qpeapplication_menulike.cpp

Trolltech公司发布的图形界面操作系统。可在qt-embedded-2.3.10平台上编译为嵌入式图形界面操作系统。

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/*!
  If \a b is true sets the dialog \a diag to have Menu Like behaviour when executed.
  Otherwise sets dialog to have default dialog behaviour.

  Menu Like dialogs typically have a single list of options, and
  should accept the dialog when the select key is pressed on the appropriate item,
  and when a mouse/stylus is used to click on an item - just like menus.
  Menu Like dialogs should only have one widget accepting key focus.
  
  By marking a dialog as Menu Like Qtopia will map the Back key to reject the dialog
  and will not map any key to accept the dialog - you must do that yourself.

  The default dialog behaviour is to include a cancel menu option in the context
  menu to reject the dialog and to map the Back key to accept the dialog.

  Only modal dialogs can be Menu Like.

  \sa isMenuLike()
*/
void QPEApplication::setMenuLike( QDialog *diag, bool b )
{
    if (b == isMenuLike(diag))
	return;

    if (!diag->testWFlags(WType_Modal)) {
	qWarning("Cannot setMenuLike for non-modal dialog: %s (%s)",
	    diag->className(), diag->name() ? diag->name() : "unnamed");
	return;
    }

#ifdef QTOPIA_PHONE
    // can't do here, if QDialog is const..... but it doesn't need to be.
    if (b)
	ContextBar::setLabel(diag, Qt::Key_Back, ContextBar::Cancel);
    else
	ContextBar::setLabel(diag, Qt::Key_Back, ContextBar::Back);

    if (qpeWidgetFlags.contains(diag)) {
	qpeWidgetFlags[diag] = qpeWidgetFlags[diag] ^ MenuLikeDialog;
    } else {
	// the ternery below is actually null.  if b is false, and flags
	// not present, then will never get here, hence b is always
	// true at this point.  Leave in though incase that logic
	// changes.
	qpeWidgetFlags.insert(diag, b ? MenuLikeDialog : 0);
	// connect to destructed signal.
	connect(diag, SIGNAL(destroyed()), qApp, SLOT(removeFromWidgetFlags()));
    }
#endif
}

/*!
  Returns true if the dialog \a diag is set to have Menu Like behaviour when executed.
  Otherwise returns FALSE

  \sa setMenuLike()
*/
bool QPEApplication::isMenuLike( const QDialog *diag)
{
#ifdef QTOPIA_PHONE
    if (qpeWidgetFlags.contains(diag))
	return (qpeWidgetFlags[diag] & MenuLikeDialog == MenuLikeDialog);
#else
    Q_UNUSED(diag); 
#endif
    return FALSE; // default.
}