Question

我使用了我在网上找到的一个例子来创建自定义网格控件。它允许我放置我想要制作日历的那种网格线。但现在，当我去设置背景时，它会停止我的自定义网格线显示。

我知道这是b / c首先调用OnRender，然后是背景，它正在摆脱我的自定义设置。我打破了OnRender的覆盖，但仍然没有运气。所以我的问题是如何制作一个自定义背景，仍然可以显示网格线。

这是我想要的自定义控件背景：如果我尝试将其添加到自定义控件，我的网格线就会消失。

    <Grid.Background>
        <RadialGradientBrush>
            <GradientStop Color="#FFC3D6F5" Offset="0" />
            <GradientStop Color="#FFEFF5FF" Offset="1" />
        </RadialGradientBrush>
    </Grid.Background>

这是我在网上找到的自定义控件。它只设置customgridline属性。我现在需要一个自定义背景属性。这有点难，因为我的背景不是纯色。

namespace Camp_
{    
public class GridControl : Grid
{

    #region Properties
    public bool ShowCustomGridLines
    {
        get { return (bool)GetValue(ShowCustomGridLinesProperty); }
        set { SetValue(ShowCustomGridLinesProperty, value); }
    }



    public static readonly DependencyProperty ShowCustomGridLinesProperty =
        DependencyProperty.Register("ShowCustomGridLines", typeof(bool), typeof(GridControl), new UIPropertyMetadata(false));

    public Brush GridLineBrush
    {
        get { return (Brush)GetValue(GridLineBrushProperty); }
        set { SetValue(GridLineBrushProperty, value); }
    }


    public static readonly DependencyProperty GridLineBrushProperty =
        DependencyProperty.Register("GridLineBrush", typeof(Brush), typeof(GridControl), new UIPropertyMetadata(Brushes.Black));



    public double GridLineThickness
    {
        get { return (double)GetValue(GridLineThicknessProperty); }
        set { SetValue(GridLineThicknessProperty, value); }
    }

    public static readonly DependencyProperty GridLineThicknessProperty =
        DependencyProperty.Register("GridLineThickness", typeof(double), typeof(GridControl), new UIPropertyMetadata(1.0));
    #endregion

    protected override void OnRender(DrawingContext dc)
    {  

        if (ShowCustomGridLines)
        {

            foreach (var rowDefinition in RowDefinitions)
            {
                dc.DrawLine(new Pen(GridLineBrush, GridLineThickness), new Point(0, rowDefinition.Offset), new Point(ActualWidth, rowDefinition.Offset));
            }

            foreach (var columnDefinition in ColumnDefinitions)
            {
                dc.DrawLine(new Pen(GridLineBrush, GridLineThickness), new Point(columnDefinition.Offset, 0), new Point(columnDefinition.Offset, ActualHeight));
            } 
            dc.DrawRectangle(Brushes.Transparent, new Pen(GridLineBrush, GridLineThickness), new Rect(0, 0, ActualWidth, ActualHeight));
        }
        base.OnRender(dc);
    }

    static GridControl()
    {
        DefaultStyleKeyProperty.OverrideMetadata(typeof(GridControl), new FrameworkPropertyMetadata(typeof(GridControl)));
    }
}
}

和XAML：

<customgridcontrol:GridControl ShowCustomGridLines="True" GridLineBrush="CornflowerBlue" ShowGridLines="False" >
                    <Grid.RowDefinitions>
                        <RowDefinition />
                        <RowDefinition />
                        <RowDefinition />
                        <RowDefinition />
                        <RowDefinition />
                        <RowDefinition />
                    </Grid.RowDefinitions>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition />
                        <ColumnDefinition />
                        <ColumnDefinition />
                        <ColumnDefinition />
                        <ColumnDefinition />
                        <ColumnDefinition />
                        <ColumnDefinition />
                    </Grid.ColumnDefinitions>
</customgridcontrol:GridControl>

Answer 1

我认为您只需在xaml代码中设置标准背景属性，如下所示：

<customgridcontrol:GridControl ShowCustomGridLines="True" GridLineBrush="CornflowerBlue" ShowGridLines="False" Background="Binding{ StaticResource BrushYouWantTo" >
                <Grid.RowDefinitions>
                    <RowDefinition />
                    <RowDefinition />
                    <RowDefinition />
                    <RowDefinition />
                    <RowDefinition />
                    <RowDefinition />
                </Grid.RowDefinitions>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition />
                    <ColumnDefinition />
                    <ColumnDefinition />
                    <ColumnDefinition />
                    <ColumnDefinition />
                    <ColumnDefinition />
                    <ColumnDefinition />
                </Grid.ColumnDefinitions>
</customgridcontrol:GridControl>

“你想要的画笔”必须在xaml代码中设置为资源，如下所示：

<Window.Resources>
   <RadialGradientBrush Name="BrushYouWantTo">
      <GradientStop Color="#FFC3D6F5" Offset="0" />
      <GradientStop Color="#FFEFF5FF" Offset="1" />
   </RadialGradientBrush>
</Window.Resources>

但是如果你想在程序运行时更改背景颜色，你需要一个依赖属性和一个重新加载gui的事件处理程序。要使用此事件处理程序，您必须使用

定义它

new UIPropertyMetadata(CustomGridBackgroundChanged)

事件处理程序定义如下所示：

  private static void CustomGridBackgroundChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
  {
     WindowName win = (WindowName)sender;
     if (win.PropertyChanged != null)
     {
        // at this place the gui will be reloaded
        win.PropertyChanged(win, new PropertyChangedEventArgs(null));
     }
  }

这只是一个想法，所以我真的不知道它是否在实践中有效... 但我希望它对你有所帮助

如何为自定义gridcontrol设置自定义后台依赖项属性

1 个答案: