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-rw-r--r--ext/js/display/display-resizer.js172
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diff --git a/ext/js/display/display-resizer.js b/ext/js/display/display-resizer.js
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+/*
+ * Copyright (C) 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 DisplayResizer {
+ constructor(display) {
+ this._display = display;
+ this._token = null;
+ this._handle = null;
+ this._touchIdentifier = null;
+ this._startSize = null;
+ this._startOffset = null;
+ this._eventListeners = new EventListenerCollection();
+ }
+
+ prepare() {
+ this._handle = document.querySelector('#frame-resizer-handle');
+ if (this._handle === null) { return; }
+
+ this._handle.addEventListener('mousedown', this._onFrameResizerMouseDown.bind(this), false);
+ this._handle.addEventListener('touchstart', this._onFrameResizerTouchStart.bind(this), false);
+ }
+
+ // Private
+
+ _onFrameResizerMouseDown(e) {
+ if (e.button !== 0) { return; }
+ // Don't do e.preventDefault() here; this allows mousemove events to be processed
+ // if the pointer moves out of the frame.
+ this._startFrameResize(e);
+ }
+
+ _onFrameResizerTouchStart(e) {
+ e.preventDefault();
+ this._startFrameResizeTouch(e);
+ }
+
+ _onFrameResizerMouseUp() {
+ this._stopFrameResize();
+ }
+
+ _onFrameResizerWindowBlur() {
+ this._stopFrameResize();
+ }
+
+ _onFrameResizerMouseMove(e) {
+ if ((e.buttons & 0x1) === 0x0) {
+ this._stopFrameResize();
+ } else {
+ if (this._startSize === null) { return; }
+ const {clientX: x, clientY: y} = e;
+ this._updateFrameSize(x, y);
+ }
+ }
+
+ _onFrameResizerTouchEnd(e) {
+ if (this._getTouch(e.changedTouches, this._touchIdentifier) === null) { return; }
+ this._stopFrameResize();
+ }
+
+ _onFrameResizerTouchCancel(e) {
+ if (this._getTouch(e.changedTouches, this._touchIdentifier) === null) { return; }
+ this._stopFrameResize();
+ }
+
+ _onFrameResizerTouchMove(e) {
+ if (this._startSize === null) { return; }
+ const primaryTouch = this._getTouch(e.changedTouches, this._touchIdentifier);
+ if (primaryTouch === null) { return; }
+ const {clientX: x, clientY: y} = primaryTouch;
+ this._updateFrameSize(x, y);
+ }
+
+ _startFrameResize(e) {
+ if (this._token !== null) { return; }
+
+ const {clientX: x, clientY: y} = e;
+ const token = {};
+ this._token = token;
+ this._startOffset = {x, y};
+ this._eventListeners.addEventListener(window, 'mouseup', this._onFrameResizerMouseUp.bind(this), false);
+ this._eventListeners.addEventListener(window, 'blur', this._onFrameResizerWindowBlur.bind(this), false);
+ this._eventListeners.addEventListener(window, 'mousemove', this._onFrameResizerMouseMove.bind(this), false);
+
+ const {documentElement} = document;
+ if (documentElement !== null) {
+ documentElement.dataset.isResizing = 'true';
+ }
+
+ this._initializeFrameResize(token);
+ }
+
+ _startFrameResizeTouch(e) {
+ if (this._token !== null) { return; }
+
+ const {clientX: x, clientY: y, identifier} = e.changedTouches[0];
+ const token = {};
+ this._token = token;
+ this._startOffset = {x, y};
+ this._touchIdentifier = identifier;
+ this._eventListeners.addEventListener(window, 'touchend', this._onFrameResizerTouchEnd.bind(this), false);
+ this._eventListeners.addEventListener(window, 'touchcancel', this._onFrameResizerTouchCancel.bind(this), false);
+ this._eventListeners.addEventListener(window, 'blur', this._onFrameResizerWindowBlur.bind(this), false);
+ this._eventListeners.addEventListener(window, 'touchmove', this._onFrameResizerTouchMove.bind(this), false);
+
+ const {documentElement} = document;
+ if (documentElement !== null) {
+ documentElement.dataset.isResizing = 'true';
+ }
+
+ this._initializeFrameResize(token);
+ }
+
+ async _initializeFrameResize(token) {
+ const {parentPopupId} = this._display;
+ if (parentPopupId === null) { return; }
+
+ const size = await this._display.invokeParentFrame('popup.getFrameSize', {id: parentPopupId});
+ if (this._token !== token) { return; }
+ this._startSize = size;
+ }
+
+ _stopFrameResize() {
+ if (this._token === null) { return; }
+
+ this._eventListeners.removeAllEventListeners();
+ this._startSize = null;
+ this._startOffset = null;
+ this._touchIdentifier = null;
+ this._token = null;
+
+ const {documentElement} = document;
+ if (documentElement !== null) {
+ delete documentElement.dataset.isResizing;
+ }
+ }
+
+ async _updateFrameSize(x, y) {
+ const {parentPopupId} = this._display;
+ if (parentPopupId === null) { return; }
+
+ const handleSize = this._handle.getBoundingClientRect();
+ let {width, height} = this._startSize;
+ width += x - this._startOffset.x;
+ height += y - this._startOffset.y;
+ width = Math.max(Math.max(0, handleSize.width), width);
+ height = Math.max(Math.max(0, handleSize.height), height);
+ await this._display.invokeParentFrame('popup.setFrameSize', {id: parentPopupId, width, height});
+ }
+
+ _getTouch(touchList, identifier) {
+ for (const touch of touchList) {
+ if (touch.identifier === identifier) {
+ return touch;
+ }
+ }
+ return null;
+ }
+}