/// <summary>
/// Handles mouse-left-button-down event for placing a heat exchanger with utility
/// </summary>
public void MLBD_HEWU(object sender, MouseButtonEventArgs e)
{
// Start by getting the mouse position
Point pos = e.GetPosition(m_canvas);
// See if we have a DraggableStreamEndpoint where we clicked
DraggableStreamEndpoint endpoint = m_canvas.GetChildAt(pos, m_placementIcon) as
DraggableStreamEndpoint;
// Remove the placement icon and then set it to null to indicate state completion
m_canvas.RemoveChild(m_placementIcon);
m_placementIcon = null;
// If there's not an endpoint:
// 1. Create and attach an incoming heat stream. Position the source endpoint just
// below the process unit
// 2. Create an undo that will remove both
// 3. Switch to the appropriate state for moving the source endpoint
if (null == endpoint)
{
// Create the actual process unit
AbstractProcessUnit apu = (AbstractProcessUnit)Activator.CreateInstance(
m_type, AbstractProcessUnit.GetNextUID());
apu.Location = new MathCore.Vector(pos.X, pos.Y);
HeatStream s = new HeatStream();
apu.AttachIncomingStream(s);
s.Destination = apu;
s.PropertiesTable = new StreamPropertiesTable(s);
// Position the source of the heat stream. It's above the process unit by default, unless
// that would make it go off the screen
if (apu.Location.Y < 150.0)
{
s.SourceLocation = new MathCore.Vector(
apu.Location.X - 10.0, apu.Location.Y + 80.0);
s.PropertiesTable.Location = new MathCore.Vector(
apu.Location.X + 10.0, apu.Location.Y + 140.0);
}
else
{
s.SourceLocation = new MathCore.Vector(
apu.Location.X - 10.0, apu.Location.Y - 80.0);
s.PropertiesTable.Location = new MathCore.Vector(
apu.Location.X + 10.0, apu.Location.Y - 100.0);
}
// Add the stream and the process unit to the workspace. Event handlers will update
// the UI appropriately.
m_workspace.AddProcessUnit(apu);
m_workspace.AddStream(s);
m_workspace.AddUndo(new UndoRedoCollection("Undo creation of heat exchanger with utility",
new Logic.Undos.DetachIncomingStream(apu, s),
new Logic.Undos.SetStreamDestination(s, null, apu, s.DestinationLocation),
new Logic.Undos.RemoveStream(s),
new Logic.Undos.RemoveProcessUnit(apu)));
// Select nothing on the canvas
m_canvas.SelectedElement = null;
m_palette.SwitchToSelect();
return;
}
// Otherwise, if we HAVE clicked on an endpoint, just deny it by doing nothing
}
public void MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
// We don't process messages if the placement icon is null
if (null == m_placementIcon)
{
return;
}
// Handle heat exchanger with utility as a special case
if (m_type.Equals(typeof(HeatExchangerWithUtility)))
{
MLBD_HEWU(sender, e);
return;
}
// Start by getting the mouse position
Point pos = e.GetPosition(m_canvas);
MathCore.Vector vPos = new MathCore.Vector(pos.X, pos.Y);
// See if we have a DraggableStreamEndpoint where we clicked
DraggableStreamEndpoint endpoint = m_canvas.GetChildAt(pos, m_placementIcon) as
DraggableStreamEndpoint;
// Remove the placement icon and then set it to null to indicate state completion
m_canvas.RemoveChild(m_placementIcon);
m_placementIcon = null;
// Determine a unique identifier for the process unit
int uid;
do
{
uid = AbstractProcessUnit.GetNextUID();
}while (null != m_workspace.GetProcessUnit(uid));
// If there's not an endpoint, we create the process unit with no stream connections
if (null == endpoint)
{
AbstractProcessUnit unit = (AbstractProcessUnit)Activator.CreateInstance(
m_type, uid);
// Set the location
unit.Location = new MathCore.Vector(pos.X, pos.Y);
// Add it to the workspace
m_workspace.AddProcessUnit(unit);
// Add an undo that will remove it
m_workspace.AddUndo(new UndoRedoCollection("Undo process unit creation",
new ChemProV.Logic.Undos.RemoveProcessUnit(unit)));
m_canvas.SelectedElement = null;
// Tell the control palette to switch back to select mode and then return
m_palette.SwitchToSelect();
return;
}
// Otherwise, if we HAVE clicked on an endpoint...
// Check to see if we can't connect this way
AbstractProcessUnit temp = (AbstractProcessUnit)
Activator.CreateInstance(m_type, -1);
if (!endpoint.CanConnectTo(temp))
{
// The usability here may be debatable. But for now we'll cancel placement and
// give the user an error message
m_palette.SwitchToSelect();
Core.App.MessageBox("The stream endpoint that you clicked cannot connect with " +
"the process unit that you were placing.");
return;
}
// Otherwise, if we CAN connect this way...
// Create the process unit
AbstractProcessUnit apu = (AbstractProcessUnit)
Activator.CreateInstance(m_type, uid);
// Make the undo and then the actual attachment
if (DraggableStreamEndpoint.EndpointType.StreamDestination == endpoint.Type)
{
// Set the location
apu.Location = endpoint.ParentStream.Stream.DestinationLocation;
// Create an undo that sets the stream destination back to what it was and removes the
// process unit
m_workspace.AddUndo(new UndoRedoCollection("Undo process unit creation + attachment",
new Logic.Undos.SetStreamDestination(endpoint.ParentStream.Stream, null, apu, vPos),
new Logic.Undos.RemoveProcessUnit(apu)));
apu.AttachIncomingStream(endpoint.ParentStream.Stream);
endpoint.ParentStream.Stream.Destination = apu;
}
else
{
// Set the location
apu.Location = endpoint.ParentStream.Stream.SourceLocation;
// Create an undo that sets the stream source back to what it was and removes the
// process unit from the canvas
AbstractStream stream = endpoint.ParentStream.Stream;
m_workspace.AddUndo(new UndoRedoCollection("Undo process unit creation + attachment",
new Logic.Undos.SetStreamSource(stream, null, apu, stream.SourceLocation),
new Logic.Undos.RemoveProcessUnit(apu)));
apu.AttachOutgoingStream(endpoint.ParentStream.Stream);
endpoint.ParentStream.Stream.Source = apu;
}
// Don't forget to add the process unit to the workspace. Event handlers will update the
// UI appropriately.
m_workspace.AddProcessUnit(apu);
m_canvas.SelectedElement = null;
// Go back to select mode
m_palette.SwitchToSelect();
}