程序包 ohos.agp.components

接口 ComponentParent

所有已知实现类:

AdaptiveBoxLayout, ComponentContainer, DatePicker, DependentLayout, DirectionalLayout, EventBadge, FlexLayout, ListComponent, ListContainer, MagicLayout, NestedScrollCoordinator, NestedScrollView, PageFlipper, PageSlider, Picker, PositionLayout, RadioContainer, ScrollView, SearchBar, SlideDrawer, StackLayout, TableLayout, TabList, TimePicker

public interface ComponentParent

Defines features of a parent component.

This class provides interfaces for a component to interact with its parent component.

从以下版本开始:

3

方法概要

限定符和类型	方法	说明
int	getChildIndex(Component component)	Queries the position of a child component.
ComponentParent	getComponentParent()	Obtains the parent component of a child component.
void	moveChildToFront(Component component)	Adjusts the z-order of a child component to top the component over all child components.
boolean	onDrag(Component component, DragEvent event)	Checks if a drag event is distributed to the parent component.
void	postLayout()	Requests the parent component to rearrange its layout.
void	removeComponent(Component component)	Removes a child component from the parent component.
void	removeComponentAt(int index)	Removes the component from a specified position in the component list.
void	removeComponents(int start, int count)	Removes all components from specified positions in a component list.
ComponentContainer.LayoutConfig	verifyLayoutConfig(ComponentContainer.LayoutConfig config)	Verifies layout parameters based on the current layout type.

方法详细资料

postLayout

void postLayout()

Requests the parent component to rearrange its layout.

从以下版本开始:

4

getChildIndex

int getChildIndex(Component component)

Queries the position of a child component.

参数:

component - Indicates the child component to query.

返回:

Returns a positive integer, which represents the position of the child component in the parent component; returns -1 if the child component is not included in the parent component.

从以下版本开始:

4

removeComponent

void removeComponent(Component component)

Removes a child component from the parent component.

参数:

component - Indicates the child component to remove.

removeComponentAt

void removeComponentAt(int index)

Removes the component from a specified position in the component list.

参数:

index - Indicates the position index of the component to remove.

removeComponents

void removeComponents(int start,
                      int count)

Removes all components from specified positions in a component list.

参数:

start - Indicates the position index of the first removed component.

count - Indicates the quantity of components to remove.

verifyLayoutConfig

ComponentContainer.LayoutConfig verifyLayoutConfig(ComponentContainer.LayoutConfig config)

Verifies layout parameters based on the current layout type.

参数:

config - Indicates a group of layout parameters to be converted into a ComponentContainer instance.

返回:

Returns the LayoutConfig instance, which represents the layout parameters.

getComponentParent

ComponentParent getComponentParent()

Obtains the parent component of a child component.

返回:

Returns the parent component of the child component.

moveChildToFront

void moveChildToFront(Component component)

Adjusts the z-order of a child component to top the component over all child components.

An order-dependent layout is changed by the z-order adjustment.

参数:

component - Indicates the child component to be moved on the top of all child components.

从以下版本开始:

4

onDrag

boolean onDrag(Component component,
               DragEvent event)

Checks if a drag event is distributed to the parent component.

参数:

component - Indicates the component that receives the drag event.

event - Indicates the DragEvent object.

返回:

Returns true if the drag event has been processed by the parent component; returns false otherwise.