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authorfragosti <francesco.agosti93@gmail.com>2018-10-20 05:58:12 +0800
committerfragosti <francesco.agosti93@gmail.com>2018-10-20 05:58:12 +0800
commit6510454337dd5add86522c0eb5621a3f55ac062d (patch)
treef39590b92220411575a207f23ca1e6a845eef1d4
parentf06541ec94c2f3b8d1924da376178a5fc3f442e6 (diff)
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feat: add scaling input component
-rw-r--r--packages/instant/src/components/amount_input.tsx10
-rw-r--r--packages/instant/src/components/scaling_input.tsx82
2 files changed, 88 insertions, 4 deletions
diff --git a/packages/instant/src/components/amount_input.tsx b/packages/instant/src/components/amount_input.tsx
index c89fb05ad..f6f562be8 100644
--- a/packages/instant/src/components/amount_input.tsx
+++ b/packages/instant/src/components/amount_input.tsx
@@ -5,7 +5,8 @@ import * as React from 'react';
import { ColorOption } from '../style/theme';
import { util } from '../util/util';
-import { Container, Input } from './ui';
+import { ScalingInput } from './scaling_input';
+import { Container, Text } from './ui';
export interface AmountInputProps {
fontColor?: ColorOption;
@@ -22,13 +23,14 @@ export class AmountInput extends React.Component<AmountInputProps> {
const { fontColor, fontSize, value } = this.props;
return (
<Container borderBottom="1px solid rgba(255,255,255,0.3)" display="inline-block">
- <Input
+ <ScalingInput
+ startWidthCh={3.5}
+ endWidthCh={6}
+ startFontSizePx={45}
fontColor={fontColor}
- fontSize={fontSize}
onChange={this._handleChange}
value={!_.isUndefined(value) ? value.toString() : ''}
placeholder="0.00"
- width="2.2em"
/>
</Container>
);
diff --git a/packages/instant/src/components/scaling_input.tsx b/packages/instant/src/components/scaling_input.tsx
new file mode 100644
index 000000000..ea0a925d2
--- /dev/null
+++ b/packages/instant/src/components/scaling_input.tsx
@@ -0,0 +1,82 @@
+import { BigNumber } from '@0x/utils';
+import * as _ from 'lodash';
+import * as React from 'react';
+import * as ReactDOM from 'react-dom';
+
+import { ColorOption } from '../style/theme';
+import { util } from '../util/util';
+
+import { Container, Input } from './ui';
+
+export enum ScalingInputPhase {
+ Start,
+ Scaling,
+ End,
+}
+
+export interface ScalingInputProps {
+ startWidthCh: number;
+ endWidthCh: number;
+ startFontSizePx: number;
+ value?: string;
+ onChange?: (event: React.ChangeEvent<HTMLInputElement>) => void;
+ fontColor?: ColorOption;
+ placeholder?: string;
+}
+// Magic value obtained via trial-and-error
+const scalingRateToMaintainSameWidth = 0.1;
+export class ScalingInput extends React.Component<ScalingInputProps> {
+ public static defaultProps = {
+ onChange: util.boundNoop,
+ };
+ public render(): React.ReactNode {
+ const { fontColor, onChange, placeholder, value } = this.props;
+ const phase = this._getPhase();
+ return (
+ <Input
+ fontColor={fontColor}
+ onChange={onChange}
+ value={value}
+ placeholder={placeholder}
+ fontSize={this._calculateFontSize(phase)}
+ width={this._calculateWidth(phase)}
+ />
+ );
+ }
+ private readonly _calculateFontSize = (phase: ScalingInputPhase): string => {
+ const { value, endWidthCh, startFontSizePx } = this.props;
+ if (_.isUndefined(value) || phase !== ScalingInputPhase.End) {
+ return `${startFontSizePx}px`;
+ }
+ const charactersOverMax = value.length - endWidthCh;
+ const pixelsToReduceFontSizeBy = charactersOverMax * 2;
+ const newFontSizePx = startFontSizePx - pixelsToReduceFontSizeBy;
+ return `${newFontSizePx}px`;
+ };
+ private readonly _calculateWidth = (phase: ScalingInputPhase): string => {
+ const { value, startWidthCh, endWidthCh } = this.props;
+ if (_.isUndefined(value)) {
+ return `${startWidthCh}ch`;
+ }
+ switch (phase) {
+ case ScalingInputPhase.Start:
+ return `${startWidthCh}ch`;
+ case ScalingInputPhase.Scaling:
+ return `${value.length}ch`;
+ case ScalingInputPhase.End:
+ return `${endWidthCh}ch`;
+ default:
+ return `${startWidthCh}ch`;
+ }
+ };
+ private readonly _getPhase = (): ScalingInputPhase => {
+ const { value, startWidthCh, endWidthCh } = this.props;
+ if (_.isUndefined(value) || value.length <= this.props.startWidthCh) {
+ return ScalingInputPhase.Start;
+ }
+ if (value.length > startWidthCh && value.length <= endWidthCh) {
+ return ScalingInputPhase.Scaling;
+ }
+ return ScalingInputPhase.End;
+ };
+}