Generalize previews: Add PreviewResult,PreviewResultPdf, remove PdfPreview

gui/previewresultpdf.cpp

@@ -0,0 +1,21 @@
+#include "previewresultpdf.h"
+
+PreviewResultPdf::PreviewResultPdf(const PreviewResult &o)
+{
+	this->documentPath = o.getDocumentPath();
+	this->page = o.getPage();
+}
+
+QWidget *PreviewResultPdf::createPreviewWidget()
+{
+	ClickLabel *label = new ClickLabel();
+	label->setPixmap(QPixmap::fromImage(previewImage));
+	label->setToolTip(getDocumentPath());
+	return label;
+}
+
+bool PreviewResultPdf::hasPreview()
+{
+	bool result = !this->previewImage.isNull();
+	return result;
+}