主窗口.XAML：
<Window x:Class="TestWPFApp.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Name="myMainWindow"
Title="MainWindow" Width="200" Height="250">
<Grid Name="MainGrid" SizeChanged="MainGrid_SizeChanged">
<Grid.LayoutTransform>
<ScaleTransform x:Name="ApplicationScaleTransform"
CenterX="0"
CenterY="0"
ScaleX="{Binding ElementName=myMainWindow, Path=ScaleValue}"
ScaleY="{Binding ElementName=myMainWindow, Path=ScaleValue}" />
</Grid.LayoutTransform>
<Grid VerticalAlignment="Center" HorizontalAlignment="Center" Height="150">
<TextBlock FontSize="20" Text="Hello World" Margin="5" VerticalAlignment="Top" HorizontalAlignment="Center"/>
<Button Content="Button" VerticalAlignment="Bottom" HorizontalAlignment="Center" Name="myButton"/>
</Grid>
</Grid>
</Window>
主窗口代码隐藏：
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
#region ScaleValue Depdency Property
public static readonly DependencyProperty ScaleValueProperty = DependencyProperty.Register("ScaleValue", typeof(double), typeof(MainWindow), new UIPropertyMetadata(1.0, new PropertyChangedCallback(OnScaleValueChanged), new CoerceValueCallback(OnCoerceScaleValue)));
private static object OnCoerceScaleValue(DependencyObject o, object value)
{
MainWindow mainWindow = o as MainWindow;
if (mainWindow != null)
return mainWindow.OnCoerceScaleValue((double)value);
else
return value;
}
private static void OnScaleValueChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)
{
MainWindow mainWindow = o as MainWindow;
if (mainWindow != null)
mainWindow.OnScaleValueChanged((double)e.OldValue, (double)e.NewValue);
}
protected virtual double OnCoerceScaleValue(double value)
{
if (double.IsNaN(value))
return 1.0f;
value = Math.Max(0.1, value);
return value;
}
protected virtual void OnScaleValueChanged(double oldValue, double newValue)
{
}
public double ScaleValue
{
get
{
return (double)GetValue(ScaleValueProperty);
}
set
{
SetValue(ScaleValueProperty, value);
}
}
#endregion
private void MainGrid_SizeChanged(object sender, EventArgs e)
{
CalculateScale();
}
private void CalculateScale()
{
double yScale = ActualHeight / 250f;
double xScale = ActualWidth / 200f;
double value = Math.Min(xScale, yScale);
ScaleValue = (double)OnCoerceScaleValue(MainGrid, value);
}
}
我有这个示例应用程序。我在MainGrid上应用 LayoutTransform 以通过调整窗口大小来缩放应用程序。如何避免我的控件myButton应用该转换？我不希望该转换适用于它。