gtk2/gtk/gtkcolorswatch.c
2020-02-17 04:04:21 +01:00

710 lines
21 KiB
C

/* 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 "gtkdragdest.h"
#include "gtkdragsource.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 void
got_color (GObject *source,
GAsyncResult *result,
gpointer data)
{
GdkDrop *drop = GDK_DROP (source);
const GValue *value;
value = gdk_drop_read_value_finish (drop, result, NULL);
if (value)
{
GdkRGBA *color = g_value_get_boxed (value);
gtk_color_swatch_set_rgba (GTK_COLOR_SWATCH (data), color);
gdk_drop_finish (drop, GDK_ACTION_COPY);
}
else
gdk_drop_finish (drop, 0);
}
static gboolean
swatch_drag_drop (GtkDropTarget *dest,
GdkDrop *drop,
int x,
int y,
GtkColorSwatch *swatch)
{
gdk_drop_read_value_async (drop, GDK_TYPE_RGBA, G_PRIORITY_DEFAULT, NULL, got_color, swatch);
return TRUE;
}
static void
activate_color (GtkColorSwatch *swatch)
{
GtkColorSwatchPrivate *priv = gtk_color_swatch_get_instance_private (swatch);
gtk_widget_activate_action (GTK_WIDGET (swatch),
"color.select", "(dddd)",
priv->color.red,
priv->color.green,
priv->color.blue,
priv->color.alpha);
}
static void
customize_color (GtkColorSwatch *swatch)
{
GtkColorSwatchPrivate *priv = gtk_color_swatch_get_instance_private (swatch);
gtk_widget_activate_action (GTK_WIDGET (swatch),
"color.customize", "(dddd)",
priv->color.red,
priv->color.green,
priv->color.blue,
priv->color.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;
menu = g_menu_new ();
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)",
priv->color.red,
priv->color.green,
priv->color.blue,
priv->color.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 (GTK_WIDGET (swatch), model);
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_content_formats_new_for_gtype (GDK_TYPE_RGBA),
GDK_ACTION_COPY);
g_signal_connect (priv->dest, "drag-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: */