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| 1 // Copyright 2013 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 cr.define('dnd', function() { | |
| 6 'use strict'; | |
| 7 | |
| 8 /** @const */ var BookmarkList = bmm.BookmarkList; | |
| 9 /** @const */ var ListItem = cr.ui.ListItem; | |
| 10 /** @const */ var TreeItem = cr.ui.TreeItem; | |
| 11 | |
| 12 /** | |
| 13 * Enumeration of valid drop locations relative to an element. These are | |
| 14 * bit masks to allow combining multiple locations in a single value. | |
| 15 * @enum {number} | |
| 16 * @const | |
| 17 */ | |
| 18 var DropPosition = { | |
| 19 NONE: 0, | |
| 20 ABOVE: 1, | |
| 21 ON: 2, | |
| 22 BELOW: 4 | |
| 23 }; | |
| 24 | |
| 25 /** | |
| 26 * @type {Object} Drop information calculated in |handleDragOver|. | |
| 27 */ | |
| 28 var dropDestination = null; | |
| 29 | |
| 30 /** | |
| 31 * @type {number} Timer id used to help minimize flicker. | |
| 32 */ | |
| 33 var removeDropIndicatorTimer; | |
| 34 | |
| 35 /** | |
| 36 * The element that had a style applied it to indicate the drop location. | |
| 37 * This is used to easily remove the style when necessary. | |
| 38 * @type {Element} | |
| 39 */ | |
| 40 var lastIndicatorElement; | |
| 41 | |
| 42 /** | |
| 43 * The style that was applied to indicate the drop location. | |
| 44 * @type {string} | |
| 45 */ | |
| 46 var lastIndicatorClassName; | |
| 47 | |
| 48 var dropIndicator = { | |
| 49 /** | |
| 50 * Applies the drop indicator style on the target element and stores that | |
| 51 * information to easily remove the style in the future. | |
| 52 */ | |
| 53 addDropIndicatorStyle: function(indicatorElement, position) { | |
| 54 var indicatorStyleName = position == DropPosition.ABOVE ? 'drag-above' : | |
| 55 position == DropPosition.BELOW ? 'drag-below' : | |
| 56 'drag-on'; | |
| 57 | |
| 58 lastIndicatorElement = indicatorElement; | |
| 59 lastIndicatorClassName = indicatorStyleName; | |
| 60 | |
| 61 indicatorElement.classList.add(indicatorStyleName); | |
| 62 }, | |
| 63 | |
| 64 /** | |
| 65 * Clears the drop indicator style from the last element was the drop target | |
| 66 * so the drop indicator is no longer for that element. | |
| 67 */ | |
| 68 removeDropIndicatorStyle: function() { | |
| 69 if (!lastIndicatorElement || !lastIndicatorClassName) | |
| 70 return; | |
| 71 lastIndicatorElement.classList.remove(lastIndicatorClassName); | |
| 72 lastIndicatorElement = null; | |
| 73 lastIndicatorClassName = null; | |
| 74 }, | |
| 75 | |
| 76 /** | |
| 77 * Displays the drop indicator on the current drop target to give the | |
| 78 * user feedback on where the drop will occur. | |
| 79 */ | |
| 80 update: function(dropDest) { | |
| 81 window.clearTimeout(removeDropIndicatorTimer); | |
| 82 | |
| 83 var indicatorElement = dropDest.element; | |
| 84 var position = dropDest.position; | |
| 85 if (dropDest.element instanceof BookmarkList) { | |
| 86 // For an empty bookmark list use 'drop-above' style. | |
| 87 position = DropPosition.ABOVE; | |
| 88 } else if (dropDest.element instanceof TreeItem) { | |
| 89 indicatorElement = indicatorElement.querySelector('.tree-row'); | |
| 90 } | |
| 91 dropIndicator.removeDropIndicatorStyle(); | |
| 92 dropIndicator.addDropIndicatorStyle(indicatorElement, position); | |
| 93 }, | |
| 94 | |
| 95 /** | |
| 96 * Stop displaying the drop indicator. | |
| 97 */ | |
| 98 finish: function() { | |
| 99 // The use of a timeout is in order to reduce flickering as we move | |
| 100 // between valid drop targets. | |
| 101 window.clearTimeout(removeDropIndicatorTimer); | |
| 102 removeDropIndicatorTimer = window.setTimeout(function() { | |
| 103 dropIndicator.removeDropIndicatorStyle(); | |
| 104 }, 100); | |
| 105 } | |
| 106 }; | |
| 107 | |
| 108 /** | |
| 109 * Delay for expanding folder when pointer hovers on folder in tree view in | |
| 110 * milliseconds. | |
| 111 * @type {number} | |
| 112 * @const | |
| 113 */ | |
| 114 // TODO(yosin): EXPAND_FOLDER_DELAY should follow system settings. 400ms is | |
| 115 // taken from Windows default settings. | |
| 116 var EXPAND_FOLDER_DELAY = 400; | |
| 117 | |
| 118 /** | |
| 119 * The timestamp when the mouse was over a folder during a drag operation. | |
| 120 * Used to open the hovered folder after a certain time. | |
| 121 * @type {number} | |
| 122 */ | |
| 123 var lastHoverOnFolderTimeStamp = 0; | |
| 124 | |
| 125 /** | |
| 126 * Expand a folder if the user has hovered for longer than the specified | |
| 127 * time during a drag action. | |
| 128 */ | |
| 129 function updateAutoExpander(eventTimeStamp, overElement) { | |
| 130 // Expands a folder in tree view when pointer hovers on it longer than | |
| 131 // EXPAND_FOLDER_DELAY. | |
| 132 var hoverOnFolderTimeStamp = lastHoverOnFolderTimeStamp; | |
| 133 lastHoverOnFolderTimeStamp = 0; | |
| 134 if (hoverOnFolderTimeStamp) { | |
| 135 if (eventTimeStamp - hoverOnFolderTimeStamp >= EXPAND_FOLDER_DELAY) | |
| 136 overElement.expanded = true; | |
| 137 else | |
| 138 lastHoverOnFolderTimeStamp = hoverOnFolderTimeStamp; | |
| 139 } else if (overElement instanceof TreeItem && | |
| 140 bmm.isFolder(overElement.bookmarkNode) && | |
| 141 overElement.hasChildren && | |
| 142 !overElement.expanded) { | |
| 143 lastHoverOnFolderTimeStamp = eventTimeStamp; | |
| 144 } | |
| 145 } | |
| 146 | |
| 147 /** | |
| 148 * Stores the information abou the bookmark and folders being dragged. | |
| 149 * @type {Object} | |
| 150 */ | |
| 151 var dragData = null; | |
| 152 var dragInfo = { | |
| 153 handleChromeDragEnter: function(newDragData) { | |
| 154 dragData = newDragData; | |
| 155 }, | |
| 156 clearDragData: function() { | |
| 157 dragData = null; | |
| 158 }, | |
| 159 isDragValid: function() { | |
| 160 return !!dragData; | |
| 161 }, | |
| 162 isSameProfile: function() { | |
| 163 return dragData && dragData.sameProfile; | |
| 164 }, | |
| 165 isDraggingFolders: function() { | |
| 166 return dragData && dragData.elements.some(function(node) { | |
| 167 return !node.url; | |
| 168 }); | |
| 169 }, | |
| 170 isDraggingBookmark: function(bookmarkId) { | |
| 171 return dragData && dragData.elements.some(function(node) { | |
| 172 return node.id == bookmarkId; | |
| 173 }); | |
| 174 }, | |
| 175 isDraggingChildBookmark: function(folderId) { | |
| 176 return dragData && dragData.elements.some(function(node) { | |
| 177 return node.parentId == folderId; | |
| 178 }); | |
| 179 }, | |
| 180 isDraggingFolderToDescendant: function(bookmarkNode) { | |
| 181 return dragData && dragData.elements.some(function(node) { | |
| 182 var dragFolder = bmm.treeLookup[node.id]; | |
| 183 var dragFolderNode = dragFolder && dragFolder.bookmarkNode; | |
| 184 return dragFolderNode && bmm.contains(dragFolderNode, bookmarkNode); | |
| 185 }); | |
| 186 } | |
| 187 }; | |
| 188 | |
| 189 /** | |
| 190 * External function to select folders or bookmarks after a drop action. | |
| 191 * @type {function} | |
| 192 */ | |
| 193 var selectItemsAfterUserAction = null; | |
| 194 | |
| 195 function getBookmarkElement(el) { | |
| 196 while (el && !el.bookmarkNode) { | |
| 197 el = el.parentNode; | |
| 198 } | |
| 199 return el; | |
| 200 } | |
| 201 | |
| 202 // If we are over the list and the list is showing search result, we cannot | |
| 203 // drop. | |
| 204 function isOverSearch(overElement) { | |
| 205 return list.isSearch() && list.contains(overElement); | |
| 206 } | |
| 207 | |
| 208 /** | |
| 209 * Determines the valid drop positions for the given target element. | |
| 210 * @param {!HTMLElement} overElement The element that we are currently | |
| 211 * dragging over. | |
| 212 * @return {DropPosition} An bit field enumeration of valid drop locations. | |
| 213 */ | |
| 214 function calculateValidDropTargets(overElement) { | |
| 215 if (!dragInfo.isDragValid() || isOverSearch(overElement)) | |
| 216 return DropPosition.NONE; | |
| 217 | |
| 218 if (dragInfo.isSameProfile() && | |
| 219 (dragInfo.isDraggingBookmark(overElement.bookmarkNode.id) || | |
| 220 dragInfo.isDraggingFolderToDescendant(overElement.bookmarkNode))) { | |
| 221 return DropPosition.NONE; | |
| 222 } | |
| 223 | |
| 224 var canDropInfo = calculateDropAboveBelow(overElement); | |
| 225 if (canDropOn(overElement)) | |
| 226 canDropInfo |= DropPosition.ON; | |
| 227 | |
| 228 return canDropInfo; | |
| 229 } | |
| 230 | |
| 231 function calculateDropAboveBelow(overElement) { | |
| 232 if (overElement instanceof BookmarkList) | |
| 233 return DropPosition.NONE; | |
| 234 | |
| 235 // We cannot drop between Bookmarks bar and Other bookmarks. | |
| 236 if (overElement.bookmarkNode.parentId == bmm.ROOT_ID) | |
| 237 return DropPosition.NONE; | |
| 238 | |
| 239 var isOverTreeItem = overElement instanceof TreeItem; | |
| 240 var isOverExpandedTree = isOverTreeItem && overElement.expanded; | |
| 241 var isDraggingFolders = dragInfo.isDraggingFolders(); | |
| 242 | |
| 243 // We can only drop between items in the tree if we have any folders. | |
| 244 if (isOverTreeItem && !isDraggingFolders) | |
| 245 return DropPosition.NONE; | |
| 246 | |
| 247 // When dragging from a different profile we do not need to consider | |
| 248 // conflicts between the dragged items and the drop target. | |
| 249 if (!dragInfo.isSameProfile()) { | |
| 250 // Don't allow dropping below an expanded tree item since it is confusing | |
| 251 // to the user anyway. | |
| 252 return isOverExpandedTree ? DropPosition.ABOVE : | |
| 253 (DropPosition.ABOVE | DropPosition.BELOW); | |
| 254 } | |
| 255 | |
| 256 var resultPositions = DropPosition.NONE; | |
| 257 | |
| 258 // Cannot drop above if the item above is already in the drag source. | |
| 259 var previousElem = overElement.previousElementSibling; | |
| 260 if (!previousElem || !dragInfo.isDraggingBookmark(previousElem.bookmarkId)) | |
| 261 resultPositions |= DropPosition.ABOVE; | |
| 262 | |
| 263 // Don't allow dropping below an expanded tree item since it is confusing | |
| 264 // to the user anyway. | |
| 265 if (isOverExpandedTree) | |
| 266 return resultPositions; | |
| 267 | |
| 268 // Cannot drop below if the item below is already in the drag source. | |
| 269 var nextElement = overElement.nextElementSibling; | |
| 270 if (!nextElement || !dragInfo.isDraggingBookmark(nextElement.bookmarkId)) | |
| 271 resultPositions |= DropPosition.BELOW; | |
| 272 | |
| 273 return resultPositions; | |
| 274 } | |
| 275 | |
| 276 /** | |
| 277 * Determine whether we can drop the dragged items on the drop target. | |
| 278 * @param {!HTMLElement} overElement The element that we are currently | |
| 279 * dragging over. | |
| 280 * @return {boolean} Whether we can drop the dragged items on the drop | |
| 281 * target. | |
| 282 */ | |
| 283 function canDropOn(overElement) { | |
| 284 // We can only drop on a folder. | |
| 285 if (!bmm.isFolder(overElement.bookmarkNode)) | |
| 286 return false; | |
| 287 | |
| 288 if (!dragInfo.isSameProfile()) | |
| 289 return true; | |
| 290 | |
| 291 if (overElement instanceof BookmarkList) { | |
| 292 // We are trying to drop an item past the last item. This is | |
| 293 // only allowed if dragged item is different from the last item | |
| 294 // in the list. | |
| 295 var listItems = list.items; | |
| 296 var len = listItems.length; | |
| 297 if (!len || !dragInfo.isDraggingBookmark(listItems[len - 1].bookmarkId)) | |
| 298 return true; | |
| 299 } | |
| 300 | |
| 301 return !dragInfo.isDraggingChildBookmark(overElement.bookmarkNode.id); | |
| 302 } | |
| 303 | |
| 304 /** | |
| 305 * Callback for the dragstart event. | |
| 306 * @param {Event} e The dragstart event. | |
| 307 */ | |
| 308 function handleDragStart(e) { | |
| 309 // Determine the selected bookmarks. | |
| 310 var target = e.target; | |
| 311 var draggedNodes = []; | |
| 312 if (target instanceof ListItem) { | |
| 313 // Use selected items. | |
| 314 draggedNodes = target.parentNode.selectedItems; | |
| 315 } else if (target instanceof TreeItem) { | |
| 316 draggedNodes.push(target.bookmarkNode); | |
| 317 } | |
| 318 | |
| 319 // We manage starting the drag by using the extension API. | |
| 320 e.preventDefault(); | |
| 321 | |
| 322 if (draggedNodes.length) { | |
| 323 // If we are dragging a single link, we can do the *Link* effect. | |
| 324 // Otherwise, we only allow copy and move. | |
| 325 e.dataTransfer.effectAllowed = draggedNodes.length == 1 && | |
| 326 !bmm.isFolder(draggedNodes[0]) ? 'copyMoveLink' : 'copyMove'; | |
| 327 | |
| 328 chrome.bookmarkManagerPrivate.startDrag(draggedNodes.map(function(node) { | |
| 329 return node.id; | |
| 330 })); | |
| 331 } | |
| 332 } | |
| 333 | |
| 334 function handleDragEnter(e) { | |
| 335 e.preventDefault(); | |
| 336 } | |
| 337 | |
| 338 /** | |
| 339 * Calback for the dragover event. | |
| 340 * @param {Event} e The dragover event. | |
| 341 */ | |
| 342 function handleDragOver(e) { | |
| 343 // Allow DND on text inputs. | |
| 344 if (e.target.tagName != 'INPUT') { | |
| 345 // The default operation is to allow dropping links etc to do navigation. | |
| 346 // We never want to do that for the bookmark manager. | |
| 347 e.preventDefault(); | |
| 348 | |
| 349 // Set to none. This will get set to something if we can do the drop. | |
| 350 e.dataTransfer.dropEffect = 'none'; | |
| 351 } | |
| 352 | |
| 353 if (!dragInfo.isDragValid()) | |
| 354 return; | |
| 355 | |
| 356 var overElement = getBookmarkElement(e.target) || | |
| 357 (e.target == list ? list : null); | |
| 358 if (!overElement) | |
| 359 return; | |
| 360 | |
| 361 updateAutoExpander(e.timeStamp, overElement); | |
| 362 | |
| 363 var canDropInfo = calculateValidDropTargets(overElement); | |
| 364 if (canDropInfo == DropPosition.NONE) | |
| 365 return; | |
| 366 | |
| 367 // Now we know that we can drop. Determine if we will drop above, on or | |
| 368 // below based on mouse position etc. | |
| 369 | |
| 370 dropDestination = calcDropPosition(e.clientY, overElement, canDropInfo); | |
| 371 if (!dropDestination) { | |
| 372 e.dataTransfer.dropEffect = 'none'; | |
| 373 return; | |
| 374 } | |
| 375 | |
| 376 e.dataTransfer.dropEffect = dragInfo.isSameProfile() ? 'move' : 'copy'; | |
| 377 dropIndicator.update(dropDestination); | |
| 378 } | |
| 379 | |
| 380 /** | |
| 381 * This function determines where the drop will occur relative to the element. | |
| 382 * @return {?Object} If no valid drop position is found, null, otherwise | |
| 383 * an object containing the following parameters: | |
| 384 * element - The target element that will receive the drop. | |
| 385 * position - A |DropPosition| relative to the |element|. | |
| 386 */ | |
| 387 function calcDropPosition(elementClientY, overElement, canDropInfo) { | |
| 388 if (overElement instanceof BookmarkList) { | |
| 389 // Dropping on the BookmarkList either means dropping below the last | |
| 390 // bookmark element or on the list itself if it is empty. | |
| 391 var length = overElement.items.length; | |
| 392 if (length) | |
| 393 return { | |
| 394 element: overElement.getListItemByIndex(length - 1), | |
| 395 position: DropPosition.BELOW | |
| 396 }; | |
| 397 return {element: overElement, position: DropPosition.ON}; | |
| 398 } | |
| 399 | |
| 400 var above = canDropInfo & DropPosition.ABOVE; | |
| 401 var below = canDropInfo & DropPosition.BELOW; | |
| 402 var on = canDropInfo & DropPosition.ON; | |
| 403 var rect = overElement.getBoundingClientRect(); | |
| 404 var yRatio = (elementClientY - rect.top) / rect.height; | |
| 405 | |
| 406 if (above && (yRatio <= .25 || yRatio <= .5 && (!below || !on))) | |
| 407 return {element: overElement, position: DropPosition.ABOVE}; | |
| 408 if (below && (yRatio > .75 || yRatio > .5 && (!above || !on))) | |
| 409 return {element: overElement, position: DropPosition.BELOW}; | |
| 410 if (on) | |
| 411 return {element: overElement, position: DropPosition.ON}; | |
| 412 return null; | |
| 413 } | |
| 414 | |
| 415 function calculateDropInfo(eventTarget, dropDestination) { | |
| 416 if (!dropDestination || !dragInfo.isDragValid()) | |
| 417 return null; | |
| 418 | |
| 419 var dropPos = dropDestination.position; | |
| 420 var relatedNode = dropDestination.element.bookmarkNode; | |
| 421 var dropInfoResult = { | |
| 422 selectTarget: null, | |
| 423 selectedTreeId: -1, | |
| 424 parentId: dropPos == DropPosition.ON ? relatedNode.id : | |
| 425 relatedNode.parentId, | |
| 426 index: -1, | |
| 427 relatedIndex: -1 | |
| 428 }; | |
| 429 | |
| 430 // Try to find the index in the dataModel so we don't have to always keep | |
| 431 // the index for the list items up to date. | |
| 432 var overElement = getBookmarkElement(eventTarget); | |
| 433 if (overElement instanceof ListItem) { | |
| 434 dropInfoResult.relatedIndex = | |
| 435 overElement.parentNode.dataModel.indexOf(relatedNode); | |
| 436 dropInfoResult.selectTarget = list; | |
| 437 } else if (overElement instanceof BookmarkList) { | |
| 438 dropInfoResult.relatedIndex = overElement.dataModel.length - 1; | |
| 439 dropInfoResult.selectTarget = list; | |
| 440 } else { | |
| 441 // Tree | |
| 442 dropInfoResult.relatedIndex = relatedNode.index; | |
| 443 dropInfoResult.selectTarget = tree; | |
| 444 dropInfoResult.selectedTreeId = | |
| 445 tree.selectedItem ? tree.selectedItem.bookmarkId : null; | |
| 446 } | |
| 447 | |
| 448 if (dropPos == DropPosition.ABOVE) | |
| 449 dropInfoResult.index = dropInfoResult.relatedIndex; | |
| 450 else if (dropPos == DropPosition.BELOW) | |
| 451 dropInfoResult.index = dropInfoResult.relatedIndex + 1; | |
| 452 | |
| 453 return dropInfoResult; | |
| 454 } | |
| 455 | |
| 456 function handleDragLeave(e) { | |
| 457 dropIndicator.finish(); | |
| 458 } | |
| 459 | |
| 460 function handleDrop(e) { | |
| 461 var dropInfo = calculateDropInfo(e.target, dropDestination); | |
| 462 if (dropInfo) { | |
| 463 selectItemsAfterUserAction(dropInfo.selectTarget, | |
| 464 dropInfo.selectedTreeId); | |
| 465 if (dropInfo.index != -1) | |
| 466 chrome.bookmarkManagerPrivate.drop(dropInfo.parentId, dropInfo.index); | |
| 467 else | |
| 468 chrome.bookmarkManagerPrivate.drop(dropInfo.parentId); | |
| 469 | |
| 470 e.preventDefault(); | |
| 471 } | |
| 472 dropDestination = null; | |
| 473 dropIndicator.finish(); | |
| 474 } | |
| 475 | |
| 476 function clearDragData() { | |
| 477 dragInfo.clearDragData(); | |
| 478 dropDestination = null; | |
| 479 } | |
| 480 | |
| 481 function init(selectItemsAfterUserActionFunction) { | |
| 482 function deferredClearData() { | |
| 483 setTimeout(clearDragData); | |
| 484 } | |
| 485 | |
| 486 selectItemsAfterUserAction = selectItemsAfterUserActionFunction; | |
| 487 | |
| 488 document.addEventListener('dragstart', handleDragStart); | |
| 489 document.addEventListener('dragenter', handleDragEnter); | |
| 490 document.addEventListener('dragover', handleDragOver); | |
| 491 document.addEventListener('dragleave', handleDragLeave); | |
| 492 document.addEventListener('drop', handleDrop); | |
| 493 document.addEventListener('dragend', deferredClearData); | |
| 494 document.addEventListener('mouseup', deferredClearData); | |
| 495 | |
| 496 chrome.bookmarkManagerPrivate.onDragEnter.addListener( | |
| 497 dragInfo.handleChromeDragEnter); | |
| 498 chrome.bookmarkManagerPrivate.onDragLeave.addListener(deferredClearData); | |
| 499 chrome.bookmarkManagerPrivate.onDrop.addListener(deferredClearData); | |
| 500 } | |
| 501 return {init: init}; | |
| 502 }); | |
| OLD | NEW |
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Chromium Code Reviews
Issue 200063003:
Remove enhanced bookmarks extension (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src