Have a working model for showing the namespaces in a tree with checkboxes.

The namespaces are currently spit into user and system. Later we might
add recognizing namespaces introduced by specific modules/extensions.

pglab/NamespaceFilterWidget.cpp

@@ -0,0 +1,32 @@
+#include "NamespaceFilterWidget.h"
+#include "ui_NamespaceFilterWidget.h"
+
+#include "NamespaceItemModel.h"
+
+NamespaceFilterWidget::NamespaceFilterWidget(QWidget *parent) :
+	QWidget(parent),
+	ui(new Ui::NamespaceFilterWidget)
+{
+	ui->setupUi(this);
+
+	m_namespaceItemModel = new NamespaceItemModel(this);
+	ui->treeView->setModel(m_namespaceItemModel);
+	//ui->treeView->setModelColumn(0);
+}
+
+NamespaceFilterWidget::~NamespaceFilterWidget()
+{
+	delete ui;
+}
+
+void NamespaceFilterWidget::init(std::shared_ptr<const PgNamespaceContainer> nsc)
+{
+	m_namespaceItemModel->init(nsc);
+	ui->treeView->expandAll();
+}
+
+std::set<Oid> NamespaceFilterWidget::getCheckedNamespaces() const
+{
+	return m_namespaceItemModel->getCheckedNamespaces();
+}
+