150 lines
3.9 KiB
JavaScript
150 lines
3.9 KiB
JavaScript
/**
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* @module ol/renderer/Composite
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*/
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import {CLASS_UNSELECTABLE} from '../css.js';
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import {visibleAtResolution} from '../layer/Layer.js';
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import RenderEvent from '../render/Event.js';
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import RenderEventType from '../render/EventType.js';
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import MapRenderer from './Map.js';
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import SourceState from '../source/State.js';
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import {replaceChildren} from '../dom.js';
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import {labelCache} from '../render/canvas.js';
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/**
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* @classdesc
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* Canvas map renderer.
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* @api
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*/
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class CompositeMapRenderer extends MapRenderer {
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/**
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* @param {import("../PluggableMap.js").default} map Map.
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*/
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constructor(map) {
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super(map);
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map.attachLabelCache(labelCache);
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/**
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* @private
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* @type {HTMLDivElement}
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*/
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this.element_ = document.createElement('div');
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const style = this.element_.style;
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style.position = 'absolute';
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style.width = '100%';
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style.height = '100%';
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style.zIndex = '0';
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this.element_.className = CLASS_UNSELECTABLE + ' ol-layers';
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const container = map.getViewport();
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container.insertBefore(this.element_, container.firstChild || null);
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/**
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* @private
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* @type {Array<HTMLElement>}
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*/
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this.children_ = [];
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/**
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* @private
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* @type {boolean}
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*/
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this.renderedVisible_ = true;
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}
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/**
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* @param {import("../render/EventType.js").default} type Event type.
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* @param {import("../PluggableMap.js").FrameState} frameState Frame state.
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*/
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dispatchRenderEvent(type, frameState) {
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const map = this.getMap();
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if (map.hasListener(type)) {
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const event = new RenderEvent(type, undefined, frameState);
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map.dispatchEvent(event);
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}
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}
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/**
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* @inheritDoc
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*/
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renderFrame(frameState) {
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if (!frameState) {
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if (this.renderedVisible_) {
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this.element_.style.display = 'none';
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this.renderedVisible_ = false;
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}
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return;
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}
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this.calculateMatrices2D(frameState);
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this.dispatchRenderEvent(RenderEventType.PRECOMPOSE, frameState);
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const layerStatesArray = frameState.layerStatesArray.sort(function(a, b) {
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return a.zIndex - b.zIndex;
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});
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const viewResolution = frameState.viewState.resolution;
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this.children_.length = 0;
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let previousElement = null;
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for (let i = 0, ii = layerStatesArray.length; i < ii; ++i) {
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const layerState = layerStatesArray[i];
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if (!visibleAtResolution(layerState, viewResolution) ||
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(layerState.sourceState != SourceState.READY && layerState.sourceState != SourceState.UNDEFINED)) {
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continue;
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}
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const layer = layerState.layer;
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const element = layer.render(frameState, previousElement);
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if (element !== previousElement) {
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this.children_.push(element);
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previousElement = element;
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}
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}
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super.renderFrame(frameState);
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replaceChildren(this.element_, this.children_);
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this.dispatchRenderEvent(RenderEventType.POSTCOMPOSE, frameState);
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if (!this.renderedVisible_) {
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this.element_.style.display = '';
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this.renderedVisible_ = true;
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}
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this.scheduleExpireIconCache(frameState);
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}
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/**
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* @inheritDoc
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*/
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forEachLayerAtPixel(pixel, frameState, hitTolerance, callback, layerFilter) {
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const viewState = frameState.viewState;
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const viewResolution = viewState.resolution;
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const layerStates = frameState.layerStatesArray;
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const numLayers = layerStates.length;
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for (let i = numLayers - 1; i >= 0; --i) {
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const layerState = layerStates[i];
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const layer = layerState.layer;
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if (layer.hasRenderer() && visibleAtResolution(layerState, viewResolution) && layerFilter(layer)) {
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const layerRenderer = layer.getRenderer();
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const data = layerRenderer.getDataAtPixel(pixel, frameState, hitTolerance);
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if (data) {
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const result = callback(layer, data);
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if (result) {
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return result;
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}
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}
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}
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}
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return undefined;
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}
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}
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export default CompositeMapRenderer;
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