QAccessibleValueInterface Class
The QAccessibleValueInterface class implements support for objects that manipulate a value. 更多...
| 头文件: | #include <QAccessibleValueInterface> |
| qmake: | QT += gui |
公有函数
| virtual | ~QAccessibleValueInterface() |
| virtual QVariant | currentValue() const = 0 |
| virtual QVariant | maximumValue() const = 0 |
| virtual QVariant | minimumStepSize() const = 0 |
| virtual QVariant | minimumValue() const = 0 |
| virtual void | setCurrentValue(const QVariant &value) = 0 |
详细描述
The QAccessibleValueInterface class implements support for objects that manipulate a value.
This interface should be implemented by accessible objects that represent a value. Examples are spinner, slider, dial and scroll bar.
Instead of forcing the user to deal with the individual parts of the widgets, this interface gives an easier approach to the kind of widget it represents.
Usually this interface is implemented by classes that also implement QAccessibleInterface.
成员函数
[virtual] QAccessibleValueInterface::~QAccessibleValueInterface()
Destroys the QAccessibleValueInterface.
[pure virtual] QVariant QAccessibleValueInterface::currentValue() const
Returns the current value of the widget. This is usually a double or int.
参见 setCurrentValue().
[pure virtual] QVariant QAccessibleValueInterface::maximumValue() const
Returns the maximum value this object accepts.
参见 minimumValue() and currentValue().
[pure virtual] QVariant QAccessibleValueInterface::minimumStepSize() const
Returns the minimum step size for the accessible. This is the smalles increment that makes sense when changing the value. When programatically changing the value it should always be a multiple of the minimum step size.
Some tools use this value even when the setCurrentValue does not perform any action. Progress bars for example are read-only but should return their range divided by 100.
[pure virtual] QVariant QAccessibleValueInterface::minimumValue() const
Returns the minimum value this object accepts.
参见 maximumValue() and currentValue().
[pure virtual] void QAccessibleValueInterface::setCurrentValue(const QVariant &value)
Sets the value. If the desired value is out of the range of permissible values, this call will be ignored.
参见 currentValue(), minimumValue(), and maximumValue().