Introduce QGraphicsItem::ItemIsPanel, light-weight window.

ItemIsPanel allows items that act like windows. They can be
activated and deactivated just like windows and focus is handled
just like with windows. The main difference is that panels are
more light-weight. There's less built-in functionality (e.g.,
clicking a panel doesn't automatically activate nor raise it).

This patch also introduces QGraphicsItem::panel(),
QGraphicsItem::isPanel(), and QGraphicsItem::isActive(),
as well as QGraphicsScene::activePanel(),
QGraphicsScene::setActivePanel(). and QGraphicsScene::isActive().

Regular windows (QGraphicsWidgets with Qt::Window set) are
also panels, with added functionality. The ItemIsPanel flag is
set automatically for windows.

Reviewed-by: brad

1 files changed, 5 insertions, 1 deletions

diff --git a/src/gui/graphicsview/qgraphicsitem.h b/src/gui/graphicsview/qgraphicsitem.h
index 7af7c2f..b23941d 100644
--- a/src/gui/graphicsview/qgraphicsitem.h
+++ b/src/gui/graphicsview/qgraphicsitem.h
@@ -104,7 +104,8 @@ public:
         ItemSendsGeometryChanges = 0x800,
         ItemAcceptsInputMethod = 0x1000,
         ItemAutoDetectsFocusProxy = 0x2000,
-        ItemNegativeZStacksBehindParent = 0x4000
+        ItemNegativeZStacksBehindParent = 0x4000,
+        ItemIsPanel = 0x8000
         // NB! Don't forget to increase the d_ptr->flags bit field by 1 when adding a new flag.
     };
     Q_DECLARE_FLAGS(GraphicsItemFlags, GraphicsItemFlag)
@@ -161,11 +162,13 @@ public:
     QGraphicsWidget *parentWidget() const;
     QGraphicsWidget *topLevelWidget() const;
     QGraphicsWidget *window() const;
+    QGraphicsItem *panel() const;
     void setParentItem(QGraphicsItem *parent);
     QList<QGraphicsItem *> children() const; // ### obsolete
     QList<QGraphicsItem *> childItems() const;
     bool isWidget() const;
     bool isWindow() const;
+    bool isPanel() const;
 
     QGraphicsObject *toGraphicsObject();
     const QGraphicsObject *toGraphicsObject() const;
@@ -231,6 +234,7 @@ public:
     bool handlesChildEvents() const;
     void setHandlesChildEvents(bool enabled);
 
+    bool isActive() const;
     bool hasFocus() const;
     void setFocus(Qt::FocusReason focusReason = Qt::OtherFocusReason);
     void clearFocus();