зеркало из https://github.com/DeGsoft/maui-linux.git
66 строки
2.1 KiB
C#
66 строки
2.1 KiB
C#
using System;
|
|
using System.Threading;
|
|
using System.Threading.Tasks;
|
|
using Microsoft.Graphics.Canvas;
|
|
using Microsoft.Graphics.Canvas.Text;
|
|
using Microsoft.Graphics.Canvas.UI.Xaml;
|
|
using Windows.UI.Xaml.Controls;
|
|
using Windows.UI.Xaml.Media;
|
|
|
|
namespace Xamarin.Forms.Platform.UWP
|
|
{
|
|
public sealed class FontImageSourceHandler : IImageSourceHandler, IIconElementHandler
|
|
{
|
|
float _minimumDpi = 300;
|
|
|
|
public Task<Windows.UI.Xaml.Media.ImageSource> LoadImageAsync(ImageSource imagesource,
|
|
CancellationToken cancelationToken = default(CancellationToken))
|
|
{
|
|
if (!(imagesource is FontImageSource fontsource))
|
|
return null;
|
|
|
|
var device = CanvasDevice.GetSharedDevice();
|
|
var dpi = Math.Max(_minimumDpi, Windows.Graphics.Display.DisplayInformation.GetForCurrentView().LogicalDpi);
|
|
var canvasSize = (float)fontsource.Size + 2;
|
|
|
|
var imageSource = new CanvasImageSource(device, canvasSize, canvasSize, dpi);
|
|
using (var ds = imageSource.CreateDrawingSession(Windows.UI.Colors.Transparent))
|
|
{
|
|
var textFormat = new CanvasTextFormat
|
|
{
|
|
FontFamily = fontsource.FontFamily,
|
|
FontSize = (float)fontsource.Size,
|
|
HorizontalAlignment = CanvasHorizontalAlignment.Center,
|
|
Options = CanvasDrawTextOptions.Default,
|
|
};
|
|
var iconcolor = (fontsource.Color != Color.Default ? fontsource.Color : Color.White).ToWindowsColor();
|
|
|
|
// offset by 1 as we added a 1 inset
|
|
var x = textFormat.FontSize / 2f + 1f;
|
|
var y = -1f;
|
|
ds.DrawText(fontsource.Glyph, x, y, iconcolor, textFormat);
|
|
}
|
|
|
|
return Task.FromResult((Windows.UI.Xaml.Media.ImageSource)imageSource);
|
|
}
|
|
|
|
public Task<IconElement> LoadIconElementAsync(ImageSource imagesource, CancellationToken cancellationToken = default(CancellationToken))
|
|
{
|
|
IconElement image = null;
|
|
|
|
if (imagesource is FontImageSource fontImageSource)
|
|
{
|
|
image = new FontIcon
|
|
{
|
|
Glyph = fontImageSource.Glyph,
|
|
FontFamily = new FontFamily(fontImageSource.FontFamily),
|
|
FontSize = fontImageSource.Size,
|
|
Foreground = fontImageSource.Color.ToBrush()
|
|
};
|
|
}
|
|
|
|
return Task.FromResult(image);
|
|
}
|
|
}
|
|
}
|