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277
MetroGauges/PaletteHelper.cs
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277
MetroGauges/PaletteHelper.cs
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using MaterialDesignColors;
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using MaterialDesignThemes.Wpf;
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using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Text.RegularExpressions;
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using System.Threading.Tasks;
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using System.Windows;
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using System.Windows.Media;
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using System.Windows.Media.Animation;
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namespace MetroGauges
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{
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public class PaletteHelper
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{
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public virtual void SetLightDark(bool isDark)
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{
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var existingResourceDictionary = Application.Current.Resources.MergedDictionaries
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.Where(rd => rd.Source != null)
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.SingleOrDefault(rd => Regex.Match(rd.Source.OriginalString, @"(\/MaterialDesignThemes.Wpf;component\/Themes\/MaterialDesignTheme\.)((Light)|(Dark))").Success);
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if (existingResourceDictionary == null)
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throw new ApplicationException("Unable to find Light/Dark base theme in Application resources.");
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var source =
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$"pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.{(isDark ? "Dark" : "Light")}.xaml";
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var newResourceDictionary = new ResourceDictionary() { Source = new Uri(source) };
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Application.Current.Resources.MergedDictionaries.Remove(existingResourceDictionary);
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Application.Current.Resources.MergedDictionaries.Add(newResourceDictionary);
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var existingMahAppsResourceDictionary = Application.Current.Resources.MergedDictionaries
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.Where(rd => rd.Source != null)
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.SingleOrDefault(rd => Regex.Match(rd.Source.OriginalString, @"(\/MahApps.Metro;component\/Styles\/Accents\/)((BaseLight)|(BaseDark))").Success);
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if (existingMahAppsResourceDictionary == null) return;
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source =
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$"pack://application:,,,/MahApps.Metro;component/Styles/Accents/{(isDark ? "BaseDark" : "BaseLight")}.xaml";
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var newMahAppsResourceDictionary = new ResourceDictionary { Source = new Uri(source) };
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Application.Current.Resources.MergedDictionaries.Remove(existingMahAppsResourceDictionary);
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Application.Current.Resources.MergedDictionaries.Add(newMahAppsResourceDictionary);
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}
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/// <summary>
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/// Replaces the entire palette
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/// </summary>
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public virtual void ReplacePalette(Palette palette)
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{
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if (palette == null) throw new ArgumentNullException(nameof(palette));
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var allHues = palette.PrimarySwatch.PrimaryHues.ToList();
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ReplacePrimaryColor(
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palette.PrimarySwatch,
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allHues[palette.PrimaryLightHueIndex],
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allHues[palette.PrimaryMidHueIndex],
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allHues[palette.PrimaryDarkHueIndex],
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allHues);
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var accentHue = palette.AccentSwatch.AccentHues.ElementAt(palette.AccentHueIndex);
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ReplaceEntry("SecondaryAccentBrush", new SolidColorBrush(accentHue.Color));
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ReplaceEntry("SecondaryAccentForegroundBrush", new SolidColorBrush(accentHue.Foreground));
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}
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/// <summary>
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/// Replaces the primary colour, selecting a balanced set of hues for the light, mid and dark hues.
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/// </summary>
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/// <param name="swatch"></param>
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public virtual void ReplacePrimaryColor(Swatch swatch)
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{
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if (swatch == null) throw new ArgumentNullException(nameof(swatch));
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var palette = QueryPalette();
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var list = swatch.PrimaryHues.ToList();
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var light = list[palette.PrimaryLightHueIndex];
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var mid = list[palette.PrimaryMidHueIndex];
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var dark = list[palette.PrimaryDarkHueIndex];
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ReplacePrimaryColor(swatch, light, mid, dark, list);
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}
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public virtual void ReplacePrimaryColor(string name)
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{
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if (name == null) throw new ArgumentNullException(nameof(name));
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var swatch = new SwatchesProvider().Swatches.FirstOrDefault(
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s => string.Compare(s.Name, name, StringComparison.InvariantCultureIgnoreCase) == 0);
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if (swatch == null)
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throw new ArgumentException($"No such swatch '{name}'", nameof(name));
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ReplacePrimaryColor(swatch);
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}
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public virtual void ReplaceAccentColor(Swatch swatch)
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{
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if (swatch == null) throw new ArgumentNullException(nameof(swatch));
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var palette = QueryPalette();
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foreach (var color in swatch.AccentHues)
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{
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ReplaceEntry(color.Name, color.Color);
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ReplaceEntry(color.Name + "Foreground", color.Foreground);
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}
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var hue = swatch.AccentHues.ElementAt(palette.AccentHueIndex);
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ReplaceEntry("SecondaryAccentBrush", new SolidColorBrush(hue.Color));
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ReplaceEntry("SecondaryAccentForegroundBrush", new SolidColorBrush(hue.Foreground));
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}
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public virtual void ReplaceAccentColor(string name)
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{
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if (name == null) throw new ArgumentNullException(nameof(name));
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var swatch = new SwatchesProvider().Swatches.FirstOrDefault(
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s => string.Compare(s.Name, name, StringComparison.InvariantCultureIgnoreCase) == 0 && s.IsAccented);
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if (swatch == null)
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throw new ArgumentException($"No such accented swatch '{name}'", nameof(name));
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ReplaceAccentColor(swatch);
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}
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/// <summary>
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/// Attempts to query the current palette configured in the application's resources.
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/// </summary>
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/// <returns></returns>
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/// <exception cref="InvalidOperationException">Thrown if there is any ambiguouty regarding the palette. Provided
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/// standard guidleines have been followed for palette configureation, this should not happen.</exception>
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public Palette QueryPalette()
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{
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//it's not safe to to query for the included swatches, so we find the mid (or accent) colour,
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//& cross match it with the entirety of all available hues to find the owning swatch.
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//TODO could cache this statically
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var swatchesProvider = new SwatchesProvider();
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var swatchByPrimaryHueIndex = swatchesProvider
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.Swatches
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.SelectMany(s => s.PrimaryHues.Select(h => new { s, h }))
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.ToDictionary(a => a.h.Color, a => a.s);
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var swatchByAccentHueIndex = swatchesProvider
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.Swatches
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.Where(s => s.IsAccented)
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.SelectMany(s => s.AccentHues.Select(h => new { s, h }))
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.ToDictionary(a => a.h.Color, a => a.s);
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var primaryMidBrush = GetBrush("PrimaryHueMidBrush");
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var accentBrush = GetBrush("SecondaryAccentBrush");
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if (!swatchByPrimaryHueIndex.TryGetValue(primaryMidBrush.Color, out Swatch primarySwatch))
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throw new InvalidOperationException("PrimaryHueMidBrush is not from standard swatches");
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if (!swatchByAccentHueIndex.TryGetValue(accentBrush.Color, out Swatch accentSwatch))
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throw new InvalidOperationException("SecondaryAccentBrush is not from standard swatches");
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var primaryLightBrush = GetBrush("PrimaryHueLightBrush");
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var primaryDarkBrush = GetBrush("PrimaryHueDarkBrush");
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var primaryLightHueIndex = GetHueIndex(primarySwatch, primaryLightBrush.Color, false);
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var primaryMidHueIndex = GetHueIndex(primarySwatch, primaryMidBrush.Color, false);
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var primaryDarkHueIndex = GetHueIndex(primarySwatch, primaryDarkBrush.Color, false);
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var accentHueIndex = GetHueIndex(accentSwatch, accentBrush.Color, true);
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return new Palette(primarySwatch, accentSwatch, primaryLightHueIndex, primaryMidHueIndex, primaryDarkHueIndex, accentHueIndex);
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}
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private static void ReplacePrimaryColor(Swatch swatch, Hue light, Hue mid, Hue dark, IList<Hue> allHues)
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{
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foreach (var color in swatch.PrimaryHues)
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{
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ReplaceEntry(color.Name, color.Color);
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ReplaceEntry(color.Name + "Foreground", color.Foreground);
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}
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ReplaceEntry("PrimaryHueLightBrush", new SolidColorBrush(light.Color));
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ReplaceEntry("PrimaryHueLightForegroundBrush", new SolidColorBrush(light.Foreground));
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ReplaceEntry("PrimaryHueMidBrush", new SolidColorBrush(mid.Color));
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ReplaceEntry("PrimaryHueMidForegroundBrush", new SolidColorBrush(mid.Foreground));
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ReplaceEntry("PrimaryHueDarkBrush", new SolidColorBrush(dark.Color));
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ReplaceEntry("PrimaryHueDarkForegroundBrush", new SolidColorBrush(dark.Foreground));
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//mahapps brushes
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ReplaceEntry("HighlightBrush", new SolidColorBrush(dark.Color));
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ReplaceEntry("AccentColorBrush", new SolidColorBrush(dark.Color));
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ReplaceEntry("AccentColorBrush2", new SolidColorBrush(mid.Color));
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ReplaceEntry("AccentColorBrush3", new SolidColorBrush(light.Color));
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ReplaceEntry("AccentColorBrush4", new SolidColorBrush(light.Color) { Opacity = .82 });
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ReplaceEntry("WindowTitleColorBrush", new SolidColorBrush(dark.Color));
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ReplaceEntry("AccentSelectedColorBrush", new SolidColorBrush(dark.Foreground));
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ReplaceEntry("ProgressBrush", new LinearGradientBrush(dark.Color, mid.Color, 90.0));
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ReplaceEntry("CheckmarkFill", new SolidColorBrush(dark.Color));
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ReplaceEntry("RightArrowFill", new SolidColorBrush(dark.Color));
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ReplaceEntry("IdealForegroundColorBrush", new SolidColorBrush(dark.Foreground));
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ReplaceEntry("IdealForegroundDisabledBrush", new SolidColorBrush(dark.Color) { Opacity = .4 });
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}
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private static int GetHueIndex(Swatch swatch, Color color, bool isAccent)
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{
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var x = (isAccent ? swatch.AccentHues : swatch.PrimaryHues).Select((h, i) => new { h, i })
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.FirstOrDefault(a => a.h.Color == color);
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if (x == null)
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throw new InvalidOperationException($"Color {color} not found in swatch {swatch.Name}.");
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return x.i;
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}
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private static SolidColorBrush GetBrush(string name)
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{
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var group = GetTree(Application.Current.Resources)
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.SelectMany(d => GetEntries(d).Select(e => new { d, e }))
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.Where(a => a.e.Value is SolidColorBrush)
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.GroupBy(a => (SolidColorBrush)a.e.Value)
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.SingleOrDefault(g => g.First().e.Key.Equals(name));
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if (group == null)
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throw new InvalidOperationException($"Unable to safely determine a single resource definition for {name}.");
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var solidColorBrush = group.First().e.Value as SolidColorBrush;
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if (solidColorBrush == null)
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throw new InvalidOperationException($"Expected {name} to be a SolidColorBrush");
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return solidColorBrush;
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}
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private static IEnumerable<DictionaryEntry> GetEntries(IDictionary dictionary)
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{
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var dictionaryEnumerator = dictionary.GetEnumerator();
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while (dictionaryEnumerator.MoveNext())
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{
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yield return dictionaryEnumerator.Entry;
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}
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}
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private static IEnumerable<ResourceDictionary> GetTree(ResourceDictionary node)
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{
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yield return node;
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foreach (var descendant in node.MergedDictionaries.SelectMany(GetTree))
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{
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yield return descendant;
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}
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}
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/// <summary>
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/// Replaces a certain entry anywhere in the parent dictionary and its merged dictionaries
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/// </summary>
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/// <param name="entryName">The entry to replace</param>
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/// <param name="newValue">The new entry value</param>
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/// <param name="parentDictionary">The root dictionary to start searching at. Null means using Application.Current.Resources</param>
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private static void ReplaceEntry(object entryName, object newValue, ResourceDictionary parentDictionary = null)
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{
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if (parentDictionary == null)
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parentDictionary = Application.Current.Resources;
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if (parentDictionary.Contains(entryName))
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{
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var brush = parentDictionary[entryName] as SolidColorBrush;
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if (brush != null && !brush.IsFrozen)
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{
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var animation = new ColorAnimation
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{
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From = ((SolidColorBrush)parentDictionary[entryName]).Color,
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To = ((SolidColorBrush)newValue).Color,
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Duration = new Duration(TimeSpan.FromMilliseconds(300))
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};
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brush.BeginAnimation(SolidColorBrush.ColorProperty, animation);
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}
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else
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parentDictionary[entryName] = newValue; //Set value normally
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}
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foreach (var dictionary in parentDictionary.MergedDictionaries)
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ReplaceEntry(entryName, newValue, dictionary);
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}
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}
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}
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