public void Present(Proposal action)
{
var needsRefresh = false;
if (action is SetFile)
{
_filename = ((SetFile)action).FileName;
_source = ((SetFile)action).Source;
needsRefresh = true;
_lastError = null;
}
else if (action is RefreshFromFile)
{
_source = ((RefreshFromFile)action).Source;
needsRefresh = true;
_lastError = null;
}
else if (action is SelectElement)
{
var elem = ((SelectElement)action).Element;
_selected = elem;
_lastError = null;
}
else if (action is ShowError)
{
var act = ((ShowError)action);
_lastError = new Exception(act.Context, act.Exception);
}
else
{
throw new Exception("Unsupported action type: " + action.GetType().Name);
}
if (needsRefresh)
{
try
{
var render = new XamlRenderer(null);
byte[] byteArray = Encoding.UTF8.GetBytes(_source);
using (var stream = new System.IO.MemoryStream(byteArray))
{
var tree = render.Render(stream);
this._selected = tree;
this._tree = tree;
}
}
catch (Exception e)
{
// keep everything else intact
this._lastError = new Exception("Failed to refresh from file", e);
}
}
}
public void Store(Proposal toStore)
{
Console.WriteLine($"Writing proposal of type {toStore.GetType().Name}...");
}