python实现分页效果

#!/usr/bin/python  
#-*-coding:utf-8-*- 
 
from PyQt4.QtCore import * 
from PyQt4.QtGui import * 
 
class PageWidget(QWidget): 
  def __init__(self,parent=None): 
    super(PageWidget,self).__init__(parent) 
    self.btns=[] 
    self.count=0 
    self.presign=0      #当前点击标识 
    self.nextsign=0     #当前点击标识 
    self.pre_button=QPushButton() 
    self.pre_button.setText("<<") 
    self.pre_button.setFixedSize(25,25) 
    self.connect(self.pre_button,SIGNAL("clicked()"),self,SLOT("prepage()")) 
    self.next_button=QPushButton() 
    self.next_button.setText(">>") 
    self.connect(self.next_button,SLOT("nextpage()")) 
    self.next_button.setFixedSize(25,25) 
    self.center_layout=QHBoxLayout() 
    self.nextpage() 
 
    self.page_layput=QHBoxLayout() 
    self.page_layput.addWidget(self.pre_button) 
    self.page_layput.addLayout(self.center_layout) 
    self.page_layput.addWidget(self.next_button) 
    self.setLayout(self.page_layput) 
 
  @pyqtSlot() 
  def prepage(self): 
    self.presign=1 
    self.num=0 
    if (len(self.btns)>0) and (self.count>=10): 
      for p in range(10): 
        self.center_layout.removeWidget(self.btns[p]) 
        self.btns[p].deleteLater() 
      self.btns=[] 
    if self.count>=10: 
      if self.nextsign==1: 
        self.count=self.count-20 
        self.nextsign=0 
      else: 
        self.count=self.count-10 
      self.num=self.count 
 
      for i in range(10): 
        self.num+=1 
        self.center_button=QPushButton() 
        self.center_button.setText(str(self.num)) 
        self.center_button.setFixedSize(25,25) 
        self.btns.append(self.center_button) 
        self.center_layout.addWidget(self.center_button) 
      #print self.count 
  @pyqtSlot() 
  def nextpage(self): 
    self.nextsign=1 
    if len(self.btns)>0: 
      for p in range(10): 
        self.center_layout.removeWidget(self.btns[p]) 
        self.btns[p].deleteLater() 
      self.btns=[] 
    if self.presign==1: 
      self.count=self.count+10 
      self.presign=0 
    #mapper转有参数 
    signal_mapper = QSignalMapper(self) 
    for i in range(10): 
      self.count+=1 
      self.center_button=QPushButton() 
      self.center_button.setText(str(self.count)) 
      self.center_button.setFixedSize(25,25) 
      self.btns.append(self.center_button) 
      self.connect(self.center_button,signal_mapper,SLOT("map()")) 
      signal_mapper.setMapping(self.center_button,str(self.count)) 
      self.center_layout.addWidget(self.center_button) 
    self.connect(signal_mapper,SIGNAL("mapped(QString)"),SLOT("showpage(QString)")) 
    #print self.count 
 
  @pyqtSlot(QString) 
  def showpage(self,page): 
    print page 
 
if __name__=='__main__': 
  import sys 
  app=QApplication(sys.argv) 
  page=PageWidget() 
  page.show() 
  sys.exit(app.exec_())