QML Observer: Build together on runtime with debugging tools

Moved qmljsdebugger to a dir under qml/, made qmlobserver compile
without creator dependencies and made it compile with debugging
helpers.

Reviewed-by: hjk

share/qtcreator/qml/qmljsdebugger/editor/subcomponentmasklayeritem.cpp

@@ -0,0 +1,80 @@
+#include "subcomponentmasklayeritem.h"
+#include "qmlobserverconstants.h"
+#include "qdeclarativeviewobserver.h"
+#include <QPolygonF>
+
+namespace QmlJSDebugger {
+
+SubcomponentMaskLayerItem::SubcomponentMaskLayerItem(QDeclarativeViewObserver *observer, QGraphicsItem *parentItem) :
+    QGraphicsPolygonItem(parentItem),
+    m_observer(observer),
+    m_currentItem(0),
+    m_borderRect(new QGraphicsRectItem(this))
+{
+    m_borderRect->setRect(0,0,0,0);
+    m_borderRect->setPen(QPen(QColor(60, 60, 60), 1));
+    m_borderRect->setData(Constants::EditorItemDataKey, QVariant(true));
+
+    setBrush(QBrush(QColor(160,160,160)));
+    setPen(Qt::NoPen);
+}
+
+int SubcomponentMaskLayerItem::type() const
+{
+    return Constants::EditorItemType;
+}
+
+static QRectF resizeRect(const QRectF &newRect, const QRectF &oldRect)
+{
+    QRectF result = newRect;
+    if (oldRect.left() < newRect.left())
+        result.setLeft(oldRect.left());
+
+    if (oldRect.top() < newRect.top())
+        result.setTop(oldRect.top());
+
+    if (oldRect.right() > newRect.right())
+        result.setRight(oldRect.right());
+
+    if (oldRect.bottom() > newRect.bottom())
+        result.setBottom(oldRect.bottom());
+
+    return result;
+}
+
+
+void SubcomponentMaskLayerItem::setCurrentItem(QGraphicsItem *item)
+{
+    QGraphicsItem *prevItem = m_currentItem;
+    m_currentItem = item;
+
+    if (!m_currentItem)
+        return;
+
+    QPolygonF viewPoly(QRectF(m_observer->declarativeView()->rect()));
+    viewPoly = m_observer->declarativeView()->mapToScene(viewPoly.toPolygon());
+
+    QRectF itemRect = item->boundingRect() | item->childrenBoundingRect();
+    QPolygonF itemPoly(itemRect);
+    itemPoly = item->mapToScene(itemPoly);
+
+    // if updating the same item as before, resize the rectangle only bigger, not smaller.
+    if (prevItem == item && prevItem != 0) {
+        m_itemPolyRect = resizeRect(itemPoly.boundingRect(), m_itemPolyRect);
+    } else {
+        m_itemPolyRect = itemPoly.boundingRect();
+    }
+    QRectF borderRect = m_itemPolyRect;
+    borderRect.adjust(-1, -1, 1, 1);
+    m_borderRect->setRect(borderRect);
+
+    itemPoly = viewPoly.subtracted(QPolygonF(m_itemPolyRect));
+    setPolygon(itemPoly);
+}
+
+QGraphicsItem *SubcomponentMaskLayerItem::currentItem() const
+{
+    return m_currentItem;
+}
+
+} // namespace QmlJSDebugger