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// Aaron Bockover <abockover@novell.com>
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// Copyright (C) 2008 Novell, Inc.
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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using System.Collections.Generic;
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namespace Hyena.Widgets
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public class SegmentedBar : Widget
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public delegate string BarValueFormatHandler (Segment segment);
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private double percent;
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private Cairo.Color color;
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private bool show_in_bar;
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public Segment (string title, double percent, Cairo.Color color)
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: this (title, percent, color, true)
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public Segment (string title, double percent, Cairo.Color color, bool showInBar)
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this.percent = percent;
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this.show_in_bar = showInBar;
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set { title = value; }
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public double Percent {
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get { return percent; }
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set { percent = value; }
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public Cairo.Color Color {
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set { color = value; }
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public bool ShowInBar {
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get { return show_in_bar; }
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set { show_in_bar = value; }
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internal int LayoutWidth;
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internal int LayoutHeight;
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private List<Segment> segments = new List<Segment> ();
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private int layout_width;
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private int layout_height;
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private int bar_height = 26;
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private int bar_label_spacing = 8;
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private int segment_label_spacing = 16;
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private int segment_box_size = 12;
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private int segment_box_spacing = 6;
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private int h_padding = 0;
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private bool show_labels = true;
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private bool reflect = true;
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private Color remainder_color = CairoExtensions.RgbToColor (0xeeeeee);
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private BarValueFormatHandler format_handler;
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public SegmentedBar ()
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WidgetFlags |= WidgetFlags.NoWindow;
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protected override void OnRealized ()
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GdkWindow = Parent.GdkWindow;
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#region Size Calculations
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protected override void OnSizeRequested (ref Requisition requisition)
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requisition.Width = 200;
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requisition.Height = 0;
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protected override void OnSizeAllocated (Gdk.Rectangle allocation)
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int _bar_height = reflect ? (int)Math.Ceiling (bar_height * 1.75) : bar_height;
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ComputeLayoutSize ();
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HeightRequest = Math.Max (bar_height + bar_label_spacing + layout_height, _bar_height);
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WidthRequest = layout_width + (2 * h_padding);
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HeightRequest = _bar_height;
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WidthRequest = bar_height + (2 * h_padding);
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base.OnSizeAllocated (allocation);
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private void ComputeLayoutSize ()
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if (segments.Count == 0) {
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Pango.Layout layout = null;
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layout_width = layout_height = 0;
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for (int i = 0, n = segments.Count; i < n; i++) {
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layout = CreateAdaptLayout (layout, false, true);
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layout.SetText (FormatSegmentText (segments[i]));
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layout.GetPixelSize (out aw, out ah);
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layout = CreateAdaptLayout (layout, true, false);
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layout.SetText (FormatSegmentValue (segments[i]));
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layout.GetPixelSize (out bw, out bh);
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int w = Math.Max (aw, bw);
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segments[i].LayoutWidth = w;
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segments[i].LayoutHeight = Math.Max (h, segment_box_size * 2);
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layout_width += segments[i].LayoutWidth + segment_box_size + segment_box_spacing
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+ (i < n - 1 ? segment_label_spacing : 0);
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layout_height = Math.Max (layout_height, segments[i].LayoutHeight);
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#region Public Methods
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public void AddSegmentRgba (string title, double percent, uint rgbaColor)
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AddSegment (title, percent, CairoExtensions.RgbaToColor (rgbaColor));
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public void AddSegmentRgb (string title, double percent, uint rgbColor)
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AddSegment (title, percent, CairoExtensions.RgbToColor (rgbColor));
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public void AddSegment (string title, double percent, Color color)
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AddSegment (new Segment (title, percent, color, true));
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public void AddSegment (string title, double percent, Color color, bool showInBar)
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AddSegment (new Segment (title, percent, color, showInBar));
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public void AddSegment (Segment segment)
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segments.Add (segment);
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public void UpdateSegment (int index, double percent)
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segments[index].Percent = percent;
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#region Public Properties
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public BarValueFormatHandler ValueFormatter {
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get { return format_handler; }
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set { format_handler = value; }
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public Color RemainderColor {
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get { return remainder_color; }
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remainder_color = value;
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public int BarHeight {
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get { return bar_height; }
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if (bar_height != value) {
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public bool ShowReflection {
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get { return reflect; }
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if (reflect != value) {
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public bool ShowLabels {
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get { return show_labels; }
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if (show_labels != value) {
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public int SegmentLabelSpacing {
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get { return segment_label_spacing; }
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if (segment_label_spacing != value) {
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segment_label_spacing = value;
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public int SegmentBoxSize {
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get { return segment_box_size; }
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if (segment_box_size != value) {
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segment_box_size = value;
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public int SegmentBoxSpacing {
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get { return segment_box_spacing; }
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if (segment_box_spacing != value) {
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segment_box_spacing = value;
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public int BarLabelSpacing {
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get { return bar_label_spacing; }
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if (bar_label_spacing != value) {
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bar_label_spacing = value;
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public int HorizontalPadding {
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get { return h_padding; }
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if (h_padding != value) {
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protected override bool OnExposeEvent (Gdk.EventExpose evnt)
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if (evnt.Window != GdkWindow) {
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return base.OnExposeEvent (evnt);
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Cairo.Context cr = Gdk.CairoHelper.Create (evnt.Window);
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CairoExtensions.PushGroup (cr);
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cr.Operator = Operator.Over;
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cr.Translate (Allocation.X + h_padding, Allocation.Y);
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cr.Rectangle (0, 0, Allocation.Width - h_padding, Math.Max (2 * bar_height,
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bar_height + bar_label_spacing + layout_height));
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Pattern bar = RenderBar (Allocation.Width - 2 * h_padding, bar_height);
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cr.Rectangle (0, bar_height, Allocation.Width - h_padding, bar_height);
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Matrix matrix = new Matrix ();
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matrix.InitScale (1, -1);
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matrix.Translate (0, -(2 * bar_height) + 1);
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cr.Transform (matrix);
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LinearGradient mask = new LinearGradient (0, 0, 0, bar_height);
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mask.AddColorStop (0.25, new Color (0, 0, 0, 0));
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mask.AddColorStop (0.5, new Color (0, 0, 0, 0.125));
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mask.AddColorStop (0.75, new Color (0, 0, 0, 0.4));
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mask.AddColorStop (1.0, new Color (0, 0, 0, 0.7));
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CairoExtensions.PopGroupToSource (cr);
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cr.Translate ((reflect ? Allocation.X : -h_padding) + (Allocation.Width - layout_width) / 2,
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(reflect ? Allocation.Y : 0) + bar_height + bar_label_spacing);
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CairoExtensions.DisposeContext (cr);
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private Pattern RenderBar (int w, int h)
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ImageSurface s = new ImageSurface (Format.Argb32, w, h);
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Context cr = new Context (s);
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RenderBar (cr, w, h, h / 2);
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// TODO Implement the new ctor - see http://bugzilla.gnome.org/show_bug.cgi?id=561394
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#pragma warning disable 0618
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Pattern pattern = new Pattern (s);
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#pragma warning restore 0618
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((IDisposable)cr).Dispose ();
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private void RenderBar (Context cr, int w, int h, int r)
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RenderBarSegments (cr, w, h, r);
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RenderBarStrokes (cr, w, h, r);
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private void RenderBarSegments (Context cr, int w, int h, int r)
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LinearGradient grad = new LinearGradient (0, 0, w, 0);
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foreach (Segment segment in segments) {
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if (segment.Percent > 0) {
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grad.AddColorStop (last, segment.Color);
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grad.AddColorStop (last += segment.Percent, segment.Color);
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CairoExtensions.RoundedRectangle (cr, 0, 0, w, h, r);
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cr.Pattern.Destroy ();
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grad = new LinearGradient (0, 0, 0, h);
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grad.AddColorStop (0.0, new Color (1, 1, 1, 0.125));
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grad.AddColorStop (0.35, new Color (1, 1, 1, 0.255));
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grad.AddColorStop (1, new Color (0, 0, 0, 0.4));
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cr.Pattern.Destroy ();
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private void RenderBarStrokes (Context cr, int w, int h, int r)
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LinearGradient stroke = MakeSegmentGradient (h, CairoExtensions.RgbaToColor (0x00000040));
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LinearGradient seg_sep_light = MakeSegmentGradient (h, CairoExtensions.RgbaToColor (0xffffff20));
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LinearGradient seg_sep_dark = MakeSegmentGradient (h, CairoExtensions.RgbaToColor (0x00000020));
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double x = seg_w > r ? seg_w : r;
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cr.MoveTo (x - 0.5, 1);
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cr.LineTo (x - 0.5, h - 1);
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cr.Pattern = seg_sep_light;
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cr.MoveTo (x + 0.5, 1);
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cr.LineTo (x + 0.5, h - 1);
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cr.Pattern = seg_sep_dark;
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CairoExtensions.RoundedRectangle (cr, 0.5, 0.5, w - 1, h - 1, r);
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seg_sep_light.Destroy ();
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seg_sep_dark.Destroy ();
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private LinearGradient MakeSegmentGradient (int h, Color color)
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return MakeSegmentGradient (h, color, false);
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private LinearGradient MakeSegmentGradient (int h, Color color, bool diag)
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LinearGradient grad = new LinearGradient (0, 0, 0, h);
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grad.AddColorStop (0, CairoExtensions.ColorShade (color, 1.1));
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grad.AddColorStop (0.35, CairoExtensions.ColorShade (color, 1.2));
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grad.AddColorStop (1, CairoExtensions.ColorShade (color, 0.8));
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private void RenderLabels (Context cr)
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if (segments.Count == 0) {
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Pango.Layout layout = null;
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Color text_color = CairoExtensions.GdkColorToCairoColor (Style.Foreground (State));
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Color box_stroke_color = new Color (0, 0, 0, 0.6);
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foreach (Segment segment in segments) {
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cr.Rectangle (x + 0.5, 2 + 0.5, segment_box_size - 1, segment_box_size - 1);
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LinearGradient grad = MakeSegmentGradient (segment_box_size, segment.Color, true);
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cr.Color = box_stroke_color;
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x += segment_box_size + segment_box_spacing;
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layout = CreateAdaptLayout (layout, false, true);
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layout.SetText (FormatSegmentText (segment));
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layout.GetPixelSize (out lw, out lh);
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cr.Color = text_color;
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PangoCairoHelper.ShowLayout (cr, layout);
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layout = CreateAdaptLayout (layout, true, false);
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layout.SetText (FormatSegmentValue (segment));
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cr.Color = text_color;
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PangoCairoHelper.ShowLayout (cr, layout);
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x += segment.LayoutWidth + segment_label_spacing;
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private int pango_size_normal;
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private Pango.Layout CreateAdaptLayout (Pango.Layout layout, bool small, bool bold)
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if (layout == null) {
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Pango.Context context = CreatePangoContext ();
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layout = new Pango.Layout (context);
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layout.FontDescription = context.FontDescription;
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pango_size_normal = layout.FontDescription.Size;
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layout.FontDescription.Size = small
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? (int)(layout.FontDescription.Size * Pango.Scale.Small)
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layout.FontDescription.Weight = bold
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: Pango.Weight.Normal;
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private string FormatSegmentText (Segment segment)
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return segment.Title;
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private string FormatSegmentValue (Segment segment)
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return format_handler == null
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? String.Format ("{0}%", segment.Percent * 100.0)
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: format_handler (segment);
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[TestModule ("Segmented Bar")]
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internal class SegmentedBarTestModule : Window
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private SegmentedBar bar;
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public SegmentedBarTestModule () : base ("Segmented Bar")
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bar = new SegmentedBar ();
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bar.HorizontalPadding = bar.BarHeight / 2;
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bar.AddSegmentRgb ("Audio", 0.00187992456702332, 0x3465a4);
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bar.AddSegmentRgb ("Other", 0.0788718162651326, 0xf57900);
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bar.AddSegmentRgb ("Video", 0.0516869922033282, 0x73d216);
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bar.AddSegment ("Free Space", 0.867561266964516, bar.RemainderColor, false);
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bar.ValueFormatter = delegate (SegmentedBar.Segment segment) {
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return String.Format ("{0} GB", space * segment.Percent);
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HBox controls = new HBox ();
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controls.Spacing = 5;
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Label label = new Label ("Height:");
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controls.PackStart (label, false, false, 0);
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SpinButton height = new SpinButton (new Adjustment (bar.BarHeight, 5, 100, 1, 1, 1), 1, 0);
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height.Activated += delegate { bar.BarHeight = height.ValueAsInt; };
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height.Changed += delegate { bar.BarHeight = height.ValueAsInt; bar.HorizontalPadding = bar.BarHeight / 2; };
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controls.PackStart (height, false, false, 0);
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CheckButton reflect = new CheckButton ("Reflection");
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reflect.Active = bar.ShowReflection;
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reflect.Toggled += delegate { bar.ShowReflection = reflect.Active; };
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controls.PackStart (reflect, false, false, 0);
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CheckButton labels = new CheckButton ("Labels");
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labels.Active = bar.ShowLabels;
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labels.Toggled += delegate { bar.ShowLabels = labels.Active; };
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controls.PackStart (labels, false, false, 0);
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box.PackStart (controls, false, false, 0);
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box.PackStart (new HSeparator (), false, false, 0);
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box.PackStart (bar, false, false, 0);
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SetSizeRequest (350, -1);
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Gdk.Geometry limits = new Gdk.Geometry ();
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limits.MinWidth = SizeRequest ().Width;
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limits.MaxWidth = Gdk.Screen.Default.Width;
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limits.MinHeight = -1;
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limits.MaxHeight = -1;
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SetGeometryHints (this, limits, Gdk.WindowHints.MaxSize | Gdk.WindowHints.MinSize);
added
removed
lib/Hyena/src/Hyena.Gui/Hyena.Widgets/SegmentedBar.cs
