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vk.com api Qt wrapper

// repository documentation

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## About

Vreen is extensible Qt-based asynchronious vk.com api library.

[![Build Status](https://travis-ci.org/alekseysidorov/vreen.svg?branch=master)](https://travis-ci.org/alekseysidorov/vreen)

## Dependencies

* C++11 compliant compiler
* Qt 5.2.0 - http://qt.io
* Cmake 3.0 - http://cmake.org

## Compiling

```bash
    mkdir build
    cmake ..
    make
```

As alternative you can use cmake build system.

## Usage

### From C++

```c++
PhoneFetcher::PhoneFetcher(QObject *parent) :
    Vreen::Client(parent)
{
    auto auth = new Vreen::OAuthConnection(3220807, this);
    auth->setConnectionOption(Vreen::Connection::ShowAuthDialog, true);
    auth->setConnectionOption(Vreen::Connection::KeepAuthData, true);
    setConnection(auth);

connect(this, &PhoneFetcher::onlineStateChanged, this, &PhoneFetcher::onOnlineChanged);
    connect(roster(), &Vreen::Roster::syncFinished, this, &PhoneFetcher::onSynced);
}

void PhoneFetcher::fetch()
{
    connectToHost();
}

void PhoneFetcher::onOnlineChanged(bool online)
{
    if (online) {
        auto fields = {
            QStringLiteral("first_name"),
            QStringLiteral("last_name"),
            QStringLiteral("contacts")
        };
        roster()->sync(fields);
    }
}

void PhoneFetcher::onSynced(bool success)
{
    if (success) {
        qDebug() << tr("-- %1 contacts recieved").arg(roster()->buddies().count());
        for (const auto &buddy : roster()->buddies()) {
            qDebug() << tr("name: %1, home: %2, mobile: %3").arg(buddy->name())
                        .arg(buddy->homePhone().isEmpty() ? tr("unknown") : buddy->homePhone())
                        .arg(buddy->mobilePhone().isEmpty() ? tr("unknown") : buddy->mobilePhone());
        }
    }
    qApp->quit();
}
```
See [phonefetcher](examples/cpp/phonefetcher/) example for details

### From QML

```qml
import QtQuick 2.0
import Vreen.Base 2.0

Rectangle {
    id: root

width: 500
    height: 800

TextEdit {
        id: login

onLinkActivated: client.connectToHost()

z: 10
        anchors.centerIn: parent
        text: qsTr("<a href=\"http://vk.com\">Click to login</a>")
        textFormat: TextEdit.RichText
    }

DialogsModel {
        id: dialogsModel
        client: client
    }

Client {
        id: client
        connection: conn
    }

OAuthConnection {
        id: conn

Component.onCompleted: {
            setConnectionOption(Connection.ShowAuthDialog, true);
            setConnectionOption(Connection.KeepAuthData, true);
        }

clientId: 3220807
        displayType: OAuthConnection.Popup
    }

ListView {
        id: dialogsView

anchors.fill: parent
        scale: 0
        model: dialogsModel

header: Text {
            width: parent.width
            height: 50
            text: qsTr("Last dialogs")
            font.bold: true
            font.pixelSize: login.font.pixelSize * 1.1
            horizontalAlignment: Qt.AlignHCenter
            verticalAlignment: Qt.AlignVCenter
        }

delegate: Rectangle {
            id: item

property QtObject contact: incoming ? from : to;

Component.onCompleted: {
                from.update();
                to.update();
            }

width: parent.width
            height: 120
            color: index % 2 ? syspal.alternateBase : "transparent"

Image {
                id: preview

width: 75
                height: Math.min(sourceSize.height, 75)

source: contact.photoSource
                fillMode: Image.PreserveAspectFit
                clip: true
                smooth: true

anchors {
                    left: parent.left
                    leftMargin: 5
                    top: column.top
                }
            }

Column {
                id: column

spacing: 2

anchors {
                    left: preview.right
                    top: parent.top
                    right: parent.right
                    bottom: parent.bottom
                    leftMargin: 10
                    rightMargin: 10
                    topMargin: 10
                }

Text {
                    id: titleLabel
                    width: parent.width
                    font.bold: true
                    text: qsTr("%1 ➜ %2 %3").arg(from.name).arg(to.name).arg(chatId ? qsTr("(from chat)") : "")
                    elide: Text.ElideRight
                    wrapMode: Text.Wrap
                    maximumLineCount: 1
                }
                Text {
                    id: descriptionLabel
                    width: parent.width
                    text: body
                    elide: Text.ElideRight
                    wrapMode: Text.Wrap
                    maximumLineCount: 3
                }
            }

Text {
                id: dateLabel

color: syspal.dark
                font.pixelSize: login.font.pixelSize * 0.8

anchors {
                    bottom: hr.top
                    bottomMargin: 3
                    left: column.left
                }
                text: {
                    var info = Qt.formatDateTime(date, qsTr("dddd in hh:mm"));
                    if (unread)
                        info += qsTr(", unread");
                    if (Object.keys(attachments).length > 0)
                        info += qsTr(", has attachments")
                    return info;
                }
            }

Rectangle {
                id: hr
                width: parent.width
                height: 1
                anchors.bottom: parent.bottom
                color: syspal.window
            }
        }

ScrollDecorator {
            flickableItem: parent
        }
    }

SystemPalette {
        id: syspal
    }

Connections {
        target: client

onOnlineChanged: {
            if (client.online) {
                client.roster.sync();
                dialogsModel.getDialogs(10, 0, 160);
            }
        }
    }

states: [
        State {
            name: "online"
            when: client.online
            PropertyChanges {
                target: login
                scale: 0
            }
            PropertyChanges {
                target: dialogsView
                scale: 1
            }
        }
    ]
    transitions: [
        Transition {
            from: "*"
            to: "online"
            NumberAnimation { target: dialogsView; property: "scale"; duration: 400; easing.type: Easing.InOutQuad }
            NumberAnimation { target: login; property: "scale"; duration: 400; easing.type: Easing.InOutQuad }
        }
    ]
}
```

See [dialogs](examples/quick/dialogs/) example for details

## TODO

* Use system browser to receive auth token instead webkit page
* Use more modern C++ features for simplify api
* Add cmake support
* Add qmake project file for Android

vreen

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