QAbstractSlider ¶

概要 ¶

详细描述 ¶

此类被设计作为 Widget 的通用超类像 QScrollBar , QSlider and QDial .

这里是类的主要特性：

1. value : The bounded integer that QAbstractSlider maintains.

2. minimum : The lowest possible value.

3. maximum : The highest possible value.

4. singleStep : The smaller of two natural steps that an abstract sliders provides and typically corresponds to the user pressing an arrow key.

5. pageStep : The larger of two natural steps that an abstract slider provides and typically corresponds to the user pressing PageUp or PageDown.

6. tracking : Whether slider tracking is enabled.

7. sliderPosition : The current position of the slider. If tracking is enabled (the default), this is identical to value .

Unity (1) may be viewed as a third step size. setValue() lets you set the current value to any integer in the allowed range, not just minimum() + n * singleStep() for integer values of n . Some widgets may allow the user to set any value at all; others may just provide multiples of singleStep() or pageStep() .

QAbstractSlider emits a comprehensive set of signals:

信号	Emitted when
valueChanged()	the value has changed. The tracking determines whether this signal is emitted during user interaction.
sliderPressed()	the user starts to drag the slider.
sliderMoved()	the user drags the slider.
sliderReleased()	the user releases the slider.
actionTriggered()	a slider action was triggerd.
rangeChanged()	a the range has changed.

QAbstractSlider provides a virtual sliderChange() function that is well suited for updating the on-screen representation of sliders. By calling triggerAction() , subclasses trigger slider actions. Two helper functions sliderPositionFromValue() and sliderValueFromPosition() help subclasses and styles to map screen coordinates to logical range values.

另请参阅

QAbstractSpinBox QSlider QDial QScrollBar 滑块范例

class QAbstractSlider ( [ parent=None ] ) ¶

param parent

QWidget

构造抽象滑块。

parent 自变量被发送给 QWidget 构造函数。

minimum 默认为 0， maximum 到 99，采用 singleStep 1 尺寸和 pageStep 10 尺寸，及初始 value of 0.

PySide2.QtWidgets.QAbstractSlider. SliderAction ¶

常量	描述
QAbstractSlider.SliderNoAction
QAbstractSlider.SliderSingleStepAdd
QAbstractSlider.SliderSingleStepSub
QAbstractSlider.SliderPageStepAdd
QAbstractSlider.SliderPageStepSub
QAbstractSlider.SliderToMinimum
QAbstractSlider.SliderToMaximum
QAbstractSlider.SliderMove

PySide2.QtWidgets.QAbstractSlider. SliderChange ¶

常量	描述
QAbstractSlider.SliderRangeChange
QAbstractSlider.SliderOrientationChange
QAbstractSlider.SliderStepsChange
QAbstractSlider.SliderValueChange

PySide2.QtWidgets.QAbstractSlider. actionTriggered ( action ) ¶

参数

action – int

PySide2.QtWidgets.QAbstractSlider. hasTracking ( ) ¶

返回类型

bool

PySide2.QtWidgets.QAbstractSlider. invertedAppearance ( ) ¶

返回类型

bool

另请参阅

setInvertedAppearance()

PySide2.QtWidgets.QAbstractSlider. invertedControls ( ) ¶

返回类型

bool

另请参阅

setInvertedControls()

PySide2.QtWidgets.QAbstractSlider. isSliderDown ( ) ¶

返回类型

bool

PySide2.QtWidgets.QAbstractSlider. maximum ( ) ¶

返回类型

int

另请参阅

setMaximum()

PySide2.QtWidgets.QAbstractSlider. minimum ( ) ¶

返回类型

int

另请参阅

setMinimum()

PySide2.QtWidgets.QAbstractSlider. orientation ( ) ¶

返回类型

取向

另请参阅

setOrientation()

PySide2.QtWidgets.QAbstractSlider. pageStep ( ) ¶

返回类型

int

另请参阅

setPageStep()

PySide2.QtWidgets.QAbstractSlider. rangeChanged ( min , max ) ¶

参数

• min – int

• max – int

PySide2.QtWidgets.QAbstractSlider. repeatAction ( ) ¶

返回类型

SliderAction

返回当前的重复动作。

另请参阅

setRepeatAction()

PySide2.QtWidgets.QAbstractSlider. setInvertedAppearance ( arg__1 ) ¶

参数

arg__1 – bool

另请参阅

invertedAppearance()

PySide2.QtWidgets.QAbstractSlider. setInvertedControls ( arg__1 ) ¶

参数

arg__1 – bool

另请参阅

invertedControls()

PySide2.QtWidgets.QAbstractSlider. setMaximum ( arg__1 ) ¶

参数

arg__1 – int

另请参阅

maximum()

PySide2.QtWidgets.QAbstractSlider. setMinimum ( arg__1 ) ¶

参数

arg__1 – int

另请参阅

minimum()

PySide2.QtWidgets.QAbstractSlider. setOrientation ( arg__1 ) ¶

参数

arg__1 – 取向

另请参阅

orientation()

PySide2.QtWidgets.QAbstractSlider. setPageStep ( arg__1 ) ¶

参数

arg__1 – int

另请参阅

pageStep()

PySide2.QtWidgets.QAbstractSlider. setRange ( min , max ) ¶

参数

• min – int

• max – int

Sets the slider’s minimum to min and its maximum to max .

若 max 小于 min , min 变为唯一合法值。

另请参阅

minimum maximum

PySide2.QtWidgets.QAbstractSlider. setRepeatAction ( action [ , thresholdTime=500 [ , repeatTime=50 ] ] ) ¶

参数

• action – SliderAction

• thresholdTime – int

• repeatTime – int

设置动作 action to be triggered repetitively in intervals of repeatTime , after an initial delay of thresholdTime .

另请参阅

triggerAction() repeatAction()

PySide2.QtWidgets.QAbstractSlider. setSingleStep ( arg__1 ) ¶

参数

arg__1 – int

另请参阅

singleStep()

PySide2.QtWidgets.QAbstractSlider. setSliderDown ( arg__1 ) ¶

参数

arg__1 – bool

另请参阅

isSliderDown()

PySide2.QtWidgets.QAbstractSlider. setSliderPosition ( arg__1 ) ¶

参数

arg__1 – int

另请参阅

sliderPosition()

PySide2.QtWidgets.QAbstractSlider. setTracking ( enable ) ¶

参数

enable – bool

另请参阅

hasTracking()

PySide2.QtWidgets.QAbstractSlider. setValue ( arg__1 ) ¶

参数

arg__1 – int

另请参阅

value()

PySide2.QtWidgets.QAbstractSlider. singleStep ( ) ¶

返回类型

int

另请参阅

setSingleStep()

PySide2.QtWidgets.QAbstractSlider. sliderChange ( change ) ¶

参数

change – SliderChange

Reimplement this virtual function to track slider changes such as SliderRangeChange , SliderOrientationChange , SliderStepsChange ，或 SliderValueChange . The default implementation only updates the display and ignores the change 参数。

PySide2.QtWidgets.QAbstractSlider. sliderMoved ( position ) ¶

参数

position – int

PySide2.QtWidgets.QAbstractSlider. sliderPosition ( ) ¶

返回类型

int

另请参阅

setSliderPosition()

PySide2.QtWidgets.QAbstractSlider. sliderPressed ( ) ¶

PySide2.QtWidgets.QAbstractSlider. sliderReleased ( ) ¶

PySide2.QtWidgets.QAbstractSlider. triggerAction ( action ) ¶

参数

action – SliderAction

触发滑块 action 。可能的动作是 SliderSingleStepAdd , SliderSingleStepSub , SliderPageStepAdd , SliderPageStepSub , SliderToMinimum , SliderToMaximum ，和 SliderMove .

另请参阅

actionTriggered()

PySide2.QtWidgets.QAbstractSlider. value ( ) ¶

返回类型

int

另请参阅

setValue()

PySide2.QtWidgets.QAbstractSlider. valueChanged ( value ) ¶

参数

value – int