Another large speed boost for lumina-fm:

1) When refreshing a directory - don't re-load any already-loaded thumbnails
2) When loading the directory items or loading thumbnails, don't use a hard-coded item count for when to processEvents, instead use a time-based system (process events every second of loading time). This allows fast systems to use their speed while not penalizing slow systems)

Also disable the use of the backend file cache for lumina-fm: the time saved is so small that it is not worth the risk of missing changes to directory contents on rapid refreshes.

1 files changed, 22 insertions, 11 deletions

diff --git a/lumina-fm/widgets/DirWidget.cpp b/lumina-fm/widgets/DirWidget.cpp
index 5b994a85..8f4ed9f1 100644
--- a/lumina-fm/widgets/DirWidget.cpp
+++ b/lumina-fm/widgets/DirWidget.cpp
@@ -211,6 +211,7 @@ void DirWidget::LoadDir(QString dir, QList<LFileInfo> list){
     listWidget->setWhatsThis("");
     treeWidget->setWhatsThis("");
   }
+  bool updateThumbs = (lastdir != CDIR);
   //Determine if this is an internal ZFS snapshot
   bool loadsnaps = false;
   if(DEBUG){ qDebug() << "Load Snap Info:" << time.elapsed(); }
@@ -267,7 +268,7 @@ void DirWidget::LoadDir(QString dir, QList<LFileInfo> list){
   //Clear the display widget (if a new directory)
     if(DEBUG){ qDebug() << "Clear Browser Widget:" << time.elapsed(); }
   double scrollpercent = -1;
-  needThumbs.clear();
+  if(updateThumbs){ needThumbs.clear(); }
   if(lastbasedir != normalbasedir){
     if(showDetails){ treeWidget->clear(); }
     else{ listWidget->clear(); }
@@ -280,6 +281,7 @@ void DirWidget::LoadDir(QString dir, QList<LFileInfo> list){
     if(showDetails){
       for(int i=0; i<treeWidget->topLevelItemCount(); i++){
         if( !newfiles.contains(treeWidget->topLevelItem(i)->whatsThis(0).section("/",-1)) ){
+	  if(!updateThumbs){ needThumbs.removeAll( treeWidget->topLevelItem(i)->whatsThis(0).section("::::",1,50)); }
 	  delete treeWidget->takeTopLevelItem(i); 
 	  i--;
 	}
@@ -289,6 +291,7 @@ void DirWidget::LoadDir(QString dir, QList<LFileInfo> list){
     }else{
       for(int i=0; i<listWidget->count(); i++){
         if( !newfiles.contains(listWidget->item(i)->text()) ){
+	  if(!updateThumbs){ needThumbs.removeAll( listWidget->item(i)->whatsThis().section("::::",1,50)); }
 	  delete listWidget->takeItem(i); 
 	  i--;
 	}
@@ -302,6 +305,11 @@ void DirWidget::LoadDir(QString dir, QList<LFileInfo> list){
   hasimages = hasmultimedia = false;
   int numdirs = 0;
   qint64 filebytes = 0;
+  //Setup the timer to see when we should process events
+  QTimer updatetime;
+    updatetime.setInterval(1000); //1 second updates
+    updatetime.setSingleShot(true);
+    updatetime.start();
   if(DEBUG){ qDebug() << "Start Loop over items:" << time.elapsed(); }
   for(int i=0; i<list.length(); i++){
     if(stopload){ ui->actionStopLoad->setVisible(false); return; } //stop right now
@@ -333,9 +341,8 @@ void DirWidget::LoadDir(QString dir, QList<LFileInfo> list){
 	    it->setStatusTip(t, list[i].fileName());
 	      //Since the icon/image is based on the filename - only update this for a new item
 	      // (This is the slowest part of the routine)
-	      if(list[i].isImage()){
+	      if(list[i].isImage()&& (addnew || updateThumbs)){
 	        if(showThumbs){ 
-		  //it->setIcon(t, QIcon( QPixmap(list[i].absoluteFilePath()).scaled(treeWidget->iconSize(),Qt::IgnoreAspectRatio, Qt::FastTransformation) ) ); 
 		  it->setIcon(t, LXDG::findIcon("fileview-preview","image-x-generic") );
 		  needThumbs << list[i].fileName();	
 		}else{ it->setIcon(t, LXDG::findIcon(list[i].iconfile(),"image-x-generic") ); }
@@ -402,16 +409,16 @@ void DirWidget::LoadDir(QString dir, QList<LFileInfo> list){
 	    it = new QListWidgetItem();
 	    addnew = true;
 	  }else{ it = items.first(); }
-	    it->setWhatsThis( QString(canmodify ? "cut": "copy")+"::::"+list[i].absoluteFilePath()); //used for drag and drop
-	    it->setText(list[i].fileName());
-	    it->setStatusTip(list[i].fileName());
+
+	  it->setWhatsThis( QString(canmodify ? "cut": "copy")+"::::"+list[i].absoluteFilePath()); //used for drag and drop
+	  it->setText(list[i].fileName());
+	  it->setStatusTip(list[i].fileName());
 	    //Since the icon/image is based on the filename - only update this for a new items (non-thumbnail)
 	    // (This is the slowest part of the routine)
-	    if(list[i].isImage()){
+	    if(list[i].isImage() && (addnew || updateThumbs) ){
 	      if(showThumbs){ 
 		it->setIcon(LXDG::findIcon("fileview-preview","image-x-generic") );
 		needThumbs << list[i].fileName();	
-		//it->setIcon(QIcon( QPixmap(list[i].absoluteFilePath()).scaled(listWidget->iconSize(),Qt::IgnoreAspectRatio, Qt::FastTransformation) ) );
 	      }else{ it->setIcon(LXDG::findIcon(list[i].iconfile(),"image-x-generic") ); }
 	    }else if(addnew){
 	      it->setIcon(LXDG::findIcon(list[i].iconfile(),"unknown") );
@@ -423,7 +430,7 @@ void DirWidget::LoadDir(QString dir, QList<LFileInfo> list){
 	  listWidget->scrollToItem(it);
 	}
     }
-    if(i%15==0){ QApplication::processEvents(); }//keep the UI snappy while loading a directory
+    if(!updatetime.isActive()){ QApplication::processEvents(); updatetime.start(); }//keep the UI snappy while loading a directory
     if(DEBUG){ qDebug() << " - item finished:" << i << time.elapsed(); }
   }
   tmpSel.clear();
@@ -474,7 +481,7 @@ void DirWidget::LoadSnaps(QString basedir, QStringList snaps){
   //Save these value internally for use later
   snapbasedir = basedir;
   snapshots = snaps;
-  watcher->addPath(snapbasedir); //add this to the watcher in case snapshots get created/removed
+  if(!snapbasedir.isEmpty()){ watcher->addPath(snapbasedir); } //add this to the watcher in case snapshots get created/removed
   //Now update the UI as necessary
   
   ui->slider_snap->setRange(0, snaps.length());
@@ -596,6 +603,10 @@ void DirWidget::startLoadThumbs(){
   //This just runs through the dir and loads all the thumbnails as needed
   if(needThumbs.isEmpty()){ return; }
   needThumbs.removeDuplicates(); //just in case
+  QTimer updatetime;
+    updatetime.setInterval(1000); //1 second updates
+    updatetime.setSingleShot(true);
+    updatetime.start();
   for(int i=0; i<needThumbs.length() && !stopload; i++){
     if(showDetails){
       //Use the tree widget
@@ -606,7 +617,7 @@ void DirWidget::startLoadThumbs(){
       QListWidgetItem *it = listWidget->findItems(needThumbs[i], Qt::MatchExactly).first();
       it->setIcon(QIcon( QPixmap(it->whatsThis().section("::::",1,100)).scaled(listWidget->iconSize(),Qt::IgnoreAspectRatio, Qt::FastTransformation) ) );
     }
-    if(i%3==0){ QApplication::processEvents(); } // do 3 at a time
+    if(!updatetime.isActive()){ QApplication::processEvents(); updatetime.start(); } //it has been a second - process events
   }
 }