标准对话框

QColorDialog	用于指定颜色的对话部件
QFileDialog	允许用户选择文件或目录的对话框
QFontDialog	用于选择字体的对话部件
QInputDialog	从用户处获取单个值的简单方便对话框
QMessageBox	用于通知用户或向用户提问并得到答复的模态对话框
QProgressDialog	反馈慢速操作的进度

对话窗口样式和样式感知部件

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