SplitView QML Type

Lays out items with a draggable splitter between each item. More...

Import Statement: import QtQuick.Controls 2.5
Since: Qt 5.13
Inherits:

Control

Properties

Attached Properties

Methods

Detailed Description

SplitView is a control that lays out items horizontally or vertically with a draggable splitter between each item.

SplitView supports the following attached properties on items it manages:

  • SplitView.minimumWidth
  • SplitView.minimumHeight
  • SplitView.preferredWidth
  • SplitView.preferredHeight
  • SplitView.maximumWidth
  • SplitView.maximumHeight
  • SplitView.fillWidth (true for only one child)
  • SplitView.fillHeight (true for only one child)

In addition, each handle has the following read-only attached properties:

  • SplitHandle.hovered
  • SplitHandle.pressed

The preferred size of items in a SplitView can be specified via implicitWidth and implicitHeight or SplitView.preferredWidth and SplitView.preferredHeight:

SplitView {
    anchors.fill: parent

    Item {
        SplitView.preferredWidth: 50
    }

    // ...
}

For a horizontal SplitView, it's not necessary to specify the preferred height of each item, as they will be resized to the height of the view. This applies in reverse for vertical views.

When a split handle is dragged, the SplitView.preferredWidth or SplitView.preferredHeight property is overwritten, depending on the orientation of the view.

To limit the size of items in a horizontal view, use the following properties:

SplitView {
    anchors.fill: parent

    Item {
        SplitView.minimumWidth: 25
        SplitView.preferredWidth: 50
        SplitView.maximumWidth: 100
    }

    // ...
}

To limit the size of items in a vertical view, use the following properties:

SplitView {
    anchors.fill: parent
    orientation: Qt.Vertical

    Item {
        SplitView.minimumHeight: 25
        SplitView.preferredHeight: 50
        SplitView.maximumHeight: 100
    }

    // ...
}

There will always be one item (the fill item) in the SplitView that has SplitView.fillWidth set to true (or SplitView.fillHeight, if orientation is Qt.Vertical). This means that the item will get all leftover space when other items have been laid out. By default, the last visible child of the SplitView will have this set, but it can be changed by explicitly setting fillWidth to true on another item.

A handle can belong to the item either on the left or top side, or on the right or bottom side:

  • If the fill item is to the right: the handle belongs to the left item.
  • If the fill item is on the left: the handle belongs to the right item.

To create a SplitView with three items, and let the center item get superfluous space, one could do the following:

SplitView {
    anchors.fill: parent
    orientation: Qt.Horizontal

    Rectangle {
        implicitWidth: 200
        SplitView.maximumWidth: 400
        color: "lightblue"
        Label {
            text: "View 1"
            anchors.centerIn: parent
        }
    }
    Rectangle {
        id: centerItem
        SplitView.minimumWidth: 50
        SplitView.fillWidth: true
        color: "lightgray"
        Label {
            text: "View 2"
            anchors.centerIn: parent
        }
    }
    Rectangle {
        implicitWidth: 200
        color: "lightgreen"
        Label {
            text: "View 3"
            anchors.centerIn: parent
        }
    }
}

Serializing SplitView's State

The main purpose of SplitView is to allow users to easily configure the size of various UI elements. In addition, the user's preferred sizes should be remembered across sessions. To achieve this, the values of the SplitView.preferredWidth and SplitView.preferredHeight properties can be serialized using the saveState() and restoreState() functions:

import QtQuick.Controls 2.15
import Qt.labs.settings 1.0

ApplicationWindow {
    // ...

    Component.onCompleted: splitView.restoreState(settings.splitView)
    Component.onDestruction: settings.splitView = splitView.saveState()

    Settings {
        id: settings
        property var splitView
    }

    SplitView {
        id: splitView
        // ...
    }
}

Alternatively, the value() and setValue() functions of Settings can be used:

import QtQuick.Controls 2.15
import Qt.labs.settings 1.0

ApplicationWindow {
    // ...

    Component.onCompleted: splitView.restoreState(settings.value("ui/splitview"))
    Component.onDestruction: settings.setValue("ui/splitview", splitView.saveState())

    Settings {
        id: settings
    }

    SplitView {
        id: splitView
        // ...
    }
}

See also SplitHandle, Customizing SplitView, and Container Controls.

Property Documentation

handle : Component

This property holds the handle component.

An instance of this component will be instantiated count - 1 times, as long as count is greater than than 1.

The following table explains how each handle will be resized depending on the orientation of the split view:

OrientationHandle WidthHandle Height
Qt.HorizontalimplicitWidthThe height of the SplitView.
Qt.VerticalThe width of the SplitView.implicitHeight

See also Customizing SplitView.


orientation : enumeration

This property holds the orientation of the SplitView.

The orientation determines how the split items are laid out:

Possible values:

ConstantDescription
Qt.HorizontalThe items are laid out horizontally (default).
Qt.VerticalThe items are laid out vertically.

[read-only] resizing : bool

This property is true when the user is resizing split items by dragging on the splitter handles.


Attached Property Documentation

SplitView.fillHeight : bool

This attached property controls whether the item takes the remaining space in the split view after all other items have been laid out.

By default, the last visible child of the split view will have this set, but it can be changed by explicitly setting fillHeight to true on another item.

The height of a split item with fillHeight set to true is still restricted within its minimumHeight and maximumHeight.

See also minimumHeight, preferredHeight, maximumHeight, and fillWidth.


SplitView.fillWidth : bool

This attached property controls whether the item takes the remaining space in the split view after all other items have been laid out.

By default, the last visible child of the split view will have this set, but it can be changed by explicitly setting fillWidth to true on another item.

The width of a split item with fillWidth set to true is still restricted within its minimumWidth and maximumWidth.

See also minimumWidth, preferredWidth, maximumWidth, and fillHeight.


SplitView.maximumHeight : real

This attached property controls the maximum height of the split item. The preferredHeight is bound within the minimumHeight and maximumHeight. A split item cannot be dragged to be larger than its maximumHeight.

The default value is Infinity. To reset this property to its default value, set it to undefined.

See also minimumHeight, preferredHeight, fillHeight, and maximumWidth.


SplitView.maximumWidth : real

This attached property controls the maximum width of the split item. The preferredWidth is bound within the minimumWidth and maximumWidth. A split item cannot be dragged to be larger than its maximumWidth.

The default value is Infinity. To reset this property to its default value, set it to undefined.

See also minimumWidth, preferredWidth, fillWidth, and maximumHeight.


SplitView.minimumHeight : real

This attached property controls the minimum height of the split item. The preferredHeight is bound within the minimumHeight and maximumHeight. A split item cannot be dragged to be smaller than its minimumHeight.

The default value is 0. To reset this property to its default value, set it to undefined.

See also maximumHeight, preferredHeight, fillHeight, and minimumWidth.


SplitView.minimumWidth : real

This attached property controls the minimum width of the split item. The preferredWidth is bound within the minimumWidth and maximumWidth. A split item cannot be dragged to be smaller than its minimumWidth.

The default value is 0. To reset this property to its default value, set it to undefined.

See also maximumWidth, preferredWidth, fillWidth, and minimumHeight.


SplitView.preferredHeight : real

This attached property controls the preferred height of the split item. The preferred height will be used as the size of the item, and will be bound within the minimumHeight and maximumHeight. If the preferred height is not set, the item's implicitHeight will be used.

When a split item is resized, the preferredHeight will be set in order to keep track of the new size.

By default, this property is not set, and therefore implicitHeight will be used instead. To reset this property to its default value, set it to undefined.

Note: Do not set the height property of a split item, as it will be overwritten upon each layout of the SplitView.

See also minimumHeight, maximumHeight, fillHeight, and preferredWidth.


SplitView.preferredWidth : real

This attached property controls the preferred width of the split item. The preferred width will be used as the size of the item, and will be bound within the minimumWidth and maximumWidth. If the preferred width is not set, the item's implicitWidth will be used.

When a split item is resized, the preferredWidth will be set in order to keep track of the new size.

By default, this property is not set, and therefore implicitWidth will be used instead. To reset this property to its default value, set it to undefined.

Note: Do not set the width property of a split item, as it will be overwritten upon each layout of the SplitView.

See also minimumWidth, maximumWidth, fillWidth, and preferredHeight.


SplitView.view : SplitView

This attached property holds the split view of the item it is attached to, or null if the item is not in a split view.


Method Documentation

bool restoreState(state)

Reads the preferred sizes from state and applies them to the split items.

Returns true if the state was successfully restored, otherwise false.

See also Serializing SplitView's State and saveState().


var saveState()

Saves the preferred sizes of split items into a byte array and returns it.

See also Serializing SplitView's State and restoreState().


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