69 lines
2.1 KiB
JavaScript
Executable file
69 lines
2.1 KiB
JavaScript
Executable file
/**
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* When hardwareBackButton: false in config,
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* we need to make sure we also block the default
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* webview behavior. If we don't then it will be
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* possible for users to navigate backward while
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* an overlay is still open. Additionally, it will
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* give the appearance that the hardwareBackButton
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* config is not working as the page transition
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* will still happen.
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*/
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const blockHardwareBackButton = () => {
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document.addEventListener('backbutton', () => { }); // tslint:disable-line
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};
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const startHardwareBackButton = () => {
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const doc = document;
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let busy = false;
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doc.addEventListener('backbutton', () => {
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if (busy) {
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return;
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}
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let index = 0;
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let handlers = [];
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const ev = new CustomEvent('ionBackButton', {
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bubbles: false,
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detail: {
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register(priority, handler) {
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handlers.push({ priority, handler, id: index++ });
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}
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}
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});
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doc.dispatchEvent(ev);
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const executeAction = async (handlerRegister) => {
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try {
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if (handlerRegister && handlerRegister.handler) {
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const result = handlerRegister.handler(processHandlers);
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if (result != null) {
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await result;
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}
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}
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}
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catch (e) {
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console.error(e);
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}
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};
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const processHandlers = () => {
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if (handlers.length > 0) {
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let selectedHandler = {
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priority: Number.MIN_SAFE_INTEGER,
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handler: () => undefined,
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id: -1
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};
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handlers.forEach(handler => {
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if (handler.priority >= selectedHandler.priority) {
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selectedHandler = handler;
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}
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});
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busy = true;
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handlers = handlers.filter(handler => handler.id !== selectedHandler.id);
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executeAction(selectedHandler).then(() => busy = false);
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}
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};
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processHandlers();
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});
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};
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const OVERLAY_BACK_BUTTON_PRIORITY = 100;
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const MENU_BACK_BUTTON_PRIORITY = 99; // 1 less than overlay priority since menu is displayed behind overlays
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export { MENU_BACK_BUTTON_PRIORITY, OVERLAY_BACK_BUTTON_PRIORITY, blockHardwareBackButton, startHardwareBackButton };
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