Added support for automatically detecting new patterns in the pattern library directory

include/structurelibraryview.hpp

@@ -8,6 +8,7 @@
 
 #include <QDir>
 #include <QTreeWidgetItem>
+#include <QFileSystemWatcher>
 
 #include "structure.hpp"
 
@@ -37,6 +38,7 @@ private slots:
 
 private:
     Ui::StructureLibraryView *ui;
+    QFileSystemWatcher m_watcher;
 };
 
 #endif // STRUCTURELIBRARYVIEW_HPP

src/structurelibraryview.cpp

@@ -20,6 +20,10 @@ StructureLibraryView::StructureLibraryView(QWidget *parent) :
 
     connect(ui->tree, &QTreeWidget::itemClicked, this, &StructureLibraryView::update_info);
     connect(ui->button_copy, &QPushButton::pressed, this, &StructureLibraryView::copy_button_clicked);
+    connect(&m_watcher, &QFileSystemWatcher::directoryChanged, [this](const QString&)
+    {
+        load_structures();
+    });
 }
 
 StructureLibraryView::~StructureLibraryView()
@@ -29,8 +33,12 @@ StructureLibraryView::~StructureLibraryView()
 
 void StructureLibraryView::load_structures()
 {
+    // clear the previously watched directories
+    m_watcher.removePaths(m_watcher.directories());
+
     QTreeWidgetItem* pattern_list = add_directory_contents(QDir("patterns/"));
     pattern_list->setText(0, "Patterns");
+    ui->tree->clear();
     ui->tree->addTopLevelItem(pattern_list);
     pattern_list->setExpanded(true);
 }
@@ -67,6 +75,9 @@ QTreeWidgetItem *StructureLibraryView::add_directory_contents(const QDir &dir)
         root->addChild(child);
     }
 
+    // register this directory for filesystem watching
+    m_watcher.addPath(dir.absolutePath());
+
     return root;
 }