Solves issue 11233

A new class has been created for manage the files displayed in
QTreeWidget.

This class inherits from QTreeWidgetItem and only redefines the
operator< function. Now it's possible order by size and dates.

2 files changed, 70 insertions, 5 deletions

diff --git a/lumina-fm/widgets/DirWidget.cpp b/lumina-fm/widgets/DirWidget.cpp
index ed1f4544..22879c1b 100644
--- a/lumina-fm/widgets/DirWidget.cpp
+++ b/lumina-fm/widgets/DirWidget.cpp
@@ -111,7 +111,7 @@ void DirWidget::setShowThumbnails(bool show){
 void DirWidget::setDetails(QList<DETAILTYPES> list){
   listDetails = list;
   //Need to re-create the header item as well
-    QTreeWidgetItem *it = new QTreeWidgetItem();
+    CQTreeWidgetItem *it = new CQTreeWidgetItem();
     int nmcol = -1; int typecol = -1;
     for(int t=0; t<listDetails.length(); t++){
       switch(listDetails[t]){
@@ -283,15 +283,16 @@ void DirWidget::LoadDir(QString dir, QList<LFileInfo> list){
     watcher->addPath(list[i].absoluteFilePath());
     if(showDetails){
       //Now create all the individual items for the details tree
-      QTreeWidgetItem *it;
+      CQTreeWidgetItem *it;
       bool addnew = false;
 	//See if an item already exists for this file
 	QList<QTreeWidgetItem*> items = treeWidget->findItems(list[i].fileName(),Qt::MatchExactly,0); //NOTE: This requires column 0 to be the name
 	if(items.isEmpty()){
-	    it = new QTreeWidgetItem();
+        it = new CQTreeWidgetItem();
 	    addnew = true;
 	}else{
-	    it = items.first();
+        // Safe downcasting because CQTreeWidgetItem only redefines the virtual function bool opearot<. Not new methos added.
+        it = static_cast<CQTreeWidgetItem *> (items.first());
 	}
 	//Now update the entry contents
 	it->setWhatsThis(0, QString(canmodify ? "cut": "copy")+"::::"+list[i].absoluteFilePath());
diff --git a/lumina-fm/widgets/DirWidget.h b/lumina-fm/widgets/DirWidget.h
index 2c971fd8..514b3e7f 100644
--- a/lumina-fm/widgets/DirWidget.h
+++ b/lumina-fm/widgets/DirWidget.h
@@ -22,6 +22,10 @@
 
 #define ZSNAPDIR QString("/.zfs/snapshot/")
 
+#ifndef DEBUG
+#define DEBUG 0
+#endif
+
 namespace Ui{
 	class DirWidget;
 };
@@ -154,4 +158,64 @@ protected:
 	void mouseReleaseEvent(QMouseEvent *);
 	
 };
-#endif
\ No newline at end of file
+
+/*
+ * Virtual class for managing the sort of folders/files items. The problem with base class is that it only manages texts fields and
+ * we have dates and sizes.
+ *
+ * On this class, we overwrite the function operator<.
+ */
+
+class CQTreeWidgetItem : public QTreeWidgetItem {
+public:
+    CQTreeWidgetItem(int type = Type) : QTreeWidgetItem(type) {}
+    CQTreeWidgetItem(const QStringList & strings, int type = Type) : QTreeWidgetItem(strings, type) {}
+    CQTreeWidgetItem(QTreeWidget * parent, int type = Type) : QTreeWidgetItem(parent, type) {}
+    CQTreeWidgetItem(QTreeWidget * parent, const QStringList & strings, int type = Type) : QTreeWidgetItem(parent, strings, type) {}
+    CQTreeWidgetItem(QTreeWidget * parent, QTreeWidgetItem * preceding, int type = Type) : QTreeWidgetItem(parent, preceding, type) {}
+    CQTreeWidgetItem(QTreeWidgetItem * parent, int type = Type) : QTreeWidgetItem(parent, type) {}
+    CQTreeWidgetItem(QTreeWidgetItem * parent, const QStringList & strings, int type = Type) : QTreeWidgetItem(parent, strings, type) {}
+    CQTreeWidgetItem(QTreeWidgetItem * parent, QTreeWidgetItem * preceding, int type = Type) : QTreeWidgetItem(parent, preceding, type) {}
+    virtual ~CQTreeWidgetItem() {}
+    inline virtual bool operator<(const QTreeWidgetItem &tmp) const {
+      int column = this->treeWidget()->sortColumn();
+      // We are in date text
+      if(column == DirWidget::DATEMOD || column == DirWidget::DATECREATE) {
+        // Get the stored text and try to convert to QDateTime
+        QString text = this->text(column);
+        QString text_tmp = tmp.text(column);
+        QDateTime date_time = QDateTime::fromString(text, Qt::DefaultLocaleShortDate);
+        QDateTime date_time_tmp = QDateTime::fromString(text_tmp, Qt::DefaultLocaleShortDate);
+        // If the conversion are ok in both objects, compare them
+        if(date_time.isValid() && date_time_tmp.isValid())
+          return date_time < date_time_tmp;
+        // If some of the dates are invalid, use the base class implementation (order by string)
+        else {
+          if(DEBUG)
+            qDebug() << "Cannot convert the date. Texts arrived are " << text << " and " << text_tmp;
+          return QTreeWidgetItem::operator <(tmp);
+        }
+      }
+      // We are in size text
+      else if(column == DirWidget::SIZE) {
+        QString text = this->text(column);
+        QString text_tmp = tmp.text(column);
+        double filesize, filesize_tmp;
+        // On folders, text is empty so we check for that
+        // In case we are in folders, we put -1 for differentiate of regular files with 0 bytes.
+        // Doing so, all folders we'll be together instead of mixing with files with 0 bytes.
+        if(text.isEmpty())
+          filesize = -1;
+        else
+          filesize = LUtils::DisplaySizeToBytes(text);
+        if(text_tmp.isEmpty())
+          filesize_tmp = -1;
+        else
+          filesize_tmp = LUtils::DisplaySizeToBytes(text_tmp);
+        return filesize < filesize_tmp;
+      }
+      // In other cases, we trust base class implementation
+      return QTreeWidgetItem::operator<(tmp);
+    }
+};
+#endif