CategoryModel QML Type

The CategoryModel type provides a model of the categories supported by a Plugin. More...

Import Statement: import QtLocation 5.3
Since: Qt Location 5.5




Detailed Description

The CategoryModel type provides a model of the categories that are available from the current Plugin. The model supports both a flat list of categories and a hierarchical tree representing category groupings. This can be controlled by the hierarchical property.

The model supports the following roles:

categoryCategoryCategory object for the current item.
parentCategoryCategoryParent category object for the current item. If there is no parent, null is returned.

The following example displays a flat list of all available categories:

import QtQuick 2.0
import QtPositioning 5.5
import QtLocation 5.6

ListView {
    model: CategoryModel {
        plugin: myPlugin
        hierarchical: false
    delegate: Text { text: }

To access the hierarchical category model it is necessary to use a DelegateModel to access the child items.

Property Documentation

hierarchical : bool

This property holds whether the model provides a hierarchical tree of categories or a flat list. The default is true.

plugin : Plugin

This property holds the provider Plugin used by this model.

status : enumeration

This property holds the status of the model. It can be one of:

CategoryModel.NullNo category fetch query has been executed. The model is empty.
CategoryModel.ReadyNo error occurred during the last operation, further operations may be performed on the model.
CategoryModel.LoadingThe model is being updated, no other operations may be performed until complete.
CategoryModel.ErrorAn error occurred during the last operation, further operations can still be performed on the model.

Signal Documentation


This signal is emitted when significant changes have been made to the underlying datastore.

Applications should act on this signal at their own discretion. The data provided by the model could be out of date and so the model should be reupdated sometime, however an immediate reupdate may be disconcerting to users if the categories change without any action on their part.

The corresponding handler is onDataChanged.

Method Documentation

string errorString() const

This read-only property holds the textual presentation of the latest category model error. If no error has occurred, an empty string is returned.

An empty string may also be returned if an error occurred which has no associated textual representation.

© 2016 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.