projectpanel/projectexplorer: added select all/deselect all functionality

app/panel/project/project.cpp

@@ -103,6 +103,16 @@ ProjectViewModel *ProjectPanel::model()
   return explorer_->model();
 }
 
+void ProjectPanel::SelectAll()
+{
+  explorer_->SelectAll();
+}
+
+void ProjectPanel::DeselectAll()
+{
+  explorer_->DeselectAll();
+}
+
 void ProjectPanel::Edit(Item* item)
 {
   explorer_->Edit(item);

app/panel/project/project.h

@@ -43,6 +43,9 @@ public:
 
   ProjectViewModel* model();
 
+  virtual void SelectAll() override;
+  virtual void DeselectAll() override;
+
 public slots:
   void Edit(Item *item);
 

app/widget/projectexplorer/projectexplorer.cpp

@@ -349,3 +349,13 @@ ProjectViewModel *ProjectExplorer::model()
 {
   return &model_;
 }
+
+void ProjectExplorer::SelectAll()
+{
+  CurrentView()->selectAll();
+}
+
+void ProjectExplorer::DeselectAll()
+{
+  CurrentView()->selectionModel()->clearSelection();
+}

app/widget/projectexplorer/projectexplorer.h

@@ -1,4 +1,4 @@
-/***
+/***
 
   Olive - Non-Linear Video Editor
   Copyright (C) 2019 Olive Team
@@ -73,6 +73,10 @@ public:
    */
   ProjectViewModel* model();
 
+  void SelectAll();
+
+  void DeselectAll();
+
 public slots:
   void set_view_type(ProjectToolbar::ViewType type);