- Qt 6.8
- Qt Quick Controls
- QML Types
- TabBar
- Qt 6.8.1 Reference Documentation

# TabBar QML Type

Allows the user to switch between different views or subtasks. More...

Import Statement: | `import QtQuick.Controls`
Inherits: | Container

- List of all members, including inherited members

## Properties

- contentHeight : real `(since QtQuick.Controls 2.2 (Qt 5.9))`
- contentWidth : real `(since QtQuick.Controls 2.2 (Qt 5.9))`
- position : enumeration

## Attached Properties

- index : int `(since QtQuick.Controls 2.3 (Qt 5.10))`
- position : enumeration `(since QtQuick.Controls 2.3 (Qt 5.10))`
- tabBar : TabBar `(since QtQuick.Controls 2.3 (Qt 5.10))`

## Detailed Description

TabBar provides a tab-based navigation model.

TabBar is populated with TabButton controls, and can be used together with any layout or container control that provides `currentIndex` -property, such as StackLayout or SwipeView

     TabBar {
         id: bar
         width: parent.width
         TabButton {
             text: qsTr("Home")
         }
         TabButton {
             text: qsTr("Discover")
         }
         TabButton {
             text: qsTr("Activity")
         }
     }

     StackLayout {
         width: parent.width
         currentIndex: bar.currentIndex
         Item {
             id: homeTab
         }
         Item {
             id: discoverTab
         }
         Item {
             id: activityTab
         }
     }

As shown above, TabBar is typically populated with a static set of tab buttons that are defined inline as children of the tab bar. It is also possible to add, insert, move, and remove items dynamically at run time. The items can be accessed using itemAt() or contentChildren.

When TabBar is paired with another container such as SwipeView, it is necessary to make a two-way binding between the currentIndex property of each control. To do this without breaking bindings, avoid setting `currentIndex` directly, and instead use setCurrentIndex(), for example. See Managing the Current Index for more information.

To perform an action when `currentIndex` changes, use the `onCurrentIndexChanged` property change signal handler:

     onCurrentIndexChanged: {
         print("currentIndex changed to", currentIndex)
         // ...
     }

### Resizing Tabs

By default, TabBar resizes its buttons to fit the width of the control. The available space is distributed equally to each button. The default resizing behavior can be overridden by setting an explicit width for the buttons.

The following example illustrates how to keep each tab button at their implicit size instead of being resized to fit the tabbar:

     TabBar {
         width: parent.width
         TabButton {
             text: "First"
             width: implicitWidth
         }
         TabButton {
             text: "Second"
             width: implicitWidth
         }
         TabButton {
             text: "Third"
             width: implicitWidth
         }
     }

### Flickable Tabs

If the total width of the buttons exceeds the available width of the tab bar, it automatically becomes flickable.

     TabBar {
         id: bar
         width: parent.width

         Repeater {
             model: ["First", "Second", "Third", "Fourth", "Fifth"]

             TabButton {
                 text: modelData
                 width: Math.max(100, bar.width / 5)
             }
         }
     }

See also TabButton, Customizing TabBar, Navigation Controls, Container Controls, and Focus Management in Qt Quick Controls.

## Property Documentation

contentHeight : real `[since QtQuick.Controls 2.2 (Qt 5.9)]`

This property holds the content height. It is used for calculating the total implicit height of the tab bar.

Note: This property is available in TabBar since QtQuick.Controls 2.2 (Qt 5.9), but it was promoted to the Container base type in QtQuick.Controls 2.5 (Qt 5.12).

This property was introduced in QtQuick.Controls 2.2 (Qt 5.9).

See also Container::contentHeight.

contentWidth : real `[since QtQuick.Controls 2.2 (Qt 5.9)]`

This property holds the content width. It is used for calculating the total implicit width of the tab bar.

Note: This property is available in TabBar since QtQuick.Controls 2.2 (Qt 5.9), but it was promoted to the Container base type in QtQuick.Controls 2.5 (Qt 5.12).

This property was introduced in QtQuick.Controls 2.2 (Qt 5.9).

See also Container::contentWidth.

position : enumeration

This property holds the position of the tab bar.

Note: If the tab bar is assigned as a header or footer of ApplicationWindow or Page, the appropriate position is set automatically.

Possible values:

Constant | Description
--- | ---
`TabBar.Header` | The tab bar is at the top, as a window or page header.
`TabBar.Footer` | The tab bar is at the bottom, as a window or page footer.

The default value is style-specific.

See also ApplicationWindow::header, ApplicationWindow::footer, Page::header, and Page::footer.

## Attached Property Documentation

TabBar.index : int `[read-only, since QtQuick.Controls 2.3 (Qt 5.10)]`

This attached property holds the index of each tab button in the TabBar.

It is attached to each tab button of the TabBar.

This property was introduced in QtQuick.Controls 2.3 (Qt 5.10).

TabBar.position : enumeration `[read-only, since QtQuick.Controls 2.3 (Qt 5.10)]`

This attached property holds the position of the tab bar.

It is attached to each tab button of the TabBar.

Possible values:

Constant | Description
--- | ---
`TabBar.Header` | The tab bar is at the top, as a window or page header.
`TabBar.Footer` | The tab bar is at the bottom, as a window or page footer.

This property was introduced in QtQuick.Controls 2.3 (Qt 5.10).

TabBar.tabBar : TabBar `[read-only, since QtQuick.Controls 2.3 (Qt 5.10)]`

This attached property holds the tab bar that manages this tab button.

It is attached to each tab button of the TabBar.

This property was introduced in QtQuick.Controls 2.3 (Qt 5.10).