PluginBrowser: Tree layout and search bar

include/PluginBrowser.h

@@ -31,6 +31,10 @@
 #include "SideBarWidget.h"
 #include "Plugin.h"
 
+class QLineEdit;
+class QTreeWidget;
+class QTreeWidgetItem;
+
 
 class PluginBrowser : public SideBarWidget
 {
@@ -39,18 +43,18 @@ public:
 	PluginBrowser( QWidget * _parent );
 	virtual ~PluginBrowser() = default;
 
+private slots:
+	void onFilterChanged( const QString & filter );
+
 private:
+	void addPlugins();
+	void updateRootVisibility( int index );
+	void updateRootVisibilities();
+
 	QWidget * m_view;
-};
-
-
-
-
-class PluginDescList : public QWidget
-{
-	Q_OBJECT
-public:
-	PluginDescList(QWidget* parent);
+	QTreeWidget * m_descTree;
+	QTreeWidgetItem * m_lmmsRoot;
+	QTreeWidgetItem * m_lv2Root;
 };
 
 
@@ -62,6 +66,7 @@ class PluginDescWidget : public QWidget
 public:
 	typedef Plugin::Descriptor::SubPluginFeatures::Key PluginKey;
 	PluginDescWidget( const PluginKey & _pk, QWidget * _parent );
+	QString name() const;
 
 
 protected:

src/gui/PluginBrowser.cpp

@@ -24,11 +24,13 @@
 
 #include "PluginBrowser.h"
 
+#include <QHeaderView>
 #include <QLabel>
-#include <QPainter>
+#include <QLineEdit>
 #include <QMouseEvent>
-#include <QScrollArea>
+#include <QPainter>
 #include <QStyleOption>
+#include <QTreeWidget>
 
 #include "embed.h"
 #include "Engine.h"
@@ -60,23 +62,91 @@ PluginBrowser::PluginBrowser( QWidget * _parent ) :
 								m_view );
 	hint->setWordWrap( true );
 
-	QScrollArea* scrollarea = new QScrollArea( m_view );
-	PluginDescList* descList = new PluginDescList( m_view );
-	scrollarea->setWidget(descList);
-	scrollarea->setWidgetResizable(true);
+	QLineEdit * searchBar = new QLineEdit( m_view );
+	searchBar->setPlaceholderText( "Search" );
+	searchBar->setMaxLength( 64 );
+	searchBar->setClearButtonEnabled( true );
 
-	view_layout->addWidget(hint);
-	view_layout->addWidget(scrollarea);
+	m_descTree = new QTreeWidget( m_view );
+	m_descTree->setColumnCount( 1 );
+	m_descTree->header()->setVisible( false );
+	m_descTree->setIndentation( 10 );
+	m_descTree->setSelectionMode( QAbstractItemView::NoSelection );
+
+	connect( searchBar, SIGNAL( textEdited( const QString & ) ),
+			this, SLOT( onFilterChanged( const QString & ) ) );
+
+	view_layout->addWidget( hint );
+	view_layout->addWidget( searchBar );
+	view_layout->addWidget( m_descTree );
+
+	// Add LMMS root to the tree
+	m_lmmsRoot = new QTreeWidgetItem();
+	m_lmmsRoot->setText( 0, "LMMS" );
+	m_descTree->insertTopLevelItem( 0, m_lmmsRoot );
+	m_lmmsRoot->setExpanded( true );
+
+	// Add LV2 root to the tree
+	m_lv2Root = new QTreeWidgetItem();
+	m_lv2Root->setText( 0, "LV2" );
+	m_descTree->insertTopLevelItem( 1, m_lv2Root );
+
+	// Add plugins to the tree roots
+	addPlugins();
+
+	// Resize
+	m_descTree->header()->setSectionResizeMode( QHeaderView::ResizeToContents );
+
+	// Hide empty roots
+	updateRootVisibilities();
 }
 
 
-
-
-PluginDescList::PluginDescList(QWidget *parent) :
-	QWidget(parent)
+void PluginBrowser::updateRootVisibility( int rootIndex )
 {
-	QVBoxLayout* layout = new QVBoxLayout(this);
+	QTreeWidgetItem * root = m_descTree->topLevelItem( rootIndex );
+	root->setHidden( !root->childCount() );
+}
 
+
+void PluginBrowser::updateRootVisibilities()
+{
+	int rootCount = m_descTree->topLevelItemCount();
+	for (int rootIndex = 0; rootIndex < rootCount; ++rootIndex)
+	{
+		updateRootVisibility( rootIndex );
+	}
+}
+
+
+void PluginBrowser::onFilterChanged( const QString & filter )
+{
+	int rootCount = m_descTree->topLevelItemCount();
+	for (int rootIndex = 0; rootIndex < rootCount; ++rootIndex)
+	{
+		QTreeWidgetItem * root = m_descTree->topLevelItem( rootIndex );
+
+		int itemCount = root->childCount();
+		for (int itemIndex = 0; itemIndex < itemCount; ++itemIndex)
+		{
+			QTreeWidgetItem * item = root->child( itemIndex );
+			PluginDescWidget * descWidget = static_cast<PluginDescWidget *>
+							(m_descTree->itemWidget( item, 0));
+			if (descWidget->name().contains(filter, Qt::CaseInsensitive))
+			{
+				item->setHidden( false );
+			}
+			else
+			{
+				item->setHidden( true );
+			}
+		}
+	}
+}
+
+
+void PluginBrowser::addPlugins()
+{
 	QList<Plugin::Descriptor*> descs = pluginFactory->descriptors(Plugin::Instrument);
 	std::sort(
 			descs.begin(),
@@ -93,7 +163,7 @@ PluginDescList::PluginDescList(QWidget *parent) :
 
 	for (const Plugin::Descriptor* desc: descs)
 	{
-		if( desc->subPluginFeatures )
+		if ( desc->subPluginFeatures )
 		{
 			desc->subPluginFeatures->listSubPluginKeys(
 							desc,
@@ -109,13 +179,18 @@ PluginDescList::PluginDescList(QWidget *parent) :
 
 	for (const PluginKey& key : pluginKeys)
 	{
-		PluginDescWidget* p = new PluginDescWidget( key, this );
-		p->show();
-		layout->addWidget(p);
+		QTreeWidgetItem * item = new QTreeWidgetItem();
+		if ( key.desc->name == QStringLiteral("lv2instrument") )
+		{
+			m_lv2Root->addChild( item );
+		}
+		else
+		{
+			m_lmmsRoot->addChild( item );
+		}
+		PluginDescWidget* p = new PluginDescWidget( key, m_descTree );
+		m_descTree->setItemWidget( item, 0, p );
 	}
-
-	setLayout(layout);
-	layout->addStretch();
 }
 
 
@@ -137,6 +212,14 @@ PluginDescWidget::PluginDescWidget(const PluginKey &_pk,
 
 
 
+QString PluginDescWidget::name() const
+{
+	return m_pluginKey.displayName();
+}
+
+
+
+
 void PluginDescWidget::paintEvent( QPaintEvent * )
 {
 
@@ -190,7 +273,7 @@ void PluginDescWidget::leaveEvent( QEvent * _e )
 
 void PluginDescWidget::mousePressEvent( QMouseEvent * _me )
 {
-	if( _me->button() == Qt::LeftButton )
+	if ( _me->button() == Qt::LeftButton )
 	{
 		Engine::setDndPluginKey(&m_pluginKey);
 		new StringPairDrag("instrument",