Optimized QML related to shift state handling

Remove unnecessary QML bindings to optimize performance.

Task-number: QTBUG-57082
Change-Id: Ibda52c5ddcc564a7b92dbd7831afd885c344718d
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>

src/virtualkeyboard/content/components/AlternativeKeys.qml

@@ -36,7 +36,6 @@ Item {
     property alias listView: listView
     property int keyCode
     property point origin
-    property bool uppercased: keyboard.uppercased
     signal clicked
 
     z: 1
@@ -86,7 +85,7 @@ Item {
         if (active && listView.currentIndex >= 0 && listView.currentIndex < listView.model.count) {
             var activeKey = listView.model.get(listView.currentIndex)
             InputContext.inputEngine.virtualKeyClick(keyCode, activeKey.text,
-                                                     uppercased ? Qt.ShiftModifier : 0)
+                                                     InputContext.shift ? Qt.ShiftModifier : 0)
         }
     }
 
@@ -95,7 +94,7 @@ Item {
         var alternativeKeys = key.effectiveAlternativeKeys
         if (alternativeKeys.length > 0) {
             for (var i = 0; i < alternativeKeys.length; i++) {
-                listModel.append({ "text": uppercased ? alternativeKeys[i].toUpperCase() : alternativeKeys[i] })
+                listModel.append({ "text": InputContext.shift ? alternativeKeys[i].toUpperCase() : alternativeKeys[i] })
             }
             listView.width = keyboard.style.alternateKeysListItemWidth * listModel.count
             listView.forceLayout()

src/virtualkeyboard/content/components/BaseKey.qml

@@ -29,6 +29,7 @@
 
 import QtQuick 2.0
 import QtQuick.Layouts 1.0
+import QtQuick.VirtualKeyboard 2.1
 
 /*!
     \qmltype BaseKey
@@ -203,7 +204,7 @@ Item {
 
         By default, this property reflects the uppercase status of the keyboard.
     */
-    property bool uppercased: keyboard.uppercased && !noModifier
+    property bool uppercased: InputContext.shift && !noModifier
 
     /*! Sets the key panel delegate for the key.
 

src/virtualkeyboard/content/components/CharacterPreviewBubble.qml

@@ -28,6 +28,7 @@
 ****************************************************************************/
 
 import QtQuick 2.0
+import QtQuick.VirtualKeyboard 2.1
 
 Item {
     property bool active
@@ -44,7 +45,7 @@ Item {
 
     onActiveKeyChanged: {
         if (activeKey && characterPreview.item !== null) {
-            characterPreview.item.text = keyboard.uppercased ? activeKey.text.toUpperCase() : activeKey.text
+            characterPreview.item.text = InputContext.shift ? activeKey.text.toUpperCase() : activeKey.text
             width = activeKey.width
             height = activeKey.height
             var position = keyboard.mapFromItem(activeKey, 0, 0)

src/virtualkeyboard/content/components/Keyboard.qml

@@ -59,7 +59,6 @@ Item {
         return "main"
     }
     property bool active: Qt.inputMethod.visible
-    property bool uppercased: InputContext.shift
     property bool handwritingMode
     property bool fullScreenHandwritingMode
     property bool symbolMode
@@ -635,7 +634,7 @@ Item {
                     function click(key) {
                         if (key && key.enabled) {
                             if (!key.noKeyEvent)
-                                InputContext.inputEngine.virtualKeyClick(key.key, keyboard.uppercased ? key.text.toUpperCase() : key.text, keyboard.uppercased ? Qt.ShiftModifier : 0)
+                                InputContext.inputEngine.virtualKeyClick(key.key, InputContext.shift ? key.text.toUpperCase() : key.text, InputContext.shift ? Qt.ShiftModifier : 0)
                             key.clicked()
                         }
                     }