Question

我正在基于MS RibbonControlsLibrary（ 3.5.41019.1 ）以编程方式填充功能区（WPF）。所有图像（最明显的大图像）看起来非常糟糕并且“像素化”：

Screenshot from 2 Ribbon

顶部截图来自“pixly”功能区（图像缩放看起来很糟糕）
底部屏幕截图取自基于WinForms的窗口中的相同区域，源图像相同（图像缩放看起来不错）
所有图片均保存在 32位PNG 48x48

我试图将 BitmapScalingMode 设置为“HighQuality”而没有任何影响，源代码：

BitmapImage img = new BitmapImage();
try
{
    Uri uri = new Uri("pack://application:,,,/UIMainWindow;component/Resources/" + iPictureName);                
    img.BeginInit();
    img.SetValue(BitmapImage.CacheOptionProperty, BitmapCacheOption.OnLoad);
    RenderOptions.SetBitmapScalingMode(img, BitmapScalingMode.HighQuality);
    img.UriSource = uri;
    img.EndInit();
    img.Freeze();
}
catch (Exception ex)
{
    throw new Exception("Creation of image failed: " + ex.Message, ex);
}

问题为什么图像的缩放看起来很糟糕？我该如何解决这个问题？

Answer 1

上述其他答案都没有为我工作，所以我开始自己的调查。将图像大小调整为32x32 几乎修复了问题，但我们的用户具有不同的DPI设置，并且图像无法在其计算机上正确缩放。我还应该注意到我正在使用System.Windows.Controls.Ribbon组件，它的行为可能与RibbonControlsLibrary略有不同。

我发现RibbonButton的默认ControlTemplate专门指定了NearestNeighbor作为位图缩放选项。好消息是，通过将样式放入Window的资源，可以轻松覆盖此控件模板。有点坏消息是控件模板非常冗长。我将系统上的RibbonButton的默认ControlTemplate转储到一个文件，只是更改了位图缩放选项。

首先，如果你还没有这个名称空间声明，那么你需要这个名称空间声明：

xmlns:s="clr-namespace:System;assembly=mscorlib"

然后将此Style放在Window的资源中，以覆盖RibbonButton外观：

<Style TargetType="RibbonButton">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="RibbonButton">
                <Border BorderThickness="{TemplateBinding Border.BorderThickness}" CornerRadius="{TemplateBinding RibbonControlService.CornerRadius}" BorderBrush="{TemplateBinding Border.BorderBrush}" Background="{TemplateBinding Panel.Background}" Name="OuterBorder" SnapsToDevicePixels="True">
                    <Border BorderThickness="{TemplateBinding Border.BorderThickness}" Padding="{TemplateBinding Control.Padding}" CornerRadius="{TemplateBinding RibbonControlService.CornerRadius}" BorderBrush="#00FFFFFF" Name="InnerBorder">
                        <StackPanel Name="StackPanel">
                            <Image Source="{TemplateBinding RibbonControlService.LargeImageSource}" Name="PART_Image" Width="32" Height="32" Margin="{DynamicResource {ComponentResourceKey TypeInTargetAssembly=Ribbon, ResourceId=LargeImageMargin}}" HorizontalAlignment="{TemplateBinding Control.HorizontalContentAlignment}" VerticalAlignment="Center" RenderOptions.BitmapScalingMode="HighQuality" />
                            <Grid Name="Grid" HorizontalAlignment="Center" VerticalAlignment="Center">
                                <RibbonTwoLineText TextAlignment="Center" LineHeight="13" LineStackingStrategy="BlockLineHeight" Text="{TemplateBinding RibbonControlService.Label}" Name="TwoLineText" Margin="1,1,1,0" HorizontalAlignment="Center" VerticalAlignment="Top" />
                            </Grid>
                        </StackPanel>
                    </Border>
                </Border>
                <ControlTemplate.Triggers>
                    <DataTrigger Binding="{Binding Path=ControlSizeDefinition.ImageSize, RelativeSource={RelativeSource Mode=Self}}" Value="Large">
                        <Setter Property="FrameworkElement.MinWidth">
                            <Setter.Value>
                                <s:Double>44</s:Double>
                            </Setter.Value>
                        </Setter>
                        <Setter Property="FrameworkElement.Height">
                            <Setter.Value>
                                <s:Double>66</s:Double>
                            </Setter.Value>
                        </Setter>
                        <Setter Property="FrameworkElement.MinHeight" TargetName="Grid">
                            <Setter.Value>
                                <s:Double>26</s:Double>
                            </Setter.Value>
                        </Setter>
                        <Setter Property="RibbonTwoLineText.HasTwoLines" TargetName="TwoLineText">
                            <Setter.Value>
                                <s:Boolean>True</s:Boolean>
                            </Setter.Value>
                        </Setter>
                    </DataTrigger>
                    <DataTrigger Binding="{Binding Path=ControlSizeDefinition.ImageSize, RelativeSource={RelativeSource Mode=Self}}" Value="Small">
                        <Setter Property="FrameworkElement.Height">
                            <Setter.Value>
                                <s:Double>22</s:Double>
                            </Setter.Value>
                        </Setter>
                        <Setter Property="FrameworkElement.Margin" TargetName="PART_Image">
                            <Setter.Value>
                                <Thickness>1,0,1,0</Thickness>
                            </Setter.Value>
                        </Setter>
                        <Setter Property="Image.Source" TargetName="PART_Image">
                            <Setter.Value>
                                <Binding Path="SmallImageSource" RelativeSource="{RelativeSource Mode=TemplatedParent}" />
                            </Setter.Value>
                        </Setter>
                        <Setter Property="FrameworkElement.Width" TargetName="PART_Image">
                            <Setter.Value>
                                <s:Double>16</s:Double>
                            </Setter.Value>
                        </Setter>
                        <Setter Property="FrameworkElement.Height" TargetName="PART_Image">
                            <Setter.Value>
                                <s:Double>16</s:Double>
                            </Setter.Value>
                        </Setter>
                        <Setter Property="FrameworkElement.HorizontalAlignment" TargetName="TwoLineText">
                            <Setter.Value>
                                <x:Static Member="HorizontalAlignment.Left" />
                            </Setter.Value>
                        </Setter>
                        <Setter Property="FrameworkElement.Margin" TargetName="TwoLineText">
                            <Setter.Value>
                                <Thickness>1,1,1,1</Thickness>
                            </Setter.Value>
                        </Setter>
                        <Setter Property="StackPanel.Orientation" TargetName="StackPanel">
                            <Setter.Value>
                                <x:Static Member="Orientation.Horizontal" />
                            </Setter.Value>
                        </Setter>
                    </DataTrigger>
                    <MultiDataTrigger>
                        <MultiDataTrigger.Conditions>
                            <Condition Binding="{Binding Path=ControlSizeDefinition.ImageSize, RelativeSource={RelativeSource Mode=Self}}" Value="Small" />
                            <Condition Binding="{Binding Path=IsInQuickAccessToolBar, RelativeSource={RelativeSource Mode=Self}}" Value="True" />
                        </MultiDataTrigger.Conditions>
                        <Setter Property="FrameworkElement.Height">
                            <Setter.Value>
                                <s:Double>NaN</s:Double>
                            </Setter.Value>
                        </Setter>
                    </MultiDataTrigger>
                    <DataTrigger Binding="{Binding Path=ControlSizeDefinition.IsLabelVisible, RelativeSource={RelativeSource Mode=Self}}" Value="False">
                        <Setter Property="UIElement.Visibility" TargetName="TwoLineText">
                            <Setter.Value>
                                <x:Static Member="Visibility.Collapsed" />
                            </Setter.Value>
                        </Setter>
                    </DataTrigger>
                    <DataTrigger Binding="{Binding Path=ControlSizeDefinition.ImageSize, RelativeSource={RelativeSource Mode=Self}}" Value="Collapsed">
                        <Setter Property="UIElement.Visibility" TargetName="PART_Image">
                            <Setter.Value>
                                <x:Static Member="Visibility.Collapsed" />
                            </Setter.Value>
                        </Setter>
                    </DataTrigger>
                    <Trigger Property="UIElement.IsMouseOver">
                        <Setter Property="Panel.Background" TargetName="OuterBorder">
                            <Setter.Value>
                                <Binding Path="MouseOverBackground" RelativeSource="{RelativeSource Mode=TemplatedParent}" />
                            </Setter.Value>
                        </Setter>
                        <Setter Property="Border.BorderBrush" TargetName="OuterBorder">
                            <Setter.Value>
                                <Binding Path="MouseOverBorderBrush" RelativeSource="{RelativeSource Mode=TemplatedParent}" />
                            </Setter.Value>
                        </Setter>
                        <Setter Property="Border.BorderBrush" TargetName="InnerBorder">
                            <Setter.Value>
                                <SolidColorBrush>#80FFFFFF</SolidColorBrush>
                            </Setter.Value>
                        </Setter>
                        <Trigger.Value>
                            <s:Boolean>True</s:Boolean>
                        </Trigger.Value>
                    </Trigger>
                    <Trigger Property="UIElement.IsKeyboardFocused">
                        <Setter Property="Panel.Background" TargetName="OuterBorder">
                            <Setter.Value>
                                <Binding Path="FocusedBackground" RelativeSource="{RelativeSource Mode=TemplatedParent}" />
                            </Setter.Value>
                        </Setter>
                        <Setter Property="Border.BorderBrush" TargetName="OuterBorder">
                            <Setter.Value>
                                <Binding Path="FocusedBorderBrush" RelativeSource="{RelativeSource Mode=TemplatedParent}" />
                            </Setter.Value>
                        </Setter>
                        <Setter Property="Border.BorderBrush" TargetName="InnerBorder">
                            <Setter.Value>
                                <SolidColorBrush>#80FFFFFF</SolidColorBrush>
                            </Setter.Value>
                        </Setter>
                        <Trigger.Value>
                            <s:Boolean>True</s:Boolean>
                        </Trigger.Value>
                    </Trigger>
                    <Trigger Property="ButtonBase.IsPressed">
                        <Setter Property="Panel.Background" TargetName="OuterBorder">
                            <Setter.Value>
                                <Binding Path="PressedBackground" RelativeSource="{RelativeSource Mode=TemplatedParent}" />
                            </Setter.Value>
                        </Setter>
                        <Setter Property="Border.BorderBrush" TargetName="OuterBorder">
                            <Setter.Value>
                                <Binding Path="PressedBorderBrush" RelativeSource="{RelativeSource Mode=TemplatedParent}" />
                            </Setter.Value>
                        </Setter>
                        <Setter Property="Border.BorderBrush" TargetName="InnerBorder">
                            <Setter.Value>
                                <SolidColorBrush>#00FFFFFF</SolidColorBrush>
                            </Setter.Value>
                        </Setter>
                        <Trigger.Value>
                            <s:Boolean>True</s:Boolean>
                        </Trigger.Value>
                    </Trigger>
                    <Trigger Property="RibbonControlService.IsInControlGroup">
                        <Setter Property="Border.BorderBrush" TargetName="OuterBorder">
                            <Setter.Value>
                                <Binding Path="Ribbon.BorderBrush" RelativeSource="{RelativeSource Mode=TemplatedParent}" />
                            </Setter.Value>
                        </Setter>
                        <Setter Property="Border.BorderThickness" TargetName="OuterBorder">
                            <Setter.Value>
                                <Thickness>0,0,1,0</Thickness>
                            </Setter.Value>
                        </Setter>
                        <Setter Property="Border.CornerRadius" TargetName="OuterBorder">
                            <Setter.Value>
                                <CornerRadius>0,0,0,0</CornerRadius>
                            </Setter.Value>
                        </Setter>
                        <Setter Property="Border.CornerRadius" TargetName="InnerBorder">
                            <Setter.Value>
                                <CornerRadius>0,0,0,0</CornerRadius>
                            </Setter.Value>
                        </Setter>
                        <Trigger.Value>
                            <s:Boolean>True</s:Boolean>
                        </Trigger.Value>
                    </Trigger>
                    <Trigger Property="UIElement.IsEnabled">
                        <Setter Property="UIElement.Opacity" TargetName="PART_Image">
                            <Setter.Value>
                                <s:Double>0.5</s:Double>
                            </Setter.Value>
                        </Setter>
                        <Setter Property="TextElement.Foreground" TargetName="OuterBorder">
                            <Setter.Value>
                                <SolidColorBrush>#FF9E9E9E</SolidColorBrush>
                            </Setter.Value>
                        </Setter>
                        <Trigger.Value>
                            <s:Boolean>False</s:Boolean>
                        </Trigger.Value>
                    </Trigger>
                    <DataTrigger Binding="{Binding Path=(SystemParameters.HighContrast)}" Value="True">
                        <Setter Property="TextElement.Foreground" TargetName="OuterBorder">
                            <Setter.Value>
                                <DynamicResource ResourceKey="{x:Static SystemColors.MenuTextBrushKey}" />
                            </Setter.Value>
                        </Setter>
                        <Setter Property="Panel.Background" TargetName="OuterBorder">
                            <Setter.Value>
                                <SolidColorBrush>#00FFFFFF</SolidColorBrush>
                            </Setter.Value>
                        </Setter>
                        <Setter Property="Border.BorderBrush" TargetName="OuterBorder">
                            <Setter.Value>
                                <SolidColorBrush>#00FFFFFF</SolidColorBrush>
                            </Setter.Value>
                        </Setter>
                        <Setter Property="Border.CornerRadius" TargetName="OuterBorder">
                            <Setter.Value>
                                <CornerRadius>0,0,0,0</CornerRadius>
                            </Setter.Value>
                        </Setter>
                    </DataTrigger>
                    <MultiDataTrigger>
                        <MultiDataTrigger.Conditions>
                            <Condition Binding="{Binding Path=IsMouseOver, RelativeSource={RelativeSource Mode=TemplatedParent}}" Value="True" />
                            <Condition Binding="{Binding Path=(SystemParameters.HighContrast)}" Value="True" />
                        </MultiDataTrigger.Conditions>
                        <Setter Property="Border.BorderBrush" TargetName="OuterBorder">
                            <Setter.Value>
                                <DynamicResource ResourceKey="{x:Static SystemColors.ControlLightBrushKey}" />
                            </Setter.Value>
                        </Setter>
                    </MultiDataTrigger>
                    <MultiDataTrigger>
                        <MultiDataTrigger.Conditions>
                            <Condition Binding="{Binding Path=IsMouseOver, RelativeSource={RelativeSource Mode=TemplatedParent}}" Value="True" />
                            <Condition Binding="{Binding Path=IsEnabled, RelativeSource={RelativeSource Mode=Self}}" Value="False" />
                            <Condition Binding="{Binding Path=(SystemParameters.HighContrast)}" Value="True" />
                        </MultiDataTrigger.Conditions>
                        <Setter Property="Border.BorderBrush" TargetName="OuterBorder">
                            <Setter.Value>
                                <DynamicResource ResourceKey="{x:Static SystemColors.GrayTextBrushKey}" />
                            </Setter.Value>
                        </Setter>
                    </MultiDataTrigger>
                    <MultiDataTrigger>
                        <MultiDataTrigger.Conditions>
                            <Condition Binding="{Binding Path=IsDropDownOpen, RelativeSource={RelativeSource Mode=TemplatedParent}, FallbackValue=false}" Value="True" />
                            <Condition Binding="{Binding Path=IsEnabled, RelativeSource={RelativeSource Mode=Self}}" Value="False" />
                            <Condition Binding="{Binding Path=(SystemParameters.HighContrast)}" Value="True" />
                        </MultiDataTrigger.Conditions>
                        <Setter Property="Border.BorderBrush" TargetName="OuterBorder">
                            <Setter.Value>
                                <DynamicResource ResourceKey="{x:Static SystemColors.ControlLightBrushKey}" />
                            </Setter.Value>
                        </Setter>
                    </MultiDataTrigger>
                    <MultiDataTrigger>
                        <MultiDataTrigger.Conditions>
                            <Condition Binding="{Binding Path=IsMouseOver, RelativeSource={RelativeSource Mode=Self}}" Value="True" />
                            <Condition Binding="{Binding Path=(SystemParameters.HighContrast)}" Value="True" />
                        </MultiDataTrigger.Conditions>
                        <Setter Property="Panel.Background" TargetName="OuterBorder">
                            <Setter.Value>
                                <DynamicResource ResourceKey="{x:Static SystemColors.HighlightBrushKey}" />
                            </Setter.Value>
                        </Setter>
                        <Setter Property="Border.BorderBrush" TargetName="OuterBorder">
                            <Setter.Value>
                                <DynamicResource ResourceKey="{x:Static SystemColors.ControlLightBrushKey}" />
                            </Setter.Value>
                        </Setter>
                        <Setter Property="Border.CornerRadius" TargetName="OuterBorder">
                            <Setter.Value>
                                <CornerRadius>0,0,0,0</CornerRadius>
                            </Setter.Value>
                        </Setter>
                        <Setter Property="Border.BorderBrush" TargetName="InnerBorder">
                            <Setter.Value>
                                <SolidColorBrush>#00FFFFFF</SolidColorBrush>
                            </Setter.Value>
                        </Setter>
                        <Setter Property="TextElement.Foreground" TargetName="OuterBorder">
                            <Setter.Value>
                                <DynamicResource ResourceKey="{x:Static SystemColors.HighlightTextBrushKey}" />
                            </Setter.Value>
                        </Setter>
                    </MultiDataTrigger>
                    <MultiDataTrigger>
                        <MultiDataTrigger.Conditions>
                            <Condition Binding="{Binding Path=IsKeyboardFocused, RelativeSource={RelativeSource Mode=Self}}" Value="True" />
                            <Condition Binding="{Binding Path=(SystemParameters.HighContrast)}" Value="True" />
                        </MultiDataTrigger.Conditions>
                        <Setter Property="Panel.Background" TargetName="OuterBorder">
                            <Setter.Value>
                                <DynamicResource ResourceKey="{x:Static SystemColors.HighlightBrushKey}" />
                            </Setter.Value>
                        </Setter>
                        <Setter Property="Border.BorderBrush" TargetName="OuterBorder">
                            <Setter.Value>
                                <DynamicResource ResourceKey="{x:Static SystemColors.ControlLightBrushKey}" />
                            </Setter.Value>
                        </Setter>
                        <Setter Property="Border.CornerRadius" TargetName="OuterBorder">
                            <Setter.Value>
                                <CornerRadius>0,0,0,0</CornerRadius>
                            </Setter.Value>
                        </Setter>
                        <Setter Property="Border.BorderBrush" TargetName="InnerBorder">
                            <Setter.Value>
                                <SolidColorBrush>#00FFFFFF</SolidColorBrush>
                            </Setter.Value>
                        </Setter>
                        <Setter Property="TextElement.Foreground" TargetName="OuterBorder">
                            <Setter.Value>
                                <DynamicResource ResourceKey="{x:Static SystemColors.HighlightTextBrushKey}" />
                            </Setter.Value>
                        </Setter>
                    </MultiDataTrigger>
                    <MultiDataTrigger>
                        <MultiDataTrigger.Conditions>
                            <Condition Binding="{Binding Path=IsPressed, RelativeSource={RelativeSource Mode=Self}}" Value="True" />
                            <Condition Binding="{Binding Path=(SystemParameters.HighContrast)}" Value="True" />
                        </MultiDataTrigger.Conditions>
                        <Setter Property="Panel.Background" TargetName="OuterBorder">
                            <Setter.Value>
                                <DynamicResource ResourceKey="{x:Static SystemColors.HighlightBrushKey}" />
                            </Setter.Value>
                        </Setter>
                        <Setter Property="Border.BorderBrush" TargetName="OuterBorder">
                            <Setter.Value>
                                <DynamicResource ResourceKey="{x:Static SystemColors.ControlDarkBrushKey}" />
                            </Setter.Value>
                        </Setter>
                        <Setter Property="Border.CornerRadius" TargetName="OuterBorder">
                            <Setter.Value>
                                <CornerRadius>0,0,0,0</CornerRadius>
                            </Setter.Value>
                        </Setter>
                        <Setter Property="TextElement.Foreground" TargetName="OuterBorder">
                            <Setter.Value>
                                <DynamicResource ResourceKey="{x:Static SystemColors.HighlightTextBrushKey}" />
                            </Setter.Value>
                        </Setter>
                    </MultiDataTrigger>
                    <MultiDataTrigger>
                        <MultiDataTrigger.Conditions>
                            <Condition Binding="{Binding Path=IsInControlGroup, RelativeSource={RelativeSource Mode=Self}}" Value="True" />
                            <Condition Binding="{Binding Path=(SystemParameters.HighContrast)}" Value="True" />
                        </MultiDataTrigger.Conditions>
                        <Setter Property="Border.BorderBrush" TargetName="OuterBorder">
                            <Setter.Value>
                                <DynamicResource ResourceKey="{x:Static SystemColors.ControlLightLightBrushKey}" />
                            </Setter.Value>
                        </Setter>
                    </MultiDataTrigger>
                    <MultiDataTrigger>
                        <MultiDataTrigger.Conditions>
                            <Condition Binding="{Binding Path=IsEnabled, RelativeSource={RelativeSource Mode=Self}}" Value="False" />
                            <Condition Binding="{Binding Path=(SystemParameters.HighContrast)}" Value="True" />
                        </MultiDataTrigger.Conditions>
                        <Setter Property="TextElement.Foreground" TargetName="OuterBorder">
                            <Setter.Value>
                                <DynamicResource ResourceKey="{x:Static SystemColors.GrayTextBrushKey}" />
                            </Setter.Value>
                        </Setter>
                    </MultiDataTrigger>
                </ControlTemplate.Triggers>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

Answer 2

尝试使用vector graphics。有很多工具可以用来生成相当于这种图像的yaml，你可以看看这个article它可能会有所帮助。

Answer 3

您使用的是哪种操作系统？ - WPF在XP上看起来不太好（不是Vista和7的问题）。我认为这是由于XP和新操作系统之间抗锯齿的默认设置不同。

将XAML中的宽度和高度设置为48以匹配图像大小（同时检查拉伸参数）。

对于48x48 32位PNG，图像应该看起来很好。

由于色带条没有拉伸，矢量图形是多余的。

如果上述方法无效，请尝试设置align to device pixels并设置LayoutRounding。

正如我在评论中建议的那样，您可以将图像调整为显示尺寸，但是，应该在XAML中明确设置，以确保它们是相同的。

您还可以通过将高度或宽度设置为32并使用ScaleTransform来让WPF重新调整图像大小。

Answer 4

我遇到了同样的问题，我创建了自己的usercontrol来解决这个问题。

我就这样做了：

<ribbon:Ribbon>
        <ribbon:RibbonTab Header="File">
            <ribbon:RibbonGroup Header="File">
                <views:ImageButton Command="{Binding LoadCommand}" Caption="Open" SourceImage="/Images/save.png"/>
            </ribbon:RibbonGroup>
        </ribbon:RibbonTab>
    </ribbon:Ribbon>

图像按钮usercontrol ImageButton.xaml

<UserControl Name="control"

 <Button Command="{Binding Command, ElementName=control}" Style="{x:Null}">
    <StackPanel>
        <infrastructure:AutoGreyableImage Width="32" Source="{Binding SourceImage, ElementName=control}"/>
        <TextBlock Text="{Binding Caption, ElementName=control}"/>
    </StackPanel>
</Button>

图像按钮usercontrol ImageButton.xaml.cs

public partial class ImageButton : UserControl
{
    public static DependencyProperty CommandProperty = DependencyProperty.Register(
      "Command", typeof(ICommand), typeof(ImageButton));
    public static DependencyProperty SourceProperty = DependencyProperty.Register(
      "SourceImage", typeof(string), typeof(ImageButton));
    public static DependencyProperty CaptionProperty = DependencyProperty.Register(
      "Caption", typeof(string), typeof(ImageButton));

    public ICommand Command
    {
        get
        {
            return (ICommand)GetValue(CommandProperty);
        }
        set
        {
            SetValue(CommandProperty, value);
        }

    }
    public string SourceImage
    {
        get
        {
            return (string)GetValue(SourceProperty);
        }
        set
        {
            SetValue(SourceProperty, value);
        }

    }
    public string Caption
    {
        get
        {
            return (string)GetValue(CaptionProperty);
        }
        set
        {
            SetValue(CaptionProperty, value);
        }

    }
    public ImageButton()
    {
        InitializeComponent();
    }
}

对于AutogreyableImage，我使用了this post

这是类

的复制粘贴

    using System.Windows.Controls;
    using System.Windows.Media;
    using System.Windows.Media.Imaging;  


/// <summary>
    /// Class used to have an image that is able to be gray when the control is not enabled.
    /// Author: Thomas LEBRUN (http://blogs.developpeur.org/tom)
    /// </summary>
    public class AutoGreyableImage : Image
    {

        /// <summary>
        /// Initializes a new instance of the <see cref="AutoGreyableImage"/> class.
        /// </summary>
        static AutoGreyableImage()
        {
            // Override the metadata of the IsEnabled property.
            IsEnabledProperty.OverrideMetadata(typeof(AutoGreyableImage), new FrameworkPropertyMetadata(true, new PropertyChangedCallback(OnAutoGreyScaleImageIsEnabledPropertyChanged)));
        }

        /// <summary>
        /// Called when [auto grey scale image is enabled property changed].
        /// </summary>
        /// <param name="source">The source.</param>
        /// <param name="args">The <see cref="System.Windows.DependencyPropertyChangedEventArgs"/> instance containing the event data.</param>
        private static void OnAutoGreyScaleImageIsEnabledPropertyChanged(DependencyObject source, DependencyPropertyChangedEventArgs args)
        {
            var autoGreyScaleImg = source as AutoGreyableImage;
            var isEnable = Convert.ToBoolean(args.NewValue);
            if (autoGreyScaleImg != null)
            {
                if (!isEnable)
                {
                    // Get the source bitmap
                    var bitmapImage = new BitmapImage(new Uri(autoGreyScaleImg.Source.ToString()));
                    // Convert it to Gray
                    autoGreyScaleImg.Source = new FormatConvertedBitmap(bitmapImage, PixelFormats.Gray32Float, null, 0);
                    // Create Opacity Mask for greyscale image as FormatConvertedBitmap does not keep transparency info
                    autoGreyScaleImg.OpacityMask = new ImageBrush(bitmapImage);
                }
                else
                {
                    // Set the Source property to the original value.
                    autoGreyScaleImg.Source = ((FormatConvertedBitmap)autoGreyScaleImg.Source).Source;
                    // Reset the Opcity Mask
                    autoGreyScaleImg.OpacityMask = null;
                }
            }
        }
    }

我希望这会帮助你和其他人来

Imagescaling在功能区看起来很糟糕

4 个答案: