ComponentHost

java.lang.Object
- ViewGroup
- - com.facebook.rendercore.Host
  - - com.facebook.litho.ComponentHost

Direct Known Subclasses:

Host
```
public class ComponentHost
extends Host
```
A ViewGroup that can host the mounted state of a Component. This is used by MountState to wrap mounted drawables to handle click events and update drawable states accordingly.

Constructor Summary

Constructors
Constructor and Description
`ComponentHost(ComponentContext context, AttributeSet attrs)`
`ComponentHost(Context context)`
`ComponentHost(Context context, AttributeSet attrs)`

Method Summary

All Methods Instance Methods Concrete Methods Deprecated Methods
Modifier and Type	Method and Description
`void`	`addView(View child)` Deprecated.
`void`	`addView(View child, int index)` Deprecated.
`void`	`addView(View child, int index, ViewGroup.LayoutParams params)` Deprecated.
`void`	`addViewForTest(View view)` Manually adds a View as a child of this ComponentHost for the purposes of testing.
`protected boolean`	`addViewInLayout(View child, int index, ViewGroup.LayoutParams params, boolean preventRequestLayout)` Deprecated.
`protected void`	`attachViewToParent(View child, int index, ViewGroup.LayoutParams params)` Deprecated.
`void`	`dispatchDraw(Canvas canvas)`
`boolean`	`dispatchHoverEvent(MotionEvent event)`
`protected void`	`drawableStateChanged()`
`protected int`	`getChildDrawingOrder(int childCount, int i)`
`boolean`	`getClipChildren()`
`com.facebook.litho.ComponentTouchListener`	`getComponentTouchListener()`
`CharSequence`	`getContentDescription()`
`List<CharSequence>`	`getContentDescriptions()`
`List<String>`	`getContentNames()`
`List<Drawable>`	`getDrawables()`
`ImageContent`	`getImageContent()`
`List<Drawable>`	`getLinkedDrawablesForAnimation()` Returns the Drawables associated with this ComponentHost for animations, for example the background Drawable and/or the drawable that otherwise has a transitionKey on it that has caused it to be hosted in this ComponentHost.
`MountItem`	`getMountItemAt(int index)`
`int`	`getMountItemCount()`
`Object`	`getTag()`
`Object`	`getTag(int key)`
`TextContent`	`getTextContent()`
`void`	`jumpDrawablesToCurrentState()`
`void`	`mount(int index, MountItem mountItem)` Mounts the given `MountItem` with unique index.
`void`	`mount(int index, MountItem mountItem, Rect bounds)` Mounts the given `MountItem` with unique index.
`void`	`moveItem(MountItem item, int oldIndex, int newIndex)` Moves the MountItem associated to oldIndex in the newIndex position.
`boolean`	`onInterceptTouchEvent(MotionEvent ev)`
`protected void`	`onLayout(boolean changed, int l, int t, int r, int b)`
`boolean`	`onTouchEvent(MotionEvent event)`
`boolean`	`performAccessibilityAction(int action, Bundle arguments)`
`protected void`	`refreshAccessibilityDelegatesIfNeeded(boolean isAccessibilityEnabled)`
`void`	`removeAllViewsInLayout()` Deprecated.
`protected void`	`removeDetachedView(View child, boolean animate)` Deprecated.
`void`	`removeView(View view)` Deprecated.
`void`	`removeViewAt(int index)` Deprecated.
`void`	`removeViewInLayout(View view)` Deprecated.
`void`	`removeViews(int start, int count)` Deprecated.
`void`	`removeViewsInLayout(int start, int count)` Deprecated.
`void`	`requestDisallowInterceptTouchEvent(boolean disallowIntercept)`
`void`	`requestLayout()`
`void`	`setAccessibilityDelegate(View.AccessibilityDelegate accessibilityDelegate)`
`void`	`setClipChildren(boolean clipChildren)`
`void`	`setContentDescription(CharSequence contentDescription)` Host views implement their own content description handling instead of just delegating to the underlying view framework for performance reasons as the framework sets/resets content description very frequently on host views and the underlying accessibility notifications might cause performance issues.
`void`	`setTag(int key, Object tag)`
`void`	`setViewTag(Object viewTag)` Sets view tag on this host.
`void`	`setViewTags(<any> viewTags)` Sets view tags on this host.
`void`	`setVisibility(int visibility)`
`boolean`	`shouldDelayChildPressedState()`
`protected boolean`	`shouldRequestLayout()`
`void`	`unmount(int index, MountItem mountItem)` Unmounts the given `MountItem` with unique index.
`void`	`unmount(MountItem item)` Unmounts the given `MountItem`
`protected boolean`	`verifyDrawable(Drawable who)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - ComponentHost
```
public ComponentHost(Context context)
```
  - ComponentHost
```
public ComponentHost(Context context,
                     AttributeSet attrs)
```
  - ComponentHost
```
public ComponentHost(ComponentContext context,
                     AttributeSet attrs)
```
- Method Detail
  - mount
```
public void mount(int index,
                  MountItem mountItem)
```
    Description copied from class: Host
    
    Mounts the given MountItem with unique index.
    
    Specified by:
    
    mount in class Host
    
    Parameters:
    
    index - index of the MountItem. Guaranteed to be the same index as is passed for the corresponding unmount(index, mountItem) call.
    
    mountItem - item to be mounted into the host.
  - mount
```
public void mount(int index,
                  MountItem mountItem,
                  Rect bounds)
```
    Mounts the given MountItem with unique index.
    
    Parameters:
    
    index - index of the MountItem. Guaranteed to be the same index as is passed for the corresponding unmount(index, mountItem) call.
    
    mountItem - item to be mounted into the host.
    
    bounds - the bounds of the item that is to be mounted into the host
  - unmount
```
public void unmount(MountItem item)
```
    Description copied from class: Host
    
    Unmounts the given MountItem
    
    Specified by:
    
    unmount in class Host
    
    Parameters:
    
    item - item to be unmounted from the host.
  - unmount
```
public void unmount(int index,
                    MountItem mountItem)
```
    Unmounts the given MountItem with unique index.
    
    Specified by:
    
    unmount in class Host
    
    Parameters:
    
    index - index of the MountItem. Guaranteed to be the same index as was passed for the corresponding mount(index, mountItem) call.
    
    mountItem - item to be unmounted from the host.
  - getMountItemCount
```
public int getMountItemCount()
```
    Specified by:
    
    getMountItemCount in class Host
    
    Returns:
    
    number of MountItems that are currently mounted in the host.
  - getMountItemAt
```
public MountItem getMountItemAt(int index)
```
    Specified by:
    
    getMountItemAt in class Host
    
    Returns:
    
    the MountItem that was mounted with the given index.
  - getDrawables
```
public List<Drawable> getDrawables()
```
    Returns:
    
    list of drawables that are mounted on this host.
  - getContentNames
```
public List<String> getContentNames()
```
    Returns:
    
    list of names of content mounted on this host.
  - getTextContent
```
public TextContent getTextContent()
```
    Returns:
    
    the text content that is mounted on this host.
  - getImageContent
```
public ImageContent getImageContent()
```
    Returns:
    
    the image content that is mounted on this host.
  - getContentDescription
```
public CharSequence getContentDescription()
```
    Returns:
    
    the content descriptons that are set on content mounted on this host
  - setContentDescription
```
public void setContentDescription(CharSequence contentDescription)
```
    Host views implement their own content description handling instead of just delegating to the underlying view framework for performance reasons as the framework sets/resets content description very frequently on host views and the underlying accessibility notifications might cause performance issues. This is safe to do because the framework owns the accessibility state and knows how to update it efficiently.
  - setTag
```
public void setTag(int key,
                   Object tag)
```
  - moveItem
```
public void moveItem(MountItem item,
                     int oldIndex,
                     int newIndex)
```
    Moves the MountItem associated to oldIndex in the newIndex position. This happens when a LithoView needs to re-arrange the internal order of its items. If an item is already present in newIndex the item is guaranteed to be either unmounted or moved to a different index by subsequent calls to either unmount(int, MountItem) or moveItem(MountItem, int, int).
    
    Specified by:
    
    moveItem in class Host
    
    Parameters:
    
    item - The item that has been moved.
    
    oldIndex - The current index of the MountItem.
    
    newIndex - The new index of the MountItem.
  - setViewTag
```
public void setViewTag(Object viewTag)
```
    Sets view tag on this host.
    
    Parameters:
    
    viewTag - the object to set as tag.
  - setViewTags
```
public void setViewTags(<any> viewTags)
```
    Sets view tags on this host.
    
    Parameters:
    
    viewTags - the map containing the tags by id.
  - onInterceptTouchEvent
```
public boolean onInterceptTouchEvent(MotionEvent ev)
```
  - requestDisallowInterceptTouchEvent
```
public void requestDisallowInterceptTouchEvent(boolean disallowIntercept)
```
  - getComponentTouchListener
```
public com.facebook.litho.ComponentTouchListener getComponentTouchListener()
```
    Returns:
    
    The previous set touch listener.
  - dispatchHoverEvent
```
public boolean dispatchHoverEvent(MotionEvent event)
```
  - getContentDescriptions
```
public List<CharSequence> getContentDescriptions()
```
  - dispatchDraw
```
public void dispatchDraw(Canvas canvas)
```
  - getChildDrawingOrder
```
protected int getChildDrawingOrder(int childCount,
                                   int i)
```
  - shouldDelayChildPressedState
```
public boolean shouldDelayChildPressedState()
```
  - onTouchEvent
```
public boolean onTouchEvent(MotionEvent event)
```
  - onLayout
```
protected final void onLayout(boolean changed,
                              int l,
                              int t,
                              int r,
                              int b)
```
  - requestLayout
```
public void requestLayout()
```
  - shouldRequestLayout
```
protected boolean shouldRequestLayout()
```
  - verifyDrawable
```
protected boolean verifyDrawable(Drawable who)
```
  - drawableStateChanged
```
protected void drawableStateChanged()
```
  - jumpDrawablesToCurrentState
```
public void jumpDrawablesToCurrentState()
```
  - setVisibility
```
public void setVisibility(int visibility)
```
  - getTag
```
public Object getTag()
```
  - getTag
```
public Object getTag(int key)
```
  - refreshAccessibilityDelegatesIfNeeded
```
protected void refreshAccessibilityDelegatesIfNeeded(boolean isAccessibilityEnabled)
```
  - setAccessibilityDelegate
```
public void setAccessibilityDelegate(View.AccessibilityDelegate accessibilityDelegate)
```
  - setClipChildren
```
public void setClipChildren(boolean clipChildren)
```
  - getClipChildren
```
public boolean getClipChildren()
```
  - addView
```
@Deprecated
public void addView(View child)
```
    Deprecated.
    
    Litho handles adding/removing views automatically using mount/unmount calls. Manually adding/ removing views will mess up Litho's bookkeeping of added views and cause weird crashes down the line.
  - addView
```
@Deprecated
public void addView(View child,
                                int index)
```
    Deprecated.
    
    Litho handles adding/removing views automatically using mount/unmount calls. Manually adding/ removing views will mess up Litho's bookkeeping of added views and cause weird crashes down the line.
  - addView
```
@Deprecated
public void addView(View child,
                                int index,
                                ViewGroup.LayoutParams params)
```
    Deprecated.
    
    Litho handles adding/removing views automatically using mount/unmount calls. Manually adding/ removing views will mess up Litho's bookkeeping of added views and cause weird crashes down the line.
  - addViewInLayout
```
@Deprecated
protected boolean addViewInLayout(View child,
                                              int index,
                                              ViewGroup.LayoutParams params,
                                              boolean preventRequestLayout)
```
    Deprecated.
    
    Litho handles adding/removing views automatically using mount/unmount calls. Manually adding/ removing views will mess up Litho's bookkeeping of added views and cause weird crashes down the line.
  - attachViewToParent
```
@Deprecated
protected void attachViewToParent(View child,
                                              int index,
                                              ViewGroup.LayoutParams params)
```
    Deprecated.
    
    Litho handles adding/removing views automatically using mount/unmount calls. Manually adding/ removing views will mess up Litho's bookkeeping of added views and cause weird crashes down the line.
  - removeView
```
@Deprecated
public void removeView(View view)
```
    Deprecated.
    
    Litho handles adding/removing views automatically using mount/unmount calls. Manually adding/ removing views will mess up Litho's bookkeeping of added views and cause weird crashes down the line.
  - removeViewInLayout
```
@Deprecated
public void removeViewInLayout(View view)
```
    Deprecated.
    
    Litho handles adding/removing views automatically using mount/unmount calls. Manually adding/ removing views will mess up Litho's bookkeeping of added views and cause weird crashes down the line.
  - removeViewsInLayout
```
@Deprecated
public void removeViewsInLayout(int start,
                                            int count)
```
    Deprecated.
    
    Litho handles adding/removing views automatically using mount/unmount calls. Manually adding/ removing views will mess up Litho's bookkeeping of added views and cause weird crashes down the line.
  - removeViewAt
```
@Deprecated
public void removeViewAt(int index)
```
    Deprecated.
    
    Litho handles adding/removing views automatically using mount/unmount calls. Manually adding/ removing views will mess up Litho's bookkeeping of added views and cause weird crashes down the line.
  - removeViews
```
@Deprecated
public void removeViews(int start,
                                    int count)
```
    Deprecated.
    
    Litho handles adding/removing views automatically using mount/unmount calls. Manually adding/ removing views will mess up Litho's bookkeeping of added views and cause weird crashes down the line.
  - removeAllViewsInLayout
```
@Deprecated
public void removeAllViewsInLayout()
```
    Deprecated.
    
    Litho handles adding/removing views automatically using mount/unmount calls. Manually adding/ removing views will mess up Litho's bookkeeping of added views and cause weird crashes down the line.
  - removeDetachedView
```
@Deprecated
protected void removeDetachedView(View child,
                                              boolean animate)
```
    Deprecated.
    
    Litho handles adding/removing views automatically using mount/unmount calls. Manually adding/ removing views will mess up Litho's bookkeeping of added views and cause weird crashes down the line.
  - addViewForTest
```
public void addViewForTest(View view)
```
    Manually adds a View as a child of this ComponentHost for the purposes of testing. **This should only be used for tests as this is not safe and will likely cause weird crashes if used in a production environment**.
  - getLinkedDrawablesForAnimation
```
public List<Drawable> getLinkedDrawablesForAnimation()
```
    Returns the Drawables associated with this ComponentHost for animations, for example the background Drawable and/or the drawable that otherwise has a transitionKey on it that has caused it to be hosted in this ComponentHost.
    The core purpose of exposing these drawables is so that when animating the bounds of this ComponentHost, we also properly animate the bounds of its contained Drawables at the same time.
  - performAccessibilityAction
```
public boolean performAccessibilityAction(int action,
                                          Bundle arguments)
```

Class ComponentHost

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

ComponentHost

ComponentHost

ComponentHost

Method Detail

mount

mount

unmount

unmount

getMountItemCount

getMountItemAt

getDrawables

getContentNames

getTextContent

getImageContent

getContentDescription

setContentDescription

setTag

moveItem

setViewTag

setViewTags

onInterceptTouchEvent

requestDisallowInterceptTouchEvent

getComponentTouchListener

dispatchHoverEvent

getContentDescriptions

dispatchDraw

getChildDrawingOrder

shouldDelayChildPressedState

onTouchEvent

onLayout

requestLayout

shouldRequestLayout

verifyDrawable

drawableStateChanged

jumpDrawablesToCurrentState

setVisibility

getTag

getTag

refreshAccessibilityDelegatesIfNeeded

setAccessibilityDelegate

setClipChildren

getClipChildren

addView

addView

addView

addViewInLayout

attachViewToParent

removeView

removeViewInLayout

removeViewsInLayout

removeViewAt

removeViews

removeAllViewsInLayout

removeDetachedView

addViewForTest

getLinkedDrawablesForAnimation

performAccessibilityAction