gui: Begin support to also preview results in plain text files

gui/previewresultplaintext.cpp

@@ -0,0 +1,30 @@
+#include "previewresultplaintext.h"
+
+PreviewResultPlainText::PreviewResultPlainText(const PreviewResult &o)
+{
+	this->documentPath = o.getDocumentPath();
+	this->page = o.getPage();
+}
+
+QWidget *PreviewResultPlainText::createPreviewWidget()
+{
+
+	ClickLabel *label = new ClickLabel();
+	label->setText(this->text);
+	label->setToolTip(getDocumentPath());
+	label->setStyleSheet("border: 1px solid black");
+	label->setMaximumWidth(768);
+	label->setMaximumHeight(512);
+	label->setTextFormat(Qt::RichText);
+	return label;
+}
+
+bool PreviewResultPlainText::hasPreview()
+{
+	return !text.isEmpty();
+}
+
+void PreviewResultPlainText::setText(QString text)
+{
+	this->text = text;
+}