1 | /**
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2 | * @license
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3 | * Copyright 2018 Google Inc.
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4 | *
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5 | * Permission is hereby granted, free of charge, to any person obtaining a copy
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6 | * of this software and associated documentation files (the "Software"), to deal
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7 | * in the Software without restriction, including without limitation the rights
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8 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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9 | * copies of the Software, and to permit persons to whom the Software is
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10 | * furnished to do so, subject to the following conditions:
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11 | *
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12 | * The above copyright notice and this permission notice shall be included in
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13 | * all copies or substantial portions of the Software.
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14 | *
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15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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16 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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18 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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19 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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20 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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21 | * THE SOFTWARE.
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22 | */
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23 | import { __extends } from "tslib";
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24 | import { numbers } from '../constants';
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25 | import { MDCTopAppBarBaseFoundation } from '../foundation';
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26 | var INITIAL_VALUE = 0;
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27 | var MDCTopAppBarFoundation = /** @class */ (function (_super) {
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28 | __extends(MDCTopAppBarFoundation, _super);
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29 | /* istanbul ignore next: optional argument is not a branch statement */
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30 | function MDCTopAppBarFoundation(adapter) {
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31 | var _this = _super.call(this, adapter) || this;
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32 | /**
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33 | * Indicates if the top app bar was docked in the previous scroll handler iteration.
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34 | */
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35 | _this.wasDocked = true;
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36 | /**
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37 | * Indicates if the top app bar is docked in the fully shown position.
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38 | */
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39 | _this.isDockedShowing = true;
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40 | /**
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41 | * Variable for current scroll position of the top app bar
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42 | */
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43 | _this.currentAppBarOffsetTop = 0;
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44 | /**
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45 | * Used to prevent the top app bar from being scrolled out of view during resize events
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46 | */
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47 | _this.isCurrentlyBeingResized = false;
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48 | /**
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49 | * The timeout that's used to throttle the resize events
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50 | */
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51 | _this.resizeThrottleId = INITIAL_VALUE;
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52 | /**
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53 | * The timeout that's used to debounce toggling the isCurrentlyBeingResized
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54 | * variable after a resize
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55 | */
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56 | _this.resizeDebounceId = INITIAL_VALUE;
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57 | _this.lastScrollPosition = _this.adapter.getViewportScrollY();
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58 | _this.topAppBarHeight = _this.adapter.getTopAppBarHeight();
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59 | return _this;
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60 | }
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61 | MDCTopAppBarFoundation.prototype.destroy = function () {
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62 | _super.prototype.destroy.call(this);
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63 | this.adapter.setStyle('top', '');
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64 | };
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65 | /**
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66 | * Scroll handler for the default scroll behavior of the top app bar.
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67 | * @override
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68 | */
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69 | MDCTopAppBarFoundation.prototype.handleTargetScroll = function () {
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70 | var currentScrollPosition = Math.max(this.adapter.getViewportScrollY(), 0);
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71 | var diff = currentScrollPosition - this.lastScrollPosition;
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72 | this.lastScrollPosition = currentScrollPosition;
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73 | // If the window is being resized the lastScrollPosition needs to be updated
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74 | // but the current scroll of the top app bar should stay in the same
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75 | // position.
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76 | if (!this.isCurrentlyBeingResized) {
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77 | this.currentAppBarOffsetTop -= diff;
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78 | if (this.currentAppBarOffsetTop > 0) {
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79 | this.currentAppBarOffsetTop = 0;
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80 | }
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81 | else if (Math.abs(this.currentAppBarOffsetTop) > this.topAppBarHeight) {
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82 | this.currentAppBarOffsetTop = -this.topAppBarHeight;
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83 | }
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84 | this.moveTopAppBar();
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85 | }
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86 | };
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87 | /**
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88 | * Top app bar resize handler that throttle/debounce functions that execute updates.
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89 | * @override
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90 | */
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91 | MDCTopAppBarFoundation.prototype.handleWindowResize = function () {
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92 | var _this = this;
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93 | // Throttle resize events 10 p/s
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94 | if (!this.resizeThrottleId) {
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95 | this.resizeThrottleId = setTimeout(function () {
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96 | _this.resizeThrottleId = INITIAL_VALUE;
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97 | _this.throttledResizeHandler();
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98 | }, numbers.DEBOUNCE_THROTTLE_RESIZE_TIME_MS);
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99 | }
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100 | this.isCurrentlyBeingResized = true;
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101 | if (this.resizeDebounceId) {
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102 | clearTimeout(this.resizeDebounceId);
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103 | }
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104 | this.resizeDebounceId = setTimeout(function () {
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105 | _this.handleTargetScroll();
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106 | _this.isCurrentlyBeingResized = false;
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107 | _this.resizeDebounceId = INITIAL_VALUE;
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108 | }, numbers.DEBOUNCE_THROTTLE_RESIZE_TIME_MS);
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109 | };
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110 | /**
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111 | * Function to determine if the DOM needs to update.
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112 | */
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113 | MDCTopAppBarFoundation.prototype.checkForUpdate = function () {
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114 | var offscreenBoundaryTop = -this.topAppBarHeight;
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115 | var hasAnyPixelsOffscreen = this.currentAppBarOffsetTop < 0;
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116 | var hasAnyPixelsOnscreen = this.currentAppBarOffsetTop > offscreenBoundaryTop;
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117 | var partiallyShowing = hasAnyPixelsOffscreen && hasAnyPixelsOnscreen;
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118 | // If it's partially showing, it can't be docked.
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119 | if (partiallyShowing) {
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120 | this.wasDocked = false;
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121 | }
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122 | else {
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123 | // Not previously docked and not partially showing, it's now docked.
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124 | if (!this.wasDocked) {
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125 | this.wasDocked = true;
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126 | return true;
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127 | }
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128 | else if (this.isDockedShowing !== hasAnyPixelsOnscreen) {
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129 | this.isDockedShowing = hasAnyPixelsOnscreen;
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130 | return true;
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131 | }
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132 | }
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133 | return partiallyShowing;
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134 | };
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135 | /**
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136 | * Function to move the top app bar if needed.
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137 | */
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138 | MDCTopAppBarFoundation.prototype.moveTopAppBar = function () {
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139 | if (this.checkForUpdate()) {
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140 | // Once the top app bar is fully hidden we use the max potential top app bar height as our offset
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141 | // so the top app bar doesn't show if the window resizes and the new height > the old height.
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142 | var offset = this.currentAppBarOffsetTop;
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143 | if (Math.abs(offset) >= this.topAppBarHeight) {
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144 | offset = -numbers.MAX_TOP_APP_BAR_HEIGHT;
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145 | }
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146 | this.adapter.setStyle('top', offset + 'px');
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147 | }
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148 | };
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149 | /**
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150 | * Throttled function that updates the top app bar scrolled values if the
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151 | * top app bar height changes.
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152 | */
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153 | MDCTopAppBarFoundation.prototype.throttledResizeHandler = function () {
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154 | var currentHeight = this.adapter.getTopAppBarHeight();
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155 | if (this.topAppBarHeight !== currentHeight) {
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156 | this.wasDocked = false;
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157 | // Since the top app bar has a different height depending on the screen width, this
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158 | // will ensure that the top app bar remains in the correct location if
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159 | // completely hidden and a resize makes the top app bar a different height.
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160 | this.currentAppBarOffsetTop -= this.topAppBarHeight - currentHeight;
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161 | this.topAppBarHeight = currentHeight;
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162 | }
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163 | this.handleTargetScroll();
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164 | };
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165 | return MDCTopAppBarFoundation;
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166 | }(MDCTopAppBarBaseFoundation));
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167 | export { MDCTopAppBarFoundation };
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168 | // tslint:disable-next-line:no-default-export Needed for backward compatibility with MDC Web v0.44.0 and earlier.
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169 | export default MDCTopAppBarFoundation;
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170 | //# sourceMappingURL=foundation.js.map |
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