logic: Directory list box now restricts the user to select files, directories or both if required

* split QtDirectoryListBox and QtStringListBox
* renamed QtDirectoryListBox to QtPathListBox
* extracted QtListItemWidget class to own file
* renamed QtListItemWidget to QtListBoxItem
* added SelectionPolicyType to QtPathListBox to allow for specifying if selecting files, directories or both should be allowed.

src/lib_gui/qt/element/QtPathListBox.cpp

@@ -0,0 +1,108 @@
+#include "qt/element/QtPathListBox.h"
+
+#include <QtGui/qevent.h>
+#include <QLabel>
+#include <QListWidget>
+#include <QMimeData>
+
+#include "qt/element/QtPathListBoxItem.h"
+
+QtPathListBox::QtPathListBox(QWidget *parent, const QString& listName, SelectionPolicyType selectionPolicy)
+	: QtListBox(parent, listName)
+	, m_selectionPolicy(selectionPolicy)
+{
+	QLabel* dropInfoText = new QLabel("Drop Files & Folders");
+	dropInfoText->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
+	dropInfoText->setObjectName("dropInfo");
+	dropInfoText->setAlignment(Qt::AlignRight);
+
+	addWidgetToBar(dropInfoText);
+}
+
+QtPathListBox::SelectionPolicyType QtPathListBox::getSelectionPolicy() const
+{
+	return m_selectionPolicy;
+}
+
+const FilePath& QtPathListBox::getRelativeRootDirectory() const
+{
+	return m_relativeRootDirectory;
+}
+
+void QtPathListBox::setRelativeRootDirectory(const FilePath& dir)
+{
+	m_relativeRootDirectory = dir;
+}
+
+std::vector<FilePath> QtPathListBox::getPathsAsDisplayed() const
+{
+	std::vector<FilePath> paths;
+	for (int i = 0; i < m_list->count(); ++i)
+	{
+		QtListBoxItem* widget = dynamic_cast<QtListBoxItem*>(m_list->itemWidget(m_list->item(i)));
+		paths.push_back(FilePath(widget->getText().toStdWString()));
+	}
+	return paths;
+}
+
+std::vector<FilePath> QtPathListBox::getPathsAsAbsolute() const
+{
+	std::vector<FilePath> paths = getPathsAsDisplayed();
+	for (FilePath& path: paths)
+	{
+		makeAbsolute(path);
+	}
+	return paths;
+}
+
+void QtPathListBox::setPaths(const std::vector<FilePath>& list, bool readOnly)
+{
+	clear();
+
+	for (FilePath path : list)
+	{
+		makeRelative(path);
+		QtListBoxItem* item = addListBoxItemWithText(QString::fromStdWString(path.wstr()));
+		item->setReadOnly(readOnly);
+	}
+}
+
+void QtPathListBox::makeAbsolute(FilePath& path) const
+{
+	if (!path.empty() && !path.isAbsolute() && !m_relativeRootDirectory.empty())
+	{
+		path = m_relativeRootDirectory.getConcatenated(path);
+	}
+}
+
+void QtPathListBox::makeRelative(FilePath& path) const
+{
+	if (!m_relativeRootDirectory.empty())
+	{
+		const FilePath relPath = path.getRelativeTo(m_relativeRootDirectory);
+		if (relPath.wstr().size() < path.wstr().size())
+		{
+			path = relPath;
+		}
+	}
+}
+
+void QtPathListBox::dropEvent(QDropEvent *event)
+{
+	foreach(QUrl url, event->mimeData()->urls())
+	{
+		FilePath path(url.toLocalFile().toStdWString());
+		makeRelative(path);
+		QtListBoxItem* item = addListBoxItemWithText(QString::fromStdWString(path.wstr()));
+	}
+}
+
+void QtPathListBox::dragEnterEvent(QDragEnterEvent *event)
+{
+	event->accept();
+}
+
+QtListBoxItem* QtPathListBox::createListBoxItem(QListWidgetItem* item)
+{
+	return new QtPathListBoxItem(this, item);
+}