Can we include and show some others widgets in a QVideoWidget? [duplicate] - qt

everyone! I try to set a click property to a QMediaPlayer Element, but I can not find the mode to make it, and if I try to put a button in front to Video, the button puts behind to video, even with
button->raise();
videoWidget->lower();
And If I put a Button to fullscreen the screen turns in black and don't shows the video
this id the code of the video player
QMediaPlayer *player = new QMediaPlayer(this);
QVideoWidget *vw = new QVideoWidget(this);
QMediaPlaylist *PlayList = new QMediaPlaylist(this);
PlayList->addMedia(QUrl::fromLocalFile("/home/user/Videos/video.mp4"));
PlayList->setPlaybackMode(QMediaPlaylist::Loop);
QVBoxLayout *layout = new QVBoxLayout;
layout->addWidget(vw);
player->setVideoOutput(vw);
player->setPlaylist(PlayList);
vw->setGeometry(0,0,800,480);
vw->show();
player->play();

One possible solution is to create a widget where the QVideoWidget is placed through a layout, the button is also added and we change the position through the resizeEvent() event.
#include <QApplication>
#include <QMediaPlayer>
#include <QMediaPlaylist>
#include <QPushButton>
#include <QUrl>
#include <QVBoxLayout>
#include <QVideoWidget>
#include <QDebug>
class VideoWidgetButton: public QWidget{
QPushButton *btn;
QVideoWidget *vw;
QMediaPlayer *player;
public:
VideoWidgetButton(QWidget *parent=Q_NULLPTR):QWidget(parent){
setLayout(new QVBoxLayout);
layout()->setContentsMargins(0, 0, 0, 0);
vw = new QVideoWidget(this);
btn = new QPushButton(this);
btn->setIcon(QIcon(":/icons/tux.jpeg"));
btn->resize(QSize(128, 128));
btn->setIconSize(QSize(128, 128));
connect(btn, &QPushButton::clicked, [](){
qDebug()<<"clicked";
});
layout()->addWidget(vw);
player = new QMediaPlayer(this);
player->setVideoOutput(vw);
QMediaPlaylist *playList = new QMediaPlaylist(this);
playList->addMedia(QUrl("qrc:/video/SampleVideo_1280x720_1mb.mp4"));
playList->setPlaybackMode(QMediaPlaylist::Loop);
player->setPlaylist(playList);
player->play();
}
protected:
void resizeEvent(QResizeEvent *ev){
btn->move(rect().bottomRight()-btn->rect().bottomRight());
return QWidget::resizeEvent(ev);
}
};
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
VideoWidgetButton w;
w.resize(640, 480);
w.show();
return a.exec();
}
The complete example can be found in the following link.

Related

QGraphicsView cannot render video when there is a QWebEngineView

I am making a very simple application which plays a video using QMediaPlayer/QGraphicsVideoItem/QGraphicsScene/QGraphicsView and in the meantime, it displays a web page using QWebEngineView.
However, when the QWebEngineView shows, only the sound of the video is played. The widget shows only white. When QWebEngineView's ->show() is not called, the video plays normally.
I've tried QVideoWidget. It doesn't have such problem.
I'm thinking that the rendering of the QGraphicsView might have conflicts with QWebEngine's.
Here's the code:
#include "mainwindow.h"
#include <QApplication>
#include <QWebEngineView>
#include <QGraphicsView>
#include <QGraphicsScene>
#include <QMediaPlayer>
#include <QVideoWidget>
#include <QGraphicsVideoItem>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QWebEngineView *webview = new QWebEngineView();
QMediaPlayer *player = new QMediaPlayer();
QGraphicsVideoItem *item = new QGraphicsVideoItem;
QVideoWidget *vwid = new QVideoWidget();
QGraphicsView *gview = new QGraphicsView();
player->setMedia(QUrl::fromLocalFile("/home/user/Videos/IMG_6201.MOV"));
//player->setVideoOutput(vwid);
player->setVideoOutput(item);
QGraphicsScene *gscene = new QGraphicsScene();
gview->setScene(gscene);
webview.setUrl(QUrl("https://www.google.com"));
gview->scene()->addItem(item);
//vwid->show();
player->play();
webview->show();
gview->show();
return a.exec();
}

Issue with Qt Toolbar extension button

I have to add a toolbar in Qt like the Windows file system explorer one under menu bar (I'm under Windows 7) , that means when the window width is reduced, icons which don't have enough place to be displayed are automatically hidden and put into a drop down list (which is displayed when clicking to an arrow which appears to the toolbar's right side). I first copy paste a code that I found to the web :
#include <QApplication>
#include <QAction>
#include <QMainWindow>
#include <QLineEdit>
#include <QToolBar>
#include <QHBoxLayout>
void initWindow(QMainWindow* w);
int main(int argc, char *argv[])
{
Q_INIT_RESOURCE(application);
QApplication app(argc, argv);
QMainWindow mainWin;
initWindow(&mainWin);
mainWin.show();
return app.exec();
}
void initWindow(QMainWindow* w)
{
QLineEdit* searchBar = new QLineEdit;
QAction* newAct = new QAction(QIcon(":/images/new.png"), "&New", w);
newAct->setShortcuts(QKeySequence::New);
QAction* openAct = new QAction(QIcon(":/images/open.png"), "&Open...", w);
openAct->setShortcuts(QKeySequence::Open);
QAction* saveAct = new QAction(QIcon(":/images/save.png"), "&Save", w);
saveAct->setShortcuts(QKeySequence::Save);
QAction* cutAct = new QAction(QIcon(":/images/cut.png"), "Cu&t", w);
cutAct->setShortcuts(QKeySequence::Cut);
QAction* copyAct = new QAction(QIcon(":/images/copy.png"), "&Copy", w);
copyAct->setShortcuts(QKeySequence::Copy);
QAction* pasteAct = new QAction(QIcon(":/images/paste.png"), "&Paste", w);
pasteAct->setShortcuts(QKeySequence::Paste);
QToolBar* fileToolBar = w->addToolBar("File");
fileToolBar->addAction(newAct);
fileToolBar->addAction(openAct);
fileToolBar->addAction(saveAct);
QToolBar* editToolBar = w->addToolBar("Edit");
editToolBar->addAction(cutAct);
editToolBar->addAction(copyAct);
editToolBar->addAction(pasteAct);
editToolBar->addWidget(searchBar);
}
... but the problem is that code works only for toolbars into a QMainWindow (and add by using QMainWindow::addToolbar() method). But into the code which I'm working for I have to do that into a QWidget, not a QWindow. So I created a horizontal layout, I added several widget into it (a QLineEdit and several QAction) and it works fine for QAction but not for QLineEdit : When I click to the arrow, all hidden QAction are visibles but not QLineEdit. Here is my code :
#include <QApplication>
#include <QtGui/QWindow>
#include <QToolbar>
#include <QVBoxLayout>
#include <QMainWindow>
#include <QPushButton>
#include <QAction>
#include <QIcon>
#include <QLineEdit>
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QWidget* w = new QWidget;
QHBoxLayout* tb1 = new QHBoxLayout;
tb1->addWidget(new QPushButton("item11"));
tb1->addWidget(new QPushButton("item12"));
tb1->addWidget(new QPushButton("item13"));
tb1->addWidget(new QPushButton("item14"));
QHBoxLayout* spacerLayout = new QHBoxLayout;
spacerLayout->addSpacerItem(new QSpacerItem(50, 20, QSizePolicy::MinimumExpanding,QSizePolicy::Fixed) );
spacerLayout->setAlignment(Qt::AlignJustify);
QWidget* sep = new QWidget;
QRect rect = sep->geometry();
rect.setWidth(0);
sep->setGeometry(rect);
QToolBar* tb3 = new QToolBar;
QLineEdit* searchBar = new QLineEdit;
QAction* item31 = new QAction(QIcon(":/images/cut.png"), "cut");
QAction* item32 = new QAction(QIcon(":/images/copy.png"), "copy");
QAction* item33 = new QAction(QIcon(":/images/open.png"), "open");
QAction* item34 = new QAction(QIcon(":/images/paste.png"), "past");
QAction* item35 = new QAction(QIcon(":/images/save.png"), "save");
tb3->addWidget(sep);
tb3->addWidget(searchBar);
tb3->addAction(item31);
tb3->addAction(item32);
tb3->addAction(item33);
tb3->addAction(item34);
tb3->addAction(item35);
QVBoxLayout* mainLayout = new QVBoxLayout;
QHBoxLayout* topLayout = new QHBoxLayout;
topLayout->addLayout(tb1);
topLayout->addLayout(spacerLayout);
topLayout->addWidget(tb3);
QHBoxLayout* bottomLayout = new QHBoxLayout;
bottomLayout->addWidget(new QPushButton);
mainLayout->addLayout(topLayout);
mainLayout->addLayout(bottomLayout);
w->setLayout(mainLayout);
w->show();
return app.exec();
}
These are screenshots of the result with the 2nd solution : I first launch application :
http://img4.hostingpics.net/pics/224120tb1.jpg
When I reduce its width, widgets which are to the right side disapeared. Then I click to the arrow to display them into the drop down list and they are all displayed except the QLineEdit :
http://img4.hostingpics.net/pics/903380tb2.jpg
Is someone here knows what the problem is ? Thanks.
Regrettably, tool bars only function correctly when embedded in a QMainWindow. The good news is that you can use a QMainWindow as if it were a widget. You can parent it to another widget, and then it won't be a standalone window. I've done this, and it works well. I was creating the objects using Qt Designer, and I had to remove the QMainWindow menu bar because Designer creates that automatically.
It's not an intuitive thing to do, but it works just fine, and it's a fairly easy change. A well-written comment explaining why you did that would probably be welcomed by anyone else reading the code in the future...
Thank you for your answer, I tried to test with a QMainWindow but it completely messed up the layout on which I worked and as it's a complex window (a lot of people worked on it in the past) and I have to finish my work soon I preferred to try a new approach. So after some research on the web I found that it's possible to do that I want even if the toolbar is not into a QMainWindow, but I have to replace all QWidget's that I want to have into QToolBar by a class which derived of QWidgetAction's, and instantiate them into QWidgetAction::createWidget() method. So I did this code which works correctly :
main.cpp :
#include <QApplication>
#include <QtGui/QWindow>
#include <QToolbar>
#include <QVBoxLayout>
#include <QMainWindow>
#include <QPushButton>
#include <QAction>
#include <QIcon>
#include <QLineEdit>
#include <QSlider>
#include <QVariant>
#include <QCheckBox>
#include <QWidgetAction>
#include "QMyWidgetAction.h"
void test2(QApplication& app);
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
test2(app);
return app.exec();
}
void test2(QApplication& app)
{
QWidget* w = new QWidget;
QHBoxLayout* l1 = new QHBoxLayout;
l1->addWidget(new QPushButton("item11"));
l1->addWidget(new QPushButton("item12"));
l1->addWidget(new QPushButton("item13"));
l1->addWidget(new QPushButton("item14"));
QHBoxLayout* l2 = new QHBoxLayout;
l2->addSpacerItem(new QSpacerItem(50, 20, QSizePolicy::MinimumExpanding,QSizePolicy::Fixed) );
l2->setAlignment(Qt::AlignJustify);
QHBoxLayout* l3 = new QHBoxLayout;
QToolBar* tb = new QToolBar;
l3->addWidget(tb);
QAction* item31 = new QAction(QIcon(":/images/cut.png"), "cut");
QAction* item32 = new QAction(QIcon(":/images/copy.png"), "copy");
QAction* item33 = new QAction(QIcon(":/images/open.png"), "open");
QAction* item34 = new QAction(QIcon(":/images/paste.png"), "past");
QAction* item35 = new QAction(QIcon(":/images/save.png"), "save");
QLineEdit* searchBar = new QLineEdit;
QMyWidgetAction* widgetAction = new QMyWidgetAction(tb);
QLineEditAction* lineEditAction = new QLineEditAction(tb);
tb->addSeparator();
tb->addWidget(searchBar);
tb->addAction(item31);
tb->addAction(item32);
tb->addAction(item33);
tb->addAction(item34);
tb->addAction(item35);
tb->addAction(widgetAction);
tb->addAction(lineEditAction);
QVBoxLayout* mainLayout = new QVBoxLayout;
QHBoxLayout* topLayout = new QHBoxLayout;
topLayout->addLayout(l1);
topLayout->addLayout(l2);
topLayout->addLayout(l3);
QHBoxLayout* bottomLayout = new QHBoxLayout;
bottomLayout->addWidget(new QPushButton);
mainLayout->addLayout(topLayout);
mainLayout->addLayout(bottomLayout);
w->setLayout(mainLayout);
w->show();
}
QMyWidgetAction.h :
#ifndef QMAYAWIDGETACTION_H
#define QMAYAWIDGETACTION_H
#include <QObject>
#include <QWidget>
#include <QWidgetAction>
class QLineEdit;
class QMyWidgetAction : public QWidgetAction
{
Q_OBJECT
public:
QMyWidgetAction(QWidget* parent);
QWidget* createWidget(QWidget* parent);
};
class QLineEditAction : public QWidgetAction
{
Q_OBJECT
public:
QLineEditAction(QWidget* parent);
QWidget* createWidget(QWidget* parent);
protected slots:
virtual void searchTextChanged(const QString& text);
private:
QLineEdit* fWidget;
};
#endif // QMAYAWIDGETACTION_H
QMyWidgetAction.cpp :
#include <QApplication>
#include <QtGui/QWindow>
#include <QToolbar>
#include <QVBoxLayout>
#include <QMainWindow>
#include <QPushButton>
#include <QAction>
#include <QIcon>
#include <QLineEdit>
#include <QSlider>
#include <QVariant>
#include <QCheckBox>
#include <QWidgetAction>
#include "QMyWidgetAction.h"
QMyWidgetAction::QMyWidgetAction(QWidget* parent)
: QWidgetAction(parent)
{
}
QWidget* QMyWidgetAction::createWidget(QWidget* parent)
{
QPushButton* widget = new QPushButton("bouton", parent);
widget->setMinimumSize(100, 30);
return widget;
}
QLineEditAction::QLineEditAction(QWidget* parent)
: QWidgetAction(parent)
{
}
QWidget* QLineEditAction::createWidget(QWidget* parent)
{
fWidget = new QLineEdit(parent);
connect(fWidget, SIGNAL(textChanged(QString)), this, SLOT(searchTextChanged(QString)));
fWidget->setMinimumSize(100, 30);
return fWidget;
}
void QLineEditAction::searchTextChanged(const QString& text)
{
fWidget->setMinimumWidth(fWidget->minimumWidth() + 10);
}
So now here is what I get when I reduce the window width :
So the result is correct (and controls works, I tested them), but now I would like to know if it's possible to display the extension list horizontally instead of vertically ? (I mean "past" action at the right of "open" action, "save" action at the right of past action etc.) Thanks for your help.

How to play more than one videos in a QGraphicsView at same time in Qt?

if only playing one video,it's successful.but two or three,it's Failure.
I note the document for QGraphicsVideoItem:
Note: Only a single display output can be attached to a media object at one time.
so,I want to know how to palying more then one video in a QGraphicsView ?
Thanks!
my test codes:
#include <QtWidgets/QApplication>
#include <QGraphicsScene>
#include <QGraphicsVideoItem>
#include <QMediaPlayer>
#include <QGraphicsView>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QGraphicsScene scene;
scene.setSceneRect(0,0,1920,1080);
QGraphicsVideoItem *item1 = new QGraphicsVideoItem;
QMediaPlayer * player1 = new QMediaPlayer;
player1->setVideoOutput(item1);
player1->setMedia(QUrl::fromLocalFile("C:/Users/Public/Videos/Sample Videos/1.wmv"));
player1->setVolume(0);
scene.addItem(item1);
item1->setPos(0,100);
QGraphicsVideoItem *item2 = new QGraphicsVideoItem;
QMediaPlayer * player2 = new QMediaPlayer;
player2->setVideoOutput(item2);
player2->setMedia(QUrl::fromLocalFile("C:/Users/Public/Videos/Sample Videos/2.wmv"));
player2->setVolume(0);
scene.addItem(item2);
item1->setPos(500,500);
QGraphicsView view;
view.setScene(&scene);
view.scale(0.3,0.3);
view.show();
player1->play();
player2->play();
return a.exec();
}
I can suggest a way you can display the video on QGraphicsView.
QMediaPlayer *player1 = new QMediaPlayer(this);
QVideoWidget *video1 = new QVideoWidget(this);
QGraphicsVideoItem *item1 = new QGraphicsVideoItem;
QGraphicsView *view = new QGraphicsView(this);
player1->setVideoOutput(item1);
player1->setMedia(QUrl::fromLocalFile("C:/Users/Public/Videos/Sample Videos/1.wmv"));
player1->play();
view->setViewport(video1);
player1->setVideoOutput(video1);
view->show();

QScrollArea contents not showing

Below I present a full Qt project in which I was expecting to see a label and a button showing in a scrollarea, but it seems I'm not expressing myself as Qt expects. What Qt expects?
project.pro
QT += core gui
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
TARGET = untitled13
TEMPLATE = app
SOURCES += main.cpp\
widget.cpp
HEADERS += widget.h
main.cpp
#include "widget.h"
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
Widget w;
w.show();
return a.exec();
}
widget.h
#ifndef WIDGET_H
#define WIDGET_H
#include <QWidget>
class Widget : public QWidget
{
Q_OBJECT
public:
Widget(QWidget *parent = 0);
~Widget();
};
#endif // WIDGET_H
widget.cpp
#include "widget.h"
#include <QHBoxLayout>
#include <QScrollArea>
#include <QLabel>
#include <QPushButton>
Widget::Widget(QWidget *parent)
: QWidget(parent)
{
QHBoxLayout *mainLayout = new QHBoxLayout(this);
QScrollArea *scrollArea = new QScrollArea;
mainLayout->addWidget(scrollArea);
QWidget *widget = new QWidget;
scrollArea->setWidget(widget);
QHBoxLayout *hLayout = new QHBoxLayout;
widget->setLayout(hLayout);
QLabel *label = new QLabel("somelable");
hLayout->addWidget(label);
QPushButton *bt = new QPushButton("click");
hLayout->addWidget(bt);
}
Widget::~Widget()
{
}
In this specific code the problem is that you call
scrollArea->setWidget(widget);
before you add layout of the widget. Move the above mentioned call to the end of the constructor and you see the label and the button inside the scrollarea.
It's also mentioned in the QScrollArea::setWidget documentation:
Note that You must add the layout of widget before you call this
function; if you add it later, the widget will not be visible -
regardless of when you show() the scroll area.

remove extra widget/window in Qt

probably a simple question: I just created a new project in Qt creator and I set it to use QWidget when I created it, now how do I get rid of the window that it automatically creates when I run it? I also created my own QWidget window which I want to be the only window.
#include "widget.h"
#include <QtGui>
Widget::Widget()
{
QWidget* window = new QWidget;
addBtn = new QPushButton("Add Module");
text = new QTextEdit();
text->setReadOnly(true);
QVBoxLayout* layout = new QVBoxLayout();
layout->addWidget(addBtn,5);
layout->addWidget(text);
window->setLayout(layout);
window->show();
}
Widget::~Widget()
{
}
#include <QtGui/QApplication>
#include "widget.h"
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
Widget w;
w.show();
return a.exec();
}
change it like this
Widget::Widget()
{
addBtn = new QPushButton("Add Module");
text = new QTextEdit();
text->setReadOnly(true);
QVBoxLayout* layout = new QVBoxLayout();
layout->addWidget(addBtn,5);
layout->addWidget(text);
this->setLayout(layout);
}
and try to have some time on look and try some of Qt Example (you can find it in Qt Creator)
and there is about 100 short video to learn quickly basic stuff on Qt
Qt is fun, enjoy it.

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