- Qt 6.8
- Qt Quick Controls
- Qt Quick Controls QML Types
- Qt 6.8.3 Reference Documentation

# Qt Quick Controls QML Types

Qt Quick Controls provides QML types for creating user interfaces. These QML types work in conjunction with Qt Quick and Qt Quick Layouts.

Qt Quick Controls QML types can be imported into your application using the following import statement in your .qml file:

     import QtQuick.Controls

## QML Types

AbstractButton | Abstract base type providing functionality common to buttons
Action | Abstract user interface action
ActionGroup | Groups actions together
ApplicationWindow | Styled top-level window with support for a header and footer
BusyIndicator | Indicates background activity, for example, while content is being loaded
Button | Push-button that can be clicked to perform a command or answer a question
ButtonGroup | Mutually-exclusive group of checkable buttons
Calendar | A calendar namespace
CalendarModel | A calendar model
CheckBox | Check button that can be toggled on or off
CheckDelegate | Item delegate with a check indicator that can be toggled on or off
ComboBox | Combined button and popup list for selecting options
Container | Abstract base type providing functionality common to containers
Control | Abstract base type providing functionality common to all controls
DayOfWeekRow | A row of names for the days in a week
DelayButton | Check button that triggers when held down long enough
Dial | Circular dial that is rotated to set a value
Dialog | Popup dialog with standard buttons and a title, used for short-term interaction with the user
DialogButtonBox | A button box used in dialogs
Drawer | Side panel that can be opened and closed using a swipe gesture
Frame | Visual frame for a logical group of controls
GroupBox | Visual frame and title for a logical group of controls
HorizontalHeaderView | Provides a horizontal header view to accompany a TableView
ItemDelegate | Basic item delegate that can be used in various views and controls
Label | Styled text label with inherited font
Menu | Popup that can be used as a context menu or popup menu
MenuBar | Provides a window menu bar
MenuBarItem | Presents a drop-down menu within a MenuBar
MenuItem | Presents an item within a Menu
MenuSeparator | Separates a group of items in a menu from adjacent items
MonthGrid | A grid of days for a calendar month
Overlay | A window overlay for popups
Page | Styled page control with support for a header and footer
PageIndicator | Indicates the currently active page
Pane | Provides a background matching with the application style and theme
Popup | Base type of popup-like user interface controls
ProgressBar | Indicates the progress of an operation
RadioButton | Exclusive radio button that can be toggled on or off
RadioDelegate | Exclusive item delegate with a radio indicator that can be toggled on or off
RangeSlider | Used to select a range of values by sliding two handles along a track
RoundButton | A push-button control with rounded corners that can be clicked by the user
ScrollBar | Vertical or horizontal interactive scroll bar
ScrollIndicator | Vertical or horizontal non-interactive scroll indicator
ScrollView | Scrollable view
SelectionRectangle | Used to select table cells inside a TableView
Slider | Used to select a value by sliding a handle along a track
SpinBox | Allows the user to select from a set of preset values
SplitHandle | Provides attached properties for SplitView handles
SplitView | Lays out items with a draggable splitter between each item
StackView | Provides a stack-based navigation model
SwipeDelegate | Swipable item delegate
SwipeView | Enables the user to navigate pages by swiping sideways
Switch | Button that can be toggled on or off
SwitchDelegate | Item delegate with a switch indicator that can be toggled on or off
TabBar | Allows the user to switch between different views or subtasks
TabButton | Button with a look suitable for a TabBar
TextArea | Multi-line text input area
TextField | Single-line text input field
ToolBar | Container for context-sensitive controls
ToolButton | Button with a look suitable for a ToolBar
ToolSeparator | Separates a group of items in a toolbar from adjacent items
ToolTip | Provides tool tips for any control
TreeViewDelegate | A delegate that can be assigned to a TreeView
Tumbler | Spinnable wheel of items that can be selected
VerticalHeaderView | Offers a vertical header view to accompany a TableView
WeekNumberColumn | A column of week numbers

## Using Qt Quick Controls types in property declarations

As mentioned in Qt Quick Templates 2 QML Types, each type in Qt Quick Controls is backed by a C++ "template" type. These types are non-visual implementations of controls' logic and behavior.

For example, the Menu type's API and behavior is defined by the C++ type in Qt Quick Templates. Each style that wants to provide a Menu must have a Menu.qml available, and the root item in that file must be the Menu from Qt Quick Templates. When you import QtQuick.Controls and create a Menu in QML, the type you get is actually the QML Menu defined by the style's Menu.qml.

In order to use a control as the type in a property declaration, you should use the corresponding type from Qt Quick Templates. For example, suppose you had a `PopupOpener` component, which was a Button that opened a Popup:

     // PopupButton.qml
     import QtQuick.Controls

     Button {
         required property Popup popup

         onClicked: popup.open()
     }

     // main.qml
     PopupButton {
         popup: saveChangesDialog
     }

     Dialog {
         id: saveChangesDialog

         // ...
     }

Running this code will result in an error:

     Unable to assign Dialog_QMLTYPE to Popup_QMLTYPE

This is because of the inheritance hierarchy:

     Popup (C++ type in QtQuick.Templates)
     │   └── Popup (QML type in QtQuick.Controls)
     └── Dialog (C++ type in QtQuick.Templates)
         └── Dialog (QML type in QtQuick.Controls)

Dialog from `QtQuick.Controls` does not derive from the Popup from `QtQuick.Controls`, but from `QtQuick.Templates`.

Instead, use the Popup from Qt Quick Templates as the property type:

     // PopupButton.qml
     import QtQuick.Controls
     import QtQuick.Templates as T

     Button {
         required property T.Popup popup

         onClicked: popup.open()
     }

For more information on the Qt Quick Controls module, see the Qt Quick Controls module documentation.

## Related Information

- Qt Quick Controls Guidelines