private CategoryMonthViewModel FindNextCategoryMonth(BudgetEditorViewModel editorViewModel, CategoryMonthViewModel currentCategoryMonth)
{
var budgetMonthViewModel = currentCategoryMonth.BudgetMonthViewModel;
int index = editorViewModel.VisibleMonthViews.IndexOf(budgetMonthViewModel);
int count = editorViewModel.VisibleMonthViews.Count;
int nextMonthIndex;
if (index + 1 == count)
{
nextMonthIndex = 0;
}
else
{
nextMonthIndex = Math.Min(index + 1, count - 1);
}
BudgetMonthViewModel nextMonthViewModel = editorViewModel.VisibleMonthViews[nextMonthIndex];
var firstMasterCategory = editorViewModel.MasterCategories.First(mc => mc.Categories.Count >= 1);
var firstCategory = firstMasterCategory.Categories[0];
return(firstCategory.CategoryMonthViews.Single(cmv => cmv.BudgetMonthViewModel == nextMonthViewModel));
}
private CategoryMonthViewModel FindPreviousCategoryMonth(BudgetEditorViewModel editorViewModel, CategoryMonthViewModel currentCategoryMonth)
{
var budgetMonthViewModel = currentCategoryMonth.BudgetMonthViewModel;
int index = editorViewModel.VisibleMonthViews.IndexOf(budgetMonthViewModel);
int count = editorViewModel.VisibleMonthViews.Count;
int nextMonthIndex;
if (index - 1 == -1)
{
nextMonthIndex = count - 1;
}
else
{
nextMonthIndex = index - 1;
}
BudgetMonthViewModel previousMonthViewModel = editorViewModel.VisibleMonthViews[nextMonthIndex];
var lastMasterCategory = editorViewModel.MasterCategories.Last(mc => mc.Categories.Count >= 1);
var lastCategory = lastMasterCategory.Categories[lastMasterCategory.Categories.Count - 1];
return(lastCategory.CategoryMonthViews.Single(cmv => cmv.BudgetMonthViewModel == previousMonthViewModel));
}
