//
// This changes the editing mode.
// Order in which events occur for the old and new modes:
//
// - Constructor of new mode is called
// - Disengage of old mode is called
// ----- Mode switches -----
// - Engage of new mode is called
// - Dispose of old mode is called
//
// Returns false when cancelled
public bool ChangeMode(EditMode nextmode)
{
EditMode oldmode = mode;
if (nextmode != null)
{
// Verify that this mode is usable
bool allowuse = false;
foreach (EditModeInfo emi in usedmodes)
{
if (emi.Type.FullName == nextmode.GetType().FullName)
{
allowuse = true;
break;
}
}
if (!allowuse)
{
General.Interface.MessageBeep(MessageBeepType.Error);
General.WriteLogLine("Attempt to switch to an invalid edit mode " + nextmode.GetType().Name + "!");
return(false);
}
else
{
General.WriteLogLine("Preparing to change editing mode to " + nextmode.GetType().Name + "...");
}
}
else
{
General.WriteLogLine("Stopping editing mode...");
}
// Remember previous mode
newmode = nextmode;
if (mode != null)
{
prevmode = mode.GetType();
if (!mode.Attributes.Volatile)
{
prevstablemode = prevmode;
if (mode is ClassicMode)
{
prevclassicmode = prevmode;
}
}
}
else
{
prevmode = null;
prevstablemode = null;
prevclassicmode = null;
}
// Let the plugins know beforehand and check if not cancelled
if (General.Plugins.ModeChanges(oldmode, newmode))
{
// Disenagage old mode
disengaging = true;
if (oldmode != null)
{
General.Plugins.OnEditDisengage(oldmode, newmode);
oldmode.OnDisengage();
}
// Reset cursor
General.Interface.SetCursor(Cursors.Default);
// Apply new mode
General.WriteLogLine("Editing mode changes from " + TypeNameOrNull(oldmode) + " to " + TypeNameOrNull(nextmode));
General.WriteLogLine("Previous stable mode is " + TypeNameOrNull(prevstablemode) + ", previous classic mode is " + TypeNameOrNull(prevclassicmode));
mode = newmode;
disengaging = false;
// Engage new mode
if (newmode != null)
{
newmode.OnEngage();
General.Plugins.OnEditEngage(oldmode, newmode);
}
// Bind new switch actions
UnbindSwitchActions();
BindAvailableSwitchActions();
// Update the interface
General.MainWindow.EditModeChanged();
// Dispose old mode
if (oldmode != null)
{
oldmode.Dispose();
}
// Done switching
General.WriteLogLine("Editing mode change complete.");
newmode = null;
// Redraw the display
General.MainWindow.RedrawDisplay();
return(true);
}
else
{
// Cancelled
General.WriteLogLine("Editing mode change cancelled.");
return(false);
}
}
