ListLinearLayoutManager

java.lang.Object
- ohos.agp.components.LayoutManager
- - ohos.agp.components.listcomponent.ListLayoutManager
  - - ohos.agp.components.listcomponent.ListLinearLayoutManager

直接已知子类:

ListGridLayoutManager
```
public class ListLinearLayoutManager
extends ListLayoutManager
```
Inherits from ListLayoutManager and implements the linear layout of the ListComponent.

从以下版本开始:

7

字段概要

字段
限定符和类型	字段	说明
`static int`	`HORIZONTAL`	Indicates that the components are arranged horizontally in the `ListComponent`.
`static int`	`INVALID_OFFSET`	Indicates an invalid offset.
`static int`	`VERTICAL`	Indicates that the components are arranged vertically in the `ListComponent`.

构造器概要

构造器
构造器说明

ListLinearLayoutManager()
Default constructor used to create a ListLinearLayoutManager object.

构造器
构造器	说明
`ListLinearLayoutManager()`	Default constructor used to create a `ListLinearLayoutManager` object.

方法概要

所有方法实例方法具体方法
限定符和类型	方法	说明
`protected void`	`createNativePtr()`
`int`	`findFirstCompletelyVisibleComponentPosition()`	Obtains the position of the first completely visible component in the provider.
`int`	`findFirstVisibleComponentPosition()`	Obtains the position of the first visible component in the provider.
`int`	`findLastCompletelyVisibleChildComponentPosition()`	Obtains the position of the last completely visible component in the provider.
`int`	`findLastVisibleChildComponentPosition()`	Obtains the position of the last visible component in the provider.
`int`	`getFirstTimePreloadNum()`	Obtains the number of components to be preloaded.
`int`	`getLayoutOrientation()`	Obtains the layout orientation.
`boolean`	`getLoadFromEnd()`	Checks whether the components need to be loaded from the bottom.
`float`	`getMaxScale()`	Obtains the maximum scale factor.
`float`	`getMinScale()`	Obtains the minimum scale factor.
`boolean`	`getReverseLayoutChild()`	Checks whether the components need to be laid out in the reverse direction.
`float`	`getScaleInterpolator()`	Obtains the interpolator.
`boolean`	`isSmoothScrollbarAllowed()`	Checks whether the smooth scroll bar is enabled.
`void`	`scrollToPositionWithDelta(int position, int delta)`	Scrolls the `ListComponent` to the specified position in the provider based on a given distance.
`void`	`setFirstTimePreloadNum(int itemCount)`	Sets the number of components to be preloaded.
`void`	`setLayoutOrientation(int orientation)`	Sets the layout orientation.
`void`	`setLoadFromEnd(boolean loadFromEnd)`	Sets whether to load the components from the bottom.
`void`	`setMaxScale(float maxScale)`	Sets the maximum scale factor.
`void`	`setMinScale(float minScale)`	Sets the minimum scale factor.
`void`	`setReverseLayoutChild(boolean reverseLayout)`	Sets whether to lay out the components in the reverse direction.
`void`	`setScaleInterpolator(float interpolator)`	Sets an interpolator.
`void`	`setSmoothScrollbarAllowed(boolean enabled)`	Sets whether to enable the smooth scroll bar.

从类继承的方法 ohos.agp.components.listcomponent.ListLayoutManager
allowScrollHorizontally, allowScrollVertically, getOrientation, isPreloadWorkerEnabled, isScrollingSmoothly, setOrientation, setPreloadWorkerEnabled

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- 字段详细资料
  - HORIZONTAL
```
public static final int HORIZONTAL
```
    Indicates that the components are arranged horizontally in the ListComponent.
    
    从以下版本开始:
    
    7
    
    另请参阅:
    
    常量字段值
  - INVALID_OFFSET
```
public static final int INVALID_OFFSET
```
    Indicates an invalid offset.
    
    从以下版本开始:
    
    7
    
    另请参阅:
    
    常量字段值
  - VERTICAL
```
public static final int VERTICAL
```
    Indicates that the components are arranged vertically in the ListComponent.
    
    从以下版本开始:
    
    7
    
    另请参阅:
    
    常量字段值
- 构造器详细资料
  - ListLinearLayoutManager
```
public ListLinearLayoutManager()
```
    Default constructor used to create a ListLinearLayoutManager object.
    
    从以下版本开始:
    
    7
- 方法详细资料
  - createNativePtr
```
protected void createNativePtr()
```
  - setLayoutOrientation
```
public void setLayoutOrientation(int orientation)
```
    Sets the layout orientation.
    The default orientation is Component.VERTICAL.
    
    参数:
    
    orientation - Indicates the layout orientation to set. The value Component.HORIZONTAL means that the components are arranged horizontally, and Component.VERTICAL means that they are arranged horizontally.
    
    从以下版本开始:
    
    7
  - getLayoutOrientation
```
public int getLayoutOrientation()
```
    Obtains the layout orientation.
    
    返回:
    
    Returns Component.HORIZONTAL if the components are arranged horizontally; returns Component.VERTICAL if they are arranged vertically.
    
    从以下版本开始:
    
    7
  - findFirstVisibleComponentPosition
```
public int findFirstVisibleComponentPosition()
```
    Obtains the position of the first visible component in the provider.
    
    返回:
    
    Returns the position if obtained; returns ohos.agp.components.ListComponent#LIST_NO_POSITION if there is no visible component.
    
    从以下版本开始:
    
    7
  - findFirstCompletelyVisibleComponentPosition
```
public int findFirstCompletelyVisibleComponentPosition()
```
    Obtains the position of the first completely visible component in the provider.
    
    返回:
    
    Returns the position if obtained; returns ohos.agp.components.ListComponent#LIST_NO_POSITION if there is no completely visible component.
    
    从以下版本开始:
    
    7
  - findLastVisibleChildComponentPosition
```
public int findLastVisibleChildComponentPosition()
```
    Obtains the position of the last visible component in the provider.
    
    返回:
    
    Returns the position if obtained; returns ohos.agp.components.ListComponent#LIST_NO_POSITION if there is no visible component.
    
    从以下版本开始:
    
    7
  - findLastCompletelyVisibleChildComponentPosition
```
public int findLastCompletelyVisibleChildComponentPosition()
```
    Obtains the position of the last completely visible component in the provider.
    
    返回:
    
    Returns the position if obtained; returns ohos.agp.components.ListComponent#LIST_NO_POSITION if there is no completely visible component.
    
    从以下版本开始:
    
    7
  - scrollToPositionWithDelta
```
public void scrollToPositionWithDelta(int position,
                                      int delta)
```
    Scrolls the ListComponent to the specified position in the provider based on a given distance.
    
    参数:
    
    position - Indicates the position to scroll to.
    
    delta - Indicates the distance (in pixels) between the component's start edge and the start edge of the ListComponent.
    
    从以下版本开始:
    
    7
  - setSmoothScrollbarAllowed
```
public void setSmoothScrollbarAllowed(boolean enabled)
```
    Sets whether to enable the smooth scroll bar.
    When child components in the ListComponent have different height values, the scroll bar height does not change dynamically if the smooth scroll bar is enabled. If the smooth scroll bar is disabled, the scroll bar height changes dynamically with the height of the child components.
    
    参数:
    
    enabled - Specifies whether to enable the smooth scroll bar. The value true means to enable the smooth scroll bar, and false means the opposite.
    
    从以下版本开始:
    
    7
  - isSmoothScrollbarAllowed
```
public boolean isSmoothScrollbarAllowed()
```
    Checks whether the smooth scroll bar is enabled.
    By default, the smooth scroll bar is enabled.
    
    返回:
    
    Returns true if the smooth scroll bar is enabled; returns false otherwise.
    
    从以下版本开始:
    
    7
  - setFirstTimePreloadNum
```
public void setFirstTimePreloadNum(int itemCount)
```
    Sets the number of components to be preloaded.
    
    参数:
    
    itemCount - Indicates the number of components.
    
    从以下版本开始:
    
    7
  - getFirstTimePreloadNum
```
public int getFirstTimePreloadNum()
```
    Obtains the number of components to be preloaded.
    
    返回:
    
    Returns the number of components.
    
    从以下版本开始:
    
    7
  - setLoadFromEnd
```
public void setLoadFromEnd(boolean loadFromEnd)
```
    Sets whether to load the components from the bottom.
    
    参数:
    
    loadFromEnd - Specifies whether to load the components from the bottom. The value true means to load them from the bottom, and false means the opposite.
    
    从以下版本开始:
    
    7
  - getLoadFromEnd
```
public boolean getLoadFromEnd()
```
    Checks whether the components need to be loaded from the bottom.
    
    返回:
    
    Returns true if the components need to be loaded from the bottom; returns false otherwise.
    
    从以下版本开始:
    
    7
  - setReverseLayoutChild
```
public void setReverseLayoutChild(boolean reverseLayout)
```
    Sets whether to lay out the components in the reverse direction.
    
    参数:
    
    reverseLayout - Specifies whether to lay out the components in the reverse direction. The value true means to lay out the components in the reverse direction, and false means the opposite.
    
    从以下版本开始:
    
    7
  - getReverseLayoutChild
```
public boolean getReverseLayoutChild()
```
    Checks whether the components need to be laid out in the reverse direction.
    
    返回:
    
    Returns true if the components need to be laid out in the reverse direction; returns false otherwise.
    
    从以下版本开始:
    
    7
  - setMaxScale
```
public void setMaxScale(float maxScale)
```
    Sets the maximum scale factor.
    
    参数:
    
    maxScale - Indicates the maximum scale factor to set.
    
    从以下版本开始:
    
    7
  - getMaxScale
```
public float getMaxScale()
```
    Obtains the maximum scale factor.
    
    返回:
    
    Returns the maximum scale factor.
    
    从以下版本开始:
    
    7
  - setMinScale
```
public void setMinScale(float minScale)
```
    Sets the minimum scale factor.
    
    参数:
    
    minScale - Indicates the minimum scale factor to set.
    
    从以下版本开始:
    
    7
  - getMinScale
```
public float getMinScale()
```
    Obtains the minimum scale factor.
    
    返回:
    
    Returns the minimum scale factor.
    
    从以下版本开始:
    
    7
  - setScaleInterpolator
```
public void setScaleInterpolator(float interpolator)
```
    Sets an interpolator.
    
    参数:
    
    interpolator - Indicates the interpolator to set.
    
    从以下版本开始:
    
    7
  - getScaleInterpolator
```
public float getScaleInterpolator()
```
    Obtains the interpolator.
    
    返回:
    
    Returns the interpolator.
    
    从以下版本开始:
    
    7

类 ListLinearLayoutManager

字段概要

构造器概要

方法概要

从类继承的方法 ohos.agp.components.listcomponent.ListLayoutManager

从类继承的方法 java.lang.Object

字段详细资料

HORIZONTAL

INVALID_OFFSET

VERTICAL

构造器详细资料

ListLinearLayoutManager

方法详细资料

createNativePtr

setLayoutOrientation

getLayoutOrientation

findFirstVisibleComponentPosition

findFirstCompletelyVisibleComponentPosition

findLastVisibleChildComponentPosition

findLastCompletelyVisibleChildComponentPosition

scrollToPositionWithDelta

setSmoothScrollbarAllowed

isSmoothScrollbarAllowed

setFirstTimePreloadNum

getFirstTimePreloadNum

setLoadFromEnd

getLoadFromEnd

setReverseLayoutChild

getReverseLayoutChild

setMaxScale

getMaxScale

setMinScale

getMinScale

setScaleInterpolator

getScaleInterpolator