private void setYearMode()
{
this.monthUniformGrid.Visibility = this.decadeUniformGrid.Visibility = Visibility.Collapsed;
this.yearUniformGrid.Visibility = Visibility.Visible;
this.titleButton.Content = this.DisplayDate.Year.ToString();
for (int i = 0; i < 4; i++)
{
for (int j = 0; j < 3; j++)
{
int month = j + i * 3 + 1;
if (new PersianDate(DisplayDate.Year, month, PersianDate.DaysInMonth(DisplayDate.Year, month)) >= DisplayDateStart &&
new PersianDate(DisplayDate.Year, month, 1) <= DisplayDateEnd)
{
yearModeButtons[i, j].Content = ((PersianMonth)month).ToString();
yearModeButtons[i, j].IsEnabled = true;
}
else
{
yearModeButtons[i, j].Content = "";
yearModeButtons[i, j].IsEnabled = false;
}
}
}
}
private void previousButton_Click(object sender, RoutedEventArgs e)
{
int m = this.DisplayDate.Month;
int y = this.DisplayDate.Year;
try
{
PersianDate newDisplayDate = DisplayDate;
if (this.DisplayMode == CalendarMode.Month)
{
if (m == 1)
{
newDisplayDate = new PersianDate(y - 1, 12, PersianDate.DaysInMonth(y - 1, 12));
}
else
{
newDisplayDate = new PersianDate(y, m - 1, PersianDate.DaysInMonth(y, m - 1));
}
}
else if (this.DisplayMode == CalendarMode.Year)
{
newDisplayDate = new PersianDate(y - 1, 12, PersianDate.DaysInMonth(y - 1, 12));
}
else if (this.DisplayMode == CalendarMode.Decade)
{
newDisplayDate = new PersianDate(y - y % 10 - 1, 12, PersianDate.DaysInMonth(y - y % 10 - 1, 12));
}
if (newDisplayDate >= DisplayDateStart && newDisplayDate <= DisplayDateEnd)
{
this.SetCurrentValue(DisplayDateProperty, newDisplayDate);
}
}
catch (ArgumentOutOfRangeException)
{
}
}