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A Kirigami.OverlaySheet is a simple component that you can use to supplement the content being displayed on an application's page. They are designed to display long, vertical content and can accommodate content longer than the application window itself.
They can be dismissed by clicking or tapping outside of their area or by clicking the 'x' icon on sheets' headers.
Learning about the sheet
In order to use an overlay sheet, we should create it inside the Kirigami Page we want it to appear in.
import QtQuick 2.15
import QtQuick.Controls 2.15 as Controls
import QtQuick.Layouts 1.15
import org.kde.kirigami 2.20 as Kirigami
Kirigami.Page {
id: page
Layout.fillWidth: true
Kirigami.OverlaySheet {
id: mySheet
Controls.Label {
Layout.fillWidth: true
wrapMode: Text.WordWrap
text: "Weeeeee, overlay sheet!"
}
}
}

Overlay sheets come with methods we can use to
open()
or
close()
them as we see fit. By default overlay sheets are hidden, so at the very least we will need to use the open()
method.
Controls.Button {
text: "Open mySheet"
onClicked: mySheet.open()
}
When opened, this overlay sheet will appear centered vertically and horizontally within its parent page. Horizontally it will be bounded by its parent even if the width of its contents exceeds its parent's. If the sheet's vertical length exceeds its parent's, then the sheet will be displayed starting from its top position, and will be scrollable.
Global sheet
If you want to display the sheet as a global sheet—one that spans across the entire width of the application, regardless of the page it is a child to—we have to reparent our overlay sheet to our application window's overlay property. We can do this with the parent property.
Kirigami.OverlaySheet {
id: mySheet
parent: applicationWindow().overlay
Controls.Label {
Layout.fillWidth: true
wrapMode: Text.WordWrap
text: "Weeeeee, overlay sheet!"
}
}

Non-global overlay sheet

Global overlay sheet
Fixed sizing
A sheet is greedy and will take the maximum amount of available width in a page if needed. We can avoid this by specifying an implicitWidth or a Layout.preferredWidth for its child elements, which will limit how much the sheet will grow width wise.
Kirigami.OverlaySheet {
id: mySheet
Controls.Label {
Layout.preferredWidth: Kirigami.Units.gridUnit * 25
wrapMode: Text.WordWrap
text: "Weeeeee, overlay sheet! I'm so excited!! WEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE WEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE WEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE WEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE WEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE!!!!!"
}
}

Non-fixed width overlay sheet

Fixed width overlay sheet
Headers and footers
Overlay sheets come by default with a
header
that only contains a button for closing our overlay sheet. We can add a
Kirigami.Heading
as a title in our
header
to make it easy for users to understand what the sheet is for. This is done by setting header
to contain our heading component.
Kirigami.OverlaySheet {
id: mySheet
header: Kirigami.Heading {
text: "My Overlay Sheet"
}
Controls.Label {
Layout.fillWidth: true
wrapMode: Text.WordWrap
text: "Weeeeee, overlay sheet!"
}
}

We can also provide our overlay sheet with a footer . Footers in overlay sheets are quite flexible, but most often they are used to provide overlay sheets with some sort of quick interactive input similar to that provided by modal dialogs (e.g. buttons for "Apply", "Ok", "Cancel", "Close", etc.)
Footers are set in much the same way as headers:
Kirigami.OverlaySheet {
id: mySheet
header: Kirigami.Heading {
text: "My Overlay Sheet"
}
footer: Controls.DialogButtonBox {
standardButtons: DialogButtonBox.Close
onRejected: mySheet.close()
}
Controls.Label {
Layout.fillWidth: true
wrapMode: Text.WordWrap
text: "Weeeeee, overlay sheet!"
}
}

Using delegate / model views
Since overlay sheets are designed to display vertical content, they can be especially useful when used in conjunction with components such as ListViews . When displaying content longer than the application window itself, the overlay sheet becomes scrollable:
Kirigami.OverlaySheet {
id: mySheet
ListView {
model: 100
implicitWidth: Kirigami.Units.gridUnit * 30
delegate: Kirigami.BasicListItem {
label: "Item in sheet " + modelData
}
}
}
