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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
var EXPORTED_SYMBOLS = ["GeckoViewPrompter"];
const { GeckoViewUtils } = ChromeUtils.import(
"resource://gre/modules/GeckoViewUtils.jsm"
);
const { Services } = ChromeUtils.import("resource://gre/modules/Services.jsm");
const { debug, warn } = GeckoViewUtils.initLogging("GeckoViewPrompter");
class GeckoViewPrompter {
constructor(aParent) {
if (aParent) {
if (aParent instanceof Window) {
this._domWin = aParent;
} else if (aParent.window) {
this._domWin = aParent.window;
} else {
this._domWin =
aParent.embedderElement && aParent.embedderElement.ownerGlobal;
}
}
if (this._domWin) {
this._dispatcher = GeckoViewUtils.getDispatcherForWindow(this._domWin);
}
if (!this._dispatcher) {
[
this._dispatcher,
this._domWin,
] = GeckoViewUtils.getActiveDispatcherAndWindow();
}
}
get domWin() {
return this._domWin;
}
_changeModalState(aEntering) {
if (!this._domWin) {
// Allow not having a DOM window.
return true;
}
// Accessing the document object can throw if this window no longer exists. See bug 789888.
try {
const winUtils = this._domWin.windowUtils;
if (!aEntering) {
winUtils.leaveModalState();
}
const event = this._domWin.document.createEvent("Events");
event.initEvent(
aEntering ? "DOMWillOpenModalDialog" : "DOMModalDialogClosed",
true,
true
);
winUtils.dispatchEventToChromeOnly(this._domWin, event);
if (aEntering) {
winUtils.enterModalState();
}
return true;
} catch (ex) {
Cu.reportError("Failed to change modal state: " + ex);
}
return false;
}
/**
* Shows a native prompt, and then spins the event loop for this thread while we wait
* for a response
*/
showPrompt(aMsg) {
let result = undefined;
if (!this._domWin || !this._changeModalState(/* aEntering */ true)) {
return result;
}
try {
this.asyncShowPrompt(aMsg, res => (result = res));
// Spin this thread while we wait for a result
Services.tm.spinEventLoopUntil(
() => this._domWin.closed || result !== undefined
);
} finally {
this._changeModalState(/* aEntering */ false);
}
return result;
}
asyncShowPrompt(aMsg, aCallback) {
let handled = false;
const onResponse = response => {
if (handled) {
return;
}
aCallback(response);
// This callback object is tied to the Java garbage collector because
// it is invoked from Java. Manually release the target callback
// here; otherwise we may hold onto resources for too long, because
// we would be relying on both the Java and the JS garbage collectors
// to run.
aMsg = undefined;
aCallback = undefined;
handled = true;
};
if (!this._dispatcher) {
onResponse(null);
return;
}
this._dispatcher.dispatch("GeckoView:Prompt", aMsg, {
onSuccess: onResponse,
onError: error => {
Cu.reportError("Prompt error: " + error);
onResponse(null);
},
});
}
}
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