/****************************************************************************

**

** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (qt-info@nokia.com)

**

** This file is part of the Qt3Support module of the Qt Toolkit.

**

** $QT_BEGIN_LICENSE:LGPL$

** No Commercial Usage

** This file contains pre-release code and may not be distributed.

** You may use this file in accordance with the terms and conditions

** contained in the Technology Preview License Agreement accompanying

** this package.

**

** GNU Lesser General Public License Usage

** Alternatively, this file may be used under the terms of the GNU Lesser

** General Public License version 2.1 as published by the Free Software

** Foundation and appearing in the file LICENSE.LGPL included in the

** packaging of this file.  Please review the following information to

** ensure the GNU Lesser General Public License version 2.1 requirements

** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

**

** In addition, as a special exception, Nokia gives you certain additional

** rights.  These rights are described in the Nokia Qt LGPL Exception

** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

**

** If you have questions regarding the use of this file, please contact

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** $QT_END_LICENSE$

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****************************************************************************/

#include "qplatformdefs.h"

#ifndef QT_NO_TITLEBAR

#include "qapplication.h"

#include "qcursor.h"

#include "qdatetime.h"

#include "qevent.h"

#include "qimage.h"

#include "qpainter.h"

#include "qiodevice.h"

#include "qpixmap.h"

#include "qstyle.h"

#include "qstyleoption.h"

#include "qtimer.h"

#include "qtooltip.h"

#include "qdebug.h"

#if defined(Q_WS_WIN)

#include "qt_windows.h"

#endif

#include "private/qapplication_p.h"

#include "private/q3titlebar_p.h"

#include "private/qwidget_p.h"

QT_BEGIN_NAMESPACE

class Q3TitleBarPrivate : public QWidgetPrivate

{

    Q_DECLARE_PUBLIC(Q3TitleBar)

public:

    Q3TitleBarPrivate()

        : toolTip(0), act(0), window(0), movable(1), pressed(0), autoraise(0), inevent(0)

    {

    }

    Qt::WindowFlags flags;

    QStyle::SubControl buttonDown;

    QPoint moveOffset;

    QToolTip *toolTip;

    bool act                    :1;

    QWidget* window;

    bool movable            :1;

    bool pressed            :1;

    bool autoraise          :1;

    bool inevent : 1;

    int titleBarState() const;

    QStyleOptionTitleBar getStyleOption() const;

    void readColors();

};

inline int Q3TitleBarPrivate::titleBarState() const

{

    uint state = window ? window->windowState() : static_cast<Qt::WindowStates>(Qt::WindowNoState);

    state |= uint(act ? QStyle::State_Active : QStyle::State_None);

    return (int)state;

}

QStyleOptionTitleBar Q3TitleBarPrivate::getStyleOption() const

{

    Q_Q(const Q3TitleBar);

    QStyleOptionTitleBar opt;

    opt.init(q);

    opt.text = q->windowTitle();

    //################

    QIcon icon = q->windowIcon();

    QSize s = icon.actualSize(QSize(64, 64));

    opt.icon = icon.pixmap(s);

    opt.subControls = QStyle::SC_All;

    opt.activeSubControls = QStyle::SC_None;

    opt.titleBarState = titleBarState();

    opt.titleBarFlags = flags;

    return opt;

}

Q3TitleBar::Q3TitleBar(QWidget *w, QWidget *parent, Qt::WindowFlags f)

    : QWidget(*new Q3TitleBarPrivate, parent, Qt::WStyle_Customize | Qt::WStyle_NoBorder)

{

    Q_D(Q3TitleBar);

    if (f == 0 && w)

        f = w->windowFlags();

    d->flags = f;

    d->window = w;

    d->buttonDown = QStyle::SC_None;

    d->act = 0;

    if (w) {

        if (w->minimumSize() == w->maximumSize())

            d->flags &= ~Qt::WindowMaximizeButtonHint;

        setWindowTitle(w->windowTitle());

    }

    d->readColors();

    setSizePolicy(QSizePolicy(QSizePolicy::Expanding, QSizePolicy::Fixed));

    setMouseTracking(true);

    setAutoRaise(style()->styleHint(QStyle::SH_TitleBar_AutoRaise, 0, this));

}

void Q3TitleBar::setFakeWindowFlags(Qt::WindowFlags f)

{

    Q_D(Q3TitleBar);

    d->flags = f;

}

Qt::WindowFlags Q3TitleBar::fakeWindowFlags() const

{

    Q_D(const Q3TitleBar);

    return d->flags;

}

Q3TitleBar::~Q3TitleBar()

{

}

QStyleOptionTitleBar Q3TitleBar::getStyleOption() const

{

    return d_func()->getStyleOption();

}

#ifdef Q_WS_WIN

static inline QRgb colorref2qrgb(COLORREF col)

{

    return qRgb(GetRValue(col),GetGValue(col),GetBValue(col));

}

#endif

void Q3TitleBarPrivate::readColors()

{

    Q_Q(Q3TitleBar);

    QPalette pal = q->palette();

    bool colorsInitialized = false;

#ifdef Q_WS_WIN // ask system properties on windows

    if (QApplication::desktopSettingsAware()) {

        pal.setColor(QPalette::Active, QPalette::Highlight, colorref2qrgb(GetSysColor(COLOR_ACTIVECAPTION)));

        pal.setColor(QPalette::Inactive, QPalette::Highlight, colorref2qrgb(GetSysColor(COLOR_INACTIVECAPTION)));

        pal.setColor(QPalette::Active, QPalette::HighlightedText, colorref2qrgb(GetSysColor(COLOR_CAPTIONTEXT)));

        pal.setColor(QPalette::Inactive, QPalette::HighlightedText, colorref2qrgb(GetSysColor(COLOR_INACTIVECAPTIONTEXT)));

        colorsInitialized = true;

        BOOL gradient = false;

        SystemParametersInfo(SPI_GETGRADIENTCAPTIONS, 0, &gradient, 0);

        if (gradient) {

            pal.setColor(QPalette::Active, QPalette::Base, colorref2qrgb(GetSysColor(COLOR_GRADIENTACTIVECAPTION)));

            pal.setColor(QPalette::Inactive, QPalette::Base, colorref2qrgb(GetSysColor(COLOR_GRADIENTINACTIVECAPTION)));

        } else {

            pal.setColor(QPalette::Active, QPalette::Base, pal.color(QPalette::Active, QPalette::Highlight));

            pal.setColor(QPalette::Inactive, QPalette::Base, pal.color(QPalette::Inactive, QPalette::Highlight));

        }

    }

#endif // Q_WS_WIN

    if (!colorsInitialized) {

        pal.setColor(QPalette::Active, QPalette::Highlight,

                      pal.color(QPalette::Active, QPalette::Highlight));

        pal.setColor(QPalette::Active, QPalette::Base,

                      pal.color(QPalette::Active, QPalette::Highlight));

        pal.setColor(QPalette::Inactive, QPalette::Highlight,

                      pal.color(QPalette::Inactive, QPalette::Dark));

        pal.setColor(QPalette::Inactive, QPalette::Base,

                      pal.color(QPalette::Inactive, QPalette::Dark));

        pal.setColor(QPalette::Inactive, QPalette::HighlightedText,

                      pal.color(QPalette::Inactive, QPalette::Window));

    }

    q->setPalette(pal);

    q->setActive(act);

}

void Q3TitleBar::changeEvent(QEvent *ev)

{

    if(ev->type() == QEvent::ModifiedChange)

        update();

    QWidget::changeEvent(ev);

}

void Q3TitleBar::mousePressEvent(QMouseEvent *e)

{

    Q_D(Q3TitleBar);

    if (!d->act)

        emit doActivate();

    if (e->button() == Qt::LeftButton) {

        d->pressed = true;

        QStyleOptionTitleBar opt = d->getStyleOption();

        QStyle::SubControl ctrl = style()->hitTestComplexControl(QStyle::CC_TitleBar, &opt,

                                                                 e->pos(), this);

        switch (ctrl) {

        case QStyle::SC_TitleBarSysMenu:

            if (d->flags & Qt::WindowSystemMenuHint) {

                d->buttonDown = QStyle::SC_None;

                static QTime *t = 0;

                static Q3TitleBar *tc = 0;

                if (!t)

                    t = new QTime;

                if (tc != this || t->elapsed() > QApplication::doubleClickInterval()) {

                    emit showOperationMenu();

                    t->start();

                    tc = this;

                } else {

                    tc = 0;

                    emit doClose();

                    return;

                }

            }

            break;

        case QStyle::SC_TitleBarShadeButton:

        case QStyle::SC_TitleBarUnshadeButton:

            if (d->flags & Qt::WindowShadeButtonHint)

                d->buttonDown = ctrl;

            break;

        case QStyle::SC_TitleBarNormalButton:

            if (d->flags & Qt::WindowMinMaxButtonsHint)

                d->buttonDown = ctrl;

            break;

        case QStyle::SC_TitleBarMinButton:

            if (d->flags & Qt::WindowMinimizeButtonHint)

                d->buttonDown = ctrl;

            break;

        case QStyle::SC_TitleBarMaxButton:

            if (d->flags & Qt::WindowMaximizeButtonHint)

                d->buttonDown = ctrl;

            break;

        case QStyle::SC_TitleBarCloseButton:

            if (d->flags & Qt::WindowSystemMenuHint)

                d->buttonDown = ctrl;

            break;

        case QStyle::SC_TitleBarLabel:

            d->buttonDown = ctrl;

            d->moveOffset = mapToParent(e->pos());

            break;

        default:

            break;

        }

        repaint();

    } else {

        d->pressed = false;

    }

}

void Q3TitleBar::contextMenuEvent(QContextMenuEvent *e)

{

    Q_D(Q3TitleBar);

    QStyleOptionTitleBar opt = d->getStyleOption();

    QStyle::SubControl ctrl = style()->hitTestComplexControl(QStyle::CC_TitleBar, &opt, e->pos(),

                                                             this);

    if(ctrl == QStyle::SC_TitleBarLabel || ctrl == QStyle::SC_TitleBarSysMenu) {

        e->accept();

        emit popupOperationMenu(e->globalPos());

    } else {

        e->ignore();

    }

}

void Q3TitleBar::mouseReleaseEvent(QMouseEvent *e)

{

    Q_D(Q3TitleBar);

    if (e->button() == Qt::LeftButton && d->pressed) {

        e->accept();

        QStyleOptionTitleBar opt = d->getStyleOption();

        QStyle::SubControl ctrl = style()->hitTestComplexControl(QStyle::CC_TitleBar, &opt,

                                                                 e->pos(), this);

        d->pressed = false;

        if (ctrl == d->buttonDown) {

            d->buttonDown = QStyle::SC_None;

            repaint();

            switch(ctrl) {

            case QStyle::SC_TitleBarShadeButton:

            case QStyle::SC_TitleBarUnshadeButton:

                if(d->flags & Qt::WindowShadeButtonHint)

                    emit doShade();

                break;

            case QStyle::SC_TitleBarNormalButton:

                if(d->flags & Qt::WindowMaximizeButtonHint)

                    emit doNormal();

                break;

            case QStyle::SC_TitleBarMinButton:

                if(d->flags & Qt::WindowMinimizeButtonHint) {

                    if (d->window && d->window->isMinimized())

                        emit doNormal();

                    else

                        emit doMinimize();

                }

                break;

            case QStyle::SC_TitleBarMaxButton:

                if(d->flags & Qt::WindowMaximizeButtonHint) {

                    if(d->window && d->window->isMaximized())

                        emit doNormal();

                    else

                        emit doMaximize();

                }

                break;

            case QStyle::SC_TitleBarCloseButton:

                if(d->flags & Qt::WindowSystemMenuHint) {

                    d->buttonDown = QStyle::SC_None;

                    repaint();

                    emit doClose();

                    return;

                }

                break;

            default:

                break;

            }

        }

    } else {

        e->ignore();

    }

}

void Q3TitleBar::mouseMoveEvent(QMouseEvent *e)

{

    Q_D(Q3TitleBar);

    e->accept();

    switch (d->buttonDown) {

    case QStyle::SC_None:

        if(autoRaise())

            repaint();

        break;

    case QStyle::SC_TitleBarSysMenu:

        break;

    case QStyle::SC_TitleBarShadeButton:

    case QStyle::SC_TitleBarUnshadeButton:

    case QStyle::SC_TitleBarNormalButton:

    case QStyle::SC_TitleBarMinButton:

    case QStyle::SC_TitleBarMaxButton:

    case QStyle::SC_TitleBarCloseButton:

        {

            QStyle::SubControl last_ctrl = d->buttonDown;

            QStyleOptionTitleBar opt = d->getStyleOption();

            d->buttonDown = style()->hitTestComplexControl(QStyle::CC_TitleBar, &opt, e->pos(), this);

            if (d->buttonDown != last_ctrl)

                d->buttonDown = QStyle::SC_None;

            repaint();

            d->buttonDown = last_ctrl;

        }

        break;

    case QStyle::SC_TitleBarLabel:

        if (d->buttonDown == QStyle::SC_TitleBarLabel && d->movable && d->pressed) {

            if ((d->moveOffset - mapToParent(e->pos())).manhattanLength() >= 4) {

                QPoint p = mapFromGlobal(e->globalPos());

                QWidget *parent = d->window ? d->window->parentWidget() : 0;

                if(parent && parent->inherits("Q3WorkspaceChild")) {

                    QWidget *workspace = parent->parentWidget();

                    p = workspace->mapFromGlobal(e->globalPos());

                    if (!workspace->rect().contains(p)) {

                        if (p.x() < 0)

                            p.rx() = 0;

                        if (p.y() < 0)

                            p.ry() = 0;

                        if (p.x() > workspace->width())

                            p.rx() = workspace->width();

                        if (p.y() > workspace->height())

                            p.ry() = workspace->height();

                    }

                }

                QPoint pp = p - d->moveOffset;

                if (!parentWidget()->isMaximized())

                    parentWidget()->move(pp);

            }

        } else {

            QStyle::SubControl last_ctrl = d->buttonDown;

            d->buttonDown = QStyle::SC_None;

            if(d->buttonDown != last_ctrl)

                repaint();

        }

        break;

    default:

        break;

    }

}

void Q3TitleBar::resizeEvent(QResizeEvent *r)

{

    QWidget::resizeEvent(r);

    cutText();

}

bool Q3TitleBar::isTool() const

{

    return (d_func()->flags & Qt::WindowType_Mask) == Qt::Tool;

}

void Q3TitleBar::paintEvent(QPaintEvent *)

{

    Q_D(Q3TitleBar);

    QStyleOptionTitleBar opt = d->getStyleOption();

    opt.subControls = QStyle::SC_TitleBarLabel;

    opt.activeSubControls = d->buttonDown;

    if (d->flags & Qt::WindowSystemMenuHint) {

        opt.subControls |= QStyle::SC_TitleBarSysMenu | QStyle::SC_TitleBarCloseButton;

        if (d->window && (d->flags & Qt::WindowShadeButtonHint)) {

            if (d->window->isMinimized())

                opt.subControls |= QStyle::SC_TitleBarUnshadeButton;

            else

                opt.subControls |= QStyle::SC_TitleBarShadeButton;

        }

        if (d->window && (d->flags & Qt::WindowMinMaxButtonsHint)) {

            if(d->window && d->window->isMinimized())

                opt.subControls |= QStyle::SC_TitleBarNormalButton;

            else

                opt.subControls |= QStyle::SC_TitleBarMinButton;

        }

        if (d->window && (d->flags & Qt::WindowMaximizeButtonHint) && !d->window->isMaximized())

            opt.subControls |= QStyle::SC_TitleBarMaxButton;

    }

    QStyle::SubControl under_mouse = QStyle::SC_None;

    if (underMouse()) {

        under_mouse = style()->hitTestComplexControl(QStyle::CC_TitleBar, &opt,

                                                     mapFromGlobal(QCursor::pos()), this);

        opt.activeSubControls |= under_mouse;

        if (d->pressed)

            opt.state |= QStyle::State_Sunken;

        else if(autoRaise())

            opt.state |= QStyle::State_MouseOver;

    }

    opt.palette.setCurrentColorGroup(usesActiveColor() ? QPalette::Active : QPalette::Inactive);

    QPainter p(this);

    if (!windowTitle().isEmpty())

        opt.titleBarFlags |= Qt::WindowTitleHint;

    style()->drawComplexControl(QStyle::CC_TitleBar, &opt, &p, this);

}

void Q3TitleBar::mouseDoubleClickEvent(QMouseEvent *e)

{

    Q_D(Q3TitleBar);

    if (e->button() != Qt::LeftButton) {

        e->ignore();

        return;

    }

    e->accept();

    QStyleOptionTitleBar opt = d->getStyleOption();

    switch (style()->hitTestComplexControl(QStyle::CC_TitleBar, &opt, e->pos(), this)) {

    case QStyle::SC_TitleBarLabel:

        emit doubleClicked();

        break;

    case QStyle::SC_TitleBarSysMenu:

        if (d->flags & Qt::WStyle_SysMenu)

            emit doClose();

        break;

    default:

        break;

    }

}

void Q3TitleBar::cutText()

{

    Q_D(Q3TitleBar);

    QFontMetrics fm(font());

    QStyleOptionTitleBar opt = d->getStyleOption();

    int maxw = style()->subControlRect(QStyle::CC_TitleBar, &opt, QStyle::SC_TitleBarLabel,

                                       this).width();

    if (!d->window)

        return;

    QString txt = d->window->windowTitle();

    if (style()->styleHint(QStyle::SH_TitleBar_ModifyNotification, 0, this) && d->window

        && d->window->isWindowModified())

        txt += QLatin1String(" *");

    QString cuttext = txt;

    if (fm.width(txt + QLatin1Char('m')) > maxw) {

        int i = txt.length();

        int dotlength = fm.width(QLatin1String("..."));

        while (i>0 && fm.width(txt.left(i)) + dotlength > maxw)

            i--;

        if(i != (int)txt.length())

            cuttext = txt.left(i) + QLatin1String("...");

    }