qtoolbutton.cpp

奇趣公司比较新的qt/emd版本

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#include "qtoolbutton.h"
#ifndef QT_NO_TOOLBUTTON

#include <qapplication.h>
#include <qdesktopwidget.h>
#include <qdrawutil.h>
#include <qevent.h>
#include <qicon.h>
#include <qmenu.h>
#include <qpainter.h>
#include <qpointer.h>
#include <qstyle.h>
#include <qstyleoption.h>
#include <qtooltip.h>
#include <qmainwindow.h>
#include <qtoolbar.h>
#include <qvariant.h>
#include <qstylepainter.h>
#include <private/qabstractbutton_p.h>
#include <private/qaction_p.h>
#include <private/qmenu_p.h>

class QToolButtonPrivate : public QAbstractButtonPrivate
{
    Q_DECLARE_PUBLIC(QToolButton)
public:
    void init();
#ifndef QT_NO_MENU
    void _q_buttonPressed();
    void popupTimerDone();
    void _q_updateButtonDown();
#endif
    void _q_actionTriggered();
    QPointer<QAction> menuAction; //the menu set by the user (setMenu)
    QBasicTimer popupTimer;
    int delay;
    Qt::ArrowType arrowType;
    Qt::ToolButtonStyle toolButtonStyle;
    QToolButton::ToolButtonPopupMode popupMode;
    enum { NoButtonPressed=0, MenuButtonPressed=1, ToolButtonPressed=2 };
    uint buttonPressed : 2;
    uint menuButtonDown          : 1;
    uint autoRaise             : 1;
    uint repeat                : 1;
    QAction *defaultAction;
#ifndef QT_NO_MENU
    bool hasMenu() const;
#endif
#ifdef QT3_SUPPORT
    bool userDefinedPopupDelay;
#endif
};

#ifndef QT_NO_MENU
bool QToolButtonPrivate::hasMenu() const
{
    Q_Q(const QToolButton);
    return ((defaultAction && defaultAction->menu())
            || (menuAction && menuAction->menu())
            || q->actions().size() > (defaultAction ? 1 : 0));
}
#endif

/*!
    \class QToolButton qtoolbutton.h
    \brief The QToolButton class provides a quick-access button to
    commands or options, usually used inside a QToolBar.

    \ingroup basicwidgets
    \mainclass

    A tool button is a special button that provides quick-access to
    specific commands or options. As opposed to a normal command
    button, a tool button usually doesn't show a text label, but shows
    an icon instead.

    Tool buttons are normally created when new QAction instances are
    created with QToolBar::addAction() or existing actions are added
    to a toolbar with QToolBar::addAction(). It is also possible to
    construct tool buttons in the same way as any other widget, and
    arrange them alongside other widgets in layouts.

    One classic use of a tool button is to select tools; for example,
    the "pen" tool in a drawing program. This would be implemented
    by using a QToolButton as a toggle button (see setToggleButton()).

    QToolButton supports auto-raising. In auto-raise mode, the button
    draws a 3D frame only when the mouse points at it. The feature is
    automatically turned on when a button is used inside a QToolBar.
    Change it with setAutoRaise().

    A tool button's icon is set as QIcon. This makes it possible to
    specify different pixmaps for the disabled and active state. The
    disabled pixmap is used when the button's functionality is not
    available. The active pixmap is displayed when the button is
    auto-raised because the mouse pointer is hovering over it.

    The button's look and dimension is adjustable with
    setToolButtonStyle() and setIconSize(). When used inside a
    QToolBar in a QMainWindow, the button automatically adjusts to
    QMainWindow's settings (see QMainWindow::setToolButtonStyle() and
    QMainWindow::setIconSize()). Instead of an icon, a tool button can
    also display an arrow symbol, specified with \l arrowType.

    A tool button can offer additional choices in a popup menu. The
    popup menu can be set using setMenu(). Use setPopupMode() to
    configure the different modes available for tool buttons with a
    menu set. The default mode is DelayedPopupMode which is sometimes
    used with the "Back" button in a web browser.  After pressing and
    holding the button down for a while, a menu pops up showing a list
    of possible pages to jump to. The default delay is 600 ms; you can
    adjust it with setPopupDelay().

    \table 100%
    \row \o \inlineimage assistant-toolbar1.png Qt Assistant's toolbar with tool buttons
    \row \o Qt Assistant's toolbar contains tool buttons that are associated
         with actions used in other parts of the main window.
    \endtable

    \sa QPushButton, QToolBar, QMainWindow, QAction,
        {fowler}{GUI Design Handbook: Push Button}
*/

/*!
    \fn void QToolButton::triggered(QAction *action)

    This signal is emitted when the given \a action is triggered.

    The action may also be associated with other parts of the user interface,
    such as menu items and keyboard shortcuts. Sharing actions in this
    way helps make the user interface more consistent and is often less work
    to implement.
*/

/*!
    Constructs an empty tool button with parent \a
    parent.
*/
QToolButton::QToolButton(QWidget * parent)
    : QAbstractButton(*new QToolButtonPrivate, parent)
{
    Q_D(QToolButton);
    d->init();
}

#ifdef QT3_SUPPORT
/*!
    Constructs an empty tool button called \a name, with parent \a
    parent.
*/

QToolButton::QToolButton(QWidget * parent, const char *name)
    : QAbstractButton(*new QToolButtonPrivate, parent)
{
    Q_D(QToolButton);
    setObjectName(QString::fromAscii(name));
    d->init();
}

/*!
    Constructs a tool button called \a name, that is a child of \a
    parent.

    The tool button will display the given \a icon, with its text
    label and tool tip set to \a textLabel and its status bar message
    set to \a statusTip. It will be connected to the \a slot in
    object \a receiver.
*/

QToolButton::QToolButton(const QIcon& icon, const QString &textLabel,
                         const QString& statusTip,
                         QObject * receiver, const char *slot,
                         QWidget * parent, const char *name)
    : QAbstractButton(*new QToolButtonPrivate, parent)
{
    Q_D(QToolButton);
    setObjectName(QString::fromAscii(name));
    d->init();
    setIcon(icon);
    setText(textLabel);
    if (receiver && slot)
        connect(this, SIGNAL(clicked()), receiver, slot);
#ifndef QT_NO_TOOLTIP
    if (!textLabel.isEmpty())
        setToolTip(textLabel);
#endif
#ifndef QT_NO_STATUSTIP
    if (!statusTip.isEmpty())
        setStatusTip(statusTip);
#else
    Q_UNUSED(statusTip);
#endif
}


/*!
    Constructs a tool button as an arrow button. The Qt::ArrowType \a
    type defines the arrow direction. Possible values are
    Qt::LeftArrow, Qt::RightArrow, Qt::UpArrow, and Qt::DownArrow.

    An arrow button has auto-repeat turned on by default.

    The \a parent and \a name arguments are sent to the QWidget
    constructor.
*/
QToolButton::QToolButton(Qt::ArrowType type, QWidget *parent, const char *name)
    : QAbstractButton(*new QToolButtonPrivate, parent)
{
    Q_D(QToolButton);
    setObjectName(QString::fromAscii(name));
    d->init();
    setAutoRepeat(true);
    d->arrowType = type;
}

#endif


/*  Set-up code common to all the constructors */

void QToolButtonPrivate::init()
{
    Q_Q(QToolButton);
    delay = q->style()->styleHint(QStyle::SH_ToolButton_PopupDelay, 0, q);
#ifdef QT3_SUPPORT
    userDefinedPopupDelay = false;
#endif
    defaultAction = 0;
#ifndef QT_NO_TOOLBAR
    if (qobject_cast<QToolBar*>(q->parentWidget()))
        autoRaise = true;
    else
#endif
        autoRaise = false;
    arrowType = Qt::NoArrow;
    menuButtonDown = false;
    popupMode = QToolButton::DelayedPopup;
    buttonPressed = QToolButtonPrivate::NoButtonPressed;

    toolButtonStyle = Qt::ToolButtonIconOnly;

    q->setFocusPolicy(Qt::TabFocus);
    q->setSizePolicy(QSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed,
                                 QSizePolicy::ToolButton));

    QObject::connect(q, SIGNAL(pressed()), q, SLOT(_q_buttonPressed()));

    setLayoutItemMargins(QStyle::SE_ToolButtonLayoutItem);

}

/*!
    Initialize \a option with the values from this QToolButton. This method
    is useful for subclasses when they need a QStyleOptionToolButton, but don't want
    to fill in all the information themselves.

    \sa QStyleOption::initFrom()
*/
void QToolButton::initStyleOption(QStyleOptionToolButton *option) const
{
    if (!option)
        return;

    Q_D(const QToolButton);
    option->initFrom(this);
    bool forceNoText = false;

#ifndef QT_NO_TOOLBAR
    if (parentWidget()) {
#ifdef QT3_SUPPORT
        if (parentWidget()->inherits("Q3ToolBar")) {
            int iconSize = style()->pixelMetric(QStyle::PM_ToolBarIconSize, option, this);
            option->iconSize = d->icon.actualSize(QSize(iconSize, iconSize));
            forceNoText = d->toolButtonStyle == Qt::ToolButtonIconOnly;
        } else
#endif
            if (QToolBar *toolBar = qobject_cast<QToolBar *>(parentWidget())) {
                option->iconSize = toolBar->iconSize();
            } else {
                option->iconSize = iconSize();
            }
    }
#endif // QT_NO_TOOLBAR

    if (!forceNoText)
        option->text = d->text;
    option->icon = d->icon;
    option->arrowType = d->arrowType;
    if (d->down)
        option->state |= QStyle::State_Sunken;
    if (d->checked)
        option->state |= QStyle::State_On;
    if (d->autoRaise)
        option->state |= QStyle::State_AutoRaise;
    if (!d->checked && !d->down)
        option->state |= QStyle::State_Raised;

    option->subControls = QStyle::SC_ToolButton;
    option->activeSubControls = QStyle::SC_None;
//     if (d->down && !d->menuButtonDown)
//         option->activeSubControls |= QStyle::SC_ToolButton;

    option->features = QStyleOptionToolButton::None;
    if (d->popupMode == QToolButton::MenuButtonPopup) {
        option->subControls |= QStyle::SC_ToolButtonMenu;
        option->features |= QStyleOptionToolButton::MenuButtonPopup;
        if (d->menuButtonDown || d->down) {
            option->state |= QStyle::State_MouseOver;
            option->activeSubControls |= QStyle::SC_ToolButtonMenu;
        }
    } else {
        if (d->menuButtonDown)
            option->state  |= QStyle::State_Sunken;
    }
    if (d->arrowType != Qt::NoArrow)
        option->features |= QStyleOptionToolButton::Arrow;
    if (d->popupMode == QToolButton::DelayedPopup)
        option->features |= QStyleOptionToolButton::PopupDelay;
#ifndef QT_NO_MENU
    if (d->hasMenu())
        option->features |= QStyleOptionToolButton::HasMenu;
#endif
    option->toolButtonStyle = d->toolButtonStyle;
    if (d->icon.isNull() && d->arrowType == Qt::NoArrow && !forceNoText) {
        if (!d->text.isEmpty())
            option->toolButtonStyle = Qt::ToolButtonTextOnly;
        else if (option->toolButtonStyle != Qt::ToolButtonTextOnly)
            option->toolButtonStyle = Qt::ToolButtonIconOnly;
    } else {
        if (d->text.isEmpty() && option->toolButtonStyle != Qt::ToolButtonIconOnly)
            option->toolButtonStyle = Qt::ToolButtonIconOnly;
    }

    option->pos = pos();
    option->font = font();
}

/*!
    Destroys the object and frees any allocated resources.
*/

QToolButton::~QToolButton()
{
}

/*!
    \reimp
*/
QSize QToolButton::sizeHint() const
{
    Q_D(const QToolButton);
    if (d->sizeHint.isValid())
        return d->sizeHint;
    ensurePolished();