/****************************************************************************
**
** Copyright (C) 1992-2005 Trolltech AS. All rights reserved.
**
** This file is part of the widgets module of the Qt Toolkit.
**
** This file may be distributed under the terms of the Q Public License
** as defined by Trolltech AS of Norway and appearing in the file
** LICENSE.QPL included in the packaging of this file.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
**
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**   information about Qt Commercial License Agreements.
** See http://www.trolltech.com/qpl/ for QPL licensing information.
** See http://www.trolltech.com/gpl/ for GPL licensing information.
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** not clear to you.
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** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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****************************************************************************/

#include "qdockwidgetseparator_p.h"

#include "qdockwidget.h"
#include "qdockwidgetlayout_p.h"

#include <qapplication.h>
#include <qevent.h>
#include <qpainter.h>
#include <qstyle.h>
#include <qstyleoption.h>


QDockWidgetSeparator::QDockWidgetSeparator(QDockWidgetLayout *l, QWidget *parent)
    : QWidget(parent), layout(l), state(0)
{ setCursor(layout->orientation == Qt::Horizontal ? Qt::SplitHCursor : Qt::SplitVCursor); }

/*!
    Returns a rectangle centered around \a point.  The parent dock
    orientation is used to calculate a rectangle that is appropriate
    for use while the user is moving the separator.
 */
QRect QDockWidgetSeparator::calcRect(const QPoint &point)
{
    int pos = pick(layout->orientation, point);
    int ext = pick(layout->orientation, size());
    int sz = pick_perp(layout->orientation, size());
    return (layout->orientation == Qt::Horizontal ?
	    QRect(pos - (ext/2), 0, ext, sz) :
	    QRect(0, pos - (ext/2), sz, ext));
}

void QDockWidgetSeparator::mousePressEvent(QMouseEvent *event)
{
    if (event->button() != Qt::LeftButton)
        return;

    Q_ASSERT(!state);
    state = new DragState;

    state->origin = state->last = parentWidget()->mapFromGlobal(event->globalPos());

    // clear focus... it will be restored when the mouse button is released
    state->prevFocus = qApp->focusWidget();
    if (state->prevFocus)
        state->prevFocus->clearFocus();

    layout->saveLayoutInfo();
}

void QDockWidgetSeparator::mouseReleaseEvent(QMouseEvent *event)
{
    if (event->button() != Qt::LeftButton)
        return;

    layout->relayout();
    layout->discardLayoutInfo();

    Q_ASSERT(state != 0);

    // restore focus
    if (state->prevFocus)
        state->prevFocus->setFocus();
    state->prevFocus = 0;

    delete state;
    state = 0;
}

void QDockWidgetSeparator::mouseMoveEvent(QMouseEvent *event)
{
    Q_ASSERT(state != 0);

    QPoint p = parentWidget()->mapFromGlobal(event->globalPos());
    int delta = pick(layout->orientation, p - state->origin);

    // constrain the mouse move event
    layout->resetLayoutInfo();
    p = state->origin + layout->constrain(this, delta);
    if (p == state->last)
        return;
    state->last = p;

    layout->relayout();
}

void QDockWidgetSeparator::paintEvent(QPaintEvent *)
{
    QPainter p(this);
    QStyleOption opt(0);
    opt.state = QStyle::State_None;
    if (isEnabled())
	opt.state |= QStyle::State_Enabled;
    if (layout->orientation != Qt::Horizontal)
	opt.state |= QStyle::State_Horizontal;
    opt.rect = rect();
    opt.palette = palette();
    style()->drawPrimitive(QStyle::PE_IndicatorDockWidgetResizeHandle, &opt, &p, this);
}
