From 8318842c7e5a9ec72cdd7bcb10786749bf773793 Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Wed, 13 May 2020 13:20:54 +0200
Subject: [PATCH] PaintBrush: Make the move tool handle arrow key events

You can now nudge layers around with the arrow keys. :^)
---
 Applications/PaintBrush/MoveTool.cpp | 32 ++++++++++++++++++++++++++++
 Applications/PaintBrush/MoveTool.h   |  1 +
 2 files changed, 33 insertions(+)

diff --git a/Applications/PaintBrush/MoveTool.cpp b/Applications/PaintBrush/MoveTool.cpp
index 372061a3667..99810243515 100644
--- a/Applications/PaintBrush/MoveTool.cpp
+++ b/Applications/PaintBrush/MoveTool.cpp
@@ -69,4 +69,36 @@ void MoveTool::on_mouseup(Layer&, GUI::MouseEvent& event, GUI::MouseEvent&)
     m_editor->window()->set_override_cursor(GUI::StandardCursor::None);
 }
 
+void MoveTool::on_keydown(GUI::KeyEvent& event)
+{
+    if (event.modifiers() != 0)
+        return;
+
+    auto* layer = m_editor->active_layer();
+    if (!layer)
+        return;
+
+    auto new_location = layer->location();
+
+    switch (event.key()) {
+    case Key_Up:
+        new_location.move_by(0, -1);
+        break;
+    case Key_Down:
+        new_location.move_by(0, 1);
+        break;
+    case Key_Left:
+        new_location.move_by(-1, 0);
+        break;
+    case Key_Right:
+        new_location.move_by(1, 0);
+        break;
+    default:
+        return;
+    }
+
+    layer->set_location(new_location);
+    m_editor->layers_did_change();
+}
+
 }
diff --git a/Applications/PaintBrush/MoveTool.h b/Applications/PaintBrush/MoveTool.h
index b4718dcb2bd..68cc76e90c6 100644
--- a/Applications/PaintBrush/MoveTool.h
+++ b/Applications/PaintBrush/MoveTool.h
@@ -38,6 +38,7 @@ public:
     virtual void on_mousedown(Layer&, GUI::MouseEvent& layer_event, GUI::MouseEvent& original_event) override;
     virtual void on_mousemove(Layer&, GUI::MouseEvent& layer_event, GUI::MouseEvent& original_event) override;
     virtual void on_mouseup(Layer&, GUI::MouseEvent& layer_event, GUI::MouseEvent& original_event) override;
+    virtual void on_keydown(GUI::KeyEvent&) override;
 
 private:
     virtual const char* class_name() const override { return "MoveTool"; }