I'm using QGraphicsView / QGraphicsScene and added a QTestEdit-Widget. Unfortunately, the TextEdit gets rendered with a gray bar below, and I'm unable to get rid of it. Does anyone know how to achieve this?
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
QGraphicsView *view = new QGraphicsView(ui->centralWidget);
QGraphicsScene *scene = new QGraphicsScene(0, 0, 2000, 2000, view);
scene->setSceneRect(-100,-100,400,400);
view->setTransformationAnchor(QGraphicsView::NoAnchor);
view->setScene(scene);
QTextEdit *edt_test = new QTextEdit(0);
edt_test->setGeometry(10,20,80,60);
edt_test->setFrameStyle(QFrame::Plain | QFrame::Box);
scene->addWidget(edt_test);
}
using StyleSheet didn't solve the problem, but the following worked fine:
QTextEdit *edt_test = new QTextEdit(0);
QGraphicsProxyWidget *proxy = scene->addWidget(edt_test);
edt_test->setFrameStyle(QFrame::Plain | QFrame::Box);
proxy->setGeometry(QRectF(10,20,80,60));
calling setGeometry based on the ProxyWidget is the solution. Seems weird ...
Related
I want to be able to change page of QStackedWidget with some kind of animation (like fade in/out or others...)
after some research I find out maybe its possible with QGraphicsOpacityEffect, then I found this codes in here
Fade In Your Widget
// w is your widget
QGraphicsOpacityEffect *eff = new QGraphicsOpacityEffect(this);
w->setGraphicsEffect(eff);
QPropertyAnimation *a = new QPropertyAnimation(eff,"opacity");
a->setDuration(350);
a->setStartValue(0);
a->setEndValue(1);
a->setEasingCurve(QEasingCurve::InBack);
a->start(QPropertyAnimation::DeleteWhenStopped);
Fade Out Your Widget
// w is your widget
QGraphicsOpacityEffect *eff = new QGraphicsOpacityEffect(this);
w->setGraphicsEffect(eff);
QPropertyAnimation *a = new QPropertyAnimation(eff,"opacity");
a->setDuration(350);
a->setStartValue(1);
a->setEndValue(0);
a->setEasingCurve(QEasingCurve::OutBack);
a->start(QPropertyAnimation::DeleteWhenStopped);
connect(a,SIGNAL(finished()),this,SLOT(hideThisWidget()));
// now implement a slot called hideThisWidget() to do
// things like hide any background dimmer, etc.
but looks like these codes have some problem when used in QWidget inside of QStackedWidget i mean widget successfully fade in and out, but after animation finish if I minimize the windows the widget will disappear completely! (Im still able to see widget in bottom right corner of my window, looks like its pos changed?!)
btw my program is frameless.
thanks for help.
here is a example from my problem
test.cpp
Test::Test(QWidget *parent)
: CustomMainWindow(parent)
{
ui.setupUi(this);
setShadow(ui.bg_app);
connect(ui.close_app_btn, &QPushButton::clicked, this, &QWidget::close);
connect(ui.minimize_app_btn, &QPushButton::clicked, this, &QWidget::showMinimized);
QGraphicsOpacityEffect* eff = new QGraphicsOpacityEffect(this);
ui.checking->setGraphicsEffect(eff); // checking is my widget inside of QStackedWidget.
QPropertyAnimation* a = new QPropertyAnimation(eff, "opacity");
a->setDuration(350);
a->setStartValue(0);
a->setEndValue(1);
a->setEasingCurve(QEasingCurve::InBack);
a->start(QPropertyAnimation::DeleteWhenStopped);
}
CustomMainWindow.cpp
CustomMainWindow::CustomMainWindow(QWidget *parent)
: QMainWindow(parent)
{
setWindowFlags(windowFlags() | Qt::Window | Qt::FramelessWindowHint | Qt::WindowSystemMenuHint);
setAttribute(Qt::WA_TranslucentBackground);
}
void CustomMainWindow::setShadow(QWidget* window)
{
QGraphicsDropShadowEffect* windowShadow = new QGraphicsDropShadowEffect;
windowShadow->setBlurRadius(9.0);
windowShadow->setColor(palette().color(QPalette::Highlight));
windowShadow->setOffset(0.0);
window->setGraphicsEffect(windowShadow);
}
when I run my program with this code, at first its successfully Fade In, but if I for example minimize the window the widget move from its original position to somewhere else, look at this gif
Note: MainWindow is the name of my class.
Header file:
//...
private slots:
void animationStackedWidgets();
void whenAnimationFinish();
//....
CPP file:
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
, ui(new Ui::MainWindow)
{
ui->setupUi(this);
connect(ui->button, &QPushButton::clicked, this, &MainWindow::animationStackedWidgets);
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::animationStackedWidgets()
{
QGraphicsOpacityEffect *effect = new QGraphicsOpacityEffect(this);
ui->stackedWidget->setGraphicsEffect(effect);
QPropertyAnimation *anim = new QPropertyAnimation(effectSw,"opacity");
anim->setDuration(350);
anim->setStartValue(0);
anim->setEndValue(1);
anim->setEasingCurve(QEasingCurve::InBack);
anim->start(QPropertyAnimation::DeleteWhenStopped);
connect(anim, SIGNAL(finished()), this, SLOT(whenAnimationFinish()));
}
void MainWindow::whenAnimationFinish()
{
ui->stackedWidget->setGraphicsEffect(0); // remove effect
}
I have a Qt application which simply captures from the default webcam and shows it on a QVideoWidget. In the ui, I have a simple MainWindow with a QGraphicsView inside a VerticalLayout:
ui design
My mainwindow.cpp=============================================
#include "mainwindow.h"
#include "ui_mainwindow.h"
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
m_viewfinder = new QVideoWidget(ui->captureView);
m_camera = new QCamera(QCameraInfo::defaultCamera());
m_camera->setViewfinder(m_viewfinder);
m_camera->start();
}
MainWindow::~MainWindow()
{
m_camera->stop();
delete m_viewfinder;
delete m_camera;
delete ui;
}
When I execute this, I get the application running, but the video contents do not scale according to the mainwindow size. Examples:
When I start the application
Resizing mainwindow down
Resizing mainwindow up
Is there some way to make the video content resize well and fit the available area?
I have seen this answer: QVideoWidget: Video is cut off, but it doesn't offer any solution that works for me. When use the QGraphicsView-QGraphicsScene-QGraphicsVideoItem chain, I see nothing at all.
When you use the following instruction:
m_viewfinder = new QVideoWidget(ui->captureView);
You are setting as the parent of m_viewfinder to captureView, so the positions of m_viewfinder will be relative to captureView, but this does not indicate that it will be the same size as the parent.
One of the easiest ways to do this is to use a layout. Also, it is not necessary to create the QGraphicsWidget or the QVBoxLayout, so I recommend you to delete it and get the design as it was established by default:
and then we establish a layout that is placed in the centralWidget, and in this layout we add the QVideoWidget.
...
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
m_viewfinder = new QVideoWidget;
QVBoxLayout *lay = new QVBoxLayout(ui->centralWidget);
lay->addWidget(m_viewfinder);
m_camera = new QCamera(QCameraInfo::defaultCamera());
m_camera->setViewfinder(m_viewfinder);
m_camera->start();
}
...
In the following link you can find the complete example.
I have a QStackedWidget with a custom widget in it.
//mainwindow.h
private:
CentralWidget m_centralWidget;
//mainwindow.cpp
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
ui->stackedWidget->addWidget(&m_centralWidget);
}
Now i want to create a QSplitter, fill the Splitter with content and add this Splitter to the StackedWidget.
CentralWidget::CentralWidget(QWidget *parent) :
QWidget(parent),
ui(new Ui::CentralWidget)
{
ui->setupUi(this);
connect(ui->pbAddSplit, SIGNAL(pressed()), this, SLOT(addSplit()));
}
void CentralWidget::addSplit()
{
QWidget* parent = parentWidget();
QStackedWidget* stackedWidget = qobject_cast<QStackedWidget*>(parent);
if(!stackedWidget) {
return;
}
QSplitter* splitter = new QSplitter(Qt::Vertical);
splitter->addWidget(new QLabel("Banana"));
splitter->addWidget(this);
int nIndex = stackedWidget->addWidget(splitter);
stackedWidget->setCurrentIndex(nIndex);
}
The result should be a QLabel("Banana") as one Widget of the splitter and the CentralWidget as the other splitter-widget.
But i just get the QLabel("Banana") - SplitterHandle and the CentralWidget got lost somehow...
splitter->addWidget(this) is obviously wrong...
Replacing it with splitter->addWidget(new QLabel("Cherry")) will result in a correct SplitterWidget...
The problem seems to be the parenting, but i cant figure it out.
Any suggestions would be most welcome!
I'm new wit Qt.
When I start my application I'll fade out a white image and then my startMenu widget which contains some QPushbutton should show up.
StartMenu::StartMenu(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::StartMenu)
{
ui->setupUi(this);
setWindowFlags(Qt::Window | Qt::FramelessWindowHint);//hide frame window
ui->centralwidget->setStyleSheet("image: url(:/gui.png);");
QGraphicsOpacityEffect *opacityEffect = new QGraphicsOpacityEffect(this);
opacityEffect->setOpacity(1.0);
ui->centralwidget->setGraphicsEffect(opacityEffect);
QPropertyAnimation * anim = new QPropertyAnimation(this);
anim->setTargetObject(opacityEffect);
anim->setPropertyName("opacity");
anim->setDuration(4000);
anim->setStartValue(opacityEffect->opacity());
anim->setEndValue(0);
anim->setEasingCurve(QEasingCurve::OutQuad);
anim->start(QAbstractAnimation::KeepWhenStopped);
}
So far i have written this code, but this code fade out the whole centralwidget. Hope you guys understand my question and can help me.
I am working with qt 3.3. I need to make QDialog widget with null parent always visible not stays on top (WStyle_StaysOnTop) because this flag block access for main application. I need on screen keyboard functionality for my QDialog widget.
I hope I correctly understood the question. Here is a minimal example of what u want.
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
QDialog *dia = new QDialog(this);
//Set the windowflags
dia->setWindowFlags(dia->windowFlags() | Qt::Tool);
dia->show();
QWidget *central = new QWidget;
QHBoxLayout *mainLayout = new QHBoxLayout;
QLineEdit *edit = new QLineEdit;
//Add sample QLineEdit to test the input focus for mainwindow
mainLayout->addWidget(edit);
central->setLayout(mainLayout);
setCentralWidget(central);
}
edit:
If you want to be able to minimize and maximize the dialog in question from systray you have to create the QSystrayIcon and context menu for it:
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
QDialog *dia = new QDialog(this);
dia->setWindowFlags(dia->windowFlags() | Qt::Tool);
dia->show();
QWidget *central = new QWidget;
QHBoxLayout *mainLayout = new QHBoxLayout;
QLineEdit *edit = new QLineEdit;
mainLayout->addWidget(edit);
central->setLayout(mainLayout);
setCentralWidget(central);
//Create the icon for systray
//NOTE this icon is application wide
QSystemTrayIcon *icon = new QSystemTrayIcon(QIcon(QPixmap("/usr/share/icons/oxygen/22x22/status/user-away.png")), dia);
icon->setVisible(true);
//Create context menu to manipulate the dialog
QMenu *contextMenu = new QMenu;
QAction *minimizeDialog = contextMenu->addAction("Minimize dialog");
QAction *restoreDialog = contextMenu->addAction("Restore dialog");
connect(minimizeDialog, SIGNAL(triggered()), dia, SLOT(hide()));
connect(restoreDialog, SIGNAL(triggered()), dia, SLOT(show()));
//Add it to the icon
icon->setContextMenu(contextMenu);
}