CentralizedControl/HandyControl/HandyControl_Shared/Controls/Text/SimpleText.cs

using System;
using System.ComponentModel;
using System.Windows;
using System.Windows.Documents;
using System.Windows.Media;
using HandyControl.Data;
using HandyControl.Tools.Helper;

namespace HandyControl.Controls;

public class SimpleText : FrameworkElement
{
    private FormattedText _formattedText;

    static SimpleText()
    {
        SnapsToDevicePixelsProperty.OverrideMetadata(typeof(SimpleText), new FrameworkPropertyMetadata(ValueBoxes.TrueBox));
        UseLayoutRoundingProperty.OverrideMetadata(typeof(SimpleText), new FrameworkPropertyMetadata(ValueBoxes.TrueBox));
    }

    public static readonly DependencyProperty TextProperty = DependencyProperty.Register(
        nameof(Text), typeof(string), typeof(SimpleText), new FrameworkPropertyMetadata(
            string.Empty,
            FrameworkPropertyMetadataOptions.AffectsMeasure |
            FrameworkPropertyMetadataOptions.AffectsRender, OnFormattedTextInvalidated));

    public string Text
    {
        get => (string) GetValue(TextProperty);
        set => SetValue(TextProperty, value);
    }

    public static readonly DependencyProperty TextAlignmentProperty = DependencyProperty.Register(
        nameof(TextAlignment), typeof(TextAlignment), typeof(SimpleText),
        new PropertyMetadata(default(TextAlignment), OnFormattedTextUpdated));

    public TextAlignment TextAlignment
    {
        get => (TextAlignment) GetValue(TextAlignmentProperty);
        set => SetValue(TextAlignmentProperty, value);
    }

    public static readonly DependencyProperty TextTrimmingProperty = DependencyProperty.Register(
        nameof(TextTrimming), typeof(TextTrimming), typeof(SimpleText),
        new PropertyMetadata(default(TextTrimming), OnFormattedTextInvalidated));

    public TextTrimming TextTrimming
    {
        get => (TextTrimming) GetValue(TextTrimmingProperty);
        set => SetValue(TextTrimmingProperty, value);
    }

    public static readonly DependencyProperty TextWrappingProperty = DependencyProperty.Register(
        nameof(TextWrapping), typeof(TextWrapping), typeof(SimpleText),
        new PropertyMetadata(TextWrapping.NoWrap, OnFormattedTextInvalidated));

    public TextWrapping TextWrapping
    {
        get => (TextWrapping) GetValue(TextWrappingProperty);
        set => SetValue(TextWrappingProperty, value);
    }

    public static readonly DependencyProperty ForegroundProperty = DependencyProperty.Register(
        nameof(Foreground), typeof(Brush), typeof(SimpleText), new PropertyMetadata(Brushes.Black, OnFormattedTextUpdated));

    public Brush Foreground
    {
        get => (Brush) GetValue(ForegroundProperty);
        set => SetValue(ForegroundProperty, value);
    }

    public static readonly DependencyProperty FontFamilyProperty = TextElement.FontFamilyProperty.AddOwner(
        typeof(SimpleText),
        new FrameworkPropertyMetadata(OnFormattedTextUpdated));

    public FontFamily FontFamily
    {
        get => (FontFamily) GetValue(FontFamilyProperty);
        set => SetValue(FontFamilyProperty, value);
    }

    public static readonly DependencyProperty FontSizeProperty = TextElement.FontSizeProperty.AddOwner(
        typeof(SimpleText),
        new FrameworkPropertyMetadata(OnFormattedTextUpdated));

    [TypeConverter(typeof(FontSizeConverter))]
    public double FontSize
    {
        get => (double) GetValue(FontSizeProperty);
        set => SetValue(FontSizeProperty, value);
    }

    public static readonly DependencyProperty FontStretchProperty = TextElement.FontStretchProperty.AddOwner(
        typeof(SimpleText),
        new FrameworkPropertyMetadata(OnFormattedTextUpdated));

    public FontStretch FontStretch
    {
        get => (FontStretch) GetValue(FontStretchProperty);
        set => SetValue(FontStretchProperty, value);
    }

    public static readonly DependencyProperty FontStyleProperty = TextElement.FontStyleProperty.AddOwner(
        typeof(SimpleText),
        new FrameworkPropertyMetadata(OnFormattedTextUpdated));

    public FontStyle FontStyle
    {
        get => (FontStyle) GetValue(FontStyleProperty);
        set => SetValue(FontStyleProperty, value);
    }

    public static readonly DependencyProperty FontWeightProperty = TextElement.FontWeightProperty.AddOwner(
        typeof(SimpleText),
        new FrameworkPropertyMetadata(OnFormattedTextUpdated));

    public FontWeight FontWeight
    {
        get => (FontWeight) GetValue(FontWeightProperty);
        set => SetValue(FontWeightProperty, value);
    }

    protected override void OnRender(DrawingContext drawingContext) => drawingContext.DrawText(_formattedText, new Point());

    private void EnsureFormattedText()
    {
        if (_formattedText != null || Text == null)
        {
            return;
        }

        _formattedText = TextHelper.CreateFormattedText(Text, FlowDirection,
            new Typeface(FontFamily, FontStyle, FontWeight, FontStretch), FontSize);

        UpdateFormattedText();
    }

    private void UpdateFormattedText()
    {
        if (_formattedText == null)
        {
            return;
        }

        _formattedText.MaxLineCount = TextWrapping == TextWrapping.NoWrap ? 1 : int.MaxValue;
        _formattedText.TextAlignment = TextAlignment;
        _formattedText.Trimming = TextTrimming;

        _formattedText.SetFontSize(FontSize);
        _formattedText.SetFontStyle(FontStyle);
        _formattedText.SetFontWeight(FontWeight);
        _formattedText.SetFontFamily(FontFamily);
        _formattedText.SetFontStretch(FontStretch);
        _formattedText.SetForegroundBrush(Foreground);
    }

    private static void OnFormattedTextUpdated(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        var outlinedTextBlock = (SimpleText) d;
        outlinedTextBlock.UpdateFormattedText();

        outlinedTextBlock.InvalidateMeasure();
        outlinedTextBlock.InvalidateVisual();
    }

    private static void OnFormattedTextInvalidated(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        var outlinedTextBlock = (SimpleText) d;
        outlinedTextBlock._formattedText = null;

        outlinedTextBlock.InvalidateMeasure();
        outlinedTextBlock.InvalidateVisual();
    }

    protected override Size MeasureOverride(Size availableSize)
    {
        EnsureFormattedText();

        _formattedText.MaxTextWidth = Math.Min(3579139, availableSize.Width);
        _formattedText.MaxTextHeight = Math.Max(0.0001d, availableSize.Height);

        return new Size(_formattedText.Width, _formattedText.Height);
    }
}