From f245b615c96141e9f63013db9b98c8d3f649dd8d Mon Sep 17 00:00:00 2001
From: Frederic Brodbeck <der.froedi@gmail.com>
Date: Sat, 2 Oct 2021 16:26:54 +0200
Subject: [PATCH 1/2] fixed indentation

---
 nemo-preview/src/js/ui/application.js | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/nemo-preview/src/js/ui/application.js b/nemo-preview/src/js/ui/application.js
index 35bbce03..67050df3 100644
--- a/nemo-preview/src/js/ui/application.js
+++ b/nemo-preview/src/js/ui/application.js
@@ -94,14 +94,15 @@ var Application = new Lang.Class({
         this._mainWindow.close();
     },
 
-    ShowFile : function(uri, xid, closeIfAlreadyShown) {
-	let file = Gio.file_new_for_uri(uri);
-	if (closeIfAlreadyShown &&
-	    this._mainWindow.file &&
-	    this._mainWindow.file.equal(file)) {
-	    this._mainWindow.close();
-	    return;
-	}
+    ShowFile: function(uri, xid, closeIfAlreadyShown) {
+        let file = Gio.file_new_for_uri(uri);
+        if (closeIfAlreadyShown &&
+            this._mainWindow.file &&
+            this._mainWindow.file.equal(file)
+        ) {
+            this._mainWindow.close();
+            return;
+        }
         this._mainWindow.setParent(xid);
         this._mainWindow.setFile(file);
     }

From 4c9f1a2ba8cf111a765aa789749609bab2838f8e Mon Sep 17 00:00:00 2001
From: Frederic Brodbeck <der.froedi@gmail.com>
Date: Sat, 2 Oct 2021 17:10:32 +0200
Subject: [PATCH 2/2] send event on arrow key press

---
 nemo-preview/src/js/ui/application.js | 28 ++++++++++++++++++---------
 nemo-preview/src/js/ui/mainWindow.js  | 13 +++++++++++++
 2 files changed, 32 insertions(+), 9 deletions(-)

diff --git a/nemo-preview/src/js/ui/application.js b/nemo-preview/src/js/ui/application.js
index 67050df3..d257ef29 100644
--- a/nemo-preview/src/js/ui/application.js
+++ b/nemo-preview/src/js/ui/application.js
@@ -42,15 +42,18 @@ const NEMO_PREVIEW_DBUS_PATH = '/org/nemo/Preview';
 const NEMO_PREVIEW_DBUS_NAME = 'org.nemo.Preview';
 
 const NemoPreviewIface = '<node> \
-<interface name="org.nemo.Preview"> \
-<method name="ShowFile"> \
-    <arg type="s" direction="in" name="uri" /> \
-    <arg type="i" direction="in" name="xid" /> \
-    <arg type="b" direction="in" name="closeIfAlreadyShown" /> \
-</method> \
-<method name="Close"> \
-</method> \
-</interface> \
+    <interface name="org.nemo.Preview"> \
+        <method name="ShowFile"> \
+            <arg type="s" direction="in" name="uri" /> \
+            <arg type="i" direction="in" name="xid" /> \
+            <arg type="b" direction="in" name="closeIfAlreadyShown" /> \
+        </method> \
+        <method name="Close"> \
+        </method> \
+        <signal name="SelectionEvent"> \
+            <arg type="q" name="direction" /> \
+        </signal> \
+    </interface> \
 </node>';
 
 var Application = new Lang.Class({
@@ -105,5 +108,12 @@ var Application = new Lang.Class({
         }
         this._mainWindow.setParent(xid);
         this._mainWindow.setFile(file);
+    },
+
+    emitSelectionEvent(direction) {
+        this._dbusImpl.emit_signal(
+            'SelectionEvent',
+            new GLib.Variant('(u)', [direction])
+        );
     }
 });
diff --git a/nemo-preview/src/js/ui/mainWindow.js b/nemo-preview/src/js/ui/mainWindow.js
index f70c3060..e298ca39 100644
--- a/nemo-preview/src/js/ui/mainWindow.js
+++ b/nemo-preview/src/js/ui/mainWindow.js
@@ -200,6 +200,19 @@ MainWindow.prototype = {
             key == Gdk.KEY_F11)
             this.toggleFullScreen();
 
+        if (key == Gdk.KEY_Down) {
+            this._application.emitSelectionEvent(Gtk.DirectionType.DOWN);
+        }
+        else if (key == Gdk.KEY_Up) {
+            this._application.emitSelectionEvent(Gtk.DirectionType.UP);
+        }
+        else if (key == Gdk.KEY_Left) {
+            this._application.emitSelectionEvent(Gtk.DirectionType.LEFT);
+        }
+        else if (key == Gdk.KEY_Right) {
+            this._application.emitSelectionEvent(Gtk.DirectionType.RIGHT);
+        }
+
         return false;
     },