Demo_MessageChat_Qt:Qt5气泡式聊天框——QListWidget+QPainter。 气泡式聊天的显示是由QListWidget作为控件，每个气泡是由QListWidgetItem提升成QWidget来实现的。每个气泡可以理解为可以自由布置里面内容的QWidget。每个Item保存聊天的对话、发送状态、时间、种类等。这个QWidget主要是显示一个头像+气泡，气泡里面是聊天的内容等。气泡是在paintEvent事件中，采用QPainter来绘制的

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