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gtk2/gtk/gtkswitch.c
Timm Bäder 9992a616ef widget: Use ::measure vfunc to measure size 
Add a new ::measure vfunc similar to GtkCssGadget's that widget
implementations have to override instead of the old get_preferred_width,
get_preferred_height, get_preferred_width_for_height,
get_preferred_height_for_width and
get_preferred_height_and_baseline_for_width.
2016-10-22 19:05:47 +02:00

1048 lines
31 KiB
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/* GTK - The GIMP Toolkit
*
* Copyright (C) 2010 Intel Corporation
* Copyright (C) 2010 RedHat, Inc.
*
* 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, see <http://www.gnu.org/licenses/>.
*
* Author:
* Emmanuele Bassi <ebassi@linux.intel.com>
* Matthias Clasen <mclasen@redhat.com>
*
* Based on similar code from Mx.
*/
/**
* SECTION:gtkswitch
* @Short_Description: A “light switch” style toggle
* @Title: GtkSwitch
* @See_Also: #GtkToggleButton
*
* #GtkSwitch is a widget that has two states: on or off. The user can control
* which state should be active by clicking the empty area, or by dragging the
* handle.
*
* GtkSwitch can also handle situations where the underlying state changes with
* a delay. See #GtkSwitch::state-set for details.
*
* # CSS nodes
*
* |[<!-- language="plain" -->
* switch
* ╰── slider
* ]|
*
* GtkSwitch has two css nodes, the main node with the name switch and a subnode
* named slider. Neither of them is using any style classes.
*/
#include "config.h"
#include "gtkswitch.h"
#include "gtkintl.h"
#include "gtkprivate.h"
#include "gtkwidget.h"
#include "gtkmarshalers.h"
#include "gtkapplicationprivate.h"
#include "gtkactionable.h"
#include "a11y/gtkswitchaccessible.h"
#include "gtkactionhelper.h"
#include "gtkcsscustomgadgetprivate.h"
#include "gtkcssgadgetprivate.h"
#include "gtkstylecontextprivate.h"
#include "gtkwidgetprivate.h"
#include "gtkcssshadowsvalueprivate.h"
#include "gtkcssnumbervalueprivate.h"
#include "gtkprogresstrackerprivate.h"
#include "gtksettingsprivate.h"
#include "fallback-c89.c"
struct _GtkSwitchPrivate
{
GdkWindow *event_window;
GtkActionHelper *action_helper;
GtkGesture *pan_gesture;
GtkGesture *multipress_gesture;
GtkCssGadget *gadget;
GtkCssGadget *slider_gadget;
PangoLayout *off_layout;
PangoLayout *on_layout;
double handle_pos;
guint tick_id;
GtkProgressTracker tracker;
guint state : 1;
guint is_active : 1;
guint in_switch : 1;
};
enum
{
PROP_0,
PROP_ACTIVE,
PROP_STATE,
LAST_PROP,
PROP_ACTION_NAME,
PROP_ACTION_TARGET
};
enum
{
ACTIVATE,
STATE_SET,
LAST_SIGNAL
};
static guint signals[LAST_SIGNAL] = { 0 };
static GParamSpec *switch_props[LAST_PROP] = { NULL, };
static void gtk_switch_actionable_iface_init (GtkActionableInterface *iface);
G_DEFINE_TYPE_WITH_CODE (GtkSwitch, gtk_switch, GTK_TYPE_WIDGET,
G_ADD_PRIVATE (GtkSwitch)
G_IMPLEMENT_INTERFACE (GTK_TYPE_ACTIONABLE,
gtk_switch_actionable_iface_init))
static void
gtk_switch_end_toggle_animation (GtkSwitch *sw)
{
GtkSwitchPrivate *priv = sw->priv;
if (priv->tick_id != 0)
{
gtk_widget_remove_tick_callback (GTK_WIDGET (sw), priv->tick_id);
priv->tick_id = 0;
}
}
static gboolean
gtk_switch_on_frame_clock_update (GtkWidget *widget,
GdkFrameClock *clock,
gpointer user_data)
{
GtkSwitch *sw = GTK_SWITCH (widget);
GtkSwitchPrivate *priv = sw->priv;
gtk_progress_tracker_advance_frame (&priv->tracker,
gdk_frame_clock_get_frame_time (clock));
if (gtk_progress_tracker_get_state (&priv->tracker) != GTK_PROGRESS_STATE_AFTER)
{
if (priv->is_active)
priv->handle_pos = 1.0 - gtk_progress_tracker_get_ease_out_cubic (&priv->tracker, FALSE);
else
priv->handle_pos = gtk_progress_tracker_get_ease_out_cubic (&priv->tracker, FALSE);
}
else
{
gtk_switch_set_active (sw, !priv->is_active);
}
gtk_widget_queue_allocate (GTK_WIDGET (sw));
return G_SOURCE_CONTINUE;
}
#define ANIMATION_DURATION 100
static void
gtk_switch_begin_toggle_animation (GtkSwitch *sw)
{
GtkSwitchPrivate *priv = sw->priv;
if (gtk_settings_get_enable_animations (gtk_widget_get_settings (GTK_WIDGET (sw))))
{
gtk_progress_tracker_start (&priv->tracker, 1000 * ANIMATION_DURATION, 0, 1.0);
if (priv->tick_id == 0)
priv->tick_id = gtk_widget_add_tick_callback (GTK_WIDGET (sw),
gtk_switch_on_frame_clock_update,
NULL, NULL);
}
else
{
gtk_switch_set_active (sw, !priv->is_active);
}
}
static void
gtk_switch_multipress_gesture_pressed (GtkGestureMultiPress *gesture,
gint n_press,
gdouble x,
gdouble y,
GtkSwitch *sw)
{
GtkSwitchPrivate *priv = sw->priv;
GtkAllocation allocation;
gtk_widget_get_allocation (GTK_WIDGET (sw), &allocation);
gtk_gesture_set_state (GTK_GESTURE (gesture), GTK_EVENT_SEQUENCE_CLAIMED);
/* If the press didn't happen in the draggable handle,
* cancel the pan gesture right away
*/
if ((priv->is_active && x <= allocation.width / 2) ||
(!priv->is_active && x > allocation.width / 2))
gtk_gesture_set_state (priv->pan_gesture, GTK_EVENT_SEQUENCE_DENIED);
}
static void
gtk_switch_multipress_gesture_released (GtkGestureMultiPress *gesture,
gint n_press,
gdouble x,
gdouble y,
GtkSwitch *sw)
{
GtkSwitchPrivate *priv = sw->priv;
GdkEventSequence *sequence;
sequence = gtk_gesture_single_get_current_sequence (GTK_GESTURE_SINGLE (gesture));
if (priv->in_switch &&
gtk_gesture_handles_sequence (GTK_GESTURE (gesture), sequence))
gtk_switch_begin_toggle_animation (sw);
}
static void
gtk_switch_pan_gesture_pan (GtkGesturePan *gesture,
GtkPanDirection direction,
gdouble offset,
GtkSwitch *sw)
{
GtkWidget *widget = GTK_WIDGET (sw);
GtkSwitchPrivate *priv = sw->priv;
gint width;
if (direction == GTK_PAN_DIRECTION_LEFT)
offset = -offset;
gtk_gesture_set_state (GTK_GESTURE (gesture), GTK_EVENT_SEQUENCE_CLAIMED);
width = gtk_widget_get_allocated_width (widget);
if (priv->is_active)
offset += width / 2;
offset /= width / 2;
/* constrain the handle within the trough width */
priv->handle_pos = CLAMP (offset, 0, 1.0);
/* we need to redraw the handle */
gtk_widget_queue_allocate (widget);
}
static void
gtk_switch_pan_gesture_drag_end (GtkGestureDrag *gesture,
gdouble x,
gdouble y,
GtkSwitch *sw)
{
GtkSwitchPrivate *priv = sw->priv;
GdkEventSequence *sequence;
GtkAllocation allocation;
gboolean active;
sequence = gtk_gesture_single_get_current_sequence (GTK_GESTURE_SINGLE (gesture));
if (gtk_gesture_get_sequence_state (GTK_GESTURE (gesture), sequence) == GTK_EVENT_SEQUENCE_CLAIMED)
{
gtk_widget_get_allocation (GTK_WIDGET (sw), &allocation);
/* if half the handle passed the middle of the switch, then we
* consider it to be on
*/
active = priv->handle_pos >= 0.5;
}
else if (!gtk_gesture_handles_sequence (priv->multipress_gesture, sequence))
active = priv->is_active;
else
return;
priv->handle_pos = active ? 1.0 : 0.0;
gtk_switch_set_active (sw, active);
gtk_widget_queue_allocate (GTK_WIDGET (sw));
}
static void
gtk_switch_create_pango_layouts (GtkSwitch *self)
{
GtkSwitchPrivate *priv = self->priv;
g_clear_object (&priv->on_layout);
/* Translators: if the "on" state label requires more than three
* glyphs then use MEDIUM VERTICAL BAR (U+2759) as the text for
* the state
*/
priv->on_layout = gtk_widget_create_pango_layout (GTK_WIDGET (self), C_("switch", "ON"));
g_clear_object (&priv->off_layout);
/* Translators: if the "off" state label requires more than three
* glyphs then use WHITE CIRCLE (U+25CB) as the text for the state
*/
priv->off_layout = gtk_widget_create_pango_layout (GTK_WIDGET (self), C_("switch", "OFF"));
}
static void
gtk_switch_screen_changed (GtkWidget *widget,
GdkScreen *prev_screen)
{
gtk_switch_create_pango_layouts (GTK_SWITCH (widget));
}
static void
gtk_switch_style_updated (GtkWidget *widget)
{
GtkSwitch *self = GTK_SWITCH (widget);
GtkStyleContext *context;
GtkCssStyleChange *change;
GTK_WIDGET_CLASS (gtk_switch_parent_class)->style_updated (widget);
context = gtk_widget_get_style_context (widget);
change = gtk_style_context_get_change (context);
if (change == NULL || gtk_css_style_change_affects (change, GTK_CSS_AFFECTS_FONT))
gtk_switch_create_pango_layouts (self);
}
static gboolean
gtk_switch_enter (GtkWidget *widget,
GdkEventCrossing *event)
{
GtkSwitchPrivate *priv = GTK_SWITCH (widget)->priv;
if (event->window == priv->event_window)
{
priv->in_switch = TRUE;
gtk_widget_set_state_flags (widget, GTK_STATE_FLAG_PRELIGHT, FALSE);
}
return FALSE;
}
static gboolean
gtk_switch_leave (GtkWidget *widget,
GdkEventCrossing *event)
{
GtkSwitchPrivate *priv = GTK_SWITCH (widget)->priv;
if (event->window == priv->event_window)
{
priv->in_switch = FALSE;
gtk_widget_unset_state_flags (widget, GTK_STATE_FLAG_PRELIGHT);
}
return FALSE;
}
static void
gtk_switch_activate (GtkSwitch *sw)
{
gtk_switch_begin_toggle_animation (sw);
}
static void
gtk_switch_get_content_size (GtkCssGadget *gadget,
GtkOrientation orientation,
gint for_size,
gint *minimum,
gint *natural,
gint *minimum_baseline,
gint *natural_baseline,
gpointer unused)
{
GtkWidget *widget;
GtkSwitch *self;
GtkSwitchPrivate *priv;
gint slider_minimum, slider_natural;
PangoRectangle on_rect, off_rect;
widget = gtk_css_gadget_get_owner (gadget);
self = GTK_SWITCH (widget);
priv = self->priv;
gtk_css_gadget_get_preferred_size (priv->slider_gadget,
orientation,
-1,
&slider_minimum, &slider_natural,
NULL, NULL);
pango_layout_get_pixel_extents (priv->on_layout, NULL, &on_rect);
pango_layout_get_pixel_extents (priv->off_layout, NULL, &off_rect);
if (orientation == GTK_ORIENTATION_HORIZONTAL)
{
int text_width = MAX (on_rect.width, off_rect.width);
*minimum = 2 * MAX (slider_minimum, text_width);
*natural = 2 * MAX (slider_natural, text_width);
}
else
{
int text_height = MAX (on_rect.height, off_rect.height);
*minimum = MAX (slider_minimum, text_height);
*natural = MAX (slider_natural, text_height);
}
}
static void
gtk_switch_measure (GtkWidget *widget,
GtkOrientation orientation,
int for_size,
int *minimum,
int *natural,
int *minimum_baseline,
int *natural_baseline)
{
gtk_css_gadget_get_preferred_size (GTK_SWITCH (widget)->priv->gadget,
orientation,
for_size,
minimum, natural,
minimum_baseline, natural_baseline);
}
static void
gtk_switch_allocate_contents (GtkCssGadget *gadget,
const GtkAllocation *allocation,
int baseline,
GtkAllocation *out_clip,
gpointer unused)
{
GtkSwitch *self = GTK_SWITCH (gtk_css_gadget_get_owner (gadget));
GtkSwitchPrivate *priv = self->priv;
GtkAllocation slider_alloc;
slider_alloc.x = allocation->x + round (priv->handle_pos * (allocation->width - allocation->width / 2));
slider_alloc.y = allocation->y;
slider_alloc.width = allocation->width / 2;
slider_alloc.height = allocation->height;
gtk_css_gadget_allocate (priv->slider_gadget,
&slider_alloc,
baseline,
out_clip);
if (gtk_widget_get_realized (GTK_WIDGET (self)))
{
GtkAllocation border_allocation;
gtk_css_gadget_get_border_allocation (gadget, &border_allocation, NULL);
gdk_window_move_resize (priv->event_window,
border_allocation.x,
border_allocation.y,
border_allocation.width,
border_allocation.height);
}
}
static void
gtk_switch_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GtkSwitchPrivate *priv = GTK_SWITCH (widget)->priv;
GtkAllocation clip;
gtk_widget_set_allocation (widget, allocation);
gtk_css_gadget_allocate (priv->gadget,
allocation,
gtk_widget_get_allocated_baseline (widget),
&clip);
gtk_widget_set_clip (widget, &clip);
}
static void
gtk_switch_realize (GtkWidget *widget)
{
GtkSwitchPrivate *priv = GTK_SWITCH (widget)->priv;
GdkWindow *parent_window;
GtkAllocation allocation;
gtk_widget_set_realized (widget, TRUE);
parent_window = gtk_widget_get_parent_window (widget);
gtk_widget_set_window (widget, parent_window);
g_object_ref (parent_window);
gtk_widget_get_allocation (widget, &allocation);
priv->event_window = gdk_window_new_input (parent_window,
gtk_widget_get_events (widget)
| GDK_BUTTON_PRESS_MASK
| GDK_BUTTON_RELEASE_MASK
| GDK_BUTTON1_MOTION_MASK
| GDK_POINTER_MOTION_MASK
| GDK_ENTER_NOTIFY_MASK
| GDK_LEAVE_NOTIFY_MASK,
&allocation);
gtk_widget_register_window (widget, priv->event_window);
}
static void
gtk_switch_unrealize (GtkWidget *widget)
{
GtkSwitchPrivate *priv = GTK_SWITCH (widget)->priv;
if (priv->event_window != NULL)
{
gtk_widget_unregister_window (widget, priv->event_window);
gdk_window_destroy (priv->event_window);
priv->event_window = NULL;
}
GTK_WIDGET_CLASS (gtk_switch_parent_class)->unrealize (widget);
}
static void
gtk_switch_map (GtkWidget *widget)
{
GtkSwitchPrivate *priv = GTK_SWITCH (widget)->priv;
GTK_WIDGET_CLASS (gtk_switch_parent_class)->map (widget);
if (priv->event_window)
gdk_window_show (priv->event_window);
}
static void
gtk_switch_unmap (GtkWidget *widget)
{
GtkSwitchPrivate *priv = GTK_SWITCH (widget)->priv;
if (priv->event_window)
gdk_window_hide (priv->event_window);
GTK_WIDGET_CLASS (gtk_switch_parent_class)->unmap (widget);
}
static gboolean
gtk_switch_render_slider (GtkCssGadget *gadget,
cairo_t *cr,
int x,
int y,
int width,
int height,
gpointer data)
{
return gtk_widget_has_visible_focus (gtk_css_gadget_get_owner (gadget));
}
static gboolean
gtk_switch_render_trough (GtkCssGadget *gadget,
cairo_t *cr,
int x,
int y,
int width,
int height,
gpointer data)
{
GtkWidget *widget = gtk_css_gadget_get_owner (gadget);
GtkSwitchPrivate *priv = GTK_SWITCH (widget)->priv;
GtkStyleContext *context = gtk_widget_get_style_context (widget);
PangoRectangle rect;
gint label_x, label_y;
pango_layout_get_pixel_extents (priv->on_layout, NULL, &rect);
label_x = x + ((width / 2) - rect.width) / 2;
label_y = y + (height - rect.height) / 2;
gtk_render_layout (context, cr, label_x, label_y, priv->on_layout);
pango_layout_get_pixel_extents (priv->off_layout, NULL, &rect);
label_x = x + (width / 2) + ((width / 2) - rect.width) / 2;
label_y = y + (height - rect.height) / 2;
gtk_render_layout (context, cr, label_x, label_y, priv->off_layout);
gtk_css_gadget_draw (priv->slider_gadget, cr);
return FALSE;
}
static gboolean
gtk_switch_draw (GtkWidget *widget,
cairo_t *cr)
{
gtk_css_gadget_draw (GTK_SWITCH (widget)->priv->gadget, cr);
return FALSE;
}
static void
gtk_switch_set_action_name (GtkActionable *actionable,
const gchar *action_name)
{
GtkSwitch *sw = GTK_SWITCH (actionable);
if (!sw->priv->action_helper)
sw->priv->action_helper = gtk_action_helper_new (actionable);
gtk_action_helper_set_action_name (sw->priv->action_helper, action_name);
}
static void
gtk_switch_set_action_target_value (GtkActionable *actionable,
GVariant *action_target)
{
GtkSwitch *sw = GTK_SWITCH (actionable);
if (!sw->priv->action_helper)
sw->priv->action_helper = gtk_action_helper_new (actionable);
gtk_action_helper_set_action_target_value (sw->priv->action_helper, action_target);
}
static const gchar *
gtk_switch_get_action_name (GtkActionable *actionable)
{
GtkSwitch *sw = GTK_SWITCH (actionable);
return gtk_action_helper_get_action_name (sw->priv->action_helper);
}
static GVariant *
gtk_switch_get_action_target_value (GtkActionable *actionable)
{
GtkSwitch *sw = GTK_SWITCH (actionable);
return gtk_action_helper_get_action_target_value (sw->priv->action_helper);
}
static void
gtk_switch_actionable_iface_init (GtkActionableInterface *iface)
{
iface->get_action_name = gtk_switch_get_action_name;
iface->set_action_name = gtk_switch_set_action_name;
iface->get_action_target_value = gtk_switch_get_action_target_value;
iface->set_action_target_value = gtk_switch_set_action_target_value;
}
static void
gtk_switch_set_property (GObject *gobject,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GtkSwitch *sw = GTK_SWITCH (gobject);
switch (prop_id)
{
case PROP_ACTIVE:
gtk_switch_set_active (sw, g_value_get_boolean (value));
break;
case PROP_STATE:
gtk_switch_set_state (sw, g_value_get_boolean (value));
break;
case PROP_ACTION_NAME:
gtk_switch_set_action_name (GTK_ACTIONABLE (sw), g_value_get_string (value));
break;
case PROP_ACTION_TARGET:
gtk_switch_set_action_target_value (GTK_ACTIONABLE (sw), g_value_get_variant (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
}
}
static void
gtk_switch_get_property (GObject *gobject,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GtkSwitchPrivate *priv = GTK_SWITCH (gobject)->priv;
switch (prop_id)
{
case PROP_ACTIVE:
g_value_set_boolean (value, priv->is_active);
break;
case PROP_STATE:
g_value_set_boolean (value, priv->state);
break;
case PROP_ACTION_NAME:
g_value_set_string (value, gtk_action_helper_get_action_name (priv->action_helper));
break;
case PROP_ACTION_TARGET:
g_value_set_variant (value, gtk_action_helper_get_action_target_value (priv->action_helper));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
}
}
static void
gtk_switch_dispose (GObject *object)
{
GtkSwitchPrivate *priv = GTK_SWITCH (object)->priv;
g_clear_object (&priv->action_helper);
g_clear_object (&priv->gadget);
g_clear_object (&priv->slider_gadget);
g_clear_object (&priv->pan_gesture);
g_clear_object (&priv->multipress_gesture);
g_clear_object (&priv->on_layout);
g_clear_object (&priv->off_layout);
G_OBJECT_CLASS (gtk_switch_parent_class)->dispose (object);
}
static void
gtk_switch_finalize (GObject *object)
{
gtk_switch_end_toggle_animation (GTK_SWITCH (object));
G_OBJECT_CLASS (gtk_switch_parent_class)->finalize (object);
}
static gboolean
state_set (GtkSwitch *sw, gboolean state)
{
if (sw->priv->action_helper)
gtk_action_helper_activate (sw->priv->action_helper);
gtk_switch_set_state (sw, state);
return TRUE;
}
static void
gtk_switch_class_init (GtkSwitchClass *klass)
{
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
/**
* GtkSwitch:active:
*
* Whether the #GtkSwitch widget is in its on or off state.
*/
switch_props[PROP_ACTIVE] =
g_param_spec_boolean ("active",
P_("Active"),
P_("Whether the switch is on or off"),
FALSE,
GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
/**
* GtkSwitch:state:
*
* The backend state that is controlled by the switch.
* See #GtkSwitch::state-set for details.
*
* Since: 3.14
*/
switch_props[PROP_STATE] =
g_param_spec_boolean ("state",
P_("State"),
P_("The backend state"),
FALSE,
GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
gobject_class->set_property = gtk_switch_set_property;
gobject_class->get_property = gtk_switch_get_property;
gobject_class->dispose = gtk_switch_dispose;
gobject_class->finalize = gtk_switch_finalize;
g_object_class_install_properties (gobject_class, LAST_PROP, switch_props);
widget_class->measure = gtk_switch_measure;
widget_class->size_allocate = gtk_switch_size_allocate;
widget_class->realize = gtk_switch_realize;
widget_class->unrealize = gtk_switch_unrealize;
widget_class->map = gtk_switch_map;
widget_class->unmap = gtk_switch_unmap;
widget_class->draw = gtk_switch_draw;
widget_class->enter_notify_event = gtk_switch_enter;
widget_class->leave_notify_event = gtk_switch_leave;
widget_class->screen_changed = gtk_switch_screen_changed;
widget_class->style_updated = gtk_switch_style_updated;
klass->activate = gtk_switch_activate;
klass->state_set = state_set;
/**
* GtkSwitch::activate:
* @widget: the object which received the signal.
*
* The ::activate signal on GtkSwitch is an action signal and
* emitting it causes the switch to animate.
* Applications should never connect to this signal, but use the
* notify::active signal.
*/
signals[ACTIVATE] =
g_signal_new (I_("activate"),
G_OBJECT_CLASS_TYPE (gobject_class),
G_SIGNAL_RUN_FIRST | G_SIGNAL_ACTION,
G_STRUCT_OFFSET (GtkSwitchClass, activate),
NULL, NULL,
NULL,
G_TYPE_NONE, 0);
widget_class->activate_signal = signals[ACTIVATE];
/**
* GtkSwitch::state-set:
* @widget: the object on which the signal was emitted
* @state: the new state of the switch
*
* The ::state-set signal on GtkSwitch is emitted to change the underlying
* state. It is emitted when the user changes the switch position. The
* default handler keeps the state in sync with the #GtkSwitch:active
* property.
*
* To implement delayed state change, applications can connect to this signal,
* initiate the change of the underlying state, and call gtk_switch_set_state()
* when the underlying state change is complete. The signal handler should
* return %TRUE to prevent the default handler from running.
*
* Visually, the underlying state is represented by the trough color of
* the switch, while the #GtkSwitch:active property is represented by the
* position of the switch.
*
* Returns: %TRUE to stop the signal emission
*
* Since: 3.14
*/
signals[STATE_SET] =
g_signal_new (I_("state-set"),
G_OBJECT_CLASS_TYPE (gobject_class),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GtkSwitchClass, state_set),
_gtk_boolean_handled_accumulator, NULL,
_gtk_marshal_BOOLEAN__BOOLEAN,
G_TYPE_BOOLEAN, 1,
G_TYPE_BOOLEAN);
g_object_class_override_property (gobject_class, PROP_ACTION_NAME, "action-name");
g_object_class_override_property (gobject_class, PROP_ACTION_TARGET, "action-target");
gtk_widget_class_set_accessible_type (widget_class, GTK_TYPE_SWITCH_ACCESSIBLE);
gtk_widget_class_set_accessible_role (widget_class, ATK_ROLE_TOGGLE_BUTTON);
gtk_widget_class_set_css_name (widget_class, "switch");
}
static void
gtk_switch_init (GtkSwitch *self)
{
GtkSwitchPrivate *priv;
GtkGesture *gesture;
GtkCssNode *widget_node;
priv = self->priv = gtk_switch_get_instance_private (self);
gtk_widget_set_has_window (GTK_WIDGET (self), FALSE);
gtk_widget_set_can_focus (GTK_WIDGET (self), TRUE);
widget_node = gtk_widget_get_css_node (GTK_WIDGET (self));
priv->gadget = gtk_css_custom_gadget_new_for_node (widget_node,
GTK_WIDGET (self),
gtk_switch_get_content_size,
gtk_switch_allocate_contents,
gtk_switch_render_trough,
NULL,
NULL);
priv->slider_gadget = gtk_css_custom_gadget_new ("slider",
GTK_WIDGET (self),
priv->gadget,
NULL,
NULL,
NULL,
gtk_switch_render_slider,
NULL,
NULL);
gesture = gtk_gesture_multi_press_new (GTK_WIDGET (self));
gtk_gesture_single_set_touch_only (GTK_GESTURE_SINGLE (gesture), FALSE);
gtk_gesture_single_set_exclusive (GTK_GESTURE_SINGLE (gesture), TRUE);
g_signal_connect (gesture, "pressed",
G_CALLBACK (gtk_switch_multipress_gesture_pressed), self);
g_signal_connect (gesture, "released",
G_CALLBACK (gtk_switch_multipress_gesture_released), self);
gtk_event_controller_set_propagation_phase (GTK_EVENT_CONTROLLER (gesture),
GTK_PHASE_BUBBLE);
priv->multipress_gesture = gesture;
gesture = gtk_gesture_pan_new (GTK_WIDGET (self),
GTK_ORIENTATION_HORIZONTAL);
gtk_gesture_single_set_touch_only (GTK_GESTURE_SINGLE (gesture), FALSE);
gtk_gesture_single_set_exclusive (GTK_GESTURE_SINGLE (gesture), TRUE);
g_signal_connect (gesture, "pan",
G_CALLBACK (gtk_switch_pan_gesture_pan), self);
g_signal_connect (gesture, "drag-end",
G_CALLBACK (gtk_switch_pan_gesture_drag_end), self);
gtk_event_controller_set_propagation_phase (GTK_EVENT_CONTROLLER (gesture),
GTK_PHASE_BUBBLE);
priv->pan_gesture = gesture;
gtk_switch_create_pango_layouts (self);
}
/**
* gtk_switch_new:
*
* Creates a new #GtkSwitch widget.
*
* Returns: the newly created #GtkSwitch instance
*
* Since: 3.0
*/
GtkWidget *
gtk_switch_new (void)
{
return g_object_new (GTK_TYPE_SWITCH, NULL);
}
/**
* gtk_switch_set_active:
* @sw: a #GtkSwitch
* @is_active: %TRUE if @sw should be active, and %FALSE otherwise
*
* Changes the state of @sw to the desired one.
*
* Since: 3.0
*/
void
gtk_switch_set_active (GtkSwitch *sw,
gboolean is_active)
{
GtkSwitchPrivate *priv;
g_return_if_fail (GTK_IS_SWITCH (sw));
gtk_switch_end_toggle_animation (sw);
is_active = !!is_active;
priv = sw->priv;
if (priv->is_active != is_active)
{
AtkObject *accessible;
gboolean handled;
priv->is_active = is_active;
if (priv->is_active)
priv->handle_pos = 1.0;
else
priv->handle_pos = 0.0;
g_signal_emit (sw, signals[STATE_SET], 0, is_active, &handled);
g_object_notify_by_pspec (G_OBJECT (sw), switch_props[PROP_ACTIVE]);
accessible = gtk_widget_get_accessible (GTK_WIDGET (sw));
atk_object_notify_state_change (accessible, ATK_STATE_CHECKED, priv->is_active);
gtk_widget_queue_allocate (GTK_WIDGET (sw));
}
}
/**
* gtk_switch_get_active:
* @sw: a #GtkSwitch
*
* Gets whether the #GtkSwitch is in its “on” or “off” state.
*
* Returns: %TRUE if the #GtkSwitch is active, and %FALSE otherwise
*
* Since: 3.0
*/
gboolean
gtk_switch_get_active (GtkSwitch *sw)
{
g_return_val_if_fail (GTK_IS_SWITCH (sw), FALSE);
return sw->priv->is_active;
}
/**
* gtk_switch_set_state:
* @sw: a #GtkSwitch
* @state: the new state
*
* Sets the underlying state of the #GtkSwitch.
*
* Normally, this is the same as #GtkSwitch:active, unless the switch
* is set up for delayed state changes. This function is typically
* called from a #GtkSwitch::state-set signal handler.
*
* See #GtkSwitch::state-set for details.
*
* Since: 3.14
*/
void
gtk_switch_set_state (GtkSwitch *sw,
gboolean state)
{
g_return_if_fail (GTK_IS_SWITCH (sw));
state = state != FALSE;
if (sw->priv->state == state)
return;
sw->priv->state = state;
/* This will be a no-op if we're switching the state in response
* to a UI change. We're setting active anyway, to catch 'spontaneous'
* state changes.
*/
gtk_switch_set_active (sw, state);
if (state)
gtk_widget_set_state_flags (GTK_WIDGET (sw), GTK_STATE_FLAG_CHECKED, FALSE);
else
gtk_widget_unset_state_flags (GTK_WIDGET (sw), GTK_STATE_FLAG_CHECKED);
g_object_notify (G_OBJECT (sw), "state");
}
/**
* gtk_switch_get_state:
* @sw: a #GtkSwitch
*
* Gets the underlying state of the #GtkSwitch.
*
* Returns: the underlying state
*
* Since: 3.14
*/
gboolean
gtk_switch_get_state (GtkSwitch *sw)
{
g_return_val_if_fail (GTK_IS_SWITCH (sw), FALSE);
return sw->priv->state;
}
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