FileManager: Show info about currently selected items in statusbar

When there's a non-zero number of selected items, we now show the
number in the statusbar, along with the total selected file size. :^)

Fixes #271.

3 files changed, 42 insertions, 16 deletions

diff --git a/Applications/FileManager/DirectoryView.cpp b/Applications/FileManager/DirectoryView.cpp
index d3aa3e5068..31bdb6cce1 100644
--- a/Applications/FileManager/DirectoryView.cpp
+++ b/Applications/FileManager/DirectoryView.cpp
@@ -69,12 +69,7 @@ DirectoryView::DirectoryView(GWidget* parent)
     m_item_view->set_model_column(GDirectoryModel::Column::Name);
 
     m_table_view->model()->on_update = [this] {
-        set_status_message(String::format("%d item%s (%u byte%s)",
-            model().row_count(),
-            model().row_count() != 1 ? "s" : "",
-            model().bytes_in_files(),
-            model().bytes_in_files() != 1 ? "s" : ""));
-
+        update_statusbar();
         if (on_path_change)
             on_path_change(model().path());
     };
@@ -92,13 +87,15 @@ DirectoryView::DirectoryView(GWidget* parent)
         handle_activation(filter_model.map_to_target(index));
     };
 
-    m_table_view->on_selection = [this](const GModelIndex&) {
-        if (on_selection)
-            on_selection(*m_table_view);
+    m_table_view->on_selection_change = [this] {
+        update_statusbar();
+        if (on_selection_change)
+            on_selection_change(*m_table_view);
     };
-    m_item_view->on_selection = [this](const GModelIndex&) {
-        if (on_selection)
-            on_selection(*m_item_view);
+    m_item_view->on_selection_change = [this] {
+        update_statusbar();
+        if (on_selection_change)
+            on_selection_change(*m_item_view);
     };
 
     set_view_mode(ViewMode::Icon);
@@ -172,3 +169,30 @@ void DirectoryView::open_next_directory()
         model().open(m_path_history[m_path_history_position]);
     }
 }
+
+void DirectoryView::update_statusbar()
+{
+    if (current_view().selection().is_empty()) {
+        set_status_message(String::format("%d item%s (%u byte%s)",
+            model().row_count(),
+            model().row_count() != 1 ? "s" : "",
+            model().bytes_in_files(),
+            model().bytes_in_files() != 1 ? "s" : ""));
+        return;
+    }
+
+    int selected_item_count = current_view().selection().size();
+    size_t selected_byte_count = 0;
+
+    current_view().selection().for_each_index([&](auto& index) {
+        auto size_index = current_view().model()->index(index.row(), GDirectoryModel::Column::Size);
+        auto file_size = current_view().model()->data(size_index).to_int();
+        selected_byte_count += file_size;
+    });
+
+    set_status_message(String::format("%d item%s selected (%u byte%s)",
+        selected_item_count,
+        selected_item_count != 1 ? "s" : "",
+        selected_byte_count,
+        selected_byte_count != 1 ? "s" : ""));
+}
diff --git a/Applications/FileManager/DirectoryView.h b/Applications/FileManager/DirectoryView.h
index 6a3bb9c76d..458f8cf065 100644
--- a/Applications/FileManager/DirectoryView.h
+++ b/Applications/FileManager/DirectoryView.h
@@ -24,7 +24,7 @@ public:
     void refresh();
 
     Function<void(const StringView&)> on_path_change;
-    Function<void(GAbstractView&)> on_selection;
+    Function<void(GAbstractView&)> on_selection_change;
     Function<void(const StringView&)> on_status_message;
     Function<void(int done, int total)> on_thumbnail_progress;
 
@@ -62,6 +62,7 @@ private:
     void handle_activation(const GModelIndex&);
 
     void set_status_message(const StringView&);
+    void update_statusbar();
 
     ViewMode m_view_mode { Invalid };
 
diff --git a/Applications/FileManager/main.cpp b/Applications/FileManager/main.cpp
index 0c4dd836c0..257c77955c 100644
--- a/Applications/FileManager/main.cpp
+++ b/Applications/FileManager/main.cpp
@@ -93,11 +93,12 @@ int main(int argc, char** argv)
         directory_view->open_parent_directory();
     });
 
-    directory_view->on_selection = [&](GAbstractView& view) {
+    directory_view->on_selection_change = [&](GAbstractView& view) {
         Vector<String> paths;
-        auto model = static_cast<GDirectoryModel*>(view.model());
+        auto& model = *view.model();
         view.selection().for_each_index([&](const GModelIndex& index) {
-            auto path = model->entry(index.row()).full_path(*model);
+            auto name_index = model.index(index.row(), GDirectoryModel::Column::Name);
+            auto path = model.data(name_index, GModel::Role::Custom).to_string();
             paths.append(path);
         });
         selected_file_paths = paths;