在 PySide 中创建选框效果 [英] Creating a Marquee effect in PySide
本文介绍了在 PySide 中创建选框效果的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
如何在 Python 中的 PySide
标签中创建选取框效果?我在列表中有一些新闻标题,我希望它们在窗口底部滚动.
解决方案
您可以创建自定义小部件,但为了避免实现许多方法的任务,请利用 QLabel
类,如下所示:
class MarqueeLabel(QLabel):def __init__(self, parent=None):QLabel.__init__(self, parent)self.px = 0self.py = 15self._direction = Qt.LeftToRightself.setWordWrap(True)self.timer = QTimer(self)self.timer.timeout.connect(self.update)self.timer.start(40)self._speed = 2self.textLength = 0self.fontPointSize = 0self.setAlignment(Qt.AlignVCenter)self.setFixedHeight(self.fontMetrics().height())def setFont(self, font):QLabel.setFont(self, font)self.setFixedHeight(self.fontMetrics().height())def updateCoordinates(self):align = self.alignment()如果对齐 == Qt.AlignTop:self.py = 10elif align == Qt.AlignBottom:self.py = self.height() - 10elif 对齐 == Qt.AlignVCenter:self.py = self.height()/2self.fontPointSize = self.font().pointSize()/2self.textLength = self.fontMetrics().width(self.text())def setAlignment(self,alignment):self.updateCoordinates()QLabel.setAlignment(自我,对齐)def resizeEvent(self, event):self.updateCoordinates()QLabel.resizeEvent(self, event)defpaintEvent(self, event):画家 = QPainter(self)如果 self._direction == Qt.RightToLeft:self.px -= self.speed()如果 self.px <= -self.textLength:self.px = self.width()别的:self.px += self.speed()如果 self.px >= self.width():self.px = -self.textLengthPainter.drawText(self.px, self.py + self.fontPointSize, self.text())画家翻译(self.px,0)定义速度(自我):返回 self._speeddef setSpeed(self, speed):self._speed = 速度def setDirection(自我,方向):self._direction = 方向如果 self._direction == Qt.RightToLeft:self.px = self.width() - self.textLength别的:self.px = 0自我更新()定义暂停(自我):self.timer.stop()def取消暂停(自我):self.timer.start()
可以在以下
How would I be able to create a marquee effect in a PySide
Label in Python? I have some news headlines in a list and I would like them to scroll across the bottom of the window.
解决方案
You could create a custom widget but to avoid the task of implementing many methods takes advantage of the QLabel
class as shown below:
class MarqueeLabel(QLabel):
def __init__(self, parent=None):
QLabel.__init__(self, parent)
self.px = 0
self.py = 15
self._direction = Qt.LeftToRight
self.setWordWrap(True)
self.timer = QTimer(self)
self.timer.timeout.connect(self.update)
self.timer.start(40)
self._speed = 2
self.textLength = 0
self.fontPointSize = 0
self.setAlignment(Qt.AlignVCenter)
self.setFixedHeight(self.fontMetrics().height())
def setFont(self, font):
QLabel.setFont(self, font)
self.setFixedHeight(self.fontMetrics().height())
def updateCoordinates(self):
align = self.alignment()
if align == Qt.AlignTop:
self.py = 10
elif align == Qt.AlignBottom:
self.py = self.height() - 10
elif align == Qt.AlignVCenter:
self.py = self.height() / 2
self.fontPointSize = self.font().pointSize() / 2
self.textLength = self.fontMetrics().width(self.text())
def setAlignment(self, alignment):
self.updateCoordinates()
QLabel.setAlignment(self, alignment)
def resizeEvent(self, event):
self.updateCoordinates()
QLabel.resizeEvent(self, event)
def paintEvent(self, event):
painter = QPainter(self)
if self._direction == Qt.RightToLeft:
self.px -= self.speed()
if self.px <= -self.textLength:
self.px = self.width()
else:
self.px += self.speed()
if self.px >= self.width():
self.px = -self.textLength
painter.drawText(self.px, self.py + self.fontPointSize, self.text())
painter.translate(self.px, 0)
def speed(self):
return self._speed
def setSpeed(self, speed):
self._speed = speed
def setDirection(self, direction):
self._direction = direction
if self._direction == Qt.RightToLeft:
self.px = self.width() - self.textLength
else:
self.px = 0
self.update()
def pause(self):
self.timer.stop()
def unpause(self):
self.timer.start()
The following example can be found in the following link.
class Example(QWidget):
def __init__(self, parent=None):
QWidget.__init__(self, parent)
self.setWindowTitle("Marquee Effect")
self.setLayout(QVBoxLayout())
self.marqueeLabel = MarqueeLabel(self)
flayout = QFormLayout()
self.layout().addLayout(flayout)
le = QLineEdit(self)
le.textChanged.connect(self.marqueeLabel.setText)
le.setText("""Lorem ipsum dolor sit amet, consectetur adipiscing elit,
sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.""")
slider = QSlider(Qt.Horizontal, self)
slider.valueChanged.connect(self.marqueeLabel.setSpeed)
slider.setValue(10)
rtl = QRadioButton("Right to Left", self)
ltr = QRadioButton("Left to Rigth", self)
rtl.toggled.connect(lambda state: self.marqueeLabel.setDirection(Qt.RightToLeft if state else Qt.LeftToRight))
ltr.setChecked(True)
directionWidget = QWidget(self)
directionWidget.setLayout(QHBoxLayout())
directionWidget.layout().setContentsMargins(0, 0, 0, 0)
directionWidget.layout().addWidget(rtl)
directionWidget.layout().addWidget(ltr)
fontBtn = QPushButton("Font...", self)
fontBtn.clicked.connect(self.changeFont)
colorBtn = QPushButton("Color...", self)
colorBtn.clicked.connect(self.changeColor)
pauseBtn = QPushButton("Pause", self)
pauseBtn.setCheckable(True)
pauseBtn.toggled.connect(lambda state: self.marqueeLabel.pause() if state else self.marqueeLabel.unpause())
pauseBtn.toggled.connect(lambda state: pauseBtn.setText("Resume") if state else pauseBtn.setText("Pause"))
flayout.addRow("Change Text", le)
flayout.addRow("Change Speed", slider)
flayout.addRow("Direction", directionWidget)
flayout.addRow("fontBtn", fontBtn)
flayout.addRow("colorBtn", colorBtn)
flayout.addRow("Animation", pauseBtn)
self.layout().addWidget(self.marqueeLabel)
def changeColor(self):
palette = self.marqueeLabel.palette()
color = QColorDialog.getColor(palette.brush(QPalette.WindowText).color(), self)
if color.isValid():
palette.setBrush(QPalette.WindowText, color)
self.marqueeLabel.setPalette(palette)
def changeFont(self):
font, ok = QFontDialog.getFont(self.marqueeLabel.font(), self)
if ok:
self.marqueeLabel.setFont(font)
if __name__ == '__main__':
import sys
app = QApplication(sys.argv)
w = Example()
w.show()
sys.exit(app.exec_())
Output:
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