Message in Chinese (Simplified) (中文(简体))![](/img/flags/zh-Hans.png)
每当按下具有 DropDownButton 样式的按钮时发生。
Unlocalized message![](/img/flags/en.png)
Occurs whenever a button with the DropDownButton style is pressed.
Search by Google每当按下具有 DropDownButton 样式的按钮时发生。
Occurs whenever a button with the DropDownButton style is pressed.
Search by Google