WPF 定制 window 圆角

Question

我的自定义 window 的 xaml 样式有问题。该样式将 window 的边缘设置为圆形，并查看它是否停靠到边缘。 但在更改 window 的大小后它不再起作用。在启动时所有边缘都是圆形的，当我将它捕捉到屏幕的右侧或左侧时它显示角不圆。 但是如果我调整 window 的大小，它会在整个运行时完全禁用圆角。

我如何更改我的 xaml 代码以获得在 window 样式中不显示圆角的行为，但如果我调整 window 的大小？

以下代码是我的样式代码。 您可以将其设置为 window 并根据需要调整 window 的大小，您会看到我的问题吗？

 <Style x:Key="ModernWindowStyle"  TargetType="{x:Type Window}">
        <Setter Property="AllowsTransparency" Value="True"/>
        <Setter Property="Background" Value="Transparent"/>
        <Setter Property="ResizeMode" Value="CanResize"/>
        <Setter Property="WindowStyle" Value="None"/>
        <Setter Property="MinHeight" Value="300"/>
        <Setter Property="MinWidth" Value="530"/>
        <Setter Property="MaxHeight" Value="{x:Static SystemParameters.MaximizedPrimaryScreenHeight}"/>
        <Setter Property="MaxWidth" Value="{x:Static SystemParameters.MaximizedPrimaryScreenWidth}"/>
        <Setter Property="WindowChrome.WindowChrome">
            <Setter.Value>
                <WindowChrome
                   CaptionHeight="50"
                   CornerRadius="8"
                   ResizeBorderThickness="5"/>
            </Setter.Value>
        </Setter>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="Window">
                    <Border BorderThickness="1"
                            BorderBrush="#FFD9D9D9">
                        <Border.Resources>
                            <core:MultiValueEqualityConverter x:Key="multiValueEqualityConverter" />
                        </Border.Resources>
                        <Grid>
                            <Grid.RowDefinitions>
                                <RowDefinition Height="Auto" />
                                <RowDefinition />
                            </Grid.RowDefinitions>
                           


                            <ContentPresenter Grid.Row="1" />
                        </Grid>
                        <Border.Style>
                            <Style TargetType="Border">
                                <Setter Property="CornerRadius"
                                        Value="8" />
                                <Setter Property="Background" >
                                    <Setter.Value>
                                        <LinearGradientBrush EndPoint="0,0" StartPoint="0,1">
                                            <GradientStop Color="#FF99BDCE" />
                                            <GradientStop Color="White" Offset="0.7"/>
                                        </LinearGradientBrush>
                                    </Setter.Value>
                                </Setter>
                                <Style.Triggers>

                                    <MultiDataTrigger>
                                        <MultiDataTrigger.Conditions>
                                            <Condition Value="False">
                                                <Condition.Binding>
                                                    <MultiBinding Delay="1000" Converter="{StaticResource multiValueEqualityConverter}" ConverterParameter="HI">
                                                        <Binding RelativeSource="{RelativeSource TemplatedParent}"
                                                                 Path="Width"
                                                                 Mode="OneWay" />
                                                        <Binding RelativeSource="{RelativeSource TemplatedParent}"
                                                                 Path="RestoreBounds.Width"
                                                                 Mode="OneWay" />
                                                    </MultiBinding>
                                                </Condition.Binding>
                                            </Condition>
                                            <Condition Value="False">
                                                <Condition.Binding>
                                                    <MultiBinding  Delay="1000"
                                                                   Converter="{StaticResource multiValueEqualityConverter}">
                                                        <Binding RelativeSource="{RelativeSource TemplatedParent}"
                                                                 Path="Height"
                                                                 Mode="OneWay" />
                                                        <Binding RelativeSource="{RelativeSource TemplatedParent}"
                                                                 Path="RestoreBounds.Height"
                                                                 Mode="OneWay" />
                                                    </MultiBinding>
                                                </Condition.Binding>
                                            </Condition>
                                            <Condition  Binding="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=WindowState}"
                                                       Value="Normal" />
                                        </MultiDataTrigger.Conditions>
                                        <Setter Property="CornerRadius"
                                                Value="0" />
                                    </MultiDataTrigger>
                                </Style.Triggers>
                            </Style>
                        </Border.Style>
                    </Border>
                </ControlTemplate>
            </Setter.Value>

        </Setter>
    </Style>

和 MultiValueEqualityConverter

  public class MultiValueEqualityConverter : IMultiValueConverter
    {
        public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
        {
            return values?.All(o => o?.Equals(values[0]) == true) == true || values?.All(o => o == null) == true;
        }

        public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }

Answer 1

我认为问题是RestoreBounds.Height或RestoreBounds.Width不通知值已更改，但Height或Width通知。

所以MultiBinding “认为” RestoreBounds没有改变并且确实使用旧值，结果为false 。

要修复它，只需将 window 传递给转换器并检查那里的RestoreBounds 。

<Style.Triggers>
    <MultiDataTrigger>
        <MultiDataTrigger.Conditions>
            <Condition Value="False">
                <Condition.Binding>
                    <MultiBinding  Delay="1000" Converter="{StaticResource multiValueEqualityConverter}">
                        <Binding RelativeSource="{RelativeSource TemplatedParent}"
                                Path="Height"
                                Mode="OneWay" />
                        <Binding RelativeSource="{RelativeSource TemplatedParent}" Mode="OneWay" />
                    </MultiBinding>
                </Condition.Binding>
            </Condition>
            <Condition Value="False">
                <Condition.Binding>
                    <MultiBinding Delay="1000" Converter="{StaticResource multiValueEqualityConverter}" ConverterParameter="HI">
                        <Binding RelativeSource="{RelativeSource TemplatedParent}"
                                Path="Width"
                                Mode="OneWay" />
                        <Binding RelativeSource="{RelativeSource TemplatedParent}" Mode="OneWay" />
                    </MultiBinding>
                </Condition.Binding>
            </Condition>
            <Condition  Binding="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=WindowState}"
                    Value="Normal" />
        </MultiDataTrigger.Conditions>
        <Setter Property="CornerRadius"
            Value="0" />
    </MultiDataTrigger>
</Style.Triggers>

public class MultiValueEqualityConverter : IMultiValueConverter
{
    public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
    {
        if (values[1] is System.Windows.Window wnd)
        {
            return wnd.Height == wnd.RestoreBounds.Height && wnd.Width == wnd.RestoreBounds.Width;
        }
        return false;
    }

    public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}