leaflet-tilelayer-mbtiles-ts
Version:
Load MBTiles packages into Leaflet maps (Typescript fork)
225 lines (224 loc) • 10.1 kB
JavaScript
"use strict";
var __extends = (this && this.__extends) || (function () {
var extendStatics = function (d, b) {
extendStatics = Object.setPrototypeOf ||
({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
function (d, b) { for (var p in b) if (Object.prototype.hasOwnProperty.call(b, p)) d[p] = b[p]; };
return extendStatics(d, b);
};
return function (d, b) {
if (typeof b !== "function" && b !== null)
throw new TypeError("Class extends value " + String(b) + " is not a constructor or null");
extendStatics(d, b);
function __() { this.constructor = d; }
d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
})();
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
var __generator = (this && this.__generator) || function (thisArg, body) {
var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
function verb(n) { return function (v) { return step([n, v]); }; }
function step(op) {
if (f) throw new TypeError("Generator is already executing.");
while (g && (g = 0, op[0] && (_ = 0)), _) try {
if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
if (y = 0, t) op = [op[0] & 2, t.value];
switch (op[0]) {
case 0: case 1: t = op; break;
case 4: _.label++; return { value: op[1], done: false };
case 5: _.label++; y = op[1]; op = [0]; continue;
case 7: op = _.ops.pop(); _.trys.pop(); continue;
default:
if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
if (t[2]) _.ops.pop();
_.trys.pop(); continue;
}
op = body.call(thisArg, _);
} catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
}
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.MBTilesEvents = void 0;
var L = require("leaflet");
var MBTilesReader_1 = require("./MBTilesReader");
var utils_1 = require("./utils");
var MBTilesEvents;
(function (MBTilesEvents) {
MBTilesEvents["LOADED"] = "databaseloaded";
MBTilesEvents["ERROR"] = "databaseerror";
})(MBTilesEvents = exports.MBTilesEvents || (exports.MBTilesEvents = {}));
/**
* Builds the MBTiles tileLayer
* @class
* @extends {L.TileLayer}
*/
var MBTiles = /** @class */ (function (_super) {
__extends(MBTiles, _super);
function MBTiles(urlOrData, options) {
var _this = _super.call(this, typeof urlOrData === 'string' ? urlOrData : '', options) || this;
_this._mbTilesReader = null;
_this._imageFormat = 'image/png';
_this._globalEvents = null;
_this._loadMBTiles(urlOrData);
_this._toggleEvents(true);
return _this;
}
MBTiles.prototype.createTile = function (coords, done) {
var tile = document.createElement('img');
if (this.options.crossOrigin) {
tile.crossOrigin = '';
}
/*
* Alt tag is set to empty string to keep screen readers from reading URL and for compliance reasons
* http://www.w3.org/TR/WCAG20-TECHS/H67
*/
tile.alt = '';
/*
* Set role="presentation" to force screen readers to ignore this
* https://www.w3.org/TR/wai-aria/roles#textalternativecomputation
*/
tile.setAttribute('role', 'presentation');
// In TileLayer.MBTiles, the getTileUrl() method can only be called when
// the database has already been loaded.
if (this._mbTilesReader && this._mbTilesReader.isLoaded) {
L.DomEvent.on(tile, 'load', L.Util.bind(this._tileOnLoad, this, done, tile));
L.DomEvent.on(tile, 'error', L.Util.bind(this._tileOnError, this, done, tile));
tile.src = this.getTileUrl(coords);
}
else {
this.on(MBTilesEvents.LOADED, function () {
L.DomEvent.on(tile, 'load', L.Util.bind(this._tileOnLoad, this, done, tile));
L.DomEvent.on(tile, 'error', L.Util.bind(this._tileOnError, this, done, tile));
tile.src = this.getTileUrl(coords);
}.bind(this));
}
return tile;
};
MBTiles.prototype.getTileUrl = function (coords) {
if (this._mbTilesReader) {
var data = this._mbTilesReader.getTile(coords.x, this._globalTileRange.max.y - coords.y, coords.z);
if (data) {
return window.URL.createObjectURL(new Blob([data], { type: this._imageFormat }));
}
}
return L.Util.emptyImageUrl;
};
MBTiles.prototype._loadMBTiles = function (urlOrData) {
return __awaiter(this, void 0, void 0, function () {
var response, _a, buffer, err_1;
return __generator(this, function (_b) {
switch (_b.label) {
case 0:
if (!(typeof urlOrData === 'string')) return [3 /*break*/, 9];
_b.label = 1;
case 1:
_b.trys.push([1, 7, , 8]);
if (!L.Browser.android) return [3 /*break*/, 3];
return [4 /*yield*/, utils_1.default.fetchLocal(urlOrData)];
case 2:
_a = _b.sent();
return [3 /*break*/, 5];
case 3: return [4 /*yield*/, fetch(urlOrData)];
case 4:
_a = _b.sent();
_b.label = 5;
case 5:
response = _a;
return [4 /*yield*/, response.arrayBuffer()];
case 6:
buffer = _b.sent();
this._openMBTile(buffer);
return [3 /*break*/, 8];
case 7:
err_1 = _b.sent();
this.fire(MBTilesEvents.ERROR, { error: err_1 });
return [3 /*break*/, 8];
case 8: return [3 /*break*/, 10];
case 9:
if (urlOrData instanceof ArrayBuffer) {
this._openMBTile(urlOrData);
}
else {
this.fire(MBTilesEvents.ERROR);
}
_b.label = 10;
case 10: return [2 /*return*/];
}
});
});
};
MBTiles.prototype._openMBTile = function (buffer) {
try {
this._mbTilesReader = new MBTilesReader_1.default(buffer);
var attribution = this._mbTilesReader.attribution;
if (attribution) {
this.options.attribution = attribution;
}
var minZoom = this._mbTilesReader.minZoom;
if (minZoom) {
this.options.minZoom = minZoom;
}
var maxZoom = this._mbTilesReader.maxZoom;
if (maxZoom) {
this.options.maxZoom = maxZoom;
}
var format = this._mbTilesReader.format;
if (format) {
this._imageFormat = "image/".concat(format);
}
this.fire(MBTilesEvents.LOADED);
}
catch (err) {
this.fire(MBTilesEvents.ERROR, { error: err });
}
};
MBTiles.prototype._toggleEvents = function (bind) {
var _this = this;
if (bind === void 0) { bind = true; }
if (this._globalEvents === null) {
this._globalEvents = {
tileunload: function (event) {
_this._revokeTile(event);
},
remove: function () {
_this._shutdown();
},
};
}
for (var e in this._globalEvents) {
if (Object.prototype.hasOwnProperty.call(this._globalEvents, e)) {
this[bind ? 'on' : 'off'](e, this._globalEvents[e]);
}
}
};
MBTiles.prototype._revokeTile = function (event) {
if (event.tile && event.tile.src != L.Util.emptyImageUrl) {
URL.revokeObjectURL(event.tile.src);
}
};
MBTiles.prototype._shutdown = function () {
if (this._mbTilesReader && this._mbTilesReader.isLoaded) {
this._mbTilesReader.close();
this._toggleEvents(false);
this._mbTilesReader = null;
}
else {
this.on(MBTilesEvents.LOADED, this._shutdown);
}
};
return MBTiles;
}(L.TileLayer));
exports.default = MBTiles;