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python3+PyQt5实现自定义窗口部件Counters

作者：basisworker 时间：2021-05-21 10:47:47　

本文通过Python3+PyQt5实现自定义部件–Counters自定 窗口部件。这个窗口是3*3的网格。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：

python3+PyQt5实现自定义窗口部件Counters

来源：https://blog.csdn.net/xiaoyangyang20/article/details/55803064

标签：python3,PyQt5,窗口
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