Merge branch 'michal-wip'

1 files changed, 880 insertions, 0 deletions

diff --git a/mate-volume-control/gvc-level-bar.c b/mate-volume-control/gvc-level-bar.c
new file mode 100644
index 0000000..9a67c1d
--- /dev/null
+++ b/mate-volume-control/gvc-level-bar.c
@@ -0,0 +1,880 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
+ *
+ * Copyright (C) 2008 William Jon McCann <[email protected]>
+ * Copyright (C) 2014 Michal Ratajsky <[email protected]>
+ *
+ * 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 2 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#include <math.h>
+#include <glib.h>
+#include <glib/gi18n.h>
+#include <glib-object.h>
+#include <gtk/gtk.h>
+
+#define MATE_DESKTOP_USE_UNSTABLE_API
+#include <libmate-desktop/mate-desktop-utils.h>
+
+#include "gvc-level-bar.h"
+#include "gvc-utils.h"
+
+#define GVC_LEVEL_BAR_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), GVC_TYPE_LEVEL_BAR, GvcLevelBarPrivate))
+
+#define NUM_BOXES                  15
+#define MIN_HORIZONTAL_BAR_WIDTH   150
+#define HORIZONTAL_BAR_HEIGHT      6
+#define VERTICAL_BAR_WIDTH         6
+#define MIN_VERTICAL_BAR_HEIGHT    400
+
+typedef struct {
+        int            peak_num;
+        int            max_peak_num;
+        GdkRectangle   area;
+        int            delta;
+        int            box_width;
+        int            box_height;
+        int            box_radius;
+#if GTK_CHECK_VERSION (3, 0, 0)
+        GdkRGBA        color_bg;
+        GdkRGBA        color_fg;
+        GdkRGBA        color_dark;
+#else
+        GdkColor       color_bg;
+        GdkColor       color_fg;
+        GdkColor       color_dark;
+#endif
+} LevelBarLayout;
+
+struct _GvcLevelBarPrivate
+{
+        GtkOrientation orientation;
+        GtkAdjustment *peak_adjustment;
+        GtkAdjustment *rms_adjustment;
+        GvcLevelScale  scale;
+        gdouble        peak_fraction;
+        gdouble        rms_fraction;
+        gdouble        max_peak;
+        guint          max_peak_id;
+        LevelBarLayout layout;
+};
+
+enum
+{
+        PROP_0,
+        PROP_PEAK_ADJUSTMENT,
+        PROP_RMS_ADJUSTMENT,
+        PROP_SCALE,
+        PROP_ORIENTATION,
+        N_PROPERTIES
+};
+
+static GParamSpec *properties[N_PROPERTIES] = { NULL, };
+
+static void gvc_level_bar_class_init (GvcLevelBarClass *klass);
+static void gvc_level_bar_init       (GvcLevelBar      *bar);
+static void gvc_level_bar_finalize   (GObject          *object);
+
+G_DEFINE_TYPE (GvcLevelBar, gvc_level_bar, GTK_TYPE_WIDGET)
+
+static gboolean
+layout_changed (LevelBarLayout *layout1, LevelBarLayout *layout2)
+{
+        if (layout1->area.x != layout2->area.x)
+                return TRUE;
+        if (layout1->area.y != layout2->area.y)
+                return TRUE;
+        if (layout1->area.width != layout2->area.width)
+                return TRUE;
+        if (layout1->area.height != layout2->area.height)
+                return TRUE;
+
+        if (layout1->delta != layout2->delta)
+                return TRUE;
+        if (layout1->peak_num != layout2->peak_num)
+                return TRUE;
+        if (layout1->max_peak_num != layout2->max_peak_num)
+                return TRUE;
+
+#if GTK_CHECK_VERSION (3, 0, 0)
+        if (!gdk_rgba_equal (&layout1->color_fg, &layout2->color_fg))
+                return TRUE;
+        if (!gdk_rgba_equal (&layout1->color_bg, &layout2->color_bg))
+                return TRUE;
+        if (!gdk_rgba_equal (&layout1->color_dark, &layout2->color_dark))
+                return TRUE;
+#else
+        if (!gdk_color_equal (&layout1->color_fg, &layout2->color_fg))
+                return TRUE;
+        if (!gdk_color_equal (&layout1->color_bg, &layout2->color_bg))
+                return TRUE;
+        if (!gdk_color_equal (&layout1->color_dark, &layout2->color_dark))
+                return TRUE;
+#endif
+        return FALSE;
+}
+
+static gdouble
+fraction_from_adjustment (GvcLevelBar   *bar,
+                          GtkAdjustment *adjustment)
+{
+        gdouble level;
+        gdouble fraction = 0.0;
+        gdouble min;
+        gdouble max;
+
+        level = gtk_adjustment_get_value (adjustment);
+        min   = gtk_adjustment_get_lower (adjustment);
+        max   = gtk_adjustment_get_upper (adjustment);
+
+        switch (bar->priv->scale) {
+        case GVC_LEVEL_SCALE_LINEAR:
+                fraction = (level - min) / (max - min);
+                break;
+        case GVC_LEVEL_SCALE_LOG:
+                fraction = log10 ((level - min + 1) / (max - min + 1));
+                break;
+        }
+
+        return fraction;
+}
+
+static gboolean
+reset_max_peak (GvcLevelBar *bar)
+{
+        bar->priv->max_peak = gtk_adjustment_get_lower (bar->priv->peak_adjustment);
+
+        bar->priv->layout.max_peak_num = 0;
+
+        gtk_widget_queue_draw (GTK_WIDGET (bar));
+
+        bar->priv->max_peak_id = 0;
+        return FALSE;
+}
+
+static void
+bar_calc_layout (GvcLevelBar *bar)
+{
+        int           peak_level;
+        int           max_peak_level;
+        GtkAllocation allocation;
+
+#if GTK_CHECK_VERSION (3, 0, 0)
+        GtkStyleContext *context;
+
+        context = gtk_widget_get_style_context (GTK_WIDGET (bar));
+
+        gtk_style_context_get_background_color (context,
+                                                GTK_STATE_FLAG_NORMAL,
+                                                &bar->priv->layout.color_bg);
+        gtk_style_context_get_background_color (context,
+                                                GTK_STATE_FLAG_SELECTED,
+                                                &bar->priv->layout.color_fg);
+
+        mate_desktop_gtk_style_get_dark_color (context,
+                                               GTK_STATE_FLAG_NORMAL,
+                                               &bar->priv->layout.color_dark);
+#else
+        GtkStyle *style;
+
+        style = gtk_widget_get_style (GTK_WIDGET (bar));
+
+        bar->priv->layout.color_bg   = style->bg[GTK_STATE_NORMAL];
+        bar->priv->layout.color_fg   = style->bg[GTK_STATE_SELECTED];
+        bar->priv->layout.color_dark = style->dark[GTK_STATE_NORMAL];
+#endif
+
+        gtk_widget_get_allocation (GTK_WIDGET (bar), &allocation);
+
+        bar->priv->layout.area.width = allocation.width - 2;
+        bar->priv->layout.area.height = allocation.height - 2;
+
+        if (bar->priv->orientation == GTK_ORIENTATION_VERTICAL) {
+                peak_level = bar->priv->peak_fraction * bar->priv->layout.area.height;
+                max_peak_level = bar->priv->max_peak * bar->priv->layout.area.height;
+
+                bar->priv->layout.delta = bar->priv->layout.area.height / NUM_BOXES;
+                bar->priv->layout.area.x = 0;
+                bar->priv->layout.area.y = 0;
+                bar->priv->layout.box_height = bar->priv->layout.delta / 2;
+                bar->priv->layout.box_width  = bar->priv->layout.area.width;
+                bar->priv->layout.box_radius = bar->priv->layout.box_width / 2;
+        } else {
+                peak_level = bar->priv->peak_fraction * bar->priv->layout.area.width;
+                max_peak_level = bar->priv->max_peak * bar->priv->layout.area.width;
+
+                bar->priv->layout.delta = bar->priv->layout.area.width / NUM_BOXES;
+                bar->priv->layout.area.x = 0;
+                bar->priv->layout.area.y = 0;
+                bar->priv->layout.box_width  = bar->priv->layout.delta / 2;
+                bar->priv->layout.box_height = bar->priv->layout.area.height;
+                bar->priv->layout.box_radius = bar->priv->layout.box_height / 2;
+        }
+
+        bar->priv->layout.peak_num = peak_level / bar->priv->layout.delta;
+        bar->priv->layout.max_peak_num = max_peak_level / bar->priv->layout.delta;
+}
+
+static void
+update_peak_value (GvcLevelBar *bar)
+{
+        gdouble        value;
+        LevelBarLayout layout;
+
+        value = fraction_from_adjustment (bar, bar->priv->peak_adjustment);
+
+        bar->priv->peak_fraction = value;
+
+        if (value > bar->priv->max_peak) {
+                if (bar->priv->max_peak_id > 0)
+                        g_source_remove (bar->priv->max_peak_id);
+
+                bar->priv->max_peak_id =
+                        g_timeout_add_seconds (1, (GSourceFunc) reset_max_peak, bar);
+                bar->priv->max_peak = value;
+        }
+
+        layout = bar->priv->layout;
+
+        bar_calc_layout (bar);
+
+        if (layout_changed (&bar->priv->layout, &layout))
+                gtk_widget_queue_draw (GTK_WIDGET (bar));
+}
+
+static void
+update_rms_value (GvcLevelBar *bar)
+{
+        bar->priv->rms_fraction = fraction_from_adjustment (bar, bar->priv->rms_adjustment);
+}
+
+GtkOrientation
+gvc_level_bar_get_orientation (GvcLevelBar *bar)
+{
+        g_return_val_if_fail (GVC_IS_LEVEL_BAR (bar), 0);
+
+        return bar->priv->orientation;
+}
+
+void
+gvc_level_bar_set_orientation (GvcLevelBar   *bar,
+                               GtkOrientation orientation)
+{
+        g_return_if_fail (GVC_IS_LEVEL_BAR (bar));
+
+        if (orientation != bar->priv->orientation) {
+                if (G_UNLIKELY (orientation != GTK_ORIENTATION_VERTICAL &&
+                                orientation != GTK_ORIENTATION_HORIZONTAL)) {
+                        g_warn_if_reached ();
+                        return;
+                }
+
+                bar->priv->orientation = orientation;
+
+                gtk_widget_queue_draw (GTK_WIDGET (bar));
+
+                g_object_notify_by_pspec (G_OBJECT (bar), properties[PROP_ORIENTATION]);
+        }
+}
+
+static void
+on_peak_adjustment_value_changed (GtkAdjustment *adjustment,
+                                  GvcLevelBar   *bar)
+{
+        update_peak_value (bar);
+}
+
+static void
+on_rms_adjustment_value_changed (GtkAdjustment *adjustment,
+                                 GvcLevelBar   *bar)
+{
+        update_rms_value (bar);
+}
+
+void
+gvc_level_bar_set_peak_adjustment (GvcLevelBar   *bar,
+                                   GtkAdjustment *adjustment)
+{
+        g_return_if_fail (GVC_LEVEL_BAR (bar));
+        g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
+
+        if (bar->priv->peak_adjustment != NULL) {
+                g_signal_handlers_disconnect_by_func (G_OBJECT (bar->priv->peak_adjustment),
+                                                      G_CALLBACK (on_peak_adjustment_value_changed),
+                                                      bar);
+                g_object_unref (bar->priv->peak_adjustment);
+        }
+
+        bar->priv->peak_adjustment = g_object_ref_sink (adjustment);
+
+        g_signal_connect (G_OBJECT (bar->priv->peak_adjustment),
+                          "value-changed",
+                          G_CALLBACK (on_peak_adjustment_value_changed),
+                          bar);
+
+        update_peak_value (bar);
+
+        g_object_notify_by_pspec (G_OBJECT (bar), properties[PROP_PEAK_ADJUSTMENT]);
+}
+
+void
+gvc_level_bar_set_rms_adjustment (GvcLevelBar   *bar,
+                                  GtkAdjustment *adjustment)
+{
+        g_return_if_fail (GVC_LEVEL_BAR (bar));
+        g_return_if_fail (GTK_IS_ADJUSTMENT (adjustment));
+
+        if (bar->priv->rms_adjustment != NULL) {
+                g_signal_handlers_disconnect_by_func (G_OBJECT (bar->priv->rms_adjustment),
+                                                      G_CALLBACK (on_rms_adjustment_value_changed),
+                                                      bar);
+                g_object_unref (bar->priv->rms_adjustment);
+        }
+
+        bar->priv->rms_adjustment = g_object_ref_sink (adjustment);
+
+        g_signal_connect (G_OBJECT (bar->priv->rms_adjustment),
+                          "value-changed",
+                          G_CALLBACK (on_rms_adjustment_value_changed),
+                          bar);
+
+        update_rms_value (bar);
+
+        g_object_notify_by_pspec (G_OBJECT (bar), properties[PROP_RMS_ADJUSTMENT]);
+}
+
+GtkAdjustment *
+gvc_level_bar_get_peak_adjustment (GvcLevelBar *bar)
+{
+        g_return_val_if_fail (GVC_IS_LEVEL_BAR (bar), NULL);
+
+        return bar->priv->peak_adjustment;
+}
+
+GtkAdjustment *
+gvc_level_bar_get_rms_adjustment (GvcLevelBar *bar)
+{
+        g_return_val_if_fail (GVC_IS_LEVEL_BAR (bar), NULL);
+
+        return bar->priv->rms_adjustment;
+}
+
+void
+gvc_level_bar_set_scale (GvcLevelBar *bar, GvcLevelScale scale)
+{
+        g_return_if_fail (GVC_IS_LEVEL_BAR (bar));
+
+        if (scale != bar->priv->scale) {
+                if (G_UNLIKELY (scale != GVC_LEVEL_SCALE_LINEAR &&
+                                scale != GVC_LEVEL_SCALE_LOG)) {
+                        g_warn_if_reached ();
+                        return;
+                }
+                bar->priv->scale = scale;
+
+                update_peak_value (bar);
+                update_rms_value (bar);
+
+                g_object_notify_by_pspec (G_OBJECT (bar), properties[PROP_SCALE]);
+        }
+}
+
+static void
+gvc_level_bar_set_property (GObject       *object,
+                            guint          prop_id,
+                            const GValue  *value,
+                            GParamSpec    *pspec)
+{
+        GvcLevelBar *self = GVC_LEVEL_BAR (object);
+
+        switch (prop_id) {
+        case PROP_SCALE:
+                gvc_level_bar_set_scale (self, g_value_get_int (value));
+                break;
+        case PROP_ORIENTATION:
+                gvc_level_bar_set_orientation (self, g_value_get_enum (value));
+                break;
+        case PROP_PEAK_ADJUSTMENT:
+                gvc_level_bar_set_peak_adjustment (self, g_value_get_object (value));
+                break;
+        case PROP_RMS_ADJUSTMENT:
+                gvc_level_bar_set_rms_adjustment (self, g_value_get_object (value));
+                break;
+        default:
+                G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+                break;
+        }
+}
+
+static void
+gvc_level_bar_get_property (GObject     *object,
+                            guint        prop_id,
+                            GValue      *value,
+                            GParamSpec  *pspec)
+{
+        GvcLevelBar *self = GVC_LEVEL_BAR (object);
+
+        switch (prop_id) {
+        case PROP_SCALE:
+                g_value_set_int (value, self->priv->scale);
+                break;
+        case PROP_ORIENTATION:
+                g_value_set_enum (value, self->priv->orientation);
+                break;
+        case PROP_PEAK_ADJUSTMENT:
+                g_value_set_object (value, self->priv->peak_adjustment);
+                break;
+        case PROP_RMS_ADJUSTMENT:
+                g_value_set_object (value, self->priv->rms_adjustment);
+                break;
+        default:
+                G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+                break;
+        }
+}
+
+static void
+gvc_level_bar_size_request (GtkWidget      *widget,
+                            GtkRequisition *requisition)
+{
+        GvcLevelBar *bar;
+
+        g_return_if_fail (GVC_IS_LEVEL_BAR (widget));
+        g_return_if_fail (requisition != NULL);
+
+        bar = GVC_LEVEL_BAR (widget);
+
+        switch (bar->priv->orientation) {
+        case GTK_ORIENTATION_VERTICAL:
+                requisition->width  = VERTICAL_BAR_WIDTH;
+                requisition->height = MIN_VERTICAL_BAR_HEIGHT;
+                break;
+        case GTK_ORIENTATION_HORIZONTAL:
+                requisition->width  = MIN_HORIZONTAL_BAR_WIDTH;
+                requisition->height = HORIZONTAL_BAR_HEIGHT;
+                break;
+        }
+}
+
+#if GTK_CHECK_VERSION (3, 0, 0)
+static void
+gvc_level_bar_get_preferred_width (GtkWidget *widget,
+                                   gint      *minimum,
+                                   gint      *natural)
+{
+        GtkRequisition requisition;
+
+        gvc_level_bar_size_request (widget, &requisition);
+
+        if (minimum != NULL)
+                *minimum = requisition.width;
+        if (natural != NULL)
+                *natural = requisition.width;
+}
+
+static void
+gvc_level_bar_get_preferred_height (GtkWidget *widget,
+                                    gint      *minimum,
+                                    gint      *natural)
+{
+        GtkRequisition requisition;
+
+        gvc_level_bar_size_request (widget, &requisition);
+
+        if (minimum != NULL)
+                *minimum = requisition.height;
+        if (natural != NULL)
+                *natural = requisition.height;
+}
+#endif
+
+static void
+gvc_level_bar_size_allocate (GtkWidget *widget, GtkAllocation *allocation)
+{
+        GvcLevelBar *bar;
+
+        bar = GVC_LEVEL_BAR (widget);
+
+        /* FIXME: add height property, labels, etc */
+        GTK_WIDGET_CLASS (gvc_level_bar_parent_class)->size_allocate (widget, allocation);
+
+        gtk_widget_set_allocation (widget, allocation);
+        gtk_widget_get_allocation (widget, allocation);
+
+        if (bar->priv->orientation == GTK_ORIENTATION_VERTICAL) {
+                allocation->height = MIN (allocation->height, MIN_VERTICAL_BAR_HEIGHT);
+                allocation->width  = MAX (allocation->width, VERTICAL_BAR_WIDTH);
+        } else {
+                allocation->width  = MIN (allocation->width, MIN_HORIZONTAL_BAR_WIDTH);
+                allocation->height = MAX (allocation->height, HORIZONTAL_BAR_HEIGHT);
+        }
+
+        bar_calc_layout (bar);
+}
+
+static void
+curved_rectangle (cairo_t *cr,
+                  double   x0,
+                  double   y0,
+                  double   width,
+                  double   height,
+                  double   radius)
+{
+        double x1;
+        double y1;
+
+        x1 = x0 + width;
+        y1 = y0 + height;
+
+        if (!width || !height)
+                return;
+
+        if (width / 2 < radius) {
+                if (height / 2 < radius) {
+                        cairo_move_to  (cr, x0, (y0 + y1) / 2);
+                        cairo_curve_to (cr, x0 ,y0, x0, y0, (x0 + x1) / 2, y0);
+                        cairo_curve_to (cr, x1, y0, x1, y0, x1, (y0 + y1) / 2);
+                        cairo_curve_to (cr, x1, y1, x1, y1, (x1 + x0) / 2, y1);
+                        cairo_curve_to (cr, x0, y1, x0, y1, x0, (y0 + y1) / 2);
+                } else {
+                        cairo_move_to  (cr, x0, y0 + radius);
+                        cairo_curve_to (cr, x0, y0, x0, y0, (x0 + x1) / 2, y0);
+                        cairo_curve_to (cr, x1, y0, x1, y0, x1, y0 + radius);
+                        cairo_line_to  (cr, x1, y1 - radius);
+                        cairo_curve_to (cr, x1, y1, x1, y1, (x1 + x0) / 2, y1);
+                        cairo_curve_to (cr, x0, y1, x0, y1, x0, y1 - radius);
+                }
+        } else {
+                if (height / 2 < radius) {
+                        cairo_move_to  (cr, x0, (y0 + y1) / 2);
+                        cairo_curve_to (cr, x0, y0, x0 , y0, x0 + radius, y0);
+                        cairo_line_to  (cr, x1 - radius, y0);
+                        cairo_curve_to (cr, x1, y0, x1, y0, x1, (y0 + y1) / 2);
+                        cairo_curve_to (cr, x1, y1, x1, y1, x1 - radius, y1);
+                        cairo_line_to  (cr, x0 + radius, y1);
+                        cairo_curve_to (cr, x0, y1, x0, y1, x0, (y0 + y1) / 2);
+                } else {
+                        cairo_move_to  (cr, x0, y0 + radius);
+                        cairo_curve_to (cr, x0 , y0, x0 , y0, x0 + radius, y0);
+                        cairo_line_to  (cr, x1 - radius, y0);
+                        cairo_curve_to (cr, x1, y0, x1, y0, x1, y0 + radius);
+                        cairo_line_to  (cr, x1, y1 - radius);
+                        cairo_curve_to (cr, x1, y1, x1, y1, x1 - radius, y1);
+                        cairo_line_to  (cr, x0 + radius, y1);
+                        cairo_curve_to (cr, x0, y1, x0, y1, x0, y1 - radius);
+                }
+        }
+
+        cairo_close_path (cr);
+}
+
+static int
+gvc_level_bar_draw (GtkWidget *widget, cairo_t *cr)
+{
+        GvcLevelBar *bar;
+
+        bar = GVC_LEVEL_BAR (widget);
+
+        cairo_save (cr);
+
+        if (bar->priv->orientation == GTK_ORIENTATION_VERTICAL) {
+                int i;
+                int by;
+
+                for (i = 0; i < NUM_BOXES; i++) {
+                        by = i * bar->priv->layout.delta;
+                        curved_rectangle (cr,
+                                          bar->priv->layout.area.x + 0.5,
+                                          by + 0.5,
+                                          bar->priv->layout.box_width - 1,
+                                          bar->priv->layout.box_height - 1,
+                                          bar->priv->layout.box_radius);
+                        if ((bar->priv->layout.max_peak_num - 1) == i) {
+                                /* fill peak foreground */
+#if GTK_CHECK_VERSION (3, 0, 0)
+                                gdk_cairo_set_source_rgba (cr, &bar->priv->layout.color_fg);
+#else
+                                gdk_cairo_set_source_color (cr, &bar->priv->layout.color_fg);
+#endif
+                                cairo_fill_preserve (cr);
+                        } else if ((bar->priv->layout.peak_num - 1) >= i) {
+                                /* fill background */
+#if GTK_CHECK_VERSION (3, 0, 0)
+                                gdk_cairo_set_source_rgba (cr, &bar->priv->layout.color_bg);
+#else
+                                gdk_cairo_set_source_color (cr, &bar->priv->layout.color_bg);
+#endif
+                                cairo_fill_preserve (cr);
+
+                                /* fill foreground */
+#if GTK_CHECK_VERSION (3, 0, 0)
+                                cairo_set_source_rgba (cr,
+                                                       bar->priv->layout.color_fg.red,
+                                                       bar->priv->layout.color_fg.green,
+                                                       bar->priv->layout.color_fg.blue,
+                                                       0.5);
+#else
+                                cairo_set_source_rgba (cr,
+                                                       bar->priv->layout.color_fg.red / 65535.0,
+                                                       bar->priv->layout.color_fg.green / 65535.0,
+                                                       bar->priv->layout.color_fg.blue / 65535.0,
+                                                       0.5);
+#endif
+                                cairo_fill_preserve (cr);
+                        } else {
+                                /* fill background */
+#if GTK_CHECK_VERSION (3, 0, 0)
+                                gdk_cairo_set_source_rgba (cr, &bar->priv->layout.color_bg);
+#else
+                                gdk_cairo_set_source_color (cr, &bar->priv->layout.color_bg);
+#endif
+                                cairo_fill_preserve (cr);
+                        }
+
+                        /* stroke border */
+#if GTK_CHECK_VERSION (3, 0, 0)
+                        gdk_cairo_set_source_rgba (cr, &bar->priv->layout.color_dark);
+#else
+                        gdk_cairo_set_source_color (cr, &bar->priv->layout.color_dark);
+#endif
+                        cairo_set_line_width (cr, 1);
+                        cairo_stroke (cr);
+                }
+        } else {
+                int i;
+                int bx;
+
+                if (gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL) {
+                        GtkAllocation allocation;
+
+                        gtk_widget_get_allocation (widget, &allocation);
+
+                        cairo_scale (cr, -1, 1);
+                        cairo_translate (cr, -allocation.width, 0);
+                }
+
+                for (i = 0; i < NUM_BOXES; i++) {
+                        bx = i * bar->priv->layout.delta;
+                        curved_rectangle (cr,
+                                          bx + 0.5,
+                                          bar->priv->layout.area.y + 0.5,
+                                          bar->priv->layout.box_width - 1,
+                                          bar->priv->layout.box_height - 1,
+                                          bar->priv->layout.box_radius);
+
+                        if ((bar->priv->layout.max_peak_num - 1) == i) {
+                                /* fill peak foreground */
+#if GTK_CHECK_VERSION (3, 0, 0)
+                                gdk_cairo_set_source_rgba (cr, &bar->priv->layout.color_fg);
+#else
+                                gdk_cairo_set_source_color (cr, &bar->priv->layout.color_fg);
+#endif
+                                cairo_fill_preserve (cr);
+                        } else if ((bar->priv->layout.peak_num - 1) >= i) {
+                                /* fill background */
+#if GTK_CHECK_VERSION (3, 0, 0)
+                                gdk_cairo_set_source_rgba (cr, &bar->priv->layout.color_bg);
+#else
+                                gdk_cairo_set_source_color (cr, &bar->priv->layout.color_bg);
+#endif
+                                cairo_fill_preserve (cr);
+
+                                /* fill foreground */
+#if GTK_CHECK_VERSION (3, 0, 0)
+                                cairo_set_source_rgba (cr,
+                                                       bar->priv->layout.color_fg.red,
+                                                       bar->priv->layout.color_fg.green,
+                                                       bar->priv->layout.color_fg.blue,
+                                                       0.5);
+#else
+                                cairo_set_source_rgba (cr,
+                                                       bar->priv->layout.color_fg.red / 65535.0,
+                                                       bar->priv->layout.color_fg.green / 65535.0,
+                                                       bar->priv->layout.color_fg.blue / 65535.0,
+                                                       0.5);
+#endif
+                                cairo_fill_preserve (cr);
+                        } else {
+                                /* fill background */
+#if GTK_CHECK_VERSION (3, 0, 0)
+                                gdk_cairo_set_source_rgba (cr, &bar->priv->layout.color_bg);
+#else
+                                gdk_cairo_set_source_color (cr, &bar->priv->layout.color_bg);
+#endif
+                                cairo_fill_preserve (cr);
+                        }
+
+                        /* stroke border */
+#if GTK_CHECK_VERSION (3, 0, 0)
+                        gdk_cairo_set_source_rgba (cr, &bar->priv->layout.color_dark);
+#else
+                        gdk_cairo_set_source_color (cr, &bar->priv->layout.color_dark);
+#endif
+                        cairo_set_line_width (cr, 1);
+                        cairo_stroke (cr);
+                }
+        }
+
+        cairo_restore (cr);
+
+        return FALSE;
+}
+
+#if !GTK_CHECK_VERSION (3, 0, 0)
+static int
+gvc_level_bar_expose (GtkWidget *widget, GdkEventExpose *event)
+{
+        cairo_t       *cr;
+        GtkAllocation  allocation;
+
+        g_return_val_if_fail (event != NULL, FALSE);
+
+        /* Event queue compression */
+        if (event->count > 0)
+                return FALSE;
+
+        gtk_widget_get_allocation (widget, &allocation);
+
+        cr = gdk_cairo_create (gtk_widget_get_window (widget));
+        cairo_translate (cr,
+                         allocation.x,
+                         allocation.y);
+
+        gvc_level_bar_draw (widget, cr);
+
+        cairo_destroy (cr);
+        return FALSE;
+}
+#endif
+
+static void
+gvc_level_bar_class_init (GvcLevelBarClass *klass)
+{
+        GObjectClass   *object_class = G_OBJECT_CLASS (klass);
+        GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
+
+        object_class->finalize = gvc_level_bar_finalize;
+        object_class->set_property = gvc_level_bar_set_property;
+        object_class->get_property = gvc_level_bar_get_property;
+
+#if GTK_CHECK_VERSION (3, 0, 0)
+        widget_class->draw = gvc_level_bar_draw;
+        widget_class->get_preferred_width = gvc_level_bar_get_preferred_width;
+        widget_class->get_preferred_height = gvc_level_bar_get_preferred_height;
+#else
+        widget_class->expose_event = gvc_level_bar_expose;
+        widget_class->size_request = gvc_level_bar_size_request;
+#endif
+        widget_class->size_allocate = gvc_level_bar_size_allocate;
+
+        properties[PROP_ORIENTATION] =
+                g_param_spec_enum ("orientation",
+                                   "Orientation",
+                                   "The orientation of the bar",
+                                   GTK_TYPE_ORIENTATION,
+                                   GTK_ORIENTATION_HORIZONTAL,
+                                   G_PARAM_READWRITE |
+                                   G_PARAM_STATIC_STRINGS);
+
+        properties[PROP_PEAK_ADJUSTMENT] =
+                g_param_spec_object ("peak-adjustment",
+                                     "Peak Adjustment",
+                                     "The GtkAdjustment that contains the current peak value",
+                                     GTK_TYPE_ADJUSTMENT,
+                                     G_PARAM_READWRITE |
+                                     G_PARAM_STATIC_STRINGS);
+
+        properties[PROP_RMS_ADJUSTMENT] =
+                g_param_spec_object ("rms-adjustment",
+                                     "RMS Adjustment",
+                                     "The GtkAdjustment that contains the current rms value",
+                                     GTK_TYPE_ADJUSTMENT,
+                                     G_PARAM_READWRITE |
+                                     G_PARAM_STATIC_STRINGS);
+
+        properties[PROP_SCALE] =
+                g_param_spec_int ("scale",
+                                  "Scale",
+                                  "Scale",
+                                  0,
+                                  G_MAXINT,
+                                  GVC_LEVEL_SCALE_LINEAR,
+                                  G_PARAM_READWRITE |
+                                  G_PARAM_CONSTRUCT |
+                                  G_PARAM_STATIC_STRINGS);
+
+        g_object_class_install_properties (object_class, N_PROPERTIES, properties);
+
+        g_type_class_add_private (klass, sizeof (GvcLevelBarPrivate));
+}
+
+static void
+gvc_level_bar_init (GvcLevelBar *bar)
+{
+#if GTK_CHECK_VERSION (3, 0, 0)
+        GtkStyleContext *context = gtk_widget_get_style_context (GTK_WIDGET (bar));
+
+        gtk_style_context_add_class (context, GTK_STYLE_CLASS_LIST_ROW);
+#endif
+
+        bar->priv = GVC_LEVEL_BAR_GET_PRIVATE (bar);
+
+        bar->priv->peak_adjustment = GTK_ADJUSTMENT (gtk_adjustment_new (0.0,
+                                                                         0.0,
+                                                                         1.0,
+                                                                         0.05,
+                                                                         0.1,
+                                                                         0.1));
+        g_object_ref_sink (bar->priv->peak_adjustment);
+
+        g_signal_connect (bar->priv->peak_adjustment,
+                          "value-changed",
+                          G_CALLBACK (on_peak_adjustment_value_changed),
+                          bar);
+
+        bar->priv->rms_adjustment = GTK_ADJUSTMENT (gtk_adjustment_new (0.0,
+                                                                        0.0,
+                                                                        1.0,
+                                                                        0.05,
+                                                                        0.1,
+                                                                        0.1));
+        g_object_ref_sink (bar->priv->rms_adjustment);
+
+        g_signal_connect (bar->priv->rms_adjustment,
+                          "value-changed",
+                          G_CALLBACK (on_rms_adjustment_value_changed),
+                          bar);
+
+        gtk_widget_set_has_window (GTK_WIDGET (bar), FALSE);
+}
+
+static void
+gvc_level_bar_finalize (GObject *object)
+{
+        GvcLevelBar *bar;
+
+        bar = GVC_LEVEL_BAR (object);
+
+        if (bar->priv->max_peak_id > 0)
+                g_source_remove (bar->priv->max_peak_id);
+
+        G_OBJECT_CLASS (gvc_level_bar_parent_class)->finalize (object);
+}
+
+GtkWidget *
+gvc_level_bar_new (void)
+{
+        return g_object_new (GVC_TYPE_LEVEL_BAR, NULL);
+}