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-rw-r--r--app/widgets/gimpscalebutton.c202
1 files changed, 202 insertions, 0 deletions
diff --git a/app/widgets/gimpscalebutton.c b/app/widgets/gimpscalebutton.c
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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);
+}