ComponentHost

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

All Implemented Interfaces:

DisappearingHost

Direct Known Subclasses:

LithoView
```
public class ComponentHost
extends Host
implements DisappearingHost
```
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.

Field Summary

Fields
Modifier and Type Field and Description

static java.lang.String PARTIAL_ALPHA_TEXTURE_TOO_BIG

static java.lang.String TEXTURE_TOO_BIG

static java.lang.String TEXTURE_ZERO_DIM

Fields
Modifier and Type	Field and Description
`static java.lang.String`	`PARTIAL_ALPHA_TEXTURE_TOO_BIG`
`static java.lang.String`	`TEXTURE_TOO_BIG`
`static java.lang.String`	`TEXTURE_ZERO_DIM`

Constructor Summary

Constructors
Constructor and Description

ComponentHost(Context context)

ComponentHost(Context context, AttributeSet attrs)

Constructors
Constructor and Description
`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()`
`boolean`	`finaliseDisappearingItem(MountItem disappearingItem)` In this method we finally remove the mountItem from the drawing pass.
`protected int`	`getChildDrawingOrder(int childCount, int i)`
`boolean`	`getClipChildren()`
`com.facebook.litho.ComponentTouchListener`	`getComponentTouchListener()`
`java.lang.CharSequence`	`getContentDescription()`
`java.util.List<java.lang.CharSequence>`	`getContentDescriptions()`
`java.util.List<java.lang.String>`	`getContentNames()`
`java.util.List<Drawable>`	`getDrawables()`
`ImageContent`	`getImageContent()`
`protected java.util.Map<java.lang.String,java.lang.Object>`	`getLayoutErrorMetadata(int width, int height)`
`java.util.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()`
`java.lang.Object`	`getTag(int key)`
`TextContent`	`getTextContent()`
`boolean`	`hasOverlappingRendering()`
`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`	`requestLayout()`
`void`	`setAccessibilityDelegate(View.AccessibilityDelegate accessibilityDelegate)`
`void`	`setAlpha(float alpha)`
`void`	`setClipChildren(boolean clipChildren)`
`void`	`setContentDescription(java.lang.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`	`setInLayout()`
`void`	`setTag(int key, java.lang.Object tag)`
`void`	`setViewTags(<any> viewTags)` Sets view tags on this host.
`void`	`setVisibility(int visibility)`
`boolean`	`shouldDelayChildPressedState()`
`protected boolean`	`shouldRequestLayout()`
`void`	`startDisappearingMountItem(MountItem mountItem)` This method is needed because if the disappearing item ended up being remounted to the root, then the index can be different than the one it was created with.
`void`	`unmount(int index, MountItem mountItem)` Unmounts the given `MountItem` with unique index.
`void`	`unmount(MountItem item)` Unmounts the given `MountItem`
`void`	`unsetInLayout()`
`protected boolean`	`verifyDrawable(Drawable who)`

Methods inherited from class com.facebook.rendercore.Host
getDescriptionOfMountedItems, safelyUnmountAll

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

- Field Detail
  - TEXTURE_TOO_BIG
```
public static final java.lang.String TEXTURE_TOO_BIG
```
    See Also:
    
    Constant Field Values
  - TEXTURE_ZERO_DIM
```
public static final java.lang.String TEXTURE_ZERO_DIM
```
    See Also:
    
    Constant Field Values
  - PARTIAL_ALPHA_TEXTURE_TOO_BIG
```
public static final java.lang.String PARTIAL_ALPHA_TEXTURE_TOO_BIG
```
    See Also:
    
    Constant Field Values
- Constructor Detail
  - ComponentHost
```
public ComponentHost(Context context)
```
  - ComponentHost
```
public ComponentHost(Context 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.
  - startDisappearingMountItem
```
public void startDisappearingMountItem(MountItem mountItem)
```
    This method is needed because if the disappearing item ended up being remounted to the root, then the index can be different than the one it was created with.
    
    Specified by:
    
    startDisappearingMountItem in interface DisappearingHost
    
    Parameters:
    
    mountItem -
  - finaliseDisappearingItem
```
public boolean finaliseDisappearingItem(MountItem disappearingItem)
```
    Description copied from interface: DisappearingHost
    
    In this method we finally remove the mountItem from the drawing pass.
    
    Specified by:
    
    finaliseDisappearingItem in interface DisappearingHost
    
    Returns:
    
    true iff the item was removed 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 java.util.List<Drawable> getDrawables()
```
    Returns:
    
    list of drawables that are mounted on this host.
  - getContentNames
```
public java.util.List<java.lang.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 java.lang.CharSequence getContentDescription()
```
    Returns:
    
    the content descriptons that are set on content mounted on this host
  - setContentDescription
```
public void setContentDescription(java.lang.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,
                   java.lang.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.
  - 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)
```
  - getComponentTouchListener
```
public com.facebook.litho.ComponentTouchListener getComponentTouchListener()
```
    Returns:
    
    The previous set touch listener.
  - dispatchHoverEvent
```
public boolean dispatchHoverEvent(MotionEvent event)
```
  - getContentDescriptions
```
public java.util.List<java.lang.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 java.lang.Object getTag(int key)
```
  - refreshAccessibilityDelegatesIfNeeded
```
protected void refreshAccessibilityDelegatesIfNeeded(boolean isAccessibilityEnabled)
```
  - setAccessibilityDelegate
```
public void setAccessibilityDelegate(View.AccessibilityDelegate accessibilityDelegate)
```
  - setClipChildren
```
public void setClipChildren(boolean clipChildren)
```
    Overrides:
    
    setClipChildren in class Host
  - getClipChildren
```
public boolean getClipChildren()
```
    Overrides:
    
    getClipChildren in class Host
  - 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 java.util.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)
```
  - hasOverlappingRendering
```
public boolean hasOverlappingRendering()
```
  - getLayoutErrorMetadata
```
protected java.util.Map<java.lang.String,java.lang.Object> getLayoutErrorMetadata(int width,
                                                                                  int height)
```
  - setAlpha
```
public void setAlpha(float alpha)
```
  - setInLayout
```
public void setInLayout()
```
    Overrides:
    
    setInLayout in class Host
  - unsetInLayout
```
public void unsetInLayout()
```
    Overrides:
    
    unsetInLayout in class Host

Class ComponentHost

Field Summary

Constructor Summary

Method Summary

Methods inherited from class com.facebook.rendercore.Host

Methods inherited from class java.lang.Object

Field Detail

TEXTURE_TOO_BIG

TEXTURE_ZERO_DIM

PARTIAL_ALPHA_TEXTURE_TOO_BIG

Constructor Detail

ComponentHost

ComponentHost

Method Detail

mount

mount

unmount

unmount

startDisappearingMountItem

finaliseDisappearingItem

getMountItemCount

getMountItemAt

getDrawables

getContentNames

getTextContent

getImageContent

getContentDescription

setContentDescription

setTag

moveItem

setViewTags

onInterceptTouchEvent

getComponentTouchListener

dispatchHoverEvent

getContentDescriptions

dispatchDraw

getChildDrawingOrder

shouldDelayChildPressedState

onTouchEvent

onLayout

requestLayout

shouldRequestLayout

verifyDrawable

drawableStateChanged

jumpDrawablesToCurrentState

setVisibility

getTag

refreshAccessibilityDelegatesIfNeeded

setAccessibilityDelegate

setClipChildren

getClipChildren

addView

addView

addView

addViewInLayout

attachViewToParent

removeView

removeViewInLayout

removeViewsInLayout

removeViewAt

removeViews

removeAllViewsInLayout

removeDetachedView

addViewForTest

getLinkedDrawablesForAnimation

performAccessibilityAction

hasOverlappingRendering

getLayoutErrorMetadata

setAlpha

setInLayout

unsetInLayout