diff options
author | fragosti <francesco.agosti93@gmail.com> | 2018-10-27 02:41:09 +0800 |
---|---|---|
committer | fragosti <francesco.agosti93@gmail.com> | 2018-10-27 02:41:09 +0800 |
commit | a414dc9b83c14b277af90ce8397db3736a51a4d3 (patch) | |
tree | e9814de850892932b539c88e1798d44b00db563a /packages/instant/src/components/scaling_input.tsx | |
parent | 951a5271e15cebb010281de3b8cbfb3972ecec83 (diff) | |
parent | 0f6307169604f36b0316f236eb96d6001b788f50 (diff) | |
download | dexon-sol-tools-a414dc9b83c14b277af90ce8397db3736a51a4d3.tar dexon-sol-tools-a414dc9b83c14b277af90ce8397db3736a51a4d3.tar.gz dexon-sol-tools-a414dc9b83c14b277af90ce8397db3736a51a4d3.tar.bz2 dexon-sol-tools-a414dc9b83c14b277af90ce8397db3736a51a4d3.tar.lz dexon-sol-tools-a414dc9b83c14b277af90ce8397db3736a51a4d3.tar.xz dexon-sol-tools-a414dc9b83c14b277af90ce8397db3736a51a4d3.tar.zst dexon-sol-tools-a414dc9b83c14b277af90ce8397db3736a51a4d3.zip |
Merge branch 'development' of https://github.com/0xProject/0x-monorepo into feature/instant/fixed-orders-in-render-method
Diffstat (limited to 'packages/instant/src/components/scaling_input.tsx')
-rw-r--r-- | packages/instant/src/components/scaling_input.tsx | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/packages/instant/src/components/scaling_input.tsx b/packages/instant/src/components/scaling_input.tsx new file mode 100644 index 000000000..34cb0b5fd --- /dev/null +++ b/packages/instant/src/components/scaling_input.tsx @@ -0,0 +1,170 @@ +import * as _ from 'lodash'; +import * as React from 'react'; + +import { ColorOption } from '../style/theme'; +import { util } from '../util/util'; + +import { Input } from './ui'; + +export enum ScalingInputPhase { + FixedFontSize, + ScalingFontSize, +} + +export interface ScalingSettings { + percentageToReduceFontSizePerCharacter: number; + constantPxToIncreaseWidthPerCharacter: number; +} + +export interface ScalingInputProps { + textLengthThreshold: number; + maxFontSizePx: number; + value: string; + emptyInputWidthCh: number; + onChange: (event: React.ChangeEvent<HTMLInputElement>) => void; + onFontSizeChange: (fontSizePx: number) => void; + fontColor?: ColorOption; + placeholder?: string; + maxLength?: number; + scalingSettings: ScalingSettings; +} + +export interface ScalingInputState { + inputWidthPxAtPhaseChange?: number; +} + +export interface ScalingInputSnapshot { + inputWidthPx: number; +} + +// These are magic numbers that were determined experimentally. +const defaultScalingSettings: ScalingSettings = { + percentageToReduceFontSizePerCharacter: 0.125, + constantPxToIncreaseWidthPerCharacter: 4, +}; + +export class ScalingInput extends React.Component<ScalingInputProps, ScalingInputState> { + public static defaultProps = { + onChange: util.boundNoop, + onFontSizeChange: util.boundNoop, + maxLength: 7, + scalingSettings: defaultScalingSettings, + }; + public state: ScalingInputState = { + inputWidthPxAtPhaseChange: undefined, + }; + private readonly _inputRef = React.createRef<HTMLInputElement>(); + public static getPhase(textLengthThreshold: number, value: string): ScalingInputPhase { + if (value.length <= textLengthThreshold) { + return ScalingInputPhase.FixedFontSize; + } + return ScalingInputPhase.ScalingFontSize; + } + public static getPhaseFromProps(props: ScalingInputProps): ScalingInputPhase { + const { value, textLengthThreshold } = props; + return ScalingInput.getPhase(textLengthThreshold, value); + } + public static calculateFontSize( + textLengthThreshold: number, + maxFontSizePx: number, + phase: ScalingInputPhase, + value: string, + percentageToReduceFontSizePerCharacter: number, + ): number { + if (phase !== ScalingInputPhase.ScalingFontSize) { + return maxFontSizePx; + } + const charactersOverMax = value.length - textLengthThreshold; + const scalingFactor = (1 - percentageToReduceFontSizePerCharacter) ** charactersOverMax; + const fontSize = scalingFactor * maxFontSizePx; + return fontSize; + } + public static calculateFontSizeFromProps(props: ScalingInputProps, phase: ScalingInputPhase): number { + const { textLengthThreshold, value, maxFontSizePx, scalingSettings } = props; + return ScalingInput.calculateFontSize( + textLengthThreshold, + maxFontSizePx, + phase, + value, + scalingSettings.percentageToReduceFontSizePerCharacter, + ); + } + public getSnapshotBeforeUpdate(): ScalingInputSnapshot { + return { + inputWidthPx: this._getInputWidthInPx(), + }; + } + public componentDidUpdate( + prevProps: ScalingInputProps, + prevState: ScalingInputState, + snapshot: ScalingInputSnapshot, + ): void { + const prevPhase = ScalingInput.getPhaseFromProps(prevProps); + const curPhase = ScalingInput.getPhaseFromProps(this.props); + // if we went from fixed to scaling, save the width from the transition + if (prevPhase !== ScalingInputPhase.ScalingFontSize && curPhase === ScalingInputPhase.ScalingFontSize) { + this.setState({ + inputWidthPxAtPhaseChange: snapshot.inputWidthPx, + }); + } + // if we went from scaling to fixed, revert back to scaling using `ch` + if (prevPhase === ScalingInputPhase.ScalingFontSize && curPhase !== ScalingInputPhase.ScalingFontSize) { + this.setState({ + inputWidthPxAtPhaseChange: undefined, + }); + } + const prevFontSize = ScalingInput.calculateFontSizeFromProps(prevProps, prevPhase); + const curFontSize = ScalingInput.calculateFontSizeFromProps(this.props, curPhase); + // If font size has changed, notify. + if (prevFontSize !== curFontSize) { + this.props.onFontSizeChange(curFontSize); + } + } + public render(): React.ReactNode { + const { fontColor, onChange, placeholder, value, maxLength } = this.props; + const phase = ScalingInput.getPhaseFromProps(this.props); + return ( + <Input + ref={this._inputRef as any} + fontColor={fontColor} + onChange={onChange} + value={value} + placeholder={placeholder} + fontSize={`${this._calculateFontSize(phase)}px`} + width={this._calculateWidth(phase)} + maxLength={maxLength} + /> + ); + } + private readonly _calculateWidth = (phase: ScalingInputPhase): string => { + const { value, textLengthThreshold, scalingSettings } = this.props; + if (_.isEmpty(value)) { + return `${this.props.emptyInputWidthCh}ch`; + } + switch (phase) { + case ScalingInputPhase.FixedFontSize: + return `${value.length}ch`; + case ScalingInputPhase.ScalingFontSize: + const { inputWidthPxAtPhaseChange } = this.state; + if (!_.isUndefined(inputWidthPxAtPhaseChange)) { + const charactersOverMax = value.length - textLengthThreshold; + const scalingAmount = scalingSettings.constantPxToIncreaseWidthPerCharacter * charactersOverMax; + const width = inputWidthPxAtPhaseChange + scalingAmount; + return `${width}px`; + } + return `${textLengthThreshold}ch`; + default: + return '1ch'; + } + }; + private readonly _calculateFontSize = (phase: ScalingInputPhase): number => { + return ScalingInput.calculateFontSizeFromProps(this.props, phase); + }; + private readonly _getInputWidthInPx = (): number => { + const ref = this._inputRef.current; + if (!ref) { + return 0; + } + return ref.getBoundingClientRect().width; + }; +} |