LibGUI: Add a simple GGroupBox widget.

This needs some work on the visual side, but it gets the job done already.

LibGUI/GGroupBox.cpp

@@ -0,0 +1,31 @@
+#include <LibGUI/GGroupBox.h>
+#include <LibGUI/GPainter.h>
+#include <SharedGraphics/StylePainter.h>
+
+GGroupBox::GGroupBox(const String& name, GWidget* parent)
+    : GWidget(parent)
+    , m_name(name)
+{
+    set_fill_with_background_color(true);
+    set_background_color(Color::LightGray);
+}
+
+GGroupBox::~GGroupBox()
+{
+}
+
+void GGroupBox::paint_event(GPaintEvent& event)
+{
+    GPainter painter(*this);
+    painter.add_clip_rect(event.rect());
+
+    Rect frame_rect {
+        0, font().glyph_height() / 2,
+        width(), height() - font().glyph_height() / 2
+    };
+    StylePainter::paint_frame(painter, frame_rect, FrameShape::Panel, FrameShadow::Sunken, 1);
+
+    Rect text_rect { 4, 0, font().width(m_name) + 6, font().glyph_height() };
+    painter.fill_rect(text_rect, background_color());
+    painter.draw_text(text_rect, m_name, TextAlignment::Center, foreground_color());
+}

LibGUI/GGroupBox.h

@@ -0,0 +1,19 @@
+#pragma once
+
+#include <LibGUI/GWidget.h>
+
+class GGroupBox : public GWidget {
+public:
+    GGroupBox(const String& name, GWidget* parent);
+    virtual ~GGroupBox() override;
+
+    String name() const { return m_name; }
+
+    virtual const char* class_name() const override { return "GGroupBox"; }
+
+protected:
+    virtual void paint_event(GPaintEvent&) override;
+
+private:
+    String m_name;
+};

LibGUI/Makefile

@@ -64,6 +64,7 @@ LIBGUI_OBJS = \
     GHttpResponse.o \
     GHttpJob.o \
     GSpinBox.o \
+    GGroupBox.o \
     GWindow.o
 
 OBJS = $(SHAREDGRAPHICS_OBJS) $(LIBGUI_OBJS)