如何将QSlider连接到QDoubleSpinBox [英] How to connect a QSlider to QDoubleSpinBox

问题描述

我想将QSlider连接到QDoubleSpinBox，但是虽然代码可以很好地编译并可以在简单的QSpinBox上运行，但它不适用于QDoubleSpinBox

I want to connect a QSlider to a QDoubleSpinBox but while the code compiles fine and runs for simple QSpinBox, it doesn't work for QDoubleSpinBox

QSlider *horizontalSlider1 = new QSlider();
QDoubleSpinBox *spinBox1 = new QDoubleSpinBox();

connect(spinBox1, SIGNAL(valueChanged(double)),horizontalSlider1,SLOT(setValue(double)) );
connect(horizontalSlider1,SIGNAL(valueChanged(double)),spinBox1,SLOT(setValue(double)) );

推荐答案

QSlider和QDoubleSpinBox在<$中采用不同类型的参数c $ c> valueChanged / setValue （当然，QSlider使用整数，而QDoubleSpinBox使用双精度）。更改滑块信号和插槽的参数类型可能会有所帮助：

QSlider and QDoubleSpinBox take different types of arguments in valueChanged/setValue (QSlider uses ints and QDoubleSpinBox uses doubles, of course). Changing the argument type for the slider's signal and slot might help:

connect(spinBox1, SIGNAL(valueChanged(double)),horizontalSlider1,SLOT(setValue(int)) );
connect(horizontalSlider1,SIGNAL(valueChanged(int)),spinBox1,SLOT(setValue(double)) );

我不确定Qt是否可以为您自动处理此类型转换；如果没有，则必须定义自己的插槽以在正确的对象上调用setValue（）

I'm not sure if Qt can automatically handle this type conversion for you; if not, you'll have to define your own slots to call setValue() on the correct object

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