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GGn Corner Button

Add buttons to group content's top corners

Dieses Skript sollte nicht direkt installiert werden. Es handelt sich hier um eine Bibliothek für andere Skripte, welche über folgenden Befehl in den Metadaten eines Skriptes eingebunden wird // @require https://update.greatest.deepsurf.us/scripts/541342/1618982/GGn%20Corner%20Button.js 

// ==UserScript==
// @name         GGn Corner Button
// @version      2
// @description  Add buttons to group content's top corners. In the main script, @grant GM_getValue to be customise position in settings. @grant GM_registerMenuCommand to register a Run command if position is set to none
// @author       ingts
// @match        https://gazellegames.net/
// ==/UserScript==
/**
 * @typedef {('none' | 'left' | 'left-vertical' | 'right' | 'right-vertical')} Position
 */

/**
 * @type HTMLDivElement
 */
const groupContentDiv = document.getElementById('content')

/**
 * @param {Position} position
 * @param {string} text
 * @param {(e: MouseEvent) => void} onclick
 */
function createCornerButton(position, text, onclick) {
    if (!groupContentDiv) return

    if (typeof GM_getValue !== "undefined") {
        if (typeof GM_getValue('corner_button') === 'undefined')
            GM_setValue('corner_button', position)

        position = GM_getValue('corner_button')
    }

    if (typeof GM_registerMenuCommand !== "undefined" && position === 'none') {
        GM_registerMenuCommand('Run', onclick)
        return
    }

    const container = createContainer(position)

    const button = document.createElement('button')
    button.textContent = text
    button.type = 'button'
    if (position.includes('vertical')) {
        button.style.writingMode = 'vertical-lr'
        button.style.height = 'unset'

        if (position.includes('left')) {
            button.style.rotate = 'z 180deg'
        }
    }
    button.style.padding = '2px'
    button.onclick = e => onclick(e)
    container.append(button)

    let leftPos = 0
    let topPos = 0
    switch (position) {
        case 'left':
            leftPos = groupContentDiv.offsetLeft + container.offsetWidth - container.scrollWidth
            topPos = groupContentDiv.offsetTop - container.offsetHeight
            break
        case 'left-vertical':
            leftPos = groupContentDiv.offsetLeft - container.offsetWidth
            topPos = groupContentDiv.offsetTop
            break
        case 'right':
            leftPos = groupContentDiv.offsetLeft + groupContentDiv.offsetWidth - container.scrollWidth
            topPos = groupContentDiv.offsetTop - container.offsetHeight
            break
        case 'right-vertical':
            leftPos = groupContentDiv.offsetLeft + groupContentDiv.offsetWidth
            topPos = groupContentDiv.offsetTop
    }

    requestAnimationFrame(() => {
        container.style.left = leftPos + 'px'
        container.style.top = topPos + 'px'
    })
}

/**
 * @private
 * @param {Position} position
 */
function createContainer(position) {
    const elementId = `${position}-corner-container`
    let container = document.getElementById(elementId)
    if (container) return container

    container = document.createElement('div')
    container.id = elementId
    container.style.position = 'absolute'
    container.style.display = 'flex'
    if (position.includes('vertical')) {
        container.style.flexDirection = 'column'
    }
    container.style.gap = '2px'

    document.body.append(container)
    return container
}