信息系统开发平台OpenExpressApp － 支持WPF主题样式

　　OpenExpressApp中有一个项目【OpenExpressApp.Module.WPF.Style】，它作为以后UI样式扩展用，以前只是放在那里，其实没有做什么工作，主要也就是告诉大家后期会增加主题样式。前期做框架、做引擎时，由于侧重点不一样，所以有时经常被人说做出来的东西真丑：）所以最近就花了两天把样式扩展加进来了。目前主要从网上下载了微软的一些样式，还没有扩充OEA内部控件的样式，界面如下图：

ThemeManager

　　在【OpenExpressApp.Module.WPF.Style】中有一个ThemeManager.cs单元，这是主题管理的唯一一个类，其余都是各个主题的样式文件。这些都是从网上下载的，由于比较简单，就不做具体介绍了，只把代码附上：

    public static class ThemeManager
    {
        public static ResourceDictionary GetThemeResourceDictionary(string theme)
        {
            if (theme != null)
            {
               // Assembly assembly = Assembly.LoadFrom("OpenExpressApp.Module.WPF.Style");
                string packUri = String.Format(@"/OpenExpressApp.Module.WPF.Style;component/{0}/Theme.xaml", theme);
                return Application.LoadComponent(new Uri(packUri, UriKind.Relative)) as ResourceDictionary;
            }
            return null;
        }

        public static string[] GetThemes()
        {
            string[] themes = new string[] 
            { 
                "朴素","朦胧蓝","ExpressionDark", "ExpressionLight", "RainierOrange", "RainierPurple", "RainierRadialBlue", 
                "ShinyBlue", "ShinyRed", "ShinyDarkTeal", // "ShinyDarkGreen", 
                "ShinyDarkPurple",
                "DavesGlossyControls", "WhistlerBlue", "BureauBlack", "BureauBlue", "BubbleCreme", 
                "UXMusingsRed", "UXMusingsGreen", "UXMusingsRoughRed", "UXMusingsRoughGreen", "UXMusingsBubblyBlue"
            };
            return themes;
        }

        public static void ApplyTheme(this Application app, string theme)
        {
            ResourceDictionary dictionary = ThemeManager.GetThemeResourceDictionary(theme);

            if (dictionary != null)
            {
                app.Resources.MergedDictionaries.Clear();
                app.Resources.MergedDictionaries.Add(dictionary);
            }
        }

        public static void ApplyTheme(this ContentControl control, string theme)
        {
            ResourceDictionary dictionary = ThemeManager.GetThemeResourceDictionary(theme);

            if (dictionary != null)
            {
                control.Resources.MergedDictionaries.Clear();
                control.Resources.MergedDictionaries.Add(dictionary);
            }
        }

        #region Theme

        /// <summary>
        /// Theme Attached Dependency Property
        /// </summary>
        public static readonly DependencyProperty ThemeProperty =
            DependencyProperty.RegisterAttached("Theme", typeof(string), typeof(ThemeManager),
                new FrameworkPropertyMetadata((string)string.Empty,
                    new PropertyChangedCallback(OnThemeChanged)));

        /// <summary>
        /// Gets the Theme property.  This dependency property 
        /// indicates ....
        /// </summary>
        public static string GetTheme(DependencyObject d)
        {
            return (string)d.GetValue(ThemeProperty);
        }

        /// <summary>
        /// Sets the Theme property.  This dependency property 
        /// indicates ....
        /// </summary>
        public static void SetTheme(DependencyObject d, string value)
        {
            d.SetValue(ThemeProperty, value);
        }

        /// <summary>
        /// Handles changes to the Theme property.
        /// </summary>
        private static void OnThemeChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            string theme = e.NewValue as string;
            if (theme == string.Empty)
                return;

            ContentControl control = d as ContentControl;
            if (control != null)
            {
                control.ApplyTheme(theme);
            }
        }

        #endregion