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gimp/app/widgets/gimpoverlayframe.c

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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimpoverlayframe.c
* Copyright (C) 2010 Michael Natterer <mitch@gimp.org>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gtk/gtk.h>
#include "libgimpmath/gimpmath.h"
#include "widgets-types.h"
#include "gimpoverlayframe.h"
#include "gimpwidgets-utils.h"
static void gimp_overlay_frame_size_request (GtkWidget *widget,
GtkRequisition *requisition);
static void gimp_overlay_frame_size_allocate (GtkWidget *widget,
GtkAllocation *allocation);
static gboolean gimp_overlay_frame_expose (GtkWidget *widget,
GdkEventExpose *eevent);
G_DEFINE_TYPE (GimpOverlayFrame, gimp_overlay_frame, GTK_TYPE_BIN)
#define parent_class gimp_overlay_frame_parent_class
static void
gimp_overlay_frame_class_init (GimpOverlayFrameClass *klass)
{
GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
widget_class->size_request = gimp_overlay_frame_size_request;
widget_class->size_allocate = gimp_overlay_frame_size_allocate;
widget_class->expose_event = gimp_overlay_frame_expose;
}
static void
gimp_overlay_frame_init (GimpOverlayFrame *frame)
{
gtk_widget_set_app_paintable (GTK_WIDGET (frame), TRUE);
}
static void
gimp_overlay_frame_size_request (GtkWidget *widget,
GtkRequisition *requisition)
{
GtkWidget *child = gtk_bin_get_child (GTK_BIN (widget));
GtkRequisition child_requisition;
gint border_width;
border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
requisition->width = border_width * 2;
requisition->height = border_width * 2;
if (child && gtk_widget_get_visible (child))
{
gtk_widget_size_request (child, &child_requisition);
}
else
{
child_requisition.width = 0;
child_requisition.height = 0;
}
requisition->width += child_requisition.width;
requisition->height += child_requisition.height;
}
static void
gimp_overlay_frame_size_allocate (GtkWidget *widget,
GtkAllocation *allocation)
{
GtkWidget *child = gtk_bin_get_child (GTK_BIN (widget));
GtkAllocation child_allocation;
gint border_width;
gtk_widget_set_allocation (widget, allocation);
border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
if (child && gtk_widget_get_visible (child))
{
child_allocation.x = allocation->x + border_width;
child_allocation.y = allocation->y + border_width;
child_allocation.width = MAX (allocation->width - 2 * border_width, 0);
child_allocation.height = MAX (allocation->height - 2 * border_width, 0);
gtk_widget_size_allocate (child, &child_allocation);
}
}
static gboolean
gimp_overlay_frame_expose (GtkWidget *widget,
GdkEventExpose *eevent)
{
cairo_t *cr = gdk_cairo_create (gtk_widget_get_window (widget));
GtkStyle *style = gtk_widget_get_style (widget);
gboolean rgba;
rgba = gdk_screen_get_rgba_colormap (gtk_widget_get_screen (widget)) != NULL;
if (rgba)
{
cairo_set_operator (cr, CAIRO_OPERATOR_CLEAR);
gdk_cairo_region (cr, eevent->region);
cairo_clip_preserve (cr);
cairo_fill (cr);
}
cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
gdk_cairo_set_source_color (cr, &style->bg[GTK_STATE_NORMAL]);
if (rgba)
{
GtkAllocation allocation;
gint border_width;
gtk_widget_get_allocation (widget, &allocation);
border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
#define DEG_TO_RAD(deg) ((deg) * (G_PI / 180.0))
cairo_arc (cr,
border_width,
border_width,
border_width,
DEG_TO_RAD (180),
DEG_TO_RAD (270));
cairo_line_to (cr,
allocation.width - border_width,
0);
cairo_arc (cr,
allocation.width - border_width,
border_width,
border_width,
DEG_TO_RAD (270),
DEG_TO_RAD (0));
cairo_line_to (cr,
allocation.width,
allocation.height - border_width);
cairo_arc (cr,
allocation.width - border_width,
allocation.height - border_width,
border_width,
DEG_TO_RAD (0),
DEG_TO_RAD (90));
cairo_line_to (cr,
border_width,
allocation.height);
cairo_arc (cr,
border_width,
allocation.height - border_width,
border_width,
DEG_TO_RAD (90),
DEG_TO_RAD (180));
cairo_close_path (cr);
cairo_clip (cr);
}
/* #define BLING 1 */
#ifdef BLING
{
GtkAllocation allocation;
cairo_pattern_t *gradient;
GimpRGB color;
gdouble x0, y0;
gdouble x1, y1;
gdouble w, h;
gdouble d, n;
gtk_widget_get_allocation (widget, &allocation);
w = allocation.width - allocation.x;
h = allocation.height - allocation.y;
d = sqrt (SQR (w) + SQR (h));
n = w * h / d;
x0 = allocation.x + w / 2 - h * (n / d);
y0 = allocation.y + h / 2 - w * (n / d);
x1 = allocation.x + w / 2 + h * (n / d);
y1 = allocation.y + h / 2 + w * (n / d);
gradient = cairo_pattern_create_linear (x0, y0, x1, y1);
gimp_rgb_set_gdk_color (&color, &style->bg[GTK_STATE_NORMAL]);
cairo_pattern_add_color_stop_rgba (gradient,
0.0,
color.r,
color.g,
color.b,
1.0);
cairo_pattern_add_color_stop_rgba (gradient,
1.0,
color.r,
color.g,
color.b,
1.0);
gimp_rgb_set_gdk_color (&color, &style->bg[GTK_STATE_SELECTED]);
cairo_pattern_add_color_stop_rgba (gradient,
0.5,
color.r,
color.g,
color.b,
1.0);
cairo_set_source (cr, gradient);
cairo_pattern_destroy (gradient);
}
#endif /* BLING */
cairo_paint (cr);
cairo_destroy (cr);
return GTK_WIDGET_CLASS (parent_class)->expose_event (widget, eevent);
}
GtkWidget *
gimp_overlay_frame_new (void)
{
return g_object_new (GIMP_TYPE_OVERLAY_FRAME, NULL);
}
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