PyQt：无边框自定义标题栏及最大化最小化窗体大小调整

环境

　　Python3.5.2

　　PyQt5

陈述

　　隐藏掉系统的控制栏，实现了自定义的标题控制栏，以及关闭/最大化/最小化的功能，自由调整窗体大小的功能（跟随一个大佬学的），代码内有详细注释

　　只要把MainWindow类自己实现就可以了，我把左侧栏的demo（可以看我这篇https://www.cnblogs.com/jyroy/p/9457882.html）搭载上了，效果如下

　　标题栏的风格我和左侧栏的风格统一了，还是模仿网易云音乐的红色格调（我觉得网易云的红色很ok）

代码

 #!/usr/bin/env python
 # -*- coding:utf-8 -*-
 # Author: jyroy
 import sys

 from PyQt5.QtCore import QSize
 from PyQt5.QtWidgets import QApplication
 from PyQt5.QtCore import Qt, pyqtSignal, QPoint
 from PyQt5.QtGui import QFont, QEnterEvent, QPainter, QColor, QPen
 from PyQt5.QtWidgets import QWidget, QVBoxLayout, QHBoxLayout, QLabel,QSpacerItem, QSizePolicy, QPushButton
 from PyQt5.QtGui import QIcon
 from PyQt5.QtWidgets import QWidget, QVBoxLayout, QPushButton, QTextEdit
 from LeftTabWidget import LeftTabWidget
 # 样式
 StyleSheet = """
 /*标题栏*/
 TitleBar {
     background-color: red;
 }
 /*最小化最大化关闭按钮通用默认背景*/
 #buttonMinimum,#buttonMaximum,#buttonClose {
     border: none;
     background-color: red;
 }
 /*悬停*/
 #buttonMinimum:hover,#buttonMaximum:hover {
     background-color: red;
     color: white;
 }
 #buttonClose:hover {
     color: white;
 }
 /*鼠标按下不放*/
 #buttonMinimum:pressed,#buttonMaximum:pressed {
     background-color: Firebrick;
 }
 #buttonClose:pressed {
     color: white;
     background-color: Firebrick;
 }
 """

 class TitleBar(QWidget):

     # 窗口最小化信号
     windowMinimumed = pyqtSignal()
     # 窗口最大化信号
     windowMaximumed = pyqtSignal()
     # 窗口还原信号
     windowNormaled = pyqtSignal()
     # 窗口关闭信号
     windowClosed = pyqtSignal()
     # 窗口移动
     windowMoved = pyqtSignal(QPoint)

     def __init__(self, *args, **kwargs):
         super(TitleBar, self).__init__(*args, **kwargs)
         # 支持qss设置背景
         self.setAttribute(Qt.WA_StyledBackground, True)
         self.mPos = None
         self.iconSize = 20  # 图标的默认大小
         # 设置默认背景颜色,否则由于受到父窗口的影响导致透明
         self.setAutoFillBackground(True)
         palette = self.palette()
         palette.setColor(palette.Window, QColor(240, 240, 240))
         self.setPalette(palette)
         # 布局
         layout = QHBoxLayout(self, spacing=0)
         layout.setContentsMargins(0, 0, 0, 0)
         # 窗口图标
         self.iconLabel = QLabel(self)
 #         self.iconLabel.setScaledContents(True)
         layout.addWidget(self.iconLabel)
         # 窗口标题
         self.titleLabel = QLabel(self)
         self.titleLabel.setMargin(2)
         layout.addWidget(self.titleLabel)
         # 中间伸缩条
         layout.addSpacerItem(QSpacerItem(
             40, 20, QSizePolicy.Expanding, QSizePolicy.Minimum))
         # 利用Webdings字体来显示图标
         font = self.font() or QFont()
         font.setFamily('Webdings')
         # 最小化按钮
         self.buttonMinimum = QPushButton(
             '', self, clicked=self.windowMinimumed.emit, font=font, objectName='buttonMinimum')
         layout.addWidget(self.buttonMinimum)
         # 最大化/还原按钮
         self.buttonMaximum = QPushButton(
             '', self, clicked=self.showMaximized, font=font, objectName='buttonMaximum')
         layout.addWidget(self.buttonMaximum)
         # 关闭按钮
         self.buttonClose = QPushButton(
             'r', self, clicked=self.windowClosed.emit, font=font, objectName='buttonClose')
         layout.addWidget(self.buttonClose)
         # 初始高度
         self.setHeight()

     def showMaximized(self):
         if self.buttonMaximum.text() == '':
             # 最大化
             self.buttonMaximum.setText('')
             self.windowMaximumed.emit()
         else:  # 还原
             self.buttonMaximum.setText('')
             self.windowNormaled.emit()

     def setHeight(self, height=38):
         """设置标题栏高度"""
         self.setMinimumHeight(height)
         self.setMaximumHeight(height)
         # 设置右边按钮的大小
         self.buttonMinimum.setMinimumSize(height, height)
         self.buttonMinimum.setMaximumSize(height, height)
         self.buttonMaximum.setMinimumSize(height, height)
         self.buttonMaximum.setMaximumSize(height, height)
         self.buttonClose.setMinimumSize(height, height)
         self.buttonClose.setMaximumSize(height, height)

     def setTitle(self, title):
         """设置标题"""
         self.titleLabel.setText(title)

     def setIcon(self, icon):
         """设置图标"""
         self.iconLabel.setPixmap(icon.pixmap(self.iconSize, self.iconSize))

     def setIconSize(self, size):
         """设置图标大小"""
         self.iconSize = size

     def enterEvent(self, event):
         self.setCursor(Qt.ArrowCursor)
         super(TitleBar, self).enterEvent(event)

     def mouseDoubleClickEvent(self, event):
         super(TitleBar, self).mouseDoubleClickEvent(event)
         self.showMaximized()

     def mousePressEvent(self, event):
         """鼠标点击事件"""
         if event.button() == Qt.LeftButton:
             self.mPos = event.pos()
         event.accept()

     def mouseReleaseEvent(self, event):
         '''鼠标弹起事件'''
         self.mPos = None
         event.accept()

     def mouseMoveEvent(self, event):
         if event.buttons() == Qt.LeftButton and self.mPos:
             self.windowMoved.emit(self.mapToGlobal(event.pos() - self.mPos))
         event.accept()

 # 枚举左上右下以及四个定点
 Left, Top, Right, Bottom, LeftTop, RightTop, LeftBottom, RightBottom = range(8)

 class FramelessWindow(QWidget):

     # 四周边距
     Margins = 5

     def __init__(self, *args, **kwargs):
         super(FramelessWindow, self).__init__(*args, **kwargs)

         self._pressed = False
         self.Direction = None
         # 背景透明
         self.setAttribute(Qt.WA_TranslucentBackground, True)
         # 无边框
         self.setWindowFlags(Qt.FramelessWindowHint)  # 隐藏边框
         # 鼠标跟踪
         self.setMouseTracking(True)
         # 布局
         layout = QVBoxLayout(self, spacing=0)
         # 预留边界用于实现无边框窗口调整大小
         layout.setContentsMargins(
             self.Margins, self.Margins, self.Margins, self.Margins)
         # 标题栏
         self.titleBar = TitleBar(self)
         layout.addWidget(self.titleBar)
         # 信号槽
         self.titleBar.windowMinimumed.connect(self.showMinimized)
         self.titleBar.windowMaximumed.connect(self.showMaximized)
         self.titleBar.windowNormaled.connect(self.showNormal)
         self.titleBar.windowClosed.connect(self.close)
         self.titleBar.windowMoved.connect(self.move)
         self.windowTitleChanged.connect(self.titleBar.setTitle)
         self.windowIconChanged.connect(self.titleBar.setIcon)

     def setTitleBarHeight(self, height=38):
         """设置标题栏高度"""
         self.titleBar.setHeight(height)

     def setIconSize(self, size):
         """设置图标的大小"""
         self.titleBar.setIconSize(size)

     def setWidget(self, widget):
         """设置自己的控件"""
         if hasattr(self, '_widget'):
             return
         self._widget = widget
         # 设置默认背景颜色,否则由于受到父窗口的影响导致透明
         self._widget.setAutoFillBackground(True)
         palette = self._widget.palette()
         palette.setColor(palette.Window, QColor(240, 240, 240))
         self._widget.setPalette(palette)
         self._widget.installEventFilter(self)
         self.layout().addWidget(self._widget)

     def move(self, pos):
         if self.windowState() == Qt.WindowMaximized or self.windowState() == Qt.WindowFullScreen:
             # 最大化或者全屏则不允许移动
             return
         super(FramelessWindow, self).move(pos)

     def showMaximized(self):
         """最大化,要去除上下左右边界,如果不去除则边框地方会有空隙"""
         super(FramelessWindow, self).showMaximized()
         self.layout().setContentsMargins(0, 0, 0, 0)

     def showNormal(self):
         """还原,要保留上下左右边界,否则没有边框无法调整"""
         super(FramelessWindow, self).showNormal()
         self.layout().setContentsMargins(
             self.Margins, self.Margins, self.Margins, self.Margins)

     def eventFilter(self, obj, event):
         """事件过滤器,用于解决鼠标进入其它控件后还原为标准鼠标样式"""
         if isinstance(event, QEnterEvent):
             self.setCursor(Qt.ArrowCursor)
         return super(FramelessWindow, self).eventFilter(obj, event)

     def paintEvent(self, event):
         """由于是全透明背景窗口,重绘事件中绘制透明度为1的难以发现的边框,用于调整窗口大小"""
         super(FramelessWindow, self).paintEvent(event)
         painter = QPainter(self)
         painter.setPen(QPen(QColor(255, 255, 255, 1), 2 * self.Margins))
         painter.drawRect(self.rect())

     def mousePressEvent(self, event):
         """鼠标点击事件"""
         super(FramelessWindow, self).mousePressEvent(event)
         if event.button() == Qt.LeftButton:
             self._mpos = event.pos()
             self._pressed = True

     def mouseReleaseEvent(self, event):
         '''鼠标弹起事件'''
         super(FramelessWindow, self).mouseReleaseEvent(event)
         self._pressed = False
         self.Direction = None

     def mouseMoveEvent(self, event):
         """鼠标移动事件"""
         super(FramelessWindow, self).mouseMoveEvent(event)
         pos = event.pos()
         xPos, yPos = pos.x(), pos.y()
         wm, hm = self.width() - self.Margins, self.height() - self.Margins
         if self.isMaximized() or self.isFullScreen():
             self.Direction = None
             self.setCursor(Qt.ArrowCursor)
             return
         if event.buttons() == Qt.LeftButton and self._pressed:
             self._resizeWidget(pos)
             return
         if xPos <= self.Margins and yPos <= self.Margins:
             # 左上角
             self.Direction = LeftTop
             self.setCursor(Qt.SizeFDiagCursor)
         elif wm <= xPos <= self.width() and hm <= yPos <= self.height():
             # 右下角
             self.Direction = RightBottom
             self.setCursor(Qt.SizeFDiagCursor)
         elif wm <= xPos and yPos <= self.Margins:
             # 右上角
             self.Direction = RightTop
             self.setCursor(Qt.SizeBDiagCursor)
         elif xPos <= self.Margins and hm <= yPos:
             # 左下角
             self.Direction = LeftBottom
             self.setCursor(Qt.SizeBDiagCursor)
         elif 0 <= xPos <= self.Margins and self.Margins <= yPos <= hm:
             # 左边
             self.Direction = Left
             self.setCursor(Qt.SizeHorCursor)
         elif wm <= xPos <= self.width() and self.Margins <= yPos <= hm:
             # 右边
             self.Direction = Right
             self.setCursor(Qt.SizeHorCursor)
         elif self.Margins <= xPos <= wm and 0 <= yPos <= self.Margins:
             # 上面
             self.Direction = Top
             self.setCursor(Qt.SizeVerCursor)
         elif self.Margins <= xPos <= wm and hm <= yPos <= self.height():
             # 下面
             self.Direction = Bottom
             self.setCursor(Qt.SizeVerCursor)

     def _resizeWidget(self, pos):
         """调整窗口大小"""
         if self.Direction == None:
             return
         mpos = pos - self._mpos
         xPos, yPos = mpos.x(), mpos.y()
         geometry = self.geometry()
         x, y, w, h = geometry.x(), geometry.y(), geometry.width(), geometry.height()
         if self.Direction == LeftTop:  # 左上角
             if w - xPos > self.minimumWidth():
                 x += xPos
                 w -= xPos
             if h - yPos > self.minimumHeight():
                 y += yPos
                 h -= yPos
         elif self.Direction == RightBottom:  # 右下角
             if w + xPos > self.minimumWidth():
                 w += xPos
                 self._mpos = pos
             if h + yPos > self.minimumHeight():
                 h += yPos
                 self._mpos = pos
         elif self.Direction == RightTop:  # 右上角
             if h - yPos > self.minimumHeight():
                 y += yPos
                 h -= yPos
             if w + xPos > self.minimumWidth():
                 w += xPos
                 self._mpos.setX(pos.x())
         elif self.Direction == LeftBottom:  # 左下角
             if w - xPos > self.minimumWidth():
                 x += xPos
                 w -= xPos
             if h + yPos > self.minimumHeight():
                 h += yPos
                 self._mpos.setY(pos.y())
         elif self.Direction == Left:  # 左边
             if w - xPos > self.minimumWidth():
                 x += xPos
                 w -= xPos
             else:
                 return
         elif self.Direction == Right:  # 右边
             if w + xPos > self.minimumWidth():
                 w += xPos
                 self._mpos = pos
             else:
                 return
         elif self.Direction == Top:  # 上面
             if h - yPos > self.minimumHeight():
                 y += yPos
                 h -= yPos
             else:
                 return
         elif self.Direction == Bottom:  # 下面
             if h + yPos > self.minimumHeight():
                 h += yPos
                 self._mpos = pos
             else:
                 return
         self.setGeometry(x, y, w, h)

 class MainWindow(QWidget):

     def __init__(self, *args, **kwargs):
         super(MainWindow, self).__init__(*args, **kwargs)
         layout = QVBoxLayout(self, spacing=0)
         layout.setContentsMargins(0, 0, 0, 0)

         self.left_tag = LeftTabWidget()
         layout.addWidget(self.left_tag)

 if __name__ == '__main__':

     app = QApplication(sys.argv)
     app.setStyleSheet(StyleSheet)
     mainWnd = FramelessWindow()
     mainWnd.setWindowTitle('测试标题栏')
     mainWnd.setWindowIcon(QIcon('Qt.ico'))
     mainWnd.resize(QSize(1250,780))
     mainWnd.setWidget(MainWindow(mainWnd))  # 把自己的窗口添加进来
     mainWnd.show()
     sys.exit(app.exec_())

效果展示

拓展知识

设置窗口尺寸的方法：
1.设置宽度和高度。
　　resize(int w,int h)
　　resize(QSize s)
2.设置窗口的位置、宽度和高度。
　　setGeometry(int X,int Y,int W,int H)
　　setGeometry(QRect r)
3.设置窗口为固定值。
　　setFixedSize(int w,int h)
　　setFixedSize(QSize s)
　　注意：窗口标题栏上的最大化按钮无效；用鼠标无法调整窗口尺寸。
4.设置窗口为固定值。
　　setFixedWidth(int w)
　　窗口标题栏上的最大化按钮无效；用鼠标无法调整窗口的宽度。
5.设置窗口为固定值。
　　setFixedHeight(int h)
　　窗口标题栏上的最大化按钮无效；用鼠标无法调整窗口的高度。
5.设置窗口的最小尺寸。
　　setMinimumSize(int w,int h)
　　setMinimumSize(QSize s)
　　用鼠标可以让窗口变宽、变高。
　　设置窗口的最小宽度：
　　　　setMinimumWidth(int w)
　　设置窗口的最小高度：
　　　　setMinimumHeight(int h)
6.设置窗口的最大尺寸。
　　setMaximumSize(int w,int h)
　　setMaximumSize(QSize s)
　　用鼠标可以让窗口变宽、变高。
　　设置窗口的最小宽度：
　　　　setMaximumWidth(int w)
　　设置窗口的最小高度：
　　　　setMaximumHeight(int h)

 

说明

　　因为只是自己写的简单的例子，在窗口方面都是利用的写死的大小。不同的电脑像素会有差别。我的是1920*1080的设备。在实际用的时候尽量加上判断，来适应不同的设备。