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_()) 

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持我们。