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gtk2/gtk/gtkscalebutton.c
Matthias Clasen 822c2aba36 scalebutton: Don't derive from GtkButton 
Make GtkScaleButton a widget that has a toggle button
as a child, just like all the other button widgets now.
The immediate benefit of this arrangement is to avoid
the "double focus" problem when we pop up the popup.

Update accessible, demos and tests to match.
2020-04-09 20:43:45 -04:00

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/* GTK - The GIMP Toolkit
* Copyright (C) 2005 Ronald S. Bultje
* Copyright (C) 2006, 2007 Christian Persch
* Copyright (C) 2006 Jan Arne Petersen
* Copyright (C) 2005-2007 Red Hat, Inc.
* Copyright (C) 2014 Red Hat, Inc.
*
* Authors:
* - Ronald S. Bultje <rbultje@ronald.bitfreak.net>
* - Bastien Nocera <bnocera@redhat.com>
* - Jan Arne Petersen <jpetersen@jpetersen.org>
* - Christian Persch <chpe@svn.gnome.org>
*
* 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/>.
*/
/*
* Modified by the GTK+ Team and others 2007. 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 "gtkscalebutton.h"
#include "gtkadjustment.h"
#include "gtkbox.h"
#include "gtkbuttonprivate.h"
#include "gtktogglebutton.h"
#include "gtkeventcontrollerscroll.h"
#include "gtkframe.h"
#include "gtkgesture.h"
#include "gtkintl.h"
#include "gtkmain.h"
#include "gtkmarshalers.h"
#include "gtkorientable.h"
#include "gtkpopover.h"
#include "gtkprivate.h"
#include "gtkrangeprivate.h"
#include "gtkscale.h"
#include "gtktypebuiltins.h"
#include "gtkwidgetprivate.h"
#include "gtkwindowprivate.h"
#include "gtknative.h"
#include "a11y/gtkscalebuttonaccessible.h"
#include <math.h>
#include <stdlib.h>
#include <string.h>
/**
* SECTION:gtkscalebutton
* @Short_description: A button which pops up a scale
* @Title: GtkScaleButton
*
* #GtkScaleButton provides a button which pops up a scale widget.
* This kind of widget is commonly used for volume controls in multimedia
* applications, and GTK+ provides a #GtkVolumeButton subclass that
* is tailored for this use case.
*
* # CSS nodes
*
* GtkScaleButton has a single CSS node with name button. To differentiate
* it from a plain #GtkButton, it gets the .scale style class.
*/
#define SCALE_SIZE 100
enum
{
VALUE_CHANGED,
POPUP,
POPDOWN,
LAST_SIGNAL
};
enum
{
PROP_0,
PROP_ORIENTATION,
PROP_VALUE,
PROP_SIZE,
PROP_ADJUSTMENT,
PROP_ICONS
};
typedef struct
{
GtkWidget *button;
GtkWidget *plus_button;
GtkWidget *minus_button;
GtkWidget *dock;
GtkWidget *box;
GtkWidget *scale;
GtkWidget *active_button;
GtkOrientation orientation;
GtkOrientation applied_orientation;
guint autoscroll_timeout;
GtkScrollType autoscroll_step;
gboolean autoscrolling;
guint click_id;
gchar **icon_list;
GtkAdjustment *adjustment; /* needed because it must be settable in init() */
} GtkScaleButtonPrivate;
static void gtk_scale_button_constructed (GObject *object);
static void gtk_scale_button_dispose (GObject *object);
static void gtk_scale_button_finalize (GObject *object);
static void gtk_scale_button_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec);
static void gtk_scale_button_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec);
static void gtk_scale_button_size_allocate (GtkWidget *widget,
int width,
int height,
int baseline);
static void gtk_scale_button_measure (GtkWidget *widget,
GtkOrientation orientation,
int for_size,
int *minimum,
int *natural,
int *minimum_baseline,
int *natural_baseline);
static void gtk_scale_button_set_orientation_private (GtkScaleButton *button,
GtkOrientation orientation);
static void gtk_scale_button_popup (GtkWidget *widget);
static void gtk_scale_button_popdown (GtkWidget *widget);
static void cb_button_clicked (GtkWidget *button,
gpointer user_data);
static void gtk_scale_button_update_icon (GtkScaleButton *button);
static void cb_scale_value_changed (GtkRange *range,
gpointer user_data);
static void cb_popup_mapped (GtkWidget *popup,
gpointer user_data);
static gboolean gtk_scale_button_scroll_controller_scroll (GtkEventControllerScroll *scroll,
gdouble dx,
gdouble dy,
GtkScaleButton *button);
G_DEFINE_TYPE_WITH_CODE (GtkScaleButton, gtk_scale_button, GTK_TYPE_WIDGET,
G_ADD_PRIVATE (GtkScaleButton)
G_IMPLEMENT_INTERFACE (GTK_TYPE_ORIENTABLE, NULL))
static guint signals[LAST_SIGNAL] = { 0, };
static void
gtk_scale_button_class_init (GtkScaleButtonClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
gobject_class->constructed = gtk_scale_button_constructed;
gobject_class->finalize = gtk_scale_button_finalize;
gobject_class->dispose = gtk_scale_button_dispose;
gobject_class->set_property = gtk_scale_button_set_property;
gobject_class->get_property = gtk_scale_button_get_property;
widget_class->measure = gtk_scale_button_measure;
widget_class->size_allocate = gtk_scale_button_size_allocate;
widget_class->focus = gtk_widget_focus_child;
widget_class->grab_focus = gtk_widget_grab_focus_child;
/**
* GtkScaleButton:orientation:
*
* The orientation of the #GtkScaleButton's popup window.
*
* Note that since GTK+ 2.16, #GtkScaleButton implements the
* #GtkOrientable interface which has its own @orientation
* property. However we redefine the property here in order to
* override its default horizontal orientation.
**/
g_object_class_override_property (gobject_class,
PROP_ORIENTATION,
"orientation");
g_object_class_install_property (gobject_class,
PROP_VALUE,
g_param_spec_double ("value",
P_("Value"),
P_("The value of the scale"),
-G_MAXDOUBLE,
G_MAXDOUBLE,
0,
GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY));
g_object_class_install_property (gobject_class,
PROP_ADJUSTMENT,
g_param_spec_object ("adjustment",
P_("Adjustment"),
P_("The GtkAdjustment that contains the current value of this scale button object"),
GTK_TYPE_ADJUSTMENT,
GTK_PARAM_READWRITE));
/**
* GtkScaleButton:icons:
*
* The names of the icons to be used by the scale button.
* The first item in the array will be used in the button
* when the current value is the lowest value, the second
* item for the highest value. All the subsequent icons will
* be used for all the other values, spread evenly over the
* range of values.
*
* If there's only one icon name in the @icons array, it will
* be used for all the values. If only two icon names are in
* the @icons array, the first one will be used for the bottom
* 50% of the scale, and the second one for the top 50%.
*
* It is recommended to use at least 3 icons so that the
* #GtkScaleButton reflects the current value of the scale
* better for the users.
*/
g_object_class_install_property (gobject_class,
PROP_ICONS,
g_param_spec_boxed ("icons",
P_("Icons"),
P_("List of icon names"),
G_TYPE_STRV,
GTK_PARAM_READWRITE));
/**
* GtkScaleButton::value-changed:
* @button: the object which received the signal
* @value: the new value
*
* The ::value-changed signal is emitted when the value field has
* changed.
*/
signals[VALUE_CHANGED] =
g_signal_new (I_("value-changed"),
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GtkScaleButtonClass, value_changed),
NULL, NULL,
NULL,
G_TYPE_NONE, 1, G_TYPE_DOUBLE);
/**
* GtkScaleButton::popup:
* @button: the object which received the signal
*
* The ::popup signal is a
* [keybinding signal][GtkBindingSignal]
* which gets emitted to popup the scale widget.
*
* The default bindings for this signal are Space, Enter and Return.
*/
signals[POPUP] =
g_signal_new_class_handler (I_("popup"),
G_OBJECT_CLASS_TYPE (klass),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_CALLBACK (gtk_scale_button_popup),
NULL, NULL,
NULL,
G_TYPE_NONE, 0);
/**
* GtkScaleButton::popdown:
* @button: the object which received the signal
*
* The ::popdown signal is a
* [keybinding signal][GtkBindingSignal]
* which gets emitted to popdown the scale widget.
*
* The default binding for this signal is Escape.
*/
signals[POPDOWN] =
g_signal_new_class_handler (I_("popdown"),
G_OBJECT_CLASS_TYPE (klass),
G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
G_CALLBACK (gtk_scale_button_popdown),
NULL, NULL,
NULL,
G_TYPE_NONE, 0);
/* Key bindings */
gtk_widget_class_add_binding_signal (widget_class,
GDK_KEY_space, 0,
"popup",
NULL);
gtk_widget_class_add_binding_signal (widget_class,
GDK_KEY_KP_Space, 0,
"popup",
NULL);
gtk_widget_class_add_binding_signal (widget_class,
GDK_KEY_Return, 0,
"popup",
NULL);
gtk_widget_class_add_binding_signal (widget_class,
GDK_KEY_ISO_Enter, 0,
"popup",
NULL);
gtk_widget_class_add_binding_signal (widget_class,
GDK_KEY_KP_Enter, 0,
"popup",
NULL);
gtk_widget_class_add_binding_signal (widget_class,
GDK_KEY_Escape, 0,
"popdown",
NULL);
/* Bind class to template
*/
gtk_widget_class_set_template_from_resource (widget_class,
"/org/gtk/libgtk/ui/gtkscalebutton.ui");
gtk_widget_class_bind_template_child_private (widget_class, GtkScaleButton, button);
gtk_widget_class_bind_template_child_internal_private (widget_class, GtkScaleButton, plus_button);
gtk_widget_class_bind_template_child_internal_private (widget_class, GtkScaleButton, minus_button);
gtk_widget_class_bind_template_child_private (widget_class, GtkScaleButton, dock);
gtk_widget_class_bind_template_child_private (widget_class, GtkScaleButton, box);
gtk_widget_class_bind_template_child_private (widget_class, GtkScaleButton, scale);
gtk_widget_class_bind_template_callback (widget_class, cb_button_clicked);
gtk_widget_class_bind_template_callback (widget_class, cb_scale_value_changed);
gtk_widget_class_bind_template_callback (widget_class, cb_popup_mapped);
gtk_widget_class_set_accessible_type (widget_class, GTK_TYPE_SCALE_BUTTON_ACCESSIBLE);
gtk_widget_class_set_css_name (widget_class, I_("scalebutton"));
}
static gboolean
start_autoscroll (gpointer data)
{
GtkScaleButton *button = data;
GtkScaleButtonPrivate *priv = gtk_scale_button_get_instance_private (button);
gtk_range_start_autoscroll (GTK_RANGE (priv->scale), priv->autoscroll_step);
priv->autoscrolling = TRUE;
priv->autoscroll_timeout = 0;
return G_SOURCE_REMOVE;
}
static void
button_pressed_cb (GtkGesture *gesture,
int n_press,
double x,
double y,
GtkScaleButton *button)
{
GtkScaleButtonPrivate *priv = gtk_scale_button_get_instance_private (button);
GtkWidget *widget;
widget = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (gesture));
if (widget == priv->plus_button)
priv->autoscroll_step = GTK_SCROLL_PAGE_FORWARD;
else
priv->autoscroll_step = GTK_SCROLL_PAGE_BACKWARD;
priv->autoscroll_timeout = g_timeout_add (200, start_autoscroll, button);
}
static void
gtk_scale_button_toggled (GtkScaleButton *button)
{
GtkScaleButtonPrivate *priv = gtk_scale_button_get_instance_private (button);
gboolean active;
active = gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (priv->button));
if (active)
gtk_popover_popup (GTK_POPOVER (priv->dock));
else
gtk_popover_popdown (GTK_POPOVER (priv->dock));
}
static void
gtk_scale_button_closed (GtkScaleButton *button)
{
GtkScaleButtonPrivate *priv = gtk_scale_button_get_instance_private (button);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (priv->button), FALSE);
}
static void
gtk_scale_button_init (GtkScaleButton *button)
{
GtkScaleButtonPrivate *priv = gtk_scale_button_get_instance_private (button);
GtkEventController *controller;
priv->click_id = 0;
priv->orientation = GTK_ORIENTATION_VERTICAL;
priv->applied_orientation = GTK_ORIENTATION_VERTICAL;
gtk_widget_init_template (GTK_WIDGET (button));
gtk_widget_set_parent (priv->dock, GTK_WIDGET (button));
/* Need a local reference to the adjustment */
priv->adjustment = gtk_adjustment_new (0, 0, 100, 2, 20, 0);
g_object_ref_sink (priv->adjustment);
gtk_range_set_adjustment (GTK_RANGE (priv->scale), priv->adjustment);
gtk_widget_add_css_class (GTK_WIDGET (button), "scale");
controller = gtk_event_controller_scroll_new (GTK_EVENT_CONTROLLER_SCROLL_VERTICAL);
g_signal_connect (controller, "scroll",
G_CALLBACK (gtk_scale_button_scroll_controller_scroll),
button);
gtk_widget_add_controller (GTK_WIDGET (button), controller);
g_signal_connect_swapped (priv->dock, "closed",
G_CALLBACK (gtk_scale_button_closed), button);
g_signal_connect_swapped (priv->button, "toggled",
G_CALLBACK (gtk_scale_button_toggled), button);
g_signal_connect (gtk_button_get_gesture (GTK_BUTTON (priv->plus_button)),
"pressed", G_CALLBACK (button_pressed_cb), button);
g_signal_connect (gtk_button_get_gesture (GTK_BUTTON (priv->minus_button)),
"pressed", G_CALLBACK (button_pressed_cb), button);
}
static void
gtk_scale_button_constructed (GObject *object)
{
GtkScaleButton *button = GTK_SCALE_BUTTON (object);
G_OBJECT_CLASS (gtk_scale_button_parent_class)->constructed (object);
/* set button text and size */
gtk_scale_button_update_icon (button);
}
static void
gtk_scale_button_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GtkScaleButton *button = GTK_SCALE_BUTTON (object);
switch (prop_id)
{
case PROP_ORIENTATION:
gtk_scale_button_set_orientation_private (button, g_value_get_enum (value));
break;
case PROP_VALUE:
gtk_scale_button_set_value (button, g_value_get_double (value));
break;
case PROP_ADJUSTMENT:
gtk_scale_button_set_adjustment (button, g_value_get_object (value));
break;
case PROP_ICONS:
gtk_scale_button_set_icons (button,
(const gchar **)g_value_get_boxed (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gtk_scale_button_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GtkScaleButton *button = GTK_SCALE_BUTTON (object);
GtkScaleButtonPrivate *priv = gtk_scale_button_get_instance_private (button);
switch (prop_id)
{
case PROP_ORIENTATION:
g_value_set_enum (value, priv->orientation);
break;
case PROP_VALUE:
g_value_set_double (value, gtk_scale_button_get_value (button));
break;
case PROP_ADJUSTMENT:
g_value_set_object (value, gtk_scale_button_get_adjustment (button));
break;
case PROP_ICONS:
g_value_set_boxed (value, priv->icon_list);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gtk_scale_button_finalize (GObject *object)
{
GtkScaleButton *button = GTK_SCALE_BUTTON (object);
GtkScaleButtonPrivate *priv = gtk_scale_button_get_instance_private (button);
if (priv->icon_list)
{
g_strfreev (priv->icon_list);
priv->icon_list = NULL;
}
if (priv->adjustment)
{
g_object_unref (priv->adjustment);
priv->adjustment = NULL;
}
if (priv->autoscroll_timeout)
g_source_remove (priv->autoscroll_timeout);
G_OBJECT_CLASS (gtk_scale_button_parent_class)->finalize (object);
}
static void
gtk_scale_button_dispose (GObject *object)
{
GtkScaleButton *button = GTK_SCALE_BUTTON (object);
GtkScaleButtonPrivate *priv = gtk_scale_button_get_instance_private (button);
g_clear_pointer (&priv->dock, gtk_widget_unparent);
g_clear_pointer (&priv->button, gtk_widget_unparent);
if (priv->click_id != 0)
{
g_source_remove (priv->click_id);
priv->click_id = 0;
}
G_OBJECT_CLASS (gtk_scale_button_parent_class)->dispose (object);
}
/**
* gtk_scale_button_new:
* @min: the minimum value of the scale (usually 0)
* @max: the maximum value of the scale (usually 100)
* @step: the stepping of value when a scroll-wheel event,
* or up/down arrow event occurs (usually 2)
* @icons: (allow-none) (array zero-terminated=1): a %NULL-terminated
* array of icon names, or %NULL if you want to set the list
* later with gtk_scale_button_set_icons()
*
* Creates a #GtkScaleButton, with a range between @min and @max, with
* a stepping of @step.
*
* Returns: a new #GtkScaleButton
*/
GtkWidget *
gtk_scale_button_new (gdouble min,
gdouble max,
gdouble step,
const gchar **icons)
{
GtkScaleButton *button;
GtkAdjustment *adjustment;
adjustment = gtk_adjustment_new (min, min, max, step, 10 * step, 0);
button = g_object_new (GTK_TYPE_SCALE_BUTTON,
"adjustment", adjustment,
"icons", icons,
NULL);
return GTK_WIDGET (button);
}
/**
* gtk_scale_button_get_value:
* @button: a #GtkScaleButton
*
* Gets the current value of the scale button.
*
* Returns: current value of the scale button
*/
gdouble
gtk_scale_button_get_value (GtkScaleButton * button)
{
GtkScaleButtonPrivate *priv = gtk_scale_button_get_instance_private (button);
g_return_val_if_fail (GTK_IS_SCALE_BUTTON (button), 0);
return gtk_adjustment_get_value (priv->adjustment);
}
/**
* gtk_scale_button_set_value:
* @button: a #GtkScaleButton
* @value: new value of the scale button
*
* Sets the current value of the scale; if the value is outside
* the minimum or maximum range values, it will be clamped to fit
* inside them. The scale button emits the #GtkScaleButton::value-changed
* signal if the value changes.
*/
void
gtk_scale_button_set_value (GtkScaleButton *button,
gdouble value)
{
GtkScaleButtonPrivate *priv = gtk_scale_button_get_instance_private (button);
g_return_if_fail (GTK_IS_SCALE_BUTTON (button));
gtk_range_set_value (GTK_RANGE (priv->scale), value);
g_object_notify (G_OBJECT (button), "value");
}
/**
* gtk_scale_button_set_icons:
* @button: a #GtkScaleButton
* @icons: (array zero-terminated=1): a %NULL-terminated array of icon names
*
* Sets the icons to be used by the scale button.
* For details, see the #GtkScaleButton:icons property.
*/
void
gtk_scale_button_set_icons (GtkScaleButton *button,
const gchar **icons)
{
GtkScaleButtonPrivate *priv = gtk_scale_button_get_instance_private (button);
gchar **tmp;
g_return_if_fail (GTK_IS_SCALE_BUTTON (button));
tmp = priv->icon_list;
priv->icon_list = g_strdupv ((gchar **) icons);
g_strfreev (tmp);
gtk_scale_button_update_icon (button);
g_object_notify (G_OBJECT (button), "icons");
}
/**
* gtk_scale_button_get_adjustment:
* @button: a #GtkScaleButton
*
* Gets the #GtkAdjustment associated with the #GtkScaleButton’s scale.
* See gtk_range_get_adjustment() for details.
*
* Returns: (transfer none): the adjustment associated with the scale
*/
GtkAdjustment*
gtk_scale_button_get_adjustment (GtkScaleButton *button)
{
GtkScaleButtonPrivate *priv = gtk_scale_button_get_instance_private (button);
g_return_val_if_fail (GTK_IS_SCALE_BUTTON (button), NULL);
return priv->adjustment;
}
/**
* gtk_scale_button_set_adjustment:
* @button: a #GtkScaleButton
* @adjustment: a #GtkAdjustment
*
* Sets the #GtkAdjustment to be used as a model
* for the #GtkScaleButton’s scale.
* See gtk_range_set_adjustment() for details.
*/
void
gtk_scale_button_set_adjustment (GtkScaleButton *button,
GtkAdjustment *adjustment)
{
GtkScaleButtonPrivate *priv = gtk_scale_button_get_instance_private (button);
g_return_if_fail (GTK_IS_SCALE_BUTTON (button));
if (!adjustment)
adjustment = gtk_adjustment_new (0.0, 0.0, 0.0, 0.0, 0.0, 0.0);
else
g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
if (priv->adjustment != adjustment)
{
if (priv->adjustment)
g_object_unref (priv->adjustment);
priv->adjustment = g_object_ref_sink (adjustment);
if (priv->scale)
gtk_range_set_adjustment (GTK_RANGE (priv->scale), adjustment);
g_object_notify (G_OBJECT (button), "adjustment");
}
}
/**
* gtk_scale_button_get_plus_button:
* @button: a #GtkScaleButton
*
* Retrieves the plus button of the #GtkScaleButton.
*
* Returns: (transfer none) (type Gtk.Button): the plus button of the #GtkScaleButton as a #GtkButton
*/
GtkWidget *
gtk_scale_button_get_plus_button (GtkScaleButton *button)
{
GtkScaleButtonPrivate *priv = gtk_scale_button_get_instance_private (button);
g_return_val_if_fail (GTK_IS_SCALE_BUTTON (button), NULL);
return priv->plus_button;
}
/**
* gtk_scale_button_get_minus_button:
* @button: a #GtkScaleButton
*
* Retrieves the minus button of the #GtkScaleButton.
*
* Returns: (transfer none) (type Gtk.Button): the minus button of the #GtkScaleButton as a #GtkButton
*/
GtkWidget *
gtk_scale_button_get_minus_button (GtkScaleButton *button)
{
GtkScaleButtonPrivate *priv = gtk_scale_button_get_instance_private (button);
g_return_val_if_fail (GTK_IS_SCALE_BUTTON (button), NULL);
return priv->minus_button;
}
/**
* gtk_scale_button_get_popup:
* @button: a #GtkScaleButton
*
* Retrieves the popup of the #GtkScaleButton.
*
* Returns: (transfer none): the popup of the #GtkScaleButton
*/
GtkWidget *
gtk_scale_button_get_popup (GtkScaleButton *button)
{
GtkScaleButtonPrivate *priv = gtk_scale_button_get_instance_private (button);
g_return_val_if_fail (GTK_IS_SCALE_BUTTON (button), NULL);
return priv->dock;
}
static void
gtk_scale_button_set_orientation_private (GtkScaleButton *button,
GtkOrientation orientation)
{
GtkScaleButtonPrivate *priv = gtk_scale_button_get_instance_private (button);
if (priv->orientation != orientation)
{
priv->orientation = orientation;
g_object_notify (G_OBJECT (button), "orientation");
}
}
static gboolean
gtk_scale_button_scroll_controller_scroll (GtkEventControllerScroll *scroll,
gdouble dx,
gdouble dy,
GtkScaleButton *button)
{
GtkScaleButtonPrivate *priv = gtk_scale_button_get_instance_private (button);
GtkAdjustment *adjustment;
gdouble d;
adjustment = priv->adjustment;
d = CLAMP (gtk_scale_button_get_value (button) -
(dy * gtk_adjustment_get_step_increment (adjustment)),
gtk_adjustment_get_lower (adjustment),
gtk_adjustment_get_upper (adjustment));
gtk_scale_button_set_value (button, d);
return GDK_EVENT_STOP;
}
/*
* button callbacks.
*/
static void
gtk_scale_popup (GtkWidget *widget)
{
GtkScaleButton *button = GTK_SCALE_BUTTON (widget);
GtkScaleButtonPrivate *priv = gtk_scale_button_get_instance_private (button);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (priv->button), TRUE);
}
static void
gtk_scale_button_popdown (GtkWidget *widget)
{
GtkScaleButton *button = GTK_SCALE_BUTTON (widget);
GtkScaleButtonPrivate *priv = gtk_scale_button_get_instance_private (button);
gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (priv->button), FALSE);
}
static void
gtk_scale_button_popup (GtkWidget *widget)
{
gtk_scale_popup (widget);
}
/*
* +/- button callbacks.
*/
static gboolean
button_click (GtkScaleButton *button,
GtkWidget *active)
{
GtkScaleButtonPrivate *priv = gtk_scale_button_get_instance_private (button);
GtkAdjustment *adjustment = priv->adjustment;
gboolean can_continue = TRUE;
gdouble val;
val = gtk_scale_button_get_value (button);
if (active == priv->plus_button)
val += gtk_adjustment_get_page_increment (adjustment);
else
val -= gtk_adjustment_get_page_increment (adjustment);
if (val <= gtk_adjustment_get_lower (adjustment))
{
can_continue = FALSE;
val = gtk_adjustment_get_lower (adjustment);
}
else if (val > gtk_adjustment_get_upper (adjustment))
{
can_continue = FALSE;
val = gtk_adjustment_get_upper (adjustment);
}
gtk_scale_button_set_value (button, val);
return can_continue;
}
static void
cb_button_clicked (GtkWidget *widget,
gpointer user_data)
{
GtkScaleButton *button = GTK_SCALE_BUTTON (user_data);
GtkScaleButtonPrivate *priv = gtk_scale_button_get_instance_private (button);
if (priv->autoscroll_timeout)
{
g_source_remove (priv->autoscroll_timeout);
priv->autoscroll_timeout = 0;
}
if (priv->autoscrolling)
{
gtk_range_stop_autoscroll (GTK_RANGE (priv->scale));
priv->autoscrolling = FALSE;
return;
}
button_click (button, widget);
}
static void
gtk_scale_button_update_icon (GtkScaleButton *button)
{
GtkScaleButtonPrivate *priv = gtk_scale_button_get_instance_private (button);
GtkAdjustment *adjustment;
gdouble value;
const gchar *name;
guint num_icons;
if (!priv->icon_list || priv->icon_list[0][0] == '\0')
{
gtk_button_set_icon_name (GTK_BUTTON (priv->button), "image-missing");
return;
}
num_icons = g_strv_length (priv->icon_list);
/* The 1-icon special case */
if (num_icons == 1)
{
gtk_button_set_icon_name (GTK_BUTTON (priv->button), priv->icon_list[0]);
return;
}
adjustment = priv->adjustment;
value = gtk_scale_button_get_value (button);
/* The 2-icons special case */
if (num_icons == 2)
{
gdouble limit;
limit = (gtk_adjustment_get_upper (adjustment) - gtk_adjustment_get_lower (adjustment)) / 2 + gtk_adjustment_get_lower (adjustment);
if (value < limit)
name = priv->icon_list[0];
else
name = priv->icon_list[1];
gtk_button_set_icon_name (GTK_BUTTON (priv->button), name);
return;
}
/* With 3 or more icons */
if (value == gtk_adjustment_get_lower (adjustment))
{
name = priv->icon_list[0];
}
else if (value == gtk_adjustment_get_upper (adjustment))
{
name = priv->icon_list[1];
}
else
{
gdouble step;
guint i;
step = (gtk_adjustment_get_upper (adjustment) - gtk_adjustment_get_lower (adjustment)) / (num_icons - 2); i = (guint) ((value - gtk_adjustment_get_lower (adjustment)) / step) + 2;
g_assert (i < num_icons);
name = priv->icon_list[i];
}
gtk_button_set_icon_name (GTK_BUTTON (priv->button), name);
}
static void
cb_scale_value_changed (GtkRange *range,
gpointer user_data)
{
GtkScaleButton *button = user_data;
GtkScaleButtonPrivate *priv = gtk_scale_button_get_instance_private (button);
gdouble value;
gdouble upper, lower;
value = gtk_range_get_value (range);
upper = gtk_adjustment_get_upper (priv->adjustment);
lower = gtk_adjustment_get_lower (priv->adjustment);
gtk_scale_button_update_icon (button);
gtk_widget_set_sensitive (priv->plus_button, value < upper);
gtk_widget_set_sensitive (priv->minus_button, lower < value);
g_signal_emit (button, signals[VALUE_CHANGED], 0, value);
g_object_notify (G_OBJECT (button), "value");
}
static void
cb_popup_mapped (GtkWidget *popup,
gpointer user_data)
{
GtkScaleButton *button = user_data;
GtkScaleButtonPrivate *priv = gtk_scale_button_get_instance_private (button);
gtk_widget_grab_focus (priv->scale);
}
static void
gtk_scale_button_measure (GtkWidget *widget,
GtkOrientation orientation,
int for_size,
int *minimum,
int *natural,
int *minimum_baseline,
int *natural_baseline)
{
GtkScaleButton *button = GTK_SCALE_BUTTON (widget);
GtkScaleButtonPrivate *priv = gtk_scale_button_get_instance_private (button);
gtk_widget_measure (priv->button,
orientation,
for_size,
minimum, natural,
minimum_baseline, natural_baseline);
}
static void
gtk_scale_button_size_allocate (GtkWidget *widget,
int width,
int height,
int baseline)
{
GtkScaleButton *button = GTK_SCALE_BUTTON (widget);
GtkScaleButtonPrivate *priv = gtk_scale_button_get_instance_private (button);
gtk_widget_size_allocate (priv->button,
&(GtkAllocation) { 0, 0, width, height },
baseline);
gtk_native_check_resize (GTK_NATIVE (priv->dock));
}
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