/*
 * Copyright 2007, Ingo Weinhold <bonefish@cs.tu-berlin.de>.
 * All rights reserved. Distributed under the terms of the MIT License.
 */

#include "TwoDimensionalSliderView.h"

#include <View.h>


TwoDimensionalSliderView::TwoDimensionalSliderView(BMessage* message,
        BMessenger target)
        : View(BRect(0, 0, 4, 4)),
          BInvoker(message, target),
          fMinLocation(0, 0),
          fMaxLocation(0, 0),
          fDragging(false)
{
        SetViewColor((rgb_color){255, 0, 0, 255});
}


void
TwoDimensionalSliderView::SetLocationRange(BPoint minLocation,
        BPoint maxLocation)
{
        if (maxLocation.x < minLocation.x)
                maxLocation.x = minLocation.x;
        if (maxLocation.y < minLocation.y)
                maxLocation.y = minLocation.y;

        fMinLocation = minLocation;
        fMaxLocation = maxLocation;

        // force valid value
        SetValue(Value());
}


BPoint
TwoDimensionalSliderView::MinLocation() const
{
        return fMinLocation;
}


BPoint
TwoDimensionalSliderView::MaxLocation() const
{
        return fMaxLocation;
}


BPoint
TwoDimensionalSliderView::Value() const
{
        return Location() - fMinLocation;
}


void
TwoDimensionalSliderView::SetValue(BPoint value)
{
        BPoint location = fMinLocation + value;
        if (location.x < fMinLocation.x)
                location.x = fMinLocation.x;
        if (location.y < fMinLocation.y)
                location.y = fMinLocation.y;
        if (location.x > fMaxLocation.x)
                location.x = fMaxLocation.x;
        if (location.y > fMaxLocation.y)
                location.y = fMaxLocation.y;

        if (location != Location()) {
                SetFrame(Frame().OffsetToCopy(location));

                // send the message
                if (Message()) {
                        BMessage message(*Message());
                        message.AddPoint("value", Value());
                        InvokeNotify(&message);
                }
        }
}


void
TwoDimensionalSliderView::MouseDown(BPoint where, uint32 buttons,
        int32 modifiers)
{
        if (fDragging)
                return;

        fOriginalLocation = Frame().LeftTop();
        fOriginalPoint = ConvertToContainer(where);
        fDragging = true;
}


void
TwoDimensionalSliderView::MouseUp(BPoint where, uint32 buttons, int32 modifiers)
{
        if (!fDragging || (buttons & B_PRIMARY_MOUSE_BUTTON))
                return;

        fDragging = false;
}


void
TwoDimensionalSliderView::MouseMoved(BPoint where, uint32 buttons,
        int32 modifiers)
{
        if (!fDragging)
                return;

        BPoint moved = ConvertToContainer(where) - fOriginalPoint;
        SetValue(fOriginalLocation - fMinLocation + moved);
}