9c15c05596
Review-Url: https://codereview.chromium.org/729913004 Cr-Commit-Position: refs/heads/master@{#36351}
99 lines
2.6 KiB
JavaScript
99 lines
2.6 KiB
JavaScript
// Copyright 2015 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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var Selection = function(handler) {
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this.handler = handler;
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this.selectionBase = null;
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this.lastSelection = null;
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this.selection = new Set();
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}
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Selection.prototype.isEmpty = function() {
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return this.selection.size == 0;
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}
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Selection.prototype.clear = function() {
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var handler = this.handler;
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this.selectionBase = null;
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this.lastSelection = null;
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handler.select(this.selection, false);
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handler.clear();
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this.selection = new Set();
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}
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count = 0;
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Selection.prototype.select = function(s, selected) {
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var handler = this.handler;
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if (this.selection.has(s) && !selected) {
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handler.select([s], false);
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this.selection.delete(s);
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return;
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}
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if (selected) {
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this.selection.add(s);
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this.selectionBase = s;
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this.lastSelection = s;
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handler.select(this.selection, selected);
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}
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}
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Selection.prototype.extendTo = function(pos) {
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if (pos == this.lastSelection || this.lastSelection === null) return;
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var handler = this.handler;
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var pos_diff = handler.selectionDifference(pos, true, this.lastSelection, false);
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var unselect_diff = [];
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if (pos_diff.length == 0) {
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pos_diff = handler.selectionDifference(this.selectionBase, false, pos, true);
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if (pos_diff.length != 0) {
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unselect_diff = handler.selectionDifference(this.lastSelection, true, this.selectionBase, false);
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this.selection = new Set();
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this.selection.add(this.selectionBase);
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for (var d of pos_diff) {
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this.selection.add(d);
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}
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} else {
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unselect_diff = handler.selectionDifference(this.lastSelection, true, pos, false);
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for (var d of unselect_diff) {
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this.selection.delete(d);
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}
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}
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} else {
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unselect_diff = handler.selectionDifference(this.selectionBase, false, this.lastSelection, true);
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if (unselect_diff != 0) {
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pos_diff = handler.selectionDifference(pos, true, this.selectionBase, false);
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if (pos_diff.length == 0) {
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unselect_diff = handler.selectionDifference(pos, false, this.lastSelection, true);
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}
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for (var d of unselect_diff) {
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this.selection.delete(d);
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}
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}
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if (pos_diff.length != 0) {
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for (var d of pos_diff) {
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this.selection.add(d);
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}
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}
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}
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handler.select(unselect_diff, false);
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handler.select(pos_diff, true);
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this.lastSelection = pos;
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}
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Selection.prototype.detachSelection = function() {
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var result = new Set();
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for (var i of this.selection) {
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result.add(i);
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}
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this.clear();
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return result;
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}
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