+using System.Collections;
+using System.IO;
+using System;
+using Cairo;
+using Pango;
+
+public struct HelpItem {
+ public string Key;
+ public string Text;
+
+ public HelpItem(string key, string text) {
+ Key = key;
+ Text = text;
+ }
+
+ public override string ToString() {
+ return "<b>" + Key + "</b>\t" + Text;
+ }
+}
+
+public class HelpBox {
+ private Pango.Context pc;
+ private Pango.FontDescription titleFont;
+ private Pango.FontDescription textFont;
+ private string helpTitle;
+ private HelpItem[] helpText;
+ private int Width = 480;
+ private int Height = 360;
+ private int Columns = 3;
+
+ public HelpBox(Pango.Context pc, string title, HelpItem[] items) {
+ this.pc = pc;
+ helpTitle = title;
+ helpText = items;
+ init();
+ }
+
+ public HelpBox(Pango.Context pc, string filename) {
+ StreamReader file = new StreamReader(filename);
+ string line;
+ ArrayList items = new ArrayList();
+
+ this.pc = pc;
+ helpTitle = file.ReadLine();
+ while ((line = file.ReadLine()) != null) {
+ string[] i = line.Split(null);
+ if (i.Length == 2) {
+ items.Add(new HelpItem(i[0], i[1]));
+ }
+ }
+ helpText = new HelpItem[items.Count];
+ for (int i = 0; i < items.Count; i++) {
+ helpText[i] = (HelpItem) items[i];
+ }
+ init();
+ }
+
+ private void init() {
+ titleFont = Pango.FontDescription.FromString("Helvetica Bold 24");
+ textFont = Pango.FontDescription.FromString("Helvetica 16");
+ Pango.FontMetrics fmTitle = pc.GetMetrics(titleFont, null);
+ Pango.FontMetrics fmText = pc.GetMetrics(textFont, null);
+ int hTitle = Pango.Units.ToPixels(fmTitle.Ascent + fmTitle.Descent);
+ int hText = Pango.Units.ToPixels(fmText.Ascent + fmText.Descent);
+
+ Width = 480;
+ for (int i = 0; i < helpText.Length; i++) {
+ Pango.Layout layout = new Pango.Layout(pc);
+ Pango.Rectangle r, r2;
+
+ layout.FontDescription = textFont;
+ layout.SetMarkup(helpText[i].ToString());
+ layout.GetExtents(out r, out r2);
+ int pw = Pango.Units.ToPixels(r2.Width);
+ if ((pw + 8) * Columns > Width) {
+ Width = (pw + 8) * Columns;
+ }
+ }
+ Height = hTitle + (helpText.Length / 3 + 1) * hText + 12;
+ }
+
+ public void draw(Cairo.Context gr, int width, int height) {
+ Pango.Layout layout;
+ Cairo.Rectangle r = new Cairo.Rectangle(
+ width / 2 - Width / 2,
+ height / 2 - Height / 2,
+ Width, Height);
+
+ gr.SetSourceRGBA(1.0, 1.0, 1.0, 0.8);
+ gr.NewPath();
+ gr.Rectangle(r);
+ gr.Fill();
+
+ gr.SetSourceRGB(0.0, 0.0, 0.0);
+ gr.NewPath();
+ gr.Rectangle(r);
+ gr.Stroke();
+
+ gr.MoveTo(r.X + 4, r.Y + 4);
+ layout = new Pango.Layout(pc);
+ layout.SetText(helpTitle);
+ layout.Width = Pango.Units.FromPixels((int)r.Width);
+ layout.FontDescription = titleFont;
+ Pango.CairoHelper.ShowLayout(gr, layout);
+
+ int ii = 0;
+ int ColumnWidth = Width / Columns;
+ int ColumnLines = helpText.Length / Columns + 1;
+ for (int i = 0; i < Columns; i++) {
+ gr.MoveTo(r.X + 4 + (i * ColumnWidth), r.Y + 38);
+ string column = "";
+ for (int j = 0; j < ColumnLines && ii < helpText.Length; j++) {
+ column += helpText[ii].ToString() + "\n";
+ ii++;
+ }
+ layout = new Pango.Layout(pc);
+ layout.SetMarkup(column);
+ layout.Width = Pango.Units.FromPixels(ColumnWidth);
+ layout.FontDescription = textFont;
+ Pango.CairoHelper.ShowLayout(gr, layout);
+ }
+ }
+}