Sitecore Workflow and Pipelines

Question

I'm trying to implement a basic Javascript confirmation box on a workflow command (e.g. "are you sure you want to edit this?"). Depending on whether a users clicks yes or no, I want to move to a different state in the workflow. Here is the code I currently have (some logic is taken out):

[Serializable]
public class ConfirmAction
{
    public void Process(WorkflowPipelineArgs args)
    {
        Item currentItem = args.DataItem;
        ClientPipelineArgs clientArgs = new ClientPipelineArgs();
        Sitecore.Context.ClientPage.Start(this, "DialogProcessor", clientArgs);
    }

    protected void DialogProcessor(ClientPipelineArgs args)
    {
        if (args.IsPostBack)
        {
            if (args.Result != "yes")
            {
                args.AbortPipeline();
                return;
            }
        }

        else
        {
            Sitecore.Context.ClientPage.ClientResponse.Confirm("Are you sure you want to edit this?");
            args.WaitForPostBack();
        }
    }
}

I'm new to the Pipeline model, especially in relation to Sitecore, so I'm somewhat grasping at straws. The problem that I'm having, I believe, is that I don't have a way of getting the result back to the Workflow Pipeline, from the ClientResponse pipeline, to tell it what to do.

Thank you.

EDIT:

Using Yan's information, I eventually came up with the following solution:

public void Process(WorkflowPipelineArgs args)
{
    Item currentItem = args.DataItem;
    ClientPipelineArgs clientArgs = new ClientPipelineArgs();
    clientArgs.Parameters.Add("itemID", currentItem.ID.ToString());
    clientArgs.Parameters.Add("stateID", currentItem.Fields["__Workflow state"].Value);
    Sitecore.Context.ClientPage.Start(this, "DialogProcessor", clientArgs);
}

protected void DialogProcessor(ClientPipelineArgs args)
{
    if (args.IsPostBack)
    {
        if (args.Result != "yes")
        {
            Item currentItem = Sitecore.Configuration.Factory.GetDatabase("master").GetItem(args.Parameters["itemID"]);
            currentItem.Editing.BeginEdit();
            currentItem.Fields["__Workflow state"].Value = args.Parameters["stateID"];
            currentItem.Editing.EndEdit();                   
            return;
        }
        SheerResponse.Eval("window.location.reload();");                
    }

    else
    {
        Sitecore.Context.ClientPage.ClientResponse.YesNoCancel("Are you sure you want to edit this?", "200", "200");
        args.WaitForPostBack();
    }
}

Answer 1

Well, I think this is where you can take advantage from ClientPipelineArgs. Let's say you add the current item ID to the parameters to pass:

public void Process(WorkflowPipelineArgs args)
{
    Item currentItem = args.DataItem;
    ClientPipelineArgs clientArgs = new ClientPipelineArgs();
    clientArgs.Parameters.Add("id", currentItem.ID.ToString());
    Sitecore.Context.ClientPage.Start(this, "DialogProcessor", clientArgs);
}

and later on when you get positive result you get it back and move to the target workflow state (explained in comments):

protected void DialogProcessor(ClientPipelineArgs args)
{
    if (args.IsPostBack)
    {
        if (args.Result == "yes")
        {
            // 1. take item ID from args.Parameters["id"];
            // 2. get item by this ID
            // 3. move item to target workflow state
        }
    }
    else
    {
        Sitecore.Context.ClientPage.ClientResponse.Confirm("Are you sure you want to edit this?");
        args.WaitForPostBack();
    }
}

This might require some minor changes (I didn't run it myself before posting), but hope you get the idea.