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Copy pathL.Control.Layers.Tree.js
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Copy pathL.Control.Layers.Tree.js
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396 lines (356 loc) · 15.4 KB
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/*
* Control like L.Control.Layers, but showing layers in a tree.
* Do not forget to include the css file.
*/
(function(L) {
if (typeof L === 'undefined') {
throw new Error('Leaflet must be included first');
}
/*
* L.Control.Layers.Tree extends L.Control.Layers because it reuses
* most of its functionality. Only the HTML creation is different.
*/
L.Control.Layers.Tree = L.Control.Layers.extend({
options: {
closedSymbol: '+',
openedSymbol: '−',
spaceSymbol: ' ',
selectorBack: false,
namedToggle: false,
collapseAll: '',
expandAll: '',
},
// Class names are error prone texts, so write them once here
_initClassesNames: function() {
this.cls = {
children: 'leaflet-layerstree-children',
childrenNopad: 'leaflet-layerstree-children-nopad',
hide: 'leaflet-layerstree-hide',
closed: 'leaflet-layerstree-closed',
opened: 'leaflet-layerstree-opened',
space: 'leaflet-layerstree-header-space',
pointer: 'leaflet-layerstree-header-pointer',
header: 'leaflet-layerstree-header',
neverShow: 'leaflet-layerstree-nevershow',
node: 'leaflet-layerstree-node',
name: 'leaflet-layerstree-header-name',
label: 'leaflet-layerstree-header-label',
};
},
initialize: function(baseTree, overlaysTree, options) {
this._scrollTop = 0;
this._initClassesNames();
this._baseTree = null;
this._overlaysTree = null;
L.Util.setOptions(this, options);
L.Control.Layers.prototype.initialize.call(this, null, null, options);
this._setTrees(baseTree, overlaysTree);
},
setBaseTree: function(tree) {
return this._setTrees(tree);
},
setOverlayTree: function(tree) {
return this._setTrees(undefined, tree);
},
addBaseLayer: function(layer, name) {
throw 'addBaseLayer is disabled';
},
addOverlay: function(layer, name) {
throw 'addOverlay is disabled';
},
removeLayer: function(layer) {
throw 'removeLayer is disabled';
},
collapse: function() {
this._scrollTop = this._sect().scrollTop;
return L.Control.Layers.prototype.collapse.call(this);
},
expand: function() {
var ret = L.Control.Layers.prototype.expand.call(this);
this._sect().scrollTop = this._scrollTop;
},
onAdd: function(map) {
function changeName(layer) {
if (layer._layersTreeName) {
toggle.innerHTML = layer._layersTreeName;
}
}
var ret = L.Control.Layers.prototype.onAdd.call(this, map);
if (this.options.namedToggle) {
var toggle = this._container.getElementsByClassName('leaflet-control-layers-toggle')[0];
L.DomUtil.addClass(toggle, 'leaflet-layerstree-named-toggle');
// Start with this value...
map.eachLayer(function(layer) {changeName(layer);});
// ... and change it whenever the baselayer is changed.
map.on('baselayerchange', function(e) {changeName(e.layer);}, this);
}
return ret;
},
// Expands the whole tree (base other overlays)
expandTree: function(overlay) {
var container = overlay ? this._overlaysList : this._baseLayersList;
if (container) {
this._applyOnTree(container, false);
}
return this._localExpand();
},
// Collapses the whole tree (base other overlays)
collapseTree: function(overlay) {
var container = overlay ? this._overlaysList : this._baseLayersList;
if (container) {
this._applyOnTree(container, true);
}
return this._localExpand();
},
// Expands the tree, only to show the selected inputs
expandSelected: function(overlay) {
function iter(el) {
// Function to iterate the whole DOM upwards
var p = el.parentElement;
if (p) {
if (L.DomUtil.hasClass(p, that.cls.children) &&
!L.DomUtil.hasClass(el, that.cls.childrenNopad)) {
L.DomUtil.removeClass(p, hide);
}
if (L.DomUtil.hasClass(p, that.cls.node)) {
var h = p.getElementsByClassName(that.cls.header)[0];
that._applyOnTree(h, false);
}
iter(p);
}
}
var that = this;
var container = overlay ? this._overlaysList : this._baseLayersList;
if (!container) return this;
var hide = this.cls.hide;
var inputs = this._layerControlInputs || container.getElementsByTagName('input');
for (var i = 0; i < inputs.length; i++) {
// Loop over every (valid) input.
var input = inputs[i];
if (this._getLayer && !!this._getLayer(input.layerId).overlay != !!overlay) continue
if (input.checked) {
// Get out of the header,
// to not open the posible (but rare) children
iter(input.parentElement.parentElement.parentElement.parentElement);
}
}
return this._localExpand();
},
// "private" methods, not exposed in the API
_sect: function() {
// to keep compatibility after 1.3 https://github.com/Leaflet/Leaflet/pull/6380
return this._section || this._form;
},
_setTrees: function(base, overlays) {
var id = 0; // to keep unique id
function iterate(tree, output, overlays) {
if (tree && tree.layer) {
if (!overlays) {
tree.layer._layersTreeName = tree.name || tree.label;
}
output[id++] = tree.layer;
}
if (tree && tree.children && tree.children.length) {
tree.children.forEach(function(child) {
iterate(child, output, overlays);
});
}
return output;
}
// We accept arrays, but convert into an object with children
function forArrays(input) {
if (Array.isArray(input)) {
return {noShow: true, children: input};
} else {
return input
}
}
// Clean everything, and start again.
if (this._layerControlInputs) {
this._layerControlInputs = [];
}
for (var i = 0; i < this._layers.length; ++i) {
this._layers[i].layer.off('add remove', this._onLayerChange, this);
}
this._layers = [];
if (base !== undefined) this._baseTree = forArrays(base);
if (overlays !== undefined) this._overlaysTree = forArrays(overlays);
var bflat = iterate(this._baseTree, {});
for (var i in bflat) {
this._addLayer(bflat[i], i);
}
var oflat = iterate(this._overlaysTree, {}, true);
for (i in oflat) {
this._addLayer(oflat[i], i, true);
}
return (this._map) ? this._update() : this;
},
// Used to update the vertical scrollbar
_localExpand: function() {
if (this._map && L.DomUtil.hasClass(this._container, 'leaflet-control-layers-expanded')) {
var top = this._sect().scrollTop;
this.expand();
this._sect().scrollTop = top; // to keep the scroll location
this._scrollTop = top;
}
return this;
},
// collapses or expands the tree in the containter.
_applyOnTree: function(container, collapse) {
var iters = [
{cls: this.cls.children, hide: collapse},
{cls: this.cls.opened, hide: collapse},
{cls: this.cls.closed, hide: !collapse},
];
iters.forEach(function(it) {
var els = container.getElementsByClassName(it.cls);
for (var i = 0; i < els.length; i++) {
var el = els[i];
if (L.DomUtil.hasClass(el, this.cls.childrenNopad)) {
// do nothing
} else if (it.hide) {
L.DomUtil.addClass(el, this.cls.hide);
} else {
L.DomUtil.removeClass(el, this.cls.hide);
}
}
}, this);
},
// it is called in the original _update, and shouldn't do anything.
_addItem: function(obj) {
},
// overwrite _update function in Control.Layers
_update: function() {
if (!this._container) { return this; }
L.Control.Layers.prototype._update.call(this);
this._addTreeLayout(this._baseTree, false);
this._addTreeLayout(this._overlaysTree, true);
return this._localExpand();
},
// Create the DOM objects for the tree
_addTreeLayout: function(tree, overlay) {
if (!tree) return;
var container = overlay ? this._overlaysList : this._baseLayersList;
this._expandCollapseAll(overlay, this.options.collapseAll, this.collapseTree);
this._expandCollapseAll(overlay, this.options.expandAll, this.expandTree);
this._iterateTreeLayout(tree, container, overlay, tree.noShow)
if (this._checkDisabledLayers) {
// to keep compatibility
this._checkDisabledLayers();
}
},
// Create the "Collapse all" or expand, if needed.
_expandCollapseAll: function(overlay, text, fn, ctx) {
var container = overlay ? this._overlaysList : this._baseLayersList;
ctx = ctx ? ctx : this;
if (text) {
var o = document.createElement('div');
o.className = 'leaflet-layerstree-expand-collapse';
container.appendChild(o);
o.innerHTML = text;
o.tabIndex = 0;
L.DomEvent.on(o, 'click keydown', function(e) {
if (e.type !== 'keydown' || e.keyCode === 32) {
o.blur()
fn.call(ctx, overlay);
this._localExpand();
}
}, this);
}
},
// recursive funtion to create the DOM children
_iterateTreeLayout: function(tree, container, overlay, noShow) {
if (!tree) return;
function creator(type, cls, append, innerHTML) {
var obj = L.DomUtil.create(type, cls, append);
if (innerHTML) obj.innerHTML = innerHTML;
return obj;
}
// create the header with it fields
var header = creator('div', this.cls.header, container);
var sel = creator('span');
var entry = creator('span');
var closed = creator('span', this.cls.closed, sel, this.options.closedSymbol);
var opened = creator('span', this.cls.opened, sel, this.options.openedSymbol);
var space = creator('span', this.cls.space, null, this.options.spaceSymbol);
if (this.options.selectorBack) {
sel.insertBefore(space, closed);
header.appendChild(entry);
header.appendChild(sel);
} else {
sel.appendChild(space);
header.appendChild(sel);
header.appendChild(entry);
}
var hide = this.cls.hide; // To toggle state
// create the children group, with the header event click
if (tree.children) {
var children = creator('div', this.cls.children, container);
var sensible = tree.layer ? sel : header;
L.DomUtil.addClass(sensible, this.cls.pointer);
sensible.tabIndex = 0;
L.DomEvent.on(sensible, 'click keydown', function(e) {
if (e.type === 'keydown' && e.keyCode !== 32) {
return
}
sensible.blur();
if (L.DomUtil.hasClass(opened, hide)) {
// it is not opened, so open it
L.DomUtil.addClass(closed, hide);
L.DomUtil.removeClass(opened, hide);
L.DomUtil.removeClass(children, hide);
} else {
// close it
L.DomUtil.removeClass(closed, hide);
L.DomUtil.addClass(opened, hide);
L.DomUtil.addClass(children, hide);
}
this._localExpand();
}, this);
tree.children.forEach(function(child) {
var node = creator('div', this.cls.node, children)
this._iterateTreeLayout(child, node, overlay);
}, this);
} else {
// no children, so the selector makes no sense.
L.DomUtil.addClass(sel, this.cls.neverShow);
}
// create the input and label, as in Control.Layers
var label = creator(tree.layer ? 'label' : 'span', this.cls.label, entry);
if (tree.layer) {
// now create the element like in _addItem
var checked = this._map.hasLayer(tree.layer)
var input;
var radioGroup = overlay ? tree.radioGroup : 'leaflet-base-layers_' + L.Util.stamp(this);
if (radioGroup) {
input = this._createRadioElement(radioGroup, checked);
} else {
input = this._createCheckboxElement(checked);
}
if (this._layerControlInputs) {
// to keep compatibility with 1.0.3
this._layerControlInputs.push(input);
}
input.layerId = L.Util.stamp(tree.layer);
L.DomEvent.on(input, 'click', this._onInputClick, this);
label.appendChild(input);
}
var name = creator('span', this.cls.name, label, tree.label);
L.DomUtil.addClass(closed, hide);
if (noShow) {
L.DomUtil.addClass(header, this.cls.neverShow);
L.DomUtil.addClass(children, this.cls.childrenNopad);
}
},
_createCheckboxElement: function(checked) {
var input = document.createElement('input');
input.type = 'checkbox';
input.className = 'leaflet-control-layers-selector';
input.defaultChecked = checked;
return input;
},
});
L.control.layers.tree = function(base, overlays, options) {
return new L.Control.Layers.Tree(base, overlays, options);
}
})(L);
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