120 строки
2.8 KiB
C#
120 строки
2.8 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.IO;
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using System.Reflection;
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using System.Runtime.CompilerServices;
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using System.Xml;
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using Xamarin.Forms.Xaml;
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namespace Xamarin.Forms.StyleSheets
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{
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public sealed class StyleSheet : IStyle
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{
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StyleSheet()
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{
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}
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internal IDictionary<Selector, Style> Styles { get; set; } = new Dictionary<Selector, Style>();
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public static StyleSheet FromAssemblyResource(Assembly assembly, string resourceId, IXmlLineInfo lineInfo = null)
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{
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using (var stream = assembly.GetManifestResourceStream(resourceId)) {
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if (stream == null)
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throw new XamlParseException($"No resource found for '{resourceId}'.", lineInfo);
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using (var reader = new StreamReader(stream)) {
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return FromReader(reader);
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}
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}
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}
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//used by code generated by XamlC. Has to stay public
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[EditorBrowsable(EditorBrowsableState.Never)]
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public static StyleSheet FromString(string stylesheet)
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{
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if (stylesheet == null)
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throw new ArgumentNullException(nameof(stylesheet));
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using (var reader = new StringReader(stylesheet))
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return FromReader(reader);
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}
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public static StyleSheet FromReader(TextReader reader)
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{
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if (reader == null)
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throw new ArgumentNullException(nameof(reader));
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return Parse(new CssReader(reader));
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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static StyleSheet Parse(CssReader reader)
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{
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var sheet = new StyleSheet();
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Style style = null;
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var selector = Selector.All;
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int p;
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bool inStyle = false;
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reader.SkipWhiteSpaces();
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while ((p = reader.Peek()) > 0) {
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switch ((char)p) {
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case '@':
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throw new NotSupportedException("AT-rules not supported");
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case '{':
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reader.Read();
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style = Style.Parse(reader, '}');
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inStyle = true;
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break;
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case '}':
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reader.Read();
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if (!inStyle)
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throw new Exception();
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inStyle = false;
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sheet.Styles.Add(selector, style);
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style = null;
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selector = Selector.All;
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break;
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default:
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selector = Selector.Parse(reader, '{');
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break;
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}
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}
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return sheet;
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}
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Type IStyle.TargetType
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=> typeof(VisualElement);
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void IStyle.Apply(BindableObject bindable)
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{
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var styleable = bindable as VisualElement;
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if (styleable == null)
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return;
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Apply(styleable);
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}
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void Apply(VisualElement styleable)
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{
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ApplyCore(styleable);
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foreach (var child in styleable.LogicalChildrenInternal)
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((IStyle)this).Apply(child);
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}
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void ApplyCore(VisualElement styleable)
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{
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foreach (var kvp in Styles) {
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var selector = kvp.Key;
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var style = kvp.Value;
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if (!selector.Matches(styleable))
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continue;
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style.Apply(styleable);
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}
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}
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void IStyle.UnApply(BindableObject bindable)
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{
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throw new NotImplementedException();
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}
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}
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}
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