row | 行索引。 |
item | 给定行的项。 |
float 行高。
重载以控制各个行高。
如果需要为 TreeView 中的每个行自定义行矩形,例如当高度因具体内容而异时,则重载此方法。
调用 BuildRow 后,TreeView 针对每个行在内部调用此方法。如果未重载此方法,则 rowHeight
属性将用于所有行。
只有当行高度可能不同时,才应重载此方法;如果所有行的高度均相同,则使用 rowHeight
属性,因为这对于大型数据集更高效。
系统会缓存此方法返回的高度。要更新缓存,请调用 RefreshCustomRowHeights。
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