CaseKeyBox.xaml.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / Tools / System.Activities.Core.Presentation / System / Activities / Core / Presentation / CaseKeyBox.xaml.cs / 1305376 / CaseKeyBox.xaml.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------------------------

namespace System.Activities.Core.Presentation 
{
    using System; 
    using System.Activities.Presentation; 
    using System.Windows;
    using System.Windows.Controls; 
    using System.Windows.Data;
    using System.Windows.Input;
    using System.Windows.Threading;
 
    partial class CaseKeyBox : UserControl, ICaseKeyBoxView
    { 
        public static readonly DependencyProperty DisplayHintTextProperty = 
            DependencyProperty.Register("DisplayHintText", typeof(bool), typeof(CaseKeyBox));
 
        public static readonly DependencyProperty ValueProperty =
            DependencyProperty.Register("Value", typeof(object), typeof(CaseKeyBox), new PropertyMetadata(OnValueChanged));

        public static readonly DependencyProperty ValueTypeProperty = 
            DependencyProperty.Register("ValueType", typeof(Type), typeof(CaseKeyBox), new PropertyMetadata(OnValueTypeChanged));
 
        public static RoutedEvent ValueCommittedEvent = 
            EventManager.RegisterRoutedEvent("ValueCommitted", RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(CaseKeyBox));
 
        public static RoutedEvent EditCancelledEvent =
            EventManager.RegisterRoutedEvent("EditCancelled", RoutingStrategy.Bubble, typeof(RoutedEventHandler), typeof(CaseKeyBox));

        public static readonly DependencyProperty CaseKeyValidationCallbackProperty = 
            DependencyProperty.Register("CaseKeyValidationCallback", typeof(CaseKeyValidationCallbackDelegate), typeof(CaseKeyBox));
 
        public static readonly DependencyProperty ErrorCallbackProperty = 
            DependencyProperty.Register("ErrorCallback", typeof(Action), typeof(CaseKeyBox));
 
        public static readonly DependencyProperty CommitExplicitlyProperty =
            DependencyProperty.Register("CommitExplicitly", typeof(bool), typeof(CaseKeyBox), new PropertyMetadata(false));

        Control visibleBox; 

 
        public CaseKeyBox() 
        {
            this.ViewModel = new CaseKeyBoxViewModel(this); 
            InitializeComponent();
        }

        public event RoutedEventHandler ValueCommitted 
        {
            add { AddHandler(ValueCommittedEvent, value); } 
            remove { RemoveHandler(ValueCommittedEvent, value); } 
        }
 
        public virtual void OnValueCommitted()
        {
            RoutedEventArgs args = new RoutedEventArgs();
            args.RoutedEvent = ValueCommittedEvent; 
            RaiseEvent(args);
        } 
 
        public event RoutedEventHandler EditCancelled
        { 
            add { AddHandler(EditCancelledEvent, value); }
            remove { RemoveHandler(EditCancelledEvent, value); }
        }
 
        public virtual void OnEditCancelled()
        { 
            RoutedEventArgs args = new RoutedEventArgs(); 
            args.RoutedEvent = EditCancelledEvent;
            RaiseEvent(args); 
        }

        public CaseKeyValidationCallbackDelegate CaseKeyValidationCallback
        { 
            get { return (CaseKeyValidationCallbackDelegate)GetValue(CaseKeyValidationCallbackProperty); }
            set { SetValue(CaseKeyValidationCallbackProperty, value); } 
        } 

        public Action ErrorCallback 
        {
            get { return (Action)GetValue(ErrorCallbackProperty); }
            set { SetValue(ErrorCallbackProperty, value); }
        } 

        public bool CommitExplicitly 
        { 
            get { return (bool)GetValue(CommitExplicitlyProperty); }
            set { SetValue(CommitExplicitlyProperty, value); } 
        }

        void DisableKeyboardLostFocus()
        { 
            if (this.visibleBox != null)
            { 
                this.visibleBox.LostKeyboardFocus -= OnLostKeyboardFocus; 
            }
        } 

        void EnableKeyboardLostFocus()
        {
            if (!this.CommitExplicitly) 
            {
                if (this.visibleBox != null) 
                { 
                    this.visibleBox.LostKeyboardFocus += OnLostKeyboardFocus;
                } 
            }
        }

        void ReportError(string errorMessage) 
        {
            // Invoking error message box will cause LostFocus of the control. 
            // Thus we need to disable LostFocus first and then add the handlers back. 
            DisableKeyboardLostFocus();
            ErrorReporting.ShowErrorMessage(errorMessage); 

            this.Dispatcher.BeginInvoke(DispatcherPriority.ApplicationIdle, (Action)(() =>
            {
                if (this.ErrorCallback != null) 
                {
                    this.ErrorCallback(this); 
                    this.Dispatcher.BeginInvoke(DispatcherPriority.ApplicationIdle, (Action)(() => 
                    {
                        RegainFocus(); 
                        EnableKeyboardLostFocus();
                    }));
                }
                else 
                {
                    RegainFocus(); 
                    EnableKeyboardLostFocus(); 
                }
            })); 
        }

        void OnBoxMouseUp(object sender, MouseButtonEventArgs e)
        { 
            // disable the context menu for textbox and combobox
            if (e.ChangedButton == MouseButton.Right && e.RightButton == MouseButtonState.Released) 
            { 
                e.Handled = true;
            } 
        }

        #region ICaseKeyBoxView Implementation
 
        public bool DisplayHintText
        { 
            get { return (bool)GetValue(DisplayHintTextProperty); } 
            set { SetValue(DisplayHintTextProperty, value); }
        } 

        public object Value
        {
            get { return (object)GetValue(ValueProperty); } 
            set { SetValue(ValueProperty, value); }
        } 
 
        public Type ValueType
        { 
            get { return (Type)GetValue(ValueTypeProperty); }
            set { SetValue(ValueTypeProperty, value); }
        }
 
        public void RegainFocus()
        { 
            if (this.visibleBox != null) 
            {
                Keyboard.Focus((IInputElement)this.visibleBox); 
            }
        }

        #endregion 

        #region Delegating Event Handlers 
 
        public CaseKeyBoxViewModel ViewModel { get; set; }
 
        static void OnValueChanged(DependencyObject sender, DependencyPropertyChangedEventArgs eventArgs)
        {
            ((CaseKeyBox)sender).ViewModel.OnValueChanged();
        } 

        static void OnValueTypeChanged(DependencyObject sender, DependencyPropertyChangedEventArgs eventArgs) 
        { 
            ((CaseKeyBox)sender).ViewModel.OnValueTypeChanged();
        } 

        void OnLabelGotFocus(object sender, RoutedEventArgs e)
        {
            this.ViewModel.OnLabelGotFocus(); 
            e.Handled = true;
        } 
 
        void OnLostKeyboardFocus(object sender, KeyboardFocusChangedEventArgs e)
        { 
            e.Handled = true;

            if (ComboBoxHelper.ShouldFilterUnnecessaryComboBoxEvent(sender as ComboBox))
            { 
                return;
            } 
 
            CommitChanges();
        } 

        public bool CommitChanges()
        {
            UpdateSource(this.visibleBox); 
            if (this.CommitExplicitly || this.ViewModel.TextHasBeenChanged())
            { 
                string reason = null; 
                if (!this.ViewModel.CanResolveInputText(out reason))
                { 
                    ReportError(reason);
                    return false;
                }
                else 
                {
                    return this.ViewModel.OnLostFocus(); 
                } 
            }
            else 
            {
                CancelChanges();
                return false;
            } 
        }
 
        public void CancelChanges() 
        {
            DisableKeyboardLostFocus(); 
            this.ViewModel.OnEscapePressed(); // simulate cancel
        }

        void OnBoxLoaded(object sender, RoutedEventArgs e) 
        {
            UIElement box = (UIElement)sender; 
            ComboBox comboBox = box as ComboBox; 
            if (comboBox != null && comboBox.IsVisible)
            { 
                ComboBoxHelper.SynchronizeComboBoxSelection(comboBox, this.ViewModel.Text);
            }
            if (box.IsVisible)
            { 
                box.Focus();
            } 
            Control control = sender as Control; 
            if (control != null && control.Visibility == Visibility.Visible)
            { 
                this.visibleBox = control;
                EnableKeyboardLostFocus();
            }
 
            this.ViewModel.SaveOldText();
        } 
 
        void OnBoxUnloaded(object sender, RoutedEventArgs e)
        { 
            if (this.visibleBox != null)
            {
                DisableKeyboardLostFocus();
                this.visibleBox = null; 
            }
        } 
 
        void OnBoxKeyDown(object sender, KeyEventArgs e)
        { 
            if (!CommitExplicitly)
            {
                if (e.Key == Key.Escape)
                { 
                    e.Handled = true;
                    CancelChanges(); 
                } 
                else if (e.Key == Key.Enter)
                { 
                    e.Handled = true;
                    CommitChanges();
                }
            } 
        }
 
        void UpdateSource(object sender) 
        {
            if (sender is TextBox) 
            {
                BindingExpression binding = ((TextBox)sender).GetBindingExpression(TextBox.TextProperty);
                if (binding != null)
                { 
                    binding.UpdateSource();
                } 
            } 
            else if (sender is ComboBox)
            { 
                BindingExpression binding = ((ComboBox)sender).GetBindingExpression(ComboBox.TextProperty);
                if (binding != null)
                {
                    binding.UpdateSource(); 
                }
            } 
        } 

        #endregion 

        public void ResetText()
        {
            this.ViewModel.ResetText(); 
        }
    } 
 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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CaseKeyBox.xaml.cs source code in C# .NET

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