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## com.trolltech.qt.gui
Class QTabBar

    java.lang.Object
      com.trolltech.qt.internal.QSignalEmitterInternal
          com.trolltech.qt.QSignalEmitter
              com.trolltech.qt.QtJambiObject
                  com.trolltech.qt.core.QObject
                      com.trolltech.qt.gui.QWidget
                          com.trolltech.qt.gui.QTabBar

All Implemented Interfaces:
  QPaintDeviceInterface, QtJambiInterface

    public class QTabBar

extends QWidget

The QTabBar class provides a tab bar, e. . for use in tabbed dialogs. QTabBar is straightforward to use; it draws the tabs using one of the predefined `shapes` , and emits a signal when a tab is selected. It can be subclassed to tailor the look and feel. Qt also provides a ready-made `QTabWidget`.

Each tab has a `tabText()`, an optional `tabIcon()`, an optional `tabToolTip()`, optional `tabWhatsThis()` and optional `tabData()`. The tabs's attributes can be changed with `setTabText()`, `setTabIcon()`, `setTabToolTip()`, setTabWhatsThis and `setTabData()`. Each tabs can be enabled or disabled individually with `setTabEnabled()`.

Each tab can display text in a distinct color. The current text color for a tab can be found with the `tabTextColor()` function. Set the text color for a particular tab with `setTabTextColor()`.

Tabs are added using `addTab()`, or inserted at particular positions using `insertTab()`. The total number of tabs is given by `count()`. Tabs can be removed from the tab bar with `removeTab()`. Combining `removeTab()` and `insertTab()` allows you to move tabs to different positions.

The `shape` property defines the tabs' appearance. The choice of shape is a matter of taste, although tab dialogs (for preferences and similar) invariably use `RoundedNorth` . Tab controls in windows other than dialogs almost always use either `RoundedSouth` or `TriangularSouth` . Many spreadsheets and other tab controls in which all the pages are essentially similar use `TriangularSouth` , whereas `RoundedSouth` is used mostly when the pages are different (e.g. a multi-page tool palette). The default in QTabBar is `RoundedNorth` .

The most important part of QTabBar's API is the `currentChanged()` signal. This is emitted whenever the current tab changes (even at startup, when the current tab changes from 'none'). There is also a slot, `setCurrentIndex()`, which can be used to select a tab programmatically. The function `currentIndex()` returns the index of the current tab, `count` holds the number of tabs.

QTabBar creates automatic mnemonic keys in the manner of `QAbstractButton`; e.g. if a tab's label is "&Graphics", Alt+G becomes a shortcut key for switching to that tab.

The following virtual functions may need to be reimplemented in order to tailor the look and feel or store extra data with each tab:

- `tabSizeHint()` calcuates the size of a tab.
- `tabInserted()` notifies that a new tab was added.
- `tabRemoved()` notifies that a tab was removed.
- `tabLayoutChange()` notifies that the tabs have been re-laid out.
- `paintEvent()` paints all tabs.

For subclasses, you might also need the `tabRect()` functions which returns the visual geometry of a single tab.

| A tab bar shown in the Plastique widget style.
| A truncated tab bar shown in the Plastique widget style.

See also:
  `QTabWidget`.

Nested Class Summary
`static class` | `QTabBar.Shape` This enum type lists the built-in shapes supported by `QTabBar`.

Nested classes/interfaces inherited from class com.trolltech.qt.gui.QWidget
`QWidget.RenderFlag, QWidget.RenderFlags`

Nested classes/interfaces inherited from class com.trolltech.qt.QSignalEmitter
`QSignalEmitter.AbstractSignal, QSignalEmitter.Signal0, QSignalEmitter.Signal1, QSignalEmitter.Signal2, QSignalEmitter.Signal3, QSignalEmitter.Signal4, QSignalEmitter.Signal5, QSignalEmitter.Signal6, QSignalEmitter.Signal7, QSignalEmitter.Signal8, QSignalEmitter.Signal9`

Nested classes/interfaces inherited from class com.trolltech.qt.internal.QSignalEmitterInternal
`com.trolltech.qt.internal.QSignalEmitterInternal.AbstractSignalInternal`

Field Summary
`QSignalEmitter.Signal1` | `currentChanged` This signal takes 1 generic argument(s).

Fields inherited from class com.trolltech.qt.gui.QWidget
`customContextMenuRequested`

Fields inherited from class com.trolltech.qt.internal.QSignalEmitterInternal
`currentSender`

Constructor Summary
`QTabBar()` Creates a new tab bar with the given `parent`.
`QTabBar(QWidget parent)` Creates a new tab bar with the given `parent`.

Method Summary
`int` | `addTab(QIcon icon, java.lang.String text)` Adds a new tab with icon `icon` and text `text`.
`int` | `addTab(java.lang.String text)` Adds a new tab with text `text`.
`int` | `count()` This property holds the number of tabs in the tab bar.
`int` | `currentIndex()` This property holds the index of the tab bar's visible tab.
`boolean` | `drawBase()` This property defines whether or not tab bar should draw its base.
`Qt.TextElideMode` | `elideMode()` This property holds how to elide text in the tab bar.
`QSize` | `iconSize()` This property holds The size for icons in the tab bar.
`void` | `initStyleOption(QStyleOptionTab option, int tabIndex)` Initialize `option` with the values from the tab at `tabIndex`.
`int` | `insertTab(int index, QIcon icon, java.lang.String text)` Inserts a new tab with icon `icon` and text `text` at position `index`.
`int` | `insertTab(int index, java.lang.String text)` Inserts a new tab with text `text` at position `index`.
`boolean` | `isTabEnabled(int index)` Returns true if the tab at position `index` is enabled; otherwise returns false.
`void` | `removeTab(int index)` Removes the tab at position `index`.
`void` | `setCurrentIndex(int index)` This property holds the index of the tab bar's visible tab.
`void` | `setDrawBase(boolean drawTheBase)` This property defines whether or not tab bar should draw its base.
`void` | `setElideMode(Qt.TextElideMode arg__1)` This property holds how to elide text in the tab bar.
`void` | `setIconSize(QSize size)` This property holds The size for icons in the tab bar.
`void` | `setShape(QTabBar.Shape shape)` This property holds the shape of the tabs in the tab bar.
`void` | `setTabData(int index, java.lang.Object data)` Sets the data of the tab at position `index` to `data`.
`void` | `setTabEnabled(int index, boolean arg__2)` If `enabled` is true then the tab at position `index` is enabled; otherwise the item at position `index` is disabled.
`void` | `setTabIcon(int index, QIcon icon)` Sets the icon of the tab at position `index` to `icon`.
`void` | `setTabText(int index, java.lang.String text)` Sets the text of the tab at position `index` to `text`.
`void` | `setTabTextColor(int index, QColor color)` Sets the color of the text in the tab with the given `index` to the specified `color`.
`void` | `setTabToolTip(int index, java.lang.String tip)` Sets the tool tip of the tab at position `index` to `tip`.
`void` | `setTabWhatsThis(int index, java.lang.String text)` Sets the What's This help text of the tab at position `index` to `text`.
`void` | `setUsesScrollButtons(boolean useButtons)` This property holds Whether or not a tab bar should use buttons to scroll tabs when it has many tabs.
`QTabBar.Shape` | `shape()` This property holds the shape of the tabs in the tab bar.
`int` | `tabAt(QPoint pos)` Returns the index of the tab that covers `position` or -1 if no tab covers `position`;
`java.lang.Object` | `tabData(int index)` Returns the datad of the tab at position `index`, or a null variant if `index` is out of range.
`QIcon` | `tabIcon(int index)` Returns the icon of the tab at position `index`, or a null icon if `index` is out of range.
`protected void` | `tabInserted(int index)` This virtual handler is called after a new tab was added or inserted at position `index`.
`protected void` | `tabLayoutChange()` This virtual handler is called whenever the tab layout changes.
`QRect` | `tabRect(int index)` Returns the visual rectangle of the of the tab at position `index`, or a null rectangle if `index` is out of range.
`protected void` | `tabRemoved(int index)` This virtual handler is called after a tab was removed from position `index`.
`protected QSize` | `tabSizeHint(int index)` Returns the size hint for the tab at position `index`.
`java.lang.String` | `tabText(int index)` Returns the text of the tab at position `index`, or an empty string if `index` is out of range.
`QColor` | `tabTextColor(int index)` Returns the text color of the tab with the given `index`, or a invalid color if `index` is out of range.
`java.lang.String` | `tabToolTip(int index)` Returns the tool tip of the tab at position `index`, or an empty string if `index` is out of range.
`java.lang.String` | `tabWhatsThis(int index)` Returns the What's This help text of the tab at position `index`, or an empty string if `index` is out of range.
`boolean` | `usesScrollButtons()` This property holds Whether or not a tab bar should use buttons to scroll tabs when it has many tabs.

Methods inherited from class com.trolltech.qt.gui.QWidget
`acceptDrops, accessibleDescription, accessibleName, actionEvent, actions, activateWindow, addAction, addActions, adjustSize, autoFillBackground, backgroundRole, baseSize, changeEvent, childAt, childAt, childrenRect, childrenRegion, clearFocus, clearMask, close, closeEvent, contentsRect, contextMenuEvent, contextMenuPolicy, cursor, depth, destroy, destroy, destroy, dragEnterEvent, dragLeaveEvent, dragMoveEvent, dropEvent, effectiveWinId, ensurePolished, enterEvent, focusInEvent, focusNextChild, focusNextPrevChild, focusOutEvent, focusPolicy, focusPreviousChild, focusProxy, focusWidget, font, fontInfo, fontMetrics, foregroundRole, frameGeometry, frameSize, geometry, getContentsMargins, grabKeyboard, grabMouse, grabMouse, grabShortcut, grabShortcut, hasFocus, hasMouseTracking, height, heightForWidth, heightMM, hide, hideEvent, inputContext, inputMethodEvent, inputMethodQuery, insertAction, insertActions, isActiveWindow, isAncestorOf, isEnabled, isEnabledTo, isFullScreen, isHidden, isMaximized, isMinimized, isModal, isVisible, isVisibleTo, isWindow, isWindowModified, keyboardGrabber, keyPressEvent, keyReleaseEvent, languageChange, layout, layoutDirection, leaveEvent, locale, logicalDpiX, logicalDpiY, lower, mapFrom, mapFromGlobal, mapFromParent, mapTo, mapToGlobal, mapToParent, mask, maximumHeight, maximumSize, maximumWidth, metric, minimumHeight, minimumSize, minimumSizeHint, minimumWidth, mouseDoubleClickEvent, mouseGrabber, mouseMoveEvent, mousePressEvent, mouseReleaseEvent, move, move, moveEvent, nativeParentWidget, nextInFocusChain, normalGeometry, numColors, overrideWindowFlags, overrideWindowFlags, overrideWindowState, paintEngine, paintEvent, paintingActive, palette, parentWidget, physicalDpiX, physicalDpiY, pos, raise, rect, releaseKeyboard, releaseMouse, releaseShortcut, removeAction, render, render, render, render, render, render, render, render, render, repaint, repaint, repaint, repaint, resetInputContext, resize, resize, resizeEvent, restoreGeometry, saveGeometry, scroll, scroll, setAcceptDrops, setAccessibleDescription, setAccessibleName, setAttribute, setAttribute, setAutoFillBackground, setBackgroundRole, setBaseSize, setBaseSize, setContentsMargins, setContentsMargins, setContextMenuPolicy, setCursor, setDisabled, setEnabled, setFixedHeight, setFixedSize, setFixedSize, setFixedWidth, setFocus, setFocus, setFocusPolicy, setFocusProxy, setFont, setForegroundRole, setGeometry, setGeometry, setHidden, setInputContext, setLayout, setLayoutDirection, setLocale, setMask, setMask, setMaximumHeight, setMaximumSize, setMaximumSize, setMaximumWidth, setMinimumHeight, setMinimumSize, setMinimumSize, setMinimumWidth, setMouseTracking, setPalette, setParent, setParent, setParent, setShortcutAutoRepeat, setShortcutAutoRepeat, setShortcutEnabled, setShortcutEnabled, setSizeIncrement, setSizeIncrement, setSizePolicy, setSizePolicy, setStatusTip, setStyle, setStyleSheet, setTabOrder, setToolTip, setUpdatesEnabled, setVisible, setWhatsThis, setWindowFilePath, setWindowFlags, setWindowFlags, setWindowIcon, setWindowIconText, setWindowModality, setWindowModified, setWindowOpacity, setWindowRole, setWindowState, setWindowState, setWindowTitle, show, showEvent, showFullScreen, showMaximized, showMinimized, showNormal, size, sizeHint, sizeIncrement, sizePolicy, stackUnder, statusTip, style, styleSheet, tabletEvent, testAttribute, toolTip, underMouse, unsetCursor, unsetLayoutDirection, unsetLocale, update, update, update, update, updateGeometry, updateMicroFocus, updatesEnabled, visibleRegion, whatsThis, wheelEvent, width, widthMM, window, windowFilePath, windowFlags, windowIcon, windowIconText, windowModality, windowOpacity, windowRole, windowState, windowTitle, windowType, winId, x, y`

Methods inherited from class com.trolltech.qt.core.QObject
`childEvent, children, connectSlotsByName, customEvent, disposeLater, dumpObjectInfo, dumpObjectTree, dynamicPropertyNames, event, eventFilter, findChild, findChild, findChild, findChildren, findChildren, findChildren, findChildren, indexOfProperty, installEventFilter, isWidgetType, killTimer, moveToThread, objectName, parent, properties, property, removeEventFilter, setObjectName, setParent, setProperty, startTimer, timerEvent, toString, userProperty`

Methods inherited from class com.trolltech.qt.QtJambiObject
`dispose, disposed, equals, finalize, reassignNativeResources, tr, tr, tr`

Methods inherited from class com.trolltech.qt.QSignalEmitter
`blockSignals, disconnect, disconnect, signalsBlocked, signalSender, thread`

Methods inherited from class com.trolltech.qt.internal.QSignalEmitterInternal
`__qt_signalInitialization`

Methods inherited from class java.lang.Object
`clone, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Methods inherited from interface com.trolltech.qt.QtJambiInterface
`disableGarbageCollection, nativeId, nativePointer, reenableGarbageCollection, setJavaOwnership`

Field Detail

### currentChanged

    public final QSignalEmitter.Signal1 currentChanged

  This signal takes 1 generic argument(s). We list their type and the name they go by in the description of this signal. <java.lang.Integer(named: index)>:

  This signal is emitted when the tab bar's current tab changes. The new current has the given `index`, or -1 if there isn't a new one (for example, if there are no tab in the QTabBar)

Constructor Detail

### QTabBar

    public QTabBar()

  Creates a new tab bar with the given `parent`.

### QTabBar

    public QTabBar(QWidget parent)

  Creates a new tab bar with the given `parent`.

Method Detail

### addTab

    public final int addTab(QIcon icon,
                            java.lang.String text)

  Adds a new tab with icon `icon` and text `text`. Returns the new tab's index.

### addTab

    public final int addTab(java.lang.String text)

  Adds a new tab with text `text`. Returns the new tab's index.

### count

    public final int count()

  This property holds the number of tabs in the tab bar.

### currentIndex

    public final int currentIndex()

  This property holds the index of the tab bar's visible tab. The current index is -1 if there is no current tab.

### drawBase

    public final boolean drawBase()

  This property defines whether or not tab bar should draw its base. If true then QTabBar draws a base in relation to the styles overlab. Otherwise only the tabs are drawn.

See also:
  `QStyle::pixelMetric()`, `QStyle::PM_TabBarBaseOverlap` , and `QStyleOptionTabBarBase`.

### elideMode

    public final Qt.TextElideMode elideMode()

  This property holds how to elide text in the tab bar. This property controls how items are elided when there is not enough space to show them for a given tab bar size.

  By default the value is style dependent.

See also:
  `QTabWidget::elideMode`, `usesScrollButtons`, and `QStyle::SH_TabBar_ElideMode` .

### iconSize

    public final QSize iconSize()

  This property holds The size for icons in the tab bar. The default value is style-dependent. `iconSize` is a maximum size; icons that are smaller are not scaled up.

See also:
  `QTabWidget::iconSize`.

### insertTab

    public final int insertTab(int index,
                               QIcon icon,
                               java.lang.String text)

  Inserts a new tab with icon `icon` and text `text` at position `index`. If `index` is out of range, the new tab is appended. Returns the new tab's index.

  If the QTabBar was empty before this function is called, the inserted tab becomes the current tab.

  Inserting a new tab at an index less than or equal to the current index will increment the current index, but keep the current tab.

### insertTab

    public final int insertTab(int index,
                               java.lang.String text)

  Inserts a new tab with text `text` at position `index`. If `index` is out of range, the new tab is appened. Returns the new tab's index.

### isTabEnabled

    public final boolean isTabEnabled(int index)

  Returns true if the tab at position `index` is enabled; otherwise returns false.

### removeTab

    public final void removeTab(int index)

  Removes the tab at position `index`.

### setCurrentIndex

    public final void setCurrentIndex(int index)

  This property holds the index of the tab bar's visible tab. The current index is -1 if there is no current tab.

### setDrawBase

    public final void setDrawBase(boolean drawTheBase)

  This property defines whether or not tab bar should draw its base. If true then QTabBar draws a base in relation to the styles overlab. Otherwise only the tabs are drawn.

See also:
  `QStyle::pixelMetric()`, `QStyle::PM_TabBarBaseOverlap` , and `QStyleOptionTabBarBase`.

### setElideMode

    public final void setElideMode(Qt.TextElideMode arg__1)

  This property holds how to elide text in the tab bar. This property controls how items are elided when there is not enough space to show them for a given tab bar size.

  By default the value is style dependent.

See also:
  `QTabWidget::elideMode`, `usesScrollButtons`, and `QStyle::SH_TabBar_ElideMode` .

### setIconSize

    public final void setIconSize(QSize size)

  This property holds The size for icons in the tab bar. The default value is style-dependent. `iconSize` is a maximum size; icons that are smaller are not scaled up.

See also:
  `QTabWidget::iconSize`.

### setShape

    public final void setShape(QTabBar.Shape shape)

  This property holds the shape of the tabs in the tab bar. Possible values for this property are described by the Shape enum.

### setTabData

    public final void setTabData(int index,
                                 java.lang.Object data)

  Sets the data of the tab at position `index` to `data`.

See also:
  `tabData()`.

### setTabEnabled

    public final void setTabEnabled(int index,
                                    boolean arg__2)

  If `enabled` is true then the tab at position `index` is enabled; otherwise the item at position `index` is disabled.

See also:
  `isTabEnabled()`.

### setTabIcon

    public final void setTabIcon(int index,
                                 QIcon icon)

  Sets the icon of the tab at position `index` to `icon`.

See also:
  `tabIcon()`.

### setTabText

    public final void setTabText(int index,
                                 java.lang.String text)

  Sets the text of the tab at position `index` to `text`.

See also:
  `tabText()`.

### setTabTextColor

    public final void setTabTextColor(int index,
                                      QColor color)

  Sets the color of the text in the tab with the given `index` to the specified `color`.

  If an invalid color is specified, the tab will use the QTabBar foreground role instead.

See also:
  `tabTextColor()`.

### setTabToolTip

    public final void setTabToolTip(int index,
                                    java.lang.String tip)

  Sets the tool tip of the tab at position `index` to `tip`.

See also:
  `tabToolTip()`.

### setTabWhatsThis

    public final void setTabWhatsThis(int index,
                                      java.lang.String text)

  Sets the What's This help text of the tab at position `index` to `text`.

See also:
  `tabWhatsThis()`.

### setUsesScrollButtons

    public final void setUsesScrollButtons(boolean useButtons)

  This property holds Whether or not a tab bar should use buttons to scroll tabs when it has many tabs. When there are too many tabs in a tab bar for its size, the tab bar can either choose to expand its size or to add buttons that allow you to scroll through the tabs.

  By default the value is style dependant.

See also:
  `elideMode`, `QTabWidget::usesScrollButtons`, and `QStyle::SH_TabBar_PreferNoArrows` .

### shape

    public final QTabBar.Shape shape()

  This property holds the shape of the tabs in the tab bar. Possible values for this property are described by the Shape enum.

### tabAt

    public final int tabAt(QPoint pos)

  Returns the index of the tab that covers `position` or -1 if no tab covers `position`;

### tabData

    public final java.lang.Object tabData(int index)

  Returns the datad of the tab at position `index`, or a null variant if `index` is out of range.

See also:
  `setTabData()`.

### tabIcon

    public final QIcon tabIcon(int index)

  Returns the icon of the tab at position `index`, or a null icon if `index` is out of range.

See also:
  `setTabIcon()`.

### tabRect

    public final QRect tabRect(int index)

  Returns the visual rectangle of the of the tab at position `index`, or a null rectangle if `index` is out of range.

### tabText

    public final java.lang.String tabText(int index)

  Returns the text of the tab at position `index`, or an empty string if `index` is out of range.

See also:
  `setTabText()`.

### tabTextColor

    public final QColor tabTextColor(int index)

  Returns the text color of the tab with the given `index`, or a invalid color if `index` is out of range.

See also:
  `setTabTextColor()`.

### tabToolTip

    public final java.lang.String tabToolTip(int index)

  Returns the tool tip of the tab at position `index`, or an empty string if `index` is out of range.

See also:
  `setTabToolTip()`.

### tabWhatsThis

    public final java.lang.String tabWhatsThis(int index)

  Returns the What's This help text of the tab at position `index`, or an empty string if `index` is out of range.

See also:
  `setTabWhatsThis()`.

### usesScrollButtons

    public final boolean usesScrollButtons()

  This property holds Whether or not a tab bar should use buttons to scroll tabs when it has many tabs. When there are too many tabs in a tab bar for its size, the tab bar can either choose to expand its size or to add buttons that allow you to scroll through the tabs.

  By default the value is style dependant.

See also:
  `elideMode`, `QTabWidget::usesScrollButtons`, and `QStyle::SH_TabBar_PreferNoArrows` .

### tabInserted

    protected void tabInserted(int index)

  This virtual handler is called after a new tab was added or inserted at position `index`.

See also:
  `tabRemoved()`.

### tabLayoutChange

    protected void tabLayoutChange()

  This virtual handler is called whenever the tab layout changes.

See also:
  `tabRect()`.

### tabRemoved

    protected void tabRemoved(int index)

  This virtual handler is called after a tab was removed from position `index`.

See also:
  `tabInserted()`.

### tabSizeHint

    protected QSize tabSizeHint(int index)

  Returns the size hint for the tab at position `index`.

### initStyleOption

    public final void initStyleOption(QStyleOptionTab option,
                                      int tabIndex)

  Initialize `option` with the values from the tab at `tabIndex`. This method is useful for subclasses when they need a QStyleOptionTab or QStyleOptionTabV2, but don't want to fill in all the information themselves. This function will check the version of the QStyleOptionTab and fill in the additional values for a QStyleOptionTabV2.

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