gtk2/gtk/gtkcolorplane.c

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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
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
#include "config.h"
#include "gtkcolorplaneprivate.h"
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#include "gtkaccessible.h"
#include "gtkadjustment.h"
#include "gtkcolorutils.h"
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#include "gtkgesturedrag.h"
#include "gtkgesturelongpress.h"
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#include "gtkintl.h"
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#include "gtksnapshot.h"
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struct _GtkColorPlanePrivate
{
GtkAdjustment *h_adj;
GtkAdjustment *s_adj;
GtkAdjustment *v_adj;
GdkWindow *input_window;
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cairo_surface_t *surface;
GtkGesture *drag_gesture;
GtkGesture *long_press_gesture;
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};
enum {
PROP_0,
PROP_H_ADJUSTMENT,
PROP_S_ADJUSTMENT,
PROP_V_ADJUSTMENT
};
G_DEFINE_TYPE_WITH_PRIVATE (GtkColorPlane, gtk_color_plane, GTK_TYPE_WIDGET)
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static void
sv_to_xy (GtkColorPlane *plane,
gint *x,
gint *y)
{
gdouble s, v;
gint width, height;
width = gtk_widget_get_allocated_width (GTK_WIDGET (plane));
height = gtk_widget_get_allocated_height (GTK_WIDGET (plane));
s = gtk_adjustment_get_value (plane->priv->s_adj);
v = gtk_adjustment_get_value (plane->priv->v_adj);
*x = CLAMP (width * v, 0, width - 1);
*y = CLAMP (height * (1 - s), 0, height - 1);
}
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static void
plane_snapshot (GtkWidget *widget,
GtkSnapshot *snapshot)
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{
GtkColorPlane *plane = GTK_COLOR_PLANE (widget);
gint x, y;
gint width, height;
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cairo_t *cr;
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sv_to_xy (plane, &x, &y);
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width = gtk_widget_get_allocated_width (widget);
height = gtk_widget_get_allocated_height (widget);
cr = gtk_snapshot_append_cairo (snapshot,
&GRAPHENE_RECT_INIT (0, 0, width, height),
"ColorPlane");
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cairo_set_source_surface (cr, plane->priv->surface, 0, 0);
cairo_paint (cr);
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cairo_move_to (cr, 0, y + 0.5);
cairo_line_to (cr, width, y + 0.5);
cairo_move_to (cr, x + 0.5, 0);
cairo_line_to (cr, x + 0.5, height);
if (gtk_widget_has_visible_focus (widget))
{
cairo_set_line_width (cr, 3.0);
cairo_set_source_rgba (cr, 1.0, 1.0, 1.0, 0.6);
cairo_stroke_preserve (cr);
cairo_set_line_width (cr, 1.0);
cairo_set_source_rgba (cr, 0.0, 0.0, 0.0, 0.8);
cairo_stroke (cr);
}
else
{
cairo_set_line_width (cr, 1.0);
cairo_set_source_rgba (cr, 0.8, 0.8, 0.8, 0.8);
cairo_stroke (cr);
}
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cairo_destroy (cr);
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}
static void
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create_surface (GtkColorPlane *plane)
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{
GtkWidget *widget = GTK_WIDGET (plane);
cairo_t *cr;
cairo_surface_t *surface;
gint width, height, stride;
cairo_surface_t *tmp;
guint red, green, blue;
guint32 *data, *p;
gdouble h, s, v;
gdouble r, g, b;
gdouble sf, vf;
gint x, y;
if (!gtk_widget_get_realized (widget))
return;
width = gtk_widget_get_allocated_width (widget);
height = gtk_widget_get_allocated_height (widget);
surface = gdk_window_create_similar_surface (gtk_widget_get_window (widget),
CAIRO_CONTENT_COLOR,
width, height);
if (plane->priv->surface)
cairo_surface_destroy (plane->priv->surface);
plane->priv->surface = surface;
if (width == 1 || height == 1)
return;
stride = cairo_format_stride_for_width (CAIRO_FORMAT_RGB24, width);
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data = g_malloc (height * stride);
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h = gtk_adjustment_get_value (plane->priv->h_adj);
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sf = 1.0 / (height - 1);
vf = 1.0 / (width - 1);
for (y = 0; y < height; y++)
{
s = CLAMP (1.0 - y * sf, 0.0, 1.0);
p = data + y * (stride / 4);
for (x = 0; x < width; x++)
{
v = x * vf;
gtk_hsv_to_rgb (h, s, v, &r, &g, &b);
red = CLAMP (r * 255, 0, 255);
green = CLAMP (g * 255, 0, 255);
blue = CLAMP (b * 255, 0, 255);
p[x] = (red << 16) | (green << 8) | blue;
}
}
tmp = cairo_image_surface_create_for_data ((guchar *)data, CAIRO_FORMAT_RGB24,
width, height, stride);
cr = cairo_create (surface);
cairo_set_source_surface (cr, tmp, 0, 0);
cairo_paint (cr);
cairo_destroy (cr);
cairo_surface_destroy (tmp);
g_free (data);
}
static void
plane_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
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{
GtkColorPlane *plane = GTK_COLOR_PLANE (widget);
GTK_WIDGET_CLASS (gtk_color_plane_parent_class)->size_allocate (widget, allocation);
if (gtk_widget_get_realized (widget))
gdk_window_move_resize (plane->priv->input_window,
allocation->x, allocation->y,
allocation->width, allocation->height);
create_surface (plane);
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}
static void
plane_realize (GtkWidget *widget)
{
GtkColorPlane *plane = GTK_COLOR_PLANE (widget);
GtkColorPlanePrivate *priv = gtk_color_plane_get_instance_private (plane);
GtkAllocation allocation;
GTK_WIDGET_CLASS (gtk_color_plane_parent_class)->realize (widget);
gtk_widget_get_allocation (widget, &allocation);
priv->input_window = gdk_window_new_input (gtk_widget_get_window (widget),
gtk_widget_get_events (widget)
| GDK_KEY_PRESS_MASK
| GDK_TOUCH_MASK
| GDK_BUTTON_PRESS_MASK
| GDK_BUTTON_RELEASE_MASK
| GDK_POINTER_MOTION_MASK,
&allocation);
gtk_widget_register_window (widget, priv->input_window);
gtk_gesture_set_window (priv->drag_gesture, priv->input_window);
gtk_gesture_set_window (priv->long_press_gesture, priv->input_window);
create_surface (GTK_COLOR_PLANE (widget));
}
static void
plane_unrealize (GtkWidget *widget)
{
GtkColorPlane *plane = GTK_COLOR_PLANE (widget);
GtkColorPlanePrivate *priv = gtk_color_plane_get_instance_private (plane);
g_clear_pointer (&priv->surface, cairo_surface_destroy);
gtk_gesture_set_window (priv->drag_gesture, NULL);
gtk_gesture_set_window (priv->long_press_gesture, NULL);
gtk_widget_unregister_window (widget, priv->input_window);
gdk_window_destroy (priv->input_window);
priv->input_window = NULL;
GTK_WIDGET_CLASS (gtk_color_plane_parent_class)->unrealize (widget);
}
static void
plane_map (GtkWidget *widget)
{
GtkColorPlane *plane = GTK_COLOR_PLANE (widget);
GtkColorPlanePrivate *priv = gtk_color_plane_get_instance_private (plane);
gdk_window_show (priv->input_window);
GTK_WIDGET_CLASS (gtk_color_plane_parent_class)->map (widget);
}
static void
plane_unmap (GtkWidget *widget)
{
GtkColorPlane *plane = GTK_COLOR_PLANE (widget);
GtkColorPlanePrivate *priv = gtk_color_plane_get_instance_private (plane);
GTK_WIDGET_CLASS (gtk_color_plane_parent_class)->unmap (widget);
gdk_window_hide (priv->input_window);
}
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static void
set_cross_cursor (GtkWidget *widget,
gboolean enabled)
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{
GdkCursor *cursor = NULL;
GdkWindow *window;
GdkDevice *device;
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window = gtk_widget_get_window (widget);
device = gtk_gesture_get_device (GTK_COLOR_PLANE (widget)->priv->drag_gesture);
if (!window || !device)
return;
if (enabled)
cursor = gdk_cursor_new_from_name (gtk_widget_get_display (GTK_WIDGET (widget)), "crosshair");
gdk_window_set_device_cursor (window, device, cursor);
if (cursor)
g_object_unref (cursor);
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}
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static void
h_changed (GtkColorPlane *plane)
{
create_surface (plane);
gtk_widget_queue_draw (GTK_WIDGET (plane));
}
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static void
sv_changed (GtkColorPlane *plane)
{
gtk_widget_queue_draw (GTK_WIDGET (plane));
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}
static void
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update_color (GtkColorPlane *plane,
gint x,
gint y)
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{
GtkWidget *widget = GTK_WIDGET (plane);
gdouble s, v;
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s = CLAMP (1 - y * (1.0 / gtk_widget_get_allocated_height (widget)), 0, 1);
v = CLAMP (x * (1.0 / gtk_widget_get_allocated_width (widget)), 0, 1);
gtk_adjustment_set_value (plane->priv->s_adj, s);
gtk_adjustment_set_value (plane->priv->v_adj, v);
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gtk_widget_queue_draw (widget);
}
static void
hold_action (GtkGestureLongPress *gesture,
gdouble x,
gdouble y,
GtkColorPlane *plane)
{
gboolean handled;
g_signal_emit_by_name (plane, "popup-menu", &handled);
}
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static void
sv_move (GtkColorPlane *plane,
gdouble ds,
gdouble dv)
{
gdouble s, v;
s = gtk_adjustment_get_value (plane->priv->s_adj);
v = gtk_adjustment_get_value (plane->priv->v_adj);
if (s + ds > 1)
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{
if (s < 1)
s = 1;
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else
goto error;
}
else if (s + ds < 0)
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{
if (s > 0)
s = 0;
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else
goto error;
}
else
{
s += ds;
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}
if (v + dv > 1)
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{
if (v < 1)
v = 1;
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else
goto error;
}
else if (v + dv < 0)
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{
if (v > 0)
v = 0;
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else
goto error;
}
else
{
v += dv;
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}
gtk_adjustment_set_value (plane->priv->s_adj, s);
gtk_adjustment_set_value (plane->priv->v_adj, v);
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return;
error:
gtk_widget_error_bell (GTK_WIDGET (plane));
}
static gboolean
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plane_key_press (GtkWidget *widget,
GdkEventKey *event)
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{
GtkColorPlane *plane = GTK_COLOR_PLANE (widget);
gdouble step;
if ((event->state & GDK_MOD1_MASK) != 0)
step = 0.1;
else
step = 0.01;
if (event->keyval == GDK_KEY_Up ||
event->keyval == GDK_KEY_KP_Up)
sv_move (plane, step, 0);
else if (event->keyval == GDK_KEY_Down ||
event->keyval == GDK_KEY_KP_Down)
sv_move (plane, -step, 0);
else if (event->keyval == GDK_KEY_Left ||
event->keyval == GDK_KEY_KP_Left)
sv_move (plane, 0, -step);
else if (event->keyval == GDK_KEY_Right ||
event->keyval == GDK_KEY_KP_Right)
sv_move (plane, 0, step);
else
return GTK_WIDGET_CLASS (gtk_color_plane_parent_class)->key_press_event (widget, event);
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return TRUE;
}
static void
plane_drag_gesture_begin (GtkGestureDrag *gesture,
gdouble start_x,
gdouble start_y,
GtkColorPlane *plane)
{
guint button;
button = gtk_gesture_single_get_current_button (GTK_GESTURE_SINGLE (gesture));
if (button == GDK_BUTTON_SECONDARY)
{
gboolean handled;
g_signal_emit_by_name (plane, "popup-menu", &handled);
}
if (button != GDK_BUTTON_PRIMARY)
{
gtk_gesture_set_state (GTK_GESTURE (gesture), GTK_EVENT_SEQUENCE_DENIED);
return;
}
set_cross_cursor (GTK_WIDGET (plane), TRUE);
update_color (plane, start_x, start_y);
gtk_widget_grab_focus (GTK_WIDGET (plane));
gtk_gesture_set_state (GTK_GESTURE (gesture), GTK_EVENT_SEQUENCE_CLAIMED);
}
static void
plane_drag_gesture_update (GtkGestureDrag *gesture,
gdouble offset_x,
gdouble offset_y,
GtkColorPlane *plane)
{
gdouble start_x, start_y;
gtk_gesture_drag_get_start_point (GTK_GESTURE_DRAG (gesture),
&start_x, &start_y);
update_color (plane, start_x + offset_x, start_y + offset_y);
}
static void
plane_drag_gesture_end (GtkGestureDrag *gesture,
gdouble offset_x,
gdouble offset_y,
GtkColorPlane *plane)
{
set_cross_cursor (GTK_WIDGET (plane), FALSE);
}
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static void
gtk_color_plane_init (GtkColorPlane *plane)
{
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AtkObject *atk_obj;
plane->priv = gtk_color_plane_get_instance_private (plane);
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gtk_widget_set_has_window (GTK_WIDGET (plane), FALSE);
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gtk_widget_set_can_focus (GTK_WIDGET (plane), TRUE);
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atk_obj = gtk_widget_get_accessible (GTK_WIDGET (plane));
if (GTK_IS_ACCESSIBLE (atk_obj))
{
atk_object_set_name (atk_obj, _("Color Plane"));
atk_object_set_role (atk_obj, ATK_ROLE_COLOR_CHOOSER);
}
plane->priv->drag_gesture = gtk_gesture_drag_new (GTK_WIDGET (plane));
g_signal_connect (plane->priv->drag_gesture, "drag-begin",
G_CALLBACK (plane_drag_gesture_begin), plane);
g_signal_connect (plane->priv->drag_gesture, "drag-update",
G_CALLBACK (plane_drag_gesture_update), plane);
g_signal_connect (plane->priv->drag_gesture, "drag-end",
G_CALLBACK (plane_drag_gesture_end), plane);
gtk_gesture_single_set_button (GTK_GESTURE_SINGLE (plane->priv->drag_gesture), 0);
plane->priv->long_press_gesture = gtk_gesture_long_press_new (GTK_WIDGET (plane));
g_signal_connect (plane->priv->long_press_gesture, "pressed",
G_CALLBACK (hold_action), plane);
gtk_gesture_single_set_touch_only (GTK_GESTURE_SINGLE (plane->priv->long_press_gesture),
TRUE);
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}
static void
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plane_finalize (GObject *object)
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{
GtkColorPlane *plane = GTK_COLOR_PLANE (object);
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if (plane->priv->surface)
cairo_surface_destroy (plane->priv->surface);
g_clear_object (&plane->priv->h_adj);
g_clear_object (&plane->priv->s_adj);
g_clear_object (&plane->priv->v_adj);
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g_clear_object (&plane->priv->drag_gesture);
g_clear_object (&plane->priv->long_press_gesture);
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G_OBJECT_CLASS (gtk_color_plane_parent_class)->finalize (object);
}
static void
plane_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GtkColorPlane *plane = GTK_COLOR_PLANE (object);
GObject *adjustment;
/* Construct only properties can only be set once, these are created
* only in order to be properly buildable from gtkcoloreditor.ui
*/
switch (prop_id)
{
case PROP_H_ADJUSTMENT:
adjustment = g_value_get_object (value);
if (adjustment)
{
plane->priv->h_adj = g_object_ref_sink (adjustment);
g_signal_connect_swapped (adjustment, "value-changed", G_CALLBACK (h_changed), plane);
}
break;
case PROP_S_ADJUSTMENT:
adjustment = g_value_get_object (value);
if (adjustment)
{
plane->priv->s_adj = g_object_ref_sink (adjustment);
g_signal_connect_swapped (adjustment, "value-changed", G_CALLBACK (sv_changed), plane);
}
break;
case PROP_V_ADJUSTMENT:
adjustment = g_value_get_object (value);
if (adjustment)
{
plane->priv->v_adj = g_object_ref_sink (adjustment);
g_signal_connect_swapped (adjustment, "value-changed", G_CALLBACK (sv_changed), plane);
}
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
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static void
gtk_color_plane_class_init (GtkColorPlaneClass *class)
{
GObjectClass *object_class = G_OBJECT_CLASS (class);
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
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object_class->finalize = plane_finalize;
object_class->set_property = plane_set_property;
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widget_class->snapshot = plane_snapshot;
widget_class->size_allocate = plane_size_allocate;
widget_class->realize = plane_realize;
widget_class->unrealize = plane_unrealize;
widget_class->map = plane_map;
widget_class->unmap = plane_unmap;
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widget_class->key_press_event = plane_key_press;
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g_object_class_install_property (object_class,
PROP_H_ADJUSTMENT,
g_param_spec_object ("h-adjustment",
"Hue Adjustment",
"Hue Adjustment",
GTK_TYPE_ADJUSTMENT,
G_PARAM_WRITABLE |
G_PARAM_CONSTRUCT_ONLY));
g_object_class_install_property (object_class,
PROP_S_ADJUSTMENT,
g_param_spec_object ("s-adjustment",
"Saturation Adjustment",
"Saturation Adjustment",
GTK_TYPE_ADJUSTMENT,
G_PARAM_WRITABLE |
G_PARAM_CONSTRUCT_ONLY));
g_object_class_install_property (object_class,
PROP_V_ADJUSTMENT,
g_param_spec_object ("v-adjustment",
"Value Adjustment",
"Value Adjustment",
GTK_TYPE_ADJUSTMENT,
G_PARAM_WRITABLE |
G_PARAM_CONSTRUCT_ONLY));
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}
GtkWidget *
gtk_color_plane_new (GtkAdjustment *h_adj,
GtkAdjustment *s_adj,
GtkAdjustment *v_adj)
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{
return g_object_new (GTK_TYPE_COLOR_PLANE,
"h-adjustment", h_adj,
"s-adjustment", s_adj,
"v-adjustment", v_adj,
NULL);
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}