FileManager: Start building a file manager.

FileManager/DirectoryView.cpp

@@ -0,0 +1,126 @@
+#include <dirent.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <SharedGraphics/GraphicsBitmap.h>
+#include <SharedGraphics/Painter.h>
+#include <AK/FileSystemPath.h>
+#include "DirectoryView.h"
+
+DirectoryView::DirectoryView(GWidget* parent)
+    : GWidget(parent)
+{
+    m_directory_icon = GraphicsBitmap::load_from_file("/res/icons/folder16.rgb", { 16, 16 });
+    m_file_icon = GraphicsBitmap::load_from_file("/res/icons/file16.rgb", { 16, 16 });
+    m_symlink_icon = GraphicsBitmap::load_from_file("/res/icons/link16.rgb", { 16, 16 });
+}
+
+DirectoryView::~DirectoryView()
+{
+}
+
+void DirectoryView::open(const String& path)
+{
+    if (m_path == path)
+        return;
+    m_path = path;
+    reload();
+    if (on_path_change)
+        on_path_change(m_path);
+    update();
+}
+
+void DirectoryView::reload()
+{
+    DIR* dirp = opendir(m_path.characters());
+    if (!dirp) {
+        perror("opendir");
+        exit(1);
+    }
+    m_directories.clear();
+    m_files.clear();
+    while (auto* de = readdir(dirp)) {
+        Entry entry;
+        entry.name = de->d_name;
+        struct stat st;
+        int rc = lstat(String::format("%s/%s", m_path.characters(), de->d_name).characters(), &st);
+        if (rc < 0) {
+            perror("lstat");
+            continue;
+        }
+        entry.size = st.st_size;
+        entry.mode = st.st_mode;
+        auto& entries = S_ISDIR(st.st_mode) ? m_directories : m_files;
+        entries.append(move(entry));
+    }
+    closedir(dirp);
+}
+
+const GraphicsBitmap& DirectoryView::icon_for(const Entry& entry) const
+{
+    if (S_ISDIR(entry.mode))
+        return *m_directory_icon;
+    if (S_ISLNK(entry.mode))
+        return *m_symlink_icon;
+    return *m_file_icon;
+}
+
+static String pretty_byte_size(size_t size)
+{
+    return String::format("%u", size);
+}
+
+bool DirectoryView::should_show_size_for(const Entry& entry) const
+{
+    return S_ISREG(entry.mode);
+}
+
+Rect DirectoryView::row_rect(int item_index) const
+{
+    return { 0, item_index * item_height(), width(), item_height() };
+}
+
+void DirectoryView::mousedown_event(GMouseEvent& event)
+{
+    for (int i = 0; i < item_count(); ++i) {
+        if (row_rect(i).contains(event.position())) {
+            auto& entry = this->entry(i);
+            if (entry.is_directory()) {
+                FileSystemPath new_path(String::format("%s/%s", m_path.characters(), entry.name.characters()));
+                open(new_path.string());
+            }
+        }
+    }
+}
+
+void DirectoryView::paint_event(GPaintEvent&)
+{
+    Painter painter(*this);
+
+    int horizontal_padding = 5;
+    int icon_size = 16;
+    int painted_item_index = 0;
+
+    auto process_entries = [&] (const Vector<Entry>& entries) {
+        for (size_t i = 0; i < entries.size(); ++i, ++painted_item_index) {
+            auto& entry = entries[i];
+            int y = painted_item_index * item_height();
+            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.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))
+                painter.draw_text(size_rect, pretty_byte_size(entry.size), Painter::TextAlignment::CenterRight, Color::Black);
+        }
+    };
+
+    process_entries(m_directories);
+    process_entries(m_files);
+
+    Rect unpainted_rect(0, painted_item_index * item_height(), width(), height());
+    unpainted_rect.intersect(rect());
+    painter.fill_rect(unpainted_rect, Color::White);
+}