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using System;
using System.ComponentModel;
using System.ComponentModel.Composition;
using System.ServiceModel.DomainServices.Client;
using System.Windows;
using GalaSoft.MvvmLight;
using GalaSoft.MvvmLight.Command;
using GalaSoft.MvvmLight.Messaging;
using IssueVision.Data.Web;
using IssueVision.Common;
namespace IssueVision.ViewModel
{
[Export(ViewModelTypes.NewIssueViewModel, typeof(ViewModelBase))]
[PartCreationPolicy(CreationPolicy.NonShared)]
public class NewIssueViewModel : ViewModelBase
{
#region "Private Data Members"
private IIssueVisionModel _issueVisionModel;
#endregion "Private Data Members"
#region "Constructor"
[ImportingConstructor]
public NewIssueViewModel(IIssueVisionModel issueVisionModel)
{
_issueVisionModel = issueVisionModel;
// set up event handling
_issueVisionModel.SaveChangesComplete += _issueVisionModel_SaveChangesComplete;
_issueVisionModel.PropertyChanged += _issueVisionModel_PropertyChanged;
// initiate a new issue
CurrentIssue = _issueVisionModel.AddNewIssue();
AppMessages.EditIssueMessage.Send(CurrentIssue);
}
#endregion "Constructor"
#region "ICleanup interface implementation"
public override void Cleanup()
{
if (_issueVisionModel != null)
{
// unregister all events
_issueVisionModel.SaveChangesComplete -= _issueVisionModel_SaveChangesComplete;
_issueVisionModel.PropertyChanged -= _issueVisionModel_PropertyChanged;
_issueVisionModel = null;
}
// set properties back to null
CurrentIssue = null;
// unregister any messages for this ViewModel
base.Cleanup();
}
#endregion "ICleanup interface implementation"
#region "Public Properties"
private Issue _currentIssue;
public Issue CurrentIssue
{
get { return _currentIssue; }
private set
{
if (!ReferenceEquals(_currentIssue, value))
{
_currentIssue = value;
RaisePropertyChanged("CurrentIssue");
}
}
}
#endregion "Public Properties"
#region "Public Commands"
private RelayCommand _submitChangeCommand;
public RelayCommand SubmitChangeCommand
{
get
{
if (_submitChangeCommand == null)
{
_submitChangeCommand = new RelayCommand(
OnSubmitChangeCommand,
() => (_issueVisionModel != null) && (_issueVisionModel.HasChanges));
}
return _submitChangeCommand;
}
}
private void OnSubmitChangeCommand()
{
try
{
if (!_issueVisionModel.IsBusy)
{
if (CurrentIssue != null)
{
// this should trigger validation even if the Title is not changed and is null
if (string.IsNullOrWhiteSpace(CurrentIssue.Title))
CurrentIssue.Title = string.Empty;
// if status is Open, AssignedToID should be null
if (CurrentIssue.StatusID == IssueVisionServiceConstant.OpenStatusID)
{
CurrentIssue.AssignedToID = null;
}
// set ResolutionDate and ResolvedByID based on ResolutionID
if (CurrentIssue.ResolutionID == null || CurrentIssue.ResolutionID == 0)
{
CurrentIssue.ResolutionDate = null;
CurrentIssue.ResolvedByID = null;
}
else
{
if (CurrentIssue.ResolutionDate == null)
CurrentIssue.ResolutionDate = DateTime.Now;
if (CurrentIssue.ResolvedByID == null)
CurrentIssue.ResolvedByID = WebContext.Current.User.Identity.Name;
}
if (CurrentIssue.TryValidateObject()
&& CurrentIssue.TryValidateProperty("IssueID")
&& CurrentIssue.TryValidateProperty("Title"))
{
_issueVisionModel.SaveChangesAsync();
}
}
}
}
catch (Exception ex)
{
// notify user if there is any error
AppMessages.RaiseErrorMessage.Send(ex);
}
}
private RelayCommand _cancelChangeCommand;
public RelayCommand CancelChangeCommand
{
get
{
if (_cancelChangeCommand == null)
{
_cancelChangeCommand = new RelayCommand(
OnCancelChangeCommand,
() => (_issueVisionModel != null) && (_issueVisionModel.HasChanges));
}
return _cancelChangeCommand;
}
}
private void OnCancelChangeCommand()
{
try
{
var theResult = MessageBoxResult.Cancel;
if (!_issueVisionModel.IsBusy)
{
// ask to confirm canceling this new issue first
var dialogMessage = new DialogMessage(
this,
CommonResources.CancelCurrentIssueMessageBoxText,
s => theResult = s)
{
Button = MessageBoxButton.OKCancel,
Caption = CommonResources.ConfirmMessageBoxCaption
};
AppMessages.PleaseConfirmMessage.Send(dialogMessage);
if (theResult == MessageBoxResult.OK)
{
// if confirmed, cancel this issue
_issueVisionModel.RejectChanges();
// initiate a new issue again
CurrentIssue = _issueVisionModel.AddNewIssue();
AppMessages.EditIssueMessage.Send(CurrentIssue);
}
}
}
catch (Exception ex)
{
// notify user if there is any error
AppMessages.RaiseErrorMessage.Send(ex);
}
}
#endregion "Public Commands"
#region "Private Methods"
private void _issueVisionModel_SaveChangesComplete(object sender, SubmitOperationEventArgs e)
{
if (!e.HasError)
{
// notify user of the new issue ID
foreach (Entity entity in e.SubmitOp.ChangeSet.AddedEntities)
{
var addedIssue = entity as Issue;
if (addedIssue != null)
{
// notify user of the new issue ID
var dialogMessage = new DialogMessage(
this,
CommonResources.NewIssueCreatedText + addedIssue.IssueID,
null)
{
Button = MessageBoxButton.OK,
Caption = CommonResources.NewIssueCreatedCaption
};
AppMessages.StatusUpdateMessage.Send(dialogMessage);
}
}
// save is successful, start another new issue
CurrentIssue = _issueVisionModel.AddNewIssue();
AppMessages.EditIssueMessage.Send(CurrentIssue);
}
else
{
// notify user if there is any error
AppMessages.RaiseErrorMessage.Send(e.Error);
}
}
private void _issueVisionModel_PropertyChanged(object sender, PropertyChangedEventArgs e)
{
if (e.PropertyName.Equals("HasChanges"))
{
SubmitChangeCommand.RaiseCanExecuteChanged();
CancelChangeCommand.RaiseCanExecuteChanged();
}
}
#endregion "Private Methods"
}
}
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Weidong has been an information system professional since 1990. He has a Master's degree in Computer Science, and is currently a MCSD .NET