/// <summary>
/// 更新按钮状态
/// </summary>
private void upButtonStatus()
{
FirstPageCommand.RaiseCanExecuteChanged();
PreviousPageCommand.RaiseCanExecuteChanged();
NextPageCommand.RaiseCanExecuteChanged();
LastPageCommand.RaiseCanExecuteChanged();
}
private void ExecuteSelectPreviousPage()
{
WizardPage previousPage = null;
if (PreviousPageCommand?.CanExecute(CanSelectPreviousPage) == true)
{
PreviousPageCommand?.Execute(CanSelectPreviousPage);
}
if (CurrentPage != null)
{
var eventArgs = new RoutedEventArgs(PreviousEvent);
this.RaiseEvent(eventArgs);
//if (eventArgs.Cancel)
// return;
//check previous page
if (CurrentPage.PreviousPage != null)
{
previousPage = CurrentPage.PreviousPage;
}
else
{
//no previous page defined so use index
var currentIndex = Items.OfType <WizardPage>().ToList().IndexOf(CurrentPage);
var previousPageIndex = currentIndex - 1;
if (previousPageIndex >= 0 && previousPageIndex < Items.OfType <WizardPage>().Count())
{
previousPage = Items.OfType <WizardPage>().ToList()[previousPageIndex];
}
}
}
CurrentPage = previousPage;
}
public PaginationViewModel()
{
CurrentPageIndex = 0;
NextCommand = new NextPageCommand(this);
PreviousCommand = new PreviousPageCommand(this);
FirstCommand = new FirstPageCommand(this);
LastCommand = new LastPageCommand(this);
}
public virtual bool Equals(PreviousPageCommand other)
{
if (ReferenceEquals(null, other))
return false;
if (ReferenceEquals(this, other))
return true;
return Equals(other.display, display) && Equals(other.browsable, browsable);
}
private void InitiateCommands()
{
_firstPageCommand = new FirstPageCommand();
_firstPageCommand.FirstPage += _FirstPage;
_previousPageCommand = new PreviousPageCommand();
_previousPageCommand.PreviousPage += _PreviousPage;
_nextPageCommand = new NextPageCommand();
_nextPageCommand.NextPage += _NextPage;
_lastPageCommand = new LastPageCommand();
_lastPageCommand.LastPage += _LastPage;
}
public MainViewModel()
{
populateList();
ViewList = new CollectionViewSource();
ViewList.Source = PeopleList;
ViewList.Filter += new FilterEventHandler(view_Filter);
CurrentPageIndex = 0;
itemcount = peopleList.Count;
CalculateTotalPages();
NextCommand = new NextPageCommand(this);
PreviousCommand = new PreviousPageCommand(this);
FirstCommand = new FirstPageCommand(this);
LastCommand = new LastPageCommand(this);
}
public MainViewModel(string jsonStream)
{
var streamList = JsonConvert.DeserializeObject <List <Person> >(jsonStream);
peopleList = new ObservableCollection <Person>(streamList);
ViewList = new CollectionViewSource();
ViewList.Source = peopleList;
ViewList.Filter += new FilterEventHandler(view_Filter);
CurrentPageIndex = 0;
itemsCount = peopleList.Count;
CalculateTotalPages();
NextCommand = new NextPageCommand(this);
PreviousCommand = new PreviousPageCommand(this);
JumpToCommand = new JumpToCommand(this);
}
protected override void OnPropertyChanged(AvaloniaPropertyChangedEventArgs e)
{
base.OnPropertyChanged(e);
if (
e.Property.Name == nameof(CanSelectNextPage) ||
(e.Property.Name == nameof(CanHelp)) ||
(e.Property.Name == nameof(CanFinish)) ||
(e.Property.Name == nameof(CanCancel)) ||
(e.Property.Name == nameof(CanSelectPreviousPage)) ||
(e.Property.Name == nameof(CurrentPage))
)
{
CancelCommand?.CanExecute(CanCancel);
FinishCommand?.CanExecute(CanFinish);
PreviousPageCommand?.CanExecute(CanSelectPreviousPage);
NextPageCommand?.CanExecute(CanSelectNextPage);
HelpCommand?.CanExecute(CanHelp);
UpdateButtonState();
}
}
