openlayers
Version:
Build tools and sources for developing OpenLayers based mapping applications
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JavaScript
// FIXME handle date line wrap
goog.provide('ol.control.Attribution');
goog.require('ol');
goog.require('ol.dom');
goog.require('ol.control.Control');
goog.require('ol.css');
goog.require('ol.events');
goog.require('ol.events.EventType');
goog.require('ol.obj');
/**
* @classdesc
* Control to show all the attributions associated with the layer sources
* in the map. This control is one of the default controls included in maps.
* By default it will show in the bottom right portion of the map, but this can
* be changed by using a css selector for `.ol-attribution`.
*
* @constructor
* @extends {ol.control.Control}
* @param {olx.control.AttributionOptions=} opt_options Attribution options.
* @api stable
*/
ol.control.Attribution = function(opt_options) {
var options = opt_options ? opt_options : {};
/**
* @private
* @type {Element}
*/
this.ulElement_ = document.createElement('UL');
/**
* @private
* @type {Element}
*/
this.logoLi_ = document.createElement('LI');
this.ulElement_.appendChild(this.logoLi_);
this.logoLi_.style.display = 'none';
/**
* @private
* @type {boolean}
*/
this.collapsed_ = options.collapsed !== undefined ? options.collapsed : true;
/**
* @private
* @type {boolean}
*/
this.collapsible_ = options.collapsible !== undefined ?
options.collapsible : true;
if (!this.collapsible_) {
this.collapsed_ = false;
}
var className = options.className !== undefined ? options.className : 'ol-attribution';
var tipLabel = options.tipLabel !== undefined ? options.tipLabel : 'Attributions';
var collapseLabel = options.collapseLabel !== undefined ? options.collapseLabel : '\u00BB';
if (typeof collapseLabel === 'string') {
/**
* @private
* @type {Node}
*/
this.collapseLabel_ = document.createElement('span');
this.collapseLabel_.textContent = collapseLabel;
} else {
this.collapseLabel_ = collapseLabel;
}
var label = options.label !== undefined ? options.label : 'i';
if (typeof label === 'string') {
/**
* @private
* @type {Node}
*/
this.label_ = document.createElement('span');
this.label_.textContent = label;
} else {
this.label_ = label;
}
var activeLabel = (this.collapsible_ && !this.collapsed_) ?
this.collapseLabel_ : this.label_;
var button = document.createElement('button');
button.setAttribute('type', 'button');
button.title = tipLabel;
button.appendChild(activeLabel);
ol.events.listen(button, ol.events.EventType.CLICK, this.handleClick_, this);
var cssClasses = className + ' ' + ol.css.CLASS_UNSELECTABLE + ' ' +
ol.css.CLASS_CONTROL +
(this.collapsed_ && this.collapsible_ ? ' ol-collapsed' : '') +
(this.collapsible_ ? '' : ' ol-uncollapsible');
var element = document.createElement('div');
element.className = cssClasses;
element.appendChild(this.ulElement_);
element.appendChild(button);
var render = options.render ? options.render : ol.control.Attribution.render;
ol.control.Control.call(this, {
element: element,
render: render,
target: options.target
});
/**
* @private
* @type {boolean}
*/
this.renderedVisible_ = true;
/**
* @private
* @type {Object.<string, Element>}
*/
this.attributionElements_ = {};
/**
* @private
* @type {Object.<string, boolean>}
*/
this.attributionElementRenderedVisible_ = {};
/**
* @private
* @type {Object.<string, Element>}
*/
this.logoElements_ = {};
};
ol.inherits(ol.control.Attribution, ol.control.Control);
/**
* @param {?olx.FrameState} frameState Frame state.
* @return {Array.<Object.<string, ol.Attribution>>} Attributions.
*/
ol.control.Attribution.prototype.getSourceAttributions = function(frameState) {
var i, ii, j, jj, tileRanges, source, sourceAttribution,
sourceAttributionKey, sourceAttributions, sourceKey;
var intersectsTileRange;
var layerStatesArray = frameState.layerStatesArray;
/** @type {Object.<string, ol.Attribution>} */
var attributions = ol.obj.assign({}, frameState.attributions);
/** @type {Object.<string, ol.Attribution>} */
var hiddenAttributions = {};
var uniqueAttributions = {};
var projection = /** @type {!ol.proj.Projection} */ (frameState.viewState.projection);
for (i = 0, ii = layerStatesArray.length; i < ii; i++) {
source = layerStatesArray[i].layer.getSource();
if (!source) {
continue;
}
sourceKey = ol.getUid(source).toString();
sourceAttributions = source.getAttributions();
if (!sourceAttributions) {
continue;
}
for (j = 0, jj = sourceAttributions.length; j < jj; j++) {
sourceAttribution = sourceAttributions[j];
sourceAttributionKey = ol.getUid(sourceAttribution).toString();
if (sourceAttributionKey in attributions) {
continue;
}
tileRanges = frameState.usedTiles[sourceKey];
if (tileRanges) {
var tileGrid = /** @type {ol.source.Tile} */ (source).getTileGridForProjection(projection);
intersectsTileRange = sourceAttribution.intersectsAnyTileRange(
tileRanges, tileGrid, projection);
} else {
intersectsTileRange = false;
}
if (intersectsTileRange) {
if (sourceAttributionKey in hiddenAttributions) {
delete hiddenAttributions[sourceAttributionKey];
}
var html = sourceAttribution.getHTML();
if (!(html in uniqueAttributions)) {
uniqueAttributions[html] = true;
attributions[sourceAttributionKey] = sourceAttribution;
}
} else {
hiddenAttributions[sourceAttributionKey] = sourceAttribution;
}
}
}
return [attributions, hiddenAttributions];
};
/**
* Update the attribution element.
* @param {ol.MapEvent} mapEvent Map event.
* @this {ol.control.Attribution}
* @api
*/
ol.control.Attribution.render = function(mapEvent) {
this.updateElement_(mapEvent.frameState);
};
/**
* @private
* @param {?olx.FrameState} frameState Frame state.
*/
ol.control.Attribution.prototype.updateElement_ = function(frameState) {
if (!frameState) {
if (this.renderedVisible_) {
this.element.style.display = 'none';
this.renderedVisible_ = false;
}
return;
}
var attributions = this.getSourceAttributions(frameState);
/** @type {Object.<string, ol.Attribution>} */
var visibleAttributions = attributions[0];
/** @type {Object.<string, ol.Attribution>} */
var hiddenAttributions = attributions[1];
var attributionElement, attributionKey;
for (attributionKey in this.attributionElements_) {
if (attributionKey in visibleAttributions) {
if (!this.attributionElementRenderedVisible_[attributionKey]) {
this.attributionElements_[attributionKey].style.display = '';
this.attributionElementRenderedVisible_[attributionKey] = true;
}
delete visibleAttributions[attributionKey];
} else if (attributionKey in hiddenAttributions) {
if (this.attributionElementRenderedVisible_[attributionKey]) {
this.attributionElements_[attributionKey].style.display = 'none';
delete this.attributionElementRenderedVisible_[attributionKey];
}
delete hiddenAttributions[attributionKey];
} else {
ol.dom.removeNode(this.attributionElements_[attributionKey]);
delete this.attributionElements_[attributionKey];
delete this.attributionElementRenderedVisible_[attributionKey];
}
}
for (attributionKey in visibleAttributions) {
attributionElement = document.createElement('LI');
attributionElement.innerHTML =
visibleAttributions[attributionKey].getHTML();
this.ulElement_.appendChild(attributionElement);
this.attributionElements_[attributionKey] = attributionElement;
this.attributionElementRenderedVisible_[attributionKey] = true;
}
for (attributionKey in hiddenAttributions) {
attributionElement = document.createElement('LI');
attributionElement.innerHTML =
hiddenAttributions[attributionKey].getHTML();
attributionElement.style.display = 'none';
this.ulElement_.appendChild(attributionElement);
this.attributionElements_[attributionKey] = attributionElement;
}
var renderVisible =
!ol.obj.isEmpty(this.attributionElementRenderedVisible_) ||
!ol.obj.isEmpty(frameState.logos);
if (this.renderedVisible_ != renderVisible) {
this.element.style.display = renderVisible ? '' : 'none';
this.renderedVisible_ = renderVisible;
}
if (renderVisible &&
ol.obj.isEmpty(this.attributionElementRenderedVisible_)) {
this.element.classList.add('ol-logo-only');
} else {
this.element.classList.remove('ol-logo-only');
}
this.insertLogos_(frameState);
};
/**
* @param {?olx.FrameState} frameState Frame state.
* @private
*/
ol.control.Attribution.prototype.insertLogos_ = function(frameState) {
var logo;
var logos = frameState.logos;
var logoElements = this.logoElements_;
for (logo in logoElements) {
if (!(logo in logos)) {
ol.dom.removeNode(logoElements[logo]);
delete logoElements[logo];
}
}
var image, logoElement, logoKey;
for (logoKey in logos) {
var logoValue = logos[logoKey];
if (logoValue instanceof HTMLElement) {
this.logoLi_.appendChild(logoValue);
logoElements[logoKey] = logoValue;
}
if (!(logoKey in logoElements)) {
image = new Image();
image.src = logoKey;
if (logoValue === '') {
logoElement = image;
} else {
logoElement = document.createElement('a');
logoElement.href = logoValue;
logoElement.appendChild(image);
}
this.logoLi_.appendChild(logoElement);
logoElements[logoKey] = logoElement;
}
}
this.logoLi_.style.display = !ol.obj.isEmpty(logos) ? '' : 'none';
};
/**
* @param {Event} event The event to handle
* @private
*/
ol.control.Attribution.prototype.handleClick_ = function(event) {
event.preventDefault();
this.handleToggle_();
};
/**
* @private
*/
ol.control.Attribution.prototype.handleToggle_ = function() {
this.element.classList.toggle('ol-collapsed');
if (this.collapsed_) {
ol.dom.replaceNode(this.collapseLabel_, this.label_);
} else {
ol.dom.replaceNode(this.label_, this.collapseLabel_);
}
this.collapsed_ = !this.collapsed_;
};
/**
* Return `true` if the attribution is collapsible, `false` otherwise.
* @return {boolean} True if the widget is collapsible.
* @api stable
*/
ol.control.Attribution.prototype.getCollapsible = function() {
return this.collapsible_;
};
/**
* Set whether the attribution should be collapsible.
* @param {boolean} collapsible True if the widget is collapsible.
* @api stable
*/
ol.control.Attribution.prototype.setCollapsible = function(collapsible) {
if (this.collapsible_ === collapsible) {
return;
}
this.collapsible_ = collapsible;
this.element.classList.toggle('ol-uncollapsible');
if (!collapsible && this.collapsed_) {
this.handleToggle_();
}
};
/**
* Collapse or expand the attribution according to the passed parameter. Will
* not do anything if the attribution isn't collapsible or if the current
* collapsed state is already the one requested.
* @param {boolean} collapsed True if the widget is collapsed.
* @api stable
*/
ol.control.Attribution.prototype.setCollapsed = function(collapsed) {
if (!this.collapsible_ || this.collapsed_ === collapsed) {
return;
}
this.handleToggle_();
};
/**
* Return `true` when the attribution is currently collapsed or `false`
* otherwise.
* @return {boolean} True if the widget is collapsed.
* @api stable
*/
ol.control.Attribution.prototype.getCollapsed = function() {
return this.collapsed_;
};