Shared: Added maximum offset changed signal

Signed-off-by: Adriano Rezende <adriano.rezende@openbossa.org>

2 files changed, 28 insertions, 8 deletions

diff --git a/shared/listview.cpp b/shared/listview.cpp
index feac60d..ae109ac 100644
--- a/shared/listview.cpp
+++ b/shared/listview.cpp
@@ -172,6 +172,8 @@ public:
     void repositionRenderers();
     bool setPixelPosition(int value);
     int visibleItemCount();
+    void setMaximumOffset(int value);
+    void updateMaximumOffset();
 
     int totalCount() const { return !model ? 0 : model->count(); }
 
@@ -179,6 +181,7 @@ public:
     int currentItem;
 
     int offset;
+    int maximumOffset;
     int spareRenderers;
 
     AbstractModel *model;
@@ -193,6 +196,7 @@ private:
 ListViewPrivate::ListViewPrivate(ListView *qptr)
     : itemSpace(50),
       currentItem(0),
+      maximumOffset(0),
       spareRenderers(2),
       model(0),
       creator(0),
@@ -349,6 +353,23 @@ int ListViewPrivate::visibleItemCount()
         return qMax(r - spareRenderers, 0);
 }
 
+void ListViewPrivate::setMaximumOffset(int value)
+{
+    value = qMax(value, 0);
+    if (maximumOffset != value) {
+        maximumOffset = value;
+        emit q->maximumOffsetChanged();
+    }
+}
+
+void ListViewPrivate::updateMaximumOffset()
+{
+    if (totalCount() == 0)
+        setMaximumOffset(0);
+    else
+        setMaximumOffset(qRound(totalCount() * itemSpace - q->size().height()));
+}
+
 
 
 ListView::ListView(QGraphicsItem *parent)
@@ -424,6 +445,7 @@ void ListView::setCreator(AbstractListViewCreator *creator)
         if (item) {
             d->itemSpace = item->preferredSize().height();
             delete item;
+            d->updateMaximumOffset();
         }
     }
 }
@@ -438,25 +460,19 @@ void ListView::setOffset(int position)
     int oldOffset = offset();
     d->setPixelPosition(qBound(0, position, maximumOffset()));
 
-    // XXX: must emit also when maximum offset has changed
     if (oldOffset != offset())
         emit offsetChanged();
 }
 
 int ListView::maximumOffset() const
 {
-    if (d->totalCount() == 0)
-        return 0;
-
-    const int total = d->totalCount() * d->itemSpace;
-    const int space = size().height();
-
-    return qMax(qRound(total - space), 0);
+    return d->maximumOffset;
 }
 
 void ListView::resizeEvent(QGraphicsSceneResizeEvent *event)
 {
     QGraphicsWidget::resizeEvent(event);
+    d->updateMaximumOffset();
     d->reconfigureRenderers();
 }
 
@@ -492,6 +508,7 @@ ListViewItem *ListView::itemFromIndex(int index)
 void ListView::modelChanged()
 {
     d->currentItem = 0;
+    d->updateMaximumOffset();
     setOffset(0);
     reconfigureRenderers();
 }
@@ -508,6 +525,7 @@ void ListView::itemAdded(int index)
 {
     Q_UNUSED(index);
     // XXX: optimize (check if it's in visible area)
+    d->updateMaximumOffset();
     reconfigureRenderers();
 }
 
@@ -515,6 +533,7 @@ void ListView::itemRemoved(int index)
 {
     Q_UNUSED(index);
     // XXX: optimize (check if it's in visible area)
+    d->updateMaximumOffset();
     reconfigureRenderers();
 }
 
diff --git a/shared/listview.h b/shared/listview.h
index 594f866..374fda6 100644
--- a/shared/listview.h
+++ b/shared/listview.h
@@ -111,6 +111,7 @@ public:
 
 signals:
     void offsetChanged();
+    void maximumOffsetChanged();
     void itemClicked(int index);
 
 public slots: