在ViewBox中获取项目的大小(“拉伸"后) [英] Get the size (after it has been "stretched") of an item in a ViewBox

问题描述

请考虑以下内容:

假设窗口"为1024x768，而视图框"填充了整个窗口， 这意味着TextBox在屏幕上确实很大.

Let's say the Window is 1024x768 and the ViewBox fills the entire window, this means the TextBox is really large on the screen.

我想获取当前在屏幕上的TextBox的大小. 如果我得到DesiredSize或ActualSize甚至RenderedSize，我总是得到100.

I want to get the size of the TextBox as it is currently on the screen. If I get DesiredSize or ActualSize or even RenderedSize I always get 100.

有什么建议吗?

更新:我可能可以获取ViewBox的ActualWidth并将其除以其子级的ActualWidth，这将为我提供当前的比例因子，并以某种方式将该属性公开为属性，但是我不确定这是最好的方法.

Update: I could probably get the ActualWidth of the ViewBox and divide it by the ActualWidth of it's child which would give me the current scale factor and expose that as a property somehow but I'm not sure that's the best way to do it.

推荐答案

这是您获取ScaleTransform施加在其子元素上的ScaleTransform的方式:

This is how you get the ScaleTransform the ViewBox exerts on its children:

var child = VisualTreeHelper.GetChild(viewBox, 0) as ContainerVisual;
var scale = child.Transform as ScaleTransform;

此处viewBox是文本框所在的ViewBox. 然后，您可以将scale.ScaleX * textBox.ActualWidth乘以得到屏幕坐标的大小

Here viewBox is the ViewBox that textbox sits in. Then you can just multiply scale.ScaleX * textBox.ActualWidth and you get the size in Screen coordinates

但是它变得更加容易！要直接在屏幕坐标中获取文本框的大小，请执行以下操作:

But it gets even easier! To get that textbox's size directly in Screen Coordinates you do:

textbox.PointToScreen(new Point(textbox.ActualWidth,textbox.ActualHeight)) - textbox.PointToScreen(new Point(0,0))

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