[gnome-shell/gbsneto/icon-grid-dnd-fixes: 7/19] iconGrid: Add moveItem

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

commit 71b06c902791d1e2d999302ffd6e0ca993289726
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Wed Sep 23 16:52:09 2020 -0300

    iconGrid: Add moveItem
    
    This new public API moves items without removing and readding
    them, which allows us to avoid some tricky behavior. Noticeably,
    following the original design described at 3555550d5, the new
    IconGridLayout.moveItem() method does not call `layout_changed`.
    This is done by IconGrid itself, queueing a relayout.
    
    https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1447

 js/ui/iconGrid.js | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
---
diff --git a/js/ui/iconGrid.js b/js/ui/iconGrid.js
index 12a4aed9bd..a6a42b615a 100644
--- a/js/ui/iconGrid.js
+++ b/js/ui/iconGrid.js
@@ -847,6 +847,22 @@ var IconGridLayout = GObject.registerClass({
         this.addItem(item);
     }
 
+    /**
+     * moveItem:
+     * @param {Clutter.Actor} item: item to move
+     * @param {int} newPage: new page of the item
+     * @param {int} newPosition: new page of the item
+     *
+     * Moves @item to the grid. @item must be part of the grid.
+     */
+    moveItem(item, newPage, newPosition) {
+        if (!this._items.has(item))
+            throw new Error(`Item ${item} is not part of the IconGridLayout`);
+
+        this._removeItemData(item);
+        this._addItemToPage(item, newPage, newPosition);
+    }
+
     /**
      * removeItem:
      * @param {Clutter.Actor} item: item to remove from the grid
@@ -1422,6 +1438,19 @@ var IconGrid = GObject.registerClass({
         this.layout_manager.appendItem(item);
     }
 
+    /**
+     * moveItem:
+     * @param {Clutter.Actor} item: item to move
+     * @param {int} newPage: new page of the item
+     * @param {int} newPosition: new page of the item
+     *
+     * Moves @item to the grid. @item must be part of the grid.
+     */
+    moveItem(item, newPage, newPosition) {
+        this.layout_manager.moveItem(item, newPage, newPosition);
+        this.queue_relayout();
+    }
+
     /**
      * removeItem:
      * @param {Clutter.Actor} item: item to remove from the grid