QT把widget转换成图片后打印

 

 

 

from PyQt5.QtWidgets import (QApplication, QWidget, QTableWidget,QPushButton, 

                             QVBoxLayout, 

                            QTableWidgetItem)

from PyQt5.QtGui import  QPixmap, QPainter, QImage, QTextDocument

from PyQt5.QtPrintSupport import  QPrinter, QPrintDialog, QPrintPreviewDialog

from PyQt5.QtCore import QRect, QPoint, QSize ,  Qt







   





def on_picButton_clicked():



    printer =QPrinter(QPrinter.HighResolution)

#/* 打印预览 */

    preview =QPrintPreviewDialog(printer,widget )   



    """

     * QPrintPreviewDialog类提供了一个打印预览对话框，里面功能比较全，

     * paintRequested(QPrinter *printer)是系统提供的，

     * 当preview.exec()执行时该信号被触发，

     * plotPic(QPrinter *printer)是用户自定义的槽函数，图像的绘制就在这个函数里。

    """

    preview.paintRequested.connect(plotPic)



    preview.exec(); #/* 等待预览界面退出 */







def  plotPic(printer):



   

   

    painter =QPainter(printer);

    image = QPixmap()



    image=widget.grab(QRect( QPoint( 0, 0 ), 

                                            QSize( widget.size().width(), 

                                                        widget.size().height()

                                                    ) 

                                        )

                                )# /* 绘制窗口至画布 */

   #QRect 

    rect = painter.viewport();

   #QSize 

    size = image.size();

    size.scale(rect.size(), Qt.KeepAspectRatio)#     //此处保证图片显示完整

    painter.setViewport(rect.x(), rect.y(),size.width(), size.height());

    painter.setWindow(image.rect());



    painter.drawPixmap(0,0,image); #/* 数据显示至预览界面 */







import sys



app = QApplication(sys.argv)

tablewidget = QTableWidget()

## 设置列数

tablewidget.setColumnCount(4)

tablewidget.horizontalHeader().setDefaultSectionSize(150)



## QStringList在PyQt5

header= ["name", "last modify time","type",  "size"]



tablewidget.setHorizontalHeaderLabels(header)

tablewidget.insertRow(0)

tablewidget.insertRow(0)



pItem1 =  QTableWidgetItem("aa" )

pItem2 =  QTableWidgetItem("bb" )

pItem3 =  QTableWidgetItem("cc" )

pItem4 =  QTableWidgetItem("dd" )

tablewidget.setItem( 0, 0, pItem1 )

tablewidget.setItem( 0, 1, pItem2 )

tablewidget.setItem( 0, 2, pItem3 )

tablewidget.setItem( 0, 3, pItem4 )



tablewidget.setMinimumSize(800, 600)







button = QPushButton('打印界面')

button.clicked.connect(on_picButton_clicked)







widget = QWidget()

layout = QVBoxLayout(widget)

layout.addWidget(button)

layout.addWidget(button_txt)

layout.addWidget(tablewidget)

widget.show()



sys.exit(app.exec_())