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Learning_GTK4_tree/gtk/gtkwindowhandle.c

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/*
* Copyright (c) 2020 Alexander Mikhaylenko <alexm@gnome.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#include "gtkwindowhandle.h"
#include "gtkbinlayout.h"
#include "gtkbox.h"
#include "gtkbuildable.h"
#include "gtkdragsourceprivate.h"
#include "gtkgestureclick.h"
#include "gtkgesturedrag.h"
#include "gtkgestureprivate.h"
#include <glib/gi18n-lib.h>
#include "gtkmodelbuttonprivate.h"
#include "gtknative.h"
#include "gtkpopovermenuprivate.h"
#include "gtkprivate.h"
#include "gtkseparator.h"
#include "gtkwidgetprivate.h"
/**
* GtkWindowHandle:
*
* `GtkWindowHandle` is a titlebar area widget.
*
* When added into a window, it can be dragged to move the window, and handles
* right click, double click and middle click as expected of a titlebar.
*
* # CSS nodes
*
* `GtkWindowHandle` has a single CSS node with the name `windowhandle`.
*
* # Accessibility
*
* Until GTK 4.10, `GtkWindowHandle` used the `GTK_ACCESSIBLE_ROLE_GROUP` role.
*
* Starting from GTK 4.12, `GtkWindowHandle` uses the `GTK_ACCESSIBLE_ROLE_GENERIC` role.
*/
struct _GtkWindowHandle {
GtkWidget parent_instance;
GtkGesture *click_gesture;
GtkGesture *drag_gesture;
GtkWidget *child;
GtkWidget *fallback_menu;
};
enum {
PROP_0,
PROP_CHILD,
LAST_PROP
};
static GParamSpec *props[LAST_PROP] = { NULL, };
static void gtk_window_handle_buildable_iface_init (GtkBuildableIface *iface);
G_DEFINE_TYPE_WITH_CODE (GtkWindowHandle, gtk_window_handle, GTK_TYPE_WIDGET,
G_IMPLEMENT_INTERFACE (GTK_TYPE_BUILDABLE, gtk_window_handle_buildable_iface_init))
static void
lower_window (GtkWindowHandle *self)
{
GdkSurface *surface =
gtk_native_get_surface (gtk_widget_get_native (GTK_WIDGET (self)));
gdk_toplevel_lower (GDK_TOPLEVEL (surface));
}
static GtkWindow *
get_window (GtkWindowHandle *self)
{
GtkRoot *root = gtk_widget_get_root (GTK_WIDGET (self));
if (GTK_IS_WINDOW (root))
return GTK_WINDOW (root);
return NULL;
}
static void
restore_window_clicked (GtkModelButton *button,
GtkWindowHandle *self)
{
GtkWindow *window = get_window (self);
if (!window)
return;
if (gtk_window_is_maximized (window))
gtk_window_unmaximize (window);
}
static void
minimize_window_clicked (GtkModelButton *button,
GtkWindowHandle *self)
{
GtkWindow *window = get_window (self);
if (!window)
return;
/* Turns out, we can't minimize a maximized window */
if (gtk_window_is_maximized (window))
gtk_window_unmaximize (window);
gtk_window_minimize (window);
}
static void
maximize_window_clicked (GtkModelButton *button,
GtkWindowHandle *self)
{
GtkWindow *window = get_window (self);
if (window)
gtk_window_maximize (window);
}
static void
close_window_clicked (GtkModelButton *button,
GtkWindowHandle *self)
{
GtkWindow *window = get_window (self);
if (window)
gtk_window_close (window);
}
static void
popup_menu_closed (GtkPopover *popover,
GtkWindowHandle *self)
{
g_clear_pointer (&self->fallback_menu, gtk_widget_unparent);
}
static void
do_popup_fallback (GtkWindowHandle *self,
GdkEvent *event)
{
GdkRectangle rect = { 0, 0, 1, 1 };
GdkDevice *device;
GdkSeat *seat;
GtkWidget *box, *menuitem;
GtkWindow *window;
gboolean maximized, resizable, deletable;
g_clear_pointer (&self->fallback_menu, gtk_widget_unparent);
window = get_window (self);
if (window)
{
maximized = gtk_window_is_maximized (window);
resizable = gtk_window_get_resizable (window);
deletable = gtk_window_get_deletable (window);
}
else
{
maximized = FALSE;
resizable = FALSE;
deletable = FALSE;
}
self->fallback_menu = gtk_popover_menu_new ();
gtk_widget_set_parent (self->fallback_menu, GTK_WIDGET (self));
gtk_popover_set_has_arrow (GTK_POPOVER (self->fallback_menu), FALSE);
gtk_widget_set_halign (self->fallback_menu, GTK_ALIGN_START);
device = gdk_event_get_device (event);
seat = gdk_event_get_seat (event);
if (device == gdk_seat_get_keyboard (seat))
device = gdk_seat_get_pointer (seat);
if (device)
{
GtkNative *native;
GdkSurface *surface;
double px, py;
double nx, ny;
graphene_point_t p;
native = gtk_widget_get_native (GTK_WIDGET (self));
surface = gtk_native_get_surface (native);
gdk_surface_get_device_position (surface, device, &px, &py, NULL);
gtk_native_get_surface_transform (native, &nx, &ny);
if (!gtk_widget_compute_point (GTK_WIDGET (gtk_widget_get_native (GTK_WIDGET (self))),
GTK_WIDGET (self),
&GRAPHENE_POINT_INIT (px - nx, py - ny),
&p))
graphene_point_init (&p, 0, 0);
rect.x = p.x;
rect.y = p.y;
}
gtk_popover_set_pointing_to (GTK_POPOVER (self->fallback_menu), &rect);
box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
gtk_popover_menu_add_submenu (GTK_POPOVER_MENU (self->fallback_menu), box, "main");
menuitem = gtk_model_button_new ();
g_object_set (menuitem, "text", _("Restore"), NULL);
gtk_widget_set_sensitive (menuitem, maximized && resizable);
g_signal_connect (G_OBJECT (menuitem), "clicked",
G_CALLBACK (restore_window_clicked), self);
gtk_box_append (GTK_BOX (box), menuitem);
menuitem = gtk_model_button_new ();
g_object_set (menuitem, "text", _("Minimize"), NULL);
g_signal_connect (G_OBJECT (menuitem), "clicked",
G_CALLBACK (minimize_window_clicked), self);
gtk_box_append (GTK_BOX (box), menuitem);
menuitem = gtk_model_button_new ();
g_object_set (menuitem, "text", _("Maximize"), NULL);
gtk_widget_set_sensitive (menuitem, resizable && !maximized);
g_signal_connect (G_OBJECT (menuitem), "clicked",
G_CALLBACK (maximize_window_clicked), self);
gtk_box_append (GTK_BOX (box), menuitem);
menuitem = gtk_separator_new (GTK_ORIENTATION_HORIZONTAL);
gtk_box_append (GTK_BOX (box), menuitem);
menuitem = gtk_model_button_new ();
g_object_set (menuitem, "text", _("Close"), NULL);
gtk_widget_set_sensitive (menuitem, deletable);
g_signal_connect (G_OBJECT (menuitem), "clicked",
G_CALLBACK (close_window_clicked), self);
gtk_box_append (GTK_BOX (box), menuitem);
g_signal_connect (self->fallback_menu, "closed",
G_CALLBACK (popup_menu_closed), self);
gtk_popover_popup (GTK_POPOVER (self->fallback_menu));
}
static void
do_popup (GtkWindowHandle *self,
GtkGestureClick *gesture)
{
GdkSurface *surface =
gtk_native_get_surface (gtk_widget_get_native (GTK_WIDGET (self)));
GdkEventSequence *sequence;
GdkEvent *event;
sequence = gtk_gesture_single_get_current_sequence (GTK_GESTURE_SINGLE (gesture));
event = gtk_gesture_get_last_event (GTK_GESTURE (gesture), sequence);
if (!event)
return;
if (!gdk_toplevel_show_window_menu (GDK_TOPLEVEL (surface), event))
do_popup_fallback (self, event);
}
static gboolean
perform_titlebar_action_fallback (GtkWindowHandle *self,
GtkGestureClick *click_gesture,
GdkTitlebarGesture gesture)
{
GtkSettings *settings;
char *action = NULL;
gboolean retval = TRUE;
settings = gtk_widget_get_settings (GTK_WIDGET (self));
switch (gesture)
{
case GDK_TITLEBAR_GESTURE_DOUBLE_CLICK:
g_object_get (settings, "gtk-titlebar-double-click", &action, NULL);
break;
case GDK_TITLEBAR_GESTURE_MIDDLE_CLICK:
g_object_get (settings, "gtk-titlebar-middle-click", &action, NULL);
break;
case GDK_TITLEBAR_GESTURE_RIGHT_CLICK:
g_object_get (settings, "gtk-titlebar-right-click", &action, NULL);
break;
default:
break;
}
if (action == NULL)
retval = FALSE;
else if (g_str_equal (action, "none"))
retval = FALSE;
/* treat all maximization variants the same */
else if (g_str_has_prefix (action, "toggle-maximize"))
gtk_widget_activate_action (GTK_WIDGET (self),
"window.toggle-maximized",
NULL);
else if (g_str_equal (action, "lower"))
lower_window (self);
else if (g_str_equal (action, "minimize"))
gtk_widget_activate_action (GTK_WIDGET (self),
"window.minimize",
NULL);
else if (g_str_equal (action, "menu"))
do_popup (self, click_gesture);
else
{
g_warning ("Unsupported titlebar action %s", action);
retval = FALSE;
}
g_free (action);
return retval;
}
static gboolean
perform_titlebar_action (GtkWindowHandle *self,
GtkGestureClick *click_gesture,
guint button,
int n_press)
{
GdkSurface *surface =
gtk_native_get_surface (gtk_widget_get_native (GTK_WIDGET (self)));
GdkTitlebarGesture gesture;
switch (button)
{
case GDK_BUTTON_PRIMARY:
if (n_press == 2)
gesture = GDK_TITLEBAR_GESTURE_DOUBLE_CLICK;
else
return FALSE;
break;
case GDK_BUTTON_MIDDLE:
gesture = GDK_TITLEBAR_GESTURE_MIDDLE_CLICK;
break;
case GDK_BUTTON_SECONDARY:
gesture = GDK_TITLEBAR_GESTURE_RIGHT_CLICK;
break;
default:
return FALSE;
}
if (gdk_toplevel_titlebar_gesture (GDK_TOPLEVEL (surface), gesture))
return TRUE;
return perform_titlebar_action_fallback (self, click_gesture, gesture);
}
static void
click_gesture_pressed_cb (GtkGestureClick *gesture,
int n_press,
double x,
double y,
GtkWindowHandle *self)
{
GtkWidget *widget;
guint button;
widget = GTK_WIDGET (self);
button = gtk_gesture_single_get_current_button (GTK_GESTURE_SINGLE (gesture));
if (n_press > 1)
gtk_gesture_set_state (self->drag_gesture, GTK_EVENT_SEQUENCE_DENIED);
if (gdk_display_device_is_grabbed (gtk_widget_get_display (widget),
gtk_gesture_get_device (GTK_GESTURE (gesture))))
{
gtk_gesture_set_state (self->drag_gesture, GTK_EVENT_SEQUENCE_DENIED);
return;
}
switch (button)
{
case GDK_BUTTON_PRIMARY:
if (n_press == 2)
{
perform_titlebar_action (self, gesture, button, n_press);
gtk_gesture_set_state (GTK_GESTURE (gesture),
GTK_EVENT_SEQUENCE_CLAIMED);
}
break;
case GDK_BUTTON_SECONDARY:
if (perform_titlebar_action (self, gesture, button, n_press))
gtk_gesture_set_state (GTK_GESTURE (gesture),
GTK_EVENT_SEQUENCE_CLAIMED);
gtk_event_controller_reset (GTK_EVENT_CONTROLLER (gesture));
gtk_event_controller_reset (GTK_EVENT_CONTROLLER (self->drag_gesture));
break;
case GDK_BUTTON_MIDDLE:
if (perform_titlebar_action (self, gesture, button, n_press))
gtk_gesture_set_state (GTK_GESTURE (gesture),
GTK_EVENT_SEQUENCE_CLAIMED);
break;
default:
return;
}
}
static void
drag_gesture_update_cb (GtkGestureDrag *gesture,
double offset_x,
double offset_y,
GtkWindowHandle *self)
{
if (gtk_drag_check_threshold_double (GTK_WIDGET (self), 0, 0, offset_x, offset_y))
{
double start_x, start_y;
double native_x, native_y;
graphene_point_t p;
GtkNative *native;
GdkSurface *surface;
gtk_gesture_set_state (GTK_GESTURE (gesture), GTK_EVENT_SEQUENCE_CLAIMED);
gtk_gesture_drag_get_start_point (gesture, &start_x, &start_y);
native = gtk_widget_get_native (GTK_WIDGET (self));
if (!gtk_widget_compute_point (GTK_WIDGET (self),
GTK_WIDGET (native),
&GRAPHENE_POINT_INIT (start_x, start_y),
&p))
graphene_point_init (&p, start_x, start_y);
gtk_native_get_surface_transform (native, &native_x, &native_y);
p.x += native_x;
p.y += native_y;
surface = gtk_native_get_surface (native);
if (GDK_IS_TOPLEVEL (surface))
gdk_toplevel_begin_move (GDK_TOPLEVEL (surface),
gtk_gesture_get_device (GTK_GESTURE (gesture)),
gtk_gesture_single_get_current_button (GTK_GESTURE_SINGLE (gesture)),
p.x, p.y,
gtk_event_controller_get_current_event_time (GTK_EVENT_CONTROLLER (gesture)));
gtk_event_controller_reset (GTK_EVENT_CONTROLLER (gesture));
gtk_event_controller_reset (GTK_EVENT_CONTROLLER (self->click_gesture));
}
}
static void
gtk_window_handle_unrealize (GtkWidget *widget)
{
GtkWindowHandle *self = GTK_WINDOW_HANDLE (widget);
g_clear_pointer (&self->fallback_menu, gtk_widget_unparent);
GTK_WIDGET_CLASS (gtk_window_handle_parent_class)->unrealize (widget);
}
static void
gtk_window_handle_dispose (GObject *object)
{
GtkWindowHandle *self = GTK_WINDOW_HANDLE (object);
g_clear_pointer (&self->child, gtk_widget_unparent);
G_OBJECT_CLASS (gtk_window_handle_parent_class)->dispose (object);
}
static void
gtk_window_handle_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GtkWindowHandle *self = GTK_WINDOW_HANDLE (object);
switch (prop_id)
{
case PROP_CHILD:
g_value_set_object (value, gtk_window_handle_get_child (self));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gtk_window_handle_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GtkWindowHandle *self = GTK_WINDOW_HANDLE (object);
switch (prop_id)
{
case PROP_CHILD:
gtk_window_handle_set_child (self, g_value_get_object (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gtk_window_handle_class_init (GtkWindowHandleClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
object_class->dispose = gtk_window_handle_dispose;
object_class->get_property = gtk_window_handle_get_property;
object_class->set_property = gtk_window_handle_set_property;
widget_class->unrealize = gtk_window_handle_unrealize;
/**
* GtkWindowHandle:child: (attributes org.gtk.Property.get=gtk_window_handle_get_child org.gtk.Property.set=gtk_window_handle_set_child)
*
* The child widget.
*/
props[PROP_CHILD] =
g_param_spec_object ("child", NULL, NULL,
GTK_TYPE_WIDGET,
GTK_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY);
g_object_class_install_properties (object_class, LAST_PROP, props);
gtk_widget_class_set_layout_manager_type (widget_class, GTK_TYPE_BIN_LAYOUT);
gtk_widget_class_set_css_name (widget_class, I_("windowhandle"));
gtk_widget_class_set_accessible_role (widget_class, GTK_ACCESSIBLE_ROLE_GENERIC);
}
static void
gtk_window_handle_init (GtkWindowHandle *self)
{
self->click_gesture = gtk_gesture_click_new ();
gtk_gesture_single_set_button (GTK_GESTURE_SINGLE (self->click_gesture), 0);
g_signal_connect (self->click_gesture, "pressed",
G_CALLBACK (click_gesture_pressed_cb), self);
gtk_widget_add_controller (GTK_WIDGET (self), GTK_EVENT_CONTROLLER (self->click_gesture));
self->drag_gesture = gtk_gesture_drag_new ();
g_signal_connect (self->drag_gesture, "drag-update",
G_CALLBACK (drag_gesture_update_cb), self);
gtk_widget_add_controller (GTK_WIDGET (self), GTK_EVENT_CONTROLLER (self->drag_gesture));
}
static GtkBuildableIface *parent_buildable_iface;
static void
gtk_window_handle_buildable_add_child (GtkBuildable *buildable,
GtkBuilder *builder,
GObject *child,
const char *type)
{
if (GTK_IS_WIDGET (child))
gtk_window_handle_set_child (GTK_WINDOW_HANDLE (buildable), GTK_WIDGET (child));
else
parent_buildable_iface->add_child (buildable, builder, child, type);
}
static void
gtk_window_handle_buildable_iface_init (GtkBuildableIface *iface)
{
parent_buildable_iface = g_type_interface_peek_parent (iface);
iface->add_child = gtk_window_handle_buildable_add_child;
}
/**
* gtk_window_handle_new:
*
* Creates a new `GtkWindowHandle`.
*
* Returns: a new `GtkWindowHandle`.
*/
GtkWidget *
gtk_window_handle_new (void)
{
return g_object_new (GTK_TYPE_WINDOW_HANDLE, NULL);
}
/**
* gtk_window_handle_get_child: (attributes org.gtk.Method.get_property=child)
* @self: a `GtkWindowHandle`
*
* Gets the child widget of @self.
*
* Returns: (nullable) (transfer none): the child widget of @self
*/
GtkWidget *
gtk_window_handle_get_child (GtkWindowHandle *self)
{
g_return_val_if_fail (GTK_IS_WINDOW_HANDLE (self), NULL);
return self->child;
}
/**
* gtk_window_handle_set_child: (attributes org.gtk.Method.set_property=child)
* @self: a `GtkWindowHandle`
* @child: (nullable): the child widget
*
* Sets the child widget of @self.
*/
void
gtk_window_handle_set_child (GtkWindowHandle *self,
GtkWidget *child)
{
g_return_if_fail (GTK_IS_WINDOW_HANDLE (self));
g_return_if_fail (child == NULL || self->child == child || gtk_widget_get_parent (child) == NULL);
if (self->child == child)
return;
g_clear_pointer (&self->child, gtk_widget_unparent);
self->child = child;
if (child)
gtk_widget_set_parent (child, GTK_WIDGET (self));
g_object_notify_by_pspec (G_OBJECT (self), props[PROP_CHILD]);
}
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