![](/img/trans.png)
[英]WPF ColorPicker from wpf/xaml/toolkit binding to property error
[英]Binding WPF Extended Toolkit ColorPicker SelectedColor Property to DependencyProperty
我试图将WPF扩展工具包ColorPicker的SelectedColor
属性绑定到类型为SolidColorBrush
的DependencyProperty
。 然后应将此颜色用作位于画布上/画布中的Shape的填充颜色。
这是行不通的,据我了解,问题是ColorPicker的SelectedColor
属性实际上是具有Color?
类型的对象Color?
。 我的问题是,如何使它工作? 如果我只是通过与事件关联的方法在代码中执行此操作,则可以使用SelectedColor.Value
,但是AFAIK在XAML中不是可选项。
我确实尝试使用常规属性,并让类从INotifyPropertyChanged
继承(因为在SelectedColor绑定中不会从ColorPicker更新为Model ),而不是从DependencyObject
继承,但这也不起作用。
我希望通过Binding来完成此操作,因为我在尝试使用MVVM的实践中试图获得更多。 我只是最近才学会了如何使用MVVM,现在我实际上更喜欢它,所以我真的想避免只使用后台代码。
XAML:
<toolkit:ColorPicker x:Name="fillColor" Grid.Column="1" Grid.Row="8" Margin="5" VerticalAlignment="Top" SelectedColor="{Binding Path=FillColor, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" SelectedColorChanged="fillColor_SelectedColorChanged" />
<toolkit:ColorPicker x:Name="lineColor" Grid.Column="2" Grid.Row="8" Margin="5" VerticalAlignment="Top" />
C#:私有静态DependencyProperty FillColorProperty = DependencyProperty.Register(“ FillColor”,typeof(SolidColorBrush),typeof(TuckboxModel),新FrameworkPropertyMetadata(Brushes.Purple));
private static DependencyProperty LineColorProperty = DependencyProperty.Register("LineColor", typeof(SolidColorBrush),
typeof(TuckboxModel), new FrameworkPropertyMetadata(Brushes.Black));
public SolidColorBrush FillColor
{
get { return (SolidColorBrush)GetValue(FillColorProperty); }
set
{
SetValue(FillColorProperty, value);
}
}
public SolidColorBrush LineColor
{
get { return (SolidColorBrush)GetValue(LineColorProperty); }
set { SetValue(LineColorProperty, value); }
}
public void CreateBox(Canvas drawingCanvas, TuckboxModel model, double width, double height, double depth, SolidColorBrush shading, SolidColorBrush outline)
{
double xOrigin = 50;
double yOrigin = 450;
double xCoord = xOrigin;
double yCoord = yOrigin;
Shape item;
double flapSize;
long count;
//Remove all previous shapes from Canvas
drawingCanvas.Children.Clear();
Path border = new Path();
border.Stroke = model.LineColor;
border.StrokeThickness = 1.0;
border.Fill = model.FillColor;
//border.Fill = shading;
yCoord -= ToPts(depth);
xCoord += ToPts(depth);
RectangleGeometry rectangleA = new RectangleGeometry();
Rect rectA = new Rect(xCoord, yCoord, ToPts(width), ToPts(depth));
rectangleA.Rect = rectA;
xCoord += ToPts(width);
RectangleGeometry rectangleB = new RectangleGeometry();
Rect rectB = new Rect(xCoord + 3, yCoord, ToPts(depth) - 5, ToPts(depth));
rectangleB.Rect = rectB;
xCoord += ToPts(depth);
RectangleGeometry rectangleC = new RectangleGeometry();
Rect rectC = new Rect(xCoord + 2, yCoord, ToPts(width) - 4, ToPts(depth) - 2);
rectangleC.Rect = rectC;
xCoord += ToPts(width);
RectangleGeometry rectangleD = new RectangleGeometry();
Rect rectD = new Rect(xCoord + 2, yCoord, ToPts(depth) - 5, ToPts(depth));
rectangleD.Rect = rectD;
xCoord = xOrigin;
yCoord -= ToPts(height);
RectangleGeometry rectangleE = new RectangleGeometry();
Rect rectE = new Rect(xCoord, yCoord, ToPts(depth), ToPts(height));
rectangleE.Rect = rectE;
xCoord += ToPts(depth);
RectangleGeometry rectangleF = new RectangleGeometry();
Rect rectF = new Rect(xCoord, yCoord, ToPts(width), ToPts(height));
rectangleF.Rect = rectF;
xCoord += ToPts(width);
RectangleGeometry rectangleG = new RectangleGeometry();
Rect rectG = new Rect(xCoord, yCoord, ToPts(depth), ToPts(height));
rectangleG.Rect = rectG;
xCoord += ToPts(depth);
RectangleGeometry rectangleH = new RectangleGeometry();
Rect rectH = new Rect(xCoord, yCoord, ToPts(width), ToPts(height));
rectangleH.Rect = rectH;
xCoord += ToPts(width);
RectangleGeometry rectangleI = new RectangleGeometry();
Rect rectI = new Rect(xCoord, yCoord, ToPts(depth) - 3, ToPts(height));
rectangleI.Rect = rectI;
xCoord = xOrigin;
yCoord -= ToPts(depth);
RectangleGeometry rectangleJ = new RectangleGeometry();
Rect rectJ = new Rect(xCoord + 1, yCoord, ToPts(depth) - 2, ToPts(depth));
rectangleJ.Rect = rectJ;
xCoord += ToPts(depth);
RectangleGeometry rectangleK = new RectangleGeometry();
Rect rectK = new Rect(xCoord, yCoord, ToPts(width), ToPts(depth));
rectangleK.Rect = rectK;
xCoord += ToPts(width);
RectangleGeometry rectangleL = new RectangleGeometry();
Rect rectL = new Rect(xCoord + 1, yCoord, ToPts(depth) - 2, ToPts(depth));
rectangleL.Rect = rectL;
EllipseGeometry ellipseA = new EllipseGeometry();
ellipseA.Center = new Point(rectK.Right - (rectK.Width / 2), yCoord);
ellipseA.RadiusX = rectK.Width / 2;
if(height < 1.0)
flapSize = ToPts(height);
else
flapSize = 72;
ellipseA.RadiusY = flapSize;
GeometryGroup finalShape = new GeometryGroup();
finalShape.Children.Add(rectangleA);
finalShape.Children.Add(rectangleB);
finalShape.Children.Add(rectangleC);
finalShape.Children.Add(rectangleD);
finalShape.Children.Add(rectangleE);
finalShape.Children.Add(rectangleF);
finalShape.Children.Add(rectangleG);
finalShape.Children.Add(rectangleH);
finalShape.Children.Add(rectangleI);
finalShape.Children.Add(rectangleJ);
finalShape.Children.Add(rectangleK);
finalShape.Children.Add(rectangleL);
finalShape.Children.Add(ellipseA);
finalShape.FillRule = FillRule.Nonzero;
border.Data = finalShape;
drawingCanvas.Children.Add(border);
}
任何帮助将不胜感激!
我认为Converter
可以解决您的麻烦。 这是转换器类的示例:
using System;
using System.Globalization;
using System.Windows.Data;
namespace SO_app.Converters
{
public class DebugConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
if (null == value) {
return null;
}
// For a more sophisticated converter, check also the targetType and react accordingly..
if (value is Color) {
Color color = (Color)value;
return new SolidColorBrush(color);
}
// You can support here more source types if you wish
// For the example I throw an exception
Type type = value.GetType();
throw new InvalidOperationException("Unsupported type ["+type.Name+"]");
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
return value;
}
}
}
然后在您的xaml中,它看起来像这样:
这是我的项目:
xmlns:converter="clr-namespace:SO_app.Converters"
然后在资源中:
<converter:DebugConverter x:Key="DebugConverter"/>
然后在xaml中:
<toolkit:ColorPicker x:Name="fillColor" Grid.Column="1" Grid.Row="8" Margin="5" VerticalAlignment="Top" SelectedColor="{Binding Path=FillColor, Converter={StaticResource DebugConverter}, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" SelectedColorChanged="fillColor_SelectedColorChanged" />
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.