2019年8月7日 · 例如，如果您希望将 QSlider 移动到 50% 的位置，可以使用以下代码： ```cpp ui->slider->setValue(ui->slider->maximum() / 2); ``` 这将将 QSlider 移动到其最大值的一半，即 50% 的位置。

The setValue() slot sets the current value of the widget to the new value, and emits valueChanged() if the new value is different from the old one. We synchronize the behavior of the control widgets and the slider widgets through their signals and slots.

2012年6月21日 · For Horizontal slider value will not be calculated correctly. I suggest such variant: setValue(minimum() + (maximum() - minimum()) * (static_cast<float>(event->x()) / static_cast<float>(width()))); Check if its appearance is inverted as well, if it is, minus it the calculated value from maximum().

2018年4月25日 · So the slider will be equally ticked and when the QSlider::valueChanged() signal is emitted, I'd use the value of the slide (0, 1, 2, etc.) as index to the QVector to get the actual value of interest and set that value as the text of the label next to the slide.

2024年12月29日 · QSlider是Qt框架中的一个控件，用于实现滑动条的功能。滑动条是用户界面中的常用控件之一，可以通过拖动滑块来选择一个值，或者通过点击滑条上的位置来快速定位。

2013年1月2日 · Rename the setValue (double) to setValue () and get the value from the slider with slider->value (). Of course you need to implement the setValue function. It's a slot, not a signal. @Engine QSlider valueChanged (int) signal returns integer value. So, your slot must receive int argument that is setValue (int).

The most useful functions are setValue() to set the slider directly to some value; triggerAction() to simulate the effects of clicking (useful for shortcut keys); setSingleStep(), setPageStep() to set the steps; and setMinimum() and setMaximum() to define the range of the scroll bar.

2014年12月26日 · Here's a PyQt solution: """Slider with labels (instead of tick marks) along each available position""" def __init__(self, parent=None): super(Slider, self).__init__(parent) # this decides the range and the labels placed along the slider. self.values = ['one', 'two', 'three', 'four', 'five'] self.setOrientation(Qt.Horizontal) self.setTickInterval(1)

2019年4月2日 · The solution is to override the paintEvent method and use drawText () to write the text on screen. void MySlider::painEvent(...) QSlider:: paintEvent (ev); auto painter = new QPainter (this); painter-> setPen (QPen (Qt::black)); auto rect = this -> geometry (); int numTicks = (maximum () - minimum ())/ tickInterval ();

2023年3月20日 · For Slider, is there a way to trigger an action whenever the value changes, while the slider is being dragged (i.e. not only when the handle is released)? Can the slider automatically display its value numerically as well? Thank you