QT把widget轉換成圖片后打印

 

 

 

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)
#/* 打印預覽 */
    preview =QPrintPreviewDialog(printer,widget )   

    """
     * QPrintPreviewDialog類提供了一個打印預覽對話框，里面功能比較全，
     * paintRequested(QPrinter *printer)是系統提供的，
     * 當preview.exec()執行時該信號被觸發，
     * plotPic(QPrinter *printer)是用戶自定義的槽函數，圖像的繪制就在這個函數里。
    """
    preview.paintRequested.connect(plotPic)

    preview.exec(); #/* 等待預覽界面退出 */



def  plotPic(printer):

   
   
    painter =QPainter(printer);
    image = QPixmap()

    image=widget.grab(QRect( QPoint( 0, 0 ), 
                                            QSize( widget.size().width(), 
                                                        widget.size().height()
                                                    ) 
                                        )
                                )# /* 繪制窗口至畫布 */
   #QRect 
    rect = painter.viewport();
   #QSize 
    size = image.size();
    size.scale(rect.size(), Qt.KeepAspectRatio)#     //此處保證圖片顯示完整
    painter.setViewport(rect.x(), rect.y(),size.width(), size.height());
    painter.setWindow(image.rect());

    painter.drawPixmap(0,0,image); #/* 數據顯示至預覽界面 */



import sys

app = QApplication(sys.argv)
tablewidget = QTableWidget()
## 設置列數
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_())