went through and checked methods that take or return pointers or indexes and added safety precautions against bad parameters

svn path=/trunk/KDE/kdebase/workspace/libs/plasma/; revision=744630

layouts/boxlayout.cpp

@@ -313,6 +313,10 @@ void BoxLayout::insertItem(int index, LayoutItem *item)
 
 void BoxLayout::addItem(LayoutItem *item)
 {
+    if (!item) {
+        return;
+    }
+
     insertItem(-1, item);
 }
 
@@ -325,8 +329,9 @@ void BoxLayout::removeItem(LayoutItem *item)
     item->unsetManagingLayout(this);
     d->children.removeAll(item);
 
-    if ( animator() )
-        animator()->setCurrentState(item,LayoutAnimator::RemovedState);
+    if (animator()) {
+        animator()->setCurrentState(item, LayoutAnimator::RemovedState);
+    }
 
     updateGeometry();
 }
@@ -338,13 +343,20 @@ int BoxLayout::indexOf(LayoutItem *l) const
 
 LayoutItem *BoxLayout::itemAt(int i) const
 {
+    if (i >= d->children.count()) {
+        return 0;
+    }
+
     return d->children[i];
 }
 
 LayoutItem *BoxLayout::takeAt(int i)
 {
-    return d->children.takeAt(i);
+    if (i >= d->children.count()) {
+        return 0;
+    }
 
+    return d->children.takeAt(i);
     updateGeometry();
 }
 

layouts/flowlayout.cpp

@@ -57,7 +57,7 @@ int FlowLayout::count() const
 
 void FlowLayout::addItem(LayoutItem* item)
 {
-    if (d->items.contains(item)) {
+    if (!item || d->items.contains(item)) {
         return;
     }
 
@@ -71,6 +71,10 @@ void FlowLayout::addItem(LayoutItem* item)
 }
 void FlowLayout::removeItem(LayoutItem* item)
 {
+    if (!item) {
+        return;
+    }
+
     item->unsetManagingLayout(this);
     d->items.removeAll(item);
 
@@ -80,12 +84,21 @@ void FlowLayout::removeItem(LayoutItem* item)
 }
 int FlowLayout::indexOf(LayoutItem* item) const
 {
+    if (!item) {
+        return -1;
+    }
+
     return d->items.indexOf(item);
 }
 LayoutItem* FlowLayout::itemAt(int i) const
 {
+    if (i >= d->items.count()) {
+        return 0;
+    }
+
     return d->items[i];
 }
+
 QSizeF FlowLayout::sizeHint() const
 {
     // TODO A proper algorithm here
@@ -98,8 +111,13 @@ QSizeF FlowLayout::sizeHint() const
     // testing
     return QSizeF(500,500);
 }
+
 LayoutItem* FlowLayout::takeAt(int i)
 {
+    if (i >= d->items.count()) {
+        return 0;
+    }
+
     return d->items.takeAt(i);
 }
 
@@ -123,7 +141,7 @@ void FlowLayout::relayout()
     qreal totalWidth = 0;
     qreal totalHeight = 0;
 
-    foreach( LayoutItem *item , d->items ) {
+    foreach(LayoutItem *item , d->items) {
         totalWidth += item->sizeHint().width();
         totalHeight += item->sizeHint().height();
     }
@@ -146,8 +164,7 @@ void FlowLayout::relayout()
     qreal rowHeight = 0;
 
     // lay the items out in left-to-right , top-to-bottom order
-    foreach( LayoutItem *item , d->items ) {
-    
+    foreach(LayoutItem *item , d->items) {
         const QSizeF& itemSize = item->sizeHint();
 
         int columnSpan = (int)ceil(itemSize.width() / averageWidth);

layouts/nodelayout.cpp

@@ -174,12 +174,12 @@ QSizeF NodeLayout::sizeHint() const
     return d->sizeHint;
 }
 
-void NodeLayout::addItem (LayoutItem * item)
+void NodeLayout::addItem(LayoutItem * item)
 {
-    NodeLayout::addItem (item, NodeCoordinate());
+    NodeLayout::addItem(item, NodeCoordinate());
 }
 
-void NodeLayout::addItem (LayoutItem * item, NodeCoordinate topLeft, NodeCoordinate bottomRight)
+void NodeLayout::addItem(LayoutItem * item, NodeCoordinate topLeft, NodeCoordinate bottomRight)
 {
     if (!item) {
         return;
@@ -190,7 +190,7 @@ void NodeLayout::addItem (LayoutItem * item, NodeCoordinate topLeft, NodeCoordin
     d->calculateSizeHint(item);
 }
 
-void NodeLayout::addItem (LayoutItem * item, NodeCoordinate node, qreal xr, qreal yr)
+void NodeLayout::addItem(LayoutItem * item, NodeCoordinate node, qreal xr, qreal yr)
 {
     if (!item) {
         return;
@@ -202,7 +202,7 @@ void NodeLayout::addItem (LayoutItem * item, NodeCoordinate node, qreal xr, qrea
     d->calculateSizeHint(item);
 }
 
-void NodeLayout::removeItem (LayoutItem * item)
+void NodeLayout::removeItem(LayoutItem * item)
 {
     if (!item) {
         return;
@@ -220,17 +220,28 @@ int NodeLayout::count() const
 
 int NodeLayout::indexOf(LayoutItem * item) const
 {
-    if (!item) return -1;
+    if (!item) {
+        return -1;
+    }
+
     return d->items.keys().indexOf(item);
 }
 
 LayoutItem * NodeLayout::itemAt(int i) const
 {
+    if (i >= d->items.count()) {
+        return 0;
+    }
+
     return d->items.keys()[i];
 }
 
 LayoutItem * NodeLayout::takeAt(int i)
 {
+    if (i >= d->items.count()) {
+        return 0;
+    }
+
     LayoutItem * item = itemAt(i);
     removeItem(item);
     return item;