community/Ink Canvas/Windows/ScreenshotSelectorWindow.xaml

<Window x:Class="Ink_Canvas.ScreenshotSelectorWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="选择截图区域" 
        WindowStyle="None" 
        AllowsTransparency="True" 
        Background="Transparent"
        WindowState="Maximized"
        Topmost="True"
        ShowInTaskbar="False"
        Cursor="Cross"
        KeyDown="Window_KeyDown"
        MouseLeftButtonDown="Window_MouseLeftButtonDown"
        MouseMove="Window_MouseMove"
        MouseLeftButtonUp="Window_MouseLeftButtonUp">
    
    <Grid Name="MainGrid">
        <!-- 半透明遮罩 -->
        <Rectangle Name="OverlayRectangle"
                   Fill="Black"
                   Opacity="0.3" />

        <!-- 透明选择区域遮罩 - 使用正确的几何体操作 -->
        <Rectangle Name="TransparentSelectionMask"
                   Fill="Black"
                   Opacity="0.3"
                   Visibility="Collapsed">
            <Rectangle.Clip>
                <CombinedGeometry GeometryCombineMode="Exclude">
                    <CombinedGeometry.Geometry1>
                        <RectangleGeometry Rect="0,0,10000,10000" />
                    </CombinedGeometry.Geometry1>
                    <CombinedGeometry.Geometry2>
                        <RectangleGeometry x:Name="SelectionClipGeometry" Rect="0,0,0,0" />
                    </CombinedGeometry.Geometry2>
                </CombinedGeometry>
            </Rectangle.Clip>
        </Rectangle>

        <!-- 选择区域容器 -->
        <Canvas Name="SelectionCanvas" Panel.ZIndex="1000">
            <!-- 矩形选择模式 -->
            <Rectangle Name="SelectionRectangle"
                       Stroke="White"
                       StrokeThickness="1"
                       Fill="#01000000"
                       Visibility="Collapsed"
                       Panel.ZIndex="1001"
                       MouseLeftButtonDown="SelectionRectangle_MouseLeftButtonDown"
                       MouseLeftButtonUp="SelectionRectangle_MouseLeftButtonUp"
                       MouseMove="SelectionRectangle_MouseMove"
                       Cursor="SizeAll" />

            <!-- 任意形状选择模式 -->
            <Path Name="SelectionPath"
                  Stroke="White"
                  StrokeThickness="1"
                  Fill="Transparent"
                  Visibility="Collapsed" />

            <!-- 控制点容器 -->
            <Canvas Name="ControlPointsCanvas" Visibility="Collapsed" Panel.ZIndex="1002">
                <!-- 四个角控制点 -->
                <Ellipse Name="TopLeftControl" Width="8" Height="8" Fill="White" Stroke="White" StrokeThickness="1" Cursor="SizeNWSE" />
                <Ellipse Name="TopRightControl" Width="8" Height="8" Fill="White" Stroke="White" StrokeThickness="1" Cursor="SizeNESW" />
                <Ellipse Name="BottomLeftControl" Width="8" Height="8" Fill="White" Stroke="White" StrokeThickness="1" Cursor="SizeNESW" />
                <Ellipse Name="BottomRightControl" Width="8" Height="8" Fill="White" Stroke="White" StrokeThickness="1" Cursor="SizeNWSE" />
                
                <!-- 四个边控制点 -->
                <Ellipse Name="TopControl" Width="8" Height="8" Fill="White" Stroke="White" StrokeThickness="1" Cursor="SizeNS" />
                <Ellipse Name="BottomControl" Width="8" Height="8" Fill="White" Stroke="White" StrokeThickness="1" Cursor="SizeNS" />
                <Ellipse Name="LeftControl" Width="8" Height="8" Fill="White" Stroke="White" StrokeThickness="1" Cursor="SizeWE" />
                <Ellipse Name="RightControl" Width="8" Height="8" Fill="White" Stroke="White" StrokeThickness="1" Cursor="SizeWE" />
            </Canvas>

            <!-- 尺寸信息显示 -->
            <Border Name="SizeInfoBorder"
                    Background="#1a1a1a"
                    Opacity="0.9"
                    CornerRadius="4"
                    Padding="8,4"
                    Visibility="Collapsed">
                <TextBlock Name="SizeInfoText"
                           Foreground="White"
                           FontSize="12"
                           FontWeight="Medium"
                           Text="0 x 0" />
            </Border>
        </Canvas>

        <!-- 底部工具栏 -->
        <Border Background="#1a1a1a" 
                Opacity="0.95"
                CornerRadius="8"
                Padding="12,8"
                HorizontalAlignment="Center"
                VerticalAlignment="Bottom"
                Margin="0,0,0,80"
                Panel.ZIndex="1000">
            <StackPanel Orientation="Horizontal">
                <!-- 模式切换按钮 -->
                <Button Name="RectangleModeButton" 
                        Content="矩形模式" 
                        Margin="4,0"
                        Padding="12,6"
                        Background="#2563eb"
                        Foreground="White"
                        BorderThickness="0"
                        FontWeight="Medium"
                        Click="RectangleModeButton_Click" />
                <Button Name="FreehandModeButton" 
                        Content="自由绘制" 
                        Margin="4,0"
                        Padding="12,6"
                        Background="#6b7280"
                        Foreground="White"
                        BorderThickness="0"
                        FontWeight="Medium"
                        Click="FreehandModeButton_Click" />
                
                <!-- 分隔线 -->
                <Separator Style="{StaticResource {x:Static ToolBar.SeparatorStyleKey}}" 
                          Margin="8,0" 
                          Background="#404040" />
                
                <!-- 操作按钮 -->
                <Button Name="ConfirmButton"
                        Content="确认截图"
                        Margin="4,0"
                        Padding="12,6"
                        Background="#059669"
                        Foreground="White"
                        BorderThickness="0"
                        FontWeight="Medium"
                        Click="ConfirmButton_Click" />
                <Button Name="CancelButton"
                        Content="取消"
                        Margin="4,0"
                        Padding="12,6"
                        Background="#dc2626"
                        Foreground="White"
                        BorderThickness="0"
                        FontWeight="Medium"
                        Click="CancelButton_Click" />
            </StackPanel>
        </Border>

        <!-- 提示文字 -->
        <Border Background="#1a1a1a"
                Opacity="0.9"
                CornerRadius="6"
                Padding="16,10"
                HorizontalAlignment="Center"
                VerticalAlignment="Top"
                Margin="0,80,0,0"
                Panel.ZIndex="1000">
            <TextBlock Name="HintText"
                       Text="拖拽鼠标选择矩形区域，或使用自由绘制模式"
                       Foreground="White"
                       FontSize="14"
                       FontWeight="Medium" />
        </Border>

        <!-- 调整模式提示 -->
        <Border Name="AdjustModeHint"
                Background="#1a1a1a"
                Opacity="0.9"
                CornerRadius="6"
                Padding="16,10"
                HorizontalAlignment="Center"
                VerticalAlignment="Bottom"
                Margin="0,0,0,140"
                Visibility="Collapsed"
                Panel.ZIndex="1000">
            <TextBlock Text="拖拽控制点调整选择区域，或拖拽边框移动位置"
                       Foreground="White"
                       FontSize="14"
                       FontWeight="Medium" />
        </Border>
    </Grid>
</Window>