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gtk2/gtk/gtktearoffmenuitem.c

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/* GTK - The GIMP Toolkit
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GTK+ Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
*/
#include "config.h"
#include "gtkmenuprivate.h"
#include "gtkmenuitemprivate.h"
#include "gtktearoffmenuitem.h"
#include "gtkintl.h"
/**
* SECTION:gtktearoffmenuitem
* @Short_description: A menu item used to tear off and reattach its menu
* @Title: GtkTearoffMenuItem
* @See_also: #GtkMenu
*
* A #GtkTearoffMenuItem is a special #GtkMenuItem which is used to
* tear off and reattach its menu.
*
* When its menu is shown normally, the #GtkTearoffMenuItem is drawn as a
* dotted line indicating that the menu can be torn off. Activating it
* causes its menu to be torn off and displayed in its own window
* as a tearoff menu.
*
* When its menu is shown as a tearoff menu, the #GtkTearoffMenuItem is drawn
* as a dotted line which has a left pointing arrow graphic indicating that
* the tearoff menu can be reattached. Activating it will erase the tearoff
* menu window.
*/
#define ARROW_SIZE 10
#define TEAR_LENGTH 5
#define BORDER_SPACING 3
struct _GtkTearoffMenuItemPrivate
{
guint torn_off : 1;
};
static void gtk_tearoff_menu_item_get_preferred_width (GtkWidget *widget,
gint *minimum,
gint *natural);
static void gtk_tearoff_menu_item_get_preferred_height (GtkWidget *widget,
gint *minimum,
gint *natural);
static gboolean gtk_tearoff_menu_item_draw (GtkWidget *widget,
cairo_t *cr);
static void gtk_tearoff_menu_item_activate (GtkMenuItem *menu_item);
static void gtk_tearoff_menu_item_parent_set (GtkWidget *widget,
GtkWidget *previous);
G_DEFINE_TYPE (GtkTearoffMenuItem, gtk_tearoff_menu_item, GTK_TYPE_MENU_ITEM)
/**
* gtk_tearoff_menu_item_new:
*
* Creates a new #GtkTearoffMenuItem.
*
* Returns: a new #GtkTearoffMenuItem.
*/
GtkWidget*
gtk_tearoff_menu_item_new (void)
{
return g_object_new (GTK_TYPE_TEAROFF_MENU_ITEM, NULL);
}
static void
gtk_tearoff_menu_item_class_init (GtkTearoffMenuItemClass *klass)
{
GtkWidgetClass *widget_class;
GtkMenuItemClass *menu_item_class;
widget_class = (GtkWidgetClass*) klass;
menu_item_class = (GtkMenuItemClass*) klass;
widget_class->draw = gtk_tearoff_menu_item_draw;
widget_class->get_preferred_width = gtk_tearoff_menu_item_get_preferred_width;
widget_class->get_preferred_height = gtk_tearoff_menu_item_get_preferred_height;
widget_class->parent_set = gtk_tearoff_menu_item_parent_set;
gtk_widget_class_set_accessible_role (widget_class, ATK_ROLE_TEAR_OFF_MENU_ITEM);
menu_item_class->activate = gtk_tearoff_menu_item_activate;
g_type_class_add_private (klass, sizeof (GtkTearoffMenuItemPrivate));
}
static void
gtk_tearoff_menu_item_init (GtkTearoffMenuItem *tearoff_menu_item)
{
GtkTearoffMenuItemPrivate *priv;
tearoff_menu_item->priv = G_TYPE_INSTANCE_GET_PRIVATE (tearoff_menu_item,
GTK_TYPE_TEAROFF_MENU_ITEM,
GtkTearoffMenuItemPrivate);
priv = tearoff_menu_item->priv;
priv->torn_off = FALSE;
}
static void
gtk_tearoff_menu_item_get_preferred_width (GtkWidget *widget,
gint *minimum,
gint *natural)
{
GtkStyleContext *context;
guint border_width;
GtkBorder padding;
GtkStateFlags state;
context = gtk_widget_get_style_context (widget);
state = gtk_widget_get_state_flags (widget);
gtk_style_context_get_padding (context, state, &padding);
border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
*minimum = *natural = (border_width + BORDER_SPACING) * 2 + padding.left + padding.right;
}
static void
gtk_tearoff_menu_item_get_preferred_height (GtkWidget *widget,
gint *minimum,
gint *natural)
{
GtkStyleContext *context;
GtkBorder padding;
GtkStateFlags state;
GtkWidget *parent;
guint border_width;
context = gtk_widget_get_style_context (widget);
state = gtk_widget_get_state_flags (widget);
gtk_style_context_get_padding (context, state, &padding);
border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
*minimum = *natural = (border_width * 2) + padding.top + padding.bottom;
parent = gtk_widget_get_parent (widget);
if (GTK_IS_MENU (parent) && GTK_MENU (parent)->priv->torn_off)
{
*minimum += ARROW_SIZE;
*natural += ARROW_SIZE;
}
else
{
*minimum += padding.top + 4;
*natural += padding.top + 4;
}
}
static gboolean
gtk_tearoff_menu_item_draw (GtkWidget *widget,
cairo_t *cr)
{
GtkMenuItem *menu_item;
GtkStateFlags state;
GtkStyleContext *context;
GtkBorder padding;
gint x, y, width, height;
gint right_max;
guint border_width;
GtkTextDirection direction;
GtkWidget *parent;
gdouble angle;
menu_item = GTK_MENU_ITEM (widget);
context = gtk_widget_get_style_context (widget);
direction = gtk_widget_get_direction (widget);
state = gtk_widget_get_state_flags (widget);
border_width = gtk_container_get_border_width (GTK_CONTAINER (menu_item));
x = border_width;
y = border_width;
width = gtk_widget_get_allocated_width (widget) - border_width * 2;
height = gtk_widget_get_allocated_height (widget) - border_width * 2;
right_max = x + width;
gtk_style_context_save (context);
gtk_style_context_set_state (context, state);
gtk_style_context_get_padding (context, state, &padding);
if (state & GTK_STATE_FLAG_PRELIGHT)
{
gtk_render_background (context, cr, x, y, width, height);
gtk_render_frame (context, cr, x, y, width, height);
}
parent = gtk_widget_get_parent (widget);
if (GTK_IS_MENU (parent) && GTK_MENU (parent)->priv->torn_off)
{
gint arrow_x;
if (menu_item->priv->toggle_size > ARROW_SIZE)
{
if (direction == GTK_TEXT_DIR_LTR)
{
arrow_x = x + (menu_item->priv->toggle_size - ARROW_SIZE)/2;
angle = (3 * G_PI) / 2;
}
else
{
arrow_x = x + width - menu_item->priv->toggle_size + (menu_item->priv->toggle_size - ARROW_SIZE)/2;
angle = G_PI / 2;
}
x += menu_item->priv->toggle_size + BORDER_SPACING;
}
else
{
if (direction == GTK_TEXT_DIR_LTR)
{
arrow_x = ARROW_SIZE / 2;
angle = (3 * G_PI) / 2;
}
else
{
arrow_x = x + width - 2 * ARROW_SIZE + ARROW_SIZE / 2;
angle = G_PI / 2;
}
x += 2 * ARROW_SIZE;
}
gtk_render_arrow (context, cr, angle,
arrow_x, height / 2 - 5,
ARROW_SIZE);
}
while (x < right_max)
{
gint x1, x2;
if (direction == GTK_TEXT_DIR_LTR)
{
x1 = x;
x2 = MIN (x + TEAR_LENGTH, right_max);
}
else
{
x1 = right_max - x;
x2 = MAX (right_max - x - TEAR_LENGTH, 0);
}
gtk_render_line (context, cr,
x1, y + (height - padding.bottom) / 2,
x2, y + (height - padding.bottom) / 2);
x += 2 * TEAR_LENGTH;
}
gtk_style_context_restore (context);
return FALSE;
}
static void
gtk_tearoff_menu_item_activate (GtkMenuItem *menu_item)
{
GtkWidget *parent;
parent = gtk_widget_get_parent (GTK_WIDGET (menu_item));
if (GTK_IS_MENU (parent))
{
GtkMenu *menu = GTK_MENU (parent);
gtk_widget_queue_resize (GTK_WIDGET (menu_item));
gtk_menu_set_tearoff_state (GTK_MENU (parent),
!menu->priv->torn_off);
}
}
static void
tearoff_state_changed (GtkMenu *menu,
GParamSpec *pspec,
gpointer data)
{
GtkTearoffMenuItem *tearoff_menu_item = GTK_TEAROFF_MENU_ITEM (data);
GtkTearoffMenuItemPrivate *priv = tearoff_menu_item->priv;
priv->torn_off = gtk_menu_get_tearoff_state (menu);
}
static void
gtk_tearoff_menu_item_parent_set (GtkWidget *widget,
GtkWidget *previous)
{
GtkTearoffMenuItem *tearoff_menu_item = GTK_TEAROFF_MENU_ITEM (widget);
GtkTearoffMenuItemPrivate *priv = tearoff_menu_item->priv;
GtkMenu *menu;
GtkWidget *parent;
parent = gtk_widget_get_parent (widget);
menu = GTK_IS_MENU (parent) ? GTK_MENU (parent) : NULL;
if (previous)
g_signal_handlers_disconnect_by_func (previous,
tearoff_state_changed,
tearoff_menu_item);
if (menu)
{
priv->torn_off = gtk_menu_get_tearoff_state (menu);
g_signal_connect (menu, "notify::tearoff-state",
G_CALLBACK (tearoff_state_changed),
tearoff_menu_item);
}
}
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