--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ginebra2/ObjectCharm.cpp	Wed Jun 23 17:59:43 2010 +0300
@@ -0,0 +1,180 @@
+
+#include <QtGui>
+#include <QObject>
+#include <QDebug>
+#include <QApplication>
+#include <QTimer>
+
+#include "ObjectCharm.h"
+
+namespace GVA {
+
+// ----------------------------
+// ObjectCharm
+// ----------------------------
+
+ObjectCharm::ObjectCharm(QObject *object)
+  : m_object(object)
+{
+    m_object->installEventFilter(this);
+    connect(m_object, SIGNAL(destroyed()), this, SLOT(onObjectDestroyed()));
+}
+
+void ObjectCharm::onObjectDestroyed() {
+    deleteLater();
+}
+
+// ----------------------------
+// ExternalEventCharm
+// ----------------------------
+
+inline QGraphicsScene *ExternalEventCharm::scene() {
+    QGraphicsObject *item = static_cast<QGraphicsObject*>(m_object);
+    return item->scene();
+}
+
+ExternalEventCharm::ExternalEventCharm(QGraphicsObject *object)
+  : ObjectCharm(object)
+{
+}
+
+bool ExternalEventCharm::eventFilter(QObject *object, QEvent *event) {
+    //qDebug() << "ExternalEventCharm::eventFilter: " << object << event;
+    // Check for external events grabbed by this item.
+
+    checkForExternalEvent(this, event);
+
+    switch (event->type()) {
+      case QEvent::Show:
+      {
+          scene()->installEventFilter(this);
+          break;
+      }
+      case QEvent::Hide:
+      {
+          scene()->removeEventFilter(this);
+          break;
+      }
+      default: break;
+    }
+
+    // standard event processing
+    return object->eventFilter(object, event);
+}
+
+void ExternalEventCharm::checkForExternalEvent(QObject * o, QEvent * e)
+{
+    Q_UNUSED(o);
+
+    // Ignore all but a few mouse press events.
+
+    switch (e->type()) {
+    case QEvent::GraphicsSceneMousePress:
+    case QEvent::GraphicsSceneMouseRelease:
+    case QEvent::GraphicsSceneMouseDoubleClick:
+        break;
+    default:
+        return;
+    }
+
+    QGraphicsSceneMouseEvent * me = static_cast<QGraphicsSceneMouseEvent*>(e);
+
+    QPointF eventPosition = me->scenePos();
+
+    QGraphicsObject *item = static_cast<QGraphicsObject*>(m_object);
+
+    QRectF itemGeometry = item->sceneBoundingRect();
+
+    if (!itemGeometry.contains(eventPosition)) {
+        emitExternalEvent(e);
+    }
+}
+
+void ExternalEventCharm::emitExternalEvent(QEvent * e)
+{
+    QString description;
+
+    QDebug stream(&description);
+    stream << e;
+
+    QString name = description;
+    name.truncate(name.indexOf('('));
+
+    emit externalMouseEvent(e->type(), name, description.trimmed());
+}
+
+// ----------------------------
+// TouchCircleCharm
+// ----------------------------
+
+TouchCircleCharm::TouchCircleCharm(QObject *object, QGraphicsItem *parent)
+    : ObjectCharm(object),
+      m_timer(new QTimer())
+{
+    m_item = new QGraphicsEllipseItem(QRect(0,0,20,20), parent);
+    m_item->hide();
+    m_item->setPen(QPen(QColor(Qt::black)));
+    m_item->setBrush(QBrush(QColor(200, 0, 0)));
+    m_item->setZValue(100);  // make sure it isn't obscured
+
+    m_timer->setSingleShot(true);
+    connect(m_timer, SIGNAL(timeout()), this, SLOT(onTimer()));
+}
+
+TouchCircleCharm::~TouchCircleCharm() {
+    delete m_item;
+    delete m_timer;
+}
+
+bool TouchCircleCharm::eventFilter(QObject *object, QEvent *event) {
+    switch (event->type()) {
+        case QEvent::GraphicsSceneMousePress: {
+            // Show the item.
+            QGraphicsSceneMouseEvent * me = static_cast<QGraphicsSceneMouseEvent*>(event);
+            m_item->setPos(me->scenePos().x() - m_item->rect().width()/2,
+                           me->scenePos().y() - m_item->rect().height()/2);
+
+            // Change the color to indicate click.
+            m_item->setBrush(QBrush(QColor(0, 0, 200)));
+
+            m_item->show();
+            m_timer->stop();
+            break;
+        }
+        case QEvent::GraphicsSceneMouseMove: {
+            if(m_item->isVisible()) {
+                // Move it to new position.
+                QGraphicsSceneMouseEvent * me = static_cast<QGraphicsSceneMouseEvent*>(event);
+                m_item->setPos(me->scenePos().x() - m_item->rect().width()/2,
+                               me->scenePos().y() - m_item->rect().height()/2);
+
+                // Change the color to indicate drag.
+                m_item->setBrush(QBrush(QColor(200, 0, 0)));
+            }
+            break;
+        }
+        case QEvent::GraphicsSceneMouseDoubleClick: {
+            if(m_item->isVisible()) {
+                // Change the color to indicate double click.
+                m_item->setBrush(QBrush(QColor(0, 200, 0)));
+
+                m_timer->stop();
+            }
+            break;
+        }
+        case QEvent::GraphicsSceneMouseRelease: {
+            if(m_item->isVisible()) {
+                // Start timer to hide it.
+                m_timer->start(2000);
+            }
+            break;
+        }
+    }
+    return object->eventFilter(object, event);
+}
+
+void TouchCircleCharm::onTimer() {   // slot
+    m_item->hide();
+}
+
+}   // namespace GVA