多轻多软的雪花啊，在空中飘舞着，追逐着，像—朵朵精巧的白菊。暗黄色的天际中像燃着一团百年都没有澌灭的野火，它肆无忌惮的吞噬着天间彩云，仿佛地狱使者受到差遣，来破坏天际的和谐。
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：
本文python3+PyQt5实现自定义窗口部件Counters到此结束。人生为棋，我愿为卒，行动虽慢，可谁又曾看见我后退一步。小编再次感谢大家对我们的支持！
