// $Revision: 1.3 $
// Copyright (c) 1994-1995 Taligent, Inc.  All rights reserved.

#ifndef TaligentSamples_POLYGONINTERACTOR
#include "PolygonInteractor.h"
#endif

#ifndef Taligent_GRAPHICS
#include <Taligent/Graphics.h>
#endif

#ifndef Taligent_ASSERTIONS
#include <Taligent/Assertions.h>
#endif

VersionDefinitionsMacro(TPolygonInteractor, 0);

TPolygonInteractor::TPolygonInteractor(TGraphicView* view)
    : TInteractor(), MMouseEventHandler(), fViewHandle(*view), fPoints()
{
    Assertion(view != NIL);
    
    view->AddInteractor(this);
    SetCoordinateView(fViewHandle);
}

TPolygonInteractor::~TPolygonInteractor()
{
    TGraphicView* view = (TGraphicView*)fViewHandle.GetView();
    if (view) {
        view->RemoveInteractor(*this);
    }
}

// The interactor will be called any time the mouse goes down in any view using the same
// event responder.  Note that the window is such a view (!) so in general it is always
// possible this will be called when the mouse is outside the view we're tracking.  This
// differs from when a TView is handling the event-- it will never receive MouseDown
// unless the mouse is in the view.

// Interactors are different from other event handlers in that the event distributor
// will not distribute the event on (via HandleDistributeEvent) if the device has
// an interactor.  An interactor handles all events for its device until it is done,
// so if you want some other handler to get the event, you must stop the interactor, 
// or distribute it to that handler yourself.  See MouseInput6.

// Unfortunately, we don't find out if the mouse goes down in a view hierarchy that uses
// a different responder.  The view that started us will be deactivated, though, so it
// has to override HandleDeactivate and stop us.

// This method results in any of three states:
// 1) the mouse was double-clicked in the view, so close the polyline and stop the interaction.
// 2) the mouse was single-clicked in the view, so extend the polyline.
// 3) the mouse was clicked outside the view, so forget the polyline and stop the interaction.

bool
TPolygonInteractor::MouseButtonDown(TMouseDownEvent& mouseDown, short)
{
    TGraphicView* view = (TGraphicView*)fViewHandle.GetView();
    Assertion(view != NIL);

    TGPoint point = mouseDown.GetEventPosition();
    bool handled = view->ContainsPoint(point);
    if (handled) {
        if (mouseDown.GetClickCount() > 1) {
            view->AdoptGraphic(new TPolygon(fPoints));
            SetDone(true);
        } else {
            fPoints.Append(point);
            view->AdoptGraphic(new TPolyline(fPoints));
        }
    } else {
        view->AdoptGraphic(NIL);
        SetDone(true);
    }
    
    return handled;
}