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-rw-r--r--ext/mixed/js/popup-menu.js198
1 files changed, 198 insertions, 0 deletions
diff --git a/ext/mixed/js/popup-menu.js b/ext/mixed/js/popup-menu.js
new file mode 100644
index 00000000..5ae7435c
--- /dev/null
+++ b/ext/mixed/js/popup-menu.js
@@ -0,0 +1,198 @@
+/*
+ * 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._isClosed = false;
+ this._eventListeners = new EventListenerCollection();
+ }
+
+ get sourceElement() {
+ return this._sourceElement;
+ }
+
+ get containerNode() {
+ return this._containerNode;
+ }
+
+ get node() {
+ return this._node;
+ }
+
+ get isClosed() {
+ return this._isClosed;
+ }
+
+ prepare() {
+ const items = this._node.querySelectorAll('.popup-menu-item');
+ this._setPosition(items);
+ 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; }
+ this._close(null, 'outside', true);
+ }
+
+ _onMenuItemClick(e) {
+ const item = e.currentTarget;
+ if (item.disabled) { return; }
+ this._close(item, 'item', true);
+ }
+
+ _onWindowResize() {
+ this._close(null, 'resize', true);
+ }
+
+ _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._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 && 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, 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()
+});