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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 | 3317x 1x 3316x 3316x 3316x 242x 2x 240x 240x 240x 239x 239x 240x 3316x 3316x 3316x 3316x | import { defined, DeveloperError, Event } from "@cesium/engine";
import knockout from "./ThirdParty/knockout.js";
/**
* Create a Command from a given function, for use with ViewModels.
*
* A Command is a function with an extra <code>canExecute</code> observable property to determine
* whether the command can be executed. When executed, a Command function will check the
* value of <code>canExecute</code> and throw if false. It also provides events for when
* a command has been or is about to be executed.
*
* @function
*
* @param {Function} func The function to execute.
* @param {boolean} [canExecute=true] A boolean indicating whether the function can currently be executed.
*/
function createCommand(func, canExecute) {
//>>includeStart('debug', pragmas.debug);
if (!defined(func)) {
throw new DeveloperError("func is required.");
}
//>>includeEnd('debug');
canExecute = canExecute ?? true;
const beforeExecute = new Event();
const afterExecute = new Event();
function command() {
//>>includeStart('debug', pragmas.debug);
if (!command.canExecute) {
throw new DeveloperError("Cannot execute command, canExecute is false.");
}
//>>includeEnd('debug');
const commandInfo = {
args: arguments,
cancel: false,
};
let result;
beforeExecute.raiseEvent(commandInfo);
if (!commandInfo.cancel) {
result = func.apply(null, arguments);
afterExecute.raiseEvent(result);
}
return result;
}
command.canExecute = canExecute;
knockout.track(command, ["canExecute"]);
Object.defineProperties(command, {
beforeExecute: {
value: beforeExecute,
},
afterExecute: {
value: afterExecute,
},
});
return command;
}
export default createCommand;
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