diff options
Diffstat (limited to 'ext/js/dom/popup-menu.js')
| -rw-r--r-- | ext/js/dom/popup-menu.js | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/ext/js/dom/popup-menu.js b/ext/js/dom/popup-menu.js new file mode 100644 index 00000000..9ad4e260 --- /dev/null +++ b/ext/js/dom/popup-menu.js @@ -0,0 +1,206 @@ +/* + * 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, containerNode) { + super(); + this._sourceElement = sourceElement; + this._containerNode = containerNode; + this._node = containerNode.querySelector('.popup-menu'); + this._bodyNode = containerNode.querySelector('.popup-menu-body'); + this._isClosed = false; + this._eventListeners = new EventListenerCollection(); + } + + get sourceElement() { + return this._sourceElement; + } + + get containerNode() { + return this._containerNode; + } + + get node() { + return this._node; + } + + get bodyNode() { + return this._bodyNode; + } + + get isClosed() { + return this._isClosed; + } + + prepare() { + const items = this._bodyNode.querySelectorAll('.popup-menu-item'); + this._setPosition(); + this._containerNode.focus(); + + this._eventListeners.addEventListener(window, 'resize', this._onWindowResize.bind(this), false); + this._eventListeners.addEventListener(this._containerNode, 'click', this._onMenuContainerClick.bind(this), false); + + const onMenuItemClick = this._onMenuItemClick.bind(this); + for (const item of items) { + this._eventListeners.addEventListener(item, 'click', onMenuItemClick, false); + } + + PopupMenu.openMenus.add(this); + + this._sourceElement.dispatchEvent(new CustomEvent('menuOpen', { + bubbles: false, + cancelable: false, + detail: {menu: this} + })); + } + + close(cancelable=true) { + return this._close(null, 'close', cancelable); + } + + // Private + + _onMenuContainerClick(e) { + if (e.currentTarget !== e.target) { return; } + e.stopPropagation(); + e.preventDefault(); + this._close(null, 'outside', true); + } + + _onMenuItemClick(e) { + const item = e.currentTarget; + if (item.disabled) { return; } + e.stopPropagation(); + e.preventDefault(); + this._close(item, 'item', true); + } + + _onWindowResize() { + this._close(null, 'resize', true); + } + + _setPosition() { + // 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._node; + const fullRect = this._containerNode.getBoundingClientRect(); + const sourceRect = this._sourceElement.getBoundingClientRect(); + const menuRect = menu.getBoundingClientRect(); + let top = menuRect.top; + let bottom = menuRect.bottom; + if (verticalCover === 1) { + const bodyRect = this._bodyNode.getBoundingClientRect(); + top = bodyRect.top; + bottom = bodyRect.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, cancelable) { + if (this._isClosed) { return true; } + const action = (item !== null ? item.dataset.menuAction : null); + + const detail = { + menu: this, + item, + action, + cause + }; + const result = this._sourceElement.dispatchEvent(new CustomEvent('menuClose', {bubbles: false, cancelable, detail})); + if (cancelable && !result) { return false; } + + PopupMenu.openMenus.delete(this); + + this._isClosed = true; + this._eventListeners.removeAllEventListeners(); + if (this._containerNode.parentNode !== null) { + this._containerNode.parentNode.removeChild(this._containerNode); + } + + this.trigger('close', detail); + return true; + } +} + +Object.defineProperty(PopupMenu, 'openMenus', { + configurable: false, + enumerable: true, + writable: false, + value: new Set() +}); |