LibGUI: Start adding an automatic widget layout system.

My needs are really quite simple, so I'm just going to add what I need
as I go along. The first thing I needed was a simple box layout with
widgets being able to say whether they prefer fixed or fill for both
their vertical and horizontal sizes.

I also made a simple GStatusBar so FileManager can show how many bytes
worth of files are in the current directory.

Applications/FileManager/DirectoryView.cpp

@@ -53,6 +53,8 @@ void DirectoryView::reload()
     }
     m_directories.clear();
     m_files.clear();
+
+    size_t bytes_in_files = 0;
     while (auto* de = readdir(dirp)) {
         Entry entry;
         entry.name = de->d_name;
@@ -66,10 +68,21 @@ void DirectoryView::reload()
         entry.mode = st.st_mode;
         auto& entries = S_ISDIR(st.st_mode) ? m_directories : m_files;
         entries.append(move(entry));
+
+        if (S_ISREG(entry.mode))
+            bytes_in_files += st.st_size;
     }
     closedir(dirp);
     int excess_height = max(0, (item_count() * item_height()) - height());
     m_scrollbar->set_range(0, excess_height);
+
+
+
+    set_status_message(String::format("%d item%s (%u byte%s)",
+                                      item_count(),
+                                      item_count() != 1 ? "s" : "",
+                                      bytes_in_files,
+                                      bytes_in_files != 1 ? "s" : ""));
 }
 
 const GraphicsBitmap& DirectoryView::icon_for(const Entry& entry) const
@@ -128,7 +141,7 @@ void DirectoryView::paint_event(GPaintEvent&)
             Rect icon_rect(horizontal_padding, y, icon_size, item_height());
             Rect name_rect(icon_rect.right() + horizontal_padding, y, 100, item_height());
             Rect size_rect(name_rect.right() + horizontal_padding, y, 64, item_height());
-            painter.fill_rect(row_rect(painted_item_index), i % 2 ? Color::LightGray : Color::White);
+            painter.fill_rect(row_rect(painted_item_index), i % 2 ? Color(210, 210, 210) : Color::White);
             painter.blit_with_alpha(icon_rect.location(), icon_for(entry), { 0, 0, icon_size, icon_size });
             painter.draw_text(name_rect, entry.name, Painter::TextAlignment::CenterLeft, Color::Black);
             if (should_show_size_for(entry))
@@ -143,3 +156,9 @@ void DirectoryView::paint_event(GPaintEvent&)
     unpainted_rect.intersect(rect());
     painter.fill_rect(unpainted_rect, Color::White);
 }
+
+void DirectoryView::set_status_message(String&& message)
+{
+    if (on_status_message)
+        on_status_message(move(message));
+}

Applications/FileManager/DirectoryView.h

@@ -15,6 +15,7 @@ public:
     void reload();
 
     Function<void(const String&)> on_path_change;
+    Function<void(String)> on_status_message;
 
     int item_height() const { return 16; }
     int item_count() const { return m_directories.size() + m_files.size(); }
@@ -24,6 +25,8 @@ private:
     virtual void resize_event(GResizeEvent&) override;
     virtual void mousedown_event(GMouseEvent&) override;
 
+    void set_status_message(String&&);
+
     Rect row_rect(int item_index) const;
 
     struct Entry {

Applications/FileManager/Makefile

@@ -23,7 +23,7 @@ LDFLAGS = -static --strip-debug -melf_i386 -e _start --gc-sections
 all: $(APP)
 
 $(APP): $(OBJS)
-	$(LD) -o $(APP) $(LDFLAGS) $(OBJS) ../LibGUI/LibGUI.a ../LibC/LibC.a
+	$(LD) -o $(APP) $(LDFLAGS) $(OBJS) ../../LibGUI/LibGUI.a ../../LibC/LibC.a
 
 .cpp.o:
 	@echo "CXX $<"; $(CXX) $(CXXFLAGS) -o $@ -c $<

Applications/FileManager/main.cpp

@@ -1,14 +1,10 @@
-#include <SharedGraphics/GraphicsBitmap.h>
 #include <LibGUI/GWindow.h>
 #include <LibGUI/GWidget.h>
-#include <LibGUI/GButton.h>
-#include <LibGUI/GListBox.h>
+#include <LibGUI/GBoxLayout.h>
 #include <LibGUI/GEventLoop.h>
-#include <sys/wait.h>
-#include <signal.h>
+#include <LibGUI/GStatusBar.h>
 #include <unistd.h>
 #include <stdio.h>
-#include <errno.h>
 #include "DirectoryView.h"
 
 static GWindow* make_window();
@@ -33,13 +29,21 @@ GWindow* make_window()
     auto* widget = new GWidget;
     window->set_main_widget(widget);
 
+    widget->set_layout(make<GBoxLayout>(Orientation::Vertical));
+
     auto* directory_view = new DirectoryView(widget);
-    directory_view->set_relative_rect({ 0, 0, 240, 300 });
+
+    auto* statusbar = new GStatusBar(widget);
+    statusbar->set_text("Welcome!");
 
     directory_view->on_path_change = [window] (const String& new_path) {
         window->set_title(String::format("FileManager: %s", new_path.characters()));
     };
 
+    directory_view->on_status_message = [statusbar] (String message) {
+        statusbar->set_text(move(message));
+    };
+
     directory_view->open("/");
 
     return window;