Fix runtime support under Qt4

runtime/TabWindow.cpp

@@ -25,6 +25,9 @@ DockTabWidget *DockTabWidget::mainTabWidget = NULL;
 DockTabWidget::DockTabWidget(QWidget *parent) :
     QTabWidget(parent)
 {
+    floatingWidget = NULL;
+    floatingEnabled = false;
+
     setParent(parent);
     setTabsClosable(false);
     setElideMode(Qt::ElideRight);
@@ -512,6 +515,7 @@ DockTabBar::DockTabBar(DockTabWidget *tabWidget, QWidget *parent) :
     QTabBar(parent),
     tab_widget(tabWidget)
 {
+    isStartingDrag = false;
     setAcceptDrops(true);
 }
 

runtime/TabWindow.h

@@ -90,8 +90,8 @@ public slots:
     void tabIndexChanged(int index);
 
 private:
-    QWidget *floatingWidget = 0;
-    bool floatingEnabled = false;
+    QWidget *floatingWidget;
+    bool floatingEnabled;
 };
 
 class DockTabBar : public QTabBar
@@ -115,6 +115,7 @@ protected:
     void dropEvent(QDropEvent *event);
     void dragLeaveEvent(QDragLeaveEvent * event);
 
+    // re-implemented paint event to draw the text on tab bar of tab widget control.
     void paintEvent(QPaintEvent *event)
     {
         Q_UNUSED(event);
@@ -144,20 +145,21 @@ protected:
                 QRect rect(option.rect);
 
                 // If toolButton is visible then only draw text after tool button pixel area.
+                // If tool button is not visible - draw the text after margin of 10px.
                 if (isToolBtnVisible)
                 {
                     if ((current_index != -1) && i == current_index)
                     {
                         if (str.startsWith("Query -") || str.startsWith("Debugger"))
-                            rect.setX(option.rect.x() + 5);
+                            rect.setX(option.rect.x() + 10);
                         else
                             rect.setX(option.rect.x() + 45);
                     }
                     else
-                        rect.setX(option.rect.x() + 5);
+                        rect.setX(option.rect.x() + 10);
                 }
                 else
-                    rect.setX(option.rect.x() + 5);
+                    rect.setX(option.rect.x() + 10);
 
                 rect.setY(option.rect.y() + 7);
 
@@ -178,8 +180,8 @@ protected:
 
 private:
     int insertionIndexAt(const QPoint &pos);
-    DockTabWidget *tab_widget = 0;
-    bool isStartingDrag = false;
+    DockTabWidget *tab_widget;
+    bool isStartingDrag;
     QPoint dragStartPos;
 };
 

runtime/pgAdmin4.cpp

@@ -183,8 +183,10 @@ int main(int argc, char * argv[])
     QCoreApplication::setOrganizationDomain("pgadmin.org");
     QCoreApplication::setApplicationName(PGA_APP_NAME.toLower().replace(" ", ""));
 
+#if QT_VERSION >= 0x050000
     // Set high DPI pixmap to display icons clear on Qt widget.
     QApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
+#endif
 
     /* In windows and linux, it is required to set application level proxy
      * becuase socket bind logic to find free port gives socket creation error