Represents a delegate that is used to reference the method that will handle window messages.

表示一个委托，该委托用于引用将处理窗口消息的方法。

youdao

Message Interception: Allow applications to intercept window messages sent to the containing window.

消息截获：允许应用程序截获发向所属窗口的Window消息。

youdao

The data transfer thread will be blocked until the transfer is complete, so it will not be able to process the window messages as soon as they arrive.

数据传输线程在完成传输前将被阻塞，因此在窗口消息到达时它将不能及时处理这些消息。

youdao

The new compose window, popping out of the bottom of the screen, feels almost like a chat window, meant to suit users who fire off short messages as opposed to those who crank out 1, 000 words in a first message.

FORBES: Connect