1 files changed, 98 insertions, 0 deletions
diff --git a/cervisia/updateview_visitors.cpp b/cervisia/updateview_visitors.cpp
new file mode 100644
index 00000000..e18b5b68
--- /dev/null
+++ b/cervisia/updateview_visitors.cpp
@@ -0,0 +1,98 @@
+/*
+ * Copyright (c) 2003-2007 André Wöbbeking <Woebbeking@kde.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+
+#include "updateview_visitors.h"
+
+#include "updateview.h"
+#include "updateview_items.h"
+
+
+using Cervisia::Entry;
+
+
+ApplyFilterVisitor::ApplyFilterVisitor(UpdateView::Filter filter)
+    : m_filter(filter)
+{
+}
+
+
+void ApplyFilterVisitor::preVisit(UpdateDirItem* item)
+{
+    // as QListViewItem::setVisible() is recursive we have to make
+    // this UpdateDirItem visible first and later we can make it invisible
+    item->setVisible(true);
+
+    // assume that this item is invisible and correct it later
+    // (see markAllParentsAsVisible())
+    m_invisibleDirItems.insert(item);
+}
+
+
+void ApplyFilterVisitor::postVisit(UpdateDirItem* item)
+{
+    // a UpdateDirItem is visible if
+    // - it has visible children
+    // - it is not opened
+    // - empty directories are not hidden
+    // - it has no parent (top level item)
+    const bool visible(!m_invisibleDirItems.count(item)
+                       || !item->wasScanned()
+                       || !(m_filter & UpdateView::NoEmptyDirectories)
+                       || !item->parent());
+
+    // only set invisible as QListViewItem::setVisible() is recursive
+    // and so maybe overrides the state applied by the filter
+    if (visible)
+    {
+        markAllParentsAsVisible(item);
+    }
+    else
+    {
+        item->setVisible(false);
+    }
+}
+
+
+void ApplyFilterVisitor::visit(UpdateFileItem* item)
+{
+    const bool visible(item->applyFilter(m_filter));
+    if (visible)
+    {
+        markAllParentsAsVisible(item);
+    }
+}
+
+
+void ApplyFilterVisitor::markAllParentsAsVisible(UpdateItem* item)
+{
+    while ((item = static_cast<UpdateDirItem*>(item->parent())))
+    {
+        TItemSet::iterator it = m_invisibleDirItems.find(item);
+        if (it != m_invisibleDirItems.end())
+        {
+            m_invisibleDirItems.erase(it);
+        }
+        else
+        {
+            // if this item isn't in the map anymore all parents
+            // are already removed too
+            break;
+        }
+    }
+}