From 93fa1034f51594fa4e61d2f8bde8ecdae39ddbdc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Florian=20M=C3=BCllner?= <fmuellner@gnome.org>
Date: Thu, 19 Dec 2019 03:28:50 +0100
Subject: [PATCH] grabHelper: Add (promised-based) grabAsync()

Some GrabHelper uses are in the form:

    doPreGrabStuff();

    this._grabHelper.grab({
        onUngrab: () => {
            undoPreGrabStuff();
        },
    });

A promise-based variant allows to write this more cleanly as:

    doPreGrabStuff();

    await this._grabHelper.grabAsync();

    undoPreGrabStuff();

https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/903
---
 js/ui/grabHelper.js | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/js/ui/grabHelper.js b/js/ui/grabHelper.js
index ffe07b2ec..2ba2aad9a 100644
--- a/js/ui/grabHelper.js
+++ b/js/ui/grabHelper.js
@@ -194,6 +194,15 @@ var GrabHelper = class GrabHelper {
         return true;
     }
 
+    grabAsync(params) {
+        return new Promise((resolve, reject) => {
+            params.onUngrab = resolve;
+
+            if (!this.grab(params))
+                reject(new Error('Grab failed'));
+        });
+    }
+
     _takeModalGrab() {
         let firstGrab = this._modalCount == 0;
         if (firstGrab) {