• Qt 5.15
  • QML Types
  • ObjectModel QML Type
  • Qt 5.15.8 Reference Documentation

Contents

ObjectModel QML Type

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

Import Statement: import QtQml.Models 2.15

Properties

Attached Properties

Methods

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

append(object item)

Appends a new item to the end of the model.

 objectModel.append(objectComponent.createObject())

This method was introduced in Qt 5.6.

See also insert() and remove().


clear()

Clears all items from the model.

This 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 method was introduced in Qt 5.6.

See also append().


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 method was introduced in Qt 5.6.

See also append() and remove().


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 method was introduced in Qt 5.6.

See also append().


remove(int index, int n = 1)

Removes n items at index from the model.

This method was introduced in Qt 5.6.

See also clear().


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