Handle focus for clear and clearentry buttons (#896)

src/Calculator/Views/CalculatorProgrammerRadixOperators.xaml

@@ -475,6 +475,7 @@
                                        AutomationProperties.AutomationId="clearButton"
                                        ButtonId="Clear"
                                        Content="C"
+                                       LostFocus="ClearButton_LostFocus"
                                        Visibility="{x:Bind Model.IsInputEmpty, Mode=OneWay, Converter={StaticResource BooleanToVisibilityConverter}}"/>
 
             <controls:CalculatorButton x:Name="ClearEntryButton"
@@ -484,6 +485,7 @@
                                        AutomationProperties.AutomationId="clearEntryButton"
                                        ButtonId="ClearEntry"
                                        Content="CE"
+                                       LostFocus="ClearEntryButton_LostFocus"
                                        Visibility="{x:Bind Model.IsInputEmpty, Mode=OneWay, Converter={StaticResource BooleanToVisibilityNegationConverter}}"/>
 
             <controls:CalculatorButton x:Name="BackSpaceButton"

src/Calculator/Views/CalculatorProgrammerRadixOperators.xaml.cpp

@@ -52,7 +52,8 @@ void CalculatorProgrammerRadixOperators::BitshiftFlyout_Checked(Platform::Object
         FindName("RshLogicalButton");
     }
 
-    // Since arithmeticShiftButton defaults to IsChecked = true, this event an fire before we can load the deferred loaded controls. If that is the case, just return and do nothing.
+    // Since arithmeticShiftButton defaults to IsChecked = true, this event an fire before we can load the deferred loaded controls. If that is the case, just
+    // return and do nothing.
     if (RolButton == nullptr || RorButton == nullptr || RolCarryButton == nullptr || RorCarryButton == nullptr || LshLogicalButton == nullptr
         || RshLogicalButton == nullptr)
     {
@@ -61,7 +62,7 @@ void CalculatorProgrammerRadixOperators::BitshiftFlyout_Checked(Platform::Object
 
     CollapseBitshiftButtons();
 
-    auto radioButton = static_cast<RadioButton^>(sender);
+    auto radioButton = static_cast<RadioButton ^>(sender);
 
     if (radioButton == ArithmeticShiftButton)
     {
@@ -142,3 +143,19 @@ void CalculatorProgrammerRadixOperators::CalculatorProgrammerRadixOperators::Ope
 {
     Model->SetOpenParenthesisCountNarratorAnnouncement();
 }
+
+void CalculatorProgrammerRadixOperators::ClearEntryButton_LostFocus(Object ^ sender, RoutedEventArgs ^ e)
+{
+    if (ClearEntryButton->Visibility == ::Visibility::Collapsed && ClearButton->Visibility == ::Visibility::Visible)
+    {
+        ClearButton->Focus(::FocusState::Programmatic);
+    }
+}
+
+void CalculatorProgrammerRadixOperators::ClearButton_LostFocus(Object ^ sender, RoutedEventArgs ^ e)
+{
+    if (ClearEntryButton->Visibility == ::Visibility::Visible && ClearButton->Visibility == ::Visibility::Collapsed)
+    {
+        ClearEntryButton->Focus(::FocusState::Programmatic);
+    }
+}

src/Calculator/Views/CalculatorProgrammerRadixOperators.xaml.h

@@ -39,5 +39,7 @@ namespace CalculatorApp
 
         bool m_isErrorVisualState;
         void OpenParenthesisButton_GotFocus(Platform::Object ^ sender, Windows::UI::Xaml::RoutedEventArgs ^ e);
+        void ClearEntryButton_LostFocus(Platform::Object ^ sender, Windows::UI::Xaml::RoutedEventArgs ^ e);
+        void ClearButton_LostFocus(Platform::Object ^ sender, Windows::UI::Xaml::RoutedEventArgs ^ e);
     };
 }

src/Calculator/Views/CalculatorScientificOperators.xaml

@@ -898,7 +898,7 @@
                 <ColumnDefinition/>
                 <ColumnDefinition/>
             </Grid.ColumnDefinitions>
-            <controls:CalculatorButton Name="ClearEntryButton"
+            <controls:CalculatorButton x:Name="ClearEntryButton"
                                        x:Uid="clearEntryButton"
                                        Grid.Column="1"
                                        Style="{StaticResource OperatorButtonStyle}"
@@ -906,6 +906,7 @@
                                        AutomationProperties.AutomationId="clearEntryButton"
                                        ButtonId="ClearEntry"
                                        Content="CE"
+                                       LostFocus="ClearEntryButton_LostFocus"
                                        Visibility="{x:Bind Model.IsInputEmpty, Mode=OneWay, Converter={StaticResource BooleanToVisibilityNegationConverter}}"/>
 
             <controls:CalculatorButton x:Name="ClearButton"
@@ -916,6 +917,7 @@
                                        AutomationProperties.AutomationId="clearButton"
                                        ButtonId="Clear"
                                        Content="C"
+                                       LostFocus="ClearButton_LostFocus"
                                        Visibility="{x:Bind Model.IsInputEmpty, Mode=OneWay, Converter={StaticResource BooleanToVisibilityConverter}}"/>
 
             <controls:CalculatorButton x:Name="BackSpaceButton"

src/Calculator/Views/CalculatorScientificOperators.xaml.cpp

@@ -140,3 +140,19 @@ String ^ CalculatorScientificOperators::ParenthesisCountToString(unsigned int co
 {
     return (count == 0) ? ref new String() : ref new String(to_wstring(count).data());
 }
+
+void CalculatorScientificOperators::ClearEntryButton_LostFocus(Object ^ sender, RoutedEventArgs ^ e)
+{
+    if (ClearEntryButton->Visibility == ::Visibility::Collapsed && ClearButton->Visibility == ::Visibility::Visible)
+    {
+        ClearButton->Focus(::FocusState::Programmatic);
+    }
+}
+
+void CalculatorScientificOperators::ClearButton_LostFocus(Object ^ sender, RoutedEventArgs ^ e)
+{
+    if (ClearEntryButton->Visibility == ::Visibility::Visible && ClearButton->Visibility == ::Visibility::Collapsed)
+    {
+        ClearEntryButton->Focus(::FocusState::Programmatic);
+    }
+}

src/Calculator/Views/CalculatorScientificOperators.xaml.h

@@ -43,5 +43,7 @@ namespace CalculatorApp
         void ShiftButton_IsEnabledChanged(_In_ Platform::Object ^ sender, _In_ Windows::UI::Xaml::DependencyPropertyChangedEventArgs ^ e);
         void SetOperatorRowVisibility();
         void SetTrigRowVisibility();
+        void ClearEntryButton_LostFocus(Platform::Object ^ sender, Windows::UI::Xaml::RoutedEventArgs ^ e);
+        void ClearButton_LostFocus(Platform::Object ^ sender, Windows::UI::Xaml::RoutedEventArgs ^ e);
     };
 }