[gnome-shell/gbsneto/icon-grid-dnd: 18/43] appDisplay: Add event blocker inhibition API

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 23191ec2390c504e204b4e03b97b0744c2f3dc0f
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Fri Jun 28 19:44:20 2019 -0300

    appDisplay: Add event blocker inhibition API
    
    The event blocker is an actor that is added in between the
    icon grid and the app folder popup in order to guarantee
    that clicking outside the app folder will collapse it.
    
    However, the next patch will require allowing dragging events
    to be passed to folder icons, and the event blocker gets in
    our way here, preventing drag n' drop to work properly.
    
    Add an API to inhibit the event blocker. This API will be
    used by the app folders while an item is dragged.
    
    https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/603

 js/ui/appDisplay.js | 12 ++++++++++++
 1 file changed, 12 insertions(+)
---
diff --git a/js/ui/appDisplay.js b/js/ui/appDisplay.js
index 3cb71f1d2..94a7c7474 100644
--- a/js/ui/appDisplay.js
+++ b/js/ui/appDisplay.js
@@ -338,6 +338,8 @@ var AllView = class AllView extends BaseAppView {
         this._folderSettings.connect('changed::folder-children', () => {
             Main.queueDeferredWork(this._redisplayWorkId);
         });
+
+        this._nEventBlockerInhibits = 0;
     }
 
     _itemNameChanged(item) {
@@ -672,6 +674,16 @@ var AllView = class AllView extends BaseAppView {
         for (let i = 0; i < this.folderIcons.length; i++)
             this.folderIcons[i].adaptToSize(availWidth, availHeight);
     }
+
+    inhibitEventBlocker() {
+        this._nEventBlockerInhibits++;
+        this._eventBlocker.visible = this._nEventBlockerInhibits == 0;
+    }
+
+    uninhibitEventBlocker() {
+        this._nEventBlockerInhibits--;
+        this._eventBlocker.visible = this._nEventBlockerInhibits == 0;
+    }
 };
 Signals.addSignalMethods(AllView.prototype);