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gtk2/gtk/gtkcolorscale.c
Matthias Clasen 394ea32e93 Use gtk_widget_add/remove_css_class more 
Replace most uses of gtk_style_context_add/remove_class
by the new APIs. The only remaining uses of the old API
are in save/restore situations.
2020-04-10 12:09:57 -04:00

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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 "gtkcolorscaleprivate.h"
#include "gtkcolorchooserprivate.h"
#include "gtkgesturelongpress.h"
#include "gtkcolorutils.h"
#include "gtkorientable.h"
#include "gtkrangeprivate.h"
#include "gtkaccessible.h"
#include "gtkprivate.h"
#include "gtkintl.h"
#include "gtksnapshot.h"
#include "gtkshortcutcontroller.h"
#include "gtkshortcuttrigger.h"
#include "gtkshortcutaction.h"
#include "gtkshortcut.h"
#include <math.h>
typedef struct
{
GdkRGBA color;
GtkColorScaleType type;
GdkTexture *hue_texture;
} GtkColorScalePrivate;
enum
{
PROP_ZERO,
PROP_SCALE_TYPE
};
static void hold_action (GtkGestureLongPress *gesture,
gdouble x,
gdouble y,
GtkWidget *scale);
G_DEFINE_TYPE_WITH_PRIVATE (GtkColorScale, gtk_color_scale, GTK_TYPE_SCALE)
void
gtk_color_scale_snapshot_trough (GtkColorScale *scale,
GtkSnapshot *snapshot,
int width,
int height)
{
GtkColorScalePrivate *priv = gtk_color_scale_get_instance_private (scale);
GtkWidget *widget = GTK_WIDGET (scale);
if (width <= 1 || height <= 1)
return;
if (priv->hue_texture &&
(width != gdk_texture_get_width (priv->hue_texture) ||
height != gdk_texture_get_height (priv->hue_texture)))
g_clear_object (&priv->hue_texture);
if (priv->type == GTK_COLOR_SCALE_HUE)
{
if (!priv->hue_texture)
{
GdkTexture *texture;
gint stride;
GBytes *bytes;
guchar *data, *p;
gdouble h;
float r, g, b;
gdouble f;
int hue_x, hue_y;
stride = width * 3;
data = g_malloc (width * height * 3);
f = 1.0 / (height - 1);
for (hue_y = 0; hue_y < height; hue_y++)
{
h = CLAMP (hue_y * f, 0.0, 1.0);
p = data + hue_y * stride;
for (hue_x = 0; hue_x < stride; hue_x += 3)
{
gtk_hsv_to_rgb (h, 1, 1, &r, &g, &b);
p[hue_x + 0] = CLAMP (r * 255, 0, 255);
p[hue_x + 1] = CLAMP (g * 255, 0, 255);
p[hue_x + 2] = CLAMP (b * 255, 0, 255);
}
}
bytes = g_bytes_new_take (data, width * height * 3);
texture = gdk_memory_texture_new (width, height,
GDK_MEMORY_R8G8B8,
bytes,
stride);
g_bytes_unref (bytes);
priv->hue_texture = texture;
}
gtk_snapshot_append_texture (snapshot,
priv->hue_texture,
&GRAPHENE_RECT_INIT(0, 0, width, height));
}
else if (priv->type == GTK_COLOR_SCALE_ALPHA)
{
graphene_point_t start, end;
const GdkRGBA *color;
if (gtk_orientable_get_orientation (GTK_ORIENTABLE (widget)) == GTK_ORIENTATION_HORIZONTAL &&
gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL)
{
graphene_point_init (&start, width, 0);
graphene_point_init (&end, 0, 0);
}
else
{
graphene_point_init (&start, 0, 0);
graphene_point_init (&end, width, 0);
}
_gtk_color_chooser_snapshot_checkered_pattern (snapshot, width, height);
color = &priv->color;
gtk_snapshot_append_linear_gradient (snapshot,
&GRAPHENE_RECT_INIT(0, 0, width, height),
&start,
&end,
(GskColorStop[2]) {
{ 0, { color->red, color->green, color->blue, 0 } },
{ 1, { color->red, color->green, color->blue, 1 } },
},
2);
}
}
static void
gtk_color_scale_init (GtkColorScale *scale)
{
GtkGesture *gesture;
gesture = gtk_gesture_long_press_new ();
g_signal_connect (gesture, "pressed",
G_CALLBACK (hold_action), scale);
gtk_event_controller_set_propagation_phase (GTK_EVENT_CONTROLLER (gesture),
GTK_PHASE_TARGET);
gtk_widget_add_controller (GTK_WIDGET (scale), GTK_EVENT_CONTROLLER (gesture));
gtk_widget_add_css_class (GTK_WIDGET (scale), "color");
}
static void
scale_constructed (GObject *object)
{
GtkColorScale *scale = GTK_COLOR_SCALE (object);
GtkColorScalePrivate *priv = gtk_color_scale_get_instance_private (scale);
GtkEventController *controller;
GtkShortcutTrigger *trigger;
GtkShortcutAction *action;
GtkShortcut *shortcut;
controller = gtk_shortcut_controller_new ();
trigger = gtk_alternative_trigger_new (gtk_keyval_trigger_new (GDK_KEY_F10, GDK_SHIFT_MASK),
gtk_keyval_trigger_new (GDK_KEY_Menu, 0));
action = gtk_named_action_new ("color.edit");
shortcut = gtk_shortcut_new_with_arguments (trigger,
action,
"s",
priv->type == GTK_COLOR_SCALE_ALPHA
? "a" : "h");
gtk_shortcut_controller_add_shortcut (GTK_SHORTCUT_CONTROLLER (controller), shortcut);
gtk_widget_add_controller (GTK_WIDGET (scale), controller);
}
static void
scale_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GtkColorScale *scale = GTK_COLOR_SCALE (object);
GtkColorScalePrivate *priv = gtk_color_scale_get_instance_private (scale);
switch (prop_id)
{
case PROP_SCALE_TYPE:
g_value_set_int (value, priv->type);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
scale_set_type (GtkColorScale *scale,
GtkColorScaleType type)
{
GtkColorScalePrivate *priv = gtk_color_scale_get_instance_private (scale);
AtkObject *atk_obj;
priv->type = type;
atk_obj = gtk_widget_get_accessible (GTK_WIDGET (scale));
if (GTK_IS_ACCESSIBLE (atk_obj))
{
if (type == GTK_COLOR_SCALE_HUE)
atk_object_set_name (atk_obj, C_("Color channel", "Hue"));
else if (type == GTK_COLOR_SCALE_ALPHA)
atk_object_set_name (atk_obj, C_("Color channel", "Alpha"));
atk_object_set_role (atk_obj, ATK_ROLE_COLOR_CHOOSER);
}
}
static void
scale_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GtkColorScale *scale = GTK_COLOR_SCALE (object);
switch (prop_id)
{
case PROP_SCALE_TYPE:
scale_set_type (scale, (GtkColorScaleType)g_value_get_int (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
hold_action (GtkGestureLongPress *gesture,
gdouble x,
gdouble y,
GtkWidget *scale)
{
gtk_widget_activate_action (scale,
"color.edit",
"s", gtk_widget_get_name (scale));
}
static void
scale_finalize (GObject *object)
{
GtkColorScalePrivate *priv = gtk_color_scale_get_instance_private (GTK_COLOR_SCALE (object));
g_clear_object (&priv->hue_texture);
G_OBJECT_CLASS (gtk_color_scale_parent_class)->finalize (object);
}
static void
gtk_color_scale_class_init (GtkColorScaleClass *class)
{
GObjectClass *object_class = G_OBJECT_CLASS (class);
object_class->constructed = scale_constructed;
object_class->finalize = scale_finalize;
object_class->get_property = scale_get_property;
object_class->set_property = scale_set_property;
g_object_class_install_property (object_class, PROP_SCALE_TYPE,
g_param_spec_int ("scale-type", P_("Scale type"), P_("Scale type"),
0, 1, 0,
GTK_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
}
void
gtk_color_scale_set_rgba (GtkColorScale *scale,
const GdkRGBA *color)
{
GtkColorScalePrivate *priv = gtk_color_scale_get_instance_private (scale);
priv->color = *color;
gtk_widget_queue_draw (gtk_range_get_trough_widget (GTK_RANGE (scale)));
}
GtkWidget *
gtk_color_scale_new (GtkAdjustment *adjustment,
GtkColorScaleType type)
{
return g_object_new (GTK_TYPE_COLOR_SCALE,
"adjustment", adjustment,
"draw-value", FALSE,
"scale-type", type,
NULL);
}
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