/*
 * Copyright 2009, Ingo Weinhold, ingo_weinhold@gmx.de.
 * Distributed under the terms of the MIT License.
 */


#include "TableCellValueRendererUtils.h"

#include <Font.h>
#include <String.h>
#include <View.h>


static const float kTextMargin = 8;


/*static*/ void
TableCellValueRendererUtils::DrawString(BView* view, BRect rect,
        const char* string, bool valueChanged, enum alignment alignment,
        bool truncate)
{
        // get font height info
        font_height     fontHeight;
        view->GetFontHeight(&fontHeight);

        // truncate, if requested
        BString truncatedString;
        if (truncate) {
                truncatedString = string;
                view->TruncateString(&truncatedString, B_TRUNCATE_END,
                        rect.Width() - 2 * kTextMargin + 2);
                string = truncatedString.String();
        }

        // compute horizontal position according to alignment
        float x;
        switch (alignment) {
                default:
                case B_ALIGN_LEFT:
                        x = rect.left + kTextMargin;
                        break;

                case B_ALIGN_CENTER:
                        x = rect.left + (rect.Width() - view->StringWidth(string)) / 2;
                        break;

                case B_ALIGN_RIGHT:
                        x = rect.right - kTextMargin - view->StringWidth(string);
                        break;
        }

        // compute vertical position (base line)
        float y = rect.top
                + (rect.Height() - (fontHeight.ascent + fontHeight.descent
                        + fontHeight.leading)) / 2
                + (fontHeight.ascent + fontHeight.descent) - 2;
                // TODO: This is the computation BColumnListView (respectively
                // BTitledColumn) is using, which I find somewhat weird.

        if (valueChanged) {
                view->PushState();
                view->SetHighColor((rgb_color){255, 0, 0, 255});
        }

        view->DrawString(string, BPoint(x, y));

        if (valueChanged)
                view->PopState();
}


/*static*/ float
TableCellValueRendererUtils::PreferredStringWidth(BView* view,
        const char* string)
{
        return view->StringWidth(string) + 2 * kTextMargin;
}