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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
Polymer({
is: 'viewer-zoom-button',
properties: {
/** Index of the icon currently being displayed. */
activeIndex: {
type: Number,
value: 0,
},
delay: {
type: Number,
observer: 'delayChanged_',
},
/**
* Icons to be displayed on the FAB. Multiple icons should be separated with
* spaces, and will be cycled through every time the FAB is clicked.
*/
icons: String,
/**
* Used to show the appropriate drop shadow when buttons are focused with
* the keyboard.
*/
keyboardNavigationActive: {
type: Boolean,
reflectToAttribute: true,
},
newPrintPreview: {
type: Boolean,
reflectToAttribute: true,
},
showOnLeft: {
type: Boolean,
reflectToAttribute: true,
},
/** @type {?Array<string>} */
tooltips: Array,
/** @private */
closed_: {
type: Boolean,
reflectToAttribute: true,
value: false,
},
/**
* Array version of the list of icons. Polymer does not allow array
* properties to be set from HTML, so we must use a string property and
* perform the conversion manually.
* @private {!Array<string>}
*/
icons_: {
type: Array,
value: [''],
computed: 'computeIconsArray_(icons)',
},
/**
* Icon currently being displayed on the FAB.
* @private
*/
visibleIcon_: {
type: String,
computed: 'computeVisibleIcon_(icons_, activeIndex)',
},
/** @private */
visibleTooltip_: {
type: String,
computed: 'computeVisibleTooltip_(tooltips, activeIndex)',
}
},
/**
* @param {string} icons Icon names in a string, delimited by spaces
* @return {!Array<string>} Array of icon name strings
* @private
*/
computeIconsArray_: function(icons) {
return icons.split(' ');
},
/**
* @param {!Array<string>} icons Array of icon name strings.
* @param {number} activeIndex Index of the currently active icon.
* @return {string} Icon name for the currently visible icon.
* @private
*/
computeVisibleIcon_: function(icons, activeIndex) {
return icons[activeIndex];
},
/**
* @param {?Array<string>} tooltips Array of tooltip strings.
* @param {number} activeIndex Index of the currently active icon.
* @return {string} Tooltip for the currently visible icon.
* @private
*/
computeVisibleTooltip_: function(tooltips, activeIndex) {
return tooltips === undefined ? '' : tooltips[activeIndex];
},
/** @private */
delayChanged_: function() {
this.$.wrapper.style.transitionDelay = this.delay + 'ms';
},
show: function() {
this.closed_ = false;
},
hide: function() {
this.closed_ = true;
},
/** @private */
fireClick_: function() {
// We cannot attach an on-click to the entire viewer-zoom-button, as this
// will include clicks on the margins. Instead, proxy clicks on the FAB
// through.
this.fire('fabclick');
this.activeIndex = (this.activeIndex + 1) % this.icons_.length;
}
});
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