在 Metro Style 应用程序上计算 ViewBox ScaleFactor

问题描述

有没有办法获得 ViewBox 在 XAML Windows 8 Metro Style App 中缩放其内容的比例因子

Is there any way to get the scale factor by which a ViewBox scales its content in a XAML Windows 8 Metro Style App

推荐答案

WinRTXAMLToolit 对此有一个扩展.

public static double GetChildScaleX(this Viewbox viewbox)
{
    if (viewbox.Child == null)
        throw new InvalidOperationException("Can't tell effective scale of a Viewbox child for a Viewbox with no child.");

    var fe = viewbox.Child as FrameworkElement;

    if (fe == null)
        throw new InvalidOperationException("Can't tell effective scale of a Viewbox child for a Viewbox with a child that is not a FrameworkElement.");

    if (fe.ActualWidth == 0)
        throw new InvalidOperationException("Can't tell effective scale of a Viewbox child for a Viewbox with a child that is not laid out.");

    return viewbox.ActualWidth / fe.ActualWidth;
}

GetChildScaleY 是一样的，但是有高度.

GetChildScaleY is the same, but with Heights.

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