C# Drawing.TextLayout类代码示例

        protected override void OnDraw(Context ctx, Rectangle dirtyRect)
        {
            // Line arround
            ctx.SetColor(Colors.DarkGray);

            // Drive line arround
            ctx.Rectangle(Bounds);
            ctx.Fill();

            ctx.SetColor(Colors.Gray);
            ctx.Rectangle(Bounds.Inflate(-margin, -margin));
            ctx.Fill();

            // Draw image
            ctx.DrawImage(Image.FromResource(Logo), 5.0, 5.0);

            // Draw text
            ctx.SetColor(Colors.White);
            TextLayout _layout = new TextLayout();
            _layout.Font = Font.WithSize(22);
            _layout.Text = Label;
            _layout.SetFontWeight(FontWeight.Bold, 0, Label.Length);

            // Cocoa layouts
            ctx.DrawTextLayout(_layout, 45, ((Config.Cocoa || Config.Gtk) ? 5 : 2));
        }

		protected override LayoutWrapper RenderLine (long line)
		{
			var layout = new TextLayout (Editor);
			layout.Font = Editor.Options.Font;
			layout.Text = string.Format ("{0:X}", line * Editor.BytesInRow);
			return new LayoutWrapper (layout);
		}

		protected override LayoutWrapper RenderLine (long line)
		{
			var layout = new TextLayout (Editor);
			layout.Font = Editor.Options.Font;
			StringBuilder sb = new StringBuilder ();
			long startOffset = line * Editor.BytesInRow;
			long endOffset   = System.Math.Min (startOffset + Editor.BytesInRow, Data.Length);
			byte[] lineBytes = Data.GetBytes (startOffset, (int)(endOffset - startOffset));
			for (int i = 0; i < lineBytes.Length; i++) {
				byte b = lineBytes[i];
				char ch = (char)b;
				if (b < 128 && (Char.IsLetterOrDigit (ch) || Char.IsPunctuation (ch))) {
					sb.Append (ch);
				} else {
					sb.Append (".");
				}
			}
			
			layout.Text = sb.ToString ();
			Margin.LayoutWrapper result = new LayoutWrapper (layout);
			if (Data.IsSomethingSelected) {
				ISegment selection = Data.MainSelection.Segment;
				HandleSelection (selection.Offset, selection.EndOffset, startOffset, endOffset, null, delegate(long start, long end) {
					result.Layout.SetForeground (Style.Selection, (int)(start - startOffset), (int)(end - start));
					result.Layout.SetBackground (Style.SelectionBg, (int)(start - startOffset), (int)(end - start));
				});
			}
			return result;
		}

		internal protected override void OptionsChanged ()
		{
			var layout = new TextLayout (Editor);
			layout.Font = Editor.Options.Font;
			layout.Text = ".";
//			int height;
			charWidth = layout.GetSize ().Width;
			layout.Dispose ();
		}

		internal protected override void OptionsChanged ()
		{
			var layout = new TextLayout (Editor);
			layout.Font = Editor.Options.Font;
			layout.Text = string.Format ("0{0:X}", Data.Length) + "_";
//			int height;
			width = layout.GetSize ().Width;
			layout.Dispose ();
		}

        protected internal override void Draw(Context cr, Xwt.Rectangle area, DocumentLine line, int lineNumber, double x, double y, double height)
        {
            if (line != null)
            {
                TextLayout layout;
                if (!layoutDict.TryGetValue(line, out layout))
                {
                    var mode = editor.Document.SyntaxMode;
                    var style = SyntaxModeService.DefaultColorStyle;
                    var chunks = GetCachedChunks(mode, editor.Document, style, line, line.Offset, line.Length);

                    layout = new TextLayout();
                    layout.Font = editor.Options.EditorFont;
                    string lineText = editor.Document.GetLineText(lineNumber);
                    var stringBuilder = new StringBuilder(lineText.Length);

                    int currentVisualColumn = 1;
                    for (int i = 0; i < lineText.Length; ++i)
                    {
                        char chr = lineText[i];
                        if (chr == '\t')
                        {
                            int length = GetNextTabstop(editor, currentVisualColumn) - currentVisualColumn;
                            stringBuilder.Append(' ', length);
                            currentVisualColumn += length;
                        }
                        else
                        {
                            stringBuilder.Append(chr);
                            if (!char.IsLowSurrogate(chr))
                            {
                                ++currentVisualColumn;
                            }
                        }
                    }
                    layout.Text = stringBuilder.ToString();

                    int visualOffset = 1;
                    foreach (var chunk in chunks)
                    {
                        var chunkStyle = style.GetChunkStyle(chunk);
                        visualOffset = DrawLinePortion(cr, chunkStyle, layout, line, visualOffset, chunk.Length);
                    }

                    //layoutDict[line] = layout;
                }

                cr.DrawTextLayout(layout, x, y);

                if (editor.CaretVisible && editor.Caret.Line == lineNumber)
                {
                    cr.SetColor(Colors.Black);
                    cr.Rectangle(x + ColumnToX(line, editor.Caret.Column), y, caretWidth, LineHeight);
                    cr.Fill();
                }
            }
        }

        public LogLevelChooser(LogLevel selectedLogLevel)
        {
            SelectedLogLevel = selectedLogLevel;

            // prerender
            string[] logNames = Enum.GetNames(typeof(LogLevel));
            int length = logNames.Length;
            renderedImage = new Image[length];

            using (TextLayout text = new TextLayout()) {
                for (int i = 0; i < length; i++) {
                    text.Text = logNames[i];
                    Size size = text.GetSize();
                    using (ImageBuilder ib = new ImageBuilder(size.Width + size.Height*2 + 3, size.Height)) {
                        Color color = Color.FromName(Log.LevelToColorString((LogLevel) i));

                        Draw(ib.Context, (LogLevel) i, color);
                        renderedImage[i] = ib.ToBitmap();

                        Button button = new Button { Image = renderedImage[i], ImagePosition = ContentPosition.Left };
                        button.HorizontalPlacement = WidgetPlacement.Start;
                        button.Margin = 0;
                        button.ExpandHorizontal = true;
                        button.Style = ButtonStyle.Flat;
                        buttons.PackStart(button, true, true);

                        button.CanGetFocus = false;
                        button.Tag = i;
                        button.Clicked += OnLogChange;

                        windowHeight += size.Height * 2;
                    }
                }
            }

            // hide window on lost fokus
            buttons.CanGetFocus = true;
            buttons.LostFocus += delegate {
                if (menuHide != null) {
                    menuHide(this, EventArgs.Empty);
                }

                popupWindow.Hide();
            };
            buttons.ButtonPressed += delegate {
                // do nothing
                // workaround to propagate event to each button
            };

            buttons.Spacing = 0;

            popupWindow.Padding = 0;
            popupWindow.ShowInTaskbar = false;
            popupWindow.Decorated = false;
            popupWindow.Content = buttons;
        }

		internal protected override void OptionsChanged ()
		{
			var layout = new TextLayout (Editor);
			layout.Font = Editor.Options.Font;
			layout.Text = "!";
//			int tmp;
			this.marginWidth = layout.GetSize ().Height;
			marginWidth *= 12;
			marginWidth /= 10;
			layout.Dispose ();
		}

		protected override void OnDraw (Context ctx, Rectangle cellArea)
		{
			PackageViewModel packageViewModel = GetValue (PackageField);
			if (packageViewModel == null) {
				return;
			}

			FillCellBackground (ctx);
			UpdateTextColor (ctx);

			DrawCheckBox (ctx, packageViewModel, cellArea);
			DrawPackageImage (ctx, cellArea);

			double packageIdWidth = cellArea.Width - packageDescriptionPadding.HorizontalSpacing - packageDescriptionLeftOffset;

			// Package download count.
			if (packageViewModel.HasDownloadCount) {
				var downloadCountTextLayout = new TextLayout ();
				downloadCountTextLayout.Text = packageViewModel.GetDownloadCountOrVersionDisplayText ();
				Size size = downloadCountTextLayout.GetSize ();
				Point location = new Point (cellArea.Right - packageDescriptionPadding.Right, cellArea.Top + packageDescriptionPadding.Top);
				Point downloadLocation = location.Offset (-size.Width, 0);
				ctx.DrawTextLayout (downloadCountTextLayout, downloadLocation);

				packageIdWidth = downloadLocation.X - cellArea.Left - packageIdRightHandPaddingWidth - packageDescriptionPadding.HorizontalSpacing - packageDescriptionLeftOffset;
			}

			// Package Id.
			var packageIdTextLayout = new TextLayout ();
			packageIdTextLayout.Font = packageIdTextLayout.Font.WithSize (12);
			packageIdTextLayout.Markup = packageViewModel.GetNameMarkup ();
			packageIdTextLayout.Trimming = TextTrimming.WordElipsis;
			Size packageIdTextSize = packageIdTextLayout.GetSize ();
			packageIdTextLayout.Width = packageIdWidth;
			ctx.DrawTextLayout (
				packageIdTextLayout,
				cellArea.Left + packageDescriptionPadding.Left + packageDescriptionLeftOffset,
				cellArea.Top + packageDescriptionPadding.Top);

			// Package description.
			var descriptionTextLayout = new TextLayout ();
			descriptionTextLayout.Font = descriptionTextLayout.Font.WithSize (11);
			descriptionTextLayout.Width = cellArea.Width - packageDescriptionPadding.HorizontalSpacing - packageDescriptionLeftOffset;
			descriptionTextLayout.Height = cellArea.Height - packageIdTextSize.Height - packageDescriptionPadding.VerticalSpacing;
			descriptionTextLayout.Text = packageViewModel.Summary;
			descriptionTextLayout.Trimming = TextTrimming.Word;

			ctx.DrawTextLayout (
				descriptionTextLayout,
				cellArea.Left + packageDescriptionPadding.Left + packageDescriptionLeftOffset,
				cellArea.Top + packageIdTextSize.Height + packageDescriptionPaddingHeight + packageDescriptionPadding.Top);
		}

			protected override void OnDraw (Context ctx, Rectangle dirtyRect)
			{
				base.OnDraw (ctx, dirtyRect);

				ctx.Rectangle (0, 0, Size.Width, Size.Height);
				ctx.SetColor (Colors.LightGray);
				ctx.Fill ();

				ctx.SetColor (Colors.Black);
				using (var layout = new TextLayout (this))
				{
					layout.Text = text;
					ctx.DrawTextLayout (layout, new Point (0, 20));
				}
			}

		protected override LayoutWrapper RenderLine (long line)
		{
			var layout = new TextLayout (Editor);
			layout.Font = Editor.Options.Font;
			StringBuilder sb = new StringBuilder ();
			long startOffset = line * Editor.BytesInRow;
			long endOffset   = System.Math.Min (startOffset + Editor.BytesInRow, Data.Length);
			byte[] lineBytes = Data.GetBytes (startOffset, (int)(endOffset - startOffset));
			switch (Editor.Options.StringRepresentationType) {
			case StringRepresentationTypes.ASCII:
				for (int i = 0; i < lineBytes.Length; i++) {
					byte b = lineBytes [i];
					char ch = (char)b;
					if (!char.IsControl (ch)) {
						sb.Append (ch);
					} else {
						sb.Append (".");
					}
				}
				break;
			case StringRepresentationTypes.UTF16:
				for (int i = 0; i < lineBytes.Length - 1; i += 2) {

					char ch = Encoding.Unicode.GetChars (lineBytes, i, 2) [0];
					if (char.IsLetterOrDigit (ch) || char.IsWhiteSpace (ch) || char.IsSymbol (ch) || char.IsPunctuation (ch))
						sb.Append (ch);
					else
						sb.Append (".");
				}
				break;
			default:
				throw new NotImplementedException (Editor.Options.StringRepresentationType.ToString ());
			}
			
			layout.Text = sb.ToString ();
			Margin.LayoutWrapper result = new LayoutWrapper (layout);
			if (Data.IsSomethingSelected) {
				ISegment selection = Data.MainSelection.Segment;
				HandleSelection (selection.Offset, selection.EndOffset, startOffset, endOffset, null, delegate(long start, long end) {
					result.Layout.SetForeground (Style.Selection, (int)(start - startOffset)/2, (int)(end - start)/2);
					result.Layout.SetBackground (Style.SelectionBg, (int)(start - startOffset)/2, (int)(end - start)/2);
				});
			}
			return result;
		}

        protected internal override void Draw(Context cr, Xwt.Rectangle area, DocumentLine line, int lineNumber, double x, double y, double height)
        {
            if (lineNumber <= editor.Document.LineCount)
            {
                TextLayout layout;
                if (!layoutDict.TryGetValue(lineNumber, out layout))
                {
                    layout = new TextLayout();
                    layout.Font = editor.Options.EditorFont;
                    layout.Text = lineNumber.ToString();

                    layoutDict[lineNumber] = layout;
                }

                cr.SetColor(Colors.Black);
                cr.DrawTextLayout(layout, x + leftPadding, y);
            }
        }

        int DrawLinePortion(Context cr, ChunkStyle style, TextLayout layout, DocumentLine line, int visualOffset, int logicalLength)
        {
            int logicalColumn = line.GetLogicalColumn(editor, visualOffset);
            int logicalEndColumn = logicalColumn + logicalLength;
            int visualEndOffset = line.GetVisualColumn(editor, logicalEndColumn);

            int visualLength = visualEndOffset - visualOffset;

            int indexOffset = visualOffset - 1;

            layout.SetFontStyle(style.FontStyle, indexOffset, visualLength);
            layout.SetFontWeight(style.FontWeight, indexOffset, visualLength);
            if (style.Underline)
                layout.SetUnderline(indexOffset, visualLength);
            layout.SetForeground(style.Foreground, indexOffset, visualLength);

            return visualEndOffset;
        }

        protected override void OnDraw(Context ctx, Rectangle dirtyRect)
        {
            base.OnDraw(ctx, dirtyRect);

            ctx.SetColor(Colors.Gray);
            ctx.SetLineWidth(1);

            ctx.RoundRectangle(0, Padding.Top / 2 - .5, Width - 4.5, Height - Padding.Bottom * 1.5, 3);
            ctx.Stroke();

            var tl = new TextLayout(this) { Text = title, Width = Width - Padding.Left - Padding.Right / 2 };

            ctx.SetColor(Colors.White);
            ctx.Rectangle(Padding.Left, 0, tl.GetSize().Width, Padding.Top);
            ctx.Fill();

            ctx.SetColor(Colors.Black);
            ctx.DrawTextLayout(tl, Padding.Left, 0);
        }

		internal protected override void OptionsChanged ()
		{
			var layout = new TextLayout (Editor);
			layout.Font = Editor.Options.Font;
			string groupString = new string ('0', Editor.Options.GroupBytes * 2);
			layout.Text = groupString + " ";
			double lineHeight;
			var sz = layout.GetSize ();
			groupWidth = sz.Width;
			lineHeight = sz.Height;
			 
			Data.LineHeight = lineHeight;
			
			layout.Text = "00";
			byteWidth = layout.GetSize ().Width;

			layout.Dispose ();
			
//			tabArray = new Pango.TabArray (1, true);
//			tabArray.SetTab (0, Pango.TabAlign.Left, groupWidth);
		}