Qt 5.9 | Qt QML | QML Types | ObjectModel QML Type

Qt 5.9.9 Reference Documentation

# ObjectModel QML Type

Defines a set of items to be used as a model More...

Import Statement: | import QtQml.Models 2.2

- List of all members, including inherited members

## Properties

- count : int

## Attached Properties

- index : int

## Methods

- void append(object item)
- void clear()
- object get(int index)
- void insert(int index, object item)
- void move(int from, int to, int n)
- void remove(int index, int n)

## Detailed Description

An ObjectModel contains the visual items to be used in a view. When an ObjectModel is used in a view, the view does not require a delegate since the ObjectModel already contains the visual delegate (items).

An item can determine its index within the model via the index attached property.

The example below places three colored rectangles in a ListView.

      import QtQuick 2.0
      import QtQml.Models 2.1

      Rectangle {
          ObjectModel {
              id: itemModel
              Rectangle { height: 30; width: 80; color: "red" }
              Rectangle { height: 30; width: 80; color: "green" }
              Rectangle { height: 30; width: 80; color: "blue" }
          }

          ListView {
              anchors.fill: parent
              model: itemModel
          }
      }

See also Qt Quick Examples - Views.

## Property Documentation

count : int

The number of items in the model. This property is readonly.

## Attached Property Documentation

ObjectModel.index : int

This attached property holds the index of this delegate's item within the model.

It is attached to each instance of the delegate.

## Method Documentation

void append(object item)

Appends a new item to the end of the model.

      objectModel.append(objectComponent.createObject())

This QML method was introduced in Qt 5.6.

See also insert() and remove().

void clear()

Clears all items from the model.

This QML method was introduced in Qt 5.6.

See also append() and remove().

object get(int index)

Returns the item at index in the model. This allows the item to be accessed or modified from JavaScript:

      Component.onCompleted: {
          objectModel.append(objectComponent.createObject())
          console.log(objectModel.get(0).objectName);
          objectModel.get(0).objectName = "first";
      }

The index must be an element in the list.

This QML method was introduced in Qt 5.6.

See also append().

void insert(int index, object item)

Inserts a new item to the model at position index.

      objectModel.insert(2, objectComponent.createObject())

The index must be to an existing item in the list, or one past the end of the list (equivalent to append).

This QML method was introduced in Qt 5.6.

See also append() and remove().

void move(int from, int to, int n = 1)

Moves n items from one position to another.

The from and to ranges must exist; for example, to move the first 3 items to the end of the model:

      objectModel.move(0, objectModel.count - 3, 3)

This QML method was introduced in Qt 5.6.

See also append().

void remove(int index, int n = 1)

Removes the items at index from the model.

This QML method was introduced in Qt 5.6.

See also clear().