Userland: Implement a magnifier app

This utility is useful for making sure those UI elements are pixel
perfect. A simple 2x/4x magnification around the mouse cursor, shown in
a window.

1 files changed, 27 insertions, 0 deletions

diff --git a/Userland/Applications/Magnifier/MagnifierWidget.h b/Userland/Applications/Magnifier/MagnifierWidget.h
new file mode 100644
index 0000000000..f58d7d54d5
--- /dev/null
+++ b/Userland/Applications/Magnifier/MagnifierWidget.h
@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2021, Valtteri Koskivuori <vkoskiv@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibGUI/Widget.h>
+#include <LibGfx/Point.h>
+
+class MagnifierWidget final : public GUI::Widget {
+    C_OBJECT(MagnifierWidget)
+
+public:
+    MagnifierWidget();
+    virtual ~MagnifierWidget();
+    void set_scale_factor(int scale_factor);
+    void track_cursor_globally();
+
+private:
+    virtual void timer_event(Core::TimerEvent&) override;
+    virtual void paint_event(GUI::PaintEvent&) override;
+
+    Gfx::IntPoint m_mouse_position;
+    int m_scale_factor { 2 };
+};