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gtk2/gtk/gtkcolorswatch.c
Benjamin Otte a411959c91 droptarget: Redo 
This is a huge reorganization of GtkDropTarget. I did not know how to
split this up, so it's unfortunately all one commit.

Highlights:

- Split GtkDropTarget into GtkDropTarget and GtkDropTargetAsync
  GtkDropTarget is the simple one that only works with GTypes and offers
  a synchronous interface.
  GtkDropTargetAsync retains the full old functionality and allows
  handling mime types.

- Drop events are handled differently
  Instead of picking a single drop target and sending all DND events to
  it, every event is sent to every drop target. The first one to handle
  the event gets to call gdk_drop_status(), further handlers do not
  interact with the GdkDrop.
  Of course, for the ultimate GDK_DROP_STARTING event, only the first
  one to accept the drop gets to handle it.
  This allows stacking DND event controllers that aren't necessarily
  interested in handling the event or that might decide later to drop
  it.

- Port all widgets to either of those
  Both have a somewhat changed API due to the new event handling.
  For the ones who should use the sync version, lots of cleanup was
  involved to operate on a sync API.
2020-03-02 03:18:55 +01:00

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/* GTK - The GIMP Toolkit
* Copyright (C) 2012 Red Hat, Inc.
*
* 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 "gtkcolorswatchprivate.h"
#include "gtkbox.h"
#include "gtkcolorchooserprivate.h"
#include "gtkcssnodeprivate.h"
#include "gtkdragsource.h"
#include "gtkdroptarget.h"
#include "gtkgesturelongpress.h"
#include "gtkgestureclick.h"
#include "gtkgesturesingle.h"
#include "gtkicontheme.h"
#include "gtkimage.h"
#include "gtkintl.h"
#include "gtkmain.h"
#include "gtkmodelbuttonprivate.h"
#include "gtkpopovermenu.h"
#include "gtkprivate.h"
#include "gtksnapshot.h"
#include "gtkstylecontextprivate.h"
#include "gtkwidgetprivate.h"
#include "gtkeventcontrollerkey.h"
#include "gtknative.h"
#include "gtkdragsource.h"
#include "a11y/gtkcolorswatchaccessibleprivate.h"
/*
* GtkColorSwatch has two CSS nodes, the main one named colorswatch
* and a subnode named overlay. The main node gets the .light or .dark
* style classes added depending on the brightness of the color that
* the swatch is showing.
*
* The color swatch has the .activatable style class by default. It can
* be removed for non-activatable swatches.
*/
typedef struct
{
GdkRGBA color;
gdouble radius[4];
gchar *icon;
guint has_color : 1;
guint use_alpha : 1;
guint selectable : 1;
guint has_menu : 1;
GtkWidget *overlay_widget;
GtkWidget *popover;
GtkDropTarget *dest;
} GtkColorSwatchPrivate;
enum
{
PROP_ZERO,
PROP_RGBA,
PROP_SELECTABLE,
PROP_HAS_MENU,
PROP_CAN_DROP
};
G_DEFINE_TYPE_WITH_PRIVATE (GtkColorSwatch, gtk_color_swatch, GTK_TYPE_WIDGET)
#define INTENSITY(r, g, b) ((r) * 0.30 + (g) * 0.59 + (b) * 0.11)
static void
swatch_snapshot (GtkWidget *widget,
GtkSnapshot *snapshot)
{
GtkColorSwatch *swatch = GTK_COLOR_SWATCH (widget);
GtkColorSwatchPrivate *priv = gtk_color_swatch_get_instance_private (swatch);
const int width = gtk_widget_get_width (widget);
const int height = gtk_widget_get_height (widget);
if (priv->has_color)
{
if (priv->use_alpha && !gdk_rgba_is_opaque (&priv->color))
{
_gtk_color_chooser_snapshot_checkered_pattern (snapshot, width, height);
gtk_snapshot_append_color (snapshot,
&priv->color,
&GRAPHENE_RECT_INIT (0, 0, width, height));
}
else
{
GdkRGBA color = priv->color;
color.alpha = 1.0;
gtk_snapshot_append_color (snapshot,
&color,
&GRAPHENE_RECT_INIT (0, 0, width, height));
}
}
gtk_widget_snapshot_child (widget, priv->overlay_widget, snapshot);
}
static void
gtk_color_swatch_drag_begin (GtkDragSource *source,
GdkDrag *drag,
GtkColorSwatch *swatch)
{
GtkColorSwatchPrivate *priv = gtk_color_swatch_get_instance_private (swatch);
GtkSnapshot *snapshot;
GdkPaintable *paintable;
snapshot = gtk_snapshot_new ();
gtk_snapshot_append_color (snapshot, &priv->color, &GRAPHENE_RECT_INIT(0, 0, 48, 32));
paintable = gtk_snapshot_free_to_paintable (snapshot, NULL);
gtk_drag_source_set_icon (source, paintable, 0, 0);
g_object_unref (paintable);
}
static gboolean
swatch_drag_drop (GtkDropTarget *dest,
const GValue *value,
double x,
double y,
GtkColorSwatch *swatch)
{
gtk_color_swatch_set_rgba (swatch, g_value_get_boxed (value));
return TRUE;
}
static void
activate_color (GtkColorSwatch *swatch)
{
GtkColorSwatchPrivate *priv = gtk_color_swatch_get_instance_private (swatch);
double red, green, blue, alpha;
red = priv->color.red;
green = priv->color.green;
blue = priv->color.blue;
alpha = priv->color.alpha;
gtk_widget_activate_action (GTK_WIDGET (swatch),
"color.select", "(dddd)", red, green, blue, alpha);
}
static void
customize_color (GtkColorSwatch *swatch)
{
GtkColorSwatchPrivate *priv = gtk_color_swatch_get_instance_private (swatch);
double red, green, blue, alpha;
red = priv->color.red;
green = priv->color.green;
blue = priv->color.blue;
alpha = priv->color.alpha;
gtk_widget_activate_action (GTK_WIDGET (swatch),
"color.customize", "(dddd)", red, green, blue, alpha);
}
static gboolean
key_controller_key_pressed (GtkEventControllerKey *controller,
guint keyval,
guint keycode,
GdkModifierType state,
GtkWidget *widget)
{
GtkColorSwatch *swatch = GTK_COLOR_SWATCH (widget);
GtkColorSwatchPrivate *priv = gtk_color_swatch_get_instance_private (swatch);
if (keyval == GDK_KEY_space ||
keyval == GDK_KEY_Return ||
keyval == GDK_KEY_ISO_Enter||
keyval == GDK_KEY_KP_Enter ||
keyval == GDK_KEY_KP_Space)
{
if (priv->has_color &&
priv->selectable &&
(gtk_widget_get_state_flags (widget) & GTK_STATE_FLAG_SELECTED) == 0)
gtk_widget_set_state_flags (widget, GTK_STATE_FLAG_SELECTED, FALSE);
else
customize_color (swatch);
return TRUE;
}
return FALSE;
}
static GMenuModel *
gtk_color_swatch_get_menu_model (GtkColorSwatch *swatch)
{
GtkColorSwatchPrivate *priv = gtk_color_swatch_get_instance_private (swatch);
GMenu *menu, *section;
GMenuItem *item;
double red, green, blue, alpha;
menu = g_menu_new ();
red = priv->color.red;
green = priv->color.green;
blue = priv->color.blue;
alpha = priv->color.alpha;
section = g_menu_new ();
item = g_menu_item_new (_("Customize"), NULL);
g_menu_item_set_action_and_target_value (item, "color.customize",
g_variant_new ("(dddd)", red, green, blue, alpha));
g_menu_append_item (section, item);
g_menu_append_section (menu, NULL, G_MENU_MODEL (section));
g_object_unref (item);
g_object_unref (section);
return G_MENU_MODEL (menu);
}
static void
do_popup (GtkColorSwatch *swatch)
{
GtkColorSwatchPrivate *priv = gtk_color_swatch_get_instance_private (swatch);
GMenuModel *model;
g_clear_pointer (&priv->popover, gtk_widget_unparent);
model = gtk_color_swatch_get_menu_model (swatch);
priv->popover = gtk_popover_menu_new_from_model (model);
gtk_widget_set_parent (priv->popover, GTK_WIDGET (swatch));
g_object_unref (model);
gtk_popover_popup (GTK_POPOVER (priv->popover));
}
static gboolean
swatch_primary_action (GtkColorSwatch *swatch)
{
GtkColorSwatchPrivate *priv = gtk_color_swatch_get_instance_private (swatch);
GtkWidget *widget = (GtkWidget *)swatch;
GtkStateFlags flags;
flags = gtk_widget_get_state_flags (widget);
if (!priv->has_color)
{
customize_color (swatch);
return TRUE;
}
else if (priv->selectable &&
(flags & GTK_STATE_FLAG_SELECTED) == 0)
{
gtk_widget_set_state_flags (widget, GTK_STATE_FLAG_SELECTED, FALSE);
return TRUE;
}
return FALSE;
}
static void
hold_action (GtkGestureLongPress *gesture,
gdouble x,
gdouble y,
GtkColorSwatch *swatch)
{
do_popup (swatch);
gtk_gesture_set_state (GTK_GESTURE (gesture), GTK_EVENT_SEQUENCE_CLAIMED);
}
static void
tap_action (GtkGestureClick *gesture,
gint n_press,
gdouble x,
gdouble y,
GtkColorSwatch *swatch)
{
GtkColorSwatchPrivate *priv = gtk_color_swatch_get_instance_private (swatch);
guint button;
button = gtk_gesture_single_get_current_button (GTK_GESTURE_SINGLE (gesture));
if (button == GDK_BUTTON_PRIMARY)
{
if (n_press == 1)
swatch_primary_action (swatch);
else if (n_press > 1)
activate_color (swatch);
}
else if (button == GDK_BUTTON_SECONDARY)
{
if (priv->has_color && priv->has_menu)
do_popup (swatch);
}
}
static void
swatch_size_allocate (GtkWidget *widget,
int width,
int height,
int baseline)
{
GtkColorSwatch *swatch = GTK_COLOR_SWATCH (widget);
GtkColorSwatchPrivate *priv = gtk_color_swatch_get_instance_private (swatch);
gtk_widget_size_allocate (priv->overlay_widget,
&(GtkAllocation) {
0, 0,
width, height
}, -1);
if (priv->popover)
gtk_native_check_resize (GTK_NATIVE (priv->popover));
}
static void
gtk_color_swatch_measure (GtkWidget *widget,
GtkOrientation orientation,
int for_size,
int *minimum,
int *natural,
int *minimum_baseline,
int *natural_baseline)
{
GtkColorSwatch *swatch = GTK_COLOR_SWATCH (widget);
GtkColorSwatchPrivate *priv = gtk_color_swatch_get_instance_private (swatch);
gint w, h, min;
gtk_widget_measure (priv->overlay_widget,
orientation,
-1,
minimum, natural,
NULL, NULL);
gtk_widget_get_size_request (widget, &w, &h);
if (orientation == GTK_ORIENTATION_HORIZONTAL)
min = w < 0 ? 48 : w;
else
min = h < 0 ? 32 : h;
*minimum = MAX (*minimum, min);
*natural = MAX (*natural, min);
}
static gboolean
swatch_popup_menu (GtkWidget *widget)
{
do_popup (GTK_COLOR_SWATCH (widget));
return TRUE;
}
static void
update_icon (GtkColorSwatch *swatch)
{
GtkColorSwatchPrivate *priv = gtk_color_swatch_get_instance_private (swatch);
GtkImage *image = GTK_IMAGE (priv->overlay_widget);
if (priv->icon)
gtk_image_set_from_icon_name (image, priv->icon);
else if (gtk_widget_get_state_flags (GTK_WIDGET (swatch)) & GTK_STATE_FLAG_SELECTED)
gtk_image_set_from_icon_name (image, "object-select-symbolic");
else
gtk_image_clear (image);
}
static void
swatch_state_flags_changed (GtkWidget *widget,
GtkStateFlags previous_state)
{
GtkColorSwatch *swatch = GTK_COLOR_SWATCH (widget);
update_icon (swatch);
GTK_WIDGET_CLASS (gtk_color_swatch_parent_class)->state_flags_changed (widget, previous_state);
}
/* GObject implementation {{{1 */
static void
swatch_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GtkColorSwatch *swatch = GTK_COLOR_SWATCH (object);
GtkColorSwatchPrivate *priv = gtk_color_swatch_get_instance_private (swatch);
GdkRGBA color;
switch (prop_id)
{
case PROP_RGBA:
gtk_color_swatch_get_rgba (swatch, &color);
g_value_set_boxed (value, &color);
break;
case PROP_SELECTABLE:
g_value_set_boolean (value, gtk_color_swatch_get_selectable (swatch));
break;
case PROP_HAS_MENU:
g_value_set_boolean (value, priv->has_menu);
break;
case PROP_CAN_DROP:
g_value_set_boolean (value, priv->dest != NULL);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
swatch_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GtkColorSwatch *swatch = GTK_COLOR_SWATCH (object);
GtkColorSwatchPrivate *priv = gtk_color_swatch_get_instance_private (swatch);
switch (prop_id)
{
case PROP_RGBA:
gtk_color_swatch_set_rgba (swatch, g_value_get_boxed (value));
break;
case PROP_SELECTABLE:
gtk_color_swatch_set_selectable (swatch, g_value_get_boolean (value));
break;
case PROP_HAS_MENU:
priv->has_menu = g_value_get_boolean (value);
break;
case PROP_CAN_DROP:
gtk_color_swatch_set_can_drop (swatch, g_value_get_boolean (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
swatch_finalize (GObject *object)
{
GtkColorSwatch *swatch = GTK_COLOR_SWATCH (object);
GtkColorSwatchPrivate *priv = gtk_color_swatch_get_instance_private (swatch);
g_free (priv->icon);
gtk_widget_unparent (priv->overlay_widget);
G_OBJECT_CLASS (gtk_color_swatch_parent_class)->finalize (object);
}
static void
swatch_dispose (GObject *object)
{
GtkColorSwatch *swatch = GTK_COLOR_SWATCH (object);
GtkColorSwatchPrivate *priv = gtk_color_swatch_get_instance_private (swatch);
g_clear_pointer (&priv->popover, gtk_widget_unparent);
G_OBJECT_CLASS (gtk_color_swatch_parent_class)->dispose (object);
}
static void
gtk_color_swatch_class_init (GtkColorSwatchClass *class)
{
GtkWidgetClass *widget_class = (GtkWidgetClass *)class;
GObjectClass *object_class = (GObjectClass *)class;
object_class->get_property = swatch_get_property;
object_class->set_property = swatch_set_property;
object_class->finalize = swatch_finalize;
object_class->dispose = swatch_dispose;
widget_class->measure = gtk_color_swatch_measure;
widget_class->snapshot = swatch_snapshot;
widget_class->popup_menu = swatch_popup_menu;
widget_class->size_allocate = swatch_size_allocate;
widget_class->state_flags_changed = swatch_state_flags_changed;
g_object_class_install_property (object_class, PROP_RGBA,
g_param_spec_boxed ("rgba", P_("RGBA Color"), P_("Color as RGBA"),
GDK_TYPE_RGBA, GTK_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_SELECTABLE,
g_param_spec_boolean ("selectable", P_("Selectable"), P_("Whether the swatch is selectable"),
TRUE, GTK_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_HAS_MENU,
g_param_spec_boolean ("has-menu", P_("Has Menu"), P_("Whether the swatch should offer customization"),
TRUE, GTK_PARAM_READWRITE));
g_object_class_install_property (object_class, PROP_CAN_DROP,
g_param_spec_boolean ("can-drop", P_("Can Drop"), P_("Whether the swatch should accept drops"),
FALSE, GTK_PARAM_READWRITE));
gtk_widget_class_set_accessible_type (widget_class, GTK_TYPE_COLOR_SWATCH_ACCESSIBLE);
gtk_widget_class_set_css_name (widget_class, I_("colorswatch"));
}
static void
gtk_color_swatch_init (GtkColorSwatch *swatch)
{
GtkColorSwatchPrivate *priv = gtk_color_swatch_get_instance_private (swatch);
GtkEventController *controller;
GtkGesture *gesture;
priv->use_alpha = TRUE;
priv->selectable = TRUE;
priv->has_menu = TRUE;
priv->color.red = 0.75;
priv->color.green = 0.25;
priv->color.blue = 0.25;
priv->color.alpha = 1.0;
gtk_widget_set_can_focus (GTK_WIDGET (swatch), TRUE);
gtk_widget_set_overflow (GTK_WIDGET (swatch), GTK_OVERFLOW_HIDDEN);
gesture = gtk_gesture_long_press_new ();
gtk_gesture_single_set_touch_only (GTK_GESTURE_SINGLE (gesture),
TRUE);
g_signal_connect (gesture, "pressed",
G_CALLBACK (hold_action), swatch);
gtk_widget_add_controller (GTK_WIDGET (swatch), GTK_EVENT_CONTROLLER (gesture));
gesture = gtk_gesture_click_new ();
gtk_gesture_single_set_button (GTK_GESTURE_SINGLE (gesture), 0);
g_signal_connect (gesture, "pressed",
G_CALLBACK (tap_action), swatch);
gtk_widget_add_controller (GTK_WIDGET (swatch), GTK_EVENT_CONTROLLER (gesture));
controller = gtk_event_controller_key_new ();
g_signal_connect (controller, "key-pressed",
G_CALLBACK (key_controller_key_pressed), swatch);
gtk_widget_add_controller (GTK_WIDGET (swatch), controller);
gtk_widget_add_css_class (GTK_WIDGET (swatch), "activatable");
priv->overlay_widget = g_object_new (GTK_TYPE_IMAGE,
"css-name", "overlay",
NULL);
gtk_widget_set_parent (priv->overlay_widget, GTK_WIDGET (swatch));
}
/* Public API {{{1 */
GtkWidget *
gtk_color_swatch_new (void)
{
return (GtkWidget *) g_object_new (GTK_TYPE_COLOR_SWATCH, NULL);
}
static GdkContentProvider *
gtk_color_swatch_drag_prepare (GtkDragSource *source,
double x,
double y,
GtkColorSwatch *swatch)
{
GtkColorSwatchPrivate *priv = gtk_color_swatch_get_instance_private (swatch);
return gdk_content_provider_new_typed (GDK_TYPE_RGBA, &priv->color);
}
void
gtk_color_swatch_set_rgba (GtkColorSwatch *swatch,
const GdkRGBA *color)
{
GtkColorSwatchPrivate *priv = gtk_color_swatch_get_instance_private (swatch);
if (!priv->has_color)
{
GtkDragSource *source;
source = gtk_drag_source_new ();
g_signal_connect (source, "prepare", G_CALLBACK (gtk_color_swatch_drag_prepare), swatch);
g_signal_connect (source, "drag-begin", G_CALLBACK (gtk_color_swatch_drag_begin), swatch);
gtk_widget_add_controller (GTK_WIDGET (swatch), GTK_EVENT_CONTROLLER (source));
}
priv->has_color = TRUE;
priv->color = *color;
if (INTENSITY (priv->color.red, priv->color.green, priv->color.blue) > 0.5)
{
gtk_widget_add_css_class (GTK_WIDGET (swatch), "light");
gtk_widget_remove_css_class (GTK_WIDGET (swatch), "dark");
}
else
{
gtk_widget_add_css_class (GTK_WIDGET (swatch), "dark");
gtk_widget_remove_css_class (GTK_WIDGET (swatch), "light");
}
gtk_widget_queue_draw (GTK_WIDGET (swatch));
g_object_notify (G_OBJECT (swatch), "rgba");
}
gboolean
gtk_color_swatch_get_rgba (GtkColorSwatch *swatch,
GdkRGBA *color)
{
GtkColorSwatchPrivate *priv = gtk_color_swatch_get_instance_private (swatch);
if (priv->has_color)
{
color->red = priv->color.red;
color->green = priv->color.green;
color->blue = priv->color.blue;
color->alpha = priv->color.alpha;
return TRUE;
}
else
{
color->red = 1.0;
color->green = 1.0;
color->blue = 1.0;
color->alpha = 1.0;
return FALSE;
}
}
void
gtk_color_swatch_set_icon (GtkColorSwatch *swatch,
const gchar *icon)
{
GtkColorSwatchPrivate *priv = gtk_color_swatch_get_instance_private (swatch);
priv->icon = g_strdup (icon);
update_icon (swatch);
gtk_widget_queue_draw (GTK_WIDGET (swatch));
}
void
gtk_color_swatch_set_can_drop (GtkColorSwatch *swatch,
gboolean can_drop)
{
GtkColorSwatchPrivate *priv = gtk_color_swatch_get_instance_private (swatch);
if (can_drop == (priv->dest != NULL))
return;
if (can_drop && !priv->dest)
{
priv->dest = gtk_drop_target_new (GDK_TYPE_RGBA, GDK_ACTION_COPY);
g_signal_connect (priv->dest, "drop", G_CALLBACK (swatch_drag_drop), swatch);
gtk_widget_add_controller (GTK_WIDGET (swatch), GTK_EVENT_CONTROLLER (priv->dest));
}
if (!can_drop && priv->dest)
{
gtk_widget_remove_controller (GTK_WIDGET (swatch), GTK_EVENT_CONTROLLER (priv->dest));
priv->dest = NULL;
}
g_object_notify (G_OBJECT (swatch), "can-drop");
}
void
gtk_color_swatch_set_use_alpha (GtkColorSwatch *swatch,
gboolean use_alpha)
{
GtkColorSwatchPrivate *priv = gtk_color_swatch_get_instance_private (swatch);
priv->use_alpha = use_alpha;
gtk_widget_queue_draw (GTK_WIDGET (swatch));
}
void
gtk_color_swatch_set_selectable (GtkColorSwatch *swatch,
gboolean selectable)
{
GtkColorSwatchPrivate *priv = gtk_color_swatch_get_instance_private (swatch);
if (selectable == priv->selectable)
return;
priv->selectable = selectable;
g_object_notify (G_OBJECT (swatch), "selectable");
}
gboolean
gtk_color_swatch_get_selectable (GtkColorSwatch *swatch)
{
GtkColorSwatchPrivate *priv = gtk_color_swatch_get_instance_private (swatch);
return priv->selectable;
}
/* vim:set foldmethod=marker: */
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