Improve cache handling in KItemListWidget

Provide a hook for derived KItemListWidget where the cache
can be updated.

1 files changed, 13 insertions, 1 deletions

diff --git a/src/kitemviews/kfileitemlistwidget.h b/src/kitemviews/kfileitemlistwidget.h
index a16e75a8e..50e746fad 100644
--- a/src/kitemviews/kfileitemlistwidget.h
+++ b/src/kitemviews/kfileitemlistwidget.h
@@ -53,6 +53,18 @@ public:
     virtual QRectF expansionToggleRect() const;
 
 protected:
+    /**
+     * Invalidates the cache which results in calling KFileItemListWidget::refreshCache() as
+     * soon as the item need to gets repainted.
+     */
+    void invalidateCache();
+
+    /**
+     * Is called if the cache got invalidated by KFileItemListWidget::invalidateCache().
+     * The default implementation is empty.
+     */
+    virtual void refreshCache();
+
     void setTextColor(const QColor& color);
     QColor textColor() const;
 
@@ -80,7 +92,7 @@ private:
         TextIdCount // Mandatory last entry
     };
 
-    void updateCache();
+    void triggerCacheRefreshing();
     void updateExpansionArea();
     void updatePixmapCache();