Merge branch 'development' into feature/not-enough-eth

11 files changed, 339 insertions, 119 deletions

diff --git a/packages/instant/src/components/amount_input.tsx b/packages/instant/src/components/amount_input.tsx
deleted file mode 100644
index c89fb05ad..000000000
--- a/packages/instant/src/components/amount_input.tsx
+++ /dev/null
@@ -1,49 +0,0 @@
-import { BigNumber } from '@0x/utils';
-import * as _ from 'lodash';
-import * as React from 'react';
-
-import { ColorOption } from '../style/theme';
-import { util } from '../util/util';
-
-import { Container, Input } from './ui';
-
-export interface AmountInputProps {
-    fontColor?: ColorOption;
-    fontSize?: string;
-    value?: BigNumber;
-    onChange: (value?: BigNumber) => void;
-}
-
-export class AmountInput extends React.Component<AmountInputProps> {
-    public static defaultProps = {
-        onChange: util.boundNoop,
-    };
-    public render(): React.ReactNode {
-        const { fontColor, fontSize, value } = this.props;
-        return (
-            <Container borderBottom="1px solid rgba(255,255,255,0.3)" display="inline-block">
-                <Input
-                    fontColor={fontColor}
-                    fontSize={fontSize}
-                    onChange={this._handleChange}
-                    value={!_.isUndefined(value) ? value.toString() : ''}
-                    placeholder="0.00"
-                    width="2.2em"
-                />
-            </Container>
-        );
-    }
-    private readonly _handleChange = (event: React.ChangeEvent<HTMLInputElement>): void => {
-        const value = event.target.value;
-        let bigNumberValue;
-        if (!_.isEmpty(value)) {
-            try {
-                bigNumberValue = new BigNumber(event.target.value);
-            } catch {
-                // We don't want to allow values that can't be a BigNumber, so don't even call onChange.
-                return;
-            }
-        }
-        this.props.onChange(bigNumberValue);
-    };
-}
diff --git a/packages/instant/src/components/animations/slide_animations.tsx b/packages/instant/src/components/animations/slide_animations.tsx
index 1f10a2ed6..84280372b 100644
--- a/packages/instant/src/components/animations/slide_animations.tsx
+++ b/packages/instant/src/components/animations/slide_animations.tsx
@@ -1,6 +1,7 @@
 import * as React from 'react';
+import { Keyframes } from 'styled-components';
 
-import { keyframes, styled } from '../../style/theme';
+import { css, keyframes, styled } from '../../style/theme';
 
 const slideKeyframeGenerator = (fromY: string, toY: string) => keyframes`
     from {
@@ -15,7 +16,7 @@ const slideKeyframeGenerator = (fromY: string, toY: string) => keyframes`
 `;
 
 export interface SlideAnimationProps {
-    keyframes: string;
+    keyframes: Keyframes;
     animationType: string;
     animationDirection?: string;
 }
@@ -24,7 +25,10 @@ export const SlideAnimation =
     styled.div <
     SlideAnimationProps >
     `
-    animation-name: ${props => props.keyframes};
+    animation-name: ${props =>
+        css`
+            ${props.keyframes};
+        `};
     animation-duration: 0.3s;
     animation-timing-function: ${props => props.animationType};
     animation-delay: 0s;
diff --git a/packages/instant/src/components/asset_amount_input.tsx b/packages/instant/src/components/asset_amount_input.tsx
deleted file mode 100644
index c03ef1cf3..000000000
--- a/packages/instant/src/components/asset_amount_input.tsx
+++ /dev/null
@@ -1,39 +0,0 @@
-import { BigNumber } from '@0x/utils';
-import * as _ from 'lodash';
-import * as React from 'react';
-
-import { ColorOption } from '../style/theme';
-import { ERC20Asset } from '../types';
-import { assetUtils } from '../util/asset';
-import { util } from '../util/util';
-
-import { AmountInput, AmountInputProps } from './amount_input';
-import { Container, Text } from './ui';
-
-// Asset amounts only apply to ERC20 assets
-export interface AssetAmountInputProps extends AmountInputProps {
-    asset?: ERC20Asset;
-    onChange: (value?: BigNumber, asset?: ERC20Asset) => void;
-}
-
-export class AssetAmountInput extends React.Component<AssetAmountInputProps> {
-    public static defaultProps = {
-        onChange: util.boundNoop,
-    };
-    public render(): React.ReactNode {
-        const { asset, onChange, ...rest } = this.props;
-        return (
-            <Container>
-                <AmountInput {...rest} onChange={this._handleChange} />
-                <Container display="inline-block" marginLeft="10px">
-                    <Text fontSize={rest.fontSize} fontColor={ColorOption.white} textTransform="uppercase">
-                        {assetUtils.bestNameForAsset(asset)}
-                    </Text>
-                </Container>
-            </Container>
-        );
-    }
-    private readonly _handleChange = (value?: BigNumber): void => {
-        this.props.onChange(value, this.props.asset);
-    };
-}
diff --git a/packages/instant/src/components/erc20_asset_amount_input.tsx b/packages/instant/src/components/erc20_asset_amount_input.tsx
new file mode 100644
index 000000000..583fad28b
--- /dev/null
+++ b/packages/instant/src/components/erc20_asset_amount_input.tsx
@@ -0,0 +1,84 @@
+import * as _ from 'lodash';
+import * as React from 'react';
+
+import { ColorOption, transparentWhite } from '../style/theme';
+import { ERC20Asset } from '../types';
+import { assetUtils } from '../util/asset';
+import { BigNumberInput } from '../util/big_number_input';
+import { util } from '../util/util';
+
+import { ScalingAmountInput } from './scaling_amount_input';
+import { Container, Text } from './ui';
+
+// Asset amounts only apply to ERC20 assets
+export interface ERC20AssetAmountInputProps {
+    asset?: ERC20Asset;
+    value?: BigNumberInput;
+    onChange: (value?: BigNumberInput, asset?: ERC20Asset) => void;
+    startingFontSizePx: number;
+    fontColor?: ColorOption;
+}
+
+export interface ERC20AssetAmountInputState {
+    currentFontSizePx: number;
+}
+
+export class ERC20AssetAmountInput extends React.Component<ERC20AssetAmountInputProps, ERC20AssetAmountInputState> {
+    public static defaultProps = {
+        onChange: util.boundNoop,
+    };
+    constructor(props: ERC20AssetAmountInputProps) {
+        super(props);
+        this.state = {
+            currentFontSizePx: props.startingFontSizePx,
+        };
+    }
+    public render(): React.ReactNode {
+        const { asset, onChange, ...rest } = this.props;
+        return (
+            <Container whiteSpace="nowrap">
+                <Container borderBottom={`1px solid ${transparentWhite}`} display="inline-block">
+                    <ScalingAmountInput
+                        {...rest}
+                        textLengthThreshold={this._textLengthThresholdForAsset(asset)}
+                        maxFontSizePx={this.props.startingFontSizePx}
+                        onChange={this._handleChange}
+                        onFontSizeChange={this._handleFontSizeChange}
+                    />
+                </Container>
+                <Container display="inline-flex" marginLeft="10px" title={assetUtils.bestNameForAsset(asset)}>
+                    <Text
+                        fontSize={`${this.state.currentFontSizePx}px`}
+                        fontColor={ColorOption.white}
+                        textTransform="uppercase"
+                    >
+                        {assetUtils.formattedSymbolForAsset(asset)}
+                    </Text>
+                </Container>
+            </Container>
+        );
+    }
+    private readonly _handleChange = (value?: BigNumberInput): void => {
+        this.props.onChange(value, this.props.asset);
+    };
+    private readonly _handleFontSizeChange = (fontSizePx: number): void => {
+        this.setState({
+            currentFontSizePx: fontSizePx,
+        });
+    };
+    // For assets with symbols of different length,
+    // start scaling the input at different character lengths
+    private readonly _textLengthThresholdForAsset = (asset?: ERC20Asset): number => {
+        if (_.isUndefined(asset)) {
+            return 3;
+        }
+        const symbol = asset.metaData.symbol;
+        if (symbol.length <= 3) {
+            return 5;
+        }
+        if (symbol.length === 5) {
+            return 3;
+        }
+        return 4;
+    };
+}
diff --git a/packages/instant/src/components/instant_heading.tsx b/packages/instant/src/components/instant_heading.tsx
index 17ac65429..1ef276ff3 100644
--- a/packages/instant/src/components/instant_heading.tsx
+++ b/packages/instant/src/components/instant_heading.tsx
@@ -2,7 +2,7 @@ import { BigNumber } from '@0x/utils';
 import * as _ from 'lodash';
 import * as React from 'react';
 
-import { SelectedAssetAmountInput } from '../containers/selected_asset_amount_input';
+import { SelectedERC20AssetAmountInput } from '../containers/selected_erc20_asset_amount_input';
 import { ColorOption } from '../style/theme';
 import { AsyncProcessState, OrderProcessState, OrderState } from '../types';
 import { format } from '../util/format';
@@ -48,7 +48,9 @@ export class InstantHeading extends React.Component<InstantHeadingProps, {}> {
                     </Text>
                 </Container>
                 <Flex direction="row" justify="space-between">
-                    <SelectedAssetAmountInput fontSize="45px" />
+                    <Flex height="60px">
+                        <SelectedERC20AssetAmountInput startingFontSizePx={38} />
+                    </Flex>
                     <Flex direction="column" justify="space-between">
                         {iconOrAmounts}
                     </Flex>
diff --git a/packages/instant/src/components/scaling_amount_input.tsx b/packages/instant/src/components/scaling_amount_input.tsx
new file mode 100644
index 000000000..655ae2b74
--- /dev/null
+++ b/packages/instant/src/components/scaling_amount_input.tsx
@@ -0,0 +1,52 @@
+import * as _ from 'lodash';
+import * as React from 'react';
+
+import { ColorOption } from '../style/theme';
+import { BigNumberInput } from '../util/big_number_input';
+import { util } from '../util/util';
+
+import { ScalingInput } from './scaling_input';
+
+export interface ScalingAmountInputProps {
+    maxFontSizePx: number;
+    textLengthThreshold: number;
+    fontColor?: ColorOption;
+    value?: BigNumberInput;
+    onChange: (value?: BigNumberInput) => void;
+    onFontSizeChange: (fontSizePx: number) => void;
+}
+
+export class ScalingAmountInput extends React.Component<ScalingAmountInputProps> {
+    public static defaultProps = {
+        onChange: util.boundNoop,
+        onFontSizeChange: util.boundNoop,
+    };
+    public render(): React.ReactNode {
+        const { textLengthThreshold, fontColor, maxFontSizePx, value, onFontSizeChange } = this.props;
+        return (
+            <ScalingInput
+                maxFontSizePx={maxFontSizePx}
+                textLengthThreshold={textLengthThreshold}
+                onFontSizeChange={onFontSizeChange}
+                fontColor={fontColor}
+                onChange={this._handleChange}
+                value={!_.isUndefined(value) ? value.toDisplayString() : ''}
+                placeholder="0.00"
+                emptyInputWidthCh={3.5}
+            />
+        );
+    }
+    private readonly _handleChange = (event: React.ChangeEvent<HTMLInputElement>): void => {
+        const value = event.target.value;
+        let bigNumberValue;
+        if (!_.isEmpty(value)) {
+            try {
+                bigNumberValue = new BigNumberInput(value);
+            } catch {
+                // We don't want to allow values that can't be a BigNumber, so don't even call onChange.
+                return;
+            }
+        }
+        this.props.onChange(bigNumberValue);
+    };
+}
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;
+    };
+}
diff --git a/packages/instant/src/components/ui/container.tsx b/packages/instant/src/components/ui/container.tsx
index 5e2218c68..76b570de7 100644
--- a/packages/instant/src/components/ui/container.tsx
+++ b/packages/instant/src/components/ui/container.tsx
@@ -1,5 +1,3 @@
-import * as React from 'react';
-
 import { ColorOption, styled } from '../../style/theme';
 import { cssRuleIfExists } from '../../style/util';
 
@@ -11,6 +9,7 @@ export interface ContainerProps {
     bottom?: string;
     left?: string;
     width?: string;
+    height?: string;
     maxWidth?: string;
     margin?: string;
     marginTop?: string;
@@ -27,14 +26,14 @@ export interface ContainerProps {
     backgroundColor?: ColorOption;
     hasBoxShadow?: boolean;
     zIndex?: number;
+    whiteSpace?: string;
     opacity?: number;
 }
 
-const PlainContainer: React.StatelessComponent<ContainerProps> = ({ children, className }) => (
-    <div className={className}>{children}</div>
-);
-
-export const Container = styled(PlainContainer)`
+export const Container =
+    styled.div <
+    ContainerProps >
+    `
     box-sizing: border-box;
     ${props => cssRuleIfExists(props, 'display')}
     ${props => cssRuleIfExists(props, 'position')}
@@ -43,6 +42,7 @@ export const Container = styled(PlainContainer)`
     ${props => cssRuleIfExists(props, 'bottom')}
     ${props => cssRuleIfExists(props, 'left')}
     ${props => cssRuleIfExists(props, 'width')}
+    ${props => cssRuleIfExists(props, 'height')}
     ${props => cssRuleIfExists(props, 'max-width')}
     ${props => cssRuleIfExists(props, 'margin')}
     ${props => cssRuleIfExists(props, 'margin-top')}
@@ -55,6 +55,7 @@ export const Container = styled(PlainContainer)`
     ${props => cssRuleIfExists(props, 'border-top')}
     ${props => cssRuleIfExists(props, 'border-bottom')}
     ${props => cssRuleIfExists(props, 'z-index')}
+    ${props => cssRuleIfExists(props, 'white-space')}
     ${props => cssRuleIfExists(props, 'opacity')}
     ${props => (props.hasBoxShadow ? `box-shadow: 0px 2px 10px rgba(0, 0, 0, 0.1)` : '')};
     background-color: ${props => (props.backgroundColor ? props.theme[props.backgroundColor] : 'none')};
diff --git a/packages/instant/src/components/ui/flex.tsx b/packages/instant/src/components/ui/flex.tsx
index 327e91926..5fa3fc95b 100644
--- a/packages/instant/src/components/ui/flex.tsx
+++ b/packages/instant/src/components/ui/flex.tsx
@@ -1,5 +1,3 @@
-import * as React from 'react';
-
 import { ColorOption, styled } from '../../style/theme';
 import { cssRuleIfExists } from '../../style/util';
 
@@ -9,21 +7,22 @@ export interface FlexProps {
     justify?: 'flex-start' | 'center' | 'space-around' | 'space-between' | 'space-evenly' | 'flex-end';
     align?: 'flex-start' | 'center' | 'space-around' | 'space-between' | 'space-evenly' | 'flex-end';
     width?: string;
+    height?: string;
     backgroundColor?: ColorOption;
     className?: string;
 }
 
-const PlainFlex: React.StatelessComponent<FlexProps> = ({ children, className }) => (
-    <div className={className}>{children}</div>
-);
-
-export const Flex = styled(PlainFlex)`
+export const Flex =
+    styled.div <
+    FlexProps >
+    `
     display: flex;
     flex-direction: ${props => props.direction};
     flex-wrap: ${props => props.flexWrap};
     justify-content: ${props => props.justify};
     align-items: ${props => props.align};
     ${props => cssRuleIfExists(props, 'width')}
+    ${props => cssRuleIfExists(props, 'height')}
     background-color: ${props => (props.backgroundColor ? props.theme[props.backgroundColor] : 'none')};
 `;
 
diff --git a/packages/instant/src/components/ui/input.tsx b/packages/instant/src/components/ui/input.tsx
index f8c6b6ef6..a884ff7cb 100644
--- a/packages/instant/src/components/ui/input.tsx
+++ b/packages/instant/src/components/ui/input.tsx
@@ -12,11 +12,10 @@ export interface InputProps {
     onChange?: (event: React.ChangeEvent<HTMLInputElement>) => void;
 }
 
-const PlainInput: React.StatelessComponent<InputProps> = ({ value, className, placeholder, onChange }) => (
-    <input className={className} value={value} onChange={onChange} placeholder={placeholder} />
-);
-
-export const Input = styled(PlainInput)`
+export const Input =
+    styled.input <
+    InputProps >
+    `
     font-size: ${props => props.fontSize};
     width: ${props => props.width};
     padding: 0.1em 0em;
diff --git a/packages/instant/src/components/ui/text.tsx b/packages/instant/src/components/ui/text.tsx
index 9fb8ea26f..fd72f6cc8 100644
--- a/packages/instant/src/components/ui/text.tsx
+++ b/packages/instant/src/components/ui/text.tsx
@@ -23,14 +23,11 @@ export interface TextProps {
     display?: string;
 }
 
-const PlainText: React.StatelessComponent<TextProps> = ({ children, className, onClick }) => (
-    <div className={className} onClick={onClick}>
-        {children}
-    </div>
-);
-
 const darkenOnHoverAmount = 0.3;
-export const Text = styled(PlainText)`
+export const Text =
+    styled.div <
+    TextProps >
+    `
     font-family: ${props => props.fontFamily};
     font-style: ${props => props.fontStyle};
     font-weight: ${props => props.fontWeight};