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<h1 class="title">camera.cpp Example File</h1>
<span class="subtitle">multimediawidgets/camera/camera.cpp</span>
<!-- $$$multimediawidgets/camera/camera.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp">
<span class="comment">/****************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, 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
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
** contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="preprocessor">#include "camera.h"</span>
<span class="preprocessor">#include "ui_camera.h"</span>
<span class="preprocessor">#include "videosettings.h"</span>
<span class="preprocessor">#include "imagesettings.h"</span>
<span class="preprocessor">#include <QMediaService></span>
<span class="preprocessor">#include <QMediaRecorder></span>
<span class="preprocessor">#include <QCameraViewfinder></span>
<span class="preprocessor">#include <QCameraInfo></span>
<span class="preprocessor">#include <QMediaMetaData></span>
<span class="preprocessor">#include <QMessageBox></span>
<span class="preprocessor">#include <QPalette></span>
<span class="preprocessor">#include <QtWidgets></span>
Q_DECLARE_METATYPE(<span class="type"><a href="qcamerainfo.html">QCameraInfo</a></span>)
Camera<span class="operator">::</span>Camera(<span class="type">QWidget</span> <span class="operator">*</span>parent) :
<span class="type">QMainWindow</span>(parent)<span class="operator">,</span>
ui(<span class="keyword">new</span> Ui<span class="operator">::</span>Camera)
{
ui<span class="operator">-</span><span class="operator">></span>setupUi(<span class="keyword">this</span>);
<span class="comment">//Camera devices:</span>
<span class="type">QActionGroup</span> <span class="operator">*</span>videoDevicesGroup <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QActionGroup</span>(<span class="keyword">this</span>);
videoDevicesGroup<span class="operator">-</span><span class="operator">></span>setExclusive(<span class="keyword">true</span>);
<span class="keyword">const</span> <span class="type">QList</span><span class="operator"><</span><span class="type"><a href="qcamerainfo.html">QCameraInfo</a></span><span class="operator">></span> availableCameras <span class="operator">=</span> <span class="type"><a href="qcamerainfo.html">QCameraInfo</a></span><span class="operator">::</span>availableCameras();
<span class="keyword">for</span> (<span class="keyword">const</span> <span class="type"><a href="qcamerainfo.html">QCameraInfo</a></span> <span class="operator">&</span>cameraInfo : availableCameras) {
<span class="type">QAction</span> <span class="operator">*</span>videoDeviceAction <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QAction</span>(cameraInfo<span class="operator">.</span>description()<span class="operator">,</span> videoDevicesGroup);
videoDeviceAction<span class="operator">-</span><span class="operator">></span>setCheckable(<span class="keyword">true</span>);
videoDeviceAction<span class="operator">-</span><span class="operator">></span>setData(<span class="type">QVariant</span><span class="operator">::</span>fromValue(cameraInfo));
<span class="keyword">if</span> (cameraInfo <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qcamerainfo.html">QCameraInfo</a></span><span class="operator">::</span>defaultCamera())
videoDeviceAction<span class="operator">-</span><span class="operator">></span>setChecked(<span class="keyword">true</span>);
ui<span class="operator">-</span><span class="operator">></span>menuDevices<span class="operator">-</span><span class="operator">></span>addAction(videoDeviceAction);
}
connect(videoDevicesGroup<span class="operator">,</span> <span class="operator">&</span><span class="type">QActionGroup</span><span class="operator">::</span>triggered<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>Camera<span class="operator">::</span>updateCameraDevice);
connect(ui<span class="operator">-</span><span class="operator">></span>captureWidget<span class="operator">,</span> <span class="operator">&</span><span class="type">QTabWidget</span><span class="operator">::</span>currentChanged<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>Camera<span class="operator">::</span>updateCaptureMode);
setCamera(<span class="type"><a href="qcamerainfo.html">QCameraInfo</a></span><span class="operator">::</span>defaultCamera());
}
Camera<span class="operator">::</span><span class="operator">~</span>Camera()
{
<span class="keyword">delete</span> mediaRecorder;
<span class="keyword">delete</span> imageCapture;
<span class="keyword">delete</span> camera;
}
<span class="type">void</span> Camera<span class="operator">::</span>setCamera(<span class="keyword">const</span> <span class="type"><a href="qcamerainfo.html">QCameraInfo</a></span> <span class="operator">&</span>cameraInfo)
{
<span class="keyword">delete</span> imageCapture;
<span class="keyword">delete</span> mediaRecorder;
<span class="keyword">delete</span> camera;
camera <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qcamera.html">QCamera</a></span>(cameraInfo);
connect(camera<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qcamera.html">QCamera</a></span><span class="operator">::</span>stateChanged<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>Camera<span class="operator">::</span>updateCameraState);
connect(camera<span class="operator">,</span> <span class="type">QOverload</span><span class="operator"><</span><span class="type"><a href="qcamera.html">QCamera</a></span><span class="operator">::</span>Error<span class="operator">></span><span class="operator">::</span>of(<span class="operator">&</span><span class="type"><a href="qcamera.html">QCamera</a></span><span class="operator">::</span>error)<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>Camera<span class="operator">::</span>displayCameraError);
mediaRecorder <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qmediarecorder.html">QMediaRecorder</a></span>(camera);
connect(mediaRecorder<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qmediarecorder.html">QMediaRecorder</a></span><span class="operator">::</span>stateChanged<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>Camera<span class="operator">::</span>updateRecorderState);
imageCapture <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qcameraimagecapture.html">QCameraImageCapture</a></span>(camera);
connect(mediaRecorder<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qmediarecorder.html">QMediaRecorder</a></span><span class="operator">::</span>durationChanged<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>Camera<span class="operator">::</span>updateRecordTime);
connect(mediaRecorder<span class="operator">,</span> <span class="type">QOverload</span><span class="operator"><</span><span class="type"><a href="qmediarecorder.html">QMediaRecorder</a></span><span class="operator">::</span>Error<span class="operator">></span><span class="operator">::</span>of(<span class="operator">&</span><span class="type"><a href="qmediarecorder.html">QMediaRecorder</a></span><span class="operator">::</span>error)<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>Camera<span class="operator">::</span>displayRecorderError);
mediaRecorder<span class="operator">-</span><span class="operator">></span>setMetaData(<span class="type"><a href="qmediametadata.html">QMediaMetaData</a></span><span class="operator">::</span>Title<span class="operator">,</span> <span class="type">QVariant</span>(QLatin1String(<span class="string">"Test Title"</span>)));
connect(ui<span class="operator">-</span><span class="operator">></span>exposureCompensation<span class="operator">,</span> <span class="operator">&</span><span class="type">QAbstractSlider</span><span class="operator">::</span>valueChanged<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>Camera<span class="operator">::</span>setExposureCompensation);
camera<span class="operator">-</span><span class="operator">></span>setViewfinder(ui<span class="operator">-</span><span class="operator">></span>viewfinder);
updateCameraState(camera<span class="operator">-</span><span class="operator">></span>state());
updateLockStatus(camera<span class="operator">-</span><span class="operator">></span>lockStatus()<span class="operator">,</span> <span class="type"><a href="qcamera.html">QCamera</a></span><span class="operator">::</span>UserRequest);
updateRecorderState(mediaRecorder<span class="operator">-</span><span class="operator">></span>state());
connect(imageCapture<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qcameraimagecapture.html">QCameraImageCapture</a></span><span class="operator">::</span>readyForCaptureChanged<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>Camera<span class="operator">::</span>readyForCapture);
connect(imageCapture<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qcameraimagecapture.html">QCameraImageCapture</a></span><span class="operator">::</span>imageCaptured<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>Camera<span class="operator">::</span>processCapturedImage);
connect(imageCapture<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qcameraimagecapture.html">QCameraImageCapture</a></span><span class="operator">::</span>imageSaved<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>Camera<span class="operator">::</span>imageSaved);
connect(imageCapture<span class="operator">,</span> <span class="type">QOverload</span><span class="operator"><</span><span class="type">int</span><span class="operator">,</span> <span class="type"><a href="qcameraimagecapture.html">QCameraImageCapture</a></span><span class="operator">::</span>Error<span class="operator">,</span> <span class="keyword">const</span> <span class="type">QString</span> <span class="operator">&</span><span class="operator">></span><span class="operator">::</span>of(<span class="operator">&</span><span class="type"><a href="qcameraimagecapture.html">QCameraImageCapture</a></span><span class="operator">::</span>error)<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>Camera<span class="operator">::</span>displayCaptureError);
connect(camera<span class="operator">,</span> <span class="type">QOverload</span><span class="operator"><</span><span class="type"><a href="qcamera.html">QCamera</a></span><span class="operator">::</span>LockStatus<span class="operator">,</span> <span class="type"><a href="qcamera.html">QCamera</a></span><span class="operator">::</span>LockChangeReason<span class="operator">></span><span class="operator">::</span>of(<span class="operator">&</span><span class="type"><a href="qcamera.html">QCamera</a></span><span class="operator">::</span>lockStatusChanged)<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>Camera<span class="operator">::</span>updateLockStatus);
ui<span class="operator">-</span><span class="operator">></span>captureWidget<span class="operator">-</span><span class="operator">></span>setTabEnabled(<span class="number">0</span><span class="operator">,</span> (camera<span class="operator">-</span><span class="operator">></span>isCaptureModeSupported(<span class="type"><a href="qcamera.html">QCamera</a></span><span class="operator">::</span>CaptureStillImage)));
ui<span class="operator">-</span><span class="operator">></span>captureWidget<span class="operator">-</span><span class="operator">></span>setTabEnabled(<span class="number">1</span><span class="operator">,</span> (camera<span class="operator">-</span><span class="operator">></span>isCaptureModeSupported(<span class="type"><a href="qcamera.html">QCamera</a></span><span class="operator">::</span>CaptureVideo)));
updateCaptureMode();
camera<span class="operator">-</span><span class="operator">></span>start();
}
<span class="type">void</span> Camera<span class="operator">::</span>keyPressEvent(<span class="type">QKeyEvent</span> <span class="operator">*</span> event)
{
<span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>isAutoRepeat())
<span class="keyword">return</span>;
<span class="keyword">switch</span> (event<span class="operator">-</span><span class="operator">></span>key()) {
<span class="keyword">case</span> <span class="type">Qt</span><span class="operator">::</span>Key_CameraFocus:
displayViewfinder();
camera<span class="operator">-</span><span class="operator">></span>searchAndLock();
event<span class="operator">-</span><span class="operator">></span>accept();
<span class="keyword">break</span>;
<span class="keyword">case</span> <span class="type">Qt</span><span class="operator">::</span>Key_Camera:
<span class="keyword">if</span> (camera<span class="operator">-</span><span class="operator">></span>captureMode() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qcamera.html">QCamera</a></span><span class="operator">::</span>CaptureStillImage) {
takeImage();
} <span class="keyword">else</span> {
<span class="keyword">if</span> (mediaRecorder<span class="operator">-</span><span class="operator">></span>state() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qmediarecorder.html">QMediaRecorder</a></span><span class="operator">::</span>RecordingState)
stop();
<span class="keyword">else</span>
record();
}
event<span class="operator">-</span><span class="operator">></span>accept();
<span class="keyword">break</span>;
<span class="keyword">default</span>:
<span class="type">QMainWindow</span><span class="operator">::</span>keyPressEvent(event);
}
}
<span class="type">void</span> Camera<span class="operator">::</span>keyReleaseEvent(<span class="type">QKeyEvent</span> <span class="operator">*</span>event)
{
<span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">></span>isAutoRepeat())
<span class="keyword">return</span>;
<span class="keyword">switch</span> (event<span class="operator">-</span><span class="operator">></span>key()) {
<span class="keyword">case</span> <span class="type">Qt</span><span class="operator">::</span>Key_CameraFocus:
camera<span class="operator">-</span><span class="operator">></span>unlock();
<span class="keyword">break</span>;
<span class="keyword">default</span>:
<span class="type">QMainWindow</span><span class="operator">::</span>keyReleaseEvent(event);
}
}
<span class="type">void</span> Camera<span class="operator">::</span>updateRecordTime()
{
<span class="type">QString</span> str <span class="operator">=</span> <span class="type">QString</span>(<span class="string">"Recorded %1 sec"</span>)<span class="operator">.</span>arg(mediaRecorder<span class="operator">-</span><span class="operator">></span>duration()<span class="operator">/</span><span class="number">1000</span>);
ui<span class="operator">-</span><span class="operator">></span>statusbar<span class="operator">-</span><span class="operator">></span>showMessage(str);
}
<span class="type">void</span> Camera<span class="operator">::</span>processCapturedImage(<span class="type">int</span> requestId<span class="operator">,</span> <span class="keyword">const</span> <span class="type">QImage</span><span class="operator">&</span> img)
{
Q_UNUSED(requestId);
<span class="type">QImage</span> scaledImage <span class="operator">=</span> img<span class="operator">.</span>scaled(ui<span class="operator">-</span><span class="operator">></span>viewfinder<span class="operator">-</span><span class="operator">></span>size()<span class="operator">,</span>
<span class="type">Qt</span><span class="operator">::</span>KeepAspectRatio<span class="operator">,</span>
<span class="type">Qt</span><span class="operator">::</span>SmoothTransformation);
ui<span class="operator">-</span><span class="operator">></span>lastImagePreviewLabel<span class="operator">-</span><span class="operator">></span>setPixmap(<span class="type">QPixmap</span><span class="operator">::</span>fromImage(scaledImage));
<span class="comment">// Display captured image for 4 seconds.</span>
displayCapturedImage();
<span class="type">QTimer</span><span class="operator">::</span>singleShot(<span class="number">4000</span><span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>Camera<span class="operator">::</span>displayViewfinder);
}
<span class="type">void</span> Camera<span class="operator">::</span>configureCaptureSettings()
{
<span class="keyword">switch</span> (camera<span class="operator">-</span><span class="operator">></span>captureMode()) {
<span class="keyword">case</span> <span class="type"><a href="qcamera.html">QCamera</a></span><span class="operator">::</span>CaptureStillImage:
configureImageSettings();
<span class="keyword">break</span>;
<span class="keyword">case</span> <span class="type"><a href="qcamera.html">QCamera</a></span><span class="operator">::</span>CaptureVideo:
configureVideoSettings();
<span class="keyword">break</span>;
<span class="keyword">default</span>:
<span class="keyword">break</span>;
}
}
<span class="type">void</span> Camera<span class="operator">::</span>configureVideoSettings()
{
VideoSettings settingsDialog(mediaRecorder);
settingsDialog<span class="operator">.</span>setWindowFlags(settingsDialog<span class="operator">.</span>windowFlags() <span class="operator">&</span> <span class="operator">~</span><span class="type">Qt</span><span class="operator">::</span>WindowContextHelpButtonHint);
settingsDialog<span class="operator">.</span>setAudioSettings(audioSettings);
settingsDialog<span class="operator">.</span>setVideoSettings(videoSettings);
settingsDialog<span class="operator">.</span>setFormat(videoContainerFormat);
<span class="keyword">if</span> (settingsDialog<span class="operator">.</span>exec()) {
audioSettings <span class="operator">=</span> settingsDialog<span class="operator">.</span>audioSettings();
videoSettings <span class="operator">=</span> settingsDialog<span class="operator">.</span>videoSettings();
videoContainerFormat <span class="operator">=</span> settingsDialog<span class="operator">.</span>format();
mediaRecorder<span class="operator">-</span><span class="operator">></span>setEncodingSettings(
audioSettings<span class="operator">,</span>
videoSettings<span class="operator">,</span>
videoContainerFormat);
}
}
<span class="type">void</span> Camera<span class="operator">::</span>configureImageSettings()
{
ImageSettings settingsDialog(imageCapture);
settingsDialog<span class="operator">.</span>setWindowFlags(settingsDialog<span class="operator">.</span>windowFlags() <span class="operator">&</span> <span class="operator">~</span><span class="type">Qt</span><span class="operator">::</span>WindowContextHelpButtonHint);
settingsDialog<span class="operator">.</span>setImageSettings(imageSettings);
<span class="keyword">if</span> (settingsDialog<span class="operator">.</span>exec()) {
imageSettings <span class="operator">=</span> settingsDialog<span class="operator">.</span>imageSettings();
imageCapture<span class="operator">-</span><span class="operator">></span>setEncodingSettings(imageSettings);
}
}
<span class="type">void</span> Camera<span class="operator">::</span>record()
{
mediaRecorder<span class="operator">-</span><span class="operator">></span>record();
updateRecordTime();
}
<span class="type">void</span> Camera<span class="operator">::</span>pause()
{
mediaRecorder<span class="operator">-</span><span class="operator">></span>pause();
}
<span class="type">void</span> Camera<span class="operator">::</span>stop()
{
mediaRecorder<span class="operator">-</span><span class="operator">></span>stop();
}
<span class="type">void</span> Camera<span class="operator">::</span>setMuted(bool muted)
{
mediaRecorder<span class="operator">-</span><span class="operator">></span>setMuted(muted);
}
<span class="type">void</span> Camera<span class="operator">::</span>toggleLock()
{
<span class="keyword">switch</span> (camera<span class="operator">-</span><span class="operator">></span>lockStatus()) {
<span class="keyword">case</span> <span class="type"><a href="qcamera.html">QCamera</a></span><span class="operator">::</span>Searching:
<span class="keyword">case</span> <span class="type"><a href="qcamera.html">QCamera</a></span><span class="operator">::</span>Locked:
camera<span class="operator">-</span><span class="operator">></span>unlock();
<span class="keyword">break</span>;
<span class="keyword">case</span> <span class="type"><a href="qcamera.html">QCamera</a></span><span class="operator">::</span>Unlocked:
camera<span class="operator">-</span><span class="operator">></span>searchAndLock();
}
}
<span class="type">void</span> Camera<span class="operator">::</span>updateLockStatus(<span class="type"><a href="qcamera.html">QCamera</a></span><span class="operator">::</span>LockStatus status<span class="operator">,</span> <span class="type"><a href="qcamera.html">QCamera</a></span><span class="operator">::</span>LockChangeReason reason)
{
<span class="type">QColor</span> indicationColor <span class="operator">=</span> <span class="type">Qt</span><span class="operator">::</span>black;
<span class="keyword">switch</span> (status) {
<span class="keyword">case</span> <span class="type"><a href="qcamera.html">QCamera</a></span><span class="operator">::</span>Searching:
indicationColor <span class="operator">=</span> <span class="type">Qt</span><span class="operator">::</span>yellow;
ui<span class="operator">-</span><span class="operator">></span>statusbar<span class="operator">-</span><span class="operator">></span>showMessage(tr(<span class="string">"Focusing..."</span>));
ui<span class="operator">-</span><span class="operator">></span>lockButton<span class="operator">-</span><span class="operator">></span>setText(tr(<span class="string">"Focusing..."</span>));
<span class="keyword">break</span>;
<span class="keyword">case</span> <span class="type"><a href="qcamera.html">QCamera</a></span><span class="operator">::</span>Locked:
indicationColor <span class="operator">=</span> <span class="type">Qt</span><span class="operator">::</span>darkGreen;
ui<span class="operator">-</span><span class="operator">></span>lockButton<span class="operator">-</span><span class="operator">></span>setText(tr(<span class="string">"Unlock"</span>));
ui<span class="operator">-</span><span class="operator">></span>statusbar<span class="operator">-</span><span class="operator">></span>showMessage(tr(<span class="string">"Focused"</span>)<span class="operator">,</span> <span class="number">2000</span>);
<span class="keyword">break</span>;
<span class="keyword">case</span> <span class="type"><a href="qcamera.html">QCamera</a></span><span class="operator">::</span>Unlocked:
indicationColor <span class="operator">=</span> reason <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qcamera.html">QCamera</a></span><span class="operator">::</span>LockFailed <span class="operator">?</span> <span class="type">Qt</span><span class="operator">::</span>red : <span class="type">Qt</span><span class="operator">::</span>black;
ui<span class="operator">-</span><span class="operator">></span>lockButton<span class="operator">-</span><span class="operator">></span>setText(tr(<span class="string">"Focus"</span>));
<span class="keyword">if</span> (reason <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qcamera.html">QCamera</a></span><span class="operator">::</span>LockFailed)
ui<span class="operator">-</span><span class="operator">></span>statusbar<span class="operator">-</span><span class="operator">></span>showMessage(tr(<span class="string">"Focus Failed"</span>)<span class="operator">,</span> <span class="number">2000</span>);
}
<span class="type">QPalette</span> palette <span class="operator">=</span> ui<span class="operator">-</span><span class="operator">></span>lockButton<span class="operator">-</span><span class="operator">></span>palette();
palette<span class="operator">.</span>setColor(<span class="type">QPalette</span><span class="operator">::</span>ButtonText<span class="operator">,</span> indicationColor);
ui<span class="operator">-</span><span class="operator">></span>lockButton<span class="operator">-</span><span class="operator">></span>setPalette(palette);
}
<span class="type">void</span> Camera<span class="operator">::</span>takeImage()
{
isCapturingImage <span class="operator">=</span> <span class="keyword">true</span>;
imageCapture<span class="operator">-</span><span class="operator">></span>capture();
}
<span class="type">void</span> Camera<span class="operator">::</span>displayCaptureError(<span class="type">int</span> id<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="qcameraimagecapture.html">QCameraImageCapture</a></span><span class="operator">::</span>Error error<span class="operator">,</span> <span class="keyword">const</span> <span class="type">QString</span> <span class="operator">&</span>errorString)
{
Q_UNUSED(id);
Q_UNUSED(error);
<span class="type">QMessageBox</span><span class="operator">::</span>warning(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">"Image Capture Error"</span>)<span class="operator">,</span> errorString);
isCapturingImage <span class="operator">=</span> <span class="keyword">false</span>;
}
<span class="type">void</span> Camera<span class="operator">::</span>startCamera()
{
camera<span class="operator">-</span><span class="operator">></span>start();
}
<span class="type">void</span> Camera<span class="operator">::</span>stopCamera()
{
camera<span class="operator">-</span><span class="operator">></span>stop();
}
<span class="type">void</span> Camera<span class="operator">::</span>updateCaptureMode()
{
<span class="type">int</span> tabIndex <span class="operator">=</span> ui<span class="operator">-</span><span class="operator">></span>captureWidget<span class="operator">-</span><span class="operator">></span>currentIndex();
<span class="type"><a href="qcamera.html">QCamera</a></span><span class="operator">::</span>CaptureModes captureMode <span class="operator">=</span> tabIndex <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span> <span class="operator">?</span> <span class="type"><a href="qcamera.html">QCamera</a></span><span class="operator">::</span>CaptureStillImage : <span class="type"><a href="qcamera.html">QCamera</a></span><span class="operator">::</span>CaptureVideo;
<span class="keyword">if</span> (camera<span class="operator">-</span><span class="operator">></span>isCaptureModeSupported(captureMode))
camera<span class="operator">-</span><span class="operator">></span>setCaptureMode(captureMode);
}
<span class="type">void</span> Camera<span class="operator">::</span>updateCameraState(<span class="type"><a href="qcamera.html">QCamera</a></span><span class="operator">::</span>State state)
{
<span class="keyword">switch</span> (state) {
<span class="keyword">case</span> <span class="type"><a href="qcamera.html">QCamera</a></span><span class="operator">::</span>ActiveState:
ui<span class="operator">-</span><span class="operator">></span>actionStartCamera<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">false</span>);
ui<span class="operator">-</span><span class="operator">></span>actionStopCamera<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">true</span>);
ui<span class="operator">-</span><span class="operator">></span>captureWidget<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">true</span>);
ui<span class="operator">-</span><span class="operator">></span>actionSettings<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">true</span>);
<span class="keyword">break</span>;
<span class="keyword">case</span> <span class="type"><a href="qcamera.html">QCamera</a></span><span class="operator">::</span>UnloadedState:
<span class="keyword">case</span> <span class="type"><a href="qcamera.html">QCamera</a></span><span class="operator">::</span>LoadedState:
ui<span class="operator">-</span><span class="operator">></span>actionStartCamera<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">true</span>);
ui<span class="operator">-</span><span class="operator">></span>actionStopCamera<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">false</span>);
ui<span class="operator">-</span><span class="operator">></span>captureWidget<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">false</span>);
ui<span class="operator">-</span><span class="operator">></span>actionSettings<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">false</span>);
}
}
<span class="type">void</span> Camera<span class="operator">::</span>updateRecorderState(<span class="type"><a href="qmediarecorder.html">QMediaRecorder</a></span><span class="operator">::</span>State state)
{
<span class="keyword">switch</span> (state) {
<span class="keyword">case</span> <span class="type"><a href="qmediarecorder.html">QMediaRecorder</a></span><span class="operator">::</span>StoppedState:
ui<span class="operator">-</span><span class="operator">></span>recordButton<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">true</span>);
ui<span class="operator">-</span><span class="operator">></span>pauseButton<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">true</span>);
ui<span class="operator">-</span><span class="operator">></span>stopButton<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">false</span>);
<span class="keyword">break</span>;
<span class="keyword">case</span> <span class="type"><a href="qmediarecorder.html">QMediaRecorder</a></span><span class="operator">::</span>PausedState:
ui<span class="operator">-</span><span class="operator">></span>recordButton<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">true</span>);
ui<span class="operator">-</span><span class="operator">></span>pauseButton<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">false</span>);
ui<span class="operator">-</span><span class="operator">></span>stopButton<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">true</span>);
<span class="keyword">break</span>;
<span class="keyword">case</span> <span class="type"><a href="qmediarecorder.html">QMediaRecorder</a></span><span class="operator">::</span>RecordingState:
ui<span class="operator">-</span><span class="operator">></span>recordButton<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">false</span>);
ui<span class="operator">-</span><span class="operator">></span>pauseButton<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">true</span>);
ui<span class="operator">-</span><span class="operator">></span>stopButton<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">true</span>);
<span class="keyword">break</span>;
}
}
<span class="type">void</span> Camera<span class="operator">::</span>setExposureCompensation(<span class="type">int</span> index)
{
camera<span class="operator">-</span><span class="operator">></span>exposure()<span class="operator">-</span><span class="operator">></span>setExposureCompensation(index<span class="operator">*</span><span class="number">0.5</span>);
}
<span class="type">void</span> Camera<span class="operator">::</span>displayRecorderError()
{
<span class="type">QMessageBox</span><span class="operator">::</span>warning(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">"Capture Error"</span>)<span class="operator">,</span> mediaRecorder<span class="operator">-</span><span class="operator">></span>errorString());
}
<span class="type">void</span> Camera<span class="operator">::</span>displayCameraError()
{
<span class="type">QMessageBox</span><span class="operator">::</span>warning(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">"Camera Error"</span>)<span class="operator">,</span> camera<span class="operator">-</span><span class="operator">></span>errorString());
}
<span class="type">void</span> Camera<span class="operator">::</span>updateCameraDevice(<span class="type">QAction</span> <span class="operator">*</span>action)
{
setCamera(qvariant_cast<span class="operator"><</span><span class="type"><a href="qcamerainfo.html">QCameraInfo</a></span><span class="operator">></span>(action<span class="operator">-</span><span class="operator">></span>data()));
}
<span class="type">void</span> Camera<span class="operator">::</span>displayViewfinder()
{
ui<span class="operator">-</span><span class="operator">></span>stackedWidget<span class="operator">-</span><span class="operator">></span>setCurrentIndex(<span class="number">0</span>);
}
<span class="type">void</span> Camera<span class="operator">::</span>displayCapturedImage()
{
ui<span class="operator">-</span><span class="operator">></span>stackedWidget<span class="operator">-</span><span class="operator">></span>setCurrentIndex(<span class="number">1</span>);
}
<span class="type">void</span> Camera<span class="operator">::</span>readyForCapture(bool ready)
{
ui<span class="operator">-</span><span class="operator">></span>takeImageButton<span class="operator">-</span><span class="operator">></span>setEnabled(ready);
}
<span class="type">void</span> Camera<span class="operator">::</span>imageSaved(<span class="type">int</span> id<span class="operator">,</span> <span class="keyword">const</span> <span class="type">QString</span> <span class="operator">&</span>fileName)
{
Q_UNUSED(id);
ui<span class="operator">-</span><span class="operator">></span>statusbar<span class="operator">-</span><span class="operator">></span>showMessage(tr(<span class="string">"Captured \"%1\""</span>)<span class="operator">.</span>arg(<span class="type">QDir</span><span class="operator">::</span>toNativeSeparators(fileName)));
isCapturingImage <span class="operator">=</span> <span class="keyword">false</span>;
<span class="keyword">if</span> (applicationExiting)
close();
}
<span class="type">void</span> Camera<span class="operator">::</span>closeEvent(<span class="type">QCloseEvent</span> <span class="operator">*</span>event)
{
<span class="keyword">if</span> (isCapturingImage) {
setEnabled(<span class="keyword">false</span>);
applicationExiting <span class="operator">=</span> <span class="keyword">true</span>;
event<span class="operator">-</span><span class="operator">></span>ignore();
} <span class="keyword">else</span> {
event<span class="operator">-</span><span class="operator">></span>accept();
}
}
</pre>
</div>
<!-- @@@multimediawidgets/camera/camera.cpp -->
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<acronym title="Copyright">©</acronym> 2017 The Qt Company Ltd.
Documentation contributions included herein are the copyrights of
their respective owners.<br> The documentation provided herein is licensed under the terms of the <a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation License version 1.3</a> as published by the Free Software Foundation.<br> Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property
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