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Diffstat (limited to 'app/widgets/gimpscalebutton.c')
| -rw-r--r-- | app/widgets/gimpscalebutton.c | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/app/widgets/gimpscalebutton.c b/app/widgets/gimpscalebutton.c new file mode 100644 index 0000000..7735316 --- /dev/null +++ b/app/widgets/gimpscalebutton.c @@ -0,0 +1,202 @@ +/* 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); +} |