前言
wpf本身没有提供颜色板之类的控件,有些业务使用场景需要使用颜色板之类的控件,比如设置弹幕的颜色或设置文本的颜色等。这里提供一种颜色板的简单实现方法。
一、如何实现?
1、使用ObjectDataProvider
ObjectDataProvider是wpf中xaml绑定.net任意t类型的媒介,通过ObjectDataProvider可以直接获取到System.Windows.Media.Brushes类的属性列表。System.Windows.Media.Brushes中定义了常见的颜色刷子。
2、定义转换器
由于ObjectDataProvider获取的Brushes属性集合是反射集合,并不是直接的Brush对象,所以需要进行数据的转换,定义一个转换器,将属性(PropertyInfo)转换成Brush对象。
3、绑定容器
绑定容器的ItemsSource属性并使用上述的转换器,通过定义ItemTemplate自定义颜色的显示控件。
二、使用示例
本示例使用的是ComboBox作为容器显示颜色板。
1.代码
xaml代码如下(示例):
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< Window x:Class = "WpfApp1.MainWindow" xmlns = "http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x = "http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d = "http://schemas.microsoft.com/expression/blend/2008" xmlns:mc = "http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:sys = "clr-namespace:System;assembly=mscorlib" xmlns:local = "clr-namespace:WpfApp1" mc:Ignorable = "d" Title = "MainWindow" Height = "720" Width = "1280" > < Window.Resources > < ResourceDictionary > < ObjectDataProvider ObjectInstance = "{x:Type Brushes}" MethodName = "GetProperties" x:Key = "Brushes" /> < local:BrushTypeConverter x:Key = "BrushTypeConverter" ></ local:BrushTypeConverter > </ ResourceDictionary > </ Window.Resources > < Grid > < ComboBox Margin = "0,-200,0,0" Width = "240" Height = "60" ItemsSource = "{Binding Source={StaticResource Brushes}}" SelectedItem = "{Binding ForeColor}" > < ComboBox.ItemContainerStyle > < Style TargetType = "ComboBoxItem" > < Setter Property = "Template" > < Setter.Value > < ControlTemplate TargetType = "ComboBoxItem" > < Rectangle Width = "210" Height = "46" Margin = "2,2,2,2" Stroke = "#cccccc" StrokeThickness = "1" RadiusX = "5" RadiusY = "5" Fill = "{Binding RelativeSource={x:Static RelativeSource.Self},Path=DataContext,Converter={StaticResource BrushTypeConverter}}" ></ Rectangle > </ ControlTemplate > </ Setter.Value > </ Setter > </ Style > </ ComboBox.ItemContainerStyle > < ComboBox.Template > < ControlTemplate TargetType = "ComboBox" > < Grid > < ToggleButton Cursor = "Hand" BorderThickness = "0" BorderBrush = "Transparent" Panel.ZIndex = "1" IsChecked = "{Binding Path=IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" ClickMode = "Press" > < ToggleButton.Template > < ControlTemplate > < StackPanel Orientation = "Horizontal" Background = "Transparent" > < Rectangle Width = "210" Height = "46" Margin = "7,0,5,0" Stroke = "#cccccc" StrokeThickness = "1" RadiusX = "5" RadiusY = "5" Fill = "{Binding SelectedItem, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ComboBox}},Converter={StaticResource BrushTypeConverter}}" ></ Rectangle > < Polyline Grid.Column = "1" Points = "0,0 5,6 10,0" Margin = "0,0,10,0" Width = "10" Height = "6" Stretch = "Fill" Stroke = "Black" StrokeThickness = "1" /> </ StackPanel > </ ControlTemplate > </ ToggleButton.Template > </ ToggleButton > < Popup IsOpen = "{TemplateBinding IsDropDownOpen}" Placement = "Bottom" x:Name = "Popup" Focusable = "False" AllowsTransparency = "True" PopupAnimation = "Slide" > < Border CornerRadius = "1" MaxHeight = "{TemplateBinding MaxDropDownHeight}" MinWidth = "{TemplateBinding ActualWidth}" x:Name = "DropDown" SnapsToDevicePixels = "True" > < ScrollViewer Margin = "4,6,4,6" MaxHeight = "{TemplateBinding MaxDropDownHeight}" SnapsToDevicePixels = "True" HorizontalScrollBarVisibility = "Auto" VerticalScrollBarVisibility = "Auto" CanContentScroll = "True" > <!--StackPanel 用于显示子级,方法是将 IsItemsHost 设置为 True--> < StackPanel IsItemsHost = "True" KeyboardNavigation.DirectionalNavigation = "Contained" Background = "White" /> </ ScrollViewer > </ Border > </ Popup > </ Grid > </ ControlTemplate > </ ComboBox.Template > </ ComboBox > </ Grid > </ Window > |
转换器代码如下(示例):
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public class BrushTypeConverter : IValueConverter { public object Convert( object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { if (value == null ) return null ; PropertyInfo propertyInfo = value as PropertyInfo; return propertyInfo.GetValue(value) as SolidColorBrush; } public object ConvertBack( object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { return null ; } } |
2.显示效果
效果如下(示例):
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原文链接:https://blog.csdn.net/u013113678/article/details/120782488