Python QTableView.itemDelegate方法代码示例

# 需要导入模块: from PyQt5.QtWidgets import QTableView [as 别名]
# 或者: from PyQt5.QtWidgets.QTableView import itemDelegate [as 别名]

#.........这里部分代码省略.........
        self.setWindowTitle("Pixelator")
        self.resize(640, 480)

    def chooseImage(self):
        fileName, _ = QFileDialog.getOpenFileName(self, "Choose an Image",
                self.currentPath, '*')

        if fileName:
            self.openImage(fileName)

    def openImage(self, fileName):
        image = QImage()

        if image.load(fileName):
            self.model.setImage(image)

            if not fileName.startswith(':/'):
                self.currentPath = fileName
                self.setWindowTitle("%s - Pixelator" % self.currentPath)

            self.printAction.setEnabled(True)
            self.updateView()

    def printImage(self):
        if self.model.rowCount(QModelIndex()) * self.model.columnCount(QModelIndex()) > 90000:
            answer = QMessageBox.question(self, "Large Image Size",
                    "The printed image may be very large. Are you sure that "
                    "you want to print it?",
                    QMessageBox.Yes | QMessageBox.No)
            if answer == QMessageBox.No:
                return

        printer = QPrinter(QPrinter.HighResolution)

        dlg = QPrintDialog(printer, self)
        dlg.setWindowTitle("Print Image")

        if dlg.exec_() != QDialog.Accepted:
            return

        painter = QPainter()
        painter.begin(printer)

        rows = self.model.rowCount(QModelIndex())
        columns = self.model.columnCount(QModelIndex())
        sourceWidth = (columns+1) * ItemSize
        sourceHeight = (rows+1) * ItemSize

        painter.save()

        xscale = printer.pageRect().width() / float(sourceWidth)
        yscale = printer.pageRect().height() / float(sourceHeight)
        scale = min(xscale, yscale)

        painter.translate(printer.paperRect().x()+printer.pageRect().width()/2,
                          printer.paperRect().y()+printer.pageRect().height()/2)
        painter.scale(scale, scale)
        painter.translate(-sourceWidth/2, -sourceHeight/2)

        option = QStyleOptionViewItem()
        parent = QModelIndex()

        progress = QProgressDialog("Printing...", "Cancel", 0, rows, self)
        progress.setWindowModality(Qt.ApplicationModal)
        y = ItemSize / 2.0

        for row in range(rows):
            progress.setValue(row)
            QApplication.processEvents()
            if progress.wasCanceled():
                break

            x = ItemSize / 2.0

            for column in range(columns):
                option.rect = QRect(x, y, ItemSize, ItemSize)
                self.view.itemDelegate().paint(painter, option,
                        self.model.index(row, column, parent))
                x += ItemSize

            y += ItemSize

        progress.setValue(rows)

        painter.restore()
        painter.end()

        if progress.wasCanceled():
            QMessageBox.information(self, "Printing canceled",
                    "The printing process was canceled.", QMessageBox.Cancel)

    def showAboutBox(self):
        QMessageBox.about(self, "About the Pixelator example",
                "This example demonstrates how a standard view and a custom\n"
                "delegate can be used to produce a specialized "
                "representation\nof data in a simple custom model.")

    def updateView(self):
        self.view.resizeColumnsToContents()
        self.view.resizeRowsToContents()