mirror of
https://github.com/overleaf/overleaf.git
synced 2024-11-07 20:31:06 -05:00
417 lines
No EOL
15 KiB
JavaScript
Executable file
417 lines
No EOL
15 KiB
JavaScript
Executable file
/* ***** BEGIN LICENSE BLOCK *****
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* Distributed under the BSD license:
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*
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* Copyright (c) 2010, Ajax.org B.V.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of Ajax.org B.V. nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL AJAX.ORG B.V. BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* ***** END LICENSE BLOCK ***** */
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define(function(require, exports, module) {
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"use strict";
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var dom = require("../lib/dom");
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var event = require("../lib/event");
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var useragent = require("../lib/useragent");
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var AUTOSCROLL_DELAY = 200;
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var SCROLL_CURSOR_DELAY = 200;
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var SCROLL_CURSOR_HYSTERESIS = 5;
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function DragdropHandler(mouseHandler) {
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var editor = mouseHandler.editor;
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var blankImage = dom.createElement("img");
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// Safari crashes without image data
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blankImage.src = "data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==";
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if (useragent.isOpera)
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blankImage.style.cssText = "width:1px;height:1px;position:fixed;top:0;left:0;z-index:2147483647;opacity:0;";
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var exports = ["dragWait", "dragWaitEnd", "startDrag", "dragReadyEnd", "onMouseDrag"];
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exports.forEach(function(x) {
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mouseHandler[x] = this[x];
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}, this);
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editor.addEventListener("mousedown", this.onMouseDown.bind(mouseHandler));
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var mouseTarget = editor.container;
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var dragSelectionMarker, x, y;
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var timerId, range;
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var dragCursor, counter = 0;
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var dragOperation;
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var isInternal;
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var autoScrollStartTime;
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var cursorMovedTime;
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var cursorPointOnCaretMoved;
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this.onDragStart = function(e) {
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// webkit workaround, see this.onMouseDown
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if (this.cancelDrag || !mouseTarget.draggable) {
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var self = this;
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setTimeout(function(){
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self.startSelect();
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self.captureMouse(e);
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}, 0);
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return e.preventDefault();
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}
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range = editor.getSelectionRange();
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var dataTransfer = e.dataTransfer;
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dataTransfer.effectAllowed = editor.getReadOnly() ? "copy" : "copyMove";
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if (useragent.isOpera) {
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editor.container.appendChild(blankImage);
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// force layout
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blankImage._top = blankImage.offsetTop;
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}
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dataTransfer.setDragImage && dataTransfer.setDragImage(blankImage, 0, 0);
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if (useragent.isOpera) {
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editor.container.removeChild(blankImage);
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}
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// clear Opera garbage
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dataTransfer.clearData();
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dataTransfer.setData("Text", editor.session.getTextRange());
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isInternal = true;
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this.setState("drag");
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};
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this.onDragEnd = function(e) {
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mouseTarget.draggable = false;
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isInternal = false;
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this.setState(null);
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if (!editor.getReadOnly()) {
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var dropEffect = e.dataTransfer.dropEffect;
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if (!dragOperation && dropEffect == "move")
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// text was dragged outside the editor
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editor.session.remove(editor.getSelectionRange());
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editor.renderer.$cursorLayer.setBlinking(true);
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}
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this.editor.unsetStyle("ace_dragging");
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};
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this.onDragEnter = function(e) {
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if (editor.getReadOnly() || !canAccept(e.dataTransfer))
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return;
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if (!dragSelectionMarker)
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addDragMarker();
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counter++;
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// dataTransfer object does not save dropEffect across events on IE, so we store it in dragOperation
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e.dataTransfer.dropEffect = dragOperation = getDropEffect(e);
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return event.preventDefault(e);
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};
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this.onDragOver = function(e) {
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if (editor.getReadOnly() || !canAccept(e.dataTransfer))
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return;
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// Opera doesn't trigger dragenter event on drag start
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if (!dragSelectionMarker) {
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addDragMarker();
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counter++;
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}
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if (onMouseMoveTimer !== null)
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onMouseMoveTimer = null;
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x = e.clientX;
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y = e.clientY;
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e.dataTransfer.dropEffect = dragOperation = getDropEffect(e);
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return event.preventDefault(e);
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};
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this.onDragLeave = function(e) {
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counter--;
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if (counter <= 0 && dragSelectionMarker) {
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clearDragMarker();
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dragOperation = null;
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return event.preventDefault(e);
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}
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};
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this.onDrop = function(e) {
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if (!dragSelectionMarker)
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return;
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var dataTransfer = e.dataTransfer;
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if (isInternal) {
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switch (dragOperation) {
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case "move":
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if (range.contains(dragCursor.row, dragCursor.column)) {
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// clear selection
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range = {
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start: dragCursor,
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end: dragCursor
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};
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} else {
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// move text
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range = editor.moveText(range, dragCursor);
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}
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break;
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case "copy":
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// copy text
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range = editor.moveText(range, dragCursor, true);
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break;
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}
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} else {
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var dropData = dataTransfer.getData('Text');
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range = {
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start: dragCursor,
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end: editor.session.insert(dragCursor, dropData)
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};
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editor.focus();
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dragOperation = null;
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}
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clearDragMarker();
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return event.preventDefault(e);
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};
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event.addListener(mouseTarget, "dragstart", this.onDragStart.bind(mouseHandler));
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event.addListener(mouseTarget, "dragend", this.onDragEnd.bind(mouseHandler));
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event.addListener(mouseTarget, "dragenter", this.onDragEnter.bind(mouseHandler));
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event.addListener(mouseTarget, "dragover", this.onDragOver.bind(mouseHandler));
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event.addListener(mouseTarget, "dragleave", this.onDragLeave.bind(mouseHandler));
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event.addListener(mouseTarget, "drop", this.onDrop.bind(mouseHandler));
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function scrollCursorIntoView(cursor, prevCursor) {
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var now = new Date().getTime();
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var vMovement = !prevCursor || cursor.row != prevCursor.row;
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var hMovement = !prevCursor || cursor.column != prevCursor.column;
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if (!cursorMovedTime || vMovement || hMovement) {
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editor.$blockScrolling += 1;
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editor.moveCursorToPosition(cursor);
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editor.$blockScrolling -= 1;
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cursorMovedTime = now;
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cursorPointOnCaretMoved = {x: x, y: y};
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} else {
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var distance = calcDistance(cursorPointOnCaretMoved.x, cursorPointOnCaretMoved.y, x, y);
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if (distance > SCROLL_CURSOR_HYSTERESIS) {
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cursorMovedTime = null;
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} else if (now - cursorMovedTime >= SCROLL_CURSOR_DELAY) {
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editor.renderer.scrollCursorIntoView();
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cursorMovedTime = null;
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}
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}
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}
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function autoScroll(cursor, prevCursor) {
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var now = new Date().getTime();
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var lineHeight = editor.renderer.layerConfig.lineHeight;
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var characterWidth = editor.renderer.layerConfig.characterWidth;
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var editorRect = editor.renderer.scroller.getBoundingClientRect();
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var offsets = {
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x: {
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left: x - editorRect.left,
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right: editorRect.right - x
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},
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y: {
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top: y - editorRect.top,
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bottom: editorRect.bottom - y
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}
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};
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var nearestXOffset = Math.min(offsets.x.left, offsets.x.right);
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var nearestYOffset = Math.min(offsets.y.top, offsets.y.bottom);
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var scrollCursor = {row: cursor.row, column: cursor.column};
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if (nearestXOffset / characterWidth <= 2) {
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scrollCursor.column += (offsets.x.left < offsets.x.right ? -3 : +2);
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}
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if (nearestYOffset / lineHeight <= 1) {
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scrollCursor.row += (offsets.y.top < offsets.y.bottom ? -1 : +1);
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}
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var vScroll = cursor.row != scrollCursor.row;
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var hScroll = cursor.column != scrollCursor.column;
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var vMovement = !prevCursor || cursor.row != prevCursor.row;
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if (vScroll || (hScroll && !vMovement)) {
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if (!autoScrollStartTime)
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autoScrollStartTime = now;
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else if (now - autoScrollStartTime >= AUTOSCROLL_DELAY)
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editor.renderer.scrollCursorIntoView(scrollCursor);
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} else {
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autoScrollStartTime = null;
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}
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}
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function onDragInterval() {
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var prevCursor = dragCursor;
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dragCursor = editor.renderer.screenToTextCoordinates(x, y);
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scrollCursorIntoView(dragCursor, prevCursor);
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autoScroll(dragCursor, prevCursor);
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}
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function addDragMarker() {
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range = editor.selection.toOrientedRange();
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dragSelectionMarker = editor.session.addMarker(range, "ace_selection", editor.getSelectionStyle());
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editor.clearSelection();
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if (editor.isFocused())
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editor.renderer.$cursorLayer.setBlinking(false);
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clearInterval(timerId);
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timerId = setInterval(onDragInterval, 20);
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counter = 0;
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event.addListener(document, "mousemove", onMouseMove);
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}
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function clearDragMarker() {
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clearInterval(timerId);
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editor.session.removeMarker(dragSelectionMarker);
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dragSelectionMarker = null;
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editor.$blockScrolling += 1;
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editor.selection.fromOrientedRange(range);
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editor.$blockScrolling -= 1;
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if (editor.isFocused() && !isInternal)
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editor.renderer.$cursorLayer.setBlinking(!editor.getReadOnly());
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range = null;
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counter = 0;
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autoScrollStartTime = null;
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cursorMovedTime = null;
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event.removeListener(document, "mousemove", onMouseMove);
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}
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// sometimes other code on the page can stop dragleave event leaving editor stuck in the drag state
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var onMouseMoveTimer = null;
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function onMouseMove() {
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if (onMouseMoveTimer == null) {
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onMouseMoveTimer = setTimeout(function() {
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if (onMouseMoveTimer != null && dragSelectionMarker)
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clearDragMarker();
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}, 20);
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}
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}
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function canAccept(dataTransfer) {
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var types = dataTransfer.types;
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return !types || Array.prototype.some.call(types, function(type) {
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return type == 'text/plain' || type == 'Text';
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});
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}
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function getDropEffect(e) {
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var copyAllowed = ['copy', 'copymove', 'all', 'uninitialized'];
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var moveAllowed = ['move', 'copymove', 'linkmove', 'all', 'uninitialized'];
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var copyModifierState = useragent.isMac ? e.altKey : e.ctrlKey;
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// IE throws error while dragging from another app
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var effectAllowed = "uninitialized";
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try {
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effectAllowed = e.dataTransfer.effectAllowed.toLowerCase();
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} catch (e) {}
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var dropEffect = "none";
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if (copyModifierState && copyAllowed.indexOf(effectAllowed) >= 0)
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dropEffect = "copy";
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else if (moveAllowed.indexOf(effectAllowed) >= 0)
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dropEffect = "move";
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else if (copyAllowed.indexOf(effectAllowed) >= 0)
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dropEffect = "copy";
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return dropEffect;
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}
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}
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(function() {
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this.dragWait = function() {
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var interval = (new Date()).getTime() - this.mousedownEvent.time;
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if (interval > this.editor.getDragDelay())
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this.startDrag();
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};
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this.dragWaitEnd = function() {
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var target = this.editor.container;
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target.draggable = false;
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this.startSelect(this.mousedownEvent.getDocumentPosition());
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this.selectEnd();
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};
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this.dragReadyEnd = function(e) {
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this.editor.renderer.$cursorLayer.setBlinking(!this.editor.getReadOnly());
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this.editor.unsetStyle("ace_dragging");
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this.dragWaitEnd();
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};
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this.startDrag = function(){
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this.cancelDrag = false;
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var target = this.editor.container;
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target.draggable = true;
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this.editor.renderer.$cursorLayer.setBlinking(false);
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this.editor.setStyle("ace_dragging");
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this.setState("dragReady");
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};
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this.onMouseDrag = function(e) {
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var target = this.editor.container;
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if (useragent.isIE && this.state == "dragReady") {
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// IE does not handle [draggable] attribute set after mousedown
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var distance = calcDistance(this.mousedownEvent.x, this.mousedownEvent.y, this.x, this.y);
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if (distance > 3)
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target.dragDrop();
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}
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if (this.state === "dragWait") {
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var distance = calcDistance(this.mousedownEvent.x, this.mousedownEvent.y, this.x, this.y);
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if (distance > 0) {
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target.draggable = false;
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this.startSelect(this.mousedownEvent.getDocumentPosition());
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}
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}
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};
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this.onMouseDown = function(e) {
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if (!this.$dragEnabled)
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return;
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this.mousedownEvent = e;
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var editor = this.editor;
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var inSelection = e.inSelection();
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var button = e.getButton();
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var clickCount = e.domEvent.detail || 1;
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if (clickCount === 1 && button === 0 && inSelection) {
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this.mousedownEvent.time = (new Date()).getTime();
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var eventTarget = e.domEvent.target || e.domEvent.srcElement;
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if ("unselectable" in eventTarget)
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eventTarget.unselectable = "on";
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if (editor.getDragDelay()) {
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// https://code.google.com/p/chromium/issues/detail?id=286700
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if (useragent.isWebKit) {
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self.cancelDrag = true;
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var mouseTarget = editor.container;
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mouseTarget.draggable = true;
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}
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this.setState("dragWait");
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} else {
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this.startDrag();
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}
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this.captureMouse(e, this.onMouseDrag.bind(this));
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// TODO: a better way to prevent default handler without preventing browser default action
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e.defaultPrevented = true;
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}
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};
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}).call(DragdropHandler.prototype);
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function calcDistance(ax, ay, bx, by) {
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return Math.sqrt(Math.pow(bx - ax, 2) + Math.pow(by - ay, 2));
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}
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exports.DragdropHandler = DragdropHandler;
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}); |