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fix(Cupertino): add CupertinoTheme class #1189

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fix(Cupertino): add CupertinoTheme class #1189

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224 changes: 224 additions & 0 deletions src/library/Uno.Cupertino/CupertinoTheme.cs
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using System;
using System.Collections.Generic;
using System.Linq;

#if WinUI
using Microsoft.UI;
using Microsoft.UI.Xaml;
using Microsoft.UI.Xaml.Controls;
using Microsoft.UI.Xaml.Controls.Primitives;
using Microsoft.UI.Xaml.Media;
#else
using Windows.UI;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Media;
#endif

namespace Uno.Cupertino
{
public class CupertinoTheme : ResourceDictionary
{
private bool _isColorOverrideMuted;
private bool _isFontOverrideMuted;

#region FontOverrideSource (DP)
/// <summary>
/// (Optional) Gets or sets a Uniform Resource Identifier (<see cref="Uri"/>) that provides the source location
/// of a <see cref="ResourceDictionary"/> containing overrides for the default Uno.Cupertino <see cref="FontFamily"/> resources
/// </summary>
public string FontOverrideSource
{
get => (string)GetValue(FontOverrideSourceProperty);
set => SetValue(FontOverrideSourceProperty, value);
}

public static DependencyProperty FontOverrideSourceProperty { get; } =
DependencyProperty.Register(
nameof(FontOverrideSource),
typeof(string),
typeof(CupertinoTheme),
new PropertyMetadata(null, OnFontOverrideSourceChanged));

private static void OnFontOverrideSourceChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
if (d is CupertinoTheme theme && e.NewValue is string sourceUri)
{
theme.FontOverrideDictionary = new ResourceDictionary() { Source = new Uri(sourceUri) };
}
}
#endregion

#region ColorOverrideSource (DP)
/// <summary>
/// (Optional) Gets or sets a Uniform Resource Identifier (<see cref="Uri"/>) that provides the source location
/// of a <see cref="ResourceDictionary"/> containing overrides for the default Uno.Cupertino <see cref="Color"/> resources
/// </summary>
/// <remarks>The overrides set here should be re-defining the <see cref="Color"/> resources used by Uno.Cupertino, not the <see cref="SolidColorBrush"/> resources</remarks>
public string ColorOverrideSource
{
get => (string)GetValue(ColorOverrideSourceProperty);
set => SetValue(ColorOverrideSourceProperty, value);
}

public static DependencyProperty ColorOverrideSourceProperty { get; } =
DependencyProperty.Register(
nameof(ColorOverrideSource),
typeof(string),
typeof(CupertinoTheme),
new PropertyMetadata(null, OnColorOverrideSourceChanged));

private static void OnColorOverrideSourceChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
if (d is CupertinoTheme theme && e.NewValue is string sourceUri)
{
theme.ColorOverrideDictionary = new ResourceDictionary() { Source = new Uri(sourceUri) };
}
}
#endregion

#region FontOverrideDictionary (DP)
/// <summary>
/// (Optional) Gets or sets a <see cref="ResourceDictionary"/> containing overrides for the default Uno.Cupertino <see cref="FontFamily"/> resources
/// </summary>
public ResourceDictionary FontOverrideDictionary
{
get => (ResourceDictionary)GetValue(FontOverrideDictionaryProperty);
set => SetValue(FontOverrideDictionaryProperty, value);
}

public static DependencyProperty FontOverrideDictionaryProperty { get; } =
DependencyProperty.Register(
nameof(FontOverrideDictionary),
typeof(ResourceDictionary),
typeof(CupertinoTheme),
new PropertyMetadata(null, OnFontOverrideChanged));

private static void OnFontOverrideChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
if (d is CupertinoTheme { _isFontOverrideMuted: false } theme)
{
theme.UpdateSource();
}
}
#endregion

#region ColorOverrideDictionary (DP)
/// <summary>
/// (Optional) Gets or sets a <see cref="ResourceDictionary"/> containing overrides for the default Uno.Cupertino <see cref="Color"/> resources
/// </summary>
/// <remarks>The overrides set here should be re-defining the <see cref="Color"/> resources used by Uno.Cupertino, not the <see cref="SolidColorBrush"/> resources</remarks>
public ResourceDictionary ColorOverrideDictionary
{
get => (ResourceDictionary)GetValue(ColorOverrideDictionaryProperty);
set => SetValue(ColorOverrideDictionaryProperty, value);
}

public static DependencyProperty ColorOverrideDictionaryProperty { get; } =
DependencyProperty.Register(
nameof(ColorOverrideDictionary),
typeof(ResourceDictionary),
typeof(CupertinoTheme),
new PropertyMetadata(null, OnColorOverrideChanged));

private static void OnColorOverrideChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
if (d is CupertinoTheme { _isColorOverrideMuted: false } theme)
{
theme.UpdateSource();
}
}
#endregion

public CupertinoTheme() : this(colorOverride: null, fontOverride: null)
{

}

public CupertinoTheme(ResourceDictionary colorOverride = null, ResourceDictionary fontOverride = null)
{
if (colorOverride is { })
{
SetColorOverrideSilently(colorOverride);
}

if (fontOverride is { })
{
SetFontOverrideSilently(fontOverride);
}

UpdateSource();
}

private void SetColorOverrideSilently(ResourceDictionary colorOverride)
{
try
{
_isColorOverrideMuted = true;
ColorOverrideDictionary = colorOverride;
}
finally
{
_isColorOverrideMuted = false;
}
}

private void SetFontOverrideSilently(ResourceDictionary fontOverride)
{
try
{
_isFontOverrideMuted = true;
FontOverrideDictionary = fontOverride;
}
finally
{
_isFontOverrideMuted = false;
}
}

private void UpdateSource()
{
#if !HAS_UNO
Source = null;
#endif
ThemeDictionaries.Clear();
MergedDictionaries.Clear();
this.Clear();

var colors = new ResourceDictionary { Source = new Uri("ms-appx:///Uno.Cupertino/Styles/Application/ColorPalette.xaml") };

colors.MergedDictionaries.Add(new ResourceDictionary { Source = new Uri("ms-appx:///Uno.Cupertino/Styles/Application/CupertinoColors.xaml") });

if (ColorOverrideDictionary is { } colorOverride)
{
colors.MergedDictionaries
#if !HAS_UNO
.Add(colorOverride.Duplicate());
#else
.Add(colorOverride);
#endif
}

var mergedPages = new ResourceDictionary { Source = new Uri("ms-appx:///Uno.Cupertino/Generated/mergedpages.xaml") };

var fonts = new ResourceDictionary { Source = new Uri("ms-appx:///Uno.Cupertino/Styles/Application/Fonts.xaml") };

if (FontOverrideDictionary is { } fontOverride)
{
fonts.MergedDictionaries
#if !HAS_UNO
.Add(fontOverride.Duplicate());
#else
.Add(fontOverride);
#endif
}

mergedPages.MergedDictionaries.Add(colors);
mergedPages.MergedDictionaries.Add(fonts);

MergedDictionaries.Add(mergedPages);
}
}
}
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