TableViewStyle: Fix and document styleData.hasActiveFocus property

The property has been present since 5.1 for rowDelegate and missing for
itemDelegate. Also, the property was incorrectly bound to the table
having active focus instead of the row.

Change-Id: I43a93975dffd849b37cfee6363343f8aef57d11b
Reviewed-by: J-P Nurmi <jpnurmi@theqtcompany.com>

src/controls/Styles/Base/TableViewStyle.qml

 /****************************************************************************
 **
-** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
 ** Contact: http://www.qt-project.org/legal
 **
 ** This file is part of the Qt Quick Controls module of the Qt Toolkit.
@@ -110,7 +110,7 @@ ScrollViewStyle {
     */
     property Component rowDelegate: Rectangle {
         height: Math.round(TextSingleton.implicitHeight * 1.2)
-        property color selectedColor: styleData.hasActiveFocus ? "#07c" : "#999"
+        property color selectedColor: control.activeFocus ? "#07c" : "#999"
         color: styleData.selected ? selectedColor :
                                     !styleData.alternate ? alternateBackgroundColor : backgroundColor
     }

src/controls/Styles/Desktop/TableViewStyle.qml

 /****************************************************************************
 **
-** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
 ** Contact: http://www.qt-project.org/legal
 **
 ** This file is part of the Qt Quick Controls module of the Qt Toolkit.
@@ -82,7 +82,7 @@ ScrollViewStyle {
         visible: styleData.selected || styleData.alternate
         source: "image://__tablerow/" + (styleData.alternate ? "alternate_" : "")
                 + (styleData.selected ? "selected_" : "")
-                + (styleData.hasActiveFocus ? "active" : "")
+                + (control.activeFocus ? "active" : "")
         height: Math.max(16, RowItemSingleton.implicitHeight)
         border.left: 4 ; border.right: 4
     }

src/controls/TableView.qml

 /****************************************************************************
 **
-** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
 ** Contact: http://www.qt-project.org/legal
 **
 ** This file is part of the Qt Quick Controls module of the Qt Toolkit.
@@ -149,6 +149,7 @@ ScrollView {
     \li  styleData.elideMode - the elide mode of the column
     \li  styleData.textAlignment - the horizontal text alignment of the column
     \li  styleData.pressed - true when the item is pressed (since QtQuick.Controls 1.3)
+    \li  styleData.hasActiveFocus - true when the row has focus (since QtQuick.Controls 1.3)
     \endlist
 
     Example:
@@ -179,6 +180,7 @@ ScrollView {
     \li  styleData.alternate - true when the row uses the alternate background color
     \li  styleData.selected - true when the row is currently selected
     \li  styleData.row - the index of the row
+    \li  styleData.hasActiveFocus - true when the row has focus
     \li  styleData.pressed - true when the row is pressed (since QtQuick.Controls 1.3)
     \endlist
 
@@ -761,7 +763,7 @@ ScrollView {
                     property QtObject styleData: QtObject {
                         readonly property bool alternate: (index + rowCount) % 2 === 1
                         readonly property bool selected: false
-                        readonly property bool hasActiveFocus: root.activeFocus
+                        readonly property bool hasActiveFocus: false
                         readonly property bool pressed: false
                     }
                     readonly property var model: listView.model
@@ -924,7 +926,7 @@ ScrollView {
                         readonly property int row: rowitem.rowIndex
                         readonly property bool alternate: rowitem.alternate
                         readonly property bool selected: rowitem.itemSelected
-                        readonly property bool hasActiveFocus: root.activeFocus
+                        readonly property bool hasActiveFocus: rowitem.activeFocus
                         readonly property bool pressed: rowitem.rowIndex === mousearea.pressedRow
                     }
                     readonly property var model: listView.model
@@ -955,6 +957,7 @@ ScrollView {
                                 readonly property int elideMode: columnItem.elideMode
                                 readonly property int textAlignment: columnItem.horizontalAlignment
                                 readonly property bool selected: rowitem.itemSelected
+                                readonly property bool hasActiveFocus: rowitem.activeFocus
                                 readonly property bool pressed: row === mousearea.pressedRow && column === mousearea.pressedColumn
                                 readonly property color textColor: rowitem.itemTextColor
                                 readonly property string role: columnItem.role