gtk2/gtk/gtkstackswitcher.c
2019-10-12 18:12:58 +02:00

591 lines
16 KiB
C

/*
* Copyright (c) 2013 Red Hat, Inc.
*
* This program 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 program 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 program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include "config.h"
#include "gtkstackswitcher.h"
#include "gtkboxlayout.h"
#include "gtkdnd.h"
#include "gtkdragdest.h"
#include "gtkimage.h"
#include "gtkintl.h"
#include "gtklabel.h"
#include "gtkprivate.h"
#include "gtkradiobutton.h"
#include "gtkselectionmodel.h"
#include "gtkstylecontext.h"
#include "gtktypebuiltins.h"
#include "gtkwidgetprivate.h"
/**
* SECTION:gtkstackswitcher
* @Short_description: A controller for GtkStack
* @Title: GtkStackSwitcher
* @See_also: #GtkStack
*
* The GtkStackSwitcher widget acts as a controller for a
* #GtkStack; it shows a row of buttons to switch between
* the various pages of the associated stack widget.
*
* All the content for the buttons comes from the child properties
* of the #GtkStack; the button visibility in a #GtkStackSwitcher
* widget is controlled by the visibility of the child in the
* #GtkStack.
*
* It is possible to associate multiple #GtkStackSwitcher widgets
* with the same #GtkStack widget.
*
* The GtkStackSwitcher widget was added in 3.10.
*
* # CSS nodes
*
* GtkStackSwitcher has a single CSS node named stackswitcher and
* style class .stack-switcher.
*
* When circumstances require it, GtkStackSwitcher adds the
* .needs-attention style class to the widgets representing the
* stack pages.
*/
#define TIMEOUT_EXPAND 500
typedef struct _GtkStackSwitcherClass GtkStackSwitcherClass;
typedef struct _GtkStackSwitcherPrivate GtkStackSwitcherPrivate;
struct _GtkStackSwitcher
{
GtkWidget parent_instance;
};
struct _GtkStackSwitcherClass
{
GtkWidgetClass parent_class;
};
struct _GtkStackSwitcherPrivate
{
GtkStack *stack;
GtkSelectionModel *pages;
GHashTable *buttons;
GtkWidget *switch_button;
guint switch_timer;
};
enum {
PROP_0,
PROP_STACK
};
G_DEFINE_TYPE_WITH_PRIVATE (GtkStackSwitcher, gtk_stack_switcher, GTK_TYPE_WIDGET)
static void
gtk_stack_switcher_init (GtkStackSwitcher *switcher)
{
GtkStackSwitcherPrivate *priv = gtk_stack_switcher_get_instance_private (switcher);
GtkStyleContext *context;
priv->buttons = g_hash_table_new_full (g_direct_hash, g_direct_equal, g_object_unref, NULL);
context = gtk_widget_get_style_context (GTK_WIDGET (switcher));
gtk_style_context_add_class (context, GTK_STYLE_CLASS_LINKED);
gtk_drag_dest_set (GTK_WIDGET (switcher), 0, NULL, 0);
gtk_drag_dest_set_track_motion (GTK_WIDGET (switcher), TRUE);
}
static void
on_button_toggled (GtkWidget *button,
GParamSpec *pspec,
GtkStackSwitcher *self)
{
GtkStackSwitcherPrivate *priv = gtk_stack_switcher_get_instance_private (self);
gboolean active;
guint index;
active = gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (button));
index = GPOINTER_TO_UINT (g_object_get_data (G_OBJECT (button), "child-index"));
if (active)
{
gtk_selection_model_select_item (priv->pages, index, TRUE);
}
else
{
gboolean selected = gtk_selection_model_is_selected (priv->pages, index);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (button), selected);
}
}
static void
rebuild_child (GtkWidget *self,
const gchar *icon_name,
const gchar *title)
{
GtkStyleContext *context;
GtkWidget *button_child;
button_child = gtk_bin_get_child (GTK_BIN (self));
if (button_child != NULL)
gtk_widget_destroy (button_child);
button_child = NULL;
context = gtk_widget_get_style_context (GTK_WIDGET (self));
if (icon_name != NULL)
{
button_child = gtk_image_new_from_icon_name (icon_name);
if (title != NULL)
gtk_widget_set_tooltip_text (GTK_WIDGET (self), title);
gtk_style_context_remove_class (context, "text-button");
gtk_style_context_add_class (context, "image-button");
}
else if (title != NULL)
{
button_child = gtk_label_new (title);
gtk_widget_set_tooltip_text (GTK_WIDGET (self), NULL);
gtk_style_context_remove_class (context, "image-button");
gtk_style_context_add_class (context, "text-button");
}
if (button_child)
{
gtk_widget_set_halign (GTK_WIDGET (button_child), GTK_ALIGN_CENTER);
gtk_container_add (GTK_CONTAINER (self), button_child);
}
}
static void
update_button (GtkStackSwitcher *self,
GtkStackPage *page,
GtkWidget *button)
{
gchar *title;
gchar *icon_name;
gboolean needs_attention;
gboolean visible;
GtkStyleContext *context;
g_object_get (page,
"title", &title,
"icon-name", &icon_name,
"needs-attention", &needs_attention,
"visible", &visible,
NULL);
rebuild_child (button, icon_name, title);
gtk_widget_set_visible (button, visible && (title != NULL || icon_name != NULL));
context = gtk_widget_get_style_context (button);
if (needs_attention)
gtk_style_context_add_class (context, GTK_STYLE_CLASS_NEEDS_ATTENTION);
else
gtk_style_context_remove_class (context, GTK_STYLE_CLASS_NEEDS_ATTENTION);
g_free (title);
g_free (icon_name);
}
static void
on_page_updated (GtkStackPage *page,
GParamSpec *pspec,
GtkStackSwitcher *self)
{
GtkStackSwitcherPrivate *priv = gtk_stack_switcher_get_instance_private (self);
GtkWidget *button;
button = g_hash_table_lookup (priv->buttons, page);
update_button (self, page, button);
}
static void
remove_switch_timer (GtkStackSwitcher *self)
{
GtkStackSwitcherPrivate *priv = gtk_stack_switcher_get_instance_private (self);
if (priv->switch_timer)
{
g_source_remove (priv->switch_timer);
priv->switch_timer = 0;
}
}
static gboolean
gtk_stack_switcher_switch_timeout (gpointer data)
{
GtkStackSwitcher *self = data;
GtkStackSwitcherPrivate *priv = gtk_stack_switcher_get_instance_private (self);
GtkWidget *button;
priv->switch_timer = 0;
button = priv->switch_button;
priv->switch_button = NULL;
if (button)
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (button), TRUE);
return G_SOURCE_REMOVE;
}
static gboolean
gtk_stack_switcher_drag_motion (GtkWidget *widget,
GdkDrop *drop,
gint x,
gint y)
{
GtkStackSwitcher *self = GTK_STACK_SWITCHER (widget);
GtkStackSwitcherPrivate *priv = gtk_stack_switcher_get_instance_private (self);
GtkWidget *button;
GHashTableIter iter;
gpointer value;
gboolean retval = FALSE;
button = NULL;
g_hash_table_iter_init (&iter, priv->buttons);
while (g_hash_table_iter_next (&iter, NULL, &value))
{
if (gtk_widget_contains (GTK_WIDGET (value), x, y))
{
button = GTK_WIDGET (value);
retval = TRUE;
break;
}
}
if (button != priv->switch_button)
remove_switch_timer (self);
priv->switch_button = button;
if (button && !priv->switch_timer)
{
priv->switch_timer = g_timeout_add (TIMEOUT_EXPAND,
gtk_stack_switcher_switch_timeout,
self);
g_source_set_name_by_id (priv->switch_timer, "[gtk] gtk_stack_switcher_switch_timeout");
}
return retval;
}
static void
gtk_stack_switcher_drag_leave (GtkWidget *widget,
GdkDrop *drop)
{
GtkStackSwitcher *self = GTK_STACK_SWITCHER (widget);
remove_switch_timer (self);
}
static void
add_child (guint position,
GtkStackSwitcher *self)
{
GtkStackSwitcherPrivate *priv = gtk_stack_switcher_get_instance_private (self);
GtkWidget *button;
gboolean selected;
GtkStackPage *page;
button = gtk_toggle_button_new ();
gtk_widget_set_focus_on_click (button, FALSE);
page = g_list_model_get_item (G_LIST_MODEL (priv->pages), position);
update_button (self, page, button);
gtk_widget_set_parent (button, GTK_WIDGET (self));
g_object_set_data (G_OBJECT (button), "child-index", GUINT_TO_POINTER (position));
selected = gtk_selection_model_is_selected (priv->pages, position);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (button), selected);
g_signal_connect (button, "notify::active", G_CALLBACK (on_button_toggled), self);
g_signal_connect (page, "notify", G_CALLBACK (on_page_updated), self);
g_hash_table_insert (priv->buttons, g_object_ref (page), button);
g_object_unref (page);
}
static void
populate_switcher (GtkStackSwitcher *self)
{
GtkStackSwitcherPrivate *priv = gtk_stack_switcher_get_instance_private (self);
guint i;
for (i = 0; i < g_list_model_get_n_items (G_LIST_MODEL (priv->pages)); i++)
add_child (i, self);
}
static void
clear_switcher (GtkStackSwitcher *self)
{
GtkStackSwitcherPrivate *priv = gtk_stack_switcher_get_instance_private (self);
GHashTableIter iter;
GtkWidget *page;
GtkWidget *button;
g_hash_table_iter_init (&iter, priv->buttons);
while (g_hash_table_iter_next (&iter, (gpointer *)&page, (gpointer *)&button))
{
gtk_widget_unparent (button);
g_signal_handlers_disconnect_by_func (page, on_page_updated, self);
g_hash_table_iter_remove (&iter);
}
}
static void
items_changed_cb (GListModel *model,
guint position,
guint removed,
guint added,
GtkStackSwitcher *switcher)
{
clear_switcher (switcher);
populate_switcher (switcher);
}
static void
selection_changed_cb (GtkSelectionModel *model,
guint position,
guint n_items,
GtkStackSwitcher *switcher)
{
GtkStackSwitcherPrivate *priv = gtk_stack_switcher_get_instance_private (switcher);
guint i;
for (i = position; i < position + n_items; i++)
{
GtkStackPage *page;
GtkWidget *button;
gboolean selected;
page = g_list_model_get_item (G_LIST_MODEL (priv->pages), i);
button = g_hash_table_lookup (priv->buttons, page);
if (button)
{
selected = gtk_selection_model_is_selected (priv->pages, i);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (button), selected);
}
g_object_unref (page);
}
}
static void
disconnect_stack_signals (GtkStackSwitcher *switcher)
{
GtkStackSwitcherPrivate *priv = gtk_stack_switcher_get_instance_private (switcher);
g_signal_handlers_disconnect_by_func (priv->pages, items_changed_cb, switcher);
g_signal_handlers_disconnect_by_func (priv->pages, selection_changed_cb, switcher);
}
static void
connect_stack_signals (GtkStackSwitcher *switcher)
{
GtkStackSwitcherPrivate *priv = gtk_stack_switcher_get_instance_private (switcher);
g_signal_connect (priv->pages, "items-changed", G_CALLBACK (items_changed_cb), switcher);
g_signal_connect (priv->pages, "selection-changed", G_CALLBACK (selection_changed_cb), switcher);
}
static void
set_stack (GtkStackSwitcher *switcher,
GtkStack *stack)
{
GtkStackSwitcherPrivate *priv = gtk_stack_switcher_get_instance_private (switcher);
if (stack)
{
priv->stack = g_object_ref (stack);
priv->pages = gtk_stack_get_pages (stack);
populate_switcher (switcher);
connect_stack_signals (switcher);
}
}
static void
unset_stack (GtkStackSwitcher *switcher)
{
GtkStackSwitcherPrivate *priv = gtk_stack_switcher_get_instance_private (switcher);
if (priv->stack)
{
disconnect_stack_signals (switcher);
clear_switcher (switcher);
g_clear_object (&priv->stack);
g_clear_object (&priv->pages);
}
}
/**
* gtk_stack_switcher_set_stack:
* @switcher: a #GtkStackSwitcher
* @stack: (allow-none): a #GtkStack
*
* Sets the stack to control.
*/
void
gtk_stack_switcher_set_stack (GtkStackSwitcher *switcher,
GtkStack *stack)
{
GtkStackSwitcherPrivate *priv = gtk_stack_switcher_get_instance_private (switcher);
g_return_if_fail (GTK_IS_STACK_SWITCHER (switcher));
g_return_if_fail (GTK_IS_STACK (stack) || stack == NULL);
if (priv->stack == stack)
return;
unset_stack (switcher);
set_stack (switcher, stack);
gtk_widget_queue_resize (GTK_WIDGET (switcher));
g_object_notify (G_OBJECT (switcher), "stack");
}
/**
* gtk_stack_switcher_get_stack:
* @switcher: a #GtkStackSwitcher
*
* Retrieves the stack.
* See gtk_stack_switcher_set_stack().
*
* Returns: (nullable) (transfer none): the stack, or %NULL if
* none has been set explicitly.
*/
GtkStack *
gtk_stack_switcher_get_stack (GtkStackSwitcher *switcher)
{
GtkStackSwitcherPrivate *priv;
g_return_val_if_fail (GTK_IS_STACK_SWITCHER (switcher), NULL);
priv = gtk_stack_switcher_get_instance_private (switcher);
return priv->stack;
}
static void
gtk_stack_switcher_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GtkStackSwitcher *switcher = GTK_STACK_SWITCHER (object);
GtkStackSwitcherPrivate *priv;
priv = gtk_stack_switcher_get_instance_private (switcher);
switch (prop_id)
{
case PROP_STACK:
g_value_set_object (value, priv->stack);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gtk_stack_switcher_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GtkStackSwitcher *switcher = GTK_STACK_SWITCHER (object);
switch (prop_id)
{
case PROP_STACK:
gtk_stack_switcher_set_stack (switcher, g_value_get_object (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gtk_stack_switcher_dispose (GObject *object)
{
GtkStackSwitcher *switcher = GTK_STACK_SWITCHER (object);
remove_switch_timer (switcher);
unset_stack (switcher);
G_OBJECT_CLASS (gtk_stack_switcher_parent_class)->dispose (object);
}
static void
gtk_stack_switcher_finalize (GObject *object)
{
GtkStackSwitcher *switcher = GTK_STACK_SWITCHER (object);
GtkStackSwitcherPrivate *priv = gtk_stack_switcher_get_instance_private (switcher);
g_hash_table_destroy (priv->buttons);
G_OBJECT_CLASS (gtk_stack_switcher_parent_class)->finalize (object);
}
static void
gtk_stack_switcher_class_init (GtkStackSwitcherClass *class)
{
GObjectClass *object_class = G_OBJECT_CLASS (class);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
object_class->get_property = gtk_stack_switcher_get_property;
object_class->set_property = gtk_stack_switcher_set_property;
object_class->dispose = gtk_stack_switcher_dispose;
object_class->finalize = gtk_stack_switcher_finalize;
widget_class->drag_motion = gtk_stack_switcher_drag_motion;
widget_class->drag_leave = gtk_stack_switcher_drag_leave;
g_object_class_install_property (object_class,
PROP_STACK,
g_param_spec_object ("stack",
P_("Stack"),
P_("Stack"),
GTK_TYPE_STACK,
GTK_PARAM_READWRITE |
G_PARAM_CONSTRUCT));
gtk_widget_class_set_layout_manager_type (widget_class, GTK_TYPE_BOX_LAYOUT);
gtk_widget_class_set_css_name (widget_class, I_("stackswitcher"));
}
/**
* gtk_stack_switcher_new:
*
* Create a new #GtkStackSwitcher.
*
* Returns: a new #GtkStackSwitcher.
*/
GtkWidget *
gtk_stack_switcher_new (void)
{
return g_object_new (GTK_TYPE_STACK_SWITCHER, NULL);
}