Qt 5.11 | Qt Quick Controls 2 | QML Types | Popup QML Type

Qt 5.11.3 Reference Documentation

# Popup QML Type

Base type of popup-like user interface controls. More...

Import Statement: | import QtQuick.Controls 2.4
Since: | Qt 5.7
Inherited By: | Dialog, Drawer, Menu, and ToolTip

- List of all members, including inherited members

## Properties

- activeFocus : bool
- availableHeight : real
- availableWidth : real
- background : Item
- bottomMargin : real
- bottomPadding : real
- clip : bool
- closePolicy : enumeration
- contentChildren : list<Item>
- contentData : list<Object>
- contentHeight : real
- contentItem : Item
- contentWidth : real
- dim : bool
- enabled : bool
- enter : Transition
- exit : Transition
- focus : bool
- font : font
- height : real
- implicitHeight : real
- implicitWidth : real
- leftMargin : real
- leftPadding : real
- locale : Locale
- margins : real
- mirrored : bool
- modal : bool
- opacity : real
- opened : bool
- padding : real
- palette : palette
- parent : Item
- rightMargin : real
- rightPadding : real
- scale : real
- spacing : real
- topMargin : real
- topPadding : real
- transformOrigin : enumeration
- visible : bool
- width : real
- x : real
- y : real
- z : real

## Signals

- void aboutToHide()
- void aboutToShow()
- void closed()
- void opened()

## Methods

- void close()
- forceActiveFocus(reason = Qt.OtherFocusReason)
- void open()

## Detailed Description

Popup is the base type of popup-like user interface controls. It can be used with Window or ApplicationWindow.

      import QtQuick.Window 2.2
      import QtQuick.Controls 2.1

      ApplicationWindow {
          id: window
          width: 400
          height: 400
          visible: true

          Button {
              text: "Open"
              onClicked: popup.open()
          }

          Popup {
              id: popup
              x: 100
              y: 100
              width: 200
              height: 300
              modal: true
              focus: true
              closePolicy: Popup.CloseOnEscape | Popup.CloseOnPressOutsideParent
          }
      }

In order to ensure that a popup is displayed above other items in the scene, it is recommended to use ApplicationWindow. ApplicationWindow also provides background dimming effects.

Popup does not provide a layout of its own, but requires you to position its contents, for instance by creating a RowLayout or a ColumnLayout.

Items declared as children of a Popup are automatically parented to the Popups's contentItem. Items created dynamically need to be explicitly parented to the contentItem.

## Popup Layout

The following diagram illustrates the layout of a popup within a window:

The implicitWidth and implicitHeight of a popup are typically based on the implicit sizes of the background and the content item plus any padding. These properties determine how large the popup will be when no explicit width or height is specified.

The background item fills the entire width and height of the popup, unless an explicit size has been given for it.

The geometry of the contentItem is determined by the padding.

## Popup Sizing

If only a single item is used within a Popup, it will resize to fit the implicit size of its contained item. This makes it particularly suitable for use together with layouts.

      Popup {
          ColumnLayout {
              anchors.fill: parent
              CheckBox { text: qsTr("E-mail") }
              CheckBox { text: qsTr("Calendar") }
              CheckBox { text: qsTr("Contacts") }
          }
      }

Sometimes there might be two items within the popup:

      Popup {
          SwipeView {
              // ...
          }
          PageIndicator {
              anchors.horizontalCenter: parent.horizontalCenter
              anchors.bottom: parent.bottom
          }
      }

In this case, Popup cannot calculate a sensible implicit size. Since we're anchoring the PageIndicator over the SwipeView, we can simply set the content size to the view's implicit size:

      Popup {
          contentWidth: view.implicitWidth
          contentHeight: view.implicitHeight

          SwipeView {
              id: view
              // ...
          }
          PageIndicator {
              anchors.horizontalCenter: parent.horizontalCenter
              anchors.bottom: parent.bottom
          }
       }

## Popup Positioning

Similar to items in Qt Quick, Popup's x and y coordinates are relative to its parent. This means that opening a popup that is a child of a Button, for example, will cause the popup to be positioned relative to the button.

The following example uses the attached Overlay.overlay property to position a popup in the center of the window, despite the position of the button that opens the popup:

      Button {
          onClicked: popup.open()

          Popup {
              id: popup

              parent: Overlay.overlay

              x: Math.round((parent.width - width) / 2)
              y: Math.round((parent.height - height) / 2)
              width: 100
              height: 100
          }
      }

See also Popup Controls, Customizing Popup, and ApplicationWindow.

## Property Documentation

[read-only] activeFocus : bool

This property holds whether the popup has active focus.

See also focus and Keyboard Focus in Qt Quick.

[read-only] availableHeight : real

This property holds the height available to the contentItem after deducting vertical padding from the height of the popup.

See also padding, topPadding, and bottomPadding.

[read-only] availableWidth : real

This property holds the width available to the contentItem after deducting horizontal padding from the width of the popup.

See also padding, leftPadding, and rightPadding.

background : Item

This property holds the background item.

Note: If the background item has no explicit size specified, it automatically follows the popup's size. In most cases, there is no need to specify width or height for a background item.

Note: Most popups use the implicit size of the background item to calculate the implicit size of the popup itself. If you replace the background item with a custom one, you should also consider providing a sensible implicit size for it (unless it is an item like Image which has its own implicit size).

See also Customizing Popup.

bottomMargin : real

This property holds the distance between the bottom edge of the popup and the bottom edge of its window.

A popup with a negative bottom margin is not pushed within the bottom edge of the enclosing window. The default value is `-1`.

See also margins, topMargin, and Popup Layout.

bottomPadding : real

This property holds the bottom padding.

The padding properties are used to control the geometry of the content item.

Popup uses the same approach to padding as Control. For a visual explanation of the padding system, see the Control Layout section of the documentation.

See also padding, topPadding, and availableHeight.

clip : bool

This property holds whether clipping is enabled. The default value is `false`.

closePolicy : enumeration

This property determines the circumstances under which the popup closes. The flags can be combined to allow several ways of closing the popup.

The available values are:

Constant | Description
--- | ---
`Popup.NoAutoClose` | The popup will only close when manually instructed to do so.
`Popup.CloseOnPressOutside` | The popup will close when the mouse is pressed outside of it.
`Popup.CloseOnPressOutsideParent` | The popup will close when the mouse is pressed outside of its parent.
`Popup.CloseOnReleaseOutside` | The popup will close when the mouse is released outside of it.
`Popup.CloseOnReleaseOutsideParent` | The popup will close when the mouse is released outside of its parent.
`Popup.CloseOnEscape` | The popup will close when the escape key is pressed while the popup has active focus.

The default value is `Popup.CloseOnEscape | Popup.CloseOnPressOutside`.

Note: There is a known limitation that the `Popup.CloseOnReleaseOutside` and `Popup.CloseOnReleaseOutsideParent` policies only work with modal popups.

contentChildren : list<Item>

This property holds the list of content children.

The list contains all items that have been declared in QML as children of the popup.

Note: Unlike `contentData`, `contentChildren` does not include non-visual QML objects.

See also Item::children and contentData.

[default] contentData : list<Object>

This property holds the list of content data.

The list contains all objects that have been declared in QML as children of the popup.

Note: Unlike `contentChildren`, `contentData` does include non-visual QML objects.

See also Item::data and contentChildren.

contentHeight : real

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

For more information, see Popup Sizing.

See also contentWidth.

contentItem : Item

This property holds the content item of the popup.

The content item is the visual implementation of the popup. When the popup is made visible, the content item is automatically reparented to the overlay item of its application window.

Note: The content item is automatically resized to fit within the padding of the popup.

Note: Most popups use the implicit size of the content item to calculate the implicit size of the popup itself. If you replace the content item with a custom one, you should also consider providing a sensible implicit size for it (unless it is an item like Text which has its own implicit size).

See also Customizing Popup.

contentWidth : real

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

For more information, see Popup Sizing.

See also contentHeight.

dim : bool

This property holds whether the popup dims the background.

Unless explicitly set, this property follows the value of modal. To return to the default value, set this property to `undefined`.

See also modal.

enabled : bool

This property holds whether the popup is enabled. The default value is `true`.

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

See also visible and Item::enabled.

enter : Transition

This property holds the transition that is applied to the popup item when the popup is opened and enters the screen.

The following example animates the opacity of the popup when it enters the screen:

      Popup {
          enter: Transition {
              NumberAnimation { property: "opacity"; from: 0.0; to: 1.0 }
          }
      }

See also exit.

exit : Transition

This property holds the transition that is applied to the popup item when the popup is closed and exits the screen.

The following example animates the opacity of the popup when it exits the screen:

      Popup {
          exit: Transition {
              NumberAnimation { property: "opacity"; from: 1.0; to: 0.0 }
          }
      }

See also enter.

focus : bool

This property holds whether the popup wants focus.

When the popup actually receives focus, activeFocus will be `true`. For more information, see Keyboard Focus in Qt Quick.

The default value is `false`.

See also activeFocus.

font : font

This property holds the font currently set for the popup.

Popup propagates explicit font properties to its children. If you change a specific property on a popup's font, that property propagates to all of the popup's children, overriding any system defaults for that property.

      Popup {
          font.family: "Courier"

          Column {
              Label {
                  text: qsTr("This will use Courier...")
              }

              Switch {
                  text: qsTr("... and so will this")
              }
          }
      }

See also Control::font and ApplicationWindow::font.

height : real

This property holds the height of the popup.

implicitHeight : real

This property holds the implicit height of the popup.

implicitWidth : real

This property holds the implicit width of the popup.

leftMargin : real

This property holds the distance between the left edge of the popup and the left edge of its window.

A popup with a negative left margin is not pushed within the left edge of the enclosing window. The default value is `-1`.

See also margins, rightMargin, and Popup Layout.

leftPadding : real

This property holds the left padding.

The padding properties are used to control the geometry of the content item.

Popup uses the same approach to padding as Control. For a visual explanation of the padding system, see the Control Layout section of the documentation.

See also padding, rightPadding, and availableWidth.

locale : Locale

This property holds the locale of the popup.

See also mirrored and LayoutMirroring.

margins : real

This property holds the distance between the edges of the popup and the edges of its window.

A popup with negative margins is not pushed within the bounds of the enclosing window. The default value is `-1`.

See also topMargin, leftMargin, rightMargin, bottomMargin, and Popup Layout.

[read-only] mirrored : bool

This property holds whether the popup is mirrored.

This property is provided for convenience. A popup is considered mirrored when its visual layout direction is right-to-left; that is, when using a right-to-left locale.

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

See also locale and Right-to-left User Interfaces.

modal : bool

This property holds whether the popup is modal.

Modal popups often have a distinctive background dimming effect defined in overlay.modal, and do not allow press or release events through to items beneath them.

On desktop platforms, it is common for modal popups to be closed only when the escape key is pressed. To achieve this behavior, set closePolicy to `Popup.CloseOnEscape`.

The default value is `false`.

opacity : real

This property holds the opacity of the popup. Opacity is specified as a number between `0.0` (fully transparent) and `1.0` (fully opaque). The default value is `1.0`.

See also visible.

opened : bool

This property holds whether the popup is fully open. The popup is considered opened when it's visible and neither the enter nor exit transitions are running.

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

See also open(), close(), and visible.

padding : real

This property holds the default padding.

The padding properties are used to control the geometry of the content item.

Popup uses the same approach to padding as Control. For a visual explanation of the padding system, see the Control Layout section of the documentation.

See also availableWidth, availableHeight, topPadding, leftPadding, rightPadding, and bottomPadding.

palette : palette

This property holds the palette currently set for the popup.

Popup propagates explicit palette properties to its children. If you change a specific property on a popup's palette, that property propagates to all of the popup's children, overriding any system defaults for that property.

      Popup {
          palette.text: "red"

          Column {
              Label {
                  text: qsTr("This will use red color...")
              }

              Switch {
                  text: qsTr("... and so will this")
              }
          }
      }

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

See also Control::palette, ApplicationWindow::palette, and palette QML Basic Type.

parent : Item

This property holds the parent item.

rightMargin : real

This property holds the distance between the right edge of the popup and the right edge of its window.

A popup with a negative right margin is not pushed within the right edge of the enclosing window. The default value is `-1`.

See also margins, leftMargin, and Popup Layout.

rightPadding : real

This property holds the right padding.

The padding properties are used to control the geometry of the content item.

Popup uses the same approach to padding as Control. For a visual explanation of the padding system, see the Control Layout section of the documentation.

See also padding, leftPadding, and availableWidth.

scale : real

This property holds the scale factor of the popup. The default value is `1.0`.

A scale of less than `1.0` causes the popup to be rendered at a smaller size, and a scale greater than `1.0` renders the popup at a larger size. A negative scale causes the popup to be mirrored when rendered.

spacing : real

This property holds the spacing.

Spacing is useful for popups that have multiple or repetitive building blocks. For example, some styles use spacing to determine the distance between the header, content, and footer of Dialog. Spacing is not enforced by Popup, so each style may interpret it differently, and some may ignore it altogether.

This property was introduced in QtQuick.Controls 2.1 (Qt 5.8).

topMargin : real

This property holds the distance between the top edge of the popup and the top edge of its window.

A popup with a negative top margin is not pushed within the top edge of the enclosing window. The default value is `-1`.

See also margins, bottomMargin, and Popup Layout.

topPadding : real

This property holds the top padding.

The padding properties are used to control the geometry of the content item.

Popup uses the same approach to padding as Control. For a visual explanation of the padding system, see the Control Layout section of the documentation.

See also padding, bottomPadding, and availableHeight.

transformOrigin : enumeration

This property holds the origin point for transformations in enter and exit transitions.

Nine transform origins are available, as shown in the image below. The default transform origin is `Popup.Center`.

See also enter, exit, and Item::transformOrigin.

visible : bool

This property holds whether the popup is visible. The default value is `false`.

See also open(), close(), and opened.

width : real

This property holds the width of the popup.

x : real

This property holds the x-coordinate of the popup.

See also y and z.

y : real

This property holds the y-coordinate of the popup.

See also x and z.

z : real

This property holds the z-value of the popup. Z-value determines the stacking order of popups.

If two visible popups have the same z-value, the last one that was opened will be on top.

The default z-value is `0`.

See also x and y.

## Signal Documentation

void aboutToHide()

This signal is emitted when the popup is about to hide.

See also closed().

void aboutToShow()

This signal is emitted when the popup is about to show.

See also opened().

void closed()

This signal is emitted when the popup is closed.

See also aboutToHide().

void opened()

This signal is emitted when the popup is opened.

See also aboutToShow().

## Method Documentation

void close()

Closes the popup.

See also visible.

forceActiveFocus(reason = Qt.OtherFocusReason)

Forces active focus on the popup with the given reason.

This method sets focus on the popup and ensures that all ancestor FocusScope objects in the object hierarchy are also given focus.

See also activeFocus and Qt::FocusReason.

void open()

Opens the popup.

See also visible.