- Qt 5.5
- Qt Sensors
- Qt Sensors - C++ Sensor Gestures Example
- mainwindow.cpp Example File
- Qt 5.5.1 Reference Documentation

# mainwindow.cpp Example File

sensorgestures/mainwindow.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the QtSensors module of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:BSD$
    ** You may use this file under the terms of the BSD license as follows:
    **
    ** "Redistribution and use in source and binary forms, with or without
    ** modification, are permitted provided that the following conditions are
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    **   * Redistributions of source code must retain the above copyright
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    **     contributors may be used to endorse or promote products derived
    **     from this software without specific prior written permission.
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    #include <QtCore/QDebug>
    #include <QtWidgets/QTreeWidget>

    #include "mainwindow.h"
    #include "ui_mainwindow.h"

    #include <qsensorgesture.h>
    #include <qsensorgesturemanager.h>

    MainWindow::MainWindow(QWidget *parent)
        : QMainWindow(parent),
          ui(new Ui::MainWindow)
    {
        ui->setupUi(this);

        QSensorGestureManager manager;

        Q_FOREACH (const QString &gesture, manager.gestureIds()) {

            QTreeWidgetItem *gestureId = new QTreeWidgetItem(ui->treeWidget);
            QStringList recognizerSignals =  manager.recognizerSignals(gesture);
            gestureId->setText(0,gesture);

            for (int i = 0; i < recognizerSignals.count(); i++) {
                QTreeWidgetItem *oneSignal = new QTreeWidgetItem(gestureId);
                oneSignal->setText(0,recognizerSignals.at(i));
            }
            ui->treeWidget->insertTopLevelItem(0,gestureId);
        }

        ui->textEdit->setReadOnly(true);
    }

    MainWindow::~MainWindow()
    {
        delete ui;
    }

    void MainWindow::detectedShake(const QString &name)
    {
        QString str = "<font size=+2><B>"+name+"</b></font><br>";
        ui->textEdit->insertHtml(str);
        ui->textEdit->ensureCursorVisible();
    }

    void MainWindow::on_pushButton_clicked()
    {
        ui->textEdit->clear();
    }

    void MainWindow::onShake()
    {
        QString str = "<font size=+2><B>onShake()</b></font><br>";
        ui->textEdit->insertHtml(str);
        ui->textEdit->ensureCursorVisible();
    }

    void MainWindow::on_startPushButton_clicked()
    {
        if (ui->treeWidget->currentItem() == 0)
                return;
        QString currentRecognizer;

        if (ui->treeWidget->currentItem()->childCount() == 0) {
            currentRecognizer = ui->treeWidget->currentItem()->parent()->text(0);
        } else {
            currentRecognizer = ui->treeWidget->currentItem()->text(0);
        }

        if (recognizerMap.contains(currentRecognizer))
            return;
        QSensorGestureManager manager;
        QSensorGesture *thisGesture = new QSensorGesture(QStringList() << currentRecognizer, this);

        if (currentRecognizer.contains("QtSensors.shake")) {
            connect(thisGesture,SIGNAL(shake()),
                    this,SLOT(onShake()));
        }

        connect(thisGesture,SIGNAL(detected(QString)),
                this,SLOT(detectedShake(QString)));
        thisGesture->startDetection();

        recognizerMap.insert(currentRecognizer,thisGesture);

        QString str = QString("<font size=+2><B>Started %1</b></font><br>").arg(currentRecognizer);
        ui->textEdit->insertHtml(str);
        ui->textEdit->ensureCursorVisible();
    }

    void MainWindow::on_stopPushButton_clicked()
    {
        if (ui->treeWidget->currentItem() == 0)
                return;
        QString currentRecognizer;

        if (ui->treeWidget->currentItem()->childCount() == 0) {
            currentRecognizer = ui->treeWidget->currentItem()->parent()->text(0);
        } else {
            currentRecognizer = ui->treeWidget->currentItem()->text(0);
        }

        if (!recognizerMap.contains(currentRecognizer))
            return;

            recognizerMap[currentRecognizer]->stopDetection();

            if (currentRecognizer == "QtSensors.shake") {
                disconnect(recognizerMap[currentRecognizer],SIGNAL(shake()),
                           this,SLOT(onShake()));
            }
            disconnect(recognizerMap[currentRecognizer],SIGNAL(detected(QString)),
                       this,SLOT(detectedShake(QString)));

            recognizerMap.take(currentRecognizer);

        QString str = QString("<font size=+2><B>Stopped %1</b></font><br>").arg(currentRecognizer);
        ui->textEdit->insertHtml(str);
        ui->textEdit->ensureCursorVisible();
    }