1 files changed, 187 insertions, 0 deletions
diff --git a/src/Map/Layer.js b/src/Map/Layer.js
new file mode 100644
index 0000000..93e5799
--- /dev/null
+++ b/src/Map/Layer.js
@@ -0,0 +1,187 @@
+import h from '../Util/DomUtil.js';
+
+class Layer {
+	constructor(id, name) {
+		this.id = id;
+		this.name = name;
+		this.subLayers = [];
+		this.visible = true;
+	}
+}
+
+class LayerData {
+	constructor() {
+		this.layers = [];
+		this.idPool = 0;
+	}
+
+	_getNewId() {
+		const id = this.idPool;
+		this.idPool += 1;
+		return `layer${id}`;
+	}
+
+	_getContainerAndId(idChain) {
+		if (idChain.length === 0)
+			return [ this.layers, null ];
+
+		let container = this.layers;
+		while (idChain.length > 1) {
+			const id = idChain.pop();
+			console.log(container, id);
+			container = container.find(layer => layer.id === id).subLayers;
+			console.log(idChain);
+		}
+
+		return [ container, idChain[0] ];
+	}
+
+	_idToIndex(container, id) {
+		return container.findIndex(layer => layer.id === id);
+	}
+
+	insertLayer(idChain) {
+		const layerId = this._getNewId();
+		const newLayer = new Layer(layerId, `Layer ${layerId}`);
+
+		const [ container, id ] = this._getContainerAndId(idChain);
+		if (id === null) {
+			container.push(newLayer);
+			return;
+		}
+
+		const index = this._idToIndex(container, id);
+		container.splice(index+1, 0, newLayer);
+	}
+
+	removeLayer(idChain) {
+		const [ container, id ] = this._getContainerAndId(idChain);
+		if (id === null) return;
+
+		const index = this._idToIndex(container, id);
+		container.splice(index, 1);
+	}
+
+	pushLayer(idChain) {
+		const [ container, id ] = this._getContainerAndId(idChain);
+		if (id === null) return; // nothing to do
+
+		const index = this._idToIndex(container, id);
+		const after = container[index+1];
+		if (!after) return; // no successor to push to, do nothing
+		after.subLayers.push(container[index]);
+		container.splice(index, 1);
+	}
+}
+
+
+class LayerView {
+	constructor(parentId) {
+		const parentElement = document.getElementById(parentId);
+
+		const button = (label, f) => {
+			const b = h('button', label, { 'style': 'margin: 0 5px' });
+			b.onclick = f;
+			return b;
+		}
+
+		this.layersList = h('ul');
+
+		const root = h('fieldset', { 'class': 'layer-view' }, [
+			h('legend', 'Layers'),
+			this.layersList,
+			button('Move Up', () => this.onMoveUp(this._getIdChain())),
+			button('Move Down', () => this.onMoveDown(this._getIdChain())),
+			button('Toggle Visible', () => this.onShowHideLayer(this._getIdChain())),
+			button('Rename', () => this.onRenameLayer(this._getIdChain())),
+			h('br'), h('br'),
+			button('Add Layer', () => this.onAddLayer(this._getIdChain())),
+			button('Remove Layer', () => this.onRemoveLayer(this._getIdChain())),
+			button('Push', () => this.onPushLayer(this._getIdChain())), 
+			button('Pop', () => this.onPopLayer(this._getIdChain())),
+		]);
+
+		parentElement.appendChild(root);
+		
+		this.selectedId = null;
+
+		this.onAddLayer = () => {};
+		this.onRemoveLayer = () => {};
+		this.onPushLayer = () => {};
+		this.onPopLayer = () => {};
+
+		this.onMoveUp = () => {};
+		this.onMoveDown = () => {};
+		this.onShowHideLayer = () => {};
+		this.onRenameLayer = () => {};
+	}
+
+	_getIdChain() {
+		const chain = [];
+		let el = this.selected;
+
+		if (el === null || el === undefined) return [];
+		while (el !== this.layersList && el !== null) {
+			if (el.nodeName.toLowerCase() === 'li')
+				chain.push(el.id);
+			el = el.parentNode;
+		}
+		return chain;
+	}
+
+	renderLayers(layers, root=this.layersList) {
+		let selectedId = '';
+		if (this.selected) selectedId = this.selected.id;
+		if (root === this.layersList) this.layersList.replaceChildren();
+		for (let layer of layers) {
+			let classList = '';
+			if (layer.visible) classList += 'visible ';
+			const el = h(
+				'li', 
+				layer.name, 
+				{
+					id: layer.id, 
+					'class': classList,
+				}
+			);
+
+			if (selectedId === layer.id) {
+				el.classList.add('selected');
+				this.selected = el;
+			}
+			el.onclick = e => {
+				e.stopPropagation();
+				if (this.selected) this.selected.classList.remove('selected');
+				this.selected = el;
+				el.classList.add('selected');
+			};
+			if (layer.subLayers.length !== 0) {
+				const ul = h('ul');
+				this.renderLayers(layer.subLayers, ul);
+				el.appendChild(ul);
+			}
+			root.prepend(el);
+		}
+	}
+}
+
+
+class LayerController {
+	constructor(data, view) {
+		this.data = data;
+		this.view = view;
+
+		const respond = f => ( idChain => { f(idChain); this.updateView(); } );
+
+		this.view.onAddLayer = idChain => { this.data.insertLayer(idChain); this.updateView(); };
+		this.view.onPushLayer = idChain => { this.data.pushLayer(idChain); this.updateView(); };
+		this.view.onRemoveLayer = idChain => { this.data.removeLayer(idChain); this.updateView(); }
+	}
+
+	updateView() {
+		this.view.renderLayers(this.data.layers);
+	}
+}
+
+
+export { LayerData, LayerView, LayerController };