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gimp/libgimp/gimpgradientselectbutton.c

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/* LIBGIMP - The GIMP Library
* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
*
* gimpgradientselectbutton.c
* Copyright (C) 1998 Andy Thomas
*
* 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 3 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
* Library 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
* <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gegl.h>
#include <gtk/gtk.h>
#include "libgimpwidgets/gimpwidgets.h"
#include "gimp.h"
#include "gimpuitypes.h"
#include "gimpgradientselectbutton.h"
#include "gimpuimarshal.h"
#include "libgimp-intl.h"
/**
* SECTION: gimpgradientselectbutton
* @title: GimpGradientSelectButton
* @short_description: A button which pops up a gradient select dialog.
*
* A button which pops up a gradient select dialog.
**/
#define CELL_HEIGHT 18
#define CELL_WIDTH 84
#define GIMP_GRADIENT_SELECT_BUTTON_GET_PRIVATE(obj) ((GimpGradientSelectButtonPrivate *) gimp_gradient_select_button_get_instance_private ((GimpGradientSelectButton *) (obj)))
typedef struct _GimpGradientSelectButtonPrivate GimpGradientSelectButtonPrivate;
struct _GimpGradientSelectButtonPrivate
{
gchar *title;
gchar *gradient_name; /* Local copy */
gint sample_size;
gboolean reverse;
gint n_samples;
gdouble *gradient_data; /* Local copy */
GtkWidget *inside;
GtkWidget *preview;
};
enum
{
GRADIENT_SET,
LAST_SIGNAL
};
enum
{
PROP_0,
PROP_TITLE,
PROP_GRADIENT_NAME
};
/* local function prototypes */
static void gimp_gradient_select_button_finalize (GObject *object);
static void gimp_gradient_select_button_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec);
static void gimp_gradient_select_button_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec);
static void gimp_gradient_select_button_clicked (GimpGradientSelectButton *button);
static void gimp_gradient_select_button_callback (const gchar *gradient_name,
gint n_samples,
const gdouble *gradient_data,
gboolean dialog_closing,
gpointer user_data);
static void gimp_gradient_select_preview_size_allocate
(GtkWidget *widget,
GtkAllocation *allocation,
GimpGradientSelectButton *button);
static gboolean gimp_gradient_select_preview_expose (GtkWidget *preview,
GdkEventExpose *event,
GimpGradientSelectButton *button);
static void gimp_gradient_select_drag_data_received (GimpGradientSelectButton *button,
GdkDragContext *context,
gint x,
gint y,
GtkSelectionData *selection,
guint info,
guint time);
static GtkWidget * gimp_gradient_select_button_create_inside (GimpGradientSelectButton *button);
static const GtkTargetEntry target = { "application/x-gimp-gradient-name", 0 };
static guint gradient_button_signals[LAST_SIGNAL] = { 0 };
G_DEFINE_TYPE_WITH_PRIVATE (GimpGradientSelectButton,
gimp_gradient_select_button,
GIMP_TYPE_SELECT_BUTTON)
static void
gimp_gradient_select_button_class_init (GimpGradientSelectButtonClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GimpSelectButtonClass *select_button_class = GIMP_SELECT_BUTTON_CLASS (klass);
object_class->finalize = gimp_gradient_select_button_finalize;
object_class->set_property = gimp_gradient_select_button_set_property;
object_class->get_property = gimp_gradient_select_button_get_property;
select_button_class->select_destroy = gimp_gradient_select_destroy;
klass->gradient_set = NULL;
/**
* GimpGradientSelectButton:title:
*
* The title to be used for the gradient selection popup dialog.
*
* Since: 2.4
*/
g_object_class_install_property (object_class, PROP_TITLE,
g_param_spec_string ("title",
"Title",
"The title to be used for the gradient selection popup dialog",
_("Gradient Selection"),
GIMP_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY));
/**
* GimpGradientSelectButton:gradient-name:
*
* The name of the currently selected gradient.
*
* Since: 2.4
*/
g_object_class_install_property (object_class, PROP_GRADIENT_NAME,
g_param_spec_string ("gradient-name",
"Gradient name",
"The name of the currently selected gradient",
NULL,
GIMP_PARAM_READWRITE));
/**
* GimpGradientSelectButton::gradient-set:
* @widget: the object which received the signal.
* @gradient_name: the name of the currently selected gradient.
* @width: width of the gradient
* @grad_data: gradient data
* @dialog_closing: whether the dialog was closed or not.
*
* The ::gradient-set signal is emitted when the user selects a gradient.
*
* Since: 2.4
*/
gradient_button_signals[GRADIENT_SET] =
g_signal_new ("gradient-set",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GimpGradientSelectButtonClass, gradient_set),
NULL, NULL,
_gimpui_marshal_VOID__STRING_INT_POINTER_BOOLEAN,
G_TYPE_NONE, 4,
G_TYPE_STRING,
G_TYPE_INT,
G_TYPE_POINTER,
G_TYPE_BOOLEAN);
}
static void
gimp_gradient_select_button_init (GimpGradientSelectButton *button)
{
GimpGradientSelectButtonPrivate *priv;
priv = GIMP_GRADIENT_SELECT_BUTTON_GET_PRIVATE (button);
priv->gradient_name = gimp_context_get_gradient ();
priv->sample_size = CELL_WIDTH;
priv->reverse = FALSE;
priv->inside = gimp_gradient_select_button_create_inside (button);
gtk_container_add (GTK_CONTAINER (button), priv->inside);
}
/**
* gimp_gradient_select_button_new:
* @title: Title of the dialog to use or %NULL to use the default title.
* @gradient_name: Initial gradient name.
*
* Creates a new #GtkWidget that completely controls the selection of
* a gradient. This widget is suitable for placement in a table in a
* plug-in dialog.
*
* Returns: A #GtkWidget that you can use in your UI.
*
* Since: 2.4
*/
GtkWidget *
gimp_gradient_select_button_new (const gchar *title,
const gchar *gradient_name)
{
GtkWidget *button;
if (title)
button = g_object_new (GIMP_TYPE_GRADIENT_SELECT_BUTTON,
"title", title,
"gradient-name", gradient_name,
NULL);
else
button = g_object_new (GIMP_TYPE_GRADIENT_SELECT_BUTTON,
"gradient-name", gradient_name,
NULL);
return button;
}
/**
* gimp_gradient_select_button_get_gradient:
* @button: A #GimpGradientSelectButton
*
* Retrieves the name of currently selected gradient.
*
* Returns: an internal copy of the gradient name which must not be freed.
*
* Since: 2.4
*/
const gchar *
gimp_gradient_select_button_get_gradient (GimpGradientSelectButton *button)
{
GimpGradientSelectButtonPrivate *priv;
g_return_val_if_fail (GIMP_IS_GRADIENT_SELECT_BUTTON (button), NULL);
priv = GIMP_GRADIENT_SELECT_BUTTON_GET_PRIVATE (button);
return priv->gradient_name;
}
/**
* gimp_gradient_select_button_set_gradient:
* @button: A #GimpGradientSelectButton
* @gradient_name: Gradient name to set.
*
* Sets the current gradient for the gradient select button.
*
* Since: 2.4
*/
void
gimp_gradient_select_button_set_gradient (GimpGradientSelectButton *button,
const gchar *gradient_name)
{
GimpGradientSelectButtonPrivate *priv;
GimpSelectButton *select_button;
g_return_if_fail (GIMP_IS_GRADIENT_SELECT_BUTTON (button));
priv = GIMP_GRADIENT_SELECT_BUTTON_GET_PRIVATE (button);
select_button = GIMP_SELECT_BUTTON (button);
if (select_button->temp_callback)
{
gimp_gradients_set_popup (select_button->temp_callback, gradient_name);
}
else
{
gchar *name;
gdouble *samples;
gint n_samples;
if (gradient_name && *gradient_name)
name = g_strdup (gradient_name);
else
name = gimp_context_get_gradient ();
if (gimp_gradient_get_uniform_samples (name,
priv->sample_size,
priv->reverse,
&n_samples,
&samples))
{
gimp_gradient_select_button_callback (name,
n_samples, samples,
FALSE, button);
g_free (samples);
}
g_free (name);
}
}
/* private functions */
static void
gimp_gradient_select_button_finalize (GObject *object)
{
GimpGradientSelectButtonPrivate *priv;
priv = GIMP_GRADIENT_SELECT_BUTTON_GET_PRIVATE (object);
g_clear_pointer (&priv->gradient_name, g_free);
g_clear_pointer (&priv->gradient_data, g_free);
g_clear_pointer (&priv->title, g_free);
G_OBJECT_CLASS (gimp_gradient_select_button_parent_class)->finalize (object);
}
static void
gimp_gradient_select_button_set_property (GObject *object,
guint property_id,
const GValue *value,
GParamSpec *pspec)
{
GimpGradientSelectButton *button;
GimpGradientSelectButtonPrivate *priv;
button = GIMP_GRADIENT_SELECT_BUTTON (object);
priv = GIMP_GRADIENT_SELECT_BUTTON_GET_PRIVATE (button);
switch (property_id)
{
case PROP_TITLE:
priv->title = g_value_dup_string (value);
break;
case PROP_GRADIENT_NAME:
gimp_gradient_select_button_set_gradient (button,
g_value_get_string (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_gradient_select_button_get_property (GObject *object,
guint property_id,
GValue *value,
GParamSpec *pspec)
{
GimpGradientSelectButton *button;
GimpGradientSelectButtonPrivate *priv;
button = GIMP_GRADIENT_SELECT_BUTTON (object);
priv = GIMP_GRADIENT_SELECT_BUTTON_GET_PRIVATE (button);
switch (property_id)
{
case PROP_TITLE:
g_value_set_string (value, priv->title);
break;
case PROP_GRADIENT_NAME:
g_value_set_string (value, priv->gradient_name);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static void
gimp_gradient_select_button_callback (const gchar *gradient_name,
gint n_samples,
const gdouble *gradient_data,
gboolean dialog_closing,
gpointer user_data)
{
GimpGradientSelectButton *button;
GimpGradientSelectButtonPrivate *priv;
GimpSelectButton *select_button;
button = GIMP_GRADIENT_SELECT_BUTTON (user_data);
priv = GIMP_GRADIENT_SELECT_BUTTON_GET_PRIVATE (button);
select_button = GIMP_SELECT_BUTTON (button);
g_free (priv->gradient_name);
g_free (priv->gradient_data);
priv->gradient_name = g_strdup (gradient_name);
priv->n_samples = n_samples;
priv->gradient_data = g_memdup (gradient_data, n_samples * sizeof (gdouble));
gtk_widget_queue_draw (priv->preview);
if (dialog_closing)
select_button->temp_callback = NULL;
g_signal_emit (button, gradient_button_signals[GRADIENT_SET], 0,
gradient_name, n_samples, gradient_data, dialog_closing);
g_object_notify (G_OBJECT (button), "gradient-name");
}
static void
gimp_gradient_select_button_clicked (GimpGradientSelectButton *button)
{
GimpGradientSelectButtonPrivate *priv;
GimpSelectButton *select_button;
priv = GIMP_GRADIENT_SELECT_BUTTON_GET_PRIVATE (button);
select_button = GIMP_SELECT_BUTTON (button);
if (select_button->temp_callback)
{
/* calling gimp_gradients_set_popup() raises the dialog */
gimp_gradients_set_popup (select_button->temp_callback,
priv->gradient_name);
}
else
{
select_button->temp_callback =
gimp_gradient_select_new (priv->title, priv->gradient_name,
priv->sample_size,
gimp_gradient_select_button_callback,
button);
}
}
static void
gimp_gradient_select_preview_size_allocate (GtkWidget *widget,
GtkAllocation *allocation,
GimpGradientSelectButton *button)
{
gdouble *samples;
gint n_samples;
GimpGradientSelectButtonPrivate *priv;
priv = GIMP_GRADIENT_SELECT_BUTTON_GET_PRIVATE (button);
if (gimp_gradient_get_uniform_samples (priv->gradient_name,
allocation->width,
priv->reverse,
&n_samples,
&samples))
{
g_free (priv->gradient_data);
priv->sample_size = allocation->width;
priv->n_samples = n_samples;
priv->gradient_data = samples;
}
}
static gboolean
gimp_gradient_select_preview_expose (GtkWidget *widget,
GdkEventExpose *event,
GimpGradientSelectButton *button)
{
GimpGradientSelectButtonPrivate *priv;
GtkAllocation allocation;
cairo_t *cr;
cairo_pattern_t *pattern;
cairo_surface_t *surface;
const gdouble *src;
guchar *dest;
gint width;
gint x;
priv = GIMP_GRADIENT_SELECT_BUTTON_GET_PRIVATE (button);
src = priv->gradient_data;
if (! src)
return FALSE;
gtk_widget_get_allocation (widget, &allocation);
cr = gdk_cairo_create (event->window);
gdk_cairo_region (cr, event->region);
cairo_clip (cr);
pattern = gimp_cairo_checkerboard_create (cr, GIMP_CHECK_SIZE_SM, NULL, NULL);
cairo_set_source (cr, pattern);
cairo_pattern_destroy (pattern);
cairo_paint (cr);
width = priv->n_samples / 4;
surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, width, 1);
for (x = 0, dest = cairo_image_surface_get_data (surface);
x < width;
x++, src += 4, dest += 4)
{
GimpRGB color;
guchar r, g, b, a;
gimp_rgba_set (&color, src[0], src[1], src[2], src[3]);
gimp_rgba_get_uchar (&color, &r, &g, &b, &a);
GIMP_CAIRO_ARGB32_SET_PIXEL(dest, r, g, b, a);
}
cairo_surface_mark_dirty (surface);
pattern = cairo_pattern_create_for_surface (surface);
cairo_pattern_set_extend (pattern, CAIRO_EXTEND_REFLECT);
cairo_surface_destroy (surface);
cairo_scale (cr, (gdouble) allocation.width / (gdouble) width, 1.0);
cairo_set_source (cr, pattern);
cairo_pattern_destroy (pattern);
cairo_paint (cr);
cairo_destroy (cr);
return FALSE;
}
static void
gimp_gradient_select_drag_data_received (GimpGradientSelectButton *button,
GdkDragContext *context,
gint x,
gint y,
GtkSelectionData *selection,
guint info,
guint time)
{
gint length = gtk_selection_data_get_length (selection);
gchar *str;
if (gtk_selection_data_get_format (selection) != 8 || length < 1)
{
g_warning ("%s: received invalid gradient data", G_STRFUNC);
return;
}
str = g_strndup ((const gchar *) gtk_selection_data_get_data (selection),
length);
if (g_utf8_validate (str, -1, NULL))
{
gint pid;
gpointer unused;
gint name_offset = 0;
if (sscanf (str, "%i:%p:%n", &pid, &unused, &name_offset) >= 2 &&
pid == gimp_getpid () && name_offset > 0)
{
gchar *name = str + name_offset;
gimp_gradient_select_button_set_gradient (button, name);
}
}
g_free (str);
}
static GtkWidget *
gimp_gradient_select_button_create_inside (GimpGradientSelectButton *gradient_button)
{
GtkWidget *button;
GimpGradientSelectButtonPrivate *priv;
priv = GIMP_GRADIENT_SELECT_BUTTON_GET_PRIVATE (gradient_button);
gtk_widget_push_composite_child ();
button = gtk_button_new ();
priv->preview = gtk_drawing_area_new ();
gtk_widget_set_size_request (priv->preview, CELL_WIDTH, CELL_HEIGHT);
gtk_container_add (GTK_CONTAINER (button), priv->preview);
g_signal_connect (priv->preview, "size-allocate",
G_CALLBACK (gimp_gradient_select_preview_size_allocate),
gradient_button);
g_signal_connect (priv->preview, "expose-event",
G_CALLBACK (gimp_gradient_select_preview_expose),
gradient_button);
gtk_widget_show_all (button);
g_signal_connect_swapped (button, "clicked",
G_CALLBACK (gimp_gradient_select_button_clicked),
gradient_button);
gtk_drag_dest_set (GTK_WIDGET (button),
GTK_DEST_DEFAULT_HIGHLIGHT |
GTK_DEST_DEFAULT_MOTION |
GTK_DEST_DEFAULT_DROP,
&target, 1,
GDK_ACTION_COPY);
g_signal_connect_swapped (button, "drag-data-received",
G_CALLBACK (gimp_gradient_select_drag_data_received),
gradient_button);
gtk_widget_pop_composite_child ();
return button;
}
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