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Learning_GTK4_tree/gtk/gtkscalebutton.c

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2023-12-12 11:36:42 +01:00
/* 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 "gtkaccessiblerange.h"
#include "gtkadjustment.h"
#include "gtkbox.h"
#include "gtkbuttonprivate.h"
#include "gtktogglebutton.h"
#include "gtkeventcontrollerscroll.h"
#include "gtkframe.h"
#include "gtkgesture.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 <math.h>
#include <stdlib.h>
#include <string.h>
/**
* 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 [class@Gtk.VolumeButton] subclass that
* is tailored for this use case.
*
* # CSS nodes
*
* ```
* scalebutton.scale
* ╰── button.toggle
* ╰── <icon>
* ```
*
* `GtkScaleButton` has a single CSS node with name scalebutton and `.scale`
* style class, and contains a `button` node with a `.toggle` 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,
PROP_ACTIVE
};
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;
char **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,
double dx,
double dy,
GtkScaleButton *button);
static void gtk_scale_button_accessible_range_init (GtkAccessibleRangeInterface *iface);
G_DEFINE_TYPE_WITH_CODE (GtkScaleButton, gtk_scale_button, GTK_TYPE_WIDGET,
G_ADD_PRIVATE (GtkScaleButton)
G_IMPLEMENT_INTERFACE (GTK_TYPE_ACCESSIBLE_RANGE,
gtk_scale_button_accessible_range_init)
G_IMPLEMENT_INTERFACE (GTK_TYPE_ORIENTABLE, NULL))
static guint signals[LAST_SIGNAL] = { 0, };
static gboolean
accessible_range_set_current_value (GtkAccessibleRange *accessible_range,
double value)
{
gtk_scale_button_set_value (GTK_SCALE_BUTTON (accessible_range), value);
return TRUE;
}
static void
gtk_scale_button_accessible_range_init (GtkAccessibleRangeInterface *iface)
{
iface->set_current_value = accessible_range_set_current_value;
}
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;
g_object_class_override_property (gobject_class, PROP_ORIENTATION, "orientation");
/**
* GtkScaleButton:value: (attributes org.gtk.Property.get=gtk_scale_button_get_value org.gtk.Property.set=gtk_scale_button_set_value)
*
* The value of the scale.
*/
g_object_class_install_property (gobject_class,
PROP_VALUE,
g_param_spec_double ("value", NULL, NULL,
-G_MAXDOUBLE,
G_MAXDOUBLE,
0,
GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY));
/**
* GtkScaleButton:adjustment: (attributes org.gtk.Property.get=gtk_scale_button_get_adjustment org.gtk.Property.set=gtk_scale_button_set_adjustment)
*
* The `GtkAdjustment` that is used as the model.
*/
g_object_class_install_property (gobject_class,
PROP_ADJUSTMENT,
g_param_spec_object ("adjustment", NULL, NULL,
GTK_TYPE_ADJUSTMENT,
GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY));
/**
* GtkScaleButton:icons: (attributes org.gtk.Property.set=gtk_scale_button_set_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", NULL, NULL,
G_TYPE_STRV,
GTK_PARAM_READWRITE));
/**
* GtkScaleButton:active: (attributes org.gtk.Property.get=gtk_scale_button_get_active)
*
* If the scale button should be pressed in.
*
* Since: 4.10
*/
g_object_class_install_property (gobject_class,
PROP_ACTIVE,
g_param_spec_boolean ("active", NULL, NULL,
FALSE,
GTK_PARAM_READABLE));
/**
* GtkScaleButton::value-changed:
* @button: the object which received the signal
* @value: the new value
*
* 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
*
* Emitted to popup the scale widget.
*
* This is a [keybinding signal](class.SignalAction.html).
*
* The default bindings for this signal are <kbd>Space</kbd>,
* <kbd>Enter</kbd> and <kbd>Return</kbd>.
*/
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
*
* Emitted to dismiss the popup.
*
* This is a [keybinding signal](class.SignalAction.html).
*
* The default binding for this signal is <kbd>Escape</kbd>.
*/
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_css_name (widget_class, I_("scalebutton"));
gtk_widget_class_set_accessible_role (widget_class, GTK_ACCESSIBLE_ROLE_GROUP);
}
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;
g_object_notify (G_OBJECT (button), "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->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_accessible_update_property (GTK_ACCESSIBLE (button),
GTK_ACCESSIBLE_PROPERTY_VALUE_MAX, gtk_adjustment_get_upper (priv->adjustment),
GTK_ACCESSIBLE_PROPERTY_VALUE_MIN, gtk_adjustment_get_lower (priv->adjustment),
GTK_ACCESSIBLE_PROPERTY_VALUE_NOW, gtk_adjustment_get_value (priv->adjustment),
-1);
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 char **)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;
case PROP_ACTIVE:
g_value_set_boolean (value, gtk_scale_button_get_active (button));
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);
g_clear_pointer (&priv->icon_list, g_strfreev);
g_clear_object (&priv->adjustment);
g_clear_handle_id (&priv->autoscroll_timeout, g_source_remove);
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);
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: (nullable) (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`.
*
* The new scale button has a range between @min and @max,
* with a stepping of @step.
*
* Returns: a new `GtkScaleButton`
*/
GtkWidget *
gtk_scale_button_new (double min,
double max,
double step,
const char **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: (attributes org.gtk.Method.get_property=value)
* @button: a `GtkScaleButton`
*
* Gets the current value of the scale button.
*
* Returns: current value of the scale button
*/
double
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: (attributes org.gtk.Method.set_property=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 [signal@Gtk.ScaleButton::value-changed]
* signal if the value changes.
*/
void
gtk_scale_button_set_value (GtkScaleButton *button,
double 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: (attributes org.gtk.Method.set_property=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.
*/
void
gtk_scale_button_set_icons (GtkScaleButton *button,
const char **icons)
{
GtkScaleButtonPrivate *priv = gtk_scale_button_get_instance_private (button);
char **tmp;
g_return_if_fail (GTK_IS_SCALE_BUTTON (button));
tmp = priv->icon_list;
priv->icon_list = g_strdupv ((char **) icons);
g_strfreev (tmp);
gtk_scale_button_update_icon (button);
g_object_notify (G_OBJECT (button), "icons");
}
/**
* gtk_scale_button_get_adjustment: (attributes org.gtk.Method.get_property=adjustment)
* @button: a `GtkScaleButton`
*
* Gets the `GtkAdjustment` associated with the `GtkScaleButton`’s scale.
*
* See [method@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: (attributes org.gtk.Method.set_property=adjustment)
* @button: a `GtkScaleButton`
* @adjustment: a `GtkAdjustment`
*
* Sets the `GtkAdjustment` to be used as a model
* for the `GtkScaleButton`’s scale.
*
* See [method@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_accessible_update_property (GTK_ACCESSIBLE (button),
GTK_ACCESSIBLE_PROPERTY_VALUE_MAX, gtk_adjustment_get_upper (adjustment),
GTK_ACCESSIBLE_PROPERTY_VALUE_MIN, gtk_adjustment_get_lower (adjustment),
GTK_ACCESSIBLE_PROPERTY_VALUE_NOW, gtk_adjustment_get_value (adjustment),
-1);
}
}
/**
* 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`
*/
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`
*/
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;
}
/**
* gtk_scale_button_get_active: (attributes org.gtk.Method.get_property=active)
* @button: a `GtkScaleButton`
*
* Queries a `GtkScaleButton` and returns its current state.
*
* Returns %TRUE if the scale button is pressed in and %FALSE
* if it is raised.
*
* Returns: whether the button is pressed
*
* Since: 4.10
*/
gboolean
gtk_scale_button_get_active (GtkScaleButton *button)
{
GtkScaleButtonPrivate *priv = gtk_scale_button_get_instance_private (button);
g_return_val_if_fail (GTK_IS_SCALE_BUTTON (button), FALSE);
return gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (priv->button));
}
static void
apply_orientation (GtkScaleButton *button,
GtkOrientation orientation)
{
GtkScaleButtonPrivate *priv = gtk_scale_button_get_instance_private (button);
if (priv->applied_orientation != orientation)
{
priv->applied_orientation = orientation;
gtk_orientable_set_orientation (GTK_ORIENTABLE (priv->box), orientation);
gtk_orientable_set_orientation (GTK_ORIENTABLE (priv->scale), orientation);
if (orientation == GTK_ORIENTATION_VERTICAL)
{
gtk_box_reorder_child_after (GTK_BOX (priv->box), priv->scale,
priv->plus_button);
gtk_box_reorder_child_after (GTK_BOX (priv->box), priv->minus_button,
priv->scale);
gtk_widget_set_size_request (GTK_WIDGET (priv->scale), -1, SCALE_SIZE);
gtk_range_set_inverted (GTK_RANGE (priv->scale), TRUE);
}
else
{
gtk_box_reorder_child_after (GTK_BOX (priv->box), priv->scale,
priv->minus_button);
gtk_box_reorder_child_after (GTK_BOX (priv->box), priv->plus_button,
priv->scale);
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 = gtk_scale_button_get_instance_private (button);
if (priv->orientation != orientation)
{
priv->orientation = orientation;
apply_orientation (button, priv->orientation);
g_object_notify (G_OBJECT (button), "orientation");
}
}
static gboolean
gtk_scale_button_scroll_controller_scroll (GtkEventControllerScroll *scroll,
double dx,
double dy,
GtkScaleButton *button)
{
GtkScaleButtonPrivate *priv = gtk_scale_button_get_instance_private (button);
GtkAdjustment *adjustment;
double 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);
apply_orientation (button, priv->orientation);
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;
double 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;
double value;
const char *name;
guint num_icons;
if (!priv->icon_list || !priv->icon_list[0] || 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)
{
double 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
{
double 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);
double value;
double 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");
gtk_accessible_update_property (GTK_ACCESSIBLE (button),
GTK_ACCESSIBLE_PROPERTY_VALUE_NOW, value,
-1);
}
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_popover_present (GTK_POPOVER (priv->dock));
}