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| 1 | |
| 2 | |
| 3 /* | |
| 4 Use `Polymer.PaperDialogBehavior` and `paper-dialog-common.css` to implement a M
aterial Design | |
| 5 dialog. | |
| 6 | |
| 7 For example, if `<paper-dialog-impl>` implements this behavior: | |
| 8 | |
| 9 <paper-dialog-impl> | |
| 10 <h2>Header</h2> | |
| 11 <div>Dialog body</div> | |
| 12 <div class="buttons"> | |
| 13 <paper-button dialog-dismiss>Cancel</paper-button> | |
| 14 <paper-button dialog-confirm>Accept</paper-button> | |
| 15 </div> | |
| 16 </paper-dialog-impl> | |
| 17 | |
| 18 `paper-dialog-common.css` provide styles for a header, content area, and an acti
on area for buttons. | |
| 19 Use the `<h2>` tag for the header and the `buttons` class for the action area. Y
ou can use the | |
| 20 `paper-dialog-scrollable` element (in its own repository) if you need a scrollin
g content area. | |
| 21 | |
| 22 Use the `dialog-dismiss` and `dialog-confirm` attributes on interactive controls
to close the | |
| 23 dialog. If the user dismisses the dialog with `dialog-confirm`, the `closingReas
on` will update | |
| 24 to include `confirmed: true`. | |
| 25 | |
| 26 ### Styling | |
| 27 | |
| 28 The following custom properties and mixins are available for styling. | |
| 29 | |
| 30 Custom property | Description | Default | |
| 31 ----------------|-------------|---------- | |
| 32 `--paper-dialog-background-color` | Dialog background color
| `--primary-background-color` | |
| 33 `--paper-dialog-color` | Dialog foreground color
| `--primary-text-color` | |
| 34 `--paper-dialog` | Mixin applied to the dialog
| `{}` | |
| 35 `--paper-dialog-title` | Mixin applied to the title (`<h2>`) element
| `{}` | |
| 36 `--paper-dialog-button-color` | Button area foreground color
| `--default-primary-color` | |
| 37 | |
| 38 ### Accessibility | |
| 39 | |
| 40 This element has `role="dialog"` by default. Depending on the context, it may be
more appropriate | |
| 41 to override this attribute with `role="alertdialog"`. The header (a `<h2>` eleme
nt) will | |
| 42 | |
| 43 If `modal` is set, the element will set `aria-modal` and prevent the focus from
exiting the element. | |
| 44 It will also ensure that focus remains in the dialog. | |
| 45 | |
| 46 The `aria-labelledby` attribute will be set to the header element, if one exists
. | |
| 47 | |
| 48 @hero hero.svg | |
| 49 @demo demo/index.html | |
| 50 @polymerBehavior Polymer.PaperDialogBehavior | |
| 51 */ | |
| 52 | |
| 53 Polymer.PaperDialogBehaviorImpl = { | |
| 54 | |
| 55 hostAttributes: { | |
| 56 'role': 'dialog', | |
| 57 'tabindex': '-1' | |
| 58 }, | |
| 59 | |
| 60 properties: { | |
| 61 | |
| 62 /** | |
| 63 * If `modal` is true, this implies `no-cancel-on-outside-click` and `with
-backdrop`. | |
| 64 */ | |
| 65 modal: { | |
| 66 observer: '_modalChanged', | |
| 67 type: Boolean, | |
| 68 value: false | |
| 69 }, | |
| 70 | |
| 71 _lastFocusedElement: { | |
| 72 type: Node | |
| 73 }, | |
| 74 | |
| 75 _boundOnFocus: { | |
| 76 type: Function, | |
| 77 value: function() { | |
| 78 return this._onFocus.bind(this); | |
| 79 } | |
| 80 }, | |
| 81 | |
| 82 _boundOnBackdropClick: { | |
| 83 type: Function, | |
| 84 value: function() { | |
| 85 return this._onBackdropClick.bind(this); | |
| 86 } | |
| 87 } | |
| 88 | |
| 89 }, | |
| 90 | |
| 91 listeners: { | |
| 92 'click': '_onDialogClick', | |
| 93 'iron-overlay-opened': '_onIronOverlayOpened', | |
| 94 'iron-overlay-closed': '_onIronOverlayClosed' | |
| 95 }, | |
| 96 | |
| 97 attached: function() { | |
| 98 this._observer = this._observe(this); | |
| 99 this._updateAriaLabelledBy(); | |
| 100 }, | |
| 101 | |
| 102 detached: function() { | |
| 103 if (this._observer) { | |
| 104 this._observer.disconnect(); | |
| 105 } | |
| 106 }, | |
| 107 | |
| 108 _observe: function(node) { | |
| 109 var observer = new MutationObserver(function() { | |
| 110 this._updateAriaLabelledBy(); | |
| 111 }.bind(this)); | |
| 112 observer.observe(node, { | |
| 113 childList: true, | |
| 114 subtree: true | |
| 115 }); | |
| 116 return observer; | |
| 117 }, | |
| 118 | |
| 119 _modalChanged: function() { | |
| 120 if (this.modal) { | |
| 121 this.setAttribute('aria-modal', 'true'); | |
| 122 } else { | |
| 123 this.setAttribute('aria-modal', 'false'); | |
| 124 } | |
| 125 // modal implies noCancelOnOutsideClick and withBackdrop if true, don't ov
erwrite | |
| 126 // those properties otherwise. | |
| 127 if (this.modal) { | |
| 128 this.noCancelOnOutsideClick = true; | |
| 129 this.withBackdrop = true; | |
| 130 } | |
| 131 }, | |
| 132 | |
| 133 _updateAriaLabelledBy: function() { | |
| 134 var header = Polymer.dom(this).querySelector('h2'); | |
| 135 if (!header) { | |
| 136 this.removeAttribute('aria-labelledby'); | |
| 137 return; | |
| 138 } | |
| 139 var headerId = header.getAttribute('id'); | |
| 140 if (headerId && this.getAttribute('aria-labelledby') === headerId) { | |
| 141 return; | |
| 142 } | |
| 143 // set aria-describedBy to the header element | |
| 144 var labelledById; | |
| 145 if (headerId) { | |
| 146 labelledById = headerId; | |
| 147 } else { | |
| 148 labelledById = 'paper-dialog-header-' + new Date().getUTCMilliseconds(); | |
| 149 header.setAttribute('id', labelledById); | |
| 150 } | |
| 151 this.setAttribute('aria-labelledby', labelledById); | |
| 152 }, | |
| 153 | |
| 154 _updateClosingReasonConfirmed: function(confirmed) { | |
| 155 this.closingReason = this.closingReason || {}; | |
| 156 this.closingReason.confirmed = confirmed; | |
| 157 }, | |
| 158 | |
| 159 _onDialogClick: function(event) { | |
| 160 var target = event.target; | |
| 161 while (target !== this) { | |
| 162 if (target.hasAttribute('dialog-dismiss')) { | |
| 163 this._updateClosingReasonConfirmed(false); | |
| 164 this.close(); | |
| 165 break; | |
| 166 } else if (target.hasAttribute('dialog-confirm')) { | |
| 167 this._updateClosingReasonConfirmed(true); | |
| 168 this.close(); | |
| 169 break; | |
| 170 } | |
| 171 target = target.parentNode; | |
| 172 } | |
| 173 }, | |
| 174 | |
| 175 _onIronOverlayOpened: function() { | |
| 176 if (this.modal) { | |
| 177 document.body.addEventListener('focus', this._boundOnFocus, true); | |
| 178 this.backdropElement.addEventListener('click', this._boundOnBackdropClic
k); | |
| 179 } | |
| 180 }, | |
| 181 | |
| 182 _onIronOverlayClosed: function() { | |
| 183 document.body.removeEventListener('focus', this._boundOnFocus, true); | |
| 184 this.backdropElement.removeEventListener('click', this._boundOnBackdropCli
ck); | |
| 185 }, | |
| 186 | |
| 187 _onFocus: function(event) { | |
| 188 if (this.modal) { | |
| 189 var target = event.target; | |
| 190 while (target && target !== this && target !== document.body) { | |
| 191 target = target.parentNode; | |
| 192 } | |
| 193 if (target) { | |
| 194 if (target === document.body) { | |
| 195 if (this._lastFocusedElement) { | |
| 196 this._lastFocusedElement.focus(); | |
| 197 } else { | |
| 198 this._focusNode.focus(); | |
| 199 } | |
| 200 } else { | |
| 201 this._lastFocusedElement = event.target; | |
| 202 } | |
| 203 } | |
| 204 } | |
| 205 }, | |
| 206 | |
| 207 _onBackdropClick: function() { | |
| 208 if (this.modal) { | |
| 209 if (this._lastFocusedElement) { | |
| 210 this._lastFocusedElement.focus(); | |
| 211 } else { | |
| 212 this._focusNode.focus(); | |
| 213 } | |
| 214 } | |
| 215 } | |
| 216 | |
| 217 }; | |
| 218 | |
| 219 /** @polymerBehavior */ | |
| 220 Polymer.PaperDialogBehavior = [Polymer.IronOverlayBehavior, Polymer.PaperDialo
gBehaviorImpl]; | |
| 221 | |
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