gtk2/gtk/gtkdragicon.c
Matthias Clasen 10e4c04e61 Use style values directly
Replace uses of gtk_css_style_get_value with direct access,
throughout the tree. We don't replace all uses, just those
where we are dealing with a fixed property. Be careful to
handle the currentColor special case for color properties.
2020-01-29 11:07:32 +01:00

475 lines
12 KiB
C

/* GTK - The GIMP Toolkit
* Copyright 2019 Matthias Clasen
*
* 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/>.
*/
#include "config.h"
#include "gtkdragiconprivate.h"
#include "gtkprivate.h"
#include "gtkintl.h"
#include "gtkwidgetprivate.h"
#include "gtkcssstyleprivate.h"
#include "gtkcssnodeprivate.h"
#include "gtkcsstypesprivate.h"
#include "gtknativeprivate.h"
#include "gtkpicture.h"
#include "gtkcssnumbervalueprivate.h"
/**
* SECTION:gtkdragicon
* @Short_description: A toplevel to use as drag icon
* @Title: GtkDragIcon
*
* GtkDragIcon is a #GtkNative implementation with the sole purpose
* to serve as a drag icon during DND operations. A drag icon moves
* with the pointer during a drag operation and is destroyed when
* the drag ends.
*
* To set up a drag icon and associate it with an ongoing drag operation,
* use gtk_drag_icon_set_from_paintable(). It is also possible to create
* a GtkDragIcon with gtk_drag_icon_new_for_drag(() and populate it
* with widgets yourself.
*/
struct _GtkDragIcon
{
GtkWidget parent_instance;
GdkSurface *surface;
GskRenderer *renderer;
GtkWidget *widget;
};
struct _GtkDragIconClass
{
GtkWidgetClass parent_class;
};
enum {
LAST_ARG = 1
};
static void gtk_drag_icon_root_init (GtkRootInterface *iface);
static void gtk_drag_icon_native_init (GtkNativeInterface *iface);
G_DEFINE_TYPE_WITH_CODE (GtkDragIcon, gtk_drag_icon, GTK_TYPE_CONTAINER,
G_IMPLEMENT_INTERFACE (GTK_TYPE_NATIVE,
gtk_drag_icon_native_init)
G_IMPLEMENT_INTERFACE (GTK_TYPE_ROOT,
gtk_drag_icon_root_init))
static GdkDisplay *
gtk_drag_icon_root_get_display (GtkRoot *self)
{
GtkDragIcon *icon = GTK_DRAG_ICON (self);
if (icon->surface)
return gdk_surface_get_display (icon->surface);
return gdk_display_get_default ();
}
static void
gtk_drag_icon_root_init (GtkRootInterface *iface)
{
iface->get_display = gtk_drag_icon_root_get_display;
}
static GdkSurface *
gtk_drag_icon_native_get_surface (GtkNative *native)
{
GtkDragIcon *icon = GTK_DRAG_ICON (native);
return icon->surface;
}
static GskRenderer *
gtk_drag_icon_native_get_renderer (GtkNative *native)
{
GtkDragIcon *icon = GTK_DRAG_ICON (native);
return icon->renderer;
}
static void
gtk_drag_icon_native_get_surface_transform (GtkNative *native,
int *x,
int *y)
{
GtkCssStyle *style;
style = gtk_css_node_get_style (gtk_widget_get_css_node (GTK_WIDGET (native)));
*x = _gtk_css_number_value_get (style->size->margin_left, 100) +
_gtk_css_number_value_get (style->border->border_left_width, 100) +
_gtk_css_number_value_get (style->size->padding_left, 100);
*y = _gtk_css_number_value_get (style->size->margin_top, 100) +
_gtk_css_number_value_get (style->border->border_top_width, 100) +
_gtk_css_number_value_get (style->size->padding_top, 100);
}
static void
gtk_drag_icon_move_resize (GtkDragIcon *icon)
{
GtkRequisition req;
if (icon->surface)
{
gtk_widget_get_preferred_size (GTK_WIDGET (icon), NULL, &req);
gdk_surface_resize (icon->surface, req.width, req.height);
}
}
static void
gtk_drag_icon_native_check_resize (GtkNative *native)
{
GtkDragIcon *icon = GTK_DRAG_ICON (native);
GtkWidget *widget = GTK_WIDGET (native);
if (!_gtk_widget_get_alloc_needed (widget))
gtk_widget_ensure_allocate (widget);
else if (gtk_widget_get_visible (widget))
{
gtk_drag_icon_move_resize (icon);
if (icon->surface)
gtk_widget_allocate (widget,
gdk_surface_get_width (icon->surface),
gdk_surface_get_height (icon->surface),
-1, NULL);
}
}
static void
gtk_drag_icon_native_init (GtkNativeInterface *iface)
{
iface->get_surface = gtk_drag_icon_native_get_surface;
iface->get_renderer = gtk_drag_icon_native_get_renderer;
iface->get_surface_transform = gtk_drag_icon_native_get_surface_transform;
iface->check_resize = gtk_drag_icon_native_check_resize;
}
static gboolean
surface_render (GdkSurface *surface,
cairo_region_t *region,
GtkWidget *widget)
{
gtk_widget_render (widget, surface, region);
return TRUE;
}
static void
gtk_drag_icon_realize (GtkWidget *widget)
{
GtkDragIcon *icon = GTK_DRAG_ICON (widget);
g_warn_if_fail (icon->surface != NULL);
gdk_surface_set_widget (icon->surface, widget);
g_signal_connect (icon->surface, "render", G_CALLBACK (surface_render), widget);
GTK_WIDGET_CLASS (gtk_drag_icon_parent_class)->realize (widget);
icon->renderer = gsk_renderer_new_for_surface (icon->surface);
}
static void
gtk_drag_icon_unrealize (GtkWidget *widget)
{
GtkDragIcon *icon = GTK_DRAG_ICON (widget);
GTK_WIDGET_CLASS (gtk_drag_icon_parent_class)->unrealize (widget);
gsk_renderer_unrealize (icon->renderer);
g_clear_object (&icon->renderer);
if (icon->surface)
{
g_signal_handlers_disconnect_by_func (icon->surface, surface_render, widget);
gdk_surface_set_widget (icon->surface, NULL);
}
}
static void
gtk_drag_icon_map (GtkWidget *widget)
{
GtkDragIcon *icon = GTK_DRAG_ICON (widget);
gdk_surface_show (icon->surface);
GTK_WIDGET_CLASS (gtk_drag_icon_parent_class)->map (widget);
if (icon->widget && gtk_widget_get_visible (icon->widget))
gtk_widget_map (icon->widget);
}
static void
gtk_drag_icon_unmap (GtkWidget *widget)
{
GtkDragIcon *icon = GTK_DRAG_ICON (widget);
g_warn_if_fail (icon->surface != NULL);
GTK_WIDGET_CLASS (gtk_drag_icon_parent_class)->unmap (widget);
if (icon->surface)
gdk_surface_hide (icon->surface);
if (icon->widget)
gtk_widget_unmap (icon->widget);
}
static void
gtk_drag_icon_measure (GtkWidget *widget,
GtkOrientation orientation,
int for_size,
int *minimum,
int *natural,
int *minimum_baseline,
int *natural_baseline)
{
GtkDragIcon *icon = GTK_DRAG_ICON (widget);
if (icon->widget)
gtk_widget_measure (icon->widget,
orientation, for_size,
minimum, natural,
minimum_baseline, natural_baseline);
}
static void
gtk_drag_icon_size_allocate (GtkWidget *widget,
int width,
int height,
int baseline)
{
GtkDragIcon *icon = GTK_DRAG_ICON (widget);
gtk_drag_icon_move_resize (icon);
if (icon->widget)
gtk_widget_allocate (icon->widget, width, height, baseline, NULL);
}
static void
gtk_drag_icon_show (GtkWidget *widget)
{
_gtk_widget_set_visible_flag (widget, TRUE);
gtk_css_node_validate (gtk_widget_get_css_node (widget));
gtk_widget_realize (widget);
gtk_drag_icon_native_check_resize (GTK_NATIVE (widget));
gtk_widget_map (widget);
}
static void
gtk_drag_icon_hide (GtkWidget *widget)
{
_gtk_widget_set_visible_flag (widget, FALSE);
gtk_widget_unmap (widget);
}
static void
gtk_drag_icon_dispose (GObject *object)
{
GtkDragIcon *icon = GTK_DRAG_ICON (object);
g_clear_pointer (&icon->widget, gtk_widget_unparent);
G_OBJECT_CLASS (gtk_drag_icon_parent_class)->dispose (object);
g_clear_object (&icon->surface);
}
static void
gtk_drag_icon_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
switch (prop_id)
{
case LAST_ARG + GTK_ROOT_PROP_FOCUS_WIDGET:
g_value_set_object (value, NULL);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gtk_drag_icon_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
switch (prop_id)
{
case LAST_ARG + GTK_ROOT_PROP_FOCUS_WIDGET:
// do nothing
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gtk_drag_icon_add (GtkContainer *self,
GtkWidget *widget)
{
GtkDragIcon *icon = GTK_DRAG_ICON (self);
if (icon->widget)
{
g_warning ("GtkDragIcon already has a child");
return;
}
gtk_widget_set_parent (widget, GTK_WIDGET (icon));
icon->widget = widget;
}
static void
gtk_drag_icon_remove (GtkContainer *self,
GtkWidget *widget)
{
GtkDragIcon *icon = GTK_DRAG_ICON (self);
if (icon->widget == widget)
{
gtk_widget_unparent (widget);
icon->widget = NULL;
}
}
static void
gtk_drag_icon_class_init (GtkDragIconClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
GtkContainerClass *container_class = GTK_CONTAINER_CLASS (klass);
object_class->dispose = gtk_drag_icon_dispose;
object_class->get_property = gtk_drag_icon_get_property;
object_class->set_property = gtk_drag_icon_set_property;
widget_class->realize = gtk_drag_icon_realize;
widget_class->unrealize = gtk_drag_icon_unrealize;
widget_class->map = gtk_drag_icon_map;
widget_class->unmap = gtk_drag_icon_unmap;
widget_class->measure = gtk_drag_icon_measure;
widget_class->size_allocate = gtk_drag_icon_size_allocate;
widget_class->show = gtk_drag_icon_show;
widget_class->hide = gtk_drag_icon_hide;
container_class->add = gtk_drag_icon_add;
container_class->remove = gtk_drag_icon_remove;
gtk_root_install_properties (object_class, LAST_ARG);
gtk_widget_class_set_css_name (widget_class, "dnd");
}
static void
gtk_drag_icon_init (GtkDragIcon *self)
{
}
GtkWidget *
gtk_drag_icon_new (void)
{
return g_object_new (GTK_TYPE_DRAG_ICON, NULL);
}
/**
* gtk_drag_icon_new_for_drag:
* @drag: a #GtkDrag
*
* Creates a #GtkDragIcon and associates it with the drag operation.
*
* Returns: the new #GtkDragIcon
*/
GtkWidget *
gtk_drag_icon_new_for_drag (GdkDrag *drag)
{
GtkWidget *icon;
g_return_val_if_fail (GDK_IS_DRAG (drag), NULL);
icon = g_object_new (GTK_TYPE_DRAG_ICON, NULL);
gtk_drag_icon_set_surface (GTK_DRAG_ICON (icon), gdk_drag_get_drag_surface (drag));
return icon;
}
/**
* gtk_drag_icon_set_from_paintable:
* @drag: a #GdkDrag
* @paintable: a #GdkPaintable to display
* @hot_x: X coordinate of the hotspot
* @hot_y: Y coordinate of the hotspot
*
* Creates a #GtkDragIcon that shows @paintable, and associates
* it with the drag operation. The hotspot position on the paintable
* is aligned with the hotspot of the cursor.
*/
void
gtk_drag_icon_set_from_paintable (GdkDrag *drag,
GdkPaintable *paintable,
int hot_x,
int hot_y)
{
GtkWidget *icon;
GtkWidget *picture;
gdk_drag_set_hotspot (drag, hot_x, hot_y);
icon = gtk_drag_icon_new_for_drag (drag);
picture = gtk_picture_new_for_paintable (paintable);
gtk_picture_set_can_shrink (GTK_PICTURE (picture), FALSE);
gtk_container_add (GTK_CONTAINER (icon), picture);
g_object_set_data_full (G_OBJECT (drag),
"icon",
g_object_ref_sink (icon),
(GDestroyNotify)gtk_widget_destroy);
gtk_widget_show (icon);
}
void
gtk_drag_icon_set_surface (GtkDragIcon *icon,
GdkSurface *surface)
{
g_set_object (&icon->surface, surface);
}
void
gtk_drag_icon_set_widget (GtkDragIcon *icon,
GtkWidget *widget)
{
if (icon->widget == widget)
return;
if (icon->widget)
gtk_widget_unparent (icon->widget);
icon->widget = widget;
if (icon->widget)
gtk_widget_set_parent (icon->widget, GTK_WIDGET (icon));
}