FileManager: Start building a file manager.

FileManager/DirectoryView.h

@@ -0,0 +1,50 @@
+#pragma once
+
+#include <LibGUI/GWidget.h>
+#include <AK/Function.h>
+#include <sys/stat.h>
+
+class DirectoryView final : public GWidget {
+public:
+    DirectoryView(GWidget* parent);
+    virtual ~DirectoryView() override;
+
+    void open(const String& path);
+    void reload();
+
+    Function<void(const String&)> on_path_change;
+
+    int item_height() const { return 16; }
+    int item_count() const { return m_directories.size() + m_files.size(); }
+
+private:
+    virtual void paint_event(GPaintEvent&) override;
+    virtual void mousedown_event(GMouseEvent&) override;
+
+    Rect row_rect(int item_index) const;
+
+    struct Entry {
+        String name;
+        size_t size { 0 };
+        mode_t mode { 0 };
+
+        bool is_directory() const { return S_ISDIR(mode); }
+    };
+
+    const Entry& entry(size_t index) const
+    {
+        if (index < m_directories.size())
+            return m_directories[index];
+        return m_files[index - m_directories.size()];
+    }
+    const GraphicsBitmap& icon_for(const Entry&) const;
+    bool should_show_size_for(const Entry&) const;
+
+    Vector<Entry> m_files;
+    Vector<Entry> m_directories;
+
+    String m_path;
+    RetainPtr<GraphicsBitmap> m_directory_icon;
+    RetainPtr<GraphicsBitmap> m_file_icon;
+    RetainPtr<GraphicsBitmap> m_symlink_icon;
+};