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https://github.com/cesardeazevedo/react-native-collapsing-toolbar

react-native wrapper for android CollapsingToolbarLayout
https://github.com/cesardeazevedo/react-native-collapsing-toolbar

android appbar collapsing collapsingtoolbarlayout coordinatorlayout parallax react-native

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react-native wrapper for android CollapsingToolbarLayout

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# react-native-collapsing-toolbar



react-native wrapper for [CollapsingToolbarLayout](https://developer.android.com/reference/android/support/design/widget/CollapsingToolbarLayout.html),

easy to integrate with Animated.Event and FlatList out the box.



![collapsing-github](https://cloud.githubusercontent.com/assets/5366959/26673566/b68a1a1e-4693-11e7-9a7b-41227dde0ff3.gif)



[See the example](https://github.com/cesardeazevedo/react-native-collapsing-toolbar/blob/master/example/index.android.js)



## Getting started



Make sure to install both `react-native-collapsing-toolbar` and `react-native-nested-scroll-view`.



`$ npm install react-native-nested-scroll-view --save`

`$ npm install react-native-collapsing-toolbar --save`



### Installation



MainActivity.java



```diff



+   import com.rnnestedscrollview.RNNestedScrollViewPackage;

+   import com.rncollapsingtoolbar.RNCollapsingToolbarPackage;



    public class MainApplication extends Application implements ReactApplication {



      @Override

      protected List getPackages() {

        return Arrays.asList(

            new MainReactPackage(),

+           new RNCollapsingToolbarPackage(),

+           new RNNestedScrollViewPackage()

        );

      }

    }



```



android/app/build.gradle



```diff

    dependencies {

        implementation fileTree(dir: "libs", include: ["*.jar"])

        implementation "com.android.support:appcompat-v7:${rootProject.ext.supportLibVersion}"

        implementation "com.facebook.react:react-native:+"  // From node_modules

+       implementation project(':react-native-collapsing-toolbar')

+       implementation project(':react-native-nested-scroll-view')

    }



```



android/settings.gradle



```diff



include ':app'



+   include ':react-native-nested-scroll-view'

+   project(':react-native-nested-scroll-view').projectDir = new File(rootProject.projectDir, '../node_modules/react-native-nested-scroll-view/android')



+   include ':react-native-collapsing-toolbar'

+   project(':react-native-collapsing-toolbar').projectDir = new File(rootProject.projectDir, '../node_modules/react-native-collapsing-toolbar/android')



```



# Usage



This package depends of [react-native-nested-scroll-view](https://github.com/cesardeazevedo/react-native-nested-scroll-view).



**Note** This component is very easy to break, you should follows this exact component order to make it work.



```jsx



import {

  AppBarLayout,

  CoordinatorLayout,

  CollapsingToolbarLayout,

  CollapsingParallax,

} from 'react-native-collapsing-toolbar'



import NestedScrollView from 'react-native-nested-scroll-view'



render() {

  const HEADER_HEIGHT = 300

  return (

    

      

        

          

            

              Some Custom Text Inside the Parallax

            

          

          

        

      

      

      // Main Content

      

    

  )

}



```



## Usage with FlatList



To work with FlatList, you should just pass the `renderScrollComponent` props and render a NestedScrollView instead of the ScrollView.



**NOTE:** RefreshControl is **NOT** supported yet.



```jsx

renderScroll(props) {

  return (

    

  )

}



render() {

  return (

    

      

      ....

      

      

    

  )

}

```



## Usage with Animated.Events



In order to do custom animations when collapsing, you should use `onOffsetChanged` prop on the `AppBarLayout` and **not** `onScroll` from the `NestedScrollView`, the `onScroll` won't fire until the CollapsingToolbarLayout is entire collapsed.



```jsx



state = {

  scrollY: new Animated.Value(0),

};



handleOffsetChanged = (e) => {

  Animated.event(

    [{ nativeEvent: { offset: this.state.scrollY }}]

  )(e, this.state)

}



render() {

  const rotateZ = this.state.scrollY.interpolate({

    inputRange:  [0, 100],

    outputRange: ["0deg", "-50deg"],

  })

  return (

    

      

        

          

          

        

      

      

      

    

  )

}



```



# API



AppBarLayout properties



| Prop                      | Description

|---------------------------|------------

| onOffsetChanged           | The actual scroll event when de toolbar is collasping



AppBarLayout Methods



| Method  | Description

|---------|------------

| show    | Expands the toolbar

| hide    | Collapses the toolbar

| redraw  | Redraw the toolbar (invokes requestLayout)



CollapsingToolbarLayout properties



| Prop                      | Description

|---------------------------|------------

| title                     | Title of the Toolbar

| titleEnable               | If false, it will show the title of the ToolbarAndroid Component

| height                    | Height when the component is expanded, could be set on the style prop

| scrimVisibleHeightTrigger | The trigger value when the animation transition should started

| scrimAnimationDuration    | The duration of the animation transition

| contentScrimColor         | The color of the Toolbar to show when the view is collapsing

| collapsedTitleTextColor   | The color of the title when the view is collapsed.

| collapsedTitleGravity     | The alignment of the title when collpased, can be "CENTER", "CENTER_VERTICAL", "TOP", "LEFT", "RIGHT", "BOTTOM", "START" or "END"

| collapsedTitleTypeface    | Name of the font when the title is collapsed.

| statusBarScrimColor       | The color to use for the status bar scrim, Only works on Lollipop with the correct setup

| expandedTitleColor        | The color of the title when the view is expanded

| expandedTitleMargin       | Object with start, top, end, bottom margins

| expandedTitleMarginStart  | The left margin when title is expanded

| expandedTitleMarginTop    | The top margin when title is expanded

| expandedTitleMarginEnd    | The right margin when title is expanded

| expandedTitleMarginBottom | The bottom margin when title is expanded

| expandedTitleGravity      | The alignment of the title when expanded, can be "CENTER", "CENTER_VERTICAL", "TOP", "LEFT", "RIGHT", "BOTTOM", "START" or "END"

| expandedTitleTypeface     | Name of the font when the title is expanded

| scrollFlags               | Defines the scroll behavior, the values are defined statically on the AppBarLayout, can be SCROLL_FLAG_SNAP, SCROLL_FLAG_SCROLL, SCROLL_FLAG_ENTER_ALWAYS, SCROLL_FLAG_ENTER_ALWAYS, SCROLL_FLAG_EXIT_UNTIL_COLLAPSED, SCROLL_FLAG_ENTER_ALWAYS_COLLAPSED



CollapsingParallax props



| Prop               | Description

|--------------------|------------

| parallaxMultiplier | The multiplier amount of parallax, a value higher than 1, the content will move against the scroll.



# License



[MIT](./LICENSE)