/* * Copyright (C) 2020-2021 Yomichan Authors * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <https://www.gnu.org/licenses/>. */ class PopupMenu extends EventDispatcher { constructor(sourceElement, container) { super(); this._sourceElement = sourceElement; this._container = container; this._menu = container.querySelector('.popup-menu'); this._isClosed = false; this._eventListeners = new EventListenerCollection(); } get isClosed() { return this._isClosed; } prepare() { const items = this._menu.querySelectorAll('.popup-menu-item'); this._setPosition(items); this._container.focus(); this._eventListeners.addEventListener(window, 'resize', this._onWindowResize.bind(this), false); this._eventListeners.addEventListener(this._container, 'click', this._onMenuContainerClick.bind(this), false); const onMenuItemClick = this._onMenuItemClick.bind(this); for (const item of items) { this._eventListeners.addEventListener(item, 'click', onMenuItemClick, false); } this._sourceElement.dispatchEvent(new CustomEvent('menuOpened', { bubbles: false, cancelable: false, detail: { popupMenu: this, container: this._container, menu: this._menu } })); } close() { return this._close(null, 'close'); } // Private _onMenuContainerClick(e) { if (e.currentTarget !== e.target) { return; } this._close(null, 'outside'); } _onMenuItemClick(e) { const item = e.currentTarget; if (item.disabled) { return; } this._close(item, 'item'); } _onWindowResize() { this._close(null, 'resize'); } _setPosition(items) { // Get flags let horizontal = 1; let vertical = 1; let horizontalCover = 1; let verticalCover = 1; const positionInfo = this._sourceElement.dataset.menuPosition; if (typeof positionInfo === 'string') { const positionInfoSet = new Set(positionInfo.split(',')); if (positionInfoSet.has('left')) { horizontal = -1; } else if (positionInfoSet.has('right')) { horizontal = 1; } else if (positionInfoSet.has('h-center')) { horizontal = 0; } if (positionInfoSet.has('above')) { vertical = -1; } else if (positionInfoSet.has('below')) { vertical = 1; } else if (positionInfoSet.has('v-center')) { vertical = 0; } if (positionInfoSet.has('cover')) { horizontalCover = 1; verticalCover = 1; } else if (positionInfoSet.has('no-cover')) { horizontalCover = -1; verticalCover = -1; } if (positionInfoSet.has('h-cover')) { horizontalCover = 1; } else if (positionInfoSet.has('no-h-cover')) { horizontalCover = -1; } if (positionInfoSet.has('v-cover')) { verticalCover = 1; } else if (positionInfoSet.has('no-v-cover')) { verticalCover = -1; } } // Position const menu = this._menu; const fullRect = this._container.getBoundingClientRect(); const sourceRect = this._sourceElement.getBoundingClientRect(); const menuRect = menu.getBoundingClientRect(); let top = menuRect.top; let bottom = menuRect.bottom; if (verticalCover === 1 && items.length > 0) { const rect1 = items[0].getBoundingClientRect(); const rect2 = items[items.length - 1].getBoundingClientRect(); top = rect1.top; bottom = rect2.bottom; } let x = ( sourceRect.left + sourceRect.width * ((-horizontal * horizontalCover + 1) * 0.5) + menuRect.width * ((-horizontal + 1) * -0.5) ); let y = ( sourceRect.top + (menuRect.top - top) + sourceRect.height * ((-vertical * verticalCover + 1) * 0.5) + (bottom - top) * ((-vertical + 1) * -0.5) ); x = Math.max(0.0, Math.min(fullRect.width - menuRect.width, x)); y = Math.max(0.0, Math.min(fullRect.height - menuRect.height, y)); menu.style.left = `${x}px`; menu.style.top = `${y}px`; } _close(item, cause) { if (this._isClosed) { return true; } const action = (item !== null ? item.dataset.menuAction : null); const result = this._sourceElement.dispatchEvent(new CustomEvent('menuClosed', { bubbles: false, cancelable: true, detail: { popupMenu: this, container: this._container, menu: this._menu, item, action, cause } })); if (!result) { return false; } this._eventListeners.removeAllEventListeners(); if (this._container.parentNode !== null) { this._container.parentNode.removeChild(this._container); } this.trigger('closed', { popupMenu: this, container: this._container, menu: this._menu, item, action, cause }); return true; } }