From 4e82b359897def33c90cd5465cda3ed10b5aa01a Mon Sep 17 00:00:00 2001
From: Peter Penz <peter.penz19@gmail.com>
Date: Thu, 11 Dec 2008 07:15:59 +0000
Subject: [PATCH] assure that the current index stays visible, when the user
 explicitly changed it by using the arrow keys

BUG: 165531

svn path=/trunk/KDE/kdebase/apps/; revision=895599
---
 src/dolphinviewautoscroller.cpp | 17 ++++++++++++++++-
 src/dolphinviewautoscroller.h   |  1 +
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/src/dolphinviewautoscroller.cpp b/src/dolphinviewautoscroller.cpp
index 5e9e17f1f..67bc696cc 100644
--- a/src/dolphinviewautoscroller.cpp
+++ b/src/dolphinviewautoscroller.cpp
@@ -36,6 +36,7 @@ DolphinViewAutoScroller::DolphinViewAutoScroller(QAbstractItemView* parent) :
 {
     m_itemView->setAutoScroll(false);
     m_itemView->viewport()->installEventFilter(this);
+    m_itemView->installEventFilter(this);
     
     m_timer = new QTimer(this);
     m_timer->setSingleShot(false);
@@ -83,7 +84,15 @@ bool DolphinViewAutoScroller::eventFilter(QObject* watched, QEvent* event)
         default:
             break;
         }
-    }
+    } else if ((watched == m_itemView) && (event->type() == QEvent::KeyPress)) {
+        const int key = static_cast<QKeyEvent*>(event)->key();
+        const bool arrowKeyPressed = (key == Qt::Key_Up)   || (key == Qt::Key_Down) ||
+                                     (key == Qt::Key_Left) || (key == Qt::Key_Right);
+        if (arrowKeyPressed) {
+            QMetaObject::invokeMethod(this, "scrollToCurrentIndex", Qt::QueuedConnection);
+        }
+    } 
+    
 
     return QObject::eventFilter(watched, event);
 }
@@ -114,6 +123,12 @@ void DolphinViewAutoScroller::scrollViewport()
     }
 }
 
+void DolphinViewAutoScroller::scrollToCurrentIndex()
+{
+     const QModelIndex index = m_itemView->currentIndex();
+     m_itemView->scrollTo(index);
+}
+
 void DolphinViewAutoScroller::triggerAutoScroll()
 {
     const bool verticalScrolling = (m_itemView->verticalScrollBar() != 0) &&
diff --git a/src/dolphinviewautoscroller.h b/src/dolphinviewautoscroller.h
index c04e22e28..177c6ee0f 100644
--- a/src/dolphinviewautoscroller.h
+++ b/src/dolphinviewautoscroller.h
@@ -44,6 +44,7 @@ protected:
 
 private slots:
     void scrollViewport();
+    void scrollToCurrentIndex();
     
 private:
     void triggerAutoScroll();
-- 
2.47.3