charactermap.py 文件源码

def paintEvent(self, event):
        painter = QPainter(self)
        painter.fillRect(event.rect(), Qt.white)
        painter.setFont(self.displayFont)

        redrawRect = event.rect()
        beginRow = redrawRect.top() // self.squareSize
        endRow = redrawRect.bottom() // self.squareSize
        beginColumn = redrawRect.left() // self.squareSize
        endColumn = redrawRect.right() // self.squareSize

        painter.setPen(Qt.gray)
        for row in range(beginRow, endRow + 1):
            for column in range(beginColumn, endColumn + 1):
                painter.drawRect(column * self.squareSize,
                        row * self.squareSize, self.squareSize,
                        self.squareSize)

        fontMetrics = QFontMetrics(self.displayFont)
        painter.setPen(Qt.black)
        for row in range(beginRow, endRow + 1):
            for column in range(beginColumn, endColumn + 1):
                key = row * self.columns + column
                painter.setClipRect(column * self.squareSize,
                        row * self.squareSize, self.squareSize,
                        self.squareSize)

                if key == self.lastKey:
                    painter.fillRect(column * self.squareSize + 1,
                            row * self.squareSize + 1, self.squareSize,
                            self.squareSize, Qt.red)

                key_ch = self._chr(key)
                painter.drawText(column * self.squareSize + (self.squareSize / 2) - fontMetrics.width(key_ch) / 2,
                        row * self.squareSize + 4 + fontMetrics.ascent(),
                        key_ch)