OLD | NEW |
1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 /** | 5 /** |
6 * Returns the height of the intersection of two rectangles. | 6 * Returns the height of the intersection of two rectangles. |
7 * @param {Object} rect1 the first rect | 7 * @param {Object} rect1 the first rect |
8 * @param {Object} rect2 the second rect | 8 * @param {Object} rect2 the second rect |
9 * @return {number} the height of the intersection of the rects | 9 * @return {number} the height of the intersection of the rects |
10 */ | 10 */ |
11 function getIntersectionHeight(rect1, rect2) { | 11 function getIntersectionHeight(rect1, rect2) { |
12 return Math.max(0, | 12 return Math.max(0, |
13 Math.min(rect1.y + rect1.height, rect2.y + rect2.height) - | 13 Math.min(rect1.y + rect1.height, rect2.y + rect2.height) - |
14 Math.max(rect1.y, rect2.y)); | 14 Math.max(rect1.y, rect2.y)); |
15 } | 15 } |
16 | 16 |
17 /** | 17 /** |
18 * Create a new viewport. | 18 * Create a new viewport. |
19 * @constructor | 19 * @constructor |
20 * @param {Window} window the window | 20 * @param {Window} window the window |
21 * @param {Object} sizer is the element which represents the size of the | 21 * @param {Object} sizer is the element which represents the size of the |
22 * document in the viewport | 22 * document in the viewport |
23 * @param {Function} viewportChangedCallback is run when the viewport changes | 23 * @param {Function} viewportChangedCallback is run when the viewport changes |
24 * @param {Function} beforeZoomCallback is run before a change in zoom | 24 * @param {Function} beforeZoomCallback is run before a change in zoom |
25 * @param {Function} afterZoomCallback is run after a change in zoom | 25 * @param {Function} afterZoomCallback is run after a change in zoom |
26 * @param {number} scrollbarWidth the width of scrollbars on the page | 26 * @param {number} scrollbarWidth the width of scrollbars on the page |
| 27 * @param {number} yPos the offset of the viewport from the top of the window |
27 */ | 28 */ |
28 function Viewport(window, | 29 function Viewport(window, |
29 sizer, | 30 sizer, |
30 viewportChangedCallback, | 31 viewportChangedCallback, |
31 beforeZoomCallback, | 32 beforeZoomCallback, |
32 afterZoomCallback, | 33 afterZoomCallback, |
33 scrollbarWidth) { | 34 scrollbarWidth, |
| 35 yPos) { |
34 this.window_ = window; | 36 this.window_ = window; |
35 this.sizer_ = sizer; | 37 this.sizer_ = sizer; |
36 this.viewportChangedCallback_ = viewportChangedCallback; | 38 this.viewportChangedCallback_ = viewportChangedCallback; |
37 this.beforeZoomCallback_ = beforeZoomCallback; | 39 this.beforeZoomCallback_ = beforeZoomCallback; |
38 this.afterZoomCallback_ = afterZoomCallback; | 40 this.afterZoomCallback_ = afterZoomCallback; |
39 this.allowedToChangeZoom_ = false; | 41 this.allowedToChangeZoom_ = false; |
40 this.zoom_ = 1; | 42 this.zoom_ = 1; |
41 this.documentDimensions_ = null; | 43 this.documentDimensions_ = null; |
42 this.pageDimensions_ = []; | 44 this.pageDimensions_ = []; |
43 this.scrollbarWidth_ = scrollbarWidth; | 45 this.scrollbarWidth_ = scrollbarWidth; |
44 this.fittingType_ = Viewport.FittingType.NONE; | 46 this.fittingType_ = Viewport.FittingType.NONE; |
| 47 this.yPos = yPos; |
45 | 48 |
46 window.addEventListener('scroll', this.updateViewport_.bind(this)); | 49 window.addEventListener('scroll', this.updateViewport_.bind(this)); |
47 window.addEventListener('resize', this.resize_.bind(this)); | 50 window.addEventListener('resize', this.resize_.bind(this)); |
48 } | 51 } |
49 | 52 |
50 /** | 53 /** |
51 * Enumeration of page fitting types. | 54 * Enumeration of page fitting types. |
52 * @enum {string} | 55 * @enum {string} |
53 */ | 56 */ |
54 Viewport.FittingType = { | 57 Viewport.FittingType = { |
(...skipping 75 matching lines...) Expand 10 before | Expand all | Expand 10 after Loading... |
130 | 133 |
131 /** | 134 /** |
132 * @private | 135 * @private |
133 * Helper function called when the zoomed document size changes. | 136 * Helper function called when the zoomed document size changes. |
134 */ | 137 */ |
135 contentSizeChanged_: function() { | 138 contentSizeChanged_: function() { |
136 if (this.documentDimensions_) { | 139 if (this.documentDimensions_) { |
137 this.sizer_.style.width = | 140 this.sizer_.style.width = |
138 this.documentDimensions_.width * this.zoom_ + 'px'; | 141 this.documentDimensions_.width * this.zoom_ + 'px'; |
139 this.sizer_.style.height = | 142 this.sizer_.style.height = |
140 this.documentDimensions_.height * this.zoom_ + 'px'; | 143 this.documentDimensions_.height * this.zoom_ + this.yPos + 'px'; |
141 } | 144 } |
142 }, | 145 }, |
143 | 146 |
144 /** | 147 /** |
145 * @private | 148 * @private |
146 * Called when the viewport should be updated. | 149 * Called when the viewport should be updated. |
147 */ | 150 */ |
148 updateViewport_: function() { | 151 updateViewport_: function() { |
149 this.viewportChangedCallback_(); | 152 this.viewportChangedCallback_(); |
150 }, | 153 }, |
(...skipping 390 matching lines...) Expand 10 before | Expand all | Expand 10 after Loading... |
541 spaceOnLeft = Math.max(spaceOnLeft, 0); | 544 spaceOnLeft = Math.max(spaceOnLeft, 0); |
542 | 545 |
543 return { | 546 return { |
544 x: x * this.zoom_ + spaceOnLeft - this.window_.pageXOffset, | 547 x: x * this.zoom_ + spaceOnLeft - this.window_.pageXOffset, |
545 y: insetDimensions.y * this.zoom_ - this.window_.pageYOffset, | 548 y: insetDimensions.y * this.zoom_ - this.window_.pageYOffset, |
546 width: insetDimensions.width * this.zoom_, | 549 width: insetDimensions.width * this.zoom_, |
547 height: insetDimensions.height * this.zoom_ | 550 height: insetDimensions.height * this.zoom_ |
548 }; | 551 }; |
549 } | 552 } |
550 }; | 553 }; |
OLD | NEW |