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gtk2/gtk/gtkscalebutton.c
Emmanuele Bassi e7bd9adf3e Document the CSS class used for the ScaleButton popover 
Otherwise it's not easy to divine the selector for the scale widget
inside the popover.
2019-12-22 19:12:20 +00:00

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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 <math.h>
#include <stdlib.h>
#include <string.h>
#include "gtkadjustment.h"
#include "gtkbindings.h"
#include "gtkframe.h"
#include "gtkmain.h"
#include "gtkmarshalers.h"
#include "gtkorientable.h"
#include "gtkpopover.h"
#include "gtkprivate.h"
#include "gtkscale.h"
#include "gtkbox.h"
#include "gtkwindow.h"
#include "gtkwindowprivate.h"
#include "gtktypebuiltins.h"
#include "gtkintl.h"
#include "a11y/gtkscalebuttonaccessible.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.
*
* The popup widget that contains the scale has a .scale-popup style class.
*/
#define SCALE_SIZE 100
#define CLICK_TIMEOUT 250
enum
{
VALUE_CHANGED,
POPUP,
POPDOWN,
LAST_SIGNAL
};
enum
{
PROP_0,
PROP_ORIENTATION,
PROP_VALUE,
PROP_SIZE,
PROP_ADJUSTMENT,
PROP_ICONS
};
struct _GtkScaleButtonPrivate
{
GtkWidget *plus_button;
GtkWidget *minus_button;
GtkWidget *dock;
GtkWidget *box;
GtkWidget *scale;
GtkWidget *image;
GtkWidget *active_button;
GtkIconSize size;
GtkOrientation orientation;
GtkOrientation applied_orientation;
guint click_id;
gchar **icon_list;
GtkAdjustment *adjustment; /* needed because it must be settable in init() */
};
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_set_orientation_private (GtkScaleButton *button,
GtkOrientation orientation);
static gboolean gtk_scale_button_scroll (GtkWidget *widget,
GdkEventScroll *event);
static void gtk_scale_button_clicked (GtkButton *button);
static void gtk_scale_button_popup (GtkWidget *widget);
static void gtk_scale_button_popdown (GtkWidget *widget);
static gboolean cb_button_press (GtkWidget *widget,
GdkEventButton *event,
gpointer user_data);
static gboolean cb_button_release (GtkWidget *widget,
GdkEventButton *event,
gpointer user_data);
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);
G_DEFINE_TYPE_WITH_CODE (GtkScaleButton, gtk_scale_button, GTK_TYPE_BUTTON,
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);
GtkButtonClass *button_class = GTK_BUTTON_CLASS (klass);
GtkBindingSet *binding_set;
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->scroll_event = gtk_scale_button_scroll;
button_class->clicked = gtk_scale_button_clicked;
/**
* 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.
*
* Since: 2.14
**/
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_SIZE,
g_param_spec_enum ("size",
P_("Icon size"),
P_("The icon size"),
GTK_TYPE_ICON_SIZE,
GTK_ICON_SIZE_SMALL_TOOLBAR,
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.
*
* Since: 2.12
*/
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.
*
* Since: 2.12
*/
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.
*
* Since: 2.12
*/
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.
*
* Since: 2.12
*/
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 */
binding_set = gtk_binding_set_by_class (widget_class);
gtk_binding_entry_add_signal (binding_set, GDK_KEY_space, 0,
"popup", 0);
gtk_binding_entry_add_signal (binding_set, GDK_KEY_KP_Space, 0,
"popup", 0);
gtk_binding_entry_add_signal (binding_set, GDK_KEY_Return, 0,
"popup", 0);
gtk_binding_entry_add_signal (binding_set, GDK_KEY_ISO_Enter, 0,
"popup", 0);
gtk_binding_entry_add_signal (binding_set, GDK_KEY_KP_Enter, 0,
"popup", 0);
gtk_binding_entry_add_signal (binding_set, GDK_KEY_Escape, 0,
"popdown", 0);
/* 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_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_child_private (widget_class, GtkScaleButton, image);
gtk_widget_class_bind_template_callback (widget_class, cb_button_press);
gtk_widget_class_bind_template_callback (widget_class, cb_button_release);
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, "button");
}
static void
gtk_scale_button_init (GtkScaleButton *button)
{
GtkScaleButtonPrivate *priv;
GtkStyleContext *context;
button->priv = priv = gtk_scale_button_get_instance_private (button);
priv->click_id = 0;
priv->orientation = GTK_ORIENTATION_VERTICAL;
priv->applied_orientation = GTK_ORIENTATION_VERTICAL;
gtk_widget_init_template (GTK_WIDGET (button));
gtk_popover_set_relative_to (GTK_POPOVER (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_events (GTK_WIDGET (button), GDK_SMOOTH_SCROLL_MASK);
context = gtk_widget_get_style_context (GTK_WIDGET (button));
gtk_style_context_add_class (context, "scale");
}
static void
gtk_scale_button_constructed (GObject *object)
{
GtkScaleButton *button = GTK_SCALE_BUTTON (object);
GtkScaleButtonPrivate *priv = button->priv;
G_OBJECT_CLASS (gtk_scale_button_parent_class)->constructed (object);
/* set button text and size */
priv->size = GTK_ICON_SIZE_SMALL_TOOLBAR;
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_SIZE:
if (button->priv->size != g_value_get_enum (value))
{
button->priv->size = g_value_get_enum (value);
gtk_scale_button_update_icon (button);
g_object_notify_by_pspec (object, pspec);
}
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 = button->priv;
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_SIZE:
g_value_set_enum (value, priv->size);
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 = button->priv;
if (priv->icon_list)
{
g_strfreev (priv->icon_list);
priv->icon_list = NULL;
}
if (priv->adjustment)
{
g_object_unref (priv->adjustment);
priv->adjustment = NULL;
}
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 = button->priv;
if (priv->dock)
{
gtk_widget_destroy (priv->dock);
priv->dock = NULL;
}
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:
* @size: (type int): a stock icon size (#GtkIconSize)
* @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
*
* Since: 2.12
*/
GtkWidget *
gtk_scale_button_new (GtkIconSize size,
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,
"size", size,
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
*
* Since: 2.12
*/
gdouble
gtk_scale_button_get_value (GtkScaleButton * button)
{
GtkScaleButtonPrivate *priv;
g_return_val_if_fail (GTK_IS_SCALE_BUTTON (button), 0);
priv = button->priv;
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.
*
* Since: 2.12
*/
void
gtk_scale_button_set_value (GtkScaleButton *button,
gdouble value)
{
GtkScaleButtonPrivate *priv;
g_return_if_fail (GTK_IS_SCALE_BUTTON (button));
priv = button->priv;
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.
*
* Since: 2.12
*/
void
gtk_scale_button_set_icons (GtkScaleButton *button,
const gchar **icons)
{
GtkScaleButtonPrivate *priv;
gchar **tmp;
g_return_if_fail (GTK_IS_SCALE_BUTTON (button));
priv = button->priv;
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
*
* Since: 2.12
*/
GtkAdjustment*
gtk_scale_button_get_adjustment (GtkScaleButton *button)
{
g_return_val_if_fail (GTK_IS_SCALE_BUTTON (button), NULL);
return button->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.
*
* Since: 2.12
*/
void
gtk_scale_button_set_adjustment (GtkScaleButton *button,
GtkAdjustment *adjustment)
{
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 (button->priv->adjustment != adjustment)
{
if (button->priv->adjustment)
g_object_unref (button->priv->adjustment);
button->priv->adjustment = g_object_ref_sink (adjustment);
if (button->priv->scale)
gtk_range_set_adjustment (GTK_RANGE (button->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
*
* Since: 2.14
*/
GtkWidget *
gtk_scale_button_get_plus_button (GtkScaleButton *button)
{
g_return_val_if_fail (GTK_IS_SCALE_BUTTON (button), NULL);
return button->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
*
* Since: 2.14
*/
GtkWidget *
gtk_scale_button_get_minus_button (GtkScaleButton *button)
{
g_return_val_if_fail (GTK_IS_SCALE_BUTTON (button), NULL);
return button->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
*
* Since: 2.14
*/
GtkWidget *
gtk_scale_button_get_popup (GtkScaleButton *button)
{
g_return_val_if_fail (GTK_IS_SCALE_BUTTON (button), NULL);
return button->priv->dock;
}
static void
apply_orientation (GtkScaleButton *button,
GtkOrientation orientation)
{
GtkScaleButtonPrivate *priv = button->priv;
if (priv->applied_orientation != orientation)
{
priv->applied_orientation = orientation;
gtk_orientable_set_orientation (GTK_ORIENTABLE (priv->box), orientation);
gtk_container_child_set (GTK_CONTAINER (priv->box),
priv->plus_button,
"pack-type",
orientation == GTK_ORIENTATION_VERTICAL ?
GTK_PACK_START : GTK_PACK_END,
NULL);
gtk_container_child_set (GTK_CONTAINER (priv->box),
priv->minus_button,
"pack-type",
orientation == GTK_ORIENTATION_VERTICAL ?
GTK_PACK_END : GTK_PACK_START,
NULL);
gtk_orientable_set_orientation (GTK_ORIENTABLE (priv->scale), orientation);
if (orientation == GTK_ORIENTATION_VERTICAL)
{
gtk_widget_set_size_request (GTK_WIDGET (priv->scale), -1, SCALE_SIZE);
gtk_range_set_inverted (GTK_RANGE (priv->scale), TRUE);
}
else
{
gtk_widget_set_size_request (GTK_WIDGET (priv->scale), SCALE_SIZE, -1);
gtk_range_set_inverted (GTK_RANGE (priv->scale), FALSE);
}
}
}
static void
gtk_scale_button_set_orientation_private (GtkScaleButton *button,
GtkOrientation orientation)
{
GtkScaleButtonPrivate *priv = button->priv;
if (priv->orientation != orientation)
{
priv->orientation = orientation;
g_object_notify (G_OBJECT (button), "orientation");
}
}
/*
* button callbacks.
*/
static gboolean
gtk_scale_button_scroll (GtkWidget *widget,
GdkEventScroll *event)
{
GtkScaleButton *button;
GtkScaleButtonPrivate *priv;
GtkAdjustment *adjustment;
gdouble d;
button = GTK_SCALE_BUTTON (widget);
priv = button->priv;
adjustment = priv->adjustment;
if (event->type != GDK_SCROLL)
return FALSE;
d = gtk_scale_button_get_value (button);
if (event->direction == GDK_SCROLL_UP)
{
d += gtk_adjustment_get_step_increment (adjustment);
if (d > gtk_adjustment_get_upper (adjustment))
d = gtk_adjustment_get_upper (adjustment);
}
else if (event->direction == GDK_SCROLL_DOWN)
{
d -= gtk_adjustment_get_step_increment (adjustment);
if (d < gtk_adjustment_get_lower (adjustment))
d = gtk_adjustment_get_lower (adjustment);
}
else if (event->direction == GDK_SCROLL_SMOOTH)
{
d -= event->delta_y * gtk_adjustment_get_step_increment (adjustment);
d = CLAMP (d, gtk_adjustment_get_lower (adjustment),
gtk_adjustment_get_upper (adjustment));
}
gtk_scale_button_set_value (button, d);
return TRUE;
}
static gboolean
gtk_scale_popup (GtkWidget *widget)
{
GtkScaleButton *button = GTK_SCALE_BUTTON (widget);
GtkScaleButtonPrivate *priv = button->priv;
GtkWidget *toplevel;
GtkBorder border;
GtkRequisition req;
gint w, h;
gint size;
gtk_popover_popup (GTK_POPOVER (priv->dock));
toplevel = gtk_widget_get_toplevel (widget);
_gtk_window_get_shadow_width (GTK_WINDOW (toplevel), &border);
w = gtk_widget_get_allocated_width (toplevel) - border.left - border.right;
h = gtk_widget_get_allocated_height (toplevel) - border.top - border.bottom;
gtk_widget_get_preferred_size (priv->dock, NULL, &req);
size = MAX (req.width, req.height);
if (size > w)
apply_orientation (button, GTK_ORIENTATION_VERTICAL);
else if (size > h)
apply_orientation (button, GTK_ORIENTATION_HORIZONTAL);
else
apply_orientation (button, priv->orientation);
return TRUE;
}
static void
gtk_scale_button_popdown (GtkWidget *widget)
{
GtkScaleButton *button = GTK_SCALE_BUTTON (widget);
GtkScaleButtonPrivate *priv = button->priv;
gtk_popover_popdown (GTK_POPOVER (priv->dock));
}
static void
gtk_scale_button_clicked (GtkButton *button)
{
gtk_scale_popup (GTK_WIDGET (button));
}
static void
gtk_scale_button_popup (GtkWidget *widget)
{
gtk_scale_popup (widget);
}
/*
* +/- button callbacks.
*/
static gboolean
button_click (GtkScaleButton *button,
GtkWidget *active)
{
GtkScaleButtonPrivate *priv = button->priv;
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 gboolean
cb_button_timeout (gpointer user_data)
{
GtkScaleButton *button = GTK_SCALE_BUTTON (user_data);
GtkScaleButtonPrivate *priv = button->priv;
gboolean res;
if (priv->click_id == 0)
return G_SOURCE_REMOVE;
res = button_click (button, priv->active_button);
if (!res)
{
g_source_remove (priv->click_id);
priv->click_id = 0;
}
return res;
}
static gboolean
cb_button_press (GtkWidget *widget,
GdkEventButton *event,
gpointer user_data)
{
GtkScaleButton *button = GTK_SCALE_BUTTON (user_data);
GtkScaleButtonPrivate *priv = button->priv;
gint double_click_time;
if (priv->click_id != 0)
g_source_remove (priv->click_id);
priv->active_button = widget;
g_object_get (gtk_widget_get_settings (widget),
"gtk-double-click-time", &double_click_time,
NULL);
priv->click_id = gdk_threads_add_timeout (double_click_time,
cb_button_timeout,
button);
g_source_set_name_by_id (priv->click_id, "[gtk+] cb_button_timeout");
cb_button_timeout (button);
return TRUE;
}
static gboolean
cb_button_release (GtkWidget *widget,
GdkEventButton *event,
gpointer user_data)
{
GtkScaleButton *button = GTK_SCALE_BUTTON (user_data);
GtkScaleButtonPrivate *priv = button->priv;
if (priv->click_id != 0)
{
g_source_remove (priv->click_id);
priv->click_id = 0;
}
return TRUE;
}
static void
cb_button_clicked (GtkWidget *widget,
gpointer user_data)
{
GtkScaleButton *button = GTK_SCALE_BUTTON (user_data);
GtkScaleButtonPrivate *priv = button->priv;
if (priv->click_id != 0)
return;
button_click (button, widget);
}
static void
gtk_scale_button_update_icon (GtkScaleButton *button)
{
GtkScaleButtonPrivate *priv = button->priv;
GtkAdjustment *adjustment;
gdouble value;
const gchar *name;
guint num_icons;
if (!priv->icon_list || priv->icon_list[0][0] == '\0')
{
gtk_image_set_from_icon_name (GTK_IMAGE (priv->image),
"image-missing",
priv->size);
return;
}
num_icons = g_strv_length (priv->icon_list);
/* The 1-icon special case */
if (num_icons == 1)
{
gtk_image_set_from_icon_name (GTK_IMAGE (priv->image),
priv->icon_list[0],
priv->size);
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_image_set_from_icon_name (GTK_IMAGE (priv->image),
name,
priv->size);
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_image_set_from_icon_name (GTK_IMAGE (priv->image),
name,
priv->size);
}
static void
cb_scale_value_changed (GtkRange *range,
gpointer user_data)
{
GtkScaleButton *button = user_data;
gdouble value;
gdouble upper, lower;
value = gtk_range_get_value (range);
upper = gtk_adjustment_get_upper (button->priv->adjustment);
lower = gtk_adjustment_get_lower (button->priv->adjustment);
gtk_scale_button_update_icon (button);
gtk_widget_set_sensitive (button->priv->plus_button, value < upper);
gtk_widget_set_sensitive (button->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 = button->priv;
gtk_widget_grab_focus (priv->scale);
}
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