好久没撸随笔了，明天终于放假休息了。。准备去进行信仰充值，看《魔兽》去（话说surface phone 好久出，让我这个做UWP的也充点信仰。。）
先上下效果图：
在设计中，遇到一个问题，就是如果添加了剪切蒙版之后会挡住后面的ScrollViewer里面的Image，一些事件将无法监听。
后面想了个办法，把ScrollViewer的模板给修改了。
开源有益，先上代码
下面是Theme
<Style x:Key="ImageToolScrollViewerStyle" TargetType="ScrollViewer">
<Setter Property="HorizontalScrollMode" Value="Enabled"/>
<Setter Property="VerticalScrollMode" Value="Enabled"/>
<!--<Setter Property="IsHorizontalRailEnabled" Value="False"/>
<Setter Property="IsVerticalRailEnabled" Value="False"/>-->
<Setter Property="IsTabStop" Value="False"/>
<Setter Property="ZoomMode" Value="Enabled"/>
<Setter Property="HorizontalAlignment" Value="Stretch"/>
<Setter Property="VerticalAlignment" Value="Stretch"/>
<Setter Property="HorizontalContentAlignment" Value="Stretch"/>
<Setter Property="VerticalContentAlignment" Value="Stretch"/>
<Setter Property="VerticalScrollBarVisibility" Value="Hidden"/>
<Setter Property="HorizontalScrollBarVisibility" Value="Hidden"/>
<Setter Property="Padding" Value=""/>
<Setter Property="BorderThickness" Value=""/>
<Setter Property="BorderBrush" Value="Transparent"/>
<Setter Property="Background" Value="Transparent"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ScrollViewer">
<Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}">
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="ScrollingIndicatorStates">
<VisualStateGroup.Transitions>
<VisualTransition From="MouseIndicator" To="NoIndicator">
<Storyboard>
<FadeOutThemeAnimation BeginTime="0:0:3" TargetName="ScrollBarSeparator"/>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="IndicatorMode" Storyboard.TargetName="VerticalScrollBar">
<DiscreteObjectKeyFrame KeyTime="0:0:3">
<DiscreteObjectKeyFrame.Value>
<ScrollingIndicatorMode>None</ScrollingIndicatorMode>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="IndicatorMode" Storyboard.TargetName="HorizontalScrollBar">
<DiscreteObjectKeyFrame KeyTime="0:0:3">
<DiscreteObjectKeyFrame.Value>
<ScrollingIndicatorMode>None</ScrollingIndicatorMode>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualTransition>
<VisualTransition From="TouchIndicator" To="NoIndicator">
<Storyboard>
<FadeOutThemeAnimation TargetName="ScrollBarSeparator"/>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="IndicatorMode" Storyboard.TargetName="VerticalScrollBar">
<DiscreteObjectKeyFrame KeyTime="0:0:0.5">
<DiscreteObjectKeyFrame.Value>
<ScrollingIndicatorMode>None</ScrollingIndicatorMode>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="IndicatorMode" Storyboard.TargetName="HorizontalScrollBar">
<DiscreteObjectKeyFrame KeyTime="0:0:0.5">
<DiscreteObjectKeyFrame.Value>
<ScrollingIndicatorMode>None</ScrollingIndicatorMode>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualTransition>
</VisualStateGroup.Transitions>
<VisualState x:Name="NoIndicator">
<Storyboard>
<FadeOutThemeAnimation TargetName="ScrollBarSeparator"/>
</Storyboard>
</VisualState>
<VisualState x:Name="TouchIndicator">
<Storyboard>
<FadeOutThemeAnimation TargetName="ScrollBarSeparator"/>
<ObjectAnimationUsingKeyFrames Duration="" Storyboard.TargetProperty="IndicatorMode" Storyboard.TargetName="VerticalScrollBar">
<DiscreteObjectKeyFrame KeyTime="">
<DiscreteObjectKeyFrame.Value>
<ScrollingIndicatorMode>TouchIndicator</ScrollingIndicatorMode>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Duration="" Storyboard.TargetProperty="IndicatorMode" Storyboard.TargetName="HorizontalScrollBar">
<DiscreteObjectKeyFrame KeyTime="">
<DiscreteObjectKeyFrame.Value>
<ScrollingIndicatorMode>TouchIndicator</ScrollingIndicatorMode>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="MouseIndicator">
<Storyboard>
<FadeInThemeAnimation TargetName="ScrollBarSeparator"/>
<ObjectAnimationUsingKeyFrames Duration="" Storyboard.TargetProperty="IndicatorMode" Storyboard.TargetName="VerticalScrollBar">
<DiscreteObjectKeyFrame KeyTime="">
<DiscreteObjectKeyFrame.Value>
<ScrollingIndicatorMode>MouseIndicator</ScrollingIndicatorMode>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Duration="" Storyboard.TargetProperty="IndicatorMode" Storyboard.TargetName="HorizontalScrollBar">
<DiscreteObjectKeyFrame KeyTime="">
<DiscreteObjectKeyFrame.Value>
<ScrollingIndicatorMode>MouseIndicator</ScrollingIndicatorMode>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Grid Background="{TemplateBinding Background}">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<ScrollContentPresenter x:Name="ScrollContentPresenter" Grid.ColumnSpan="" ContentTemplate="{TemplateBinding ContentTemplate}" Margin="{TemplateBinding Padding}" Grid.RowSpan=""/>
<ScrollBar x:Name="VerticalScrollBar" Grid.Column="" HorizontalAlignment="Right" IsTabStop="False" Maximum="{TemplateBinding ScrollableHeight}" Orientation="Vertical" Visibility="{TemplateBinding ComputedVerticalScrollBarVisibility}" Value="{TemplateBinding VerticalOffset}" ViewportSize="{TemplateBinding ViewportHeight}"/>
<ScrollBar x:Name="HorizontalScrollBar" IsTabStop="False" Maximum="{TemplateBinding ScrollableWidth}" Orientation="Horizontal" Grid.Row="" Visibility="{TemplateBinding ComputedHorizontalScrollBarVisibility}" Value="{TemplateBinding HorizontalOffset}" ViewportSize="{TemplateBinding ViewportWidth}"/>
<Border x:Name="ScrollBarSeparator" Background="{ThemeResource SystemControlPageBackgroundChromeLowBrush}" Grid.Column="" Grid.Row=""/>
<Canvas x:Name="CropSelectionCanvas" Grid.ColumnSpan="" Visibility="{Binding CropSelectionVisibility}">
<Path x:Name="nonselectRegion" Fill="#88FFFFFF" >
<Path.Data>
<GeometryGroup>
<RectangleGeometry Rect="{Binding OuterRect}">
</RectangleGeometry>
<RectangleGeometry Rect="{Binding SelectedRect}">
</RectangleGeometry>
</GeometryGroup>
</Path.Data>
</Path>
<Path x:Name="selectRegion" Fill="Transparent" Stroke="{ThemeResource ApplicationForegroundThemeBrush}" StrokeThickness="">
<Path.Data>
<RectangleGeometry Rect="{Binding SelectedRect}"/>
</Path.Data>
</Path>
<Rectangle x:Name="horizontalLine" Canvas.Left="{Binding SelectedRect.Left}" Canvas.Top="{Binding HorizontalLineCanvasTop}" Height="" Width="{Binding SelectedRect.Width}" Fill="{ThemeResource ApplicationForegroundThemeBrush}"/>
<Rectangle x:Name="verticalLine" Canvas.Left="{Binding VerticalLineCanvasLeft}" Canvas.Top="{Binding SelectedRect.Top}" Width="" Height="{Binding SelectedRect.Height}" Fill="{ThemeResource ApplicationForegroundThemeBrush}"/>
<Rectangle x:Name="horizontalLine1" Canvas.Left="{Binding SelectedRect.Left}" Canvas.Top="{Binding HorizontalLine1CanvasTop}" Height="" Width="{Binding SelectedRect.Width}" Fill="{ThemeResource ApplicationForegroundThemeBrush}"/>
<Rectangle x:Name="verticalLine1" Canvas.Left="{Binding VerticalLine1CanvasLeft}" Canvas.Top="{Binding SelectedRect.Top}" Width="" Height="{Binding SelectedRect.Height}" Fill="{ThemeResource ApplicationForegroundThemeBrush}"/>
</Canvas>
</Grid>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style> <Style TargetType="local:ImageTool">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="local:ImageTool">
<Grid >
<Grid.Resources>
<Style TargetType="Ellipse">
<Setter Property="Height" Value=""/>
<Setter Property="Width" Value=""/>
<Setter Property="Fill" Value="{ThemeResource ApplicationPageBackgroundThemeBrush}"/>
<Setter Property="Stroke" Value="{ThemeResource ApplicationForegroundThemeBrush}"/>
<Setter Property="StrokeThickness" Value=""/>
<Setter Property="RenderTransform">
<Setter.Value>
<CompositeTransform TranslateX="-15" TranslateY="-15" />
</Setter.Value>
</Setter>
</Style>
</Grid.Resources>
<Image x:Name="sourceImage" Visibility="Visible" Opacity=""/>
<Canvas x:Name="imageCanvas" HorizontalAlignment="Stretch" IsHitTestVisible="{Binding CropSelectionVisibility,Converter={StaticResource InversedBooleanToVisibilityConverter}}" VerticalAlignment="Stretch">
<ScrollViewer x:Name="scrollViewer" MinZoomFactor="" MaxZoomFactor="" Style="{StaticResource ImageToolScrollViewerStyle}">
<Grid x:Name="imageGrid" >
<Image x:Name="editImage" HorizontalAlignment="Center" VerticalAlignment="Center"/>
</Grid>
</ScrollViewer>
<Ellipse x:Name="topLeftThumb" Visibility="{Binding CropSelectionVisibility}" Canvas.Left="{Binding SelectedRect.Left}" Canvas.Top="{Binding SelectedRect.Top}"/>
<Ellipse x:Name="topRightThumb" Visibility="{Binding CropSelectionVisibility}" Canvas.Left="{Binding SelectedRect.Right}" Canvas.Top="{Binding SelectedRect.Top}"/>
<Ellipse x:Name="bottomLeftThumb" Visibility="{Binding CropSelectionVisibility}" Canvas.Left="{Binding SelectedRect.Left}" Canvas.Top="{Binding SelectedRect.Bottom}"/>
<Ellipse x:Name="bottomRightThumb" Visibility="{Binding CropSelectionVisibility}" Canvas.Left="{Binding SelectedRect.Right}" Canvas.Top="{Binding SelectedRect.Bottom}"/>
</Canvas>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
可以看到我把蒙版加到了ScrollViewer的模板里面。这样就不会阻止一些事件了。
需要的朋友可以在这里下载代码。
有啥问题，或者更好的想法可以跟我讲，大家一起进步。
放假几天有空把另外2个控件也写了。先放图给大家see see。
VirtualizedVariableSizedGridView 主要给平板，PC写的，phone上面跟ListView一样。
DataGrid, Touch模式支持下拉刷新，行列锁定，sort等功能
