From 6ad3371e9aa9722da628d8cf272eadb87703d933 Mon Sep 17 00:00:00 2001
From: Marco Martin <notmart@gmail.com>
Date: Sat, 16 Oct 2010 17:41:59 +0000
Subject: [PATCH] scroll around while dragging items on the extender, to make
 possible drop the item on any point

svn path=/trunk/KDE/kdelibs/; revision=1186504
---
 extenders/extender.cpp      | 9 +++++++++
 extenders/extendergroup.cpp | 2 ++
 private/extender_p.h        | 1 +
 3 files changed, 12 insertions(+)

diff --git a/extenders/extender.cpp b/extenders/extender.cpp
index 22e4add1b..2b55141ab 100644
--- a/extenders/extender.cpp
+++ b/extenders/extender.cpp
@@ -421,6 +421,8 @@ void Extender::dragMoveEvent(QGraphicsSceneDragDropEvent *event)
 
         if (mimeData) {
             itemHoverMoveEvent(mimeData->extenderItem(), event->pos());
+
+            d->setPositionFromDragPosition(event->scenePos());
         }
     }
 }
@@ -837,6 +839,13 @@ void ExtenderPrivate::adjustMinimumSize()
     scrollWidget->setMinimumHeight(qMin((qreal)300, mainWidget->effectiveSizeHint(Qt::MinimumSize).height()));
 }
 
+void ExtenderPrivate::setPositionFromDragPosition(const QPointF &pos)
+{
+    const qreal ratio = (q->mapFromScene(pos).y()/scrollWidget->size().height());
+
+    mainWidget->setPos(mainWidget->pos().x(), 30 + (ratio *(scrollWidget->size().height() - mainWidget->size().height() - 30)));
+}
+
 ExtenderGroup *ExtenderPrivate::findGroup(const QString &name) const
 {
     foreach (ExtenderItem *item, attachedExtenderItems) {
diff --git a/extenders/extendergroup.cpp b/extenders/extendergroup.cpp
index 3a2618dea..40d646ab3 100644
--- a/extenders/extendergroup.cpp
+++ b/extenders/extendergroup.cpp
@@ -266,6 +266,8 @@ void ExtenderGroup::dragMoveEvent(QGraphicsSceneDragDropEvent *event)
                 d->spacerWidget = widget;
             }
             d->layout->insertItem(insertIndex, d->spacerWidget);
+
+            extender()->d->setPositionFromDragPosition(event->scenePos());
         }
     }
 }
diff --git a/private/extender_p.h b/private/extender_p.h
index 30866b969..85786bc51 100644
--- a/private/extender_p.h
+++ b/private/extender_p.h
@@ -75,6 +75,7 @@ class ExtenderPrivate
         void delayItemAddedEvent();
         void updateEmptyExtenderLabel();
         void adjustMinimumSize();
+        void setPositionFromDragPosition(const QPointF &pos);
         ExtenderGroup *findGroup(const QString &name) const;
 
         Extender *q;