Qt Quick コントロール - チャットチュートリアル

#include <QGuiApplication>
#include <QQmlApplicationEngine>

int main(int argc, char *argv[])
{
    QGuiApplication app(argc, argv);

    QQmlApplicationEngine engine;
    engine.loadFromModule("chattutorial", "Main");

    return app.exec();
}

import QtQuick
import QtQuick.Controls

ApplicationWindow {
    width: 540
    height: 960
    visible: true
    ...
}

    Page {
        anchors.fill: parent
        header: Label {
            padding: 10
            text: qsTr("Contacts")
            font.pixelSize: 20
            horizontalAlignment: Text.AlignHCenter
            verticalAlignment: Text.AlignVCenter
        }
    }

        ...

        ListView {
            id: listView
            anchors.fill: parent
            topMargin: 48
            leftMargin: 48
            bottomMargin: 48
            rightMargin: 48
            spacing: 20
            model: ["Albert Einstein", "Ernest Hemingway", "Hans Gude"]
            delegate: ItemDelegate {
                id: contactDelegate
                text: modelData
                width: listView.width - listView.leftMargin - listView.rightMargin
                height: avatar.implicitHeight
                leftPadding: avatar.implicitWidth + 32

                required property string modelData

                Image {
                    id: avatar
                    source: "images/" + contactDelegate.modelData.replace(" ", "_") + ".png"
                }
            }
        }
        ...

import QtQuick.Controls

ApplicationWindow {
    id: window
    width: 540
    height: 960
    visible: true

    StackView {
        id: stackView
        anchors.fill: parent
        initialItem: ContactPage {}
    }
}

width: ListView.view.width - ListView.view.leftMargin - ListView.view.rightMargin

    header: ToolBar {
        Label {
            text: qsTr("Contacts")
            font.pixelSize: 20
            anchors.centerIn: parent
        }
    }

            onClicked: root.StackView.view.push("ConversationPage.qml", { inConversationWith: modelData })

import QtQuick
import QtQuick.Layouts
import QtQuick.Controls

Page {
    id: root

    property string inConversationWith

    header: ToolBar {
        ToolButton {
            text: qsTr("Back")
            anchors.left: parent.left
            anchors.leftMargin: 10
            anchors.verticalCenter: parent.verticalCenter
            onClicked: root.StackView.view.pop()
        }

        Label {
            id: pageTitle
            text: root.inConversationWith
            font.pixelSize: 20
            anchors.centerIn: parent
        }
    }
    ...

    ColumnLayout {
        anchors.fill: parent

        ListView {
            id: listView
            Layout.fillWidth: true
            Layout.fillHeight: true
            ...

        }
        ...

        Pane {
            id: pane
            Layout.fillWidth: true
            ...
    }

        ListView {
            id: listView
            Layout.fillWidth: true
            Layout.fillHeight: true
            Layout.margins: pane.leftPadding + messageField.leftPadding
            displayMarginBeginning: 40
            displayMarginEnd: 40
            verticalLayoutDirection: ListView.BottomToTop
            spacing: 12
            model: 10
            delegate: Row {
                id: messageDelegate
                anchors.right: sentByMe ? listView.contentItem.right : undefined
                spacing: 6

                required property int index
                readonly property bool sentByMe: index % 2 == 0

                Rectangle {
                    id: avatar
                    width: height
                    height: parent.height
                    color: "grey"
                    visible: !messageDelegate.sentByMe
                }

                Rectangle {
                    width: 80
                    height: 40
                    color: messageDelegate.sentByMe ? "lightgrey" : "steelblue"

                    Label {
                        anchors.centerIn: parent
                        text: messageDelegate.index
                        color: messageDelegate.sentByMe ? "black" : "white"
                    }
                }
            }

            ScrollBar.vertical: ScrollBar {}
        }

        Pane {
            id: pane
            Layout.fillWidth: true
            Layout.fillHeight: false

            RowLayout {
                width: parent.width

                TextArea {
                    id: messageField
                    Layout.fillWidth: true
                    placeholderText: qsTr("Compose message")
                    wrapMode: TextArea.Wrap
                }

                Button {
                    id: sendButton
                    text: qsTr("Send")
                    enabled: messageField.length > 0
                    Layout.fillWidth: false
                }
            }
        }

#include <QQmlEngine>
#include <QSqlQueryModel>

class SqlContactModel : public QSqlQueryModel
{
    Q_OBJECT
    QML_ELEMENT

public:
    SqlContactModel(QObject *parent = nullptr);
};

#include "sqlcontactmodel.h"

#include <QDebug>
#include <QSqlError>
#include <QSqlQuery>

static voidcreateTable()
{
    if(QSqlDatabase::database().tables().contains(QStringLiteral("Contacts"))) {
        // テーブルはすでに存在するため、何もする必要はありません。
        return;
    }

    QSqlQuery query;
   if(!query.exec(
        "CREATE TABLE IF NOT EXISTS 'Contacts' ("
        "   'name' TEXT NOT NULL,"
        "   PRIMARY KEY(name)"
        ")")) {
        qFatal("Failed to query database: %s", qPrintable(query.lastError().text()));
    }

    query.exec("INSERT INTO Contacts VALUES('Albert Einstein')");
    query.exec("INSERT INTO Contacts VALUES('Ernest Hemingway')");
    query.exec("INSERT INTO Contacts VALUES('Hans Gude')");
}

SqlContactModel::SqlContactModel(QObject*parent) :
    QSqlQueryModel(parent)
{
    createTable();

    QSqlQuery query;
    if(!query.exec("SELECT * FROM Contacts"))
        qFatal("Contacts SELECT query failed: %s", qPrintable(query.lastError().text()));

    setQuery(std::move(query));
    if(lastError().isValid())
        qFatal("Cannot set query on SqlContactModel: %s", qPrintable(lastError().text()));
}

#include <QQmlEngine>
#include <QSqlTableModel>

class SqlConversationModel : public QSqlTableModel
{
    Q_OBJECT
    QML_ELEMENT
    Q_PROPERTY(QString recipient READ recipient WRITE setRecipient NOTIFY recipientChanged)

public:
    SqlConversationModel(QObject *parent = nullptr);

    QString recipient() const;
    void setRecipient(const QString &recipient);

    QVariant data(const QModelIndex &index, int role) const override;
    QHash<int, QByteArray> roleNames() const override;

    Q_INVOKABLE void sendMessage(const QString &recipient, const QString &message);

signals:
    void recipientChanged();

private:
    QString m_recipient;
};

#include "sqlconversationmodel.h"

#include <QDateTime>
#include <QDebug>
#include <QSqlError>
#include <QSqlRecord>
#include <QSqlQuery>

static const char *conversationsTableName = "Conversations";

static voidcreateTable()
{
    if(QSqlDatabase::database().tables().contains(conversationsTableName)) {
        // テーブルはすでに存在するため、何もする必要はありません。
        return;
    }

    QSqlQuery query;
    if(!query.exec(
        "CREATE TABLE IF NOT EXISTS 'Conversations' ("
        "'author' TEXT NOT NULL,"
        "'recipient' TEXT NOT NULL,"
       "'timestamp' TEXT NOT NULL,"
        "'message' TEXT NOT NULL,"
        "FOREIGN KEY('author') REFERENCES Contacts ( name ),"
       "FOREIGN KEY('recipient') REFERENCES Contacts ( name )"
        ")")) {
        qFatal("Failed to query database: %s", qPrintable(query.lastError().text()));
    }

    query.exec("INSERT INTO Conversations VALUES('Me', 'Ernest Hemingway', '2016-01-07T14:36:06', 'Hello!')");
    query.exec("INSERT INTO Conversations VALUES('アーネスト・ヘミングウェイ', '私', '2016-01-07T14:36:16', 'こんにちは。')");
    query.exec("INSERT INTO Conversations VALUES('Me', 'Albert Einstein', '2016-01-01T11:24:53', 'Hi!')");
    query.exec("INSERT INTO Conversations VALUES('Albert Einstein', 'Me', '2016-01-07T14:36:16', 'Good morning.')");
    query.exec("INSERT INTO Conversations VALUES('ハンス・グード', '私', '2015-11-20T06:30:02', 'おはよう。私の絵は届きましたか？')");
    query.exec("INSERT INTO Conversations VALUES('Me', 'Hans Gude', '2015-11-20T08:21:03', 'おはよう、ハンス。ええ、とても素敵ですね。 本当にありがとう！ "
               "それには何時間かかったの？')");
}

SqlConversationModel::SqlConversationModel(QObject *parent) :
    QSqlTableModel(parent)
{
    createTable();
    setTable(conversationsTableName);
    setSort(2, Qt::DescendingOrder);
    // Ensures that the model is sorted correctly after submitting a new row.
    setEditStrategy(QSqlTableModel::OnManualSubmit);
}

QString SqlConversationModel::recipient() const
{
    return m_recipient;
}

void SqlConversationModel::setRecipient(const QString &recipient)
{
    if (recipient == m_recipient)
        return;

    m_recipient = recipient;

    const QString filterString = QString::fromLatin1(
        "(recipient = '%1' AND author = 'Me') OR (recipient = 'Me' AND author='%1')").arg(m_recipient);
    setFilter(filterString);
    select();

    emit recipientChanged();
}

QVariant SqlConversationModel::data(const QModelIndex &index, int role) const
{
    if (role < Qt::UserRole)
        return QSqlTableModel::data(index, role);

    const QSqlRecord sqlRecord = record(index.row());
    return sqlRecord.value(role - Qt::UserRole);
}

QHash<int, QByteArray> SqlConversationModel::roleNames() const
{
    QHash<int, QByteArray> names;
    names[Qt::UserRole] = "author";
    names[Qt::UserRole + 1] = "recipient";
    names[Qt::UserRole + 2] = "timestamp";
    names[Qt::UserRole + 3] = "message";
    return names;
}

voidSqlConversationModel::sendMessage(constQString&recipient, constQString&message)
{
    constQString timestamp=QDateTime::currentDateTime().toString(Qt::ISODate);

    QSqlRecord newRecord=record();
    newRecord.setValue("author", "Me");
    newRecord.setValue("recipient",recipient);
    newRecord.setValue("timestamp",timestamp);
    newRecord.setValue("message",message);
   if(!insertRecord(rowCount(),newRecord)) {
        qWarning() << "Failed to send message:" << lastError().text();
       return;
    }

#include <QtCore>
#include <QGuiApplication>
#include <QSqlDatabase>
#include <QSqlError>
#include <QtQml>

static voidconnectToDatabase()
{
    QSqlDatabase database=QSqlDatabase::database();
    if(!database.isValid()) {
        database=QSqlDatabase::addDatabase("QSQLITE");
        if(!database.isValid())
            qFatal("Cannot add database: %s", qPrintable(database.lastError().text()));
    }

    constQDir writeDir=QStandardPaths::writableLocation(QStandardPaths::AppDataLocation);
    if(!writeDir.mkpath("."))
        qFatal("Failed to create writable directory at %s", qPrintable(writeDir.absolutePath()));

   // すべてのデバイスに書き込み可能な場所があることを確認する。
    constQString fileName=writeDir.absolutePath()+ "/chat-database.sqlite3";
   // SQLite ドライバを使用する場合、open() は SQLite データベースが存在しない場合にそれを作成します。
   database.setDatabaseName(fileName);
    if(!database.open()) {
        qFatal("Cannot open database: %s", qPrintable(database.lastError().text()));
        QFile::remove(fileName);
    }
}

intmain(intargc, char *argv[])
{
    QGuiApplication app(argc,argv);

    connectToDatabase();

    QQmlApplicationEngine engine;
    engine.loadFromModule("chattutorial", "Main");
    if(engine.rootObjects().isEmpty())
        return-1;

    returnapp.exec();
}

import chattutorial

        model: SqlContactModel {}

            text: model.display

            model: SqlConversationModel {
                recipient: root.inConversationWith
            }

            delegate: Column {
                id: conversationDelegate
                anchors.right: sentByMe ? listView.contentItem.right : undefined
                spacing: 6

                required property string author
                required property string recipient
                required property date timestamp
                required property string message
                readonly property bool sentByMe: recipient !== "Me"

                Row {
                    id: messageRow
                    spacing: 6
                    anchors.right: conversationDelegate.sentByMe ? parent.right : undefined

                    Image {
                        id: avatar
                        source: !conversationDelegate.sentByMe
                            ? "images/" + conversationDelegate.author.replace(" ", "_") + ".png" : ""
                    }

                    Rectangle {
                        width: Math.min(messageText.implicitWidth + 24,
                            listView.width - (!conversationDelegate.sentByMe ? avatar.width + messageRow.spacing : 0))
                        height: messageText.implicitHeight + 24
                        color: conversationDelegate.sentByMe ? "lightgrey" : "steelblue"

                        Label {
                            id: messageText
                            text: conversationDelegate.message
                            color: conversationDelegate.sentByMe ? "black" : "white"
                            anchors.fill: parent
                            anchors.margins: 12
                            wrapMode: Label.Wrap
                        }
                    }
                }

                Label {
                    id: timestampText
                    text: Qt.formatDateTime(conversationDelegate.timestamp, "d MMM hh:mm")
                    color: "lightgrey"
                    anchors.right: conversationDelegate.sentByMe ? parent.right : undefined
                }
            }

                Button {
                    id: sendButton
                    text: qsTr("Send")
                    enabled: messageField.length > 0
                    Layout.fillWidth: false
                    onClicked: {
                        listView.model.sendMessage(root.inConversationWith, messageField.text)
                        messageField.text = ""
                    }
                }

import QtQuick.Controls.Material 2.12

// ...

header: ToolBar {
    Material.theme: Material.Dark

    // ...
}

import QtQuick.Controls

ToolBar {
}

    header: ChatToolBar {
        Label {
            text: qsTr("Contacts")
            font.pixelSize: 20
            anchors.centerIn: parent
        }
    }

import QtQuick.Controls
import QtQuick.Controls.Material

ToolBar {
    Material.theme: Material.Dark
}

    header: ChatToolBar {
        ToolButton {
            text: qsTr("Back")
            anchors.left: parent.left
            anchors.leftMargin: 10
            anchors.verticalCenter: parent.verticalCenter
            onClicked: root.StackView.view.pop()
        }

        Label {
            id: pageTitle
            text: root.inConversationWith
            font.pixelSize: 20
            anchors.centerIn: parent
        }
    }

[Material]
Primary=Indigo
Accent=Indigo
Theme=Dark

[universal]
Theme=Dark