/*
 * Copyright 2014, Stephan Aßmus <superstippi@gmx.de>.
 * All rights reserved. Distributed under the terms of the MIT License.
 */


#include "LinkView.h"

#include <Cursor.h>
#include <String.h>


LinkView::LinkView(const char* name, const char* string, BMessage* message)
        :
        BStringView(name, string),
        BInvoker(message, NULL),
        fEnabled(true),
        fMouseInside(false)
{
        SetExplicitMaxSize(BSize(B_SIZE_UNLIMITED, B_SIZE_UNSET));
        SetExplicitMinSize(BSize(120, B_SIZE_UNSET));
}


void
LinkView::AttachedToWindow()
{
        _UpdateLinkColor();
}


void
LinkView::MouseMoved(BPoint where, uint32 transit, const BMessage* dragMessage)
{
        // TODO: Check that no buttons are pressed, don't indicate clickable
        // link if a button is held.
        if (transit == B_ENTERED_VIEW) {
                fMouseInside = true;
                _UpdateLinkColor();
        } else if (transit == B_EXITED_VIEW) {
                fMouseInside = false;
                _UpdateLinkColor();
        }
}


void
LinkView::MouseDown(BPoint where)
{
        if (fEnabled)
                Invoke(Message());
}


void
LinkView::Draw(BRect updateRect)
{
        if (Text() == NULL)
                return;

        SetDrawingMode(B_OP_ALPHA);

        font_height fontHeight;
        GetFontHeight(&fontHeight);

        BRect bounds = Bounds();

        float y = (bounds.top + bounds.bottom - ceilf(fontHeight.ascent)
                - ceilf(fontHeight.descent)) / 2.0 + ceilf(fontHeight.ascent);
        float x = 0.0f;

        BString text(Text());
        TruncateString(&text, B_TRUNCATE_END, bounds.Width());
        DrawString(text, BPoint(x, y));
}


void
LinkView::SetEnabled(bool enabled)
{
        if (fEnabled != enabled) {
                fEnabled = enabled;
                _UpdateLinkColor();
        }
}


void
LinkView::MessageReceived(BMessage* message)
{
        if (message->what == B_COLORS_UPDATED)
                _UpdateLinkColor();

        BStringView::MessageReceived(message);
}


void
LinkView::_UpdateLinkColor()
{
        BCursorID cursorID = B_CURSOR_ID_SYSTEM_DEFAULT;

        float tint = B_DARKEN_1_TINT;
        ViewUIColor(&tint);

        if (fEnabled) {
                if (fMouseInside) {
                        cursorID = B_CURSOR_ID_FOLLOW_LINK;
                        SetHighUIColor(B_LINK_HOVER_COLOR, tint);
                } else
                        SetHighUIColor(B_LINK_TEXT_COLOR, tint);
        } else
                SetHighColor(disable_color(ui_color(B_LINK_TEXT_COLOR), ViewColor()));

        BCursor cursor(cursorID);
        SetViewCursor(&cursor, true);
        Invalidate();
}