public ExpenseViewBehavior(IExpenseView expenseView)
{
if (expenseView == null)
{
throw new ArgumentNullException("Class decorator can't have a null IExpenseView");
}
this.ExpenseView = expenseView;
}
/// <summary>
/// Decorate the base expense View based on the type and behaviors of the current expense.
/// </summary>
/// <param name="expense"></param>
public static ExpenseMainView CreateExpenseView(msdyn_expense expense)
{
// base view for any kind of expense
ExpenseMainView expenseView = new ExpenseMainView(expense);
IExpenseView decoratedExpenseView = expenseView;
// Decorate with Receipt behavior
decoratedExpenseView = new ReceiptBehaviorView(expenseView);
expenseView.ExtendedExpenseBehavior = decoratedExpenseView;
decoratedExpenseView.CreateContent();
return(expenseView);
}
/// <summary>
/// Change at runtime the behaviors of the selected expense
/// </summary>
/// <param name="currentExpenseView"></param>
/// <returns></returns>
public static IExpenseView DecorateExpenseView(IExpenseView currentExpenseView)
{
if (currentExpenseView != null)
{
msdyn_expense expense = currentExpenseView.GetExpense();
IExpenseView decoratedExpenseView = currentExpenseView;
// Check if Receipt Decorator still valid
ReceiptBehaviorView receiptBehavior = decoratedExpenseView as ReceiptBehaviorView;
return(decoratedExpenseView);
}
return(null);
}
/// <summary>
/// Check the behaviors of the new category, if there is data that needs to be deleted,
/// show a warning message to the user before change category.
/// </summary>
/// <param name="newExpenseCategory">expense category selected by the user</param>
/// <param name="warningMessage">If there is data to delete, message with details of the data to be deleted</param>
/// <returns>true if the change of category was successful</returns>
public async Task <bool> SetCategory(msdyn_expensecategory newExpenseCategory, string warningMessage = null)
{
bool allowSetCategory = true;
if (!string.IsNullOrEmpty(warningMessage))
{
// Confirm with user the change of category
string message = string.Format(AppResources.ChangeExpenseTypeWarning, warningMessage);
allowSetCategory = await MessageCenter.ShowDialog(message, null, null);
}
if (allowSetCategory)
{
this.ViewModel.Expense.ExpenseCategory = newExpenseCategory;
// Change category and update new view
this.ExtendedExpenseBehavior = ExpenseViewFactory.DecorateExpenseView(this.ExtendedExpenseBehavior);
await this.ExtendedExpenseBehavior.CreateContent();
}
return(allowSetCategory);
}
public ReceiptBehaviorView(IExpenseView baseExpenseView) : base(baseExpenseView)
{
this.ViewModel = new ReceiptViewModel(this.GetExpense());
}