class ProgressBar(QWidget):
def __init__(self,parent=None):
super(ProgressBar, self).__init__(parent)
self.initUI()
def initUI(self):
self.pbar=QProgressBar(self)
self.pbar.setGeometry(40,40,200,25)
self.btn=QPushButton('开始',self)
self.btn.move(40,80)
self.btn.clicked.connect(self.doAction)
self.timer=QBasicTimer()
self.value=0
self.setGeometry(300,300,280,170)
self.setWindowTitle('QProgressBar控件')
self.show()
def timerEvent(self, e): #递归？
if self.value>=100:
self.timer.stop()
self.btn.setText('完成')
return
self.value=self.value+1
self.pbar.setValue(self.value)
def doAction(self):
if self.timer.isActive():
self.timer.stop()
self.btn.setText('开始')
else:
self.timer.start(100,self)
self.btn.setText('停止')
class Example(QWidget):
def __init__(self):
super().__init__()
self.initUI()
def initUI(self):
vbox = QVBoxLayout()
self.pbar = QProgressBar() # 3.04 加入布局可省略self !!!
# self.pbar.setGeometry(30, 40, 200, 25)
vbox.addWidget(self.pbar)
self.btn = QPushButton('Start')
# self.btn.move(40, 80)
self.btn.clicked.connect(self.doAction) # 6.02 对比click[bool]
vbox.addWidget(self.btn)
self.setLayout(vbox)
self.timer = QBasicTimer()
self.step = 0
self.setGeometry(300, 300, 600, 400)
self.setWindowTitle('QPressBar')
self.show()
# 重写原生槽函数. 没过一个单位时间, 执行一次
def timerEvent(self, event):
# 到达100%时, 即便点了按钮, 也会马上变为Finished
if self.step >= 100:
self.timer.stop()
self.btn.setText('Finished')
return
self.step = self.step + 1
self.pbar.setValue(self.step)
def doAction(self):
if self.timer.isActive():
self.timer.stop()
self.btn.setText('Start')
else:
self.timer.start(100, self) # 绑定self, 为self及时, 时限100s
self.btn.setText('Stop')
class TapeWidget(QWidget):
X_MARGIN = 0.0
Y_MARGIN = 5.0
def __init__(self, parent=None):
super().__init__(parent)
self.setFocusPolicy(Qt.StrongFocus)
self.setSizePolicy(QSizePolicy.MinimumExpanding, QSizePolicy.Fixed)
self._timer = QBasicTimer()
self._move = 0
self._displace = 0
self._seek_accel = 0
self._header_pos = 0
self._is_seeking = False
self._speed = 1.0
# self._font = QFont("monospaced")
# self._font.setStyleHint(QFont.TypeWriter)
# self._font.setPointSize(11)
@property
def speed(self):
return self._speed
@speed.setter
def speed(self, value: float):
if value <= 0:
raise
self._speed = value
def move_to(self, position: int):
if self._header_pos == position and self._move == position:
return
self._move = position
self._is_seeking = True
self._seek_accel = abs(self._header_pos - position) * self._speed
if not self._timer.isActive():
self._timer.start(10, self)
self.update()
def move_right(self):
self.move_to(self._move + 1)
def move_left(self):
self.move_to(self._move - 1)
def keyPressEvent(self, event):
if event.key() == Qt.Key_Left:
self.move_left()
elif event.key() == Qt.Key_Right:
self.move_right()
def timerEvent(self, event):
if not self._is_seeking:
self._timer.stop()
return
if self._move < self._header_pos:
self._displace += self._seek_accel
if abs(self._displace) >= 20:
self._header_pos -= 1
self._displace = 0
else:
self._displace -= self._seek_accel
if abs(self._displace) >= 20:
self._header_pos += 1
self._displace = 0
if self._header_pos == self._move:
self._timer.stop()
self._is_seeking = False
self.update()
def sizeHint(self):
return self.minimumSizeHint()
def minimumSizeHint(self):
return QSize(0, 40)
def paintEvent(self, event):
painter = QPainter(self)
painter.setPen(Qt.white)
painter.setBrush(Qt.white)
painter.drawRect(event.rect())
painter.setPen(Qt.lightGray)
r = QRect(event.rect()).adjusted(TapeWidget.X_MARGIN,
TapeWidget.Y_MARGIN,
-TapeWidget.X_MARGIN,
-TapeWidget.Y_MARGIN)
# Draw tape
painter.fillRect(r, QColor(Qt.gray).light(150))
painter.drawLine(r.topLeft(), r.topRight())
painter.drawLine(r.bottomLeft(), r.bottomRight())
fm = QFontMetrics(self.font())
center = QPoint(self.width() / 2, self.height() / 2)
cw = fm.width(' ') + 15
# ch = fm.height() + 5
x = self._displace + center.x() + cw / 2
while x > 0:
x -= cw
painter.drawLine(x, r.y() + 5, x, r.bottom() - 5)
x = self._displace + center.x() - cw / 2
while x < self.width():
x += cw
painter.drawLine(x, r.y() + 5, x, r.bottom() - 5)
# Draw head
color = QColor('#00a8ff')
color.setAlpha(100)
painter.setBrush(color)
painter.drawRect(center.x() - 15, 3, 29, 33)