PlaceSearchSuggestionModel QML Type

Provides access to search term suggestions. 更多...

import 语句：	import QtLocation 5.12
Since:	QtLocation 5.5

所有成员列表，包括继承成员

特性

limit : int
offset : int
plugin : Plugin
searchArea : geoshape
searchTerm : string
status : enum
suggestions : stringlist

方法

void cancel ()
string errorString ()
void reset ()
void update ()

详细描述

The PlaceSearchSuggestionModel can be used to provide search term suggestions as the user enters their search term. The properties of this model should match that of the PlaceSearchModel , which will be used to perform the actual search query, to ensure that the search suggestion results are relevant.

There are two ways of accessing the data provided by this model, either through the suggestions property or through views and delegates. The latter is the preferred method.

The offset and limit properties can be used to access paged suggestions. When the offset and limit properties are set the suggestions between offset and ( offset + limit - 1) will be returned. Support for paging may vary from plugin to plugin.

The model returns data for the following roles:

角色	类型	描述
suggestion	string	Suggested search term.

The following example shows how to use the PlaceSearchSuggestionModel to get suggested search terms from a partial search term. The searchArea is set to match what would be used to perform the actual place search with PlaceSearchModel .

import QtQuick 2.0
import QtPositioning 5.5
import QtLocation 5.6
PlaceSearchSuggestionModel {
    id: suggestionModel
    plugin: myPlugin
    // Brisbane
    searchArea: QtPositioning.circle(QtPositioning.coordinate(-27.46778, 153.02778))
    onSearchTermChanged: update()
}
ListView {
    model: suggestionModel
    delegate: Text { text: suggestion }
}

另请参阅 PlaceSearchModel and QPlaceManager .

特性文档编制

limit : int

This property holds the limit of the number of items that will be returned.

另请参阅 offset .

offset : int

This property holds the index of the first item in the model.

另请参阅 limit .

plugin : Plugin

This property holds the provider Plugin which will be used to perform the search.

searchArea : geoshape

This property holds the search area. Search suggestion results returned by the model will be relevant to the given search area.

If this property is set to a geocircle its radius property may be left unset, in which case the Plugin will choose an appropriate radius for the search.

searchTerm : string

This property holds the partial search term used in query.

status : enum

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

PlaceSearchSuggestionModel .Null	No search query has been executed. The model is empty.
PlaceSearchSuggestionModel .Ready	The search query has completed, and the results are available.
PlaceSearchSuggestionModel .Loading	A search query is currently being executed.
PlaceSearchSuggestionModel .Error	An error occurred when executing the previous search query.

suggestions : stringlist

This property holds the list of predicted search terms that the model currently has.

方法文档编制

void cancel ()

Cancels an ongoing search suggestion operation immediately and sets the model status to PlaceSearchSuggestionModel .Ready. The model retains any search suggestions it had before the operation was started.

If an operation is not ongoing, invoking cancel() has no effect.

另请参阅 update() and status .

string errorString ()

This read-only property holds the textual presentation of the latest search suggestion model error. If no error has occurred, or if the model was cleared, an empty string is returned.

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

void reset ()

Resets the model. All search suggestions are cleared, any outstanding requests are aborted and possible errors are cleared. Model status will be set to PlaceSearchSuggestionModel .Null.

void update ()

Updates the model based on the provided query parameters. The model will be populated with a list of search suggestions for the partial searchTerm and searchArea 。若 plugin supports it, other parameters such as limit and offset may be specified. update() submits the set of parameters to the plugin to process.

While the model is updating the status of the model is set to PlaceSearchSuggestionModel.Loading . If the model is successfully updated, the status 被设为 PlaceSearchSuggestionModel.Ready , while if it unsuccessfully completes, the status 被设为 PlaceSearchSuggestionModel.Error and the model cleared.

This example shows use of the model

PlaceSeachSuggestionModel {
    id: model
    plugin: backendPlugin
    searchArea: QtPositioning.circle(QtPositioning.coordinate(10, 10))
    ...
}
MouseArea {
    ...
    onClicked: {
        model.searchTerm = "piz"
        model.searchArea.center.latitude = -27.5;
        model.searchArea.cetner.longitude = 153;
        model.update();
    }
}

A more detailed example can be found in the in Places (QML) 范例。

另请参阅 cancel() and status .