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Make KeyboardAvoidingView with behavior="height" resize on keyboard close #18889

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WaldoJeffers wants to merge 5 commits into from
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Make KeyboardAvoidingView with behavior="height" resize on keyboard close #18889

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f35af0b
Save initial frame height & reuse it
WaldoJeffers Apr 16, 2018
7202b50
Merge branch 'master' of https://github.com/facebook/react-native
WaldoJeffers Aug 18, 2018
12384ae
Fix frame reference
WaldoJeffers Aug 18, 2018
e9dae83
Fix onLayout definition
WaldoJeffers Aug 18, 2018
708a789
Fix flow type
WaldoJeffers Aug 18, 2018
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41 changes: 12 additions & 29 deletions Libraries/Components/Keyboard/KeyboardAvoidingView.js
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Original file line number Diff line number Diff line change
Expand Up @@ -29,7 +29,6 @@ type Props = $ReadOnly<{|
* Specify how to react to the presence of the keyboard.
*/
behavior?: ?('height' | 'position' | 'padding'),

/**
* Style of the content container when `behavior` is 'position'.
*/
Expand Down Expand Up @@ -66,6 +65,7 @@ class KeyboardAvoidingView extends React.Component<Props, State> {

_frame: ?ViewLayout = null;
_subscriptions: Array<EmitterSubscription> = [];
_initialFrameHeight: number = 0;

state = {
bottom: 0,
Expand Down Expand Up @@ -111,19 +111,11 @@ class KeyboardAvoidingView extends React.Component<Props, State> {

_onLayout = (event: ViewLayoutEvent) => {
this._frame = event.nativeEvent.layout;
};

UNSAFE_componentWillUpdate(nextProps: Props, nextState: State): void {
if (
nextState.bottom === this.state.bottom &&
this.props.behavior === 'height' &&
nextProps.behavior === 'height'
) {
// If the component rerenders without an internal state change, e.g.
// triggered by parent component re-rendering, no need for bottom to change.
nextState.bottom = 0;
if (!this._initialFrameHeight) {
// save the initial frame height, before the keyboard is visible
this._initialFrameHeight = this._frame.height;
}
}
};

componentDidMount(): void {
if (Platform.OS === 'ios') {
Expand Down Expand Up @@ -158,23 +150,20 @@ class KeyboardAvoidingView extends React.Component<Props, State> {
switch (behavior) {
case 'height':
let heightStyle;
if (this._frame != null) {
if (this._frame != null && this.state.bottom > 0) {
// Note that we only apply a height change when there is keyboard present,
// i.e. this.state.bottom is greater than 0. If we remove that condition,
// this.frame.height will never go back to its original value.
// When height changes, we need to disable flex.
heightStyle = {
height: this._frame.height - bottomHeight,
height: this._initialFrameHeight - bottomHeight,
flex: 0,
};
}
return (
<View
ref={viewRef}
style={StyleSheet.compose(
style,
heightStyle,
)}
style={StyleSheet.compose(style, heightStyle)}
onLayout={this._onLayout}
{...props}>
{children}
Expand All @@ -189,12 +178,9 @@ class KeyboardAvoidingView extends React.Component<Props, State> {
onLayout={this._onLayout}
{...props}>
<View
style={StyleSheet.compose(
contentContainerStyle,
{
bottom: bottomHeight,
},
)}>
style={StyleSheet.compose(contentContainerStyle, {
bottom: bottomHeight,
})}>
{children}
</View>
</View>
Expand All @@ -204,10 +190,7 @@ class KeyboardAvoidingView extends React.Component<Props, State> {
return (
<View
ref={viewRef}
style={StyleSheet.compose(
style,
{paddingBottom: bottomHeight},
)}
style={StyleSheet.compose(style, {paddingBottom: bottomHeight})}
onLayout={this._onLayout}
{...props}>
{children}
Expand Down