qwindowsstyle.cpp

qt-x11-opensource-src-4.1.4.tar.gz源码

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**
** Copyright (C) 1992-2006 Trolltech ASA. All rights reserved.
**
** This file is part of the QtGui module of the Qt Toolkit.
**
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** License version 2.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of
** this file.  Please review the following information to ensure GNU
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**
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** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
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****************************************************************************/

#include "qwindowsstyle.h"
#include "qwindowsstyle_p.h"

#if !defined(QT_NO_STYLE_WINDOWS) || defined(QT_PLUGIN)

#include "qapplication.h"
#include "qbitmap.h"
#include "qdockwidget.h"
#include "qdrawutil.h" // for now
#include "qevent.h"
#include "qmenu.h"
#include "qmenubar.h"
#include "qpaintengine.h"
#include "qpainter.h"
#include "qprogressbar.h"
#include "qrubberband.h"
#include "qstyleoption.h"
#include "qtabbar.h"
#include "qwidget.h"
#include "qdebug.h"
#include "qmainwindow.h"

#if defined(Q_WS_WIN)
#include "qt_windows.h"
#  ifndef COLOR_GRADIENTACTIVECAPTION
#    define COLOR_GRADIENTACTIVECAPTION     27
#  endif
#  ifndef COLOR_GRADIENTINACTIVECAPTION
#    define COLOR_GRADIENTINACTIVECAPTION   28
#  endif
#endif

#include <limits.h>

static const int windowsItemFrame        =  2; // menu item frame width
static const int windowsSepHeight        =  9; // separator item height
static const int windowsItemHMargin      =  3; // menu item hor text margin
static const int windowsItemVMargin      =  2; // menu item ver text margin
static const int windowsArrowHMargin	 =  6; // arrow horizontal margin
static const int windowsTabSpacing	 = 12; // space between text and tab
static const int windowsCheckMarkHMargin =  2; // horiz. margins of check mark
static const int windowsRightBorder      = 15; // right border on windows
static const int windowsCheckMarkWidth   = 12; // checkmarks width on windows

static bool use2000style = true;

enum QSliderDirection { SlUp, SlDown, SlLeft, SlRight };

/*
    \internal
*/
QWindowsStylePrivate::QWindowsStylePrivate()
    : alt_down(false), menuBarTimer(0), animationFps(10), animateTimer(0), animateStep(0)
{
}

// Returns true if the toplevel parent of \a widget has seen the Alt-key
bool QWindowsStylePrivate::hasSeenAlt(const QWidget *widget) const
{
    widget = widget->window();
    return seenAlt.contains(widget);
}

/*!
    \reimp
*/
void QWindowsStyle::timerEvent(QTimerEvent *event)
{
#ifndef QT_NO_PROGRESSBAR
    Q_D(QWindowsStyle);
    if (event->timerId() == d->animateTimer) {
        Q_ASSERT(d->animationFps> 0);
        d->animateStep = d->startTime.elapsed() / (1000 / d->animationFps);
        foreach (QProgressBar *bar, d->bars) {
            if ((bar->minimum() == 0 && bar->maximum() == 0))
                bar->update();
        }
    }
#endif // QT_NO_PROGRESSBAR
    event->ignore();
}

/*!
    \reimp
*/
bool QWindowsStyle::eventFilter(QObject *o, QEvent *e)
{
    // Records Alt- and Focus events
    if (!o->isWidgetType())
        return QObject::eventFilter(o, e);

    QWidget *widget = ::qobject_cast<QWidget*>(o);
    Q_D(QWindowsStyle);
    switch(e->type()) {
    case QEvent::KeyPress:
        if (static_cast<QKeyEvent *>(e)->key() == Qt::Key_Alt) {
            widget = widget->window();

            // Alt has been pressed - find all widgets that care
            QList<QWidget *> l = qFindChildren<QWidget *>(widget);
            for (int pos=0 ; pos < l.size() ; ++pos) {
                QWidget *w = l.at(pos);
                if (w->isWindow() || !w->isVisible() ||
                    w->style()->styleHint(SH_UnderlineShortcut, 0, w))
                    l.removeAt(pos);
            }
            // Update states before repainting
            d->seenAlt.append(widget);
            d->alt_down = true;

            // Repaint all relevant widgets
            for (int pos = 0; pos < l.size(); ++pos)
                l.at(pos)->update();
        }
        break;
    case QEvent::KeyRelease:
	if (static_cast<QKeyEvent*>(e)->key() == Qt::Key_Alt) {
	    widget = widget->window();

	    // Update state and repaint the menubars.
	    d->alt_down = false;
#ifndef QT_NO_MENUBAR
            QList<QMenuBar *> l = qFindChildren<QMenuBar *>(widget);
            for (int i = 0; i < l.size(); ++i)
                l.at(i)->update();
#endif
	}
	break;
    case QEvent::Close:
        // Reset widget when closing
        d->seenAlt.removeAll(widget);
        d->seenAlt.removeAll(widget->window());
        break;
#ifndef QT_NO_PROGRESSBAR
    case QEvent::StyleChange:
    case QEvent::Show:
        if (QProgressBar *bar = qobject_cast<QProgressBar *>(o)) {
            d->bars << bar;
            if (d->bars.size() == 1) {
                Q_ASSERT(d->animationFps> 0);
                d->animateTimer = startTimer(1000 / d->animationFps);
            }
        }
        break;
    case QEvent::Destroy:
        d->bars.removeAll(reinterpret_cast<QProgressBar *>(o));
        break;
    case QEvent::Hide:
        if (QProgressBar *bar = qobject_cast<QProgressBar *>(o)) {
            d->bars.removeAll(bar);
            if (d->bars.isEmpty()) {
                killTimer(d->animateTimer);
                d->animateTimer = 0;
            }
        }
        break;
#endif // QT_NO_PROGRESSBAR
    default:
        break;
    }
    return QCommonStyle::eventFilter(o, e);
}

/*!
    \class QWindowsStyle qwindowsstyle.h
    \brief The QWindowsStyle class provides a Microsoft Windows-like look and feel.

    \ingroup appearance

    This style is Qt's default GUI style on Windows.

    \img qwindowsstyle.png
    \sa QWindowsXPStyle, QMacStyle, QPlastiqueStyle, QCDEStyle, QMotifStyle
*/

/*!
    Constructs a QWindowsStyle object.
*/
QWindowsStyle::QWindowsStyle() : QCommonStyle(*new QWindowsStylePrivate)
{
#if defined(Q_OS_WIN32)
    use2000style = QSysInfo::WindowsVersion != QSysInfo::WV_NT && QSysInfo::WindowsVersion != QSysInfo::WV_95;
#endif
}

/*!
    \internal

    Constructs a QWindowsStyle object.
*/
QWindowsStyle::QWindowsStyle(QWindowsStylePrivate &dd) : QCommonStyle(dd)
{
#if defined(Q_OS_WIN32)
    use2000style = QSysInfo::WindowsVersion != QSysInfo::WV_NT && QSysInfo::WindowsVersion != QSysInfo::WV_95;
#endif
}


/*! Destroys the QWindowsStyle object. */
QWindowsStyle::~QWindowsStyle()
{
}

#ifdef Q_WS_WIN
static inline QRgb colorref2qrgb(COLORREF col)
{
    return qRgb(GetRValue(col), GetGValue(col), GetBValue(col));
}
#endif

/*! \reimp */
void QWindowsStyle::polish(QApplication *app)
{
    QWindowsStylePrivate *d = const_cast<QWindowsStylePrivate*>(d_func());
    // We only need the overhead when shortcuts are sometimes hidden
    if (!styleHint(SH_UnderlineShortcut, 0) && app)
        app->installEventFilter(this);

    d->activeCaptionColor = app->palette().highlight().color();
    d->activeGradientCaptionColor = app->palette().highlight() .color();
    d->inactiveCaptionColor = app->palette().dark().color();
    d->inactiveGradientCaptionColor = app->palette().dark().color();
    d->inactiveCaptionText = app->palette().background().color();

#if defined(Q_WS_WIN) //fetch native titlebar colors
    if(app->desktopSettingsAware()){
        DWORD activeCaption = GetSysColor(COLOR_ACTIVECAPTION);
        DWORD gradientActiveCaption = GetSysColor(COLOR_GRADIENTACTIVECAPTION);
        DWORD inactiveCaption = GetSysColor(COLOR_INACTIVECAPTION);
        DWORD gradientInactiveCaption = GetSysColor(COLOR_GRADIENTINACTIVECAPTION);
        DWORD inactiveCaptionText = GetSysColor(COLOR_INACTIVECAPTIONTEXT);
        d->activeCaptionColor = colorref2qrgb(activeCaption);
        d->activeGradientCaptionColor = colorref2qrgb(gradientActiveCaption);
        d->inactiveCaptionColor = colorref2qrgb(inactiveCaption);
        d->inactiveGradientCaptionColor = colorref2qrgb(gradientInactiveCaption);
        d->inactiveCaptionText = colorref2qrgb(inactiveCaptionText);
    }
#endif
}

/*! \reimp */
void QWindowsStyle::unpolish(QApplication *app)
{
    app->removeEventFilter(this);
}

/*! \reimp */
void QWindowsStyle::polish(QWidget *widget)
{
    QCommonStyle::polish(widget);
#ifndef QT_NO_PROGRESSBAR
    if (qobject_cast<QProgressBar *>(widget))
        widget->installEventFilter(this);
#endif
}

/*! \reimp */
void QWindowsStyle::unpolish(QWidget *widget)
{
    QCommonStyle::unpolish(widget);
#ifndef QT_NO_PROGRESSBAR
    if (qobject_cast<QProgressBar *>(widget))
        widget->removeEventFilter(this);
#endif
}

/*! \reimp */
void QWindowsStyle::polish(QPalette &pal)
{
    QCommonStyle::polish(pal);
}

/*!
  \reimp
*/
int QWindowsStyle::pixelMetric(PixelMetric pm, const QStyleOption *opt, const QWidget *widget) const
{
    int ret;

    switch (pm) {
    case PM_ButtonDefaultIndicator:
    case PM_ButtonShiftHorizontal:
    case PM_ButtonShiftVertical:
        ret = 1;
        break;
#ifndef QT_NO_TABBAR
    case PM_TabBarTabShiftHorizontal:
        ret = 0;
        break;
    case PM_TabBarTabShiftVertical:
        ret = 2;
        break;
#endif
    case PM_MaximumDragDistance:
        ret = 60;
        break;

#ifndef QT_NO_SLIDER
    case PM_SliderLength:
        ret = 11;
        break;

        // Returns the number of pixels to use for the business part of the
        // slider (i.e., the non-tickmark portion). The remaining space is shared
        // equally between the tickmark regions.
    case PM_SliderControlThickness:
        if (const QStyleOptionSlider *sl = qstyleoption_cast<const QStyleOptionSlider *>(opt)) {
            int space = (sl->orientation == Qt::Horizontal) ? sl->rect.height() : sl->rect.width();
            int ticks = sl->tickPosition;
            int n = 0;
            if (ticks & QSlider::TicksAbove)
                ++n;
            if (ticks & QSlider::TicksBelow)
                ++n;
            if (!n) {
                ret = space;
                break;
            }

            int thick = 6;        // Magic constant to get 5 + 16 + 5
            if (ticks != QSlider::TicksBothSides && ticks != QSlider::NoTicks)
                thick += pixelMetric(PM_SliderLength, sl, widget) / 4;

            space -= thick;
            if (space > 0)
                thick += (space * 2) / (n + 2);
            ret = thick;
        } else {
            ret = 0;
        }
        break;
#endif // QT_NO_SLIDER

#ifndef QT_NO_MENU
    case PM_MenuBarHMargin:
        ret = 0;
        break;

    case PM_MenuBarVMargin:
        ret = 0;
        break;

    case PM_MenuBarPanelWidth:
        ret = 0;
        break;

    case PM_SmallIconSize:
        ret = 16;
        break;

    case PM_LargeIconSize:
        ret = 32;
        break;

    case PM_IconViewIconSize:
        ret = pixelMetric(PM_LargeIconSize, opt, widget);
        break;

    case PM_ToolBarIconSize:
        ret = 24;
        break;
    case PM_DockWidgetTitleMargin: