QT+=widget
QPrinter
QNetworkAccessManager
QBitmap
QConstString
QT+=gui
QFile
注：非初学常见类弱化处理
QPixmap
QAction
QSize QSizeFQMargins QMarginsF
QPoint QPointFQLine QLineFQRect QRectFQPolygon QPolygonF
QFrame
灰字无边框：不常用
键鼠交互，可绘制。矩形，Z序。
QObject
QDialog
QList
QApplication
画布
针对I/O优化，允许像素操作。支持多彩、alpha混叠。硬件无关
QPdfWriter
QMap
针对图片显示优化。硬件相关，渲染效果有异
QAbstractSocket
QBrushQPenQPainterPath
～画布操作者(方言)
QGuiApplication
QCustomerPaintDevice
QFileDialogQFontDialogQColorDialog
基类
QAbstractButton
常用
QLabel
QTcpSocketQUdpSocket
QTextEdit
QMultiMap
QPaintDevice
QIODevice
QGridLayoutQStackedLayout
QGraphicsScene
QAbstractScrollArea
QPaintEngine
QFileDevice
QEvent
QLayoutItem
QGradientQLineGradientQRadialGradientQConicalGradient
QTemporaryFile
QMovie
QQueue
QFontQFontInfoQFontMetricsQFontMetricsF
QPainter
QStack
QMainWindowQMenuBarQToolBarQStatusBar
QMultiHash
QWidget
QHBoxLayoutQVBoxLayout
QString
QGraphicsItem
QColor
QPushButtonQRadioButtonQCheckButton
QGraphicsView
～传令官
单色
QFileInfo
QImage
QErrorMessage
QT+=network
QPicture
记录/回放QPainter命令
QClipboard
QHash
QBoxLayout
QStringList
QtCore(默认)
QBufferQProcess
QTimeEvent
QMessageBox
QLayout
～翻译官
QIcon
QSslSocket
无边框：较常用
QCursor
QPagedPaintDevice
QVector
QCoreApplication
