QuickShow: Browse the files in the same folder

Applications/QuickShow/QSWidget.cpp

@@ -25,6 +25,8 @@
  */
 
 #include "QSWidget.h"
+#include <AK/StringBuilder.h>
+#include <LibCore/DirIterator.h>
 #include <LibGUI/MessageBox.h>
 #include <LibGUI/Painter.h>
 #include <LibGUI/Window.h>
@@ -40,6 +42,57 @@ QSWidget::~QSWidget()
 {
 }
 
+void QSWidget::navigate(Directions direction)
+{
+    if (m_path == nullptr)
+        return;
+
+    auto parts = m_path.split('/');
+    parts.remove(parts.size() - 1);
+    StringBuilder sb;
+    sb.append("/");
+    sb.join("/", parts);
+    AK::String current_dir = sb.to_string();
+
+    if (m_files_in_same_dir.is_empty()) {
+        Core::DirIterator iterator(current_dir, Core::DirIterator::Flags::SkipDots);
+        while (iterator.has_next()) {
+            String file = iterator.next_full_path();
+            if (!file.ends_with(".png")) // TODO: Find a batter way to filter supported images.
+                continue;
+            m_files_in_same_dir.append(file);
+        }
+    }
+
+    auto current_index = m_files_in_same_dir.find_first_index(m_path);
+    if (!current_index.has_value()) {
+        return;
+    }
+
+    size_t index = current_index.value();
+    if (direction == Directions::Back) {
+        if (index == 0) {
+            GUI::MessageBox::show(String::format("This is the first file.", index), "Cannot open image", GUI::MessageBox::Type::Error, GUI::MessageBox::InputType::OK, window());
+            return;
+        }
+
+        index--;
+    } else if (direction == Directions::Forward) {
+        if (index == m_files_in_same_dir.size() - 1) {
+            GUI::MessageBox::show(String::format("This is the last file.", index), "Cannot open image", GUI::MessageBox::Type::Error, GUI::MessageBox::InputType::OK, window());
+            return;
+        }
+
+        index++;
+    } else if (direction == Directions::First) {
+        index = 0;
+    } else if (direction == Directions::Last) {
+        index = m_files_in_same_dir.size() - 1;
+    }
+
+    this->load_from_file(m_files_in_same_dir.at(index));
+}
+
 void QSWidget::relayout()
 {
     if (m_bitmap.is_null())

Applications/QuickShow/QSWidget.h

@@ -34,11 +34,19 @@ class QSLabel;
 class QSWidget final : public GUI::Frame {
     C_OBJECT(QSWidget)
 public:
+    enum Directions {
+        First,
+        Back,
+        Forward,
+        Last
+    };
+
     virtual ~QSWidget() override;
 
     const Gfx::Bitmap* bitmap() const { return m_bitmap.ptr(); }
     const String& path() const { return m_path; }
 
+    void navigate(Directions);
     void load_from_file(const String&);
 
     Function<void(int)> on_scale_change;
@@ -65,4 +73,5 @@ private:
 
     Gfx::Point m_click_position;
     Gfx::FloatPoint m_saved_pan_origin;
+    Vector<String> m_files_in_same_dir;
 };

Applications/QuickShow/main.cpp

@@ -102,6 +102,27 @@ int main(int argc, char** argv)
         }
     };
 
+    // Actions
+    auto go_first_action = GUI::Action::create("First", { Mod_None, Key_Home }, Gfx::Bitmap::load_from_file("/res/icons/16x16/go-first.png"),
+        [&](auto&) {
+            widget.navigate(QSWidget::Directions::First);
+        });
+
+    auto go_back_action = GUI::Action::create("Back", { Mod_None, Key_Left }, Gfx::Bitmap::load_from_file("/res/icons/16x16/go-back.png"),
+        [&](auto&) {
+            widget.navigate(QSWidget::Directions::Back);
+        });
+
+    auto go_forward_action = GUI::Action::create("Forward", { Mod_None, Key_Right }, Gfx::Bitmap::load_from_file("/res/icons/16x16/go-forward.png"),
+        [&](auto&) {
+            widget.navigate(QSWidget::Directions::Forward);
+        });
+
+    auto go_last_action = GUI::Action::create("Last", { Mod_None, Key_End }, Gfx::Bitmap::load_from_file("/res/icons/16x16/go-last.png"),
+        [&](auto&) {
+            widget.navigate(QSWidget::Directions::Last);
+        });
+
     auto menubar = make<GUI::MenuBar>();
 
     auto& app_menu = menubar->add_menu("QuickShow");
@@ -116,6 +137,12 @@ int main(int argc, char** argv)
         app.quit();
     }));
 
+    auto& navigate_menu = menubar->add_menu("Navigate");
+    navigate_menu.add_action(go_first_action);
+    navigate_menu.add_action(go_back_action);
+    navigate_menu.add_action(go_forward_action);
+    navigate_menu.add_action(go_last_action);
+
     auto& help_menu = menubar->add_menu("Help");
     help_menu.add_action(GUI::Action::create("About", [&](auto&) {
         GUI::AboutDialog::show("QuickShow", Gfx::Bitmap::load_from_file("/res/icons/32x32/filetype-image.png"), window);