_model);
|
||||
|
||||
#ifndef GTK_DISABLE_DEPRECATED
|
||||
gboolean gtk_cell_view_get_size_of_row (GtkCellView *cell_view,
|
||||
GtkTreePath *path,
|
||||
GtkRequisition *requisition);
|
||||
#endif
|
||||
|
||||
|
||||
/* XXX These 2 are going away... */
|
||||
void gtk_cell_view_get_desired_width_of_row(GtkCellView *cell_view,
|
||||
GtkTreePath *path,
|
||||
gint *minimum_size,
|
||||
@ -91,11 +105,6 @@ void gtk_cell_view_get_desired_height_for_width_of_row(GtkCellView
|
||||
gint *minimum_size,
|
||||
gint *natural_size);
|
||||
|
||||
void gtk_cell_view_set_background_color (GtkCellView *cell_view,
|
||||
const GdkColor *color);
|
||||
void gtk_cell_view_set_background_rgba (GtkCellView *cell_view,
|
||||
const GdkRGBA *rgba);
|
||||
|
||||
G_END_DECLS
|
||||
|
||||
#endif /* __GTK_CELL_VIEW_H__ */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user