iwmlib/lib/pixi/buttongroup.js

/* globals ThrowPropsPlugin, Strong */

import Theme from './theme.js'
import Button from './button.js'
import Events from '../events.js'

/**
 * Class that represents a PixiJS ButtonGroup.
 *
 * @example
 * // Create the button group
 * const buttonGroup = new ButtonGroup({
 *     buttons: [
 *         {label: 'Button 1', action: event => console.log(event)},
 *         {label: 'Button 2', action: event => console.log(event)},
 *         {label: 'Button 3', action: event => console.log(event)}
 *     ],
 *     minWidth: 100
 * })
 *
 * // Add the button group to a DisplayObject
 * app.scene.addChild(buttonGroup)
 *
 * @class
 * @extends PIXI.Graphics
 * @see {@link http://pixijs.download/dev/docs/PIXI.Graphics.html|PIXI.Graphics}
 * @see {@link https://www.iwm-tuebingen.de/iwmbrowser/lib/pixi/buttongroup.html|DocTest}
 */
export default class ButtonGroup extends PIXI.Container {
    /**
     * Creates an instance of a ButtonGroup.
     *
     * @constructor
     * @param {object} [opts] - An options object to specify to style and behaviour of the button group.
     * @param {number} [opts.id=auto generated] - The id of the button group.
     * @param {number} [opts.x=0] - The x position of the button group. Can be also set after creation with buttonGroup.x = 0.
     * @param {number} [opts.y=0] - The y position of the button group. Can be also set after creation with buttonGroup.y = 0.
     * @param {object[]} [opts.buttons=[]] - An array of the buttons of the button group. One item of the array (one object)
     *     can have exactly the same properties as an Button object when instantiating a Button. If a property of the button group
     *     conflicts with a property of a button object, the value from the button object will be used.
     * @param {string|Theme=} [opts.theme=dark] - The theme to use for this button group. Possible values are dark, light, red
     *     or a Theme object.
     * @param {number} [opts.minWidth=44] - Button: The minimum width of one button.
     * @param {number} [opts.minHeight=44] - Button: The minimum height of one button.
     * @param {number} [opts.maxWidth] - The maximum width of the button group. If the buttons are wider than the maximum width, the buttons get stacked. Note: The buttons can only be stacked if margin is not zero. Note 2: Load the Greensock ThrowPropsPlugin for smoother animations.
     * @param {number} [opts.maxHeight] - The maximum height of the button group. If the buttons are higher than the maximum height, the buttons get stacked. Note: The buttons can only be stacked if margin is not zero. Note 2: Load the Greensock ThrowPropsPlugin for smoother animations.
     * @param {number} [opts.stackPadding=10] - The padding for stacked buttons.
     * @param {PIXI.Application} [opts.app] - The PixiJS Application. Must be set if you want to use the mousewheel to scroll your button group. Only used when the buttons are stacked (with maxWidth or maxHeight).
     * @param {number} [opts.padding=Theme.padding] - Button: The inner spacing (distance from icon and/or label) the the border.
     * @param {number} [opts.margin=Theme.margin] - The outer spacing (distance from one button to the previous/next button).
     * @param {string} [opts.iconPosition=left] - Button: The position of the icon in relation to the label. Can be left or right.
     * @param {number} [opts.iconColor=Theme.iconColor] - Button: The color of the icon (set by the tint property) as a hex value.
     * @param {number} [opts.iconColorActive=Theme.iconColorActive] - Button: The color of the icon when activated.
     * @param {number} [opts.fill=Theme.fill] - Button: The color of the button background as a hex value.
     * @param {number} [opts.fillAlpha=Theme.fillAlpha] - Button: The alpha value of the background.
     * @param {number} [opts.fillActive=Theme.fillActive] - Button: The color of the button background when activated.
     * @param {number} [opts.fillActiveAlpha=Theme.fillActiveAlpha] - Button: The alpha value of the background when activated.
     * @param {number} [opts.stroke=Theme.stroke] - Button: The color of the border as a hex value.
     * @param {number} [opts.strokeWidth=Theme.strokeWidth] - Button: The width of the border in pixel.
     * @param {number} [opts.strokeAlpha=Theme.strokeAlpha] - Button: The alpha value of the border.
     * @param {number} [opts.strokeActive=Theme.strokeActive] - Button: The color of the border when activated.
     * @param {number} [opts.strokeActiveWidth=Theme.strokeActiveWidth] - Button: The width of the border in pixel when activated.
     * @param {number} [opts.strokeActiveAlpha=Theme.strokeActiveAlpha] - Button: The alpha value of the border when activated.
     * @param {object} [opts.textStyle=Theme.textStyle] - Button: A textstyle object for the styling of the label. See PIXI.TextStyle
     *     for possible options.
     * @param {number} [opts.textStyleActive=Theme.textStyleActive] - Button: A textstyle object for the styling of the label when the
     *     button is activated. See PIXI.TextStyle for possible options.
     * @param {string} [opts.style=default] - A shortcut for styling options. Possible values are default, link.
     * @param {number} [opts.radius=Theme.radius] - Button: The radius of the four corners of the button (which is a rounded rectangle).
     * @param {boolean} [opts.disabled=false] - Is the button group disabled? When disabled, the button group has a lower alpha value
     *     and cannot be clicked (interactive of every button is set to false).
     * @param {string} [opts.type=default] - The type of the button group. Can be default, checkbox or radio. When the type is
     *     checkbox, the active state is toggled for each button automatically. When the type is radio, only one button can
     *     be activated at the same time.
     * @param {string} [opts.orientation=horizontal] - The orientation of the button group. Can be horizontal or vertical.
     * @param {string} [opts.align=center] - Button: The horizontal position of the label and the icon. Possible values are
     *     left, center and right. Only affects the style when the minWidth is bigger than the width of the icon and label.
     * @param {string} [opts.verticalAlign=middle] - Button: The vertical position of the label and the icon. Possible values are
     *     top, middle and bottom. Only affects the style when the minHeight is bigger than the height of the icon and label.
     * @param {boolean} [opts.visible=true] - Is the button group initially visible (property visible)?
     */
    constructor(opts = {}) {
        super()

        const theme = Theme.fromString(opts.theme)
        this.theme = theme

        this.opts = Object.assign(
            {},
            {
                id: PIXI.utils.uid(),
                x: 0,
                y: 0,
                buttons: [],
                minWidth: 44,
                minHeight: 44,
                maxWidth: null,
                maxHeight: null,
                stackPadding: 10,
                app: null,
                padding: theme.padding,
                margin: theme.margin,
                iconPosition: 'left', // left, right
                iconColor: theme.iconColor,
                iconColorActive: theme.iconColorActive,
                fill: theme.fill,
                fillAlpha: theme.fillAlpha,
                fillActive: theme.fillActive,
                fillActiveAlpha: theme.fillActiveAlpha,
                stroke: theme.stroke,
                strokeWidth: theme.strokeWidth,
                strokeAlpha: theme.strokeAlpha,
                strokeActive: theme.strokeActive,
                strokeActiveWidth: theme.strokeActiveWidth,
                strokeActiveAlpha: theme.strokeActiveAlpha,
                textStyle: theme.textStyle,
                textStyleActive: theme.textStyleActive,
                style: 'default',
                radius: theme.radius,
                disabled: null,
                type: 'default', // default, checkbox, radio
                orientation: 'horizontal',
                align: 'center', // left, center, right
                verticalAlign: 'middle', // top, middle, bottom
                visible: true
            },
            opts
        )

        this.buttons = []

        this._disabled = null
        this.__dragging = false

        this.visible = this.opts.visible

        // setup
        //-----------------
        this.setup()

        // layout
        //-----------------
        this.layout()
    }

    /**
     * Creates children and instantiates everything.
     *
     * @private
     * @return {ButtonGroup} A reference to the button group for chaining.
     */
    setup() {
        // inner container
        //--------------------
        const container = new PIXI.Graphics()
        this.addChild(container)
        this.container = container

        // Buttons
        //-----------------
        let position = 0
        let index = 0

        for (let it of this.opts.buttons) {
            delete it.x
            delete it.y

            if (this.opts.orientation === 'horizontal') {
                it.x = position
            } else {
                it.y = position
            }

            it.theme = it.theme || this.opts.theme
            it.minWidth = it.minWidth || this.opts.minWidth
            it.minHeight = it.minHeight || this.opts.minHeight
            it.padding = it.padding || this.opts.padding
            it.iconPosition = it.iconPosition || this.opts.iconPosition
            it.iconColor = it.iconColor || this.opts.iconColor
            it.iconColorActive = it.iconColorActive || this.opts.iconColorActive
            it.fill = it.fill || this.opts.fill
            it.fillAlpha = it.fillAlpha || this.opts.fillAlpha
            it.fillActive = it.fillActive || this.opts.fillActive
            it.fillActiveAlpha = it.fillActiveAlpha || this.opts.fillActiveAlpha
            it.stroke = it.stroke || this.opts.stroke
            it.strokeWidth = it.strokeWidth != null ? it.strokeWidth : this.opts.strokeWidth
            it.strokeAlpha = it.strokeAlpha != null ? it.strokeAlpha : this.opts.strokeAlpha
            it.strokeActive = it.strokeActive || this.opts.strokeActive
            it.strokeActiveWidth = it.strokeActiveWidth != null ? it.strokeActiveWidth : this.opts.strokeActiveWidth
            it.strokeActiveAlpha = it.strokeActiveAlpha != null ? it.strokeActiveAlpha : this.opts.strokeActiveAlpha
            it.textStyle = it.textStyle || this.opts.textStyle
            it.textStyleActive = it.textStyleActive || this.opts.textStyleActive
            it.style = it.style || this.opts.style
            it.radius = it.radius != null ? it.radius : this.opts.radius
            if (!it.type) {
                switch (this.opts.type) {
                    case 'checkbox':
                        it.type = this.opts.type
                        break
                    default:
                        it.type = 'default'
                        break
                }
            }
            //it.type = it.type || this.opts.type || 'default'
            it.align = it.align || this.opts.align
            it.verticalAlign = it.verticalAlign || this.opts.verticalAlign
            it.afterAction = (event, button) => {
                if (this.opts.type === 'radio' && button.opts.type === 'default') {
                    this.buttons.forEach(it => {
                        if (it.opts.type === 'default') {
                            it.active = false
                        }
                    })

                    if (button.opts.type === 'default') {
                        button.active = true
                    }
                }
            }

            if (it.tooltip) {
                if (typeof it.tooltip === 'string') {
                    it.tooltip = { content: it.tooltip, container: this }
                } else {
                    it.tooltip = Object.assign({}, { container: this }, it.tooltip)
                }
            }

            let button = new Button(it)

            this.container.addChild(button)
            this.buttons.push(button)

            button.__originalPosition = {
                x: button.x,
                y: button.y
            }

            position += (this.opts.orientation === 'horizontal' ? button.width : button.height) + this.opts.margin

            button.__initIndex = index
            index++
        }

        if (this.opts.orientation === 'vertical') {
            const maxWidth = this.getMaxButtonWidth()

            this.buttons.forEach(it => {
                it.opts.minWidth = maxWidth
                it.layout()
            })
        }

        // disabled
        //-----------------
        if (this.opts.disabled != null) {
            this.disabled = this.opts.disabled
        }

        // interaction
        //--------------------
        if (this.opts.margin > 0 && (this.opts.maxWidth || this.opts.maxHeight)) {
            this.interactive = true
            this.on('pointerdown', this.onStart.bind(this))
            this.on('pointermove', this.onMove.bind(this))
            this.on('pointerup', this.onEnd.bind(this))
            this.on('pointercancel', this.onEnd.bind(this))
            this.on('pointerout', this.onEnd.bind(this))
            this.on('pointerupoutside', this.onEnd.bind(this))
            this.on('scroll', this.onScroll.bind(this))

            // mousewheel
            //--------------------
            if (this.opts.app) {
                const app = this.opts.app
                app.view.addEventListener('mousewheel', event => {
                    const bounds = this.getBounds()
                    const x = event.clientX - app.view.getBoundingClientRect().left
                    const y = event.clientY - app.view.getBoundingClientRect().top
                    if (bounds.contains(x, y)) {
                        event.preventDefault()
                        this.emit('scroll', event)
                    }
                })
            }

            const background = new PIXI.Graphics()
            background.beginFill(0x000000, 0)
            background.drawRect(0, 0, this.width, this.height)
            background.endFill()
            this.addChildAt(background, 0)

            this.__initWidth = this.container.width
        }

        return this
    }

    /**
     * Should be called to refresh the layout of the button group. Can be used after resizing.
     *
     * @return {ButtonGroup} A reference to the button group for chaining.
     */
    layout() {
        // set position
        //-----------------
        this.position.set(this.opts.x, this.opts.y)

        // draw
        //-----------------
        this.draw()

        // stack
        //-----------------
        if (this.opts.margin > 0 && (this.opts.maxWidth || this.opts.maxHeight)) {
            this.stack()
        }

        return this
    }

    /**
     * Draws the canvas.
     *
     * @private
     * @return {ButtonGroup} A reference to the button group for chaining.
     */
    draw() {
        if (this.opts.margin === 0) {
            this.buttons.forEach(it => it.hide())

            this.container.clear()
            this.container.lineStyle(this.opts.strokeWidth, this.opts.stroke, this.opts.strokeAlpha)
            this.container.beginFill(this.opts.fill, this.opts.fillAlpha)
            this.container.drawRoundedRect(0, 0, this.width, this.height, this.opts.radius)

            // Draw borders
            this.container.lineStyle(this.opts.strokeWidth, this.opts.stroke, this.opts.strokeAlpha / 2)

            this.buttons.forEach((it, i) => {
                if (i > 0) {
                    this.container.moveTo(it.x, it.y)

                    if (this.opts.orientation === 'horizontal') {
                        this.container.lineTo(it.x, it.height)
                    } else {
                        this.container.lineTo(it.width, it.y)
                    }
                }
            })

            this.container.endFill()
        }

        return this
    }

    /**
     * Gets or sets the disabled state. When disabled, no button of the button group can be clicked.
     *
     * @member {boolean}
     */
    get disabled() {
        return this._disabled
    }

    set disabled(value) {
        this._disabled = value

        this.buttons.forEach(it => (it.disabled = value))
    }

    /**
     * Gets or sets the maximum width of the button group for stacking. Usefull when you want to resize the available space.
     *
     * @member {number}
     */
    get maxWidth() {
        return this.opts.maxWidth
    }

    set maxWidth(value) {
        this.opts.maxWidth = value
        this.layout()
    }

    /**
     * Gets or sets the maximum height of the button group for stacking. Usefull when you want to resize the available space.
     *
     * @member {number}
     */
    get maxHeight() {
        return this.opts.maxHeight
    }

    set maxHeight(value) {
        this.opts.maxHeight = value
        this.layout()
    }

    /**
     * Searches all buttons of the button group and returns the maximum width of one button.
     *
     * @private
     * @return {number} The maximum with of a button of the button group.
     */
    getMaxButtonWidth() {
        let widths = this.buttons.map(it => it.width)

        return Math.max(...widths)
    }

    /**
     * Shows the button group (sets his alpha value to 1).
     *
     * @return {ButtonGroup} A reference to the button group for chaining.
     */
    show() {
        this.alpha = 1

        return this
    }

    /**
     * Hides the button group (sets his alpha value to 0).
     *
     * @return {ButtonGroup} A reference to the button group for chaining.
     */
    hide() {
        this.alpha = 0

        return this
    }

    /**
     *
     * @private
     * @param {*} event
     */
    onStart(event) {
        this.__dragging = true

        this.capture(event)

        this.__delta = {
            x: this.container.position.x - event.data.global.x,
            y: this.container.position.y - event.data.global.y
        }

        TweenLite.killTweensOf(this.container.position, { x: true, y: true })
        if (typeof ThrowPropsPlugin != 'undefined') {
            ThrowPropsPlugin.track(this.container.position, 'x,y')
        }
    }

    /**
     *
     * @private
     * @param {*} event
     */
    onMove(event) {
        if (this.__dragging) {
            this.capture(event)

            if (this.opts.orientation === 'horizontal') {
                this.container.position.x = event.data.global.x + this.__delta.x
            } else {
                this.container.position.y = event.data.global.y + this.__delta.y
            }

            this.stack()
        }
    }

    /**
     *
     * @private
     * @param {*} event
     */
    onEnd(event) {
        if (this.__dragging) {
            this.__dragging = false

            this.capture(event)

            const throwProps = { x: { velocity: 'auto' }, y: { velocity: 'auto' } }

            if (this.opts.orientation === 'horizontal') {
                const distanceToLeft = this.container.x
                const distanceToRight = this.opts.maxWidth - this.container.x - this.__initWidth
                if (distanceToLeft > 0 && distanceToLeft > distanceToRight) {
                    throwProps.x.end = 0
                } else if (distanceToRight > 0 && distanceToRight > distanceToLeft) {
                    throwProps.x.end = this.opts.maxWidth - this.__initWidth
                }
            } else {
                const distanceToTop = this.container.y
                const distanceToBottom = this.opts.maxHeight - this.container.y - this.container.height
                if (distanceToTop > 0 && distanceToTop > distanceToBottom) {
                    throwProps.y.end = 0
                } else if (distanceToBottom > 0 && distanceToBottom > distanceToTop) {
                    throwProps.y.end = this.opts.maxHeight - this.container.height
                }
            }

            if (typeof ThrowPropsPlugin != 'undefined') {
                ThrowPropsPlugin.to(
                    this.container.position,
                    {
                        throwProps,
                        ease: Strong.easeOut,
                        onUpdate: () => this.stack(),
                        onComplete: () => ThrowPropsPlugin.untrack(this.container.position)
                    },
                    0.8,
                    0.4
                )
            } else {
                if (this.opts.orientation === 'horizontal' && throwProps.x.end != null) {
                    TweenMax.to(this.container.position, 0.3, { x: throwProps.x.end, onUpdate: this.stack.bind(this) })
                } else if (this.opts.orientation === 'vertical' && throwProps.y.end != null) {
                    TweenMax.to(this.container.position, 0.3, { y: throwProps.y.end, onUpdate: this.stack.bind(this) })
                }
            }
        }
    }

    /**
     *
     * @private
     * @param {*} event
     */
    onScroll(event) {
        this.capture(event)

        if (this.opts.orientation === 'horizontal') {
            this.container.position.x -= event.deltaX
            if (this.container.position.x > 0) {
                this.container.position.x = 0
            } else if (this.container.position.x + this.__initWidth < this.opts.maxWidth) {
                this.container.position.x = this.opts.maxWidth - this.__initWidth
            }
        } else {
            this.container.position.y -= event.deltaY
            if (this.container.position.y > 0) {
                this.container.position.y = 0
            } else if (this.container.position.y + this.container.height < this.opts.maxHeight) {
                this.container.position.y = this.opts.maxHeight - this.container.height
            }
        }

        this.stack()
    }

    /**
     * Captures an event to inform InteractionMapper about processed events.
     *
     * @param {event|PIXI.InteractionEvent} event - The PIXI event to capture.
     */
    capture(event) {
        const originalEvent = event.data && event.data.originalEvent ? event.data.originalEvent : event
        Events.capturedBy(originalEvent, this)
    }

    /**
     *
     */
    stack() {
        if (this.opts.maxWidth) {
            this._stackHorizontal()
        } else if (this.opts.maxHeight) {
            this._stackVertical()
        }
    }

    /**
     *
     */
    _stackHorizontal() {
        const sorted = []

        let reverseCounter = this.buttons.length - 1

        this.buttons.forEach((it, index) => {
            const leftCorner = it.__originalPosition.x + this.container.x
            const rightCorner = it.__originalPosition.x + it.button.width
            const paddingLeft = index * this.opts.stackPadding
            const paddingRight = reverseCounter * this.opts.stackPadding
            if (leftCorner < paddingLeft) {
                // left border
                it.x = -this.container.x + paddingLeft
            } else if (rightCorner > -this.container.x + this.opts.maxWidth - paddingRight) {
                // right border
                it.x = -this.container.x + this.opts.maxWidth - it.button.width - paddingRight
            } else {
                it.x = it.__originalPosition.x
            }

            reverseCounter--

            sorted.push(it)
        })

        const min = Math.min(...sorted.map(it => it.x))
        const max = Math.max(...sorted.map(it => it.x + it.button.width))
        const center = (min + max) / 2

        // z-index
        sorted
            .sort((a, b) => {
                const centerA = a.x + a.button.width / 2
                const centerB = b.x + b.button.width / 2

                if (centerA < center && centerB < center) {
                    if (a.x < b.x) {
                        return -1
                    } else if (b.x < a.x) {
                        return 1
                    }
                } else if (centerA > center && centerB > center) {
                    if (a.x + a.button.width > b.x + b.button.width) {
                        return -1
                    } else if (b.x + b.button.width < a.x + a.button.x) {
                        return 1
                    }
                }

                return 0
            })
            .forEach(it => it.parent.addChild(it))
    }

    /**
     *
     */
    _stackVertical() {
        const sorted = []

        let reverseCounter = this.buttons.length - 1

        this.buttons.forEach((it, index) => {
            const topCorner = it.__originalPosition.y + this.container.y
            const bottomCorner = it.__originalPosition.y + it.button.height
            const paddingTop = index * this.opts.stackPadding
            const paddingBottom = reverseCounter * this.opts.stackPadding
            if (topCorner < paddingTop) {
                // top border
                it.y = -this.container.y + paddingTop
            } else if (bottomCorner > -this.container.y + this.opts.maxHeight - paddingBottom) {
                // bottom border
                it.y = -this.container.y + this.opts.maxHeight - it.button.height - paddingBottom
            } else {
                it.y = it.__originalPosition.y
            }

            reverseCounter--

            sorted.push(it)
        })

        const min = Math.min(...sorted.map(it => it.y))
        const max = Math.max(...sorted.map(it => it.y + it.button.height))
        const center = (min + max) / 2

        // z-index
        sorted
            .sort((a, b) => {
                const centerA = a.y + a.button.height / 2
                const centerB = b.y + b.button.height / 2

                if (centerA < center && centerB < center) {
                    if (a.y < b.y) {
                        return -1
                    } else if (b.y < a.y) {
                        return 1
                    }
                } else if (centerA > center && centerB > center) {
                    if (a.y + a.button.height > b.y + b.button.height) {
                        return -1
                    } else if (b.y + b.button.height < a.y + a.button.y) {
                        return 1
                    }
                }

                return 0
            })
            .forEach(it => it.parent.addChild(it))
    }
}