org.kde.qt
Class QWorkspace

java.lang.Object
  extended by org.kde.qt.Qt
      extended by org.kde.qt.QObject
          extended by org.kde.qt.QWidget
              extended by org.kde.qt.QWorkspace
All Implemented Interfaces:
QPaintDeviceInterface, QtSupport

public class QWorkspace
extends QWidget

See QWorkspaceSignals for signals emitted by QWorkspace


Field Summary
static int CreationOrder
           
static int StackingOrder
           
 
Fields inherited from class org.kde.qt.QWidget
AncestorOrigin, ClickFocus, NoFocus, ParentOrigin, StrongFocus, TabFocus, WheelFocus, WidgetOrigin, WindowOrigin
 
Fields inherited from class org.kde.qt.Qt
AlignAuto, AlignBottom, AlignCenter, AlignHCenter, AlignHorizontal_Mask, AlignJustify, AlignLeft, AlignRight, AlignTop, AlignVCenter, AlignVertical_Mask, AlphaDither_Mask, ALT, AltButton, AnchorHref, AnchorName, AndNotROP, AndROP, ArrowCursor, Ascending, ASCII_ACCEL, AutoColor, AutoDither, AutoText, AvoidDither, BDiagPattern, BeginsWith, BevelJoin, BitmapCursor, BlankCursor, Bottom, BottomLeft, BottomRight, BreakAnywhere, BusyCursor, CaseSensitive, ClearROP, ColorMode_Mask, ColorOnly, Contains, ControlButton, CopyROP, CrossCursor, CrossPattern, CTRL, CustomPattern, DashDotDotLine, DashDotLine, DashLine, Dense1Pattern, Dense2Pattern, Dense3Pattern, Dense4Pattern, Dense5Pattern, Dense6Pattern, Dense7Pattern, Descending, DiagCrossPattern, DiffuseAlphaDither, DiffuseDither, Dither_Mask, DitherMode_Mask, DockBottom, DockLeft, DockMinimized, DockRight, DockTop, DockTornOff, DockUnmanaged, DontClip, DontPrint, DotLine, DownArrow, EndsWith, EraseROP, ExactMatch, ExpandTabs, FDiagPattern, FixedColor, FixedPixmap, FlatCap, ForbiddenCursor, HiEnglishUnit, HiMetricUnit, Horizontal, HorPattern, IbeamCursor, Identical, IncludeTrailingSpaces, ISODate, Key_0, Key_1, Key_2, Key_3, Key_4, Key_5, Key_6, Key_7, Key_8, Key_9, Key_A, Key_aacute, Key_Aacute, Key_acircumflex, Key_Acircumflex, Key_acute, Key_adiaeresis, Key_Adiaeresis, Key_ae, Key_AE, Key_agrave, Key_Agrave, Key_Alt, Key_Ampersand, Key_Any, Key_Apostrophe, Key_aring, Key_Aring, Key_AsciiCircum, Key_AsciiTilde, Key_Asterisk, Key_At, Key_atilde, Key_Atilde, Key_B, Key_Back, Key_Backslash, Key_Backspace, Key_BackSpace, Key_Backtab, Key_BackTab, Key_Bar, Key_BassBoost, Key_BassDown, Key_BassUp, Key_BraceLeft, Key_BraceRight, Key_BracketLeft, Key_BracketRight, Key_brokenbar, Key_C, Key_CapsLock, Key_ccedilla, Key_Ccedilla, Key_cedilla, Key_cent, Key_Clear, Key_Colon, Key_Comma, Key_Control, Key_copyright, Key_currency, Key_D, Key_degree, Key_Delete, Key_diaeresis, Key_Direction_L, Key_Direction_R, Key_division, Key_Dollar, Key_Down, Key_E, Key_eacute, Key_Eacute, Key_ecircumflex, Key_Ecircumflex, Key_ediaeresis, Key_Ediaeresis, Key_egrave, Key_Egrave, Key_End, Key_Enter, Key_Equal, Key_Escape, Key_eth, Key_ETH, Key_Exclam, Key_exclamdown, Key_F, Key_F1, Key_F10, Key_F11, Key_F12, Key_F13, Key_F14, Key_F15, Key_F16, Key_F17, Key_F18, Key_F19, Key_F2, Key_F20, Key_F21, Key_F22, Key_F23, Key_F24, Key_F25, Key_F26, Key_F27, Key_F28, Key_F29, Key_F3, Key_F30, Key_F31, Key_F32, Key_F33, Key_F34, Key_F35, Key_F4, Key_F5, Key_F6, Key_F7, Key_F8, Key_F9, Key_Favorites, Key_Forward, Key_G, Key_Greater, Key_guillemotleft, Key_guillemotright, Key_H, Key_Help, Key_Home, Key_HomePage, Key_Hyper_L, Key_Hyper_R, Key_hyphen, Key_I, Key_iacute, Key_Iacute, Key_icircumflex, Key_Icircumflex, Key_idiaeresis, Key_Idiaeresis, Key_igrave, Key_Igrave, Key_Insert, Key_J, Key_K, Key_L, Key_Launch0, Key_Launch1, Key_Launch2, Key_Launch3, Key_Launch4, Key_Launch5, Key_Launch6, Key_Launch7, Key_Launch8, Key_Launch9, Key_LaunchA, Key_LaunchB, Key_LaunchC, Key_LaunchD, Key_LaunchE, Key_LaunchF, Key_LaunchMail, Key_LaunchMedia, Key_Left, Key_Less, Key_M, Key_macron, Key_masculine, Key_MediaLast, Key_MediaNext, Key_MediaPlay, Key_MediaPrev, Key_MediaRecord, Key_MediaStop, Key_Menu, Key_Meta, Key_Minus, Key_mu, Key_multiply, Key_N, Key_Next, Key_nobreakspace, Key_notsign, Key_ntilde, Key_Ntilde, Key_NumberSign, Key_NumLock, Key_O, Key_oacute, Key_Oacute, Key_ocircumflex, Key_Ocircumflex, Key_odiaeresis, Key_Odiaeresis, Key_ograve, Key_Ograve, Key_onehalf, Key_onequarter, Key_onesuperior, Key_Ooblique, Key_OpenUrl, Key_ordfeminine, Key_oslash, Key_otilde, Key_Otilde, Key_P, Key_PageDown, Key_PageUp, Key_paragraph, Key_ParenLeft, Key_ParenRight, Key_Pause, Key_Percent, Key_Period, Key_periodcentered, Key_Plus, Key_plusminus, Key_Print, Key_Prior, Key_Q, Key_Question, Key_questiondown, Key_QuoteDbl, Key_QuoteLeft, Key_R, Key_Refresh, Key_registered, Key_Return, Key_Right, Key_S, Key_ScrollLock, Key_Search, Key_section, Key_Semicolon, Key_Shift, Key_Slash, Key_Space, Key_ssharp, Key_Standby, Key_sterling, Key_Stop, Key_Super_L, Key_Super_R, Key_SysReq, Key_T, Key_Tab, Key_thorn, Key_THORN, Key_threequarters, Key_threesuperior, Key_TrebleDown, Key_TrebleUp, Key_twosuperior, Key_U, Key_uacute, Key_Uacute, Key_ucircumflex, Key_Ucircumflex, Key_udiaeresis, Key_Udiaeresis, Key_ugrave, Key_Ugrave, Key_Underscore, Key_unknown, Key_Up, Key_V, Key_VolumeDown, Key_VolumeMute, Key_VolumeUp, Key_W, Key_X, Key_Y, Key_yacute, Key_Yacute, Key_ydiaeresis, Key_yen, Key_Z, KeyButtonMask, Keypad, LastCursor, LastROP, Left, LeftArrow, LeftButton, LocalDate, LocalTime, LoEnglishUnit, LogText, LoMetricUnit, MacStyle, META, MetaButton, MidButton, Minimized, MiterJoin, MODIFIER_MASK, MonoOnly, MotifStyle, MouseButtonMask, MPenCapStyle, MPenJoinStyle, MPenStyle, MV_10_DOT_0, MV_10_DOT_1, MV_10_DOT_2, MV_10_DOT_3, MV_10_DOT_4, MV_9, MV_CHEETAH, MV_JAGUAR, MV_PANTHER, MV_PUMA, MV_TIGER, MV_Unknown, NandROP, NoAccel, NoAlpha, NoBackground, NoBrush, NoButton, NoMatch, NoPen, NopROP, NorROP, NotAndROP, NotCopyROP, NotEraseROP, NotOrROP, NotROP, NotXorROP, OpaqueMode, OrderedAlphaDither, OrderedDither, OrNotROP, OrROP, Overline, PaletteBackground, PaletteBase, PaletteBrightText, PaletteButton, PaletteButtonText, PaletteDark, PaletteForeground, PaletteHighlight, PaletteHighlightedText, PaletteLight, PaletteLink, PaletteLinkVisited, PaletteMid, PaletteMidlight, PaletteShadow, PaletteText, PartialMatch, PixelUnit, PlainText, PMStyle, PointingHandCursor, PreferDither, RichText, Right, RightArrow, RightButton, RoundCap, RoundJoin, SetROP, SHIFT, ShiftButton, ShowPrefix, SingleLine, SizeAllCursor, SizeBDiagCursor, SizeFDiagCursor, SizeHorCursor, SizeVerCursor, SolidLine, SolidPattern, SplitHCursor, SplitVCursor, SquareCap, StrikeOut, TextDate, ThresholdAlphaDither, ThresholdDither, Top, TopLeft, TopRight, TornOff, TransparentMode, TwipsUnit, UI_AnimateCombo, UI_AnimateMenu, UI_AnimateToolBox, UI_AnimateTooltip, UI_FadeMenu, UI_FadeTooltip, UI_General, Underline, UNICODE_ACCEL, Unmanaged, UpArrow, UpArrowCursor, UTC, VerPattern, Vertical, WaitCursor, WDestructiveClose, WGroupLeader, WhatsThisCursor, Win3Style, WindowActive, WindowFullScreen, WindowMaximized, WindowMinimized, WindowNoState, WindowsStyle, WMacDrawer, WMacNoSheet, WMouseNoMask, WNoAutoErase, WNoMousePropagation, WNorthWestGravity, WordBreak, WPaintClever, WPaintDesktop, WPaintUnclipped, WRepaintNoErase, WResizeNoErase, WShowModal, WState_AutoMask, WState_BlockUpdates, WState_CompressKeys, WState_ConfigPending, WState_Created, WState_CreatedHidden, WState_Disabled, WState_DND, WState_Exposed, WState_ForceDisabled, WState_ForceHide, WState_FullScreen, WState_HasMouse, WState_InPaintEvent, WState_Maximized, WState_Minimized, WState_MouseTracking, WState_OwnCursor, WState_OwnSizePolicy, WState_Polished, WState_Reparented, WState_Reserved0, WState_Resized, WState_Visible, WStaticContents, WStyle_ContextHelp, WStyle_Customize, WStyle_Dialog, WStyle_DialogBorder, WStyle_Mask, WStyle_Maximize, WStyle_Minimize, WStyle_MinMax, WStyle_NoBorder, WStyle_NoBorderEx, WStyle_NormalBorder, WStyle_Reserved, WStyle_Splash, WStyle_StaysOnTop, WStyle_SysMenu, WStyle_Title, WStyle_Tool, WSubWindow, WType_Desktop, WType_Dialog, WType_Mask, WType_Modal, WType_Popup, WType_TopLevel, WV_2000, WV_2003, WV_32s, WV_95, WV_98, WV_CE, WV_CE_based, WV_CENET, WV_DOS_based, WV_Me, WV_NT, WV_NT_based, WV_XP, WWinOwnDC, WX11BypassWM, X11ParentRelative, XorROP
 
Constructor Summary
  QWorkspace()
           
protected QWorkspace(java.lang.Class dummy)
           
  QWorkspace(QWidget parent)
           
  QWorkspace(QWidget parent, java.lang.String name)
           
 
Method Summary
 void activateNextWindow()
           
 void activatePrevWindow()
           
 QWidget activeWindow()
           
 void cascade()
           
protected  void childEvent(QChildEvent arg1)
           
 java.lang.String className()
           
 void closeActiveWindow()
           
 void closeAllWindows()
           
 void dispose()
          Delete the wrapped C++ instance ahead of finalize()
 boolean eventFilter(QObject arg1, QEvent arg2)
           
protected  void finalize()
          Deletes the wrapped C++ instance
protected  void hideEvent(QHideEvent e)
           
 boolean isDisposed()
          Has the wrapped C++ instance been deleted?
 QMetaObject metaObject()
           
protected  void resizeEvent(QResizeEvent arg1)
           
 boolean scrollBarsEnabled()
           
 void setPaletteBackgroundColor(QColor arg1)
           
 void setPaletteBackgroundPixmap(QPixmap arg1)
           
 void setScrollBarsEnabled(boolean enable)
           
 void showEvent(QShowEvent e)
           
 QSize sizeHint()
           
 void styleChange(QStyle arg1)
           
 void tile()
           
static java.lang.String tr(java.lang.String arg1)
           
static java.lang.String tr(java.lang.String arg1, java.lang.String arg2)
           
protected  void wheelEvent(QWheelEvent e)
           
 java.util.ArrayList windowList()
           
 java.util.ArrayList windowList(int order)
           
 
Methods inherited from class org.kde.qt.QWidget
acceptDrops, adjustSize, autoMask, backgroundBrush, backgroundColor, backgroundMode, backgroundOffset, backgroundOrigin, backgroundPixmap, baseSize, caption, childAt, childAt, childAt, childAt, childrenRect, childrenRegion, clearFocus, clearMask, clearWFlags, clearWState, clipRegion, close, close, closeEvent, colorGroup, constPolish, contextMenuEvent, create, create, create, create, cursor, customWhatsThis, destroy, destroy, destroy, devType, dragEnterEvent, dragLeaveEvent, dragMoveEvent, drawText, drawText, dropEvent, enabledChange, enterEvent, erase, erase, erase, erase, eraseColor, erasePixmap, event, find, focusData, focusInEvent, focusNextPrevChild, focusOutEvent, focusPolicy, focusProxy, focusWidget, font, fontChange, fontInf, fontInfo, fontMet, fontMet, fontMet, fontMetrics, foregroundColor, frameGeometry, frameSize, geometry, getWFlags, getWState, grabKeyboard, grabMouse, grabMouse, hasFocus, hasMouse, hasMouseTracking, height, heightForWidth, hide, icon, iconify, iconText, imComposeEvent, imEndEvent, imStartEvent, isActiveWindow, isDesktop, isDialog, isEnabled, isEnabledTo, isEnabledToTLW, isExtDev, isFocusEnabled, isFullScreen, isHidden, isInputMethodEnabled, isMaximized, isMinimized, isModal, isPopup, isShown, isTopLevel, isUpdatesEnabled, isVisible, isVisibleTo, isVisibleToTLW, keyboardGrabber, keyPressEvent, keyReleaseEvent, layout, leaveEvent, lower, mapFrom, mapFromGlobal, mapFromParent, mapTo, mapToGlobal, mapToParent, maximumHeight, maximumSize, maximumWidth, metric, microFocusHint, minimumHeight, minimumSize, minimumSizeHint, minimumWidth, mouseDoubleClickEvent, mouseGrabber, mouseMoveEvent, mousePressEvent, mouseReleaseEvent, move, move, moveEvent, ownCursor, ownFont, ownPalette, paintDevice, paintEvent, paintingActive, palette, paletteBackgroundColor, paletteBackgroundPixmap, paletteChange, paletteForegroundColor, parentWidget, parentWidget, polish, pos, raise, recreate, recreate, rect, releaseKeyboard, releaseMouse, repaint, repaint, repaint, repaint, repaint, repaint, repaint, repaint, reparent, reparent, reparent, reparent, resetInputContext, resize, resize, resolution, scroll, scroll, setAcceptDrops, setActiveWindow, setAutoMask, setBackgroundColor, setBackgroundMode, setBackgroundMode, setBackgroundOrigin, setBackgroundPixmap, setBaseSize, setBaseSize, setCaption, setCursor, setDisabled, setEnabled, setEraseColor, setErasePixmap, setFixedHeight, setFixedSize, setFixedSize, setFixedWidth, setFocus, setFocusPolicy, setFocusProxy, setFont, setFont, setGeometry, setGeometry, setHidden, setIcon, setIconText, setInputMethodEnabled, setKeyCompression, setMask, setMask, setMaximumHeight, setMaximumSize, setMaximumSize, setMaximumWidth, setMicroFocusHint, setMicroFocusHint, setMicroFocusHint, setMinimumHeight, setMinimumSize, setMinimumSize, setMinimumWidth, setMouseTracking, setName, setPalette, setPalette, setPaletteForegroundColor, setResolution, setShown, setSizeIncrement, setSizeIncrement, setSizePolicy, setSizePolicy, setSizePolicy, setStyle, setStyle, setTabOrder, setUpdatesEnabled, setWFlags, setWindowOpacity, setWindowState, setWState, show, showFullScreen, showMaximized, showMinimized, showNormal, size, sizeIncrement, sizePolicy, stackUnder, style, tabletEvent, testWFlags, testWState, topLevelWidget, unsetCursor, unsetFont, unsetPalette, update, update, update, updateGeometry, updateMask, visibleRect, width, windowActivationChange, windowOpacity, windowState, winId, x, y
 
Methods inherited from class org.kde.qt.QObject
activate_filters, activate_signal_bool, activate_signal, activate_signal, activate_signal, activate_signal, blockSignals, checkConnectArgs, child, child, child, children, connect, connect, connectInternal, connectNotify, customEvent, deleteLater, disconnect, disconnect, disconnect, disconnect, disconnect, disconnect, disconnect, disconnectInternal, disconnectNotify, dumpObjectInfo, dumpObjectTree, emit, emit, emit, emit, emit, emit, emit, emit, emit, emit, emit, emit, emit, emit, emit, emit, emit, emit, emit, emit, emit, emit, highPriority, i18n, inherits, insertChild, installEventFilter, isA, isWidgetType, killTimer, killTimers, name, name, normalizeSignalSlot, objectTrees, parent, property, queryList, queryList, queryList, queryList, queryList, registerUserData, removeChild, removeEventFilter, sender, setProperty, signalsBlocked, startTimer, timerEvent
 
Methods inherited from class org.kde.qt.Qt
arrowCursor, bin, bitBlt, bitBlt, bitBlt, bitBlt, bitBlt, bitBlt, bitBlt, bitBlt, bitBlt, bitBlt, bitBlt, bitBlt, bitBlt, bitBlt, bitBlt, bitBlt, bitBlt, bitBlt, bitBlt, bitBlt, bitBlt, bitBlt, bitBlt, black, blankCursor, blue, color0, color1, copyBlt, copyBlt, copyBlt, copyBlt, copyBlt, crossCursor, cyan, darkBlue, darkCyan, darkGray, darkGreen, darkMagenta, darkRed, darkYellow, dec, dynamicCast, endl, flush, forbiddenCursor, fromUtf8, gray, green, hex, ibeamCursor, lightGray, magenta, oct, op_div, op_div, op_div, op_div, op_equals, op_equals, op_equals, op_equals, op_minus, op_minus, op_minus, op_mult, op_mult, op_mult, op_mult, op_mult, op_mult, op_mult, op_mult, op_mult, op_not_equals, op_not_equals, op_not_equals, op_not_equals, op_plus, op_plus, op_read, op_read, op_read, op_read, op_read, op_read, op_read, op_read, op_read, op_read, op_read, op_read, op_read, op_read, op_read, op_read, op_read, op_read, op_read, op_read, op_read, op_read, op_read, op_read, op_read, op_read, op_write, op_write, op_write, op_write, op_write, op_write, op_write, op_write, op_write, op_write, op_write, op_write, op_write, op_write, op_write, op_write, op_write, op_write, op_write, op_write, op_write, op_write, op_write, op_write, op_write, op_write, op_write, pointingHandCursor, qAlpha, qApp, qAppName, qBlue, qCompress, qCompress, qDebug, qDebug, qDrawArrow, qDrawItem, qDrawItem, qDrawItem, qDrawPlainRect, qDrawPlainRect, qDrawPlainRect, qDrawPlainRect, qDrawPlainRect, qDrawPlainRect, qDrawShadeLine, qDrawShadeLine, qDrawShadeLine, qDrawShadeLine, qDrawShadeLine, qDrawShadeLine, qDrawShadeLine, qDrawShadeLine, qDrawShadePanel, qDrawShadePanel, qDrawShadePanel, qDrawShadePanel, qDrawShadePanel, qDrawShadePanel, qDrawShadePanel, qDrawShadePanel, qDrawShadeRect, qDrawShadeRect, qDrawShadeRect, qDrawShadeRect, qDrawShadeRect, qDrawShadeRect, qDrawShadeRect, qDrawShadeRect, qDrawShadeRect, qDrawShadeRect, qDrawWinButton, qDrawWinButton, qDrawWinButton, qDrawWinButton, qDrawWinButton, qDrawWinButton, qDrawWinPanel, qDrawWinPanel, qDrawWinPanel, qDrawWinPanel, qDrawWinPanel, qDrawWinPanel, qFatal, qFatal, qGLVersion, qGray, qGray, qGreen, qInitNetworkProtocols, qInstallPath, qInstallPathBins, qInstallPathData, qInstallPathDocs, qInstallPathHeaders, qInstallPathLibs, qInstallPathPlugins, qInstallPathSysconf, qInstallPathTranslations, qItemRect, qItemRect, qObsolete, qObsolete, qObsolete, qRed, qRgb, qRgba, qRound, qSharedBuild, qSuppressObsoleteWarnings, qSuppressObsoleteWarnings, qSysInfo, qSystemWarning, qSystemWarning, qUncompress, qUncompress, qVersion, qWarning, qWarning, red, reset, SIGNAL, sizeAllCursor, sizeBDiagCursor, sizeFDiagCursor, sizeHorCursor, sizeVerCursor, SLOT, splitHCursor, splitVCursor, upArrowCursor, waitCursor, whatsThisCursor, white, ws, yellow
 
Methods inherited from class java.lang.Object
clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

CreationOrder

public static final int CreationOrder
See Also:
Constant Field Values

StackingOrder

public static final int StackingOrder
See Also:
Constant Field Values
Constructor Detail

QWorkspace

protected QWorkspace(java.lang.Class dummy)

QWorkspace

public QWorkspace(QWidget parent,
                  java.lang.String name)

QWorkspace

public QWorkspace(QWidget parent)

QWorkspace

public QWorkspace()
Method Detail

metaObject

public QMetaObject metaObject()
Overrides:
metaObject in class QWidget

className

public java.lang.String className()
Overrides:
className in class QWidget

activeWindow

public QWidget activeWindow()

windowList

public java.util.ArrayList windowList()

windowList

public java.util.ArrayList windowList(int order)

sizeHint

public QSize sizeHint()
Overrides:
sizeHint in class QWidget

scrollBarsEnabled

public boolean scrollBarsEnabled()

setScrollBarsEnabled

public void setScrollBarsEnabled(boolean enable)

setPaletteBackgroundColor

public void setPaletteBackgroundColor(QColor arg1)
Overrides:
setPaletteBackgroundColor in class QWidget

setPaletteBackgroundPixmap

public void setPaletteBackgroundPixmap(QPixmap arg1)
Overrides:
setPaletteBackgroundPixmap in class QWidget

cascade

public void cascade()

tile

public void tile()

closeActiveWindow

public void closeActiveWindow()

closeAllWindows

public void closeAllWindows()

activateNextWindow

public void activateNextWindow()

activatePrevWindow

public void activatePrevWindow()

tr

public static java.lang.String tr(java.lang.String arg1,
                                  java.lang.String arg2)

tr

public static java.lang.String tr(java.lang.String arg1)

styleChange

public void styleChange(QStyle arg1)
Overrides:
styleChange in class QWidget

childEvent

protected void childEvent(QChildEvent arg1)
Overrides:
childEvent in class QObject

resizeEvent

protected void resizeEvent(QResizeEvent arg1)
Overrides:
resizeEvent in class QWidget

eventFilter

public boolean eventFilter(QObject arg1,
                           QEvent arg2)
Overrides:
eventFilter in class QObject

showEvent

public void showEvent(QShowEvent e)
Overrides:
showEvent in class QWidget

hideEvent

protected void hideEvent(QHideEvent e)
Overrides:
hideEvent in class QWidget

wheelEvent

protected void wheelEvent(QWheelEvent e)
Overrides:
wheelEvent in class QWidget

finalize

protected void finalize()
                 throws java.lang.InternalError
Deletes the wrapped C++ instance

Overrides:
finalize in class QWidget
Throws:
java.lang.InternalError

dispose

public void dispose()
Delete the wrapped C++ instance ahead of finalize()

Overrides:
dispose in class QWidget

isDisposed

public boolean isDisposed()
Has the wrapped C++ instance been deleted?

Overrides:
isDisposed in class QWidget