python3+PyQt5如何实现自定义窗口部件Counters-创新互联

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本文有两个例子如下：

/home/yrd/eric_workspace/chap11/counters.py。
/home/yrd/eric_workspace/chap11/counters_dnd.py

第二个例子在第一个例子的基础上实现能通过鼠标拖拽球到不同的网格中。

/home/yrd/eric_workspace/chap11/counters.py

#!/usr/bin/env python3

from PyQt5.QtCore import (QRectF, QSize, Qt)
from PyQt5.QtWidgets import (QApplication, QSizePolicy,QWidget)
from PyQt5.QtGui import QPainter,QPen

BLANK, RED, YELLOW = range(3)


class CountersWidget(QWidget):

  def __init__(self, parent=None):
    super(CountersWidget, self).__init__(parent)
    self.setSizePolicy(QSizePolicy(QSizePolicy.Expanding,
                    QSizePolicy.Expanding))
    self.grid = [[BLANK] * 3 for i in range(3)]
    self.selected = [0, 0]
    self.setMinimumSize(self.minimumSizeHint())


  def sizeHint(self):
    return QSize(200, 200)


  def minimumSizeHint(self):
    return QSize(100, 100)


  def mousePressEvent(self, event):
    xOffset = self.width() / 3
    yOffset = self.height() / 3
    if event.x() < xOffset:
      x = 0
    elif event.x() < 2 * xOffset:
      x = 1
    else:
      x = 2
    if event.y() < yOffset:
      y = 0
    elif event.y() < 2 * yOffset:
      y = 1
    else:
      y = 2
    cell = self.grid[x][y]
    if cell == BLANK:
      cell = RED
    elif cell == RED:
      cell = YELLOW
    else:
      cell = BLANK
    self.grid[x][y] = cell
    self.selected = [x, y]
    self.update()


  def keyPressEvent(self, event):
    if event.key() == Qt.Key_Left:
      self.selected[0] = (2 if self.selected[0] == 0
                else self.selected[0] - 1)
    elif event.key() == Qt.Key_Right:
      self.selected[0] = (0 if self.selected[0] == 2
                else self.selected[0] + 1)
    elif event.key() == Qt.Key_Up:
      self.selected[1] = (2 if self.selected[1] == 0
                else self.selected[1] - 1)
    elif event.key() == Qt.Key_Down:
      self.selected[1] = (0 if self.selected[1] == 2
                else self.selected[1] + 1)
    elif event.key() == Qt.Key_Space:
      x, y = self.selected
      cell = self.grid[x][y]
      if cell == BLANK:
        cell = RED
      elif cell == RED:
        cell = YELLOW
      else:
        cell = BLANK
      self.grid[x][y] = cell
    self.update()


  def paintEvent(self, event=None):
    painter = QPainter(self)
    painter.setRenderHint(QPainter.Antialiasing, True)
    xOffset = self.width() / 3
    yOffset = self.height() / 3
    for x in range(3):
      for y in range(3):
        cell = self.grid[x][y]
        rect = (QRectF(x * xOffset, y * yOffset,
            xOffset, yOffset).adjusted(0.5, 0.5, -0.5, -0.5))
        color = None
        if cell == RED:
          color = Qt.red
        elif cell == YELLOW:
          color = Qt.yellow
        if color is not None:
          painter.save()
          painter.setPen(Qt.black)
          painter.setBrush(color)
          painter.drawEllipse(rect.adjusted(2, 2, -2, -2))
          painter.restore()
        if [x, y] == self.selected:
          painter.setPen(QPen(Qt.blue, 3))
        else:
          painter.setPen(Qt.black)
        painter.drawRect(rect)


if __name__ == "__main__":
  import sys

  app = QApplication(sys.argv)
  form = CountersWidget()
  form.setWindowTitle("Counters")
  form.show()
  app.exec_()

/home/yrd/eric_workspace/chap11/counters_dnd.py

#!/usr/bin/env python3

from PyQt5.QtCore import (QRectF, QSize, Qt)
from PyQt5.QtWidgets import (QApplication, QSizePolicy,QWidget)
from PyQt5.QtGui import QPainter,QPen,QPixmap,QCursor
BLANK, RED, YELLOW = range(3)


class CountersWidget(QWidget):

  def __init__(self, parent=None):
    super(CountersWidget, self).__init__(parent)
    self.setSizePolicy(QSizePolicy(QSizePolicy.Expanding,
                    QSizePolicy.Expanding))
    self.grid = [[BLANK] * 3 for i in range(3)]
    self.selected = [0, 0]
    self.setMinimumSize(self.minimumSizeHint())


  def sizeHint(self):
    return QSize(200, 200)


  def minimumSizeHint(self):
    return QSize(100, 100)


  def _xFromEventX(self, event):
    xOffset = self.width() / 3
    if event.x() < xOffset:
      x = 0
    elif event.x() < 2 * xOffset:
      x = 1
    else:
      x = 2
    return x


  def _yFromEventY(self, event):
    yOffset = self.width() / 3
    if event.y() < yOffset:
      y = 0
    elif event.y() < 2 * yOffset:
      y = 1
    else:
      y = 2
    return y


  def mouseDoubleClickEvent(self, event):
    x = self._xFromEventX(event)
    y = self._yFromEventY(event)
    cell = self.grid[x][y]
    if cell == BLANK:
      cell = RED
    elif cell == RED:
      cell = YELLOW
    else:
      cell = BLANK
    self.grid[x][y] = cell
    self.selected = [x, y]
    self.update()


  def keyPressEvent(self, event):
    if event.key() == Qt.Key_Left:
      self.selected[0] = (2 if self.selected[0] == 0
                else self.selected[0] - 1)
    elif event.key() == Qt.Key_Right:
      self.selected[0] = (0 if self.selected[0] == 2
                else self.selected[0] + 1)
    elif event.key() == Qt.Key_Up:
      self.selected[1] = (2 if self.selected[1] == 0
                else self.selected[1] - 1)
    elif event.key() == Qt.Key_Down:
      self.selected[1] = (0 if self.selected[1] == 2
                else self.selected[1] + 1)
    elif event.key() == Qt.Key_Space:
      x, y = self.selected
      cell = self.grid[x][y]
      if cell == BLANK:
        cell = RED
      elif cell == RED:
        cell = YELLOW
      else:
        cell = BLANK
      self.grid[x][y] = cell
    self.update()


  def paintEvent(self, event=None):
    painter = QPainter(self)
    painter.setRenderHint(QPainter.Antialiasing, True)
    xOffset = self.width() / 3
    yOffset = self.height() / 3
    for x in range(3):
      for y in range(3):
        cell = self.grid[x][y]
        rect = (QRectF(x * xOffset, y * yOffset,
            xOffset, yOffset).adjusted(0.5, 0.5, -0.5, -0.5))
        color = None
        if cell == RED:
          color = Qt.red
        elif cell == YELLOW:
          color = Qt.yellow
        if color is not None:
          painter.save()
          painter.setPen(Qt.black)
          painter.setBrush(color)
          painter.drawEllipse(rect.adjusted(2, 2, -2, -2))
          painter.restore()
        if [x, y] == self.selected:
          painter.setPen(QPen(Qt.blue, 3))
        else:
          painter.setPen(Qt.black)
        painter.drawRect(rect)


  def mousePressEvent(self, event):
    self.x = self._xFromEventX(event)
    self.y = self._yFromEventY(event)
    cell = self.grid[self.x][self.y]
    color = Qt.darkGray
    if cell == RED:
      color = Qt.red
    elif cell == YELLOW:
      color = Qt.yellow
    pixmap = QPixmap(12, 12)
    pixmap.fill(color)
    self.setCursor(QCursor(pixmap))


  def mouseReleaseEvent(self, event):
    x = self._xFromEventX(event)
    y = self._yFromEventY(event)
    if self.x != x or self.y != y:
      cell = self.grid[self.x][self.y]
      self.grid[self.x][self.y] = BLANK
      self.grid[x][y] = cell
      self.selected = [x, y]
      self.update()
    self.setCursor(Qt.ArrowCursor)


if __name__ == "__main__":
  import sys

  app = QApplication(sys.argv)
  form = CountersWidget()
  form.setWindowTitle("Counters")
  form.show()
  app.exec_()

运行结果：

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