qevent.cpp

奇趣公司比较新的qt/emd版本

    When this event occurs it is customary to show a QMenu with a
    context menu, if this is relevant to the context.

    Context menu events contain a special accept flag that indicates
    whether the receiver accepted the event. If the event handler does
    not accept the event then, if possible, whatever triggered the event will be
    handled as a regular input event.
*/

/*!
    Constructs a context menu event object with the accept parameter
    flag set to false.

    The \a reason parameter must be QContextMenuEvent::Mouse or
    QContextMenuEvent::Keyboard.

    The \a pos parameter specifies the mouse position relative to the
    receiving widget. \a globalPos is the mouse position in absolute
    coordinates.
*/
QContextMenuEvent::QContextMenuEvent(Reason reason, const QPoint &pos, const QPoint &globalPos)
    : QInputEvent(ContextMenu), p(pos), gp(globalPos), reas(reason)
{}

#ifdef QT3_SUPPORT
/*!
    Constructs a context menu event with the given \a reason for the
    position specified by \a pos in widget coordinates and \a globalPos
    in global screen coordinates. \a dummy is ignored.
*/
QContextMenuEvent::QContextMenuEvent(Reason reason, const QPoint &pos, const QPoint &globalPos,
                                     int /* dummy */)
    : QInputEvent(ContextMenu), p(pos), gp(globalPos), reas(reason)
{}
#endif

/*! \internal */
QContextMenuEvent::~QContextMenuEvent()
{
}
/*!
    Constructs a context menu event object with the accept parameter
    flag set to false.

    The \a reason parameter must be QContextMenuEvent::Mouse or
    QContextMenuEvent::Keyboard.

    The \a pos parameter specifies the mouse position relative to the
    receiving widget.

    The globalPos() is initialized to QCursor::pos(), which may not be
    appropriate. Use the other constructor to specify the global
    position explicitly.
*/
QContextMenuEvent::QContextMenuEvent(Reason reason, const QPoint &pos)
    : QInputEvent(ContextMenu), p(pos), reas(reason)
{
    gp = QCursor::pos();
}

#ifdef QT3_SUPPORT
/*!
    Constructs a context menu event with the given \a reason for the
    position specified by \a pos in widget coordinates. \a dummy is
    ignored.
*/
QContextMenuEvent::QContextMenuEvent(Reason reason, const QPoint &pos, int /* dummy */)
    : QInputEvent(ContextMenu), p(pos), reas(reason)
{
    gp = QCursor::pos();
}

Qt::ButtonState QContextMenuEvent::state() const
{
    return Qt::ButtonState(int(QApplication::keyboardModifiers())|QApplication::mouseButtons());
}
#endif

/*!
    \fn const QPoint &QContextMenuEvent::pos() const

    Returns the position of the mouse pointer relative to the widget
    that received the event.

    \sa x(), y(), globalPos()
*/

/*!
    \fn int QContextMenuEvent::x() const

    Returns the x position of the mouse pointer, relative to the
    widget that received the event.

    \sa y(), pos()
*/

/*!
    \fn int QContextMenuEvent::y() const

    Returns the y position of the mouse pointer, relative to the
    widget that received the event.

    \sa x(), pos()
*/

/*!
    \fn const QPoint &QContextMenuEvent::globalPos() const

    Returns the global position of the mouse pointer at the time of
    the event.

    \sa x(), y(), pos()
*/

/*!
    \fn int QContextMenuEvent::globalX() const

    Returns the global x position of the mouse pointer at the time of
    the event.

    \sa globalY(), globalPos()
*/

/*!
    \fn int QContextMenuEvent::globalY() const

    Returns the global y position of the mouse pointer at the time of
    the event.

    \sa globalX(), globalPos()
*/

/*!
    \fn Qt::ButtonState QContextMenuEvent::state() const

    Returns the button state (a combination of mouse buttons
    and keyboard modifiers) immediately before the event was
    generated.

    The returned value is a selection of the following values,
    combined with the OR operator:
    Qt::LeftButton, Qt::RightButton, Qt::MidButton,
    Qt::ShiftButton, Qt::ControlButton, and Qt::AltButton.
*/

/*!
    \enum QContextMenuEvent::Reason

    This enum describes the reason why the event was sent.

    \value Mouse The mouse caused the event to be sent. Normally this
    means the right mouse button was clicked, but this is platform
    dependent.

    \value Keyboard The keyboard caused this event to be sent. On
    Windows, this means the menu button was pressed.

    \value Other The event was sent by some other means (i.e. not by
    the mouse or keyboard).
*/


/*!
    \fn QContextMenuEvent::Reason QContextMenuEvent::reason() const

    Returns the reason for this context event.
*/


/*!
    \class QInputMethodEvent
    \brief The QInputMethodEvent class provides parameters for input method events.

    \ingroup events

    Input method events are sent to widgets when an input method is
    used to enter text into a widget. Input methods are widely used
    to enter text for languages with non-Latin alphabets.

    Note that when creating custom text editing widgets, the
    Qt::WA_InputMethodEnabled window attribute must be set explicitly
    (using the QWidget::setAttribute() function) in order to receive
    input method events.

    The events are of interest to authors of keyboard entry widgets
    who want to be able to correctly handle languages with complex
    character input. Text input in such languages is usually a three
    step process:

    \list 1
    \o \bold{Starting to Compose}

       When the user presses the first key on a keyboard, an input
       context is created. This input context will contain a string
       of the typed characters.

    \o \bold{Composing}

       With every new key pressed, the input method will try to create a
       matching string for the text typed so far called preedit
       string. While the input context is active, the user can only move
       the cursor inside the string belonging to this input context.

    \o \bold{Completing}

       At some point, the user will activate a user interface component
       (perhaps using a particular key) where they can choose from a
       number of strings matching the text they have typed so far. The
       user can either confirm their choice cancel the input; in either
       case the input context will be closed.
    \endlist

    QInputMethodEvent models these three stages, and transfers the
    information needed to correctly render the intermediate result. A
    QInputMethodEvent has two main parameters: preeditString() and
    commitString(). The preeditString() parameter gives the currently
    active preedit string. The commitString() parameter gives a text
    that should get added to (or replace parts of) the text of the
    editor widget. It usually is a result of the input operations and
    has to be inserted to the widgets text directly before the preedit
    string.

    If the commitString() should replace parts of the of the text in
    the editor, replacementLength() will contain the number of
    characters to be replaced. replacementStart() contains the position
    at which characters are to be replaced relative from the start of
    the preedit string.

    A number of attributes control the visual appearance of the
    preedit string (the visual appearance of text outside the preedit
    string is controlled by the widget only). The AttributeType enum
    describes the different attributes that can be set.

    A class implementing QWidget::inputMethodEvent() should at least
    understand and honor the \l TextFormat and \l Cursor attributes.

    Since input methods need to be able to query certain properties
    from the widget, the widget must also implement
    QWidget::inputMethodQuery().

    When receiving an input method event, the text widget has to performs the
    following steps:

    \list 1
    \o If the widget has selected text, the selected text should get
       removed.

    \o Remove the text starting at replacementStart() with length
       replacementLength() and replace it by the commitString(). If
       replacementLength() is 0, replacementStart() gives the insertion
       position for the commitString().

       When doing replacement the area of the preedit
       string is ignored, thus a replacement starting at -1 with a length
       of 2 will remove the last character before the preedit string and
       the first character afterwards, and insert the commit string
       directly before the preedit string.

       If the widget implements undo/redo, this operation gets added to
       the undo stack.

    \o If there is no current preedit string, insert the
       preeditString() at the current cursor position; otherwise replace
       the previous preeditString with the one received from this event.

       If the widget implements undo/redo, the preeditString() should not
       influence the undo/redo stack in any way.

       The widget should examine the list of attributes to apply to the
       preedit string. It has to understand at least the TextFormat and
       Cursor attributes and render them as specified.
    \endlist

    \sa QInputContext
*/

/*!
    \enum QInputMethodEvent::AttributeType

    \value TextFormat
    A QTextCharFormat for the part of the preedit string specified by
    start and length. value contains a QVariant of type QTextFormat
    specifying rendering of this part of the preedit string. There
    should be at most one format for every part of the preedit
    string. If several are specified for any character in the string the
    behaviour is undefined. A conforming implementation has to at least
    honor the backgroundColor, textColor and fontUnderline properties
    of the format.

    \value Cursor If set, a cursor should be shown inside the preedit
    string at position start. The length variable determines whether
    the cursor is visible or not. If the length is 0 the cursor is
    invisible. If value is a QVariant of type QColor this color will
    be used for rendering the cursor, otherwise the color of the
    surrounding text will be used. There should be at most one Cursor
    attribute per event. If several are specified the behaviour is
    undefined.

    \value Language
    The variant contains a QLocale object specifying the language of a
    certain part of the preedit string. There should be at most one
    language set for every part of the preedit string. If several are
    specified for any character in the string the behaviour is undefined.

    \value Ruby
    The ruby text for a part of the preedit string. There should be at
    most one ruby text set for every part of the preedit string. If
    several are specified for any character in the string the behaviour
    is undefined.

    \sa Attribute
*/

/*!
    \class QInputMethodEvent::Attribute
    \brief The QInputMethodEvent::Attribute class stores an input method attribute.
*/

/*!
    \fn QInputMethodEvent::Attribute::Attribute(AttributeType type, int start, int length, QVariant value)

    Constructs an input method attribute. \a type specifies the type
    of attribute, \a start and \a length the position of the
    attribute, and \a value the value of the attribute.
*/

/*!
    Constructs an event of type QEvent::InputMethod. The
    attributes(), preeditString(), commitString(), replacementStart(),
    and replacementLength() are initialized to default values.

    \sa setCommitString()
*/
QInputMethodEvent::QInputMethodEvent()
    : QEvent(QEvent::InputMethod), replace_from(0), replace_length(0)
{
}

/*!
    Construcs an event of type QEvent::InputMethod. The
    preedit text is set to \a preeditText, the attributes to
    \a attributes.

    The commitString(), replacementStart(), and replacementLength()
    values can be set using setCommitString().

    \sa preeditString(), attributes()
*/
QInputMethodEvent::QInputMethodEvent(const QString &preeditText, const QList<Attribute> &attributes)
    : QEvent(QEvent::InputMethod), preedit(preeditText), attrs(attributes),
      replace_from(0), replace_length(0)
{
}

/*!
    Constructs a copy of \a other.
*/
QInputMethodEvent::QInputMethodEvent(const QInputMethodEvent &other)
    : QEvent(QEvent::InputMethod), preedit(other.preedit), attrs(other.attrs),
      commit(other.commit), replace_from(other.replace_from), replace_length(other.replace_length)
{
}

/*!
    Sets the commit string to \a commitString.

    The commit string is the text that should get added to (or
    replace parts of) the text of the editor widget. It usually is a
    result of the input operations and has to be inserted to the
    widgets text directly before the preedit string.

    If the commit string should replace parts of the of the text in
    the editor, \a replaceLength specifies the number of
    characters to be replaced. \a replaceFrom specifies the position
    at which characters are to be replaced relative from the start of
    the preedit string.

    \sa commitString(), replacementStart(), replacementLength()
*/
void QInputMethodEvent::setCommitString(const QString &commitString, int replaceFrom, int replaceLength)
{
    commit = commitString;
    replace_from = replaceFrom;
    replace_length = replaceLength;
}

/*!
    \fn const QList<Attribute> &QInputMethodEvent::attributes() const

    Returns the list of attributes passed to the QInputMethodEvent
    constructor. The attributes control the visual appearance of the
    preedit string (the visual appearance of text outside the preedit
    string is controlled by the widget only).

    \sa preeditString(), Attribute
*/

/*!
    \fn const QString &QInputMethodEvent::preeditString() const

    Returns the preedit text, i.e. the text before the user started
    editing it.

    \sa commitString(), attributes()
*/

/*!
    \fn const QString &QInputMethodEvent::commitString() const

    Returns the text that should get added to (or replace parts of)
    the text of the editor widget. It usually is a result of the
    input operations and has to be inserted to the widgets text
    directly before the preedit string.

    \sa setCommitString(), preeditString(), replacementStart(), replacementLength()
*/

/*!
    \fn int QInputMethodEvent::replacementStart() const

    Returns the position at which characters are to be replaced relative
    from the start of the preedit string.

    \sa replacementLength(), setCommitString()
*/

/*!