Pyqt实现无边框窗口拖动以及窗口大小改变

本文实例为大家分享了Pyqt实现无边框窗口拖动及大小改变的具体代码，供大家参考，具体内容如下

做个记录，绘制边框阴影可以忽略这里不是主要

根据网上某位仁兄Qt的实现转过来的大笑，上完整代码

# coding:utf-8
from PyQt4.Qt import *
import sys

PADDING=4  
sys.setrecursionlimit(10000)
class ShadowWidget(QWidget):
 def __init__(self,parent=None):
   super(ShadowWidget,self).__init__(parent)
   self.setWindowFlags(Qt.FramelessWindowHint|Qt.WindowSystemMenuHint)
   self.setAttribute(Qt.WA_TranslucentBackground)
   self.SHADOW_WIDTH=0  #边框距离
   self.isLeftPressDown = False #鼠标左键是否按下
   self.dragPosition=0   #拖动时坐标
   self.Numbers = self.enum(UP=0, DOWN=1, LEFT=2, RIGHT=3, LEFTTOP=4, LEFTBOTTOM=5, RIGHTBOTTOM=6, RIGHTTOP=7, NONE=8) #枚举参数
   self.setMinimumHeight(500) #窗体最小高度
   self.setMinimumWidth(1000) #窗体最小宽度
   self.dir=self.Numbers.NONE #初始鼠标状态
   self.setMouseTracking(True)

#绘制边框阴影
 def drawShadow(self,painter):
   #绘制左上角、左下角、右上角、右下角、上、下、左、右边框
   self.pixmaps=QStringList()
   self.pixmaps.append(QString("./img/border/left_top.png"))
   self.pixmaps.append(QString("./img/border/left_bottom.png"))
   self.pixmaps.append(QString("./img/border/right_top.png"))
   self.pixmaps.append(QString("./img/border/right_bottom.png"))
   self.pixmaps.append(QString("./img/border/top_mid.png"))
   self.pixmaps.append(QString("./img/border/bottom_mid.png"))
   self.pixmaps.append(QString("./img/border/left_mid.png"))
   self.pixmaps.append(QString("./img/border/right_mid.png"))
   painter.drawPixmap(0, 0, self.SHADOW_WIDTH, self.SHADOW_WIDTH, QPixmap(self.pixmaps[0]))  #左上角
   painter.drawPixmap(self.width()-self.SHADOW_WIDTH, 0, self.SHADOW_WIDTH, self.SHADOW_WIDTH, QPixmap(self.pixmaps[2]))  #右上角
   painter.drawPixmap(0,self.height()-self.SHADOW_WIDTH, self.SHADOW_WIDTH, self.SHADOW_WIDTH, QPixmap(self.pixmaps[1]))  #左下角
   painter.drawPixmap(self.width()-self.SHADOW_WIDTH, self.height()-self.SHADOW_WIDTH, self.SHADOW_WIDTH, self.SHADOW_WIDTH, QPixmap(self.pixmaps[3])) #右下角
   painter.drawPixmap(0, self.SHADOW_WIDTH, self.SHADOW_WIDTH, self.height()-2*self.SHADOW_WIDTH, QPixmap(self.pixmaps[6]).scaled(self.SHADOW_WIDTH, self.height()-2*self.SHADOW_WIDTH)) #左
   painter.drawPixmap(self.width()-self.SHADOW_WIDTH, self.SHADOW_WIDTH, self.SHADOW_WIDTH, self.height()-2*self.SHADOW_WIDTH, QPixmap(self.pixmaps[7]).scaled(self.SHADOW_WIDTH, self.height()- 2*self.SHADOW_WIDTH)) #右
   painter.drawPixmap(self.SHADOW_WIDTH, 0, self.width()-2*self.SHADOW_WIDTH, self.SHADOW_WIDTH, QPixmap(self.pixmaps[4]).scaled(self.width()-2*self.SHADOW_WIDTH, self.SHADOW_WIDTH)) #上
   painter.drawPixmap(self.SHADOW_WIDTH, self.height()-self.SHADOW_WIDTH, self.width()-2*self.SHADOW_WIDTH, self.SHADOW_WIDTH, QPixmap(self.pixmaps[5]).scaled(self.width()-2*self.SHADOW_WIDTH, self.SHADOW_WIDTH))  #下

#枚举参数
 def enum(self,**enums):
   return type('Enum', (), enums)

def region(self,cursorGlobalPoint):
   #获取窗体在屏幕上的位置区域，tl为topleft点，rb为rightbottom点
   rect = self.rect()
   tl = self.mapToGlobal(rect.topLeft())
   rb = self.mapToGlobal(rect.bottomRight())

x = cursorGlobalPoint.x()
   y = cursorGlobalPoint.y()

if(tl.x() + PADDING >= x and tl.x() <= x and tl.y() + PADDING >= y and tl.y() <= y):
     #左上角
     self.dir = self.Numbers.LEFTTOP
     self.setCursor(QCursor(Qt.SizeFDiagCursor))  #设置鼠标形状
   elif(x >= rb.x() - PADDING and x <= rb.x() and y >= rb.y() - PADDING and y <= rb.y()):
     #右下角
     self.dir = self.Numbers.RIGHTBOTTOM
     self.setCursor(QCursor(Qt.SizeFDiagCursor))
   elif(x <= tl.x() + PADDING and x >= tl.x() and y >= rb.y() - PADDING and y <= rb.y()):
     #左下角
     self.dir = self.Numbers.LEFTBOTTOM
     self.setCursor(QCursor(Qt.SizeBDiagCursor))
   elif(x <= rb.x() and x >= rb.x() - PADDING and y >= tl.y() and y <= tl.y() + PADDING):
     #右上角
     self.dir = self.Numbers.RIGHTTOP
     self.setCursor(QCursor(Qt.SizeBDiagCursor))
   elif(x <= tl.x() + PADDING and x >= tl.x()):
     #左边
     self.dir = self.Numbers.LEFT
     self.setCursor(QCursor(Qt.SizeHorCursor))
   elif( x <= rb.x() and x >= rb.x() - PADDING):
     #右边

self.dir = self.Numbers.RIGHT
     self.setCursor(QCursor(Qt.SizeHorCursor))
   elif(y >= tl.y() and y <= tl.y() + PADDING):
     #上边
     self.dir = self.Numbers.UP
     self.setCursor(QCursor(Qt.SizeVerCursor))
   elif(y <= rb.y() and y >= rb.y() - PADDING):
     #下边
     self.dir = self.Numbers.DOWN
     self.setCursor(QCursor(Qt.SizeVerCursor))
   else:
     #默认
     self.dir = self.Numbers.NONE
     self.setCursor(QCursor(Qt.ArrowCursor))

def mouseReleaseEvent(self,event):
   if(event.button() == Qt.LeftButton):
     self.isLeftPressDown = False
     if(self.dir != self.Numbers.NONE):
       self.releaseMouse()
       self.setCursor(QCursor(Qt.ArrowCursor))

def mousePressEvent(self,event):
   if(event.button()==Qt.LeftButton):
     self.isLeftPressDown=True
     if(self.dir != self.Numbers.NONE):
       self.mouseGrabber()
     else:
       self.dragPosition = event.globalPos() - self.frameGeometry().topLeft()

def mouseMoveEvent(self,event):
   gloPoint = event.globalPos()
   rect = self.rect()
   tl = self.mapToGlobal(rect.topLeft())
   rb = self.mapToGlobal(rect.bottomRight())

if(not self.isLeftPressDown):
     self.region(gloPoint)  
   else:
     if(self.dir != self.Numbers.NONE):
       rmove=QRect(tl, rb)
       if(self.dir==self.Numbers.LEFT):
         if(rb.x() - gloPoint.x() <= self.minimumWidth()):
           rmove.setX(tl.x())
         else:
           rmove.setX(gloPoint.x())
       elif(self.dir==self.Numbers.RIGHT):
         print u"youbian"
         rmove.setWidth(gloPoint.x() - tl.x())
       elif(self.dir==self.Numbers.UP):
         if(rb.y() - gloPoint.y() <= self.minimumHeight()):
           rmove.setY(tl.y())
         else:
           rmove.setY(gloPoint.y())
       elif(self.dir==self.Numbers.DOWN):
         rmove.setHeight(gloPoint.y() - tl.y())
       elif(self.dir==self.Numbers.LEFTTOP):
         if(rb.x() - gloPoint.x() <= self.minimumWidth()):
           rmove.setX(tl.x())
         else:
           rmove.setX(gloPoint.x())
         if(rb.y() - gloPoint.y() <= self.minimumHeight()):
           rmove.setY(tl.y())
         else:
           rmove.setY(gloPoint.y())
       elif(self.dir==self.Numbers.RIGHTTOP):
         rmove.setWidth(gloPoint.x() - tl.x())
         rmove.setY(gloPoint.y())
       elif(self.dir==self.Numbers.LEFTBOTTOM):
         rmove.setX(gloPoint.x())
         rmove.setHeight(gloPoint.y() - tl.y())
       elif(self.dir==self.Numbers.RIGHTBOTTOM):
         rmove.setWidth(gloPoint.x() - tl.x())
         rmove.setHeight(gloPoint.y() - tl.y())
       else:
         pass
       self.setGeometry(rmove)
     else:
       self.move(event.globalPos() - self.dragPosition)
       event.accept()

if __name__ == '__main__':
 app = QApplication(sys.argv)
 shadow = ShadowWidget()
 shadow.show()
 sys.exit(app.exec_())

来源：https://blog.csdn.net/jylonger/article/details/49665049