如何将控件属性绑定到另一个窗口属性?

时间:2011-10-27 18:47:29

标签: c# wpf

我有一个窗口,其中有一个矩形。我希望它的填充是另一个矩形填充的渐变停止,但在不同的窗口。 “源”窗口定义为:

<Window x:Class="WPF1.ColorSelectorWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:my="clr-namespace:WPF1"
    x:Name="colorSelectorWindow"
    Title="ColorSelectorWindow" Height="281" Width="540">

有一个矩形

    <Rectangle HorizontalAlignment="Left" Margin="40,120,0,41" Stroke="Black" Width="100" Name="ColorPicker">
        <Rectangle.Fill>
            <SolidColorBrush>
                <SolidColorBrush.Color>
                    ...
                </SolidColorBrush.Color>
            </SolidColorBrush>
        </Rectangle.Fill>
    </Rectangle>

和财产:

public partial class ColorSelectorWindow : Window
{
    public Brush SelectedBrush
    {
        get
        {
            return ColorPicker.Fill;
        }
    }
}

现在,在目标窗口中,我定义了一个矩形:

    <Rectangle Height="213" HorizontalAlignment="Left" Margin="27,8,0,0" Name="rectangle1" VerticalAlignment="Top" Width="25" Grid.Row="1">
        <Rectangle.Fill>
            <LinearGradientBrush StartPoint="0,0" EndPoint="1,0">
                <GradientStop Offset="0" Color="Blue" />
                <GradientStop Offset="1" Color="{Binding ElementName=colorWindowSelector, Path=SelectedBrush, Converter={StaticResource BrushToColorConverter}}" />
            </LinearGradientBrush>
        </Rectangle.Fill>
    </Rectangle>

其中BrushToColorConverter将Brush转换为Color。这不起作用,我不知道为什么,似乎我有一个问题,解决那个“源”窗口..我正在目标窗口构造函数中构建它:

        public MainWindow()
        {
            colorWindow = new ColorSelectorWindow();
            colorWindow.Name = "colorWindowSelector";
            colorWindow.Hide();
            InitializeComponent();
        }

我只是隐藏并展示它,而不是肯定地关闭。如何正确绑定它?

1 个答案:

答案 0 :(得分:1)

你需要在你的MainWindow上有属性暴露的SelectedBrush,你只需要使用RelativeSource绑定到这个Brush的颜色。所以,这将为你做到 -

<Rectangle Height="213" HorizontalAlignment="Left" Margin="27,8,0,0" Name="rectangle1" VerticalAlignment="Top" Width="25" Grid.Row="1">
   <Rectangle.Fill>
     <LinearGradientBrush StartPoint="0,0" EndPoint="1,0">
        <GradientStop Offset="0" Color="Blue" />
        <GradientStop Offset="1" Color="{Binding Path=Owner.SelectedBrush, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType =Window} Converter={StaticResource BrushToColorConverter}}" />
     </LinearGradientBrush>
   </Rectangle.Fill>
</Rectangle>

但请确保在创建窗口时,将其所有者设置为MainWindow -

public MainWindow()
{
   InitializeComponent();
   colorWindow = new ColorSelectorWindow();
   colorWindow.Name = "colorWindowSelector";
   colorWindow.Owner = this;
   colorWindow.Hide();
}