Time Client Application

A client who holds a replica of a time object from a server and displays the time in a clock.

The Time Client Application opens a blue window with a message. When you click once, it displays a clock. When you click again, two clocks, then it repeats. The clock is defined in Clock.qml and uses the 时间 QML-type, implemented in C++, to set the time of the clock using the time on the server.

Before Running the Time Client Application

To run this example, Time Server Application must already be running on the same host as this application. It sets up a registry server and hosts an instance of a subclass of the MinuteTimerSimpleSource class. If it is not running, there will be an error message in the window.

Defining Remote Objects using a REP-file

The REP-file "timemodel.rep" in the parent directory of this application is used to generate the header-files used by both applications. For this application, the generated "rep_timemodel_replica.h" file defines MinuteTimerReplica , the replica of MinuteTimer , and other related classes.

The TimeModel Class

The TimeModel class in plugin.h and plugin.cpp implements the QML-type 时间 . It contacts the registry server on localhost using the URL "local:registry", acquires a replica, MinuteTimerReplica , and connects to its signals. The properties are automatically updated.

The QML Types

The QML defined in "Clock.qml" draws a watch using the properties hours and minutes.

The application opens a window with the contents "plugins.qml". It changes between displaying different content using a Loader, cycling for each click between "plugins0.qml", "plugins1.qml", and "plugins2.qml".

While "plugins0.qml" displays a blue screen with a message, the custom QML-type Clock is used in "plugins1.qml", with the properties hours and minutes set to the hour and minute properties of 时间 . The "plugins2.qml" file is similar but displays two clocks.

import QtRemoteObjects
import QtQuick
import TimeExample // import types from the plugin
Rectangle {
    width: 200
    height: 400
    color: "blue"
    Clock {
        id: clock1
        anchors.top: parent.top
        Time { // this class is defined in C++
            id: time
            node: node
        }
        Node {
            id: node
            registryUrl: "local:registry"
        }
        hours: time.hour
        minutes: time.minute
        valid: time.state == Time.Valid
    }
}
					

范例工程 @ code.qt.io

另请参阅 Time Server Application .

内容

• Before Running the Time Client Application

• Defining Remote Objects using a REP-file

• The TimeModel Class

• The QML Types