add display mode changed signal

Change-Id: I5edc6fc2220b58d2ee0cb6c13f867bea43860084

frame/panel/mainpanel.cpp

@@ -58,6 +58,16 @@ void MainPanel::updateDockPosition(const Position dockPosition)
     m_itemAdjustTimer->start();
 }
 
+void MainPanel::updateDockDisplayMode(const DisplayMode displayMode)
+{
+    const QList<DockItem *> itemList = m_itemController->itemList();
+    for (auto item : itemList)
+    {
+        if (item->itemType() == DockItem::Placeholder)
+            item->setVisible(displayMode == Dock::Efficient);
+    }
+}
+
 void MainPanel::resizeEvent(QResizeEvent *e)
 {
     QWidget::resizeEvent(e);
@@ -192,13 +202,13 @@ void MainPanel::adjustItemSize()
     int base;
     if (m_position == Dock::Top || m_position == Dock::Bottom)
     {
-        qDebug() << "width: " << totalWidth << width();
+//        qDebug() << "width: " << totalWidth << width();
         overflow = totalWidth;
         base = width();
     }
     else
     {
-        qDebug() << "height: " << totalHeight << height();
+//        qDebug() << "height: " << totalHeight << height();
         overflow = totalHeight;
         base = height();
     }

frame/panel/mainpanel.h

@@ -16,6 +16,7 @@ public:
     explicit MainPanel(QWidget *parent = 0);
 
     void updateDockPosition(const Position dockPosition);
+    void updateDockDisplayMode(const Dock::DisplayMode displayMode);
 
 private:
     void resizeEvent(QResizeEvent *e);

frame/util/docksettings.cpp

@@ -91,6 +91,11 @@ DockSettings::DockSettings(QObject *parent)
     calculateWindowConfig();
 }
 
+DisplayMode DockSettings::displayMode() const
+{
+    return m_displayMode;
+}
+
 Position DockSettings::position() const
 {
     return m_position;

frame/util/docksettings.h

@@ -24,6 +24,7 @@ class DockSettings : public QObject
 public:
     explicit DockSettings(QObject *parent = 0);
 
+    DisplayMode displayMode() const;
     Position position() const;
     int screenHeight() const;
     const QRect primaryRect() const;

frame/window/mainwindow.cpp

@@ -83,6 +83,7 @@ void MainWindow::updateGeometry()
 {
     setFixedSize(m_settings->windowSize());
     m_mainPanel->updateDockPosition(m_settings->position());
+    m_mainPanel->updateDockDisplayMode(m_settings->displayMode());
 
     const QRect primaryRect = m_settings->primaryRect();
     const int offsetX = (primaryRect.width() - width()) / 2;