DecoratorDrawer

Description

用于派生自定义装饰器绘制器的基类。

DecoratorDrawer 类似于 PropertyDrawer，但它不绘制属性，而是纯粹基于从其对应的 PropertyAttribute 中获取的数据来绘制装饰元素。

Unity 对 SpaceAttribute 和 HeaderAttribute 使用内置的 DecoratorDrawer。您还可以使用匹配的 PropertyAttribute 创建您自己的 DecoratorDrawer。

尽管 DecoratorDrawer 从概念上讲并不意味着要与特定字段相关联，但其属性仍需放在脚本中的字段上。然而，与 PropertyDrawer 属性不同，同一字段上可以有多个 DecoratorDrawer 属性。同样与 PropertyDrawer 不同，如果 DecoratorDrawer 属性放在为列表或数组的字段上，则该装饰器只会在此数组前显示一次，而不是针对每个数组元素显示。

以下示例有两个脚本。

第一个脚本定义了名为 "ColorSpacer" 的示例属性，然后定义了用于决定如何在检视面板中绘制它的 DecoratorDrawer。

第二个脚本是一个示例 MonoBehaviour，它使用 ColorSpacer 属性在检视面板中直观地分隔两组公共属性。

// Name this script "ColorSpacerExample"

using UnityEngine;
using System.Collections;
using UnityEditor;

// This class defines the ColorSpacer attribute, so that
// it can be used in your regular MonoBehaviour scripts:

public class ColorSpacer : PropertyAttribute
{
    public float spaceHeight;
    public float lineHeight;
    public float lineWidth;
    public Color lineColor = Color.red;

    public ColorSpacer(float spaceHeight, float lineHeight, float lineWidth, float r, float g, float b)
    {
        this.spaceHeight = spaceHeight;
        this.lineHeight = lineHeight;
        this.lineWidth = lineWidth;

        // unfortunately we can't pass a color through as a Color object
        // so we pass as 3 floats and make the object here
        this.lineColor = new Color(r, g, b);
    }
}


// This defines how the ColorSpacer should be drawn
// in the inspector, when inspecting a GameObject with
// a MonoBehaviour which uses the ColorSpacer attribute

[CustomPropertyDrawer(typeof(ColorSpacer))]
public class ColorSpacerDrawer : DecoratorDrawer
{
    ColorSpacer colorSpacer
    {
        get { return ((ColorSpacer)attribute); }
    }

    public override float GetHeight()
    {
        return base.GetHeight() + colorSpacer.spaceHeight;
    }

    public override void OnGUI(Rect position)
    {
        // calculate the rect values for where to draw the line in the inspector
        float lineX = (position.x + (position.width / 2)) - colorSpacer.lineWidth / 2;
        float lineY = position.y + (colorSpacer.spaceHeight / 2);
        float lineWidth = colorSpacer.lineWidth;
        float lineHeight = colorSpacer.lineHeight;

        // Draw the line in the calculated place in the inspector
        // (using the built in white pixel texture, tinted with GUI.color)
        Color oldGuiColor = GUI.color;
        GUI.color = colorSpacer.lineColor;
        EditorGUI.DrawPreviewTexture(new Rect(lineX, lineY, lineWidth, lineHeight), Texture2D.whiteTexture);
        GUI.color = oldGuiColor;
    }
}

这里的第二个脚本是指使用上面定义的 ColorSpacer 属性的脚本：

using UnityEngine;
using System.Collections;

public class ShowDecoratorDrawerExample : MonoBehaviour
{
    public int a = 1;
    public int b = 2;
    public int c = 3;

    // this shows our custom Decorator Drawer between the groups of properties
    [ColorSpacer(30, 3, 100, 1, 0, 0)]

    public string d = "d";
    public string e = "e";
    public string f = "f";
}

Variables

Public Functions

Inherited members