private Texture2D GetAssetPreview(SerializedProperty property)
{
HeaderImageAttribute headerImageAttribute = PropertyUtility.GetAttribute <HeaderImageAttribute>(property);
Texture2D previewTexture = AssetDatabase.LoadAssetAtPath <Texture2D>(headerImageAttribute.Path);
return(previewTexture);
}
private Vector2 GetAssetPreviewSize(SerializedProperty property)
{
Texture2D previewTexture = GetAssetPreview(property);
if (previewTexture == null)
{
return(Vector2.zero);
}
else
{
HeaderImageAttribute headerImageAttribute
= PropertyUtility.GetAttribute <HeaderImageAttribute>(property);
float width = headerImageAttribute.width.HasValue
? Mathf.Clamp(headerImageAttribute.width.Value, 0, previewTexture.width)
: previewTexture.width;
float height = headerImageAttribute.height.HasValue
? Mathf.Clamp(headerImageAttribute.height.Value, 0, previewTexture.height)
: previewTexture.height;
if (headerImageAttribute.width.HasValue &&
!headerImageAttribute.height.HasValue)
{
// Scale the height properly.
height = previewTexture.height * width / previewTexture.width;
}
if (headerImageAttribute.height.HasValue &&
!headerImageAttribute.width.HasValue)
{
// Scale the width properly.
width = previewTexture.width * height / previewTexture.height;
}
return(new Vector2(width, height));
}
}
protected override void OnGUI_Internal(Rect rect, SerializedProperty property, GUIContent label)
{
EditorGUI.BeginProperty(rect, label, property);
Texture2D previewTexture = GetAssetPreview(property);
HeaderImageAttribute headerImageAttribute
= PropertyUtility.GetAttribute <HeaderImageAttribute>(property);
if (previewTexture != null)
{
float indentLength = NaughtyEditorGUI.GetIndentLength(rect);
var previewSize = GetAssetPreviewSize(property);
float width = rect.width - indentLength;
previewSize = RescaleSize(previewSize, width);
float alignmentLength = 0f;
if (previewSize.x < width)
{
switch (headerImageAttribute.Alignment)
{
case EAlignment.Center:
alignmentLength = (width - previewSize.x) / 2f;
break;
case EAlignment.Right:
alignmentLength = (width - previewSize.x);
break;
case EAlignment.Left:
default:
alignmentLength = 0f;
break;
}
}
Rect propertyRect = new Rect()
{
x = rect.x,
y = rect.y + previewSize.y,
width = width,
height = EditorGUIUtility.singleLineHeight
};
EditorGUI.PropertyField(propertyRect, property, label);
Rect previewRect = new Rect()
{
x = rect.x + indentLength + alignmentLength,
y = rect.y,
// width = rect.width,
width = previewSize.x,
height = previewSize.y
};
GUI.Label(previewRect, previewTexture);
}
else
{
string message = property.name + " has no header image for path: " + headerImageAttribute.Path;
DrawDefaultPropertyAndHelpBox(rect, property, message, MessageType.Warning);
}
EditorGUI.EndProperty();
}
