动态资源合并未将样式应用于第一控件

问题描述 投票：4回答：1

我试图通过将样式资源合并到应用程序资源中，同时将控件添加到UI中来为自定义控件应用新样式，但是新样式第一次不应用于控件。

采样控件

CustomTextBoxExt.cs

 public class CustomTextBoxExt : TextBox
    {
        static CustomTextBoxExt()
        {
            DefaultStyleKeyProperty.OverrideMetadata(typeof(CustomTextBoxExt), new FrameworkPropertyMetadata(typeof(CustomTextBoxExt)));
        }
    }

默认样式Generic.xaml

 <Style x:Key="TextBoxExtStyle" TargetType="{x:Type local:CustomTextBoxExt}">
    <Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.WindowBrushKey}}" />
    <Setter Property="BorderBrush" Value="Red" />
    <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}" />
    <Setter Property="BorderThickness" Value="1" />
    <Setter Property="KeyboardNavigation.TabNavigation" Value="None" />
    <Setter Property="HorizontalContentAlignment" Value="Left" />
    <Setter Property="FocusVisualStyle" Value="{x:Null}" />
    <Setter Property="AllowDrop" Value="True" />
    <Setter Property="ScrollViewer.PanningMode" Value="VerticalFirst" />
    <Setter Property="Stylus.IsFlicksEnabled" Value="False" />
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type local:CustomTextBoxExt}">
                <Border
                    x:Name="border"
                    Background="{TemplateBinding Background}"
                    BorderBrush="{TemplateBinding BorderBrush}"
                    BorderThickness="{TemplateBinding BorderThickness}"
                    SnapsToDevicePixels="True">
                    <ScrollViewer
                        x:Name="PART_ContentHost"
                        Focusable="False"
                        HorizontalScrollBarVisibility="Hidden"
                        VerticalScrollBarVisibility="Hidden" />
                </Border>
                <ControlTemplate.Triggers>
                    <Trigger Property="IsEnabled" Value="False">
                        <Setter TargetName="border" Property="Opacity" Value="0.56" />
                    </Trigger>
                    <Trigger Property="IsMouseOver" Value="True">
                        <Setter TargetName="border" Property="BorderBrush" Value="#FF7EB4EA" />
                    </Trigger>
                    <Trigger Property="IsKeyboardFocused" Value="True">
                        <Setter TargetName="border" Property="BorderBrush" Value="#FF569DE5" />
                    </Trigger>
                </ControlTemplate.Triggers>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
    <Style.Triggers>

        <MultiTrigger>
            <MultiTrigger.Conditions>
                <Condition Property="IsInactiveSelectionHighlightEnabled" Value="True" />
                <Condition Property="IsSelectionActive" Value="False" />
            </MultiTrigger.Conditions>
            <Setter Property="SelectionBrush" Value="{DynamicResource {x:Static SystemColors.InactiveSelectionHighlightBrushKey}}" />
        </MultiTrigger>
    </Style.Triggers>
</Style>
<Style BasedOn="{StaticResource TextBoxExtStyle}" TargetType="{x:Type local:CustomTextBoxExt}" />

自定义主题TextBoxExtStyle.xaml

<Style x:Key="MaterialTextBoxExtStyle" TargetType="{x:Type local:CustomTextBoxExt}">
    <Setter Property="FocusVisualStyle" Value="{x:Null}" />
    <Setter Property="Foreground" Value="#DD000000" />
    <Setter Property="Background" Value="Transparent" />
    <Setter Property="BorderBrush" Value="#FF9E9E9E" />
    <Setter Property="BorderThickness" Value="0,0,0,1" />
    <Setter Property="FontSize" Value="12" />
    <Setter Property="FontWeight" Value="Normal" />
    <Setter Property="SelectionBrush" Value="#FF0279FF" />
    <Setter Property="AllowDrop" Value="true" />
    <Setter Property="KeyboardNavigation.TabNavigation" Value="None" />
    <Setter Property="HorizontalContentAlignment" Value="Left" />
    <Setter Property="VerticalContentAlignment" Value="Center" />
    <Setter Property="AllowDrop" Value="true" />
    <Setter Property="ScrollViewer.PanningMode" Value="VerticalFirst" />
    <Setter Property="Stylus.IsFlicksEnabled" Value="False" />
    <Setter Property="CaretBrush" Value="#DD000000" />
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type local:CustomTextBoxExt}">
                <Grid>
                    <Border
                        x:Name="border"
                        Padding="{TemplateBinding Padding}"
                        Background="{TemplateBinding Background}"
                        BorderBrush="{TemplateBinding BorderBrush}"
                        BorderThickness="{TemplateBinding BorderThickness}"
                        SnapsToDevicePixels="true">
                        <ScrollViewer
                            x:Name="PART_ContentHost"
                            Background="Transparent"
                            Focusable="False"
                            HorizontalScrollBarVisibility="Hidden"
                            VerticalScrollBarVisibility="Hidden" />
                    </Border>
                </Grid>
                <ControlTemplate.Triggers>
                    <Trigger Property="IsMouseOver" Value="true">
                        <Setter TargetName="border" Property="BorderBrush" Value="#FF757575" />
                        <Setter TargetName="border" Property="Background" Value="Transparent" />
                        <Setter Property="Foreground" Value="#DD000000" />
                        <Setter Property="CaretBrush" Value="#DD000000" />
                    </Trigger>
                    <Trigger Property="IsKeyboardFocused" Value="true">
                        <Setter TargetName="border" Property="BorderBrush" Value="#FF0279FF" />
                        <Setter Property="BorderThickness" Value="0,0,0,2" />
                        <Setter Property="Padding" Value="0,0,0,-1" />
                    </Trigger>
                    <Trigger Property="IsEnabled" Value="False">
                        <Setter TargetName="border" Property="Background" Value="Transparent" />
                        <Setter TargetName="border" Property="BorderBrush" Value="#FFE0E0E0" />
                        <Setter Property="Foreground" Value="#60000000" />
                    </Trigger>
                </ControlTemplate.Triggers>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

<Style BasedOn="{StaticResource MaterialTextBoxExtStyle}" TargetType="{x:Type local:CustomTextBoxExt}" />

并使用附加属性，尝试从默认样式更改样式，

public class SkinExt
{
    public static string GetTheme(DependencyObject obj)
    {
        return (string)obj.GetValue(ThemeProperty);
    }

    public static void SetTheme(DependencyObject obj, string value)
    {
        obj.SetValue(ThemeProperty, value);
    }

    // Using a DependencyProperty as the backing store for Theme.  This enables animation, styling, binding, etc...
    public static readonly DependencyProperty ThemeProperty =
        DependencyProperty.RegisterAttached("Theme", typeof(string), typeof(SkinExt), new FrameworkPropertyMetadata(string.Empty, FrameworkPropertyMetadataOptions.Inherits, new PropertyChangedCallback(OnVisualStyleChanged)));


    private static void OnVisualStyleChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        if (e.NewValue != e.OldValue && !string.IsNullOrEmpty(e.NewValue.ToString()) /*&& d is FrameworkElement && (d as FrameworkElement).IsLoaded*/)
        {
            SkinExt.ApplyTheme(d, e.NewValue.ToString());
        }
    }

    internal static void ApplyTheme(DependencyObject obj, string style)
    {
        Type itemType = obj.GetType();

        List<string> styles = GetDictionaries(obj.GetType().Name.ToString(), style);

        if (styles != null && styles.Count > 0)
        {
            foreach (var path in styles)
            {
                var rdict = new ResourceDictionary() { Source = new Uri(path, UriKind.RelativeOrAbsolute) };
                bool alreadyExist = false;
                foreach (var dictionaryFiles in Application.Current.Resources.MergedDictionaries)
                {
                    if (dictionaryFiles.Source.OriginalString.Contains(path))
                    {
                        alreadyExist = true;
                        break;
                    }
                }

                if (!alreadyExist)
                {
                    Application.Current.Resources.MergedDictionaries.Add(rdict);
                    Console.WriteLine(path);
                }
            }

        }
    }

    internal static List<string> GetDictionaries(String type, string style)
    {
        List<string> styles = new List<string>();
        #region Switch

        switch (type)
        {
            case "CustomTextBoxExt":
                styles.Add("/TextBoxExt;component/TextBoxExt/TextBoxExtStyle.xaml");
                break;
            case "ButtonExt":
                styles.Add("/TextBoxExt;component/ButtonExt/ButtonExtStyle.xaml");
                break;
            case "Label":
                styles.Add("/TextBoxExt;component/LabelStyle.xaml");
                break;
        }

        # endregion

        return styles;
    }

}

设置

local:SkinExt.Theme="Material"

在主窗口/网格中，直接添加子项时，按预期工作。但是，当使用下面的lazyextension样式不起作用时。

public static class LazyLoadExtensions
{
    public static LazyUIElementCollection GetLazyChildrens(DependencyObject obj)
    {
        return (LazyUIElementCollection)obj.GetValue(LazyChildrensProperty);
    }

    public static void SetLazyChildrens(DependencyObject obj, LazyUIElementCollection value)
    {
        obj.SetValue(LazyChildrensProperty, value);
    }

    public static readonly DependencyProperty LazyChildrensProperty =
        DependencyProperty.RegisterAttached("LazyChildrens", typeof(LazyUIElementCollection), typeof(LazyLoadExtensions), new PropertyMetadata(OnLazyChildrensChanged));

    private static void OnLazyChildrensChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        var wrapPanel = d as WrapPanel;
        var childrens = LazyLoadExtensions.GetLazyChildrens(wrapPanel);
        for (int i = 0; i < childrens.Count; i++)
        {
            var child = childrens[i];

                wrapPanel.Children.Add(child);
        }

    }
}

public class LazyUIElementCollection : List<UIElement>
{
    public LazyUIElementCollection()
    {

    }
}

Works

 <Grid local:SkinExt.Theme="Material">
    <WrapPanel x:Name="wrapPanel">
        <!--<local:LazyLoadExtensions.LazyChildrens>-->
        <!--<local:LazyUIElementCollection>-->
        <StackPanel Margin="10">
            <TextBlock Margin="0,0,0,8" Text="MS Label" />
            <Label
                Width="200"
                Height="25"
                Content="Material" />
        </StackPanel>
        <StackPanel Margin="10">
            <TextBlock Margin="0,0,0,8" Text="Custom TextBox" />
            <local:CustomTextBoxExt
                Width="200"
                Height="25"
                Text="Material" />
        </StackPanel>
        <!--</local:LazyUIElementCollection>-->
        <!--</local:LazyLoadExtensions.LazyChildrens>-->
    </WrapPanel>
</Grid>

不工作

<Grid local:SkinExt.Theme="Material">
    <WrapPanel x:Name="wrapPanel">
        <local:LazyLoadExtensions.LazyChildrens>
            <local:LazyUIElementCollection>
                <StackPanel Margin="10">
                    <TextBlock Margin="0,0,0,8" Text="MS Label" />
                    <Label
                        Width="200"
                        Height="25"
                        Content="Material" />
                </StackPanel>
                <StackPanel Margin="10">
                    <TextBlock Margin="0,0,0,8" Text="Custom TextBox" />
                    <local:CustomTextBoxExt
                        Width="200"
                        Height="25"
                        Text="Material" />
                </StackPanel>
            </local:LazyUIElementCollection>
        </local:LazyLoadExtensions.LazyChildrens>
    </WrapPanel>
</Grid>

适用于第二个项目

样式正确应用于第二个customtextboxext

<Grid local:SkinExt.Theme="Material">
    <WrapPanel x:Name="wrapPanel">
        <local:LazyLoadExtensions.LazyChildrens>
            <local:LazyUIElementCollection>
                <StackPanel Margin="10">
                    <TextBlock Margin="0,0,0,8" Text="MS Label" />
                    <Label
                        Width="200"
                        Height="25"
                        Content="Material" />
                </StackPanel>
                <StackPanel Margin="10">
                    <TextBlock Margin="0,0,0,8" Text="Custom TextBox" />
                    <local:CustomTextBoxExt
                        Width="200"
                        Height="25"
                        Text="Material" />
                    <local:CustomTextBoxExt
                        Width="200"
                        Height="25"
                        Text="Material" />
                </StackPanel>
            </local:LazyUIElementCollection>
        </local:LazyLoadExtensions.LazyChildrens>
    </WrapPanel>
</Grid>

可复制的样本：https://drive.google.com/open?id=1iB9sY90T7aRaaRTzVc1EvE2qFU13fHG7

检查上面的示例，让我知道您的想法

wpf xaml wpf-controls custom-controls resourcedictionary
1个回答
1
投票

我相信，在达到所需的目标之前，有很多工作要做，这里有一些要点：

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