protected override void OnPreviewKeyDown(KeyEventArgs e)
{
if (e.Key == Key.Tab)
{
TextBox textBox = e.OriginalSource as TextBox;
BudgetEditorCategoryMonth monthView = FindParent(textBox);
BudgetEditorCategoryRow categoryRow = monthView.FindParent <BudgetEditorCategoryRow>();
if (textBox != null && monthView != null && categoryRow != null)
{
if ((Keyboard.Modifiers & ModifierKeys.Shift) == ModifierKeys.Shift)
{
e.Handled = NavigatePreviousCategoryMonth(textBox, categoryRow, monthView);
}
else
{
e.Handled = NavigateNextCategoryMonth(textBox, categoryRow, monthView);
}
}
}
base.OnPreviewKeyDown(e);
}
private bool NavigateNextCategoryMonth(TextBox textBox, BudgetEditorCategoryRow row, BudgetEditorCategoryMonth monthView)
{
if (!(this.DataContext is BudgetEditorViewModel editorViewModel))
{
return(false);
}
if (!(row.DataContext is CategoryRowViewModel rowViewModel))
{
return(false);
}
if (!(monthView.DataContext is CategoryMonthViewModel monthViewModel))
{
return(false);
}
var lastRow = rowViewModel.MasterCategory.Categories[rowViewModel.MasterCategory.Categories.Count - 1];
if (rowViewModel == rowViewModel.MasterCategory.Categories.Last() && rowViewModel.MasterCategory == editorViewModel.MasterCategories.Last())
{
var nextCategoryMonth = FindNextCategoryMonth(editorViewModel, monthViewModel);
var nextTextBox = FindAmountBudgetedTextBox(nextCategoryMonth);
if (nextTextBox != null)
{
nextTextBox.Focus();
nextTextBox.BringIntoView();
return(true);
}
else
{
return(false);
}
}
else
{
TraversalRequest request = new TraversalRequest(FocusNavigationDirection.Down);
textBox.MoveFocus(request);
return(true);
}
}
private bool NavigatePreviousCategoryMonth(TextBox textBox, BudgetEditorCategoryRow row, BudgetEditorCategoryMonth monthView)
{
if (!(this.DataContext is BudgetEditorViewModel editorViewModel))
{
return(false);
}
if (!(row.DataContext is CategoryRowViewModel rowViewModel))
{
return(false);
}
if (!(monthView.DataContext is CategoryMonthViewModel monthViewModel))
{
return(false);
}
if (rowViewModel == rowViewModel.MasterCategory.Categories.First() && rowViewModel.MasterCategory == editorViewModel.MasterCategories.First())
{
var previousCategoryMonth = FindPreviousCategoryMonth(editorViewModel, monthViewModel);
var previousTextBox = FindAmountBudgetedTextBox(previousCategoryMonth);
if (previousTextBox != null)
{
previousTextBox.Focus();
previousTextBox.BringIntoView();
return(true);
}
else
{
return(false);
}
}
else
{
TraversalRequest request = new TraversalRequest(FocusNavigationDirection.Up);
textBox.MoveFocus(request);
return(true);
}
}
