Prototype of new SessionItemWidget with temporary unsubscription mechanism.

GUI/coregui/Views/CommonWidgets/SessionItemWidget.cpp

@@ -15,6 +15,7 @@
 // ************************************************************************** //
 
 #include "SessionItemWidget.h"
+#include "SessionItem.h"
 
 
 SessionItemWidget::SessionItemWidget(QWidget *parent)
@@ -27,3 +28,78 @@ QList<QAction *> SessionItemWidget::actionList()
 {
     return QList<QAction *>();
 }
+
+// --------------------------------------------------------------------------------------------- //
+
+#include <QDebug>
+
+NewSessionItemWidget::NewSessionItemWidget(QWidget* parent)
+    : QWidget(parent)
+    , m_currentItem(nullptr)
+    , is_subscribed(false)
+{
+
+}
+
+NewSessionItemWidget::~NewSessionItemWidget()
+{
+    unsubscribe();
+}
+
+void NewSessionItemWidget::setItem(SessionItem* item)
+{
+    qDebug() << "NewSessionItemWidget::setItem(SessionItem* item)" << item;
+
+    if(m_currentItem == item)
+        return;
+
+    unsubscribe(); // from previous item
+
+    m_currentItem = item;
+   if (!m_currentItem)
+       return;
+
+   subscribe();
+}
+
+QList<QAction*> NewSessionItemWidget::actionList()
+{
+    return QList<QAction *>();
+}
+
+void NewSessionItemWidget::showEvent(QShowEvent*)
+{
+    qDebug() << "NewSessionItemWidget::showEvent 1.1 was shown?";
+    subscribe();
+}
+
+void NewSessionItemWidget::hideEvent(QHideEvent*)
+{
+    qDebug() << "NewSessionItemWidget::hideEvent 1.1 was hidden?";
+    unsubscribe();
+}
+
+void NewSessionItemWidget::subscribe()
+{
+    qDebug() << "NewSessionItemWidget::subscribe()" << m_currentItem;
+
+    if (!m_currentItem || is_subscribed)
+        return;
+
+    m_currentItem->mapper()->setOnItemDestroy([this](SessionItem*) { m_currentItem = 0; }, this);
+
+    subscribeToItem();
+
+    is_subscribed = true;
+}
+
+void NewSessionItemWidget::unsubscribe()
+{
+    qDebug() << "NewSessionItemWidget::unsubscribe()" << m_currentItem;
+    if (m_currentItem)
+        m_currentItem->mapper()->unsubscribe(this);
+
+    unsubscribeFromItem();
+
+    is_subscribed = false;
+}

GUI/coregui/Views/CommonWidgets/SessionItemWidget.h

@@ -34,5 +34,39 @@ public:
 
 };
 
+class SessionItem;
+class QShowEvent;
+class QHideEvent;
+
+//! The NewSessionItemWidget class is a base for all widgets representing the content
+//! of SessionItem. It provides subscribe/unsibscribe mechanism on show/hide events.
+//! The main purpose is to save performance, when item keeps changing its properties, while
+//! widget is hidden.
+
+class BA_CORE_API_ NewSessionItemWidget : public QWidget
+{
+    Q_OBJECT
+public:
+    explicit NewSessionItemWidget(QWidget* parent = 0);
+    virtual ~NewSessionItemWidget();
+
+    virtual void setItem(SessionItem* item);
+    virtual QList<QAction*> actionList();
+
+    SessionItem* currentItem() { return m_currentItem; }
+
+protected:
+    virtual void subscribeToItem() {}
+    virtual void unsubscribeFromItem() {}
+    virtual void showEvent(QShowEvent*);
+    virtual void hideEvent(QHideEvent*);
+
+private:
+    void subscribe();
+    void unsubscribe();
+    SessionItem* m_currentItem;
+    bool is_subscribed;
+};
+
 #endif // SESSIONITEMWIDGET_H
 

GUI/coregui/Views/IntensityDataWidgets/IntensityDataWidget.cpp

@@ -24,11 +24,43 @@
 #include <QAction>
 #include <QBoxLayout>
 #include <QMenu>
+#include <QLabel>
+#include <QDebug>
+
+TestWidget::TestWidget(QWidget* parent) : NewSessionItemWidget(parent), m_label(new QLabel("XXX"))
+{
+    QHBoxLayout *hlayout = new QHBoxLayout;
+    hlayout->setMargin(0);
+    hlayout->setSpacing(0);
+
+    hlayout->addWidget(m_label);
+    setLayout(hlayout);
+}
+
+void TestWidget::subscribeToItem()
+{
+    Q_ASSERT(currentItem());
+
+    qDebug() << "TestWidget::subscribeToItem()" << currentItem()->modelType();
+    currentItem()->mapper()->setOnPropertyChange(
+                 [this](const QString &name)
+    {
+        qDebug() << "TestWidget::lambda()" << name;
+    }, this);
+
+    currentItem()->mapper()->setOnChildPropertyChange(
+                 [this](SessionItem* item, const QString &name)
+    {
+        qDebug() << "TestWidget::lambda() 2" << item->modelType() << name;
+    }, this);
+
+}
 
 IntensityDataWidget::IntensityDataWidget(QWidget *parent)
     : SessionItemWidget(parent)
     , m_intensityWidget(new IntensityDataCanvas)
     , m_propertyWidget(new IntensityDataPropertyWidget)
+    , m_testWidget(new TestWidget)
 {
     setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
 
@@ -38,6 +70,7 @@ IntensityDataWidget::IntensityDataWidget(QWidget *parent)
 
     hlayout->addWidget(m_intensityWidget);
     hlayout->addWidget(m_propertyWidget);
+    hlayout->addWidget(m_testWidget);
 
     QVBoxLayout *mainLayout = new QVBoxLayout;
     mainLayout->setMargin(0);
@@ -57,6 +90,7 @@ void IntensityDataWidget::setItem(SessionItem *item)
     IntensityDataItem *intensityData = jobItem->intensityDataItem();
     m_intensityWidget->setItem(intensityData);
     m_propertyWidget->setItem(intensityData);
+    m_testWidget->setItem(intensityData);
 }
 
 QList<QAction *> IntensityDataWidget::actionList()
@@ -71,4 +105,3 @@ void IntensityDataWidget::onContextMenuRequest(const QPoint& point)
         menu.addAction(action);
     menu.exec(point);
 }
-

GUI/coregui/Views/IntensityDataWidgets/IntensityDataWidget.h

@@ -19,11 +19,26 @@
 
 #include "SessionItemWidget.h"
 
+class TestWidget : public NewSessionItemWidget
+{
+    Q_OBJECT
+
+public:
+    TestWidget(QWidget* parent=0);
+
+protected:
+    virtual void subscribeToItem();
+
+private:
+    class QLabel *m_label;
+};
+
 class SessionItem;
 class IntensityDataCanvas;
 class IntensityDataPropertyWidget;
 class IntensityDataItem;
 class QAction;
+class TestWidget;
 
 //! A common widget to display color map (IntensityDataCanvas) and properties
 //! (IntensityDataPropertyWidget) of intensity data item.
@@ -45,7 +60,7 @@ private slots:
 private:
     IntensityDataCanvas* m_intensityWidget;
     IntensityDataPropertyWidget* m_propertyWidget;
-    IntensityDataItem* m_currentItem;
+    TestWidget* m_testWidget;
 };
 
 #endif // INTENSITYDATAWIDGET_H