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PIKApp/libpika/pikapatternchooser.c

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/* LIBPIKA - The PIKA Library
* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
*
* pikapatternchooser.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 "libpikawidgets/pikawidgets.h"
#include "pika.h"
#include "pikauitypes.h"
#include "pikapatternchooser.h"
#include "pikauimarshal.h"
#include "libpika-intl.h"
/**
* SECTION: pikapatternchooser
* @title: PikaPatternChooser
* @short_description: A button which pops up a pattern selection dialog.
*
* A button which pops up a pattern selection dialog.
*
* Note that this widget draws itself using `GEGL` code. You **must** call
* [func@Gegl.init] first to be able to use this chooser.
**/
#define CELL_SIZE 40
struct _PikaPatternChooser
{
PikaResourceChooser parent_instance;
GtkWidget *preview;
GtkWidget *popup;
PikaPattern *pattern;
GeglBuffer *buffer;
gint width;
gint height;
};
/* local */
static gboolean pika_pattern_select_on_preview_events (GtkWidget *widget,
GdkEvent *event,
PikaPatternChooser *button);
/* local drawing methods. */
static void pika_pattern_select_preview_fill_draw (PikaPatternChooser *chooser,
PikaPreviewArea *area);
static void pika_pattern_chooser_draw (PikaResourceChooser *self);
static void pika_pattern_chooser_get_pattern_image (PikaPatternChooser *self,
gint width,
gint height);
/* Popup methods. */
static void pika_pattern_chooser_open_popup (PikaPatternChooser *button,
gint x,
gint y);
static void pika_pattern_chooser_close_popup (PikaPatternChooser *button);
/* A GtkTargetEntry has a string and two ints.
* This is one, but we treat it as an array.
*/
static const GtkTargetEntry drag_target = { "application/x-pika-pattern-name", 0, 0 };
G_DEFINE_FINAL_TYPE (PikaPatternChooser, pika_pattern_chooser, PIKA_TYPE_RESOURCE_CHOOSER)
static void
pika_pattern_chooser_class_init (PikaPatternChooserClass *klass)
{
PikaResourceChooserClass *superclass = PIKA_RESOURCE_CHOOSER_CLASS (klass);
superclass->draw_interior = pika_pattern_chooser_draw;
superclass->resource_type = PIKA_TYPE_PATTERN;
}
static void
pika_pattern_chooser_init (PikaPatternChooser *self)
{
GtkWidget *frame;
GtkWidget *button;
frame = gtk_aspect_frame_new (NULL, 0.5, 0.5, 1.0, FALSE);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
gtk_box_pack_start (GTK_BOX (self), frame, FALSE, FALSE, 0);
gtk_widget_show (frame);
self->preview = pika_preview_area_new ();
gtk_widget_add_events (self->preview,
GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK);
gtk_widget_set_size_request (self->preview, CELL_SIZE, CELL_SIZE);
gtk_container_add (GTK_CONTAINER (frame), self->preview);
gtk_widget_show (self->preview);
g_signal_connect_swapped (self->preview, "size-allocate",
G_CALLBACK (pika_pattern_chooser_draw),
self);
g_signal_connect (self->preview, "event",
G_CALLBACK (pika_pattern_select_on_preview_events),
self);
button = gtk_button_new_with_mnemonic (_("_Browse..."));
gtk_box_pack_start (GTK_BOX (self), button, FALSE, FALSE, 0);
pika_resource_chooser_set_drag_target (PIKA_RESOURCE_CHOOSER (self),
self->preview, &drag_target);
pika_resource_chooser_set_clickable (PIKA_RESOURCE_CHOOSER (self), button);
gtk_widget_show (button);
}
/**
* pika_pattern_chooser_new:
* @title: (nullable): Title of the dialog to use or %NULL to use the default title.
* @label: (nullable): Button label or %NULL for no label.
* @resource: (nullable): Initial pattern.
*
* Creates a new #GtkWidget that lets a user choose a pattern.
* You can put this widget in a table in a plug-in dialog.
*
* When pattern is NULL, initial choice is from context.
*
* Returns: A #GtkWidget that you can use in your UI.
*
* Since: 2.4
*/
GtkWidget *
pika_pattern_chooser_new (const gchar *title,
const gchar *label,
PikaResource *resource)
{
GtkWidget *self;
if (resource == NULL)
resource = PIKA_RESOURCE (pika_context_get_pattern ());
g_return_val_if_fail (PIKA_IS_PATTERN (resource), NULL);
if (title)
self = g_object_new (PIKA_TYPE_PATTERN_CHOOSER,
"title", title,
"label", label,
"resource", resource,
NULL);
else
self = g_object_new (PIKA_TYPE_PATTERN_CHOOSER,
"label", label,
"resource", resource,
NULL);
pika_pattern_chooser_draw (PIKA_RESOURCE_CHOOSER (self));
return self;
}
static void
pika_pattern_chooser_draw (PikaResourceChooser *chooser)
{
PikaPatternChooser *pchooser = PIKA_PATTERN_CHOOSER (chooser);
GtkAllocation allocation;
gtk_widget_get_allocation (pchooser->preview, &allocation);
pika_pattern_chooser_get_pattern_image (pchooser, allocation.width, allocation.height);
pika_pattern_select_preview_fill_draw (pchooser, PIKA_PREVIEW_AREA (pchooser->preview));
}
static void
pika_pattern_chooser_get_pattern_image (PikaPatternChooser *chooser,
gint width,
gint height)
{
PikaPattern *pattern;
g_object_get (chooser, "resource", &pattern, NULL);
if (chooser->pattern == pattern &&
chooser->width == width &&
chooser->height == height)
{
/* Let's assume pattern contents is not changing in a single run. */
g_object_unref (pattern);
return;
}
g_clear_object (&chooser->buffer);
chooser->pattern = pattern;
chooser->buffer = pika_pattern_get_buffer (pattern, width, height, NULL);
chooser->width = gegl_buffer_get_width (chooser->buffer);
chooser->height = gegl_buffer_get_height (chooser->buffer);
g_object_unref (pattern);
}
/* On mouse events in self's preview, popup a zoom view of entire pattern */
static gboolean
pika_pattern_select_on_preview_events (GtkWidget *widget,
GdkEvent *event,
PikaPatternChooser *self)
{
GdkEventButton *bevent;
switch (event->type)
{
case GDK_BUTTON_PRESS:
bevent = (GdkEventButton *) event;
if (bevent->button == 1)
{
gtk_grab_add (widget);
pika_pattern_chooser_open_popup (self,
bevent->x, bevent->y);
}
break;
case GDK_BUTTON_RELEASE:
bevent = (GdkEventButton *) event;
if (bevent->button == 1)
{
gtk_grab_remove (widget);
pika_pattern_chooser_close_popup (self);
}
break;
default:
break;
}
return FALSE;
}
/* Fill a PikaPreviewArea with a image then draw. */
static void
pika_pattern_select_preview_fill_draw (PikaPatternChooser *chooser,
PikaPreviewArea *area)
{
GeglBuffer *src_buffer;
const Babl *format;
const Babl *model;
guchar *src;
PikaImageType type;
gint rowstride;
GtkAllocation allocation;
gint x = 0;
gint y = 0;
gtk_widget_get_allocation (GTK_WIDGET (area), &allocation);
/* Fill with white. */
if (chooser->width < allocation.width ||
chooser->height < allocation.height)
{
pika_preview_area_fill (area,
0, 0,
allocation.width,
allocation.height,
0xFF, 0xFF, 0xFF);
x = ((allocation.width - chooser->width) / 2);
y = ((allocation.height - chooser->height) / 2);
}
/* Draw the pattern. */
src_buffer = chooser->buffer;
format = gegl_buffer_get_format (src_buffer);
rowstride = chooser->width * babl_format_get_bytes_per_pixel (format);
model = babl_format_get_model (format);
if (model == babl_model ("R'G'B'"))
type = PIKA_RGB_IMAGE;
else if (model == babl_model ("R'G'B'A"))
type = PIKA_RGBA_IMAGE;
else if (model == babl_model ("Y'"))
type = PIKA_GRAY_IMAGE;
else if (model == babl_model ("Y'A"))
type = PIKA_GRAYA_IMAGE;
else
/* I just know that we can't have other formats because I set it up this way
* in pika_pattern_get_buffer(). If we make the latter more generic, able to
* return more types of pixel data, this should be reviewed. XXX
*/
g_return_if_reached ();
src = g_try_malloc (sizeof (guchar) * rowstride * chooser->height);
gegl_buffer_get (chooser->buffer, NULL, 1.0, format, src, GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
pika_preview_area_draw (area, x, y, chooser->width, chooser->height, type, src, rowstride);
g_free (src);
}
/* popup methods. */
static void
pika_pattern_chooser_open_popup (PikaPatternChooser *chooser,
gint x,
gint y)
{
GtkWidget *frame;
GtkWidget *preview;
GdkMonitor *monitor;
GdkRectangle workarea;
gint x_org;
gint y_org;
if (chooser->popup)
pika_pattern_chooser_close_popup (chooser);
if (chooser->width <= CELL_SIZE && chooser->height <= CELL_SIZE)
return;
chooser->popup = gtk_window_new (GTK_WINDOW_POPUP);
gtk_window_set_type_hint (GTK_WINDOW (chooser->popup), GDK_WINDOW_TYPE_HINT_DND);
gtk_window_set_screen (GTK_WINDOW (chooser->popup),
gtk_widget_get_screen (GTK_WIDGET (chooser)));
frame = gtk_frame_new (NULL);
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_OUT);
gtk_container_add (GTK_CONTAINER (chooser->popup), frame);
gtk_widget_show (frame);
preview = pika_preview_area_new ();
gtk_widget_set_size_request (preview, chooser->width, chooser->height);
gtk_container_add (GTK_CONTAINER (frame), preview);
gtk_widget_show (preview);
/* decide where to put the popup: near the preview i.e. at mousedown coords */
gdk_window_get_origin (gtk_widget_get_window (chooser->preview),
&x_org, &y_org);
monitor = pika_widget_get_monitor (GTK_WIDGET (chooser));
gdk_monitor_get_workarea (monitor, &workarea);
x = x_org + x - (chooser->width / 2);
y = y_org + y - (chooser->height / 2);
x = CLAMP (x, workarea.x, workarea.x + workarea.width - chooser->width);
y = CLAMP (y, workarea.y, workarea.y + workarea.height - chooser->height);
gtk_window_move (GTK_WINDOW (chooser->popup), x, y);
gtk_widget_show (chooser->popup);
/* Draw popup now. Usual events do not cause a draw. */
pika_pattern_select_preview_fill_draw (chooser, PIKA_PREVIEW_AREA (preview));
}
static void
pika_pattern_chooser_close_popup (PikaPatternChooser *self)
{
g_clear_pointer (&self->popup, gtk_widget_destroy);
}
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