/*
 * Copyright 2006, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
 * Distributed under the terms of the MIT License.
 */


#include "DropTargetListView.h"


DropTargetListView::DropTargetListView(const char* name,
                list_view_type type, uint32 flags)
        : BListView(name, type, flags),
        fDropTarget(false)
{
}


DropTargetListView::~DropTargetListView()
{
}


void
DropTargetListView::Draw(BRect updateRect)
{
        BListView::Draw(updateRect);

        if (fDropTarget) {
                // mark this view as a drop target
                rgb_color color = HighColor();

                SetHighColor(0, 0, 0);
                SetPenSize(2);
                BRect rect = Bounds();
// TODO: this is an incompatibility between R5 and Haiku and should be fixed!
#ifdef HAIKU_TARGET_PLATFORM_HAIKU
                rect.left++;
                rect.top++;
#else
                rect.right--;
                rect.bottom--;
#endif
                StrokeRect(rect);

                SetPenSize(1);
                SetHighColor(color);
        }
}


void
DropTargetListView::MouseMoved(BPoint where, uint32 transit,
        const BMessage* dragMessage)
{
        if (dragMessage != NULL && AcceptsDrag(dragMessage)) {
                bool dropTarget = transit == B_ENTERED_VIEW || transit == B_INSIDE_VIEW;
                if (dropTarget != fDropTarget) {
                        fDropTarget = dropTarget;
                        _InvalidateFrame();
                }
        } else if (fDropTarget) {
                fDropTarget = false;
                _InvalidateFrame();
        }
}


bool
DropTargetListView::AcceptsDrag(const BMessage* /*message*/)
{
        return true;
}


void
DropTargetListView::_InvalidateFrame()
{
        // only update the parts affected by the change to reduce flickering
        BRect rect = Bounds();
        rect.right = rect.left + 1;
        Invalidate(rect);
        
        rect = Bounds();
        rect.left = rect.right - 1;
        Invalidate(rect);

        rect = Bounds();
        rect.bottom = rect.top + 1;
        Invalidate(rect);

        rect = Bounds();
        rect.top = rect.bottom - 1;
        Invalidate(rect);
}