如何以编程方式维护wpf中对象的宽高比

Question

我以编程方式将具有特定宽度和高度的Border添加到网格中。但是，我想获得以下任一项：

1. 使边框保持纵横比并填充使其在网格内尽可能大
2. 每当网格向下或向上缩放时制作边框比例（因此不是特别大可能，更像是网格的百分比）

目前，这是我调整窗口大小的情况：

Color borderColor = (Color)ColorConverter.ConvertFromString(BorderColor);
Color backgroundColor = (Color)ColorConverter.ConvertFromString(BackgroundColor);

Border border = new Border();
border.BorderThickness = new Thickness(BorderSize);
border.CornerRadius = new CornerRadius(TopLeftCornerRadius, TopRightCornerRadius, BottomRightCornerRadius, BottomLeftCornerRadius);
border.BorderBrush = (SolidColorBrush)(new BrushConverter().ConvertFrom(BorderColor));
border.Background = (SolidColorBrush)(new BrushConverter().ConvertFrom(BackgroundColor));

border.Width = Width;
border.Height = Height;

border.Margin = new Thickness(10);

previewgrid.Children.Add(border);

正常情况：



缩放情况：



所以我希望它能够正确调整大小并保持在白色矩形内。顺便说一句，白色网格有一个边距，你可以看到;-) 提前谢谢！

Answer 1

正如lerthe61所建议的那样，只需使用Viewbox，其Stretch属性设置为Uniform：

Color borderColor = (Color)ColorConverter.ConvertFromString(BorderColor);
Color backgroundColor = (Color)ColorConverter.ConvertFromString(BackgroundColor);

Border border = new Border();
border.BorderThickness = new Thickness(BorderSize);
border.CornerRadius = new CornerRadius(TopLeftCornerRadius, TopRightCornerRadius, BottomRightCornerRadius, BottomLeftCornerRadius);
border.BorderBrush = (SolidColorBrush)(new BrushConverter().ConvertFrom(BorderColor));
border.Background = (SolidColorBrush)(new BrushConverter().ConvertFrom(BackgroundColor));

border.Width = Width;
border.Height = Height;

border.Margin = new Thickness(10);

Viewbox viewBox = new Viewbox();
viewBox.Stretch = Stretch.Uniform;
viewBox.Child = border;

previewgrid.Children.Add(viewBox);

请注意，如果previewgrid为Canvas，则此解决方案无效。 我希望它可以帮到你。

Answer 2

最简单的方法：

UITextField *searchTextField = [_searchBar valueForKey:@"_searchField"];
searchTextField.textAlignment = NSTextAlignmentRight

通过C＃：

 <Grid Margin="50">
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="50" />
        <ColumnDefinition Width="*" />
        <ColumnDefinition Width="50" />
    </Grid.ColumnDefinitions>
    <Border CornerRadius="50,0,0,50"
            Background="Green" />
    <Border CornerRadius="0"
            Grid.Column="1"
            Background="Green" />
    <Border CornerRadius="0,50,50,0"
            Grid.Column="2"
            Background="Green" />

</Grid>

正常：

调整大小：

这对你来说够好吗？