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Issue 814573004: Fix for Multipage selection by dragging mouse in OOP case in PDF. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Changes as per review comments. Created 5 years, 10 months ago
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1 // Copyright 2015 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 /**
6 * Creates a new ViewportScroller.
7 * A ViewportScroller scrolls the page in response to drag selection with the
8 * mouse.
9 * @param {Object} viewport The viewport info of the page.
10 * @param {Object} plugin The plugin object of PDF.
raymes 2015/02/12 06:22:31 nit "The PDF plugin element."
Deepak 2015/02/12 08:28:32 Done.
11 * @param {Object} window The window object for PDF.
raymes 2015/02/12 06:22:31 nit: "The window containing the viewer."
Deepak 2015/02/12 08:28:32 Done.
12 */
13 function ViewportScroller(viewport, plugin, window) {
14 this.viewport_ = viewport;
15 this.plugin_ = plugin;
16 this.window_ = window;
17 this.mousemoveCallback_ = null;
18 this.timerId_ = null;
19 this.scrollVelocity_ = null;
20 // The period of time to wait between updating the viewport position by the
21 // scroll velocity.
22 this.DRAG_TIMER_INTERVAL = 100;
Sam McNally 2015/02/12 06:27:44 I meant add a trailing underscore, not turn them i
Deepak 2015/02/12 08:28:32 Done.
23 // The maximum drag scroll velocity.
24 this.MAX_DRAG_SCROLL_VELOCITY = 100;
25 }
26
27 ViewportScroller.prototype = {
28 /**
29 * @private
30 * Start scrolling the page by |scrollVelocity_| every |DRAG_TIMER_INTERVAL|.
31 */
32 startDragScrollTimer_: function() {
33 if (this.timerId_ === null) {
34 this.timerId_ = this.window_.setInterval(this.dragScrollPage_.bind(this),
35 this.DRAG_TIMER_INTERVAL);
36 }
37 },
38
39 /**
40 * @private
41 * Stops the drag scroll timer if it is active.
42 */
43 stopDragScrollTimer_: function() {
44 if (this.timerId_ !== null) {
45 this.window_.clearInterval(this.timerId_);
46 this.timerId_ = null;
47 }
48 },
49
50 /**
51 * @private
52 * Scrolls the viewport by the current scroll velocity.
53 */
54 dragScrollPage_: function() {
55 var position = this.viewport_.position;
56 position.y += this.scrollVelocity_.y;
57 position.x += this.scrollVelocity_.x;
58 this.viewport_.position = position;
59 },
60
61 /**
62 * @private
63 * Calculate the velocity to scroll while dragging using the distance of the
64 * cursor outside the viewport.
Sam McNally 2015/02/12 06:27:45 @param for event
Deepak 2015/02/12 08:28:32 Done.
65 * @return {Object} Object with x and y direction scroll velocity.
66 */
67 calculateVelocity_: function(event) {
68 var x = Math.min(Math.max(-event.offsetX,
69 event.offsetX - this.plugin_.offsetWidth, 0),
70 this.MAX_DRAG_SCROLL_VELOCITY) *
71 Math.sign(event.offsetX);
72 var y = Math.min(Math.max(-event.offsetY,
73 event.offsetY - this.plugin_.offsetHeight, 0),
74 this.MAX_DRAG_SCROLL_VELOCITY) *
75 Math.sign(event.offsetY);
76 return {
77 x: x,
78 y: y
79 };
80 },
81
82 /**
83 * @private
84 * Handles mousemove events. It updates the scroll velocity and starts and
85 * stops timer based on scroll velocity.
86 * @param {Object} event The mousemove event.
87 */
88 onMousemove_: function(event) {
89 this.scrollVelocity_ = this.calculateVelocity_(event);
90 if (!this.scrollVelocity_.x && !this.scrollVelocity_.y)
91 this.stopDragScrollTimer_();
92 else if (!this.timerId_)
93 this.startDragScrollTimer_();
94 },
95
96 /**
97 * Sets whether to scroll the viewport when the mouse is outside the
98 * viewport.
99 * @param {boolean} isSelecting Represents selection status.
100 */
101 setEnableScrolling: function(isSelecting) {
102 if (isSelecting) {
103 if (!this.mousemoveCallback_)
104 this.mousemoveCallback_ = this.onMousemove_.bind(this);
105 this.plugin_.addEventListener('mousemove', this.mousemoveCallback_,
106 false);
107 } else {
108 this.stopDragScrollTimer_();
109 if (this.mousemoveCallback_) {
110 this.plugin_.removeEventListener('mousemove', this.mousemoveCallback_,
111 false);
112 }
113 }
114 }
115 };
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