ColorPicker
故事背景
项目里面需要一个像Winfrom里面那样的颜色选择器，如下图所示：
在网上看了一下。没有现成的东东可以拿来使用。大概查看了一下关于颜色的一些知识，想着没人种树，那就由我自己来种树，大家来乘凉好了。
设计过程
由于要考虑到手机上的效果，所以说这种向右展开的方式，不是太合适手机，所以最外层我考虑使用Pivot来存放基本颜色和自定义颜色这2页。
第一页是基本颜色，第二页是自定义的颜色，如下图。
ColorPicker这个控件，主要是由一个Button以及FlyoutBase.AttachedFlyout中的Flyout来组成的。
由Button的点击来控制Flyout的打开或者是关闭。
<Button x:Name="ToggleButton" Padding="{TemplateBinding Padding}" BorderBrush="{TemplateBinding BorderBrush}" Background="{TemplateBinding Background}" BorderThickness="{TemplateBinding BorderThickness}"> <Grid Padding="{TemplateBinding Padding}" Background="#01010101"> <Grid.ColumnDefinitions> <ColumnDefinition Width="*"/> <ColumnDefinition Width="auto"/> </Grid.ColumnDefinitions> <Rectangle HorizontalAlignment="Stretch" VerticalAlignment="Stretch"> <Rectangle.Fill> <!--failed to use TemplateBinding--> <SolidColorBrush Color="{Binding SelectedColor,RelativeSource={RelativeSource TemplatedParent}}"/> </Rectangle.Fill> </Rectangle> <TextBlock x:Name="ArrowPolygon" Foreground="{TemplateBinding Foreground}" Visibility="{TemplateBinding ArrowVisibility}" Grid.Column="1" Text="" FontSize="{TemplateBinding FontSize}" FontFamily="Segoe UI Symbol" FontWeight="Normal" VerticalAlignment="Center" HorizontalAlignment="Center" Margin="5,0,5,0"/> </Grid> <FlyoutBase.AttachedFlyout> <Flyout x:Name="Flyout"> <Flyout.FlyoutPresenterStyle> <Style TargetType="FlyoutPresenter"> <Setter Property="ScrollViewer.VerticalScrollMode" Value="Disabled"/> <Setter Property="ScrollViewer.HorizontalScrollMode" Value="Disabled"/> <Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Disabled"/> <Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Disabled"/> <!--<Setter Property="MaxHeight" Value="NaN"/> <Setter Property="MaxWidth" Value="NaN"/>--> <Setter Property="MinHeight" Value="0"/> <Setter Property="MinWidth" Value="0"/> <Setter Property="Padding" Value="0,0,0,0"/> <Setter Property="Margin" Value="0,0,0,0"/> <Setter Property="BorderThickness" Value="0"/> <Setter Property="Background" Value="White"/> <!--<Setter Property="BorderBrush" Value="#A4AFBA"/>--> <Setter Property="MaxWidth" Value="NaN"/> <Setter Property="MaxHeight" Value="NaN"/> <Setter Property="Background" Value="Transparent"/> <Setter Property="VerticalContentAlignment" Value="Center"/> <Setter Property="HorizontalContentAlignment" Value="Center"/> </Style> </Flyout.FlyoutPresenterStyle> <Grid Background="#FFD1DCE8" RequestedTheme="Light" BorderBrush="#A4AFBA" BorderThickness="1" Width="{TemplateBinding FlyoutWidth}" Height="{TemplateBinding FlyoutHeight}"> <Pivot x:Name="Pivot" Style="{StaticResource ColorPickerPivot}"> <Pivot.Resources> <!--<Style TargetType="TextBlock"> <Setter Property="Foreground" Value="Black"/> </Style>--> <Style TargetType="PivotHeaderItem" BasedOn="{StaticResource ColorPickerPivotHeaderItem}"/> <Style TargetType="PivotItem"> <Setter Property="HorizontalContentAlignment" Value="Stretch"/> <Setter Property="Margin" Value="0"/> <Setter Property="Padding" Value="0"/> <Setter Property="MinWidth" Value="0"/> </Style> </Pivot.Resources> <PivotItem> <PivotItem.Header> <Grid HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Padding="5"> <Grid.ColumnDefinitions> <ColumnDefinition Width="17"/> <ColumnDefinition/> </Grid.ColumnDefinitions> <Border Width="13" Height="13" Background="#FF97AEBF"> <Grid> <Rectangle Height="10" HorizontalAlignment="Left" VerticalAlignment="Top" Width="3" Fill="#FFFF0000" Margin="1 1 0 0"/> <Rectangle Height="5" HorizontalAlignment="Left" VerticalAlignment="Top" Width="3" Fill="#FFFFC000" Margin="5 1 0 0"/> <Rectangle Height="5" HorizontalAlignment="Left" VerticalAlignment="Top" Width="3" Fill="#FFFFFF00" Margin="9 1 0 0"/> <Rectangle Height="5" HorizontalAlignment="Left" VerticalAlignment="Top" Width="3" Fill="#FF92D050" Margin="1 5 0 0"/> <Rectangle Height="5" HorizontalAlignment="Left" VerticalAlignment="Top" Width="3" Fill="#FF00B050" Margin="5 5 0 0"/> <Rectangle Height="5" HorizontalAlignment="Left" VerticalAlignment="Top" Width="3" Fill="#FF0C8242" Margin="9 5 0 0"/> <Rectangle Height="5" HorizontalAlignment="Left" VerticalAlignment="Top" Width="3" Fill="#FF0070C0" Margin="1 9 0 0"/> <Rectangle Height="5" HorizontalAlignment="Left" VerticalAlignment="Top" Width="3" Fill="#FF002060" Margin="5 9 0 0"/> <Rectangle Height="5" HorizontalAlignment="Left" VerticalAlignment="Top" Width="3" Fill="#FF7030A0" Margin="9 9 0 0"/> </Grid> </Border> <TextBlock HorizontalAlignment="Left" VerticalAlignment="Center" Text="基本颜色" TextWrapping="Wrap" Grid.Column="1"> </TextBlock> </Grid> </PivotItem.Header> <StackPanel Orientation="Vertical"> <Border Margin="0,5,0,0" HorizontalAlignment="Stretch" BorderBrush="#A4AFBA" BorderThickness="0,0,0,1" Height="30"> <TextBlock Margin="5,0" VerticalAlignment="Center"> <Run Text="{Binding Title,RelativeSource={RelativeSource TemplatedParent}}"/> <Run Text=" - "/> <Run Text="基本颜色"/> </TextBlock> </Border> <local:ColorPickerItemsControl x:Name="BasicColorItems" MinHeight="43"/> <Border Margin="0,5,0,0" BorderBrush="#A4AFBA" BorderThickness="0,0,0,1" HorizontalAlignment="Stretch" Height="30"> <TextBlock Margin="5,0" Text="最近使用颜色" VerticalAlignment="Center"/> </Border> <local:ColorPickerItemsControl x:Name="RecentColorItems" MinHeight="43"/> </StackPanel> </PivotItem> <PivotItem> <PivotItem.Header> <Grid HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Padding="5"> <Grid.ColumnDefinitions> <ColumnDefinition Width="17"/> <ColumnDefinition/> </Grid.ColumnDefinitions> <Ellipse Height="14" Margin="0.5,-1,3,-1" Fill="#FFFFFFFF" Width="14"/> <Ellipse Width="14" Height="14" Margin="0.5,-1,3,-1"> <Ellipse.Fill> <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0"> <GradientStop Color="#FFFF0000" Offset="0.1"/> <GradientStop Color="#00FF0000" Offset="0.5"/> </LinearGradientBrush> </Ellipse.Fill> </Ellipse> <Ellipse Height="14" HorizontalAlignment="Stretch" Margin="0.5,-1,3,-1" VerticalAlignment="Stretch" Width="14"> <Ellipse.Fill> <LinearGradientBrush EndPoint="0.982999980449677,0.179000005125999" StartPoint="0.0879999995231628,0.753000020980835"> <GradientStop Color="#FF079BF0" Offset="0.1"/> <GradientStop Color="#00079BF0" Offset="0.5"/> </LinearGradientBrush> </Ellipse.Fill> </Ellipse> <Ellipse Height="14" HorizontalAlignment="Stretch" Margin="0.5,-1,3,-1" VerticalAlignment="Stretch" Width="14"> <Ellipse.Fill> <LinearGradientBrush EndPoint="0.136000007390976,0.174999997019768" StartPoint="0.843999981880188,0.822000026702881"> <GradientStop Color="#FFF2F413" Offset="0.1"/> <GradientStop Color="#00F2F413" Offset="0.5"/> </LinearGradientBrush> </Ellipse.Fill> </Ellipse> <Ellipse Height="14" HorizontalAlignment="Stretch" Margin="0.5,-1,3,-1" VerticalAlignment="Stretch" Width="14" Visibility="Visible"> <Ellipse.Fill> <LinearGradientBrush> <GradientStop Color="#00000000" Offset="0.772"/> <GradientStop Color="#4C000000" Offset="1"/> </LinearGradientBrush> </Ellipse.Fill> </Ellipse> <Ellipse Height="15" HorizontalAlignment="Stretch" Margin="-0.5,-1.5,2.5,-1.5" VerticalAlignment="Stretch" Width="15" Stroke="#FF8AA3B5"/> <TextBlock HorizontalAlignment="Left" VerticalAlignment="Center" Text="自定义颜色" TextWrapping="Wrap" Grid.Column="1"> </TextBlock> </Grid> </PivotItem.Header> <Grid HorizontalAlignment="Stretch" VerticalAlignment="Stretch"> <Grid.RowDefinitions> <RowDefinition Height="auto"/> <RowDefinition Height="*"/> <RowDefinition Height="auto"/> <RowDefinition Height="auto"/> </Grid.RowDefinitions> <Grid.Resources> <Style TargetType="local:NumericTextBox"> <Setter Property="InputScope" Value="Number"/> <Setter Property="ValueFormat" Value="F0"/> <Setter Property="Minimum" Value="0"/> <Setter Property="Maximum" Value="255"/> <Setter Property="MinWidth" Value="0"/> <Setter Property="Margin" Value="5,0,0,0"/> <Setter Property="HorizontalContentAlignment" Value="Center"/> </Style> </Grid.Resources> <Border Margin="0,5,0,0" HorizontalAlignment="Stretch" BorderBrush="#A4AFBA" BorderThickness="0,0,0,1" Height="30"> <TextBlock Margin="5,0" VerticalAlignment="Center"> <Run Text="{Binding Title,RelativeSource={RelativeSource TemplatedParent}}"/> <Run Text=" - "/> <Run Text="自定义颜色"/> </TextBlock> </Border> <Grid HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Grid.Row="1" BorderBrush="#A4AFBA" BorderThickness="0,0,0,1"> <Grid.ColumnDefinitions> <ColumnDefinition Width="*"/> <ColumnDefinition Width="auto"/> <ColumnDefinition Width="auto"/> </Grid.ColumnDefinitions> <ContentControl x:Name="ChoiceGridParent" Grid.Column="0" HorizontalContentAlignment="Stretch" VerticalContentAlignment="Stretch"> <Grid x:Name="ChoiceGrid" HorizontalAlignment="Stretch" Margin="5,5,0,5" VerticalAlignment="Stretch" > <!--<Grid.Background> <LinearGradientBrush StartPoint="0,0" EndPoint="1,0"> <LinearGradientBrush.GradientStops> <GradientStop Offset="0.0" Color="White"/> <GradientStop Offset="1" Color="#00FFFFFF"/> </LinearGradientBrush.GradientStops> </LinearGradientBrush> </Grid.Background>--> <Rectangle HorizontalAlignment="Stretch" VerticalAlignment="Stretch"> <Rectangle.Fill> <LinearGradientBrush StartPoint="0,0" EndPoint="1,0"> <LinearGradientBrush.GradientStops> <GradientStop Offset="0.0" Color="White"/> <GradientStop Offset="1" Color="#00FFFFFF"/> </LinearGradientBrush.GradientStops> </LinearGradientBrush> </Rectangle.Fill> </Rectangle> <Rectangle HorizontalAlignment="Stretch" VerticalAlignment="Stretch"> <Rectangle.Fill> <LinearGradientBrush StartPoint="0,0" EndPoint="0,1"> <LinearGradientBrush.GradientStops> <GradientStop Offset="0.0" Color="#00000000"/> <GradientStop Offset="1" Color="Black"/> </LinearGradientBrush.GradientStops> </LinearGradientBrush> </Rectangle.Fill> </Rectangle> <Canvas x:Name="PadCanvas"> <Canvas x:Name="Indicator"> <Ellipse Height="6" Width="6" Fill="Transparent" Stroke="#FFFFFFFF" StrokeThickness="1" Margin="-3 -3 0 0" /> <Ellipse Height="12" Width="12" Fill="Transparent" Stroke="#FF737373" Margin="-6 -6 0 0" /> </Canvas> </Canvas> </Grid> </ContentControl> <Slider x:Name="Hue" Style="{StaticResource ColorPickerHueSlider}" Margin="5,5,0,5" Grid.Column="1"> <Slider.Background> <LinearGradientBrush StartPoint="0,0" EndPoint="0,1"> <GradientStop Offset="0.0" Color="#FFFF0000"/> <GradientStop Offset="0.2" Color="#FFFFFF00"/> <GradientStop Offset="0.4" Color="#FF00FF00"/> <GradientStop Offset="0.6" Color="#FF0000FF"/> <GradientStop Offset="0.8" Color="#FFFF00FF"/> <GradientStop Offset="1.0" Color="#FFFF0000"/> </LinearGradientBrush> </Slider.Background> </Slider> <Slider x:Name="Alpha" Style="{StaticResource ColorPickerAlphaSlider}" Margin="5" Grid.Column="2"> <Slider.Background> <LinearGradientBrush StartPoint="0,0" EndPoint="0,1"> <GradientStop Color="Black" Offset="0"/> <GradientStop Color="Transparent" Offset="1"/> </LinearGradientBrush> </Slider.Background> </Slider> </Grid> <Grid Margin="0,0,5,0" Padding="0,0,0,5" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Grid.Row="2" BorderBrush="#A4AFBA" BorderThickness="0,0,0,1"> <Grid.ColumnDefinitions> <ColumnDefinition Width="*"/> <ColumnDefinition Width="*"/> <ColumnDefinition Width="*"/> <ColumnDefinition Width="*"/> </Grid.ColumnDefinitions> <local:NumericTextBox x:Name="AColor" Grid.Column="0"> <local:NumericTextBox.Header> <TextBlock Text="透明度(A)" HorizontalAlignment="Center"/> </local:NumericTextBox.Header> </local:NumericTextBox> <local:NumericTextBox x:Name="RColor" Grid.Column="1" > <local:NumericTextBox.Header> <TextBlock Text="红(R)" HorizontalAlignment="Center"/> </local:NumericTextBox.Header> </local:NumericTextBox> <local:NumericTextBox x:Name="GColor" Grid.Column="2" > <local:NumericTextBox.Header> <TextBlock Text="绿(G)" HorizontalAlignment="Center"/> </local:NumericTextBox.Header> </local:NumericTextBox> <local:NumericTextBox x:Name="BColor" Grid.Column="3" > <local:NumericTextBox.Header> <TextBlock Text="蓝(B)" HorizontalAlignment="Center"/> </local:NumericTextBox.Header> </local:NumericTextBox> </Grid> <Grid Grid.Row="3" Margin="5"> <Grid.ColumnDefinitions> <ColumnDefinition Width="*"/> <ColumnDefinition Width="auto"/> </Grid.ColumnDefinitions> <Grid HorizontalAlignment="Stretch" Margin="0,0,10,0"> <local:TransparentBackground/> <Rectangle x:Name="CustomColorRectangle" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"> <Rectangle.Fill> <SolidColorBrush Color="{Binding CurrentCustomColor,RelativeSource={RelativeSource TemplatedParent}}"/> </Rectangle.Fill> <ToolTipService.ToolTip> <ToolTip> <Binding Converter="{StaticResource ColorToStringConverter}" Path="CurrentCustomColor" RelativeSource="{RelativeSource TemplatedParent}"/> </ToolTip> </ToolTipService.ToolTip> </Rectangle> </Grid> <Button x:Name="CustomColorOkButton" Grid.Column="1" Content="确定" VerticalAlignment="Center" HorizontalAlignment="Right"/> </Grid> </Grid> </PivotItem> </Pivot> <Button x:Name="CloseButton" Content="关闭" HorizontalAlignment="Right" VerticalAlignment="Bottom" Margin="5"/> </Grid> </Flyout> </FlyoutBase.AttachedFlyout> <ToolTipService.ToolTip> <ToolTip> <Binding Path="SelectedColor" RelativeSource="{RelativeSource TemplatedParent}" Converter="{StaticResource ColorToStringConverter}"/> </ToolTip> </ToolTipService.ToolTip> </Button>
通过重写Pivot的模板我们可以轻松得到PiovtHeaderItem 在下面的效果（修改Header和PivotItemPresenter的行号）
Pivot部分模板代码如下，注意蓝色部分：
<Grid x:Name="PivotLayoutElement"> <Grid.RowDefinitions> <RowDefinition Height="*" /> <RowDefinition Height="Auto" /> </Grid.RowDefinitions> <Grid.ColumnDefinitions> <ColumnDefinition Width="Auto" /> <ColumnDefinition Width="*" /> <ColumnDefinition Width="Auto" /> </Grid.ColumnDefinitions> <Grid.RenderTransform> <CompositeTransform x:Name="PivotLayoutElementTranslateTransform" /> </Grid.RenderTransform> <ContentPresenter Grid.Row="1" x:Name="LeftHeaderPresenter" Content="{TemplateBinding LeftHeader}" ContentTemplate="{TemplateBinding LeftHeaderTemplate}" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" /> <ContentControl Grid.Row="1" x:Name="HeaderClipper" Grid.Column="1" UseSystemFocusVisuals="False" HorizontalContentAlignment="Stretch"> <ContentControl.Clip> <RectangleGeometry x:Name="HeaderClipperGeometry" /> </ContentControl.Clip> <Grid Background="Transparent" BorderBrush="#A4AFBA" BorderThickness="0,1,0,0"> <PivotHeaderPanel x:Name="StaticHeader" Visibility="Collapsed" /> <PivotHeaderPanel x:Name="Header"> <PivotHeaderPanel.RenderTransform> <TransformGroup> <CompositeTransform x:Name="HeaderTranslateTransform" /> <CompositeTransform x:Name="HeaderOffsetTranslateTransform" /> </TransformGroup> </PivotHeaderPanel.RenderTransform> </PivotHeaderPanel> </Grid> </ContentControl> <Button Grid.Row="1" x:Name="PreviousButton" Grid.Column="1" Template="{StaticResource PreviousTemplate}" Width="20" Height="36" UseSystemFocusVisuals="False" Margin="{ThemeResource PivotNavButtonMargin}" IsTabStop="False" IsEnabled="False" HorizontalAlignment="Left" VerticalAlignment="Top" Opacity="0" Background="Transparent" /> <Button Grid.Row="1" x:Name="NextButton" Grid.Column="1" Template="{StaticResource NextTemplate}" Width="20" Height="36" UseSystemFocusVisuals="False" Margin="{ThemeResource PivotNavButtonMargin}" IsTabStop="False" IsEnabled="False" HorizontalAlignment="Right" VerticalAlignment="Top" Opacity="0" Background="Transparent" /> <ContentPresenter Grid.Row="1" x:Name="RightHeaderPresenter" Grid.Column="2" Content="{TemplateBinding RightHeader}" ContentTemplate="{TemplateBinding RightHeaderTemplate}" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" /> <ItemsPresenter x:Name="PivotItemPresenter" Grid.Row="0" Grid.ColumnSpan="3"> <ItemsPresenter.RenderTransform> <TransformGroup> <TranslateTransform x:Name="ItemsPresenterTranslateTransform" /> <CompositeTransform x:Name="ItemsPresenterCompositeTransform" /> </TransformGroup> </ItemsPresenter.RenderTransform> </ItemsPresenter> </Grid>
这个色块就比较简单了，通过Just Color Picker 把Winform 里面的颜色都给搞出来，通过ItemsControl把他们都布局在一块。
最近使用颜色，这个就是记录最近你点击修改的颜色，我这里用了一个帮助类来进行管理。
internal static class ColorPickerColorHelper { const string ColorPickerRecentColorsKey = "ColorPickerRecentColors.json"; private static ObservableCollection<Color> RecentColors; //private static List<Color> systemColors; //private static List<Color> basicColors; private static bool hasLoadedRecentColors; //public static List<Color> BasicColors //{ // get // { // return basicColors; // } //} static ColorPickerColorHelper() { //basicColors = new List<Color>(); RecentColors = new ObservableCollection<Color>(); //systemColors = new List<Color>(); //foreach (var color in typeof(Colors).GetRuntimeProperties()) //{ // basicColors.Add((Color)color.GetValue(null)); //} } public static async Task<ObservableCollection<Color>> GetRecentColorsAsync() { if (!hasLoadedRecentColors) { hasLoadedRecentColors = true; RecentColors = await GetRecentColorsAsyncInternal(); var temp = await GetRecentColorsAsyncInternal(); if (temp != null) { RecentColors = temp; } } return RecentColors; } public async static Task SetRecentColorsAsync(Color color) { if (RecentColors != null) { if (RecentColors.LastOrDefault() == color) { return; } RecentColors.Add(color); if (RecentColors.Count > 8) { RecentColors.RemoveAt(0); } await SaveRecentColorsAsync(); } } private static async Task<ObservableCollection<Color>> GetRecentColorsAsyncInternal() { var jsonText = await StorageHelper.ReadFileAsync(ColorPickerRecentColorsKey); return JsonConvert.DeserializeObject<ObservableCollection<Color>>(jsonText); } private static async Task SaveRecentColorsAsync() { string jsonText = ""; if (RecentColors.Count > 0) { jsonText = JsonConvert.SerializeObject(RecentColors); } await StorageHelper.WriteFileAsync(ColorPickerRecentColorsKey, jsonText); } } }
第二页是自定义的色盘
这里用到HSL 色彩模式，之前不了解的小伙伴可以先去看一下，RGB→HSL 和 HSL→RGB转换的算法也有。
HSL通道 
透明度通道 这个2个我用到了Slider控件，当然模板我重新写了一下
你可以通过拖拽、点击、键盘上下左右来微调颜色数值，这个属于比较简单的拖拽实现，Ellipse通过计算得出它的位置。
当然你可以通过直接设置ARGB来设置颜色。这个输入框，我设计成了NumericTextBox继承于TextBox控件，支持Format
public class NumericTextBox : TextBox { private bool _isChangingTextWithCode; private bool _isChangingValueWithCode; private const double Epsilon = .00001; public event EventHandler ValueChanged; public double Value { get { return (double)GetValue(ValueProperty); } set { SetValue(ValueProperty, value); } } // Using a DependencyProperty as the backing store for Value. This enables animation, styling, binding, etc... public static readonly DependencyProperty ValueProperty = DependencyProperty.Register("Value", typeof(double), typeof(NumericTextBox), new PropertyMetadata(0.0, new PropertyChangedCallback(OnValueChanged))); private static void OnValueChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { (d as NumericTextBox).UpdateValueText(); (d as NumericTextBox).OnValueChanged(); } public string ValueFormat { get { return (string)GetValue(ValueFormatProperty); } set { SetValue(ValueFormatProperty, value); } } // Using a DependencyProperty as the backing store for ValueFormat. This enables animation, styling, binding, etc... public static readonly DependencyProperty ValueFormatProperty = DependencyProperty.Register("ValueFormat", typeof(string), typeof(NumericTextBox), new PropertyMetadata("F0")); public double Minimum { get { return (double)GetValue(MinimumProperty); } set { SetValue(MinimumProperty, value); } } // Using a DependencyProperty as the backing store for Minimum. This enables animation, styling, binding, etc... public static readonly DependencyProperty MinimumProperty = DependencyProperty.Register("Minimum", typeof(double), typeof(NumericTextBox), new PropertyMetadata(double.MinValue)); public double Maximum { get { return (double)GetValue(MaximumProperty); } set { SetValue(MaximumProperty, value); } } // Using a DependencyProperty as the backing store for Maximum. This enables animation, styling, binding, etc... public static readonly DependencyProperty MaximumProperty = DependencyProperty.Register("Maximum", typeof(double), typeof(NumericTextBox), new PropertyMetadata(double.MaxValue)); public NumericTextBox() { Text = this.Value.ToString(CultureInfo.CurrentCulture); TextChanged += this.OnValueTextBoxTextChanged; KeyDown += this.OnValueTextBoxKeyDown; PointerExited += this.OnValueTextBoxPointerExited; } private void OnValueTextBoxPointerExited(object sender, PointerRoutedEventArgs e) { } private void OnValueTextBoxKeyDown(object sender, KeyRoutedEventArgs e) { } private void OnValueTextBoxTextChanged(object sender, TextChangedEventArgs e) { this.UpdateValueFromText(); } protected override void OnGotFocus(RoutedEventArgs e) { base.OnGotFocus(e); } protected override void OnLostFocus(RoutedEventArgs e) { this.UpdateValueFromText(); base.OnLostFocus(e); } private void UpdateValueText() { _isChangingTextWithCode = true; this.Text = this.Value.ToString(this.ValueFormat); this.SelectionStart = this.Text.Length; _isChangingTextWithCode = false; } private void OnValueChanged() { if (ValueChanged != null) { ValueChanged(null, null); } } private bool UpdateValueFromText() { if (_isChangingTextWithCode) { return false; } double val; if (double.TryParse(this.Text, NumberStyles.Any, CultureInfo.CurrentUICulture, out val) || Calculator.TryCalculate(this.Text, out val)) { _isChangingValueWithCode = true; if (val < Minimum) { val = Minimum; } if (val > Maximum) { val = Maximum; } this.Value = val; UpdateValueText(); _isChangingValueWithCode = false; return true; } else { if (this.Text == "") { this.Value = Minimum; } UpdateValueText(); } return false; } private bool SetValueAndUpdateValidDirections(double value) { // Range coercion is handled by base class. var oldValue = this.Value; if (value < Minimum) { value = Minimum; } if (value > Maximum) { value = Maximum; } this.Value = value; if (value < Minimum || value > Maximum) { UpdateValueText(); } //this.SetValidIncrementDirection(); return Math.Abs(this.Value - oldValue) > Epsilon; } }
最后这个色块就是显示的最终的颜色，点击确认会生产自定义的颜色。这里说一下透明色的效果是怎么做成的。
在我们VS里面当把颜色设置为Transparent的时候，效果是如下图
其实就是添加了些灰色的Rect，知道效果，怎么做就简单了，代码如下
public class TransparentBackground : Grid { public double SquareWidth { get { return (double)GetValue(SquareWidthProperty); } set { SetValue(SquareWidthProperty, value); } } // Using a DependencyProperty as the backing store for SquareWidth. This enables animation, styling, binding, etc... public static readonly DependencyProperty SquareWidthProperty = DependencyProperty.Register("SquareWidth", typeof(double), typeof(TransparentBackground), new PropertyMetadata(4.0, new PropertyChangedCallback(OnUpdateSquares))); private static void OnUpdateSquares(DependencyObject d, DependencyPropertyChangedEventArgs e) { (d as TransparentBackground).UpdateSquares(); } public Brush SquareBrush { get { return (Brush)GetValue(SquareBrushProperty); } set { SetValue(SquareBrushProperty, value); } } // Using a DependencyProperty as the backing store for SquareBrush. This enables animation, styling, binding, etc... public static readonly DependencyProperty SquareBrushProperty = DependencyProperty.Register("SquareBrush", typeof(Brush), typeof(TransparentBackground), new PropertyMetadata(new SolidColorBrush(Color.FromArgb(0xFF, 0xd7, 0xd7, 0xd7)), new PropertyChangedCallback(OnUpdateSquares))); public Brush AlternatingSquareBrush { get { return (Brush)GetValue(AlternatingSquareBrushProperty); } set { SetValue(AlternatingSquareBrushProperty, value); } } // Using a DependencyProperty as the backing store for AlternatingSquareBrush. This enables animation, styling, binding, etc... public static readonly DependencyProperty AlternatingSquareBrushProperty = DependencyProperty.Register("AlternatingSquareBrush", typeof(Brush), typeof(TransparentBackground), new PropertyMetadata(new SolidColorBrush(Colors.White), new PropertyChangedCallback(OnUpdateSquares))); public TransparentBackground() { HorizontalAlignment = HorizontalAlignment.Stretch; VerticalAlignment = VerticalAlignment.Stretch; //this.SizeChanged += (s, e) => //{ // if (e.NewSize != e.PreviousSize) // { // UpdateSquares(); // } //}; } Size pre = Size.Empty; protected override Size ArrangeOverride(Size finalSize) { if (pre != finalSize) { UpdateSquares(finalSize); pre = finalSize; } return base.ArrangeOverride(finalSize); } private void UpdateSquares(Size? finalSize = null) { Size size = finalSize == null ? new Size(this.ActualWidth, this.ActualHeight) : finalSize.Value; //size = new Size(this.ActualWidth, this.ActualHeight); this.Children.Clear(); for (int x = 0; x < size.Width / SquareWidth; x++) { for (int y = 0; y < size.Height / SquareWidth; y++) { var rectangle = new Rectangle(); rectangle.Fill = ((x % 2 == 0 && y % 2 == 0) || (x % 2 == 1 && y % 2 == 1)) ? SquareBrush : AlternatingSquareBrush; rectangle.Width = Math.Max(0, Math.Min(SquareWidth, size.Width - x * SquareWidth)); rectangle.Height = Math.Max(0, Math.Min(SquareWidth, size.Height - y * SquareWidth)); rectangle.Margin = new Thickness(x * SquareWidth, y * SquareWidth, 0, 0); rectangle.HorizontalAlignment = HorizontalAlignment.Left; rectangle.VerticalAlignment = VerticalAlignment.Top; this.Children.Add(rectangle); } } } }
这样子我们整个控件就差不多了。
扩展
由于项目里面，一个页面上需要有很多个这样的控件，感觉如果有10个需要选择颜色的地方，就要有10个实例的话，比较傻，固做以下的扩展。
添加了
Owner 属性-作为ColorPicker 颜色改变的接受源
PlacementTarget 属性- 作为ColorPicker 弹出的Target
Show 方法- 能够使用代码显示ColorPicker
用法如下：
前台Xaml
<control:ColorPicker x:Name="colorPicker" Width="300" Height="40" Opacity="0" Closed="colorPicker_Closed" SelectedColorChanged="colorPicker_SelectedColorChanged" Placement="BottomCenter" HorizontalAlignment="Center" VerticalAlignment="Top" SelectedColor="Transparent" ArrowVisibility="Visible"/> <Rectangle x:Name="rectangle1" Width="100" Height="30" Margin="100" Fill="Green" Tapped="Rectangle_Tapped"/> <Rectangle x:Name="rectangle2" Width="100" Height="30" Margin="100" Fill="Yellow" Tapped="Rectangle_Tapped"/>
后台cs
private void Rectangle_Tapped(object sender, TappedRoutedEventArgs e) { colorPicker.Placement = AdvancedFlyoutPlacementMode.RightCenter; colorPicker.PlacementTarget = (sender as FrameworkElement); colorPicker.Owner = sender; colorPicker.Show(); } private void colorPicker_SelectedColorChanged(object sender, EventArgs e) { if (colorPicker.Owner!=null) { (colorPicker.Owner as Rectangle).Fill = new SolidColorBrush(colorPicker.SelectedColor); colorPicker.Owner = null; } } private void colorPicker_Closed(object sender, object e) { colorPicker.PlacementTarget = null; }
总结
其实ColorPicker这个控件总体来说还是比较简单的，搞清楚UI 和HSL算法就ok。对了Colorpicker是固定了主题Light和大小的，黑色主题太丑了，而且会使色块看着及其不爽，所以背景和主题以及大小我都是写死了的。
AdvancedFlyout
背景
做这个东西，是被微软逼的。
10586 和 14393上面Flyout这个控件 行为上有很大区别。
主要问题是在10586上面，不能支持同时2个Flyout打开，就是说打开一个。再打开下一个的时候会关闭上一个。
没办法，只有自己搞一个。
AdvancedFlyoutBase/AdvancedFlyout
把微软的FlyoutBase/Floyout 属性方法都搞过来，我们自己用Popup来实现。
/// <summary> /// to solve issue that can‘t open two flyouts in 10586. /// </summary> [ContentProperty(Name = nameof(Content))] public class AdvancedFlyout : AdvancedFlyoutBase { public UIElement Content { get; set; } /// <summary> /// FlyoutPresenter Style /// </summary> public Style FlyoutPresenterStyle { get; set; } protected override Control CreatePresenter() { var fp = base.CreatePresenter() as FlyoutPresenter; if (FlyoutPresenterStyle != null) { fp.Style = FlyoutPresenterStyle; } fp.Content = Content; return fp; } }
主要的实现在于控制Popup的位置。
AdvancedFlyoutBase 里面我添加了
FlyoutBase 没有的三个属性：
IsLightDismissEnabled
VerticalOffset
HorizontalOffset
这3个属性都是Popup的。主要是在Placement的基准上再给于用户微调的权利。PlacementMode是一个枚举，比微软的分的更细。
public enum AdvancedFlyoutPlacementMode { TopLeft = 0, TopCenter, TopRight, BottomLeft, BottomCenter, BottomRight, LeftTop, LeftCenter, LeftBottom, RightTop, RightCenter, RightBottom, FullScreen, CenterScreen, }
我们在ShowAt方法中来实现计算Popup的具体位置
public void ShowAt(FrameworkElement placementTarget) { if (Opening != null) { Opening(this, null); } if (_popup == null) { _popup = new Popup(); _popup.ChildTransitions = new TransitionCollection() { new PopupThemeTransition() }; _popup.Opened += _popup_Opened; _popup.Closed += _popup_Closed; _popup.Child = CreatePresenter(); } reCalculatePopupPosition = !CalculatePopupPosition(placementTarget); _popup.IsLightDismissEnabled = IsLightDismissEnabled; this.placementTarget = placementTarget; if (reCalculatePopupPosition || FlyoutPresenter.Style == null) { _popup.Opacity = 0; } _popup.HorizontalOffset += HorizontalOffset; _popup.VerticalOffset += VerticalOffset; _popup.IsOpen = true; }
其中CalculatePopupPosition 是我们的重中之重。
我们计算Popup的位置需要参考下面几样：
1.PlacementTarget在页面上的位置
其实就是控件相对于Window的位置，由以下代码获得
var placementTargetRect = placementTarget.TransformToVisual(Window.Current.Content as FrameworkElement).TransformBounds(new Rect(0, 0, placementTarget.ActualWidth, placementTarget.ActualHeight));
2.弹出页面的大小
FlyoutPresenter的实际大小，由以下代码获得
var fp = FlyoutPresenter; fp.Width = double.NaN; fp.Height = double.NaN; if (fp.DesiredSize == fpSize) { fp.Measure(new Size(double.PositiveInfinity, double.PositiveInfinity)); } fpSize = fp.DesiredSize;
3.Window 的大小
var windowSize = new Size(Window.Current.Bounds.Width, Window.Current.Bounds.Height);
有了之上3个参考数据，那么我们就很容易来计算出Popup显示的位置，
下面以Top为例：
private bool TryHandlePlacementTop(Rect placementTargetRect, Size fpSize, Size windowSize) { if (placementTargetRect.Y - fpSize.Height < 0) { return false; } double x = 0; _popup.VerticalOffset = placementTargetRect.Y - fpSize.Height; if (fpSize.Width > windowSize.Width) { _popup.HorizontalOffset = 0; return true; } switch (Placement) { case AdvancedFlyoutPlacementMode.TopLeft: x = placementTargetRect.X; break; case AdvancedFlyoutPlacementMode.TopCenter: x = placementTargetRect.X + placementTargetRect.Width / 2 - fpSize.Width / 2; if (x < 0) { x = 0; } break; case AdvancedFlyoutPlacementMode.TopRight: x = placementTargetRect.X + placementTargetRect.Width - fpSize.Width; if (x < 0) { x = 0; } break; default: goto case AdvancedFlyoutPlacementMode.TopCenter; } if (x + fpSize.Width > windowSize.Width) { x = windowSize.Width - fpSize.Width; } _popup.HorizontalOffset = x; return true; }
如果target控件上面的空间不够，那么肯定我们不能把Popup放上面，故return false，再尝试把Popup放在其他方位上。
如果可以放的话，我们再按照是Left，Center，Right的参考位置来计算，注意我们要考虑到Window的大小，不能超出Window。
最终Top的代码如下图
case AdvancedFlyoutPlacementMode.TopLeft: case AdvancedFlyoutPlacementMode.TopCenter: case AdvancedFlyoutPlacementMode.TopRight: if (!TryHandlePlacementTop(placementTargetRect, fpSize, windowSize)) { if (!TryHandlePlacementBottom(placementTargetRect, fpSize, windowSize)) { if (!TryHandlePlacementLeft(placementTargetRect, fpSize, windowSize)) { if (!TryHandlePlacementRight(placementTargetRect, fpSize, windowSize)) { TryHandlePlacementCenterScreen(fpSize, windowSize); } } } } break;
在开发过程中发现
如果在Popup Open之前计算FlyoutPresenter的大小，
可能导致Size不正确，如果没有给FlyoutPresenter 赋Style，这个时候还不会使用默认FlyoutPresenter 的样式，Pading，Margin这些参数还没得到赋值。
或者抛异常，比如FlyoutPresenter内部是Pivot的时候会抛异常。
所以我增加了容错。
在计算出错或者FlyoutPresenter的Style 为Null的时候，讲Popup的Opacity设置为0，
并且在Popup Open之后 重写计算位置，然后把Popup Opacity设置1.
if (reCalculatePopupPosition || FlyoutPresenter.Style == null) { _popup.Opacity = 0; } private void _popup_Opened(object sender, object e) { //DesiredSize was not right when style was null before opened //we should re-calcuatePopupPosition after FlyoutPresenter get default values from default style or app resource style if (FlyoutPresenter.Style == null || reCalculatePopupPosition) { CalculatePopupPosition(placementTarget); _popup.HorizontalOffset += HorizontalOffset; _popup.VerticalOffset += VerticalOffset; _popup.Opacity = 1; } if (Opened != null) { Opened(this, e); } }
这样就解决位置不对的问题。。其实我在使用Flyout的时候也遇到过显示的位置从左上角 跳到正确位置的情况，估计跟我这个原因一样。。估计微软也做了容错。不过没把Opacity设置一下。
总结
其实在开发中，有时间去抱怨微软版本控件有问题，不如静下心来想想其他办法，也需会比微软更好的版本，也更容易方便我们自定义。
开源有益，源码GitHub地址。
最后放上2个控件在项目里面的合体照。
