UI Toolkit uses a powerful layout system that automatically calculates the position and size of individual elements based on the layout parameters in their style properties. This is based on Flexbox, a web layout model. For more information, see Layout Engine.
UI 工具包有两种坐标:
Each visual element determines the coordinate system used to calculate its position. You can configure which coordinate system to use in the element stylesheet.
下面的代码演示如何通过代码设置一个视觉元素的坐标空间和位置:
var newElement = new VisualElement();
newElement.style.position = Position.Relative;
newElement.style.left = 15;
newElement.style.top = 35;
元素的原点是其左上角。
The layout system computes the VisualElement.layout
property (type Rect
) for each element, which includes the final position of the element. This takes the relative or absolute position of the element into account.
layout.position
以点 (point) 表示,相对于其父级的坐标空间。
每个 VisualElement
都有一个变换属性 (ITransform
),您可以使用它为元素的位置和旋转添加额外的局部偏移。偏移量并不在计算的布局属性中表示。默认情况下,transform
是标识。
Use the worldBound
property to retrieve the final window space coordinates of the VisualElement
, taking into account both the layout position and the transform. This position includes the height of the header of the window.
VisualElement.layout.position
和 VisualElement.transform
属性用于定义如何在局部坐标系和父坐标系之间进行转换。
The VisualElementExtensions
static class provides the following extension methods that transform points and rectangles between coordinate systems:
WorldToLocal
将 Vector2
或 Rect
从 Panel
空间转换为元素内的参照。LocalToWorld
将 Vector2
或 Rect
转换为 Panel
空间参照。ChangeCoordinatesTo
将 Vector2
或 Rect
从一个元素的局部空间转换为另一个元素的局部空间。Did you find this page useful? Please give it a rating:
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