LibGUI: Start working on a GTreeView class.

Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/12ec55ee743

LibGUI/GTreeView.cpp

@@ -0,0 +1,21 @@
+#include <LibGUI/GTreeView.h>
+#include <LibGUI/GPainter.h>
+
+GTreeView::GTreeView(GWidget* parent)
+    : GAbstractView(parent)
+{
+}
+
+GTreeView::~GTreeView()
+{
+}
+
+void GTreeView::paint_event(GPaintEvent& event)
+{
+    GFrame::paint_event(event);
+    GPainter painter(*this);
+    painter.set_clip_rect(frame_inner_rect());
+    painter.set_clip_rect(event.rect());
+
+    painter.fill_rect(event.rect(), Color::White);
+}

LibGUI/GTreeView.h

@@ -0,0 +1,16 @@
+#pragma once
+
+#include <LibGUI/GAbstractView.h>
+
+class GTreeView : public GAbstractView {
+public:
+    explicit GTreeView(GWidget*);
+    virtual ~GTreeView() override;
+
+    virtual const char* class_name() const override { return "GTreeView"; }
+
+protected:
+    virtual void paint_event(GPaintEvent&) override;
+
+private:
+};

LibGUI/Makefile

@@ -54,6 +54,7 @@ LIBGUI_OBJS = \
     GIcon.o \
     GElapsedTimer.o \
     GFrame.o \
+    GTreeView.o \
     GWindow.o
 
 OBJS = $(SHAREDGRAPHICS_OBJS) $(LIBGUI_OBJS)