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gimp/libgimpwidgets/gimpoffsetarea.c

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/* LIBGIMP - The GIMP Library
* Copyright (C) 1995-1997 Peter Mattis and Spencer Kimball
*
* gimpoffsetarea.c
* Copyright (C) 2001 Sven Neumann <sven@gimp.org>
*
* 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
* 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
* <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gtk/gtk.h>
#include "gimpwidgetstypes.h"
#include "gimpwidgetsmarshal.h"
#include "gimpoffsetarea.h"
/**
* SECTION: gimpoffsetarea
* @title: GimpOffsetArea
* @short_description: Widget to control image offsets.
*
* Widget to control image offsets.
**/
#define DRAWING_AREA_SIZE 200
enum
{
OFFSETS_CHANGED,
LAST_SIGNAL
};
static void gimp_offset_area_resize (GimpOffsetArea *area);
static void gimp_offset_area_realize (GtkWidget *widget);
static void gimp_offset_area_size_allocate (GtkWidget *widget,
GtkAllocation *allocation);
static gboolean gimp_offset_area_event (GtkWidget *widget,
GdkEvent *event);
static gboolean gimp_offset_area_expose_event (GtkWidget *widget,
GdkEventExpose *eevent);
G_DEFINE_TYPE (GimpOffsetArea, gimp_offset_area, GTK_TYPE_DRAWING_AREA)
#define parent_class gimp_offset_area_parent_class
static guint gimp_offset_area_signals[LAST_SIGNAL] = { 0 };
static void
gimp_offset_area_class_init (GimpOffsetAreaClass *klass)
{
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
gimp_offset_area_signals[OFFSETS_CHANGED] =
g_signal_new ("offsets-changed",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_FIRST,
G_STRUCT_OFFSET (GimpOffsetAreaClass, offsets_changed),
NULL, NULL,
_gimp_widgets_marshal_VOID__INT_INT,
G_TYPE_NONE, 2,
G_TYPE_INT,
G_TYPE_INT);
widget_class->size_allocate = gimp_offset_area_size_allocate;
widget_class->realize = gimp_offset_area_realize;
widget_class->event = gimp_offset_area_event;
widget_class->expose_event = gimp_offset_area_expose_event;
}
static void
gimp_offset_area_init (GimpOffsetArea *area)
{
area->orig_width = 0;
area->orig_height = 0;
area->width = 0;
area->height = 0;
area->offset_x = 0;
area->offset_y = 0;
area->display_ratio_x = 1.0;
area->display_ratio_y = 1.0;
gtk_widget_add_events (GTK_WIDGET (area),
GDK_BUTTON_PRESS_MASK |
GDK_BUTTON_RELEASE_MASK |
GDK_BUTTON1_MOTION_MASK);
}
/**
* gimp_offset_area_new:
* @orig_width: the original width
* @orig_height: the original height
*
* Creates a new #GimpOffsetArea widget. A #GimpOffsetArea can be used
* when resizing an image or a drawable to allow the user to interactively
* specify the new offsets.
*
* Return value: the new #GimpOffsetArea widget.
**/
GtkWidget *
gimp_offset_area_new (gint orig_width,
gint orig_height)
{
GimpOffsetArea *area;
g_return_val_if_fail (orig_width > 0, NULL);
g_return_val_if_fail (orig_height > 0, NULL);
area = g_object_new (GIMP_TYPE_OFFSET_AREA, NULL);
area->orig_width = area->width = orig_width;
area->orig_height = area->height = orig_height;
gimp_offset_area_resize (area);
return GTK_WIDGET (area);
}
/**
* gimp_offset_area_set_pixbuf:
* @offset_area: a #GimpOffsetArea.
* @pixbuf: a #GdkPixbuf.
*
* Sets the pixbuf which represents the original image/drawable which
* is being offset.
*
* Since: 2.2
**/
void
gimp_offset_area_set_pixbuf (GimpOffsetArea *area,
GdkPixbuf *pixbuf)
{
g_return_if_fail (GIMP_IS_OFFSET_AREA (area));
g_return_if_fail (GDK_IS_PIXBUF (pixbuf));
g_object_set_data_full (G_OBJECT (area), "pixbuf",
gdk_pixbuf_copy (pixbuf),
(GDestroyNotify) g_object_unref);
gtk_widget_queue_draw (GTK_WIDGET (area));
}
/**
* gimp_offset_area_set_size:
* @offset_area: a #GimpOffsetArea.
* @width: the new width
* @height: the new height
*
* Sets the size of the image/drawable displayed by the #GimpOffsetArea.
* If the offsets change as a result of this change, the "offsets-changed"
* signal is emitted.
**/
void
gimp_offset_area_set_size (GimpOffsetArea *area,
gint width,
gint height)
{
g_return_if_fail (GIMP_IS_OFFSET_AREA (area));
g_return_if_fail (width > 0 && height > 0);
if (area->width != width || area->height != height)
{
gint offset_x;
gint offset_y;
area->width = width;
area->height = height;
if (area->orig_width <= area->width)
offset_x = CLAMP (area->offset_x, 0, area->width - area->orig_width);
else
offset_x = CLAMP (area->offset_x, area->width - area->orig_width, 0);
if (area->orig_height <= area->height)
offset_y = CLAMP (area->offset_y, 0, area->height - area->orig_height);
else
offset_y = CLAMP (area->offset_y, area->height - area->orig_height, 0);
if (offset_x != area->offset_x || offset_y != area->offset_y)
{
area->offset_x = offset_x;
area->offset_y = offset_y;
g_signal_emit (area,
gimp_offset_area_signals[OFFSETS_CHANGED], 0,
offset_x, offset_y);
}
gimp_offset_area_resize (area);
}
}
/**
* gimp_offset_area_set_offsets:
* @offset_area: a #GimpOffsetArea.
* @offset_x: the X offset
* @offset_y: the Y offset
*
* Sets the offsets of the image/drawable displayed by the #GimpOffsetArea.
* It does not emit the "offsets-changed" signal.
**/
void
gimp_offset_area_set_offsets (GimpOffsetArea *area,
gint offset_x,
gint offset_y)
{
g_return_if_fail (GIMP_IS_OFFSET_AREA (area));
if (area->offset_x != offset_x || area->offset_y != offset_y)
{
if (area->orig_width <= area->width)
area->offset_x = CLAMP (offset_x, 0, area->width - area->orig_width);
else
area->offset_x = CLAMP (offset_x, area->width - area->orig_width, 0);
if (area->orig_height <= area->height)
area->offset_y = CLAMP (offset_y, 0, area->height - area->orig_height);
else
area->offset_y = CLAMP (offset_y, area->height - area->orig_height, 0);
gtk_widget_queue_draw (GTK_WIDGET (area));
}
}
static void
gimp_offset_area_resize (GimpOffsetArea *area)
{
gint width;
gint height;
gdouble ratio;
if (area->orig_width == 0 || area->orig_height == 0)
return;
if (area->orig_width <= area->width)
width = area->width;
else
width = area->orig_width * 2 - area->width;
if (area->orig_height <= area->height)
height = area->height;
else
height = area->orig_height * 2 - area->height;
ratio = (gdouble) DRAWING_AREA_SIZE / (gdouble) MAX (width, height);
width = ratio * (gdouble) width;
height = ratio * (gdouble) height;
gtk_widget_set_size_request (GTK_WIDGET (area), width, height);
gtk_widget_queue_resize (GTK_WIDGET (area));
}
static void
gimp_offset_area_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GimpOffsetArea *area = GIMP_OFFSET_AREA (widget);
GdkPixbuf *pixbuf;
GTK_WIDGET_CLASS (parent_class)->size_allocate (widget, allocation);
area->display_ratio_x = ((gdouble) allocation->width /
((area->orig_width <= area->width) ?
area->width :
area->orig_width * 2 - area->width));
area->display_ratio_y = ((gdouble) allocation->height /
((area->orig_height <= area->height) ?
area->height :
area->orig_height * 2 - area->height));
pixbuf = g_object_get_data (G_OBJECT (area), "pixbuf");
if (pixbuf)
{
GdkPixbuf *copy;
gint pixbuf_width;
gint pixbuf_height;
pixbuf_width = area->display_ratio_x * area->orig_width;
pixbuf_width = MAX (pixbuf_width, 1);
pixbuf_height = area->display_ratio_y * area->orig_height;
pixbuf_height = MAX (pixbuf_height, 1);
copy = g_object_get_data (G_OBJECT (area), "pixbuf-copy");
if (copy &&
(pixbuf_width != gdk_pixbuf_get_width (copy) ||
pixbuf_height != gdk_pixbuf_get_height (copy)))
{
copy = NULL;
}
if (! copy)
{
copy = gdk_pixbuf_scale_simple (pixbuf, pixbuf_width, pixbuf_height,
GDK_INTERP_NEAREST);
g_object_set_data_full (G_OBJECT (area), "pixbuf-copy",
copy, (GDestroyNotify) g_object_unref);
}
}
}
static void
gimp_offset_area_realize (GtkWidget *widget)
{
GdkCursor *cursor;
GTK_WIDGET_CLASS (parent_class)->realize (widget);
cursor = gdk_cursor_new_for_display (gtk_widget_get_display (widget),
GDK_FLEUR);
gdk_window_set_cursor (gtk_widget_get_window (widget), cursor);
gdk_cursor_unref (cursor);
}
static gboolean
gimp_offset_area_event (GtkWidget *widget,
GdkEvent *event)
{
static gint orig_offset_x = 0;
static gint orig_offset_y = 0;
static gint start_x = 0;
static gint start_y = 0;
GimpOffsetArea *area = GIMP_OFFSET_AREA (widget);
gint offset_x;
gint offset_y;
if (area->orig_width == 0 || area->orig_height == 0)
return FALSE;
switch (event->type)
{
case GDK_BUTTON_PRESS:
if (event->button.button == 1)
{
gtk_grab_add (widget);
orig_offset_x = area->offset_x;
orig_offset_y = area->offset_y;
start_x = event->button.x;
start_y = event->button.y;
}
break;
case GDK_MOTION_NOTIFY:
offset_x = (orig_offset_x +
(event->motion.x - start_x) / area->display_ratio_x);
offset_y = (orig_offset_y +
(event->motion.y - start_y) / area->display_ratio_y);
if (area->offset_x != offset_x || area->offset_y != offset_y)
{
gimp_offset_area_set_offsets (area, offset_x, offset_y);
g_signal_emit (area,
gimp_offset_area_signals[OFFSETS_CHANGED], 0,
area->offset_x, area->offset_y);
}
break;
case GDK_BUTTON_RELEASE:
if (event->button.button == 1)
{
gtk_grab_remove (widget);
start_x = start_y = 0;
}
break;
default:
return FALSE;
}
return TRUE;
}
static gboolean
gimp_offset_area_expose_event (GtkWidget *widget,
GdkEventExpose *eevent)
{
GimpOffsetArea *area = GIMP_OFFSET_AREA (widget);
GtkStyle *style = gtk_widget_get_style (widget);
GdkWindow *window = gtk_widget_get_window (widget);
cairo_t *cr;
GtkAllocation allocation;
GdkPixbuf *pixbuf;
gint w, h;
gint x, y;
cr = gdk_cairo_create (eevent->window);
gdk_cairo_region (cr, eevent->region);
cairo_clip (cr);
gtk_widget_get_allocation (widget, &allocation);
x = (area->display_ratio_x *
((area->orig_width <= area->width) ?
area->offset_x :
area->offset_x + area->orig_width - area->width));
y = (area->display_ratio_y *
((area->orig_height <= area->height) ?
area->offset_y :
area->offset_y + area->orig_height - area->height));
w = area->display_ratio_x * area->orig_width;
w = MAX (w, 1);
h = area->display_ratio_y * area->orig_height;
h = MAX (h, 1);
pixbuf = g_object_get_data (G_OBJECT (widget), "pixbuf-copy");
if (pixbuf)
{
gdk_cairo_set_source_pixbuf (cr, pixbuf, x, y);
cairo_paint (cr);
cairo_rectangle (cr, x + 0.5, y + 0.5, w - 1, h - 1);
cairo_set_line_width (cr, 1.0);
gdk_cairo_set_source_color (cr, &style->black);
cairo_stroke (cr);
}
else
{
gtk_paint_shadow (style, window, GTK_STATE_NORMAL,
GTK_SHADOW_OUT,
NULL, widget, NULL,
x, y, w, h);
}
if (area->orig_width > area->width || area->orig_height > area->height)
{
gint line_width;
if (area->orig_width > area->width)
{
x = area->display_ratio_x * (area->orig_width - area->width);
w = area->display_ratio_x * area->width;
}
else
{
x = -1;
w = allocation.width + 2;
}
if (area->orig_height > area->height)
{
y = area->display_ratio_y * (area->orig_height - area->height);
h = area->display_ratio_y * area->height;
}
else
{
y = -1;
h = allocation.height + 2;
}
w = MAX (w, 1);
h = MAX (h, 1);
line_width = MIN (3, MIN (w, h));
cairo_rectangle (cr,
x + line_width / 2.0,
y + line_width / 2.0,
MAX (w - line_width, 1),
MAX (h - line_width, 1));
cairo_set_line_width (cr, line_width);
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);
}
cairo_destroy (cr);
return FALSE;
}
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