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using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Markup;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace Tango.SharedUI.Controls
{
[ContentProperty(nameof(Text))]
public class FastTextBlock : Control
{
private FormattedText _formattedText;
static FastTextBlock()
{
}
public FastTextBlock()
{
Loaded += FastTextBlock_Loaded;
}
private void FastTextBlock_Loaded(object sender, RoutedEventArgs e)
{
Init();
}
public static readonly DependencyProperty TextProperty =
DependencyProperty.Register(
"Text",
typeof(string),
typeof(FastTextBlock),
new FrameworkPropertyMetadata(string.Empty, FrameworkPropertyMetadataOptions.AffectsMeasure | FrameworkPropertyMetadataOptions.AffectsRender,
(o, e) => ((FastTextBlock)o).TextPropertyChanged((string)e.NewValue)));
private void TextPropertyChanged(string text)
{
Init();
}
private void Init()
{
if (Text != null)
{
var typeface = new Typeface(
FontFamily,
FontStyle, FontWeight, FontStretch);
_formattedText = new FormattedText(
Text, CultureInfo.CurrentCulture,
FlowDirection.LeftToRight, typeface, FontSize, Foreground);
}
}
public string Text
{
get { return (string)GetValue(TextProperty); }
set { SetValue(TextProperty, value); }
}
protected override void OnRender(DrawingContext drawingContext)
{
if (_formattedText != null)
{
drawingContext.DrawText(_formattedText, new Point());
}
}
protected override Size MeasureOverride(Size constraint)
{
return _formattedText != null
? new Size(_formattedText.Width, _formattedText.Height)
: new Size();
}
}
}
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