详解QT媒体播放器代码案例实现

MAINWINDOW.cpp  
#include"mainwindow.h"  
#include"ui_mainwindow.h"  
#include  
#include  
#include  
#include  
#include  
#include  
#include  
#include  
#include  
#include  
#include  
#include"QFileDialog"  
#include"qDebug"  
#include"phonon"  
#include"QLabel"  
#include  
#include  
#include  
#include"phonon/VideoWidget"  
#include"QTime"  
#include  
#include  
MainWindow::MainWindow(QWidget*parent):  
QMainWindow(parent),  
ui(newUi::MainWindow)  
{  
ui->setupUi(this);  
ui->widget->installEventFilter(this);  
media=newPhonon::MediaObject;  
//media->setCurrentSource(Phonon::MediaSource("../Puppet.mpg"));  
w1=newQWidget(this);  
w3=newQWidget(this);  
timeLcd=newQLCDNumber(this);  
vwidget=newPhonon::VideoWidget(w1);  
Phonon::createPath(media,vwidget);  
vwidget->setAspectRatio(Phonon::VideoWidget::AspectRatioAuto);  
aOutput=newPhonon::AudioOutput(Phonon::VideoCategory);  
Phonon::createPath(media,aOutput);  
//QLabel*l1=newQLabel(QString::fromLocal8Bit("播放进度:"));  
//QLabel*l2=newQLabel(QString::fromLocal8Bit("音量:"));  
volumeSlider=newPhonon::VolumeSlider;  
volumeSlider->setAudioOutput(aOutput);  
volumeSlider->setSizePolicy(QSizePolicy::Maximum,QSizePolicy::Maximum);  
Phonon::SeekSlider*seekSlider=newPhonon::SeekSlider;  
seekSlider->setMediaObject(media);  
timeLcd->display("00:00");  
QVBoxLayout*vLayout=newQVBoxLayout;  
vLayout->addWidget(vwidget);  
vwidget->resize(1024,768);  
w1->setLayout(vLayout);  
//QHBoxLayout*h1=newQHBoxLayout;  
//h1->addWidget(l1);  
//h1->addWidget(seekSlider);  
//h1->addWidget(timeLcd);  
//QHBoxLayout*h2=newQHBoxLayout;  
//h2->addWidget(l2);  
//h2->addWidget(volumeSlider);  
//h2->addWidget(ui->widget_4);  
//QVBoxLayout*vLayout1=newQVBoxLayout;  
//vLayout1->addLayout(h1);  
//vLayout1->addLayout(h2);  
//w3->setLayout(vLayout1);  
//QHBoxLayout*hLayout1=newQHBoxLayout;  
//hLayout1->addWidget(w3);  
//QVBoxLayout*vLayout3=newQVBoxLayout;  
//vLayout3->addWidget(w1);  
//vLayout3->addLayout(hLayout1);  
//vLayout3->addWidget(ui->widget_4);  
//w2=newQWidget(this);  
//w2->setLayout(vLayout3);  
this->setCentralWidget(w1);  
QDockWidget*shapesDockWidget1=newQDockWidget(QString::fromLocal8Bit("播放进度"));  
shapesDockWidget1->setWidget(seekSlider);  
//shapesDockWidget1->setLayout(h2);  
//shapesDockWidget->setAllowedAreas(Qt::LeftDockWidgetArea  
//|Qt::RightDockWidgetArea);  
addDockWidget(Qt::BottomDockWidgetArea,shapesDockWidget1);  
QDockWidget*shapesDockWidget2=newQDockWidget(QString::fromLocal8Bit("播放时间"));  
shapesDockWidget2->setWidget(timeLcd);  
shapesDockWidget2->setMaximumSize(100,100);  
//shapesDockWidget1->setLayout(h2);  
//shapesDockWidget->setAllowedAreas(Qt::LeftDockWidgetArea  
//|Qt::RightDockWidgetArea);  
addDockWidget(Qt::BottomDockWidgetArea,shapesDockWidget2);  
QDockWidget*shapesDockWidget3=newQDockWidget(QString::fromLocal8Bit("播放界面"));  
shapesDockWidget3->setWidget(ui->widget_4);  
//shapesDockWidget1->setLayout(h2);  
//shapesDockWidget->setAllowedAreas(Qt::LeftDockWidgetArea  
//|Qt::RightDockWidgetArea);  
//addDockWidget(Qt::RightDockWidgetArea,shapesDockWidget3);  
addDockWidget(Qt::BottomDockWidgetArea,shapesDockWidget3);  
QDockWidget*shapesDockWidget=newQDockWidget(QString::fromLocal8Bit("音量"));  
shapesDockWidget->setWidget(volumeSlider);  
//shapesDockWidget->setAllowedAreas(Qt::LeftDockWidgetArea  
//|Qt::RightDockWidgetArea);  
addDockWidget(Qt::BottomDockWidgetArea,shapesDockWidget);  
ui->pushButton_5->setEnabled(false);  
ui->pushButton_7->setEnabled(false);  
//QAction*at=newQAction("退出全屏",vwidget);  
//vwidget->addAction(at);  
//vwidget->setAcceptDrops(true);  
//at->setShortcuts(QList()<   
//connect(at,SIGNAL(triggered()),vwidget,SLOT(exitFullScreen()));  
QAction*at1=newQAction("退出全屏",vwidget);  
vwidget->addAction(at1);  
vwidget->setAcceptDrops(true);  
at1->setShortcuts(QList()<   
connect(at1,SIGNAL(triggered()),vwidget,SLOT(exitFullScreen()));  
connect(media,SIGNAL(tick(qint64)),this,SLOT(tick(qint64)));  
readSettings();  
}  
MainWindow::~MainWindow()  
{  
deleteui;  
}  
voidMainWindow::resizeEvent(QResizeEvent*)  
{  
//QBitmapmaskBitmap(width(),height());  
//maskBitmap.clear();  
 
//QPainterp(&maskBitmap);  
//p.setBrush(Qt::black);  
//p.drawRoundRect(0,0,width(),height(),2,4);  
//p.end();  
 
//setMask(maskBitmap);  
}  
voidMainWindow::mouseMoveEvent(QMouseEvent*event)  
{  
//if(event->buttons()&Qt::LeftButton){  
////move(event->globalPos()-m_dragPosition);  
//move(event->globalPos()-m_dragPosition);  
//event->accept();  
//}  
 
}  
voidMainWindow::mousePressEvent(QMouseEvent*event)  
{  
//if(event->button()==Qt::LeftButton){  
//m_dragPosition=event->globalPos()-frameGeometry().topLeft();  
 
////m_dragPosition=event->globalPos()-frameGeometry().topLeft();  
//////ui->widget->move(m_dragPosition);  
//event->accept();  
//}  
}  
voidMainWindow::on_pushButton_2_clicked()  
{  
this->close();  
}  
voidMainWindow::on_pushButton_3_clicked()  
{  
this->showMinimized();  
}  
boolMainWindow::eventFilter(QObject*obj,QEvent*event)  
{  
if(obj==ui->widget){  
if(event->type()==QEvent::MouseButtonPress){  
QMouseEvent*ev=static_cast(event);  
if(ev->buttons()&Qt::LeftButton)  
{  
m_dragPosition=ev->globalPos()-frameGeometry().topLeft();  
ev->accept();  
}  
returntrue;  
}elseif(event->type()==QEvent::MouseMove){  
QMouseEvent*ev=static_cast(event);  
if(ev->buttons()&Qt::LeftButton){  
//move(event->globalPos()-m_dragPosition);  
move(ev->globalPos()-m_dragPosition);  
ev->accept();  
}  
 
}  
else{  
returnfalse;  
}  
 
}  
elseif(obj==w1)  
{  
if(event->type()==QEvent::MouseButtonPress){  
QMouseEvent*ev=static_cast(event);  
if(ev->buttons()&Qt::LeftButton)  
{  
vwidget=newPhonon::VideoWidget(this);  
vwidget->setAspectRatio(Phonon::VideoWidget::AspectRatioAuto);  
vwidget->exitFullScreen();  
}  
}  
}  
else{  
//passtheeventontotheparentclass  
returnQMainWindow::eventFilter(obj,event);  
}  
returntrue;  
}  
voidMainWindow::on_pushButton_4_clicked()  
{  
QStringfilename=QFileDialog::getOpenFileName(this,QString::fromLocal8Bit("文件类型"),".",
QString::fromLocal8Bit("文问类型(*.*)"));  
qDebug()<   
media->setCurrentSource(Phonon::MediaSource(filename));  
media->play();  
this->setWindowTitle(filename);  
ui->pushButton_5->setEnabled(false);  
ui->pushButton_7->setEnabled(true);  
w1->setFocus();  
//this->ui->label->setText(filename);  
}  
voidMainWindow::on_pushButton_8_clicked()  
{  
QMessageBox::information(this,tr("AboutMdieaPlayer"),  
tr("ID:Jammy0.03"));  
}  
voidMainWindow::on_pushButton_clicked()  
{  
vwidget->enterFullScreen();  
}  
voidMainWindow::on_pushButton_5_clicked()  
{  
media->play();  
ui->pushButton_5->setEnabled(false);  
ui->pushButton_7->setEnabled(true);  
}  
voidMainWindow::on_pushButton_7_clicked()  
{  
media->pause();  
 
ui->pushButton_7->setEnabled(false);  
ui->pushButton_5->setEnabled(true);  
}  
voidMainWindow::on_pushButton_6_clicked()  
{  
//media->setCurrentSource(Phonon::MediaSource(this->ui->label->text()));  
media->stop();  
}  
voidMainWindow::tick(qint64time)  
{  
QTimedisplayTime(0,(time/60000)%60,(time/1000)%60);  
timeLcd->display(displayTime.toString("mm:ss"));  
}  
voidMainWindow::keyPressEvent(QKeyEvent*k)  
{  
if(k->key()==Qt::Key_Space)  
{  
if(ui->pushButton_5->isEnabled()==true)  
{  
media->pause();  
ui->pushButton_5->setEnabled(false);  
ui->pushButton_7->setEnabled(true);  
}  
elseif(ui->pushButton_5->isEnabled()==false)  
{  
media->play();  
ui->pushButton_5->setEnabled(true);  
ui->pushButton_7->setEnabled(false);  
}  
}  
elseif(k->modifiers()==Qt::AltModifier&&k->key()==Qt::Key_Return)  
{  
vwidget->enterFullScreen();  
}  
//elseif(k->modifiers()==Qt::ShiftModifier&&k->key()==Qt::Key_A)  
//{  
//vwidget->enterFullScreen();  
//}  
}  
voidMainWindow::writeSettings()  
{  
QSettingssettings("SoftwareInc.","IconEditor");  
settings.beginGroup("mainWindow");  
settings.setValue("size",size());  
settings.setValue("state",saveState());  
settings.endGroup();  
}  
voidMainWindow::readSettings()  
{  
QSettingssettings("SoftwareInc.","IconEditor");  
settings.beginGroup("mainWindow");  
resize(settings.value("size").toSize());  
restoreState(settings.value("state").toByteArray());  
settings.endGroup();  
}  
voidMainWindow::closeEvent(QCloseEvent*ex)  
{  
inta=QMessageBox::information(NULL,QString::fromLocal8Bit("对话框"),
QString::fromLocal8Bit("是否需要退出"),
QString::fromLocal8Bit("确定"),
QString::fromLocal8Bit("取消"),NULL,0,-1);  
if(a==0)  
{  
writeSettings();  
ex->accept();  
}  
elseif(a==1)  
{  
ex->ignore();  
}  
}  
****************************************************  
MAINWINDOW.H  
#defineMAINWINDOW_H  
#include  
#include  
#include  
#include  
namespaceUi{  
classMainWindow;  
}  
classMainWindow:publicQMainWindow  
{  
Q_OBJECT  
public:  
explicitMainWindow(QWidget*parent=0);  
~MainWindow();  
protected:  
Phonon::MediaObject*media;  
Phonon::VideoWidget*vwidget;  
Phonon::AudioOutput*aOutput;  
Phonon::VolumeSlider*volumeSlider;  
Phonon::SeekSlider*seekSlider;  
private:  
Ui::MainWindow*ui;  
QPointm_dragPosition;  
protected:  
voidresizeEvent(QResizeEvent*event);  
voidmouseMoveEvent(QMouseEvent*event);  
voidmousePressEvent(QMouseEvent*event);  
booleventFilter(QObject*obj,QEvent*ev);  
QWidget*w1;  
QWidget*w2;  
QWidget*w3;  
QLCDNumber*timeLcd;  
privateslots:  
voidon_pushButton_6_clicked();  
voidon_pushButton_7_clicked();  
voidon_pushButton_5_clicked();  
voidon_pushButton_clicked();  
voidon_pushButton_8_clicked();  
voidon_pushButton_4_clicked();  
voidon_pushButton_3_clicked();  
voidon_pushButton_2_clicked();  
voidtick(qint64time);  
voidkeyPressEvent(QKeyEvent*k);  
voidwriteSettings();  
voidreadSettings();  
voidcloseEvent(QCloseEvent*ex);  
};  
#endif//MAINWINDOW_H 
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.
36.
37.
38.
39.
40.
41.
42.
43.
44.
45.
46.
47.
48.
49.
50.
51.
52.
53.
54.
55.
56.
57.
58.
59.
60.
61.
62.
63.
64.
65.
66.
67.
68.
69.
70.
71.
72.
73.
74.
75.
76.
77.
78.
79.
80.
81.
82.
83.
84.
85.
86.
87.
88.
89.
90.
91.
92.
93.
94.
95.
96.
97.
98.
99.
100.
101.
102.
103.
104.
105.
106.
107.
108.
109.
110.
111.
112.
113.
114.
115.
116.
117.
118.
119.
120.
121.
122.
123.
124.
125.
126.
127.
128.
129.
130.
131.
132.
133.
134.
135.
136.
137.
138.
139.
140.
141.
142.
143.
144.
145.
146.
147.
148.
149.
150.
151.
152.
153.
154.
155.
156.
157.
158.
159.
160.
161.
162.
163.
164.
165.
166.
167.
168.
169.
170.
171.
172.
173.
174.
175.
176.
177.
178.
179.
180.
181.
182.
183.
184.
185.
186.
187.
188.
189.
190.
191.
192.
193.
194.
195.
196.
197.
198.
199.
200.
201.
202.
203.
204.
205.
206.
207.
208.
209.
210.
211.
212.
213.
214.
215.
216.
217.
218.
219.
220.
221.
222.
223.
224.
225.
226.
227.
228.
229.
230.
231.
232.
233.
234.
235.
236.
237.
238.
239.
240.
241.
242.
243.
244.
245.
246.
247.
248.
249.
250.
251.
252.
253.
254.
255.
256.
257.
258.
259.
260.
261.
262.
263.
264.
265.
266.
267.
268.
269.
270.
271.
272.
273.
274.
275.
276.
277.
278.
279.
280.
281.
282.
283.
284.
285.
286.
287.
288.
289.
290.
291.
292.
293.
294.
295.
296.
297.
298.
299.
300.
301.
302.
303.
304.
305.
306.
307.
308.
309.
310.
311.
312.
313.
314.
315.
316.
317.
318.
319.
320.
321.
322.
323.
324.
325.
326.
327.
328.
329.
330.
331.
332.
333.
334.
335.
336.
337.
338.
339.
340.
341.
342.
343.
344.
345.
346.
347.
348.
349.
350.
351.
352.
353.