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https://gitee.com/akwkevin/aistudio.-wpf.-diagram
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整理整理
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艾竹
309
AIStudio.Wpf.DiagramDesigner.Additionals/Controls/OutlineText.cs
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309
AIStudio.Wpf.DiagramDesigner.Additionals/Controls/OutlineText.cs
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using System;
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using System.ComponentModel;
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using System.Globalization;
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using System.Windows;
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using System.Windows.Documents;
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using System.Windows.Media;
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namespace AIStudio.Wpf.DiagramDesigner.Additionals.Controls
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{
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public class OutlineText : FrameworkElement
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{
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private Pen _pen;
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private FormattedText _formattedText;
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private Geometry _textGeometry;
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private PathGeometry _clipGeometry;
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static OutlineText()
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{
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SnapsToDevicePixelsProperty.OverrideMetadata(typeof(OutlineText), new FrameworkPropertyMetadata(true));
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UseLayoutRoundingProperty.OverrideMetadata(typeof(OutlineText), new FrameworkPropertyMetadata(true));
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}
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public static readonly DependencyProperty StrokePositionProperty = DependencyProperty.Register(
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"StrokePosition", typeof(StrokePosition), typeof(OutlineText), new PropertyMetadata(default(StrokePosition)));
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public StrokePosition StrokePosition
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{
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get => (StrokePosition)GetValue(StrokePositionProperty);
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set => SetValue(StrokePositionProperty, value);
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}
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public static readonly DependencyProperty TextProperty = DependencyProperty.Register(
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"Text", typeof(string), typeof(OutlineText), new FrameworkPropertyMetadata(
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string.Empty,
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FrameworkPropertyMetadataOptions.AffectsMeasure |
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FrameworkPropertyMetadataOptions.AffectsRender, OnFormattedTextInvalidated));
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public string Text
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{
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get => (string)GetValue(TextProperty);
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set => SetValue(TextProperty, value);
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}
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public static readonly DependencyProperty TextAlignmentProperty = DependencyProperty.Register(
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"TextAlignment", typeof(TextAlignment), typeof(OutlineText),
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new PropertyMetadata(default(TextAlignment), OnFormattedTextUpdated));
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public TextAlignment TextAlignment
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{
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get => (TextAlignment)GetValue(TextAlignmentProperty);
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set => SetValue(TextAlignmentProperty, value);
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}
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public static readonly DependencyProperty TextTrimmingProperty = DependencyProperty.Register(
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"TextTrimming", typeof(TextTrimming), typeof(OutlineText),
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new PropertyMetadata(default(TextTrimming), OnFormattedTextInvalidated));
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public TextTrimming TextTrimming
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{
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get => (TextTrimming)GetValue(TextTrimmingProperty);
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set => SetValue(TextTrimmingProperty, value);
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}
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public static readonly DependencyProperty TextWrappingProperty = DependencyProperty.Register(
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"TextWrapping", typeof(TextWrapping), typeof(OutlineText),
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new PropertyMetadata(TextWrapping.NoWrap, OnFormattedTextInvalidated));
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public TextWrapping TextWrapping
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{
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get => (TextWrapping)GetValue(TextWrappingProperty);
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set => SetValue(TextWrappingProperty, value);
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}
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public static readonly DependencyProperty FillProperty = DependencyProperty.Register(
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"Fill", typeof(Brush), typeof(OutlineText), new PropertyMetadata(Brushes.Black, OnFormattedTextUpdated));
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public Brush Fill
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{
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get => (Brush)GetValue(FillProperty);
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set => SetValue(FillProperty, value);
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}
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public static readonly DependencyProperty StrokeProperty = DependencyProperty.Register(
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"Stroke", typeof(Brush), typeof(OutlineText), new PropertyMetadata(Brushes.Black, OnFormattedTextUpdated));
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public Brush Stroke
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{
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get => (Brush)GetValue(StrokeProperty);
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set => SetValue(StrokeProperty, value);
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}
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public static readonly DependencyProperty StrokeThicknessProperty = DependencyProperty.Register(
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"StrokeThickness", typeof(double), typeof(OutlineText), new PropertyMetadata(0d, OnFormattedTextUpdated));
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public double StrokeThickness
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{
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get => (double)GetValue(StrokeThicknessProperty);
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set => SetValue(StrokeThicknessProperty, value);
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}
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public static readonly DependencyProperty FontFamilyProperty = TextElement.FontFamilyProperty.AddOwner(
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typeof(OutlineText),
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new FrameworkPropertyMetadata(OnFormattedTextUpdated));
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public FontFamily FontFamily
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{
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get => (FontFamily)GetValue(FontFamilyProperty);
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set => SetValue(FontFamilyProperty, value);
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}
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public static readonly DependencyProperty FontSizeProperty = TextElement.FontSizeProperty.AddOwner(
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typeof(OutlineText),
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new FrameworkPropertyMetadata(OnFormattedTextUpdated));
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[TypeConverter(typeof(FontSizeConverter))]
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public double FontSize
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{
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get => (double)GetValue(FontSizeProperty);
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set => SetValue(FontSizeProperty, value);
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}
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public static readonly DependencyProperty FontStretchProperty = TextElement.FontStretchProperty.AddOwner(
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typeof(OutlineText),
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new FrameworkPropertyMetadata(OnFormattedTextUpdated));
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public FontStretch FontStretch
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{
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get => (FontStretch)GetValue(FontStretchProperty);
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set => SetValue(FontStretchProperty, value);
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}
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public static readonly DependencyProperty FontStyleProperty = TextElement.FontStyleProperty.AddOwner(
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typeof(OutlineText),
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new FrameworkPropertyMetadata(OnFormattedTextUpdated));
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public FontStyle FontStyle
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{
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get => (FontStyle)GetValue(FontStyleProperty);
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set => SetValue(FontStyleProperty, value);
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}
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public static readonly DependencyProperty FontWeightProperty = TextElement.FontWeightProperty.AddOwner(
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typeof(OutlineText),
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new FrameworkPropertyMetadata(OnFormattedTextUpdated));
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public FontWeight FontWeight
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{
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get => (FontWeight)GetValue(FontWeightProperty);
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set => SetValue(FontWeightProperty, value);
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}
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public static readonly DependencyProperty TextDecorationsProperty = DependencyProperty.Register(
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"TextDecorations", typeof(TextDecorationCollection), typeof(OutlineText), new PropertyMetadata(null, OnFormattedTextUpdated));
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public TextDecorationCollection TextDecorations
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{
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get => (TextDecorationCollection)GetValue(TextDecorationsProperty);
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set => SetValue(TextDecorationsProperty, value);
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}
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protected override void OnRender(DrawingContext drawingContext)
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{
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EnsureGeometry();
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drawingContext.DrawGeometry(Fill, null, _textGeometry);
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if (StrokePosition == StrokePosition.Outside)
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{
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drawingContext.PushClip(_clipGeometry);
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}
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else if (StrokePosition == StrokePosition.Inside)
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{
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drawingContext.PushClip(_textGeometry);
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}
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drawingContext.DrawGeometry(null, _pen, _textGeometry);
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if (StrokePosition == StrokePosition.Outside || StrokePosition == StrokePosition.Inside)
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{
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drawingContext.Pop();
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}
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}
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private void UpdatePen()
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{
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_pen = new Pen(Stroke, StrokeThickness);
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//if (StrokePosition == StrokePosition.Outside || StrokePosition == StrokePosition.Inside)
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//{
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// _pen.Thickness = StrokeThickness * 2;
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//}
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}
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private void EnsureFormattedText()
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{
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if (_formattedText != null || Text == null)
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{
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return;
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}
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#if true
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_formattedText = new FormattedText(
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Text,
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CultureInfo.CurrentUICulture,
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FlowDirection,
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new Typeface(FontFamily, FontStyle, FontWeight, FontStretch),
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FontSize, Fill);
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#else
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var source = PresentationSource.FromVisual(this);
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var dpi = 1.0;
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if (source?.CompositionTarget != null)
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{
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dpi = 96.0 * source.CompositionTarget.TransformToDevice.M11 / 96.0;
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}
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_formattedText = new FormattedText(
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Text,
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CultureInfo.CurrentUICulture,
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FlowDirection,
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new Typeface(FontFamily, FontStyle, FontWeight, FontStretch),
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FontSize, Fill, dpi);
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#endif
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UpdateFormattedText();
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}
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private void EnsureGeometry()
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{
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if (_textGeometry != null)
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{
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return;
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}
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EnsureFormattedText();
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_textGeometry = _formattedText.BuildGeometry(new Point(0, 0));
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if (StrokePosition == StrokePosition.Outside)
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{
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var geometry = new RectangleGeometry(new Rect(0, 0, ActualWidth, ActualHeight));
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_clipGeometry = Geometry.Combine(geometry, _textGeometry, GeometryCombineMode.Exclude, null);
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}
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}
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private void UpdateFormattedText()
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{
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if (_formattedText == null)
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{
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return;
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}
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_formattedText.MaxLineCount = TextWrapping == TextWrapping.NoWrap ? 1 : int.MaxValue;
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_formattedText.TextAlignment = TextAlignment;
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_formattedText.Trimming = TextTrimming;
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_formattedText.SetFontSize(FontSize);
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_formattedText.SetFontStyle(FontStyle);
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_formattedText.SetFontWeight(FontWeight);
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_formattedText.SetFontFamily(FontFamily);
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_formattedText.SetFontStretch(FontStretch);
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_formattedText.SetTextDecorations(TextDecorations);
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}
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private static void OnFormattedTextUpdated(DependencyObject d, DependencyPropertyChangedEventArgs e)
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{
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var outlinedTextBlock = (OutlineText)d;
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outlinedTextBlock.UpdateFormattedText();
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outlinedTextBlock._textGeometry = null;
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outlinedTextBlock.InvalidateMeasure();
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outlinedTextBlock.InvalidateVisual();
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}
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private static void OnFormattedTextInvalidated(DependencyObject d, DependencyPropertyChangedEventArgs e)
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{
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var outlinedTextBlock = (OutlineText)d;
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outlinedTextBlock._formattedText = null;
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outlinedTextBlock._textGeometry = null;
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outlinedTextBlock.InvalidateMeasure();
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outlinedTextBlock.InvalidateVisual();
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}
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protected override Size MeasureOverride(Size availableSize)
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{
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EnsureFormattedText();
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// constrain the formatted text according to the available size
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// the Math.Min call is important - without this constraint (which seems arbitrary, but is the maximum allowable text width), things blow up when availableSize is infinite in both directions
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// the Math.Max call is to ensure we don't hit zero, which will cause MaxTextHeight to throw
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_formattedText.MaxTextWidth = Math.Min(3579139, availableSize.Width);
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_formattedText.MaxTextHeight = Math.Max(0.0001d, availableSize.Height);
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UpdatePen();
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// return the desired size
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return new Size(_formattedText.Width, _formattedText.Height);
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}
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}
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public enum StrokePosition
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{
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Center,
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Outside,
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Inside
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}
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}
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