/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt Creator.
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** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
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****************************************************************************/

#include "widgethost.h"
#include "formresizer.h"
#include "widgethostconstants.h"

#include <QDesignerFormWindowInterface>
#include <QDesignerFormWindowCursorInterface>

#include <QPalette>
#include <QLayout>
#include <QFrame>
#include <QResizeEvent>
#include <QDebug>

using namespace SharedTools;

// ---------- WidgetHost
WidgetHost::WidgetHost(QWidget *parent, QDesignerFormWindowInterface *formWindow) :
    QScrollArea(parent),
    m_formResizer(new Internal::FormResizer)
{
    setWidget(m_formResizer);
    // Re-set flag (gets cleared by QScrollArea): Make the resize grip of a mainwindow form find the resizer as resizable window.
    m_formResizer->setWindowFlags(m_formResizer->windowFlags() | Qt::SubWindow);
    setFormWindow(formWindow);
}

WidgetHost::~WidgetHost()
{
    delete m_formWindow;
}

void WidgetHost::setFormWindow(QDesignerFormWindowInterface *fw)
{
    m_formWindow = fw;
    if (!fw)
        return;

    m_formResizer->setFormWindow(fw);

    setBackgroundRole(QPalette::Base);
    m_formWindow->setAutoFillBackground(true);
    m_formWindow->setBackgroundRole(QPalette::Window);

    connect(m_formResizer, &Internal::FormResizer::formWindowSizeChanged,
            this, &WidgetHost::fwSizeWasChanged);
}

QSize WidgetHost::formWindowSize() const
{
    if (!m_formWindow || !m_formWindow->mainContainer())
        return {};
    return m_formWindow->mainContainer()->size();
}

void WidgetHost::fwSizeWasChanged(const QRect &, const QRect &)
{
    // newGeo is the mouse coordinates, thus moving the Right will actually emit wrong height
    emit formWindowSizeChanged(formWindowSize().width(), formWindowSize().height());
}

void WidgetHost::updateFormWindowSelectionHandles(bool active)
{
    Internal::SelectionHandleState state = Internal::SelectionHandleOff;
    const QDesignerFormWindowCursorInterface *cursor = m_formWindow->cursor();
    if (cursor->isWidgetSelected(m_formWindow->mainContainer()))
        state = active ? Internal::SelectionHandleActive :  Internal::SelectionHandleInactive;

    m_formResizer->setState(state);
}

QWidget *WidgetHost::integrationContainer() const
{
    return m_formResizer;
}