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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimpscalebutton.c
* Copyright (C) 2008 Sven Neumann <sven@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 <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gtk/gtk.h>
#include "widgets-types.h"
#include "gimpscalebutton.h"
static void gimp_scale_button_value_changed (GtkScaleButton *button,
gdouble value);
static void gimp_scale_button_update_tooltip (GimpScaleButton *button);
static gboolean gimp_scale_button_image_expose (GtkWidget *widget,
GdkEventExpose *event,
GimpScaleButton *button);
G_DEFINE_TYPE (GimpScaleButton, gimp_scale_button, GTK_TYPE_SCALE_BUTTON)
#define parent_class gimp_scale_button_parent_class
static void
gimp_scale_button_class_init (GimpScaleButtonClass *klass)
{
GtkScaleButtonClass *button_class = GTK_SCALE_BUTTON_CLASS (klass);
button_class->value_changed = gimp_scale_button_value_changed;
}
static void
gimp_scale_button_init (GimpScaleButton *button)
{
GtkWidget *image = gtk_bin_get_child (GTK_BIN (button));
GtkWidget *plusminus;
plusminus = gtk_scale_button_get_plus_button (GTK_SCALE_BUTTON (button));
gtk_widget_hide (plusminus);
gtk_widget_set_no_show_all (plusminus, TRUE);
plusminus = gtk_scale_button_get_minus_button (GTK_SCALE_BUTTON (button));
gtk_widget_hide (plusminus);
gtk_widget_set_no_show_all (plusminus, TRUE);
g_signal_connect (image, "expose-event",
G_CALLBACK (gimp_scale_button_image_expose),
button);
/* GtkScaleButton doesn't emit "value-changed" when the adjustment changes */
g_signal_connect (button, "notify::adjustment",
G_CALLBACK (gimp_scale_button_update_tooltip),
NULL);
gimp_scale_button_update_tooltip (button);
}
static void
gimp_scale_button_value_changed (GtkScaleButton *button,
gdouble value)
{
if (GTK_SCALE_BUTTON_CLASS (parent_class)->value_changed)
GTK_SCALE_BUTTON_CLASS (parent_class)->value_changed (button, value);
gimp_scale_button_update_tooltip (GIMP_SCALE_BUTTON (button));
}
static void
gimp_scale_button_update_tooltip (GimpScaleButton *button)
{
GtkAdjustment *adj;
gchar *text;
gdouble value;
gdouble lower;
gdouble upper;
adj = gtk_scale_button_get_adjustment (GTK_SCALE_BUTTON (button));
value = gtk_adjustment_get_value (adj);
lower = gtk_adjustment_get_lower (adj);
upper = gtk_adjustment_get_upper (adj);
/* use U+2009 THIN SPACE to separate the percent sign from the number */
text = g_strdup_printf ("%d\342\200\211%%",
(gint) (0.5 + ((value - lower) * 100.0 /
(upper - lower))));
gtk_widget_set_tooltip_text (GTK_WIDGET (button), text);
g_free (text);
}
static gboolean
gimp_scale_button_image_expose (GtkWidget *widget,
GdkEventExpose *event,
GimpScaleButton *button)
{
GtkStyle *style = gtk_widget_get_style (widget);
GtkAllocation allocation;
GtkAdjustment *adj;
cairo_t *cr;
gint value;
gint steps;
gint i;
gtk_widget_get_allocation (widget, &allocation);
steps = MIN (allocation.width, allocation.height) / 2;
adj = gtk_scale_button_get_adjustment (GTK_SCALE_BUTTON (button));
if (steps < 1)
return TRUE;
value = 0.5 + ((gtk_adjustment_get_value (adj) -
gtk_adjustment_get_lower (adj)) * (gdouble) steps /
(gtk_adjustment_get_upper (adj) -
gtk_adjustment_get_lower (adj)));
cr = gdk_cairo_create (gtk_widget_get_window (widget));
gdk_cairo_rectangle (cr, &event->area);
cairo_clip (cr);
cairo_set_line_width (cr, 0.5);
if (gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL)
{
cairo_translate (cr,
allocation.x + allocation.width - 0.5,
allocation.y + allocation.height);
cairo_scale (cr, -2.0, -2.0);
}
else
{
cairo_translate (cr,
allocation.x + 0.5,
allocation.y + allocation.height);
cairo_scale (cr, 2.0, -2.0);
}
for (i = 0; i < value; i++)
{
cairo_move_to (cr, i, 0);
cairo_line_to (cr, i, i + 0.5);
}
gdk_cairo_set_source_color (cr, &style->fg[gtk_widget_get_state (widget)]);
cairo_stroke (cr);
for ( ; i < steps; i++)
{
cairo_move_to (cr, i, 0);
cairo_line_to (cr, i, i + 0.5);
}
gdk_cairo_set_source_color (cr, &style->fg[GTK_STATE_INSENSITIVE]);
cairo_stroke (cr);
cairo_destroy (cr);
return TRUE;
}
GtkWidget *
gimp_scale_button_new (gdouble value,
gdouble min,
gdouble max)
{
GtkObject *adj;
gdouble step;
g_return_val_if_fail (value >= min && value <= max, NULL);
step = (max - min) / 10.0;
adj = gtk_adjustment_new (value, min, max, step, step, 0);
return g_object_new (GIMP_TYPE_SCALE_BUTTON,
"orientation", GTK_ORIENTATION_HORIZONTAL,
"adjustment", adj,
"size", GTK_ICON_SIZE_MENU,
NULL);
}
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