Coding the ViewEdit Button Event in Microsoft Word

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Coding the ViewEdit Button Event
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When the ViewEdit button is clicked, the ShowNoteList property in NotepadViewModel will be set to true, which will trigger NoteListUserControl to appear. ShowNoteList will be set to true only if there are Notes to be selected.
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CHAPTER 3 USING CLOUD SERVICES AS DATA STORES
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private void btnViewEdit_Click(object sender, RoutedEventArgs e) { if (!string.IsNullOrEmpty(txtNote.Text)) { NotepadViewModel.Instance.SaveNote(txtNoteName.Text, txtNote.Text); } }
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Coding the AddNew Button Event
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When the AddNew button is clicked, SelectedNode in NotepadViewModel will be set to null, triggering the txtNote and txtNoteName contents to be set to empty because they are bound to SelectedNote. Although you can directly set the Text fields of txtNote and txtNoteName to an empty string, we are abstracting this particular task to NotepadViewModel because when the user selects the specific user note from NoteListUserControl, the txtNote and txtNoteName content will be automatically changed because they are bound to SelectedNote. private void btnAddNew_Click(object sender, System.Windows.RoutedEventArgs e) { NotepadViewModel.Instance.SelectedNote = null; }
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Coding the Delete Button Event
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When the Delete button is clicked, the DeleteNote method from the NotepadViewModel instance will be invoked, SelectedNode will be set to null, and txtNote and txtNoteName will be set to an empty string automatically because they are bound to SelectedNode. private void btnDelete_Click(object sender, System.Windows.RoutedEventArgs e) { NotepadViewModel.Instance.DeleteNote(); }
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Coding the BoolToVisibilityConvert
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You will learn to create a custom converter that implements IValueConverter, which can be used during the binding in the control where the bound value can be converted to any value that the control will understand. BoolToVisibilityConvert will convert Boolean value bound to the control Visibility to Visibility enumeration so that the controls can hide and unhide. 1. 2. Right-click the Notepad project and choose Add Add New Item. When the Add New Item window pops up, choose Class and name the class BoolToVisibilityConvert, as shown in Figure 3 32. Click the Add button.
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CHAPTER 3 USING CLOUD SERVICES AS DATA STORES
Figure 3 32. Adding BoolToVisibility class to the project 3. Open BoolToVisibilityConvert.cs and paste the code blocks spelled out in the following sections.
Specifying the Namespaces and Applying IValueConverter Interface
The namespace System.Windows.Data will allow you to declare the IValueConverted interface for the BoolToVisibilityConverter class. using System; using System.Windows; using System.Windows.Data; namespace Notepad { public class BoolToVisibilityConverter : IValueConverter {
CHAPTER 3 USING CLOUD SERVICES AS DATA STORES
Implementing IValueConvert
In order to use the converter in the XAML to convert bound value to the control property or transform to other value, you need to implement the Convert and ConvertBack methods. public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { bool boolValue; if (bool.TryParse(value.ToString(), out boolValue)) { return boolValue Visibility.Visible : Visibility.Collapsed; } else { // By default it will always return Visibility.Collapsed // even for the case where the value is not bool return Visibility.Collapsed; } } public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { Visibility visibilityValue = Visibility.Collapsed; try { visibilityValue = (Visibility)Enum.Parse(typeof(Visibility), (string)value, true); return visibilityValue; } catch (Exception) { // if fails to conver the value to Visibility // it will return Collapsed as default value return visibilityValue; } } } }
Adding Reference to NotepadService
Before you code NotepadViewModel, add a web service reference to the NotepadService WCF service that will be hosted in Azure. 1. Right-click the References folder found under the Notepad project in Solution Explorer, and choose Add Service Reference.
CHAPTER 3 USING CLOUD SERVICES AS DATA STORES
You will be prompted with the Add Service Reference window. In Address put http://127.0.0.1:81/Service.svc, and put NotepadServiceProxy in the Namespace text box. Click the Go button and NotepadService information is retrieved. You will see Service1 in the Services box. When you expand Service1, you will see IService. Click IService and the Operations box will be populated with NotepadService, which you created in the foregoing steps, as shown in Figure 3 33. Click the OK button.
Figure 3 33. Adding service reference to NotepadService
Coding NotepadViewModel
NotepadViewModel is considered the controller of this application, and it controls the events and the data that will manipulate the UI. You can think of it as the brain of the application. 1. 2. Right-click the Notepad project, and choose Add Add New Item. When the Add New Item window pops up, choose Class and name the class NotepadViewModel. Click the Add button. Your Solution Explorer should resemble Figure 3 34.
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