I have the following minimal example code given.
main.cpp:
#include <QApplication>
#include "qt.h"
int main(int argc, char** argv)
{
QApplication app(argc, argv);
MyDialog mainWin;
mainWin.show();
return app.exec();
}
qt.cpp:
#include <QLabel>
#include "qt.h"
void MyDialog::setupUi()
{
setCentralWidget(new QWidget);
mainLayout = new QVBoxLayout( centralWidget() );
centralWidget()->setLayout(mainLayout);
// show the add new effect channel button
QPushButton* newKnobBtn = new QPushButton("new", this );
connect( newKnobBtn, SIGNAL(clicked()), this, SLOT(addNewKnob()));
mainLayout->addWidget( newKnobBtn, 0, Qt::AlignRight );
containerWidget = new QWidget(this);
scrollArea = new QScrollArea(containerWidget);
mainLayout->addWidget(containerWidget);
scrollLayout = new QVBoxLayout(scrollArea);
scrollArea->setLayout(scrollLayout);
/*
QSizePolicy pol;
pol.setVerticalPolicy(QSizePolicy::Expanding);
setSizePolicy(pol);
*/
addNewKnob(); // to fit size initially
}
void MyDialog::addNewKnob()
{
scrollLayout->addWidget(new QLabel("Hello World", this));
/*
containerWidget->adjustSize();
adjustSize();
*/
}
qt.h:
#include <QMainWindow>
#include <QVBoxLayout>
#include <QScrollArea>
#include <QPushButton>
class MyDialog : public QMainWindow
{
Q_OBJECT
private slots:
void addNewKnob();
private:
void setupUi();
QVBoxLayout* mainLayout;
QScrollArea* scrollArea;
QVBoxLayout* scrollLayout;
QWidget* containerWidget;
public:
MyDialog( ) { setupUi(); }
};
Compiling: Put all in one directory, type
qmake -project && qmake && make
I have the adjustSize() solution from here, but it does not work: (link). Everything I commented out was things I tried but did not help.
How do I make containerWidget and scrollLayout grow correctly, when a new Label is being added to scrollLayout?
Here's a simplified version that works for me:
qt.cpp:
#include <QLabel>
#include <QPushButton>
#include <QScrollArea>
#include "qt.h"
MyDialog::MyDialog()
{
QWidget * mainWidget = new QWidget;
QBoxLayout * mainLayout = new QVBoxLayout(mainWidget);
setCentralWidget(mainWidget);
// show the add new effect channel button
QPushButton* newKnobBtn = new QPushButton("new");
connect( newKnobBtn, SIGNAL(clicked()), this, SLOT(addNewKnob()));
mainLayout->addWidget( newKnobBtn, 0, Qt::AlignRight );
QScrollArea * scrollArea = new QScrollArea;
scrollArea->setWidgetResizable(true);
mainLayout->addWidget(scrollArea);
QWidget * labelsWidget = new QWidget;
labelsLayout = new QVBoxLayout(labelsWidget);
scrollArea->setWidget(labelsWidget);
addNewKnob(); // to fit size initially
}
void MyDialog::addNewKnob()
{
labelsLayout->addWidget(new QLabel("Hello World"));
}
qt.h:
#include <QMainWindow>
#include <QBoxLayout>
class MyDialog : public QMainWindow
{
Q_OBJECT
public:
MyDialog( );
private slots:
void addNewKnob();
private:
QBoxLayout * labelsLayout;
};
You have containerWidget that contain only one QScrollArea. I don't know why do you need this. But if you need this for some reason, you need to add a layout to this widget in order to make layouts work. Also do not create a layout for QScrollArea. It already have internally implemented layout. You should add scrollLayout to the scroll area's viewport() widget instead.
When you construct a layout and pass a widget to its constructor, the layout is automatically assigned to the passed widget. You should not call setLayout after that. This action will take no effect and produce console warning.
Related
EDIT:
NOTE this only occurs when the button is in a SUBMENU. (Menu in a menu.) This code works fine only on the parent menu!
Running Qt 5.0.2, on Windows 7. I have a QMenu with a QWidgetAction in it. Inside the QWidgetAction is a QPushButton. I would like to change the background color of the button when the mouse hovers over it.
Here is my code:
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QDebug>
#include <QMenu>
#include <QWidgetAction>
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::on_pushButton_clicked()
{
QMenu menu;
QMenu *subMenu = new QMenu("SubMenu text");
QWidgetAction *widgetAction = new QWidgetAction(subMenu);
QPushButton *btn = new QPushButton("test");
btn->setStyleSheet("QPushButton:hover{background-color: #ff0000;}");
widgetAction->setDefaultWidget(btn);
subMenu->addAction(widgetAction);
menu.addMenu(subMenu);
menu.exec();
}
.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
private slots:
void on_pushButton_clicked();
private:
Ui::MainWindow *ui;
};
#endif // MAINWINDOW_H
main.cpp
#include "mainwindow.h"
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}
However when the cursor hovers over the QPushButton the background color doesn't change. Doesn't matter if I run it in fusion style or not.
What is going on here? Thanks for your time.
This sound like mouseTracking is not enabled on the widget (and/or probably on the parent widget(s)). You can enable it by calling
QWidget::setMouseTracking(bool enable);
Background may not be customized, if you don't change a border style of a button.
How to solve: use some non-default style, for example:
const auto fusion = QStyleFactory::create( "Fusion" );
QApplication::setStyle( fusion );
QPushButton is not designed for perfect handling hover events. For example, hover event will not change a font via stylesheet.
How to solve: use QToolButton instead.
P.S. Don't know, why it's not worked for you. Everything is OK for me...
UPDATE
Just copy-paste it and run:
#include <QApplication>
#include <QWidgetAction>
#include <QMenu>
#include <QPushButton>
#include <QToolButton>
#include <QStyleFactory>
void showMenu()
{
const auto parent = qApp->activeWindow();
auto menu = new QMenu( parent );
auto root = new QMenu( "Root", menu );
menu->addMenu( root );
auto wa = new QWidgetAction( parent );
auto tb = new QToolButton;
tb->setText( "ToolBtn" );
wa->setDefaultWidget( tb );
root->addAction( wa );
menu->exec( QCursor::pos() );
menu->deleteLater();
}
int main(int argc, char *argv[])
{
QApplication a( argc, argv );
const auto fusion = QStyleFactory::create( "Fusion" );
const auto qss =
"QToolButton:!hover{background-color: #00ff00;}"
"QToolButton:hover{background-color: #ff0000;}"
;
QApplication::setStyle( fusion );
qApp->setStyleSheet( qss );
QWidget w;
w.resize( 800, 600 );
auto btn = new QPushButton{ "Test", &w };
QObject::connect( btn, &QPushButton::clicked, &showMenu );
w.show();
return a.exec();
}
I have a custom widget with some standard child widgets inside. If I make a separate test project and redefine my custom widget to inherit QMainWindow, everything is fine. However, if my custom widget inherits QWidget, the window opens, but there are no child widgets inside.
This is the code:
controls.h:
#include <QtGui>
#include <QVBoxLayout>
#include <QLineEdit>
#include <QPushButton>
class Controls : public QWidget
{
Q_OBJECT
public:
Controls();
private slots:
void render();
private:
QWidget *frame;
QWidget *renderFrame;
QVBoxLayout *layout;
QLineEdit *rayleigh;
QLineEdit *mie;
QLineEdit *angle;
QPushButton *renderButton;
};
controls.cpp:
#include "controls.h"
Controls::Controls()
{
frame = new QWidget;
layout = new QVBoxLayout(frame);
rayleigh = new QLineEdit;
mie = new QLineEdit;
angle = new QLineEdit;
renderButton = new QPushButton(tr("Render"));
layout->addWidget(rayleigh);
layout->addWidget(mie);
layout->addWidget(angle);
layout->addWidget(renderButton);
frame->setLayout(layout);
setFixedSize(200, 400);
connect(renderButton, SIGNAL(clicked()), this, SLOT(render()));
}
main.cpp:
#include <QApplication>
#include "controls.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
Controls *controls = new Controls();
controls->show();
return app.exec();
}
This opens up a window with correct dimensions, but with no content inside.
Bear in mind this is my first day using Qt. I need to make this work without inheriting QMainWindow because later on I need to put this on a QMainWindow.
You're missing a top level layout:
Controls::Controls()
{
... (yoour code)
QVBoxLayout* topLevel = new QVBoxLayout(this);
topLevel->addWidget( frame );
}
Or, if frame is not used anywhere else, directly:
Controls::Controls()
{
layout = new QVBoxLayout(this);
rayleigh = new QLineEdit;
mie = new QLineEdit;
angle = new QLineEdit;
renderButton = new QPushButton(tr("Render"));
layout->addWidget(rayleigh);
layout->addWidget(mie);
layout->addWidget(angle);
layout->addWidget(renderButton);
setFixedSize(200, 400);
connect(renderButton, SIGNAL(clicked()), this, SLOT(render()));
}
Note that setLayout is done automatically when QLayout is created (using parent widget)
You'll want to set a layout on your Controls class for managing its child sizes. I'd recommend removing your frame widget.
controls.cpp
Controls::Controls()
{
layout = new QVBoxLayout(this);
.
.
.
}
main.cpp
int main(int argc, char* argv[])
{
QApplication app(argc, argv);
MainWindow w;
w.show();
return app.exec();
}
I was trying to add a QWidget while runtime in Qt but It is showing SIGSEV signal received from OS because of segmentation fault.
Here is my code:
//mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QLabel>
#include <QLineEdit>
#include <QVBoxLayout>
#include <QtGui>
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
private slots:
void on_pushButton_submit_clicked();
private:
Ui::MainWindow *ui;
QLabel *label;
QLineEdit *line_edit;
};
#endif // MAINWINDOW_H
//mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::on_pushButton_submit_clicked()
{
QString str = ui->lineEdit1->text();
QString str1 =ui->lineEdit2->text();
if(str=="rana"&&str1=="vivek")
{
label = new QLabel();
label->setText("Success");
MainWindow.layout->addWidget(label);
label->show();
}
else
{
line_edit = new QLineEdit();
line_edit->setText("Sorry");
MainWindow.layout->addWidget(line_edit);
line_edit->show();
}
}
//main.cpp
#include "mainwindow.h"
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}
I know that segmentation fault occurs due to dereferencing of a null pointer but i couldn't find where I have done that mistake.Any Suggestions?
MainWindow.layout->addWidget(label);
doesn't make a lot of sense - this should not even compile, as Sebastian noted.
First, make sure you have layout in the Ui file (I added one vertical layout named verticalLayout), so you have a layout where you will add widgets. You will have a pointer to it inside your ui object.
Now, just use addWidget on that layout and everything should work:
void MainWindow::on_pushButton_submit_clicked()
{
QString str = ui->lineEdit1->text();
QString str1 =ui->lineEdit2->text();
if(str=="rana"&&str1=="vivek")
{
QLabel *label = new QLabel();
label->setText("Success");
ui->verticalLayout->addWidget(label);
// label->show(); widgets will became the part of the MainWindow, as the addWidget
// will add them into the hierarchy.
}
else
{
QLineEdit *line_edit = new QLineEdit();
line_edit->setText("Sorry");
ui->verticalLayout->addWidget(line_edit);
// line_edit->show()
}
}
Note - addWidget will set the owner of the widget to be the layout, so the widget will be deleted on the destruction of the layout.
Maybe implementing in this way will make sense?
void MainWindow::on_pushButton_submit_clicked()
{
QString str = ui->lineEdit1->text();
QString str1 =ui->lineEdit2->text();
QWidget *w = new QWidget(this);
QVBoxLayout *layout = new QVBoxLayout; // creates a vertical layout
if(str=="rana"&&str1=="vivek")
{
label = new QLabel(w);
label->setText("Success");
layout->addWidget(label);
}
else
{
line_edit = new QLineEdit(w);
line_edit->setText("Sorry");
layout->addWidget(line_edit);
}
w->setLayout(layout);
setCentralWidget(w);
}
UPDATE:
QMainWindow already has a predefined layout, so it was needless to introduce a new one. The code above creates an intermediate widget and construct it using its own layout. Than the widget set as a central widget in the MainWindow.
I am a QT newbie and trying to play around with Apps. I have just coded a very trivial App with some buttons. The main idea is to have a small "logo" in my App. LAter I would like to add some background image as well.
I have coded from an example App with a grid layout within which is a QBoxLayout which groups my buttons.
As you can see in my code, I have tried adding the Logo everywhere. When I added it in main.cpp, I have two views one showing buttons and the other my logo. Of course I do not want this. So I tried adding it in mainwindow.cpp but in this case, I don't see my Logo appearing anywhere at all :(
Please advise.
Here is the code:
main.cpp:
#include <QtGui/QApplication>
#include <QGraphicsScene>
#include <QGraphicsView>
#include <QGraphicsPixmapItem>
#include "mainwindow.h"
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
Window window;
window.show();
/*
QGraphicsScene scene;
QGraphicsView view(&scene);
QGraphicsPixmapItem item(QPixmap("/home/marc/Desktop/Niranjana/Images/logo.9.png"));
scene.addItem(&item);
view.show();
*/
return a.exec();
}
mainwindow.h
#ifndef WINDOW_H
#define WINDOW_H
#include <QWidget>
#include <QRadioButton>
class QGroupBox;
class Window : public QWidget
{
Q_OBJECT
public:
Window(QWidget *parent = 0);
void onCheck_remote(int flag);
void onCheck_local(int flag);
private:
QRadioButton *button_local;
QRadioButton *button_remote;
QGroupBox *createPushButtonGroup();
};
#endif
mainwindow.cpp
#include <QtGui>
#include <QGraphicsScene>
#include <QGraphicsView>
#include <QGraphicsPixmapItem>
#include "mainwindow.h"
Window::Window(QWidget *parent)
: QWidget(parent)
{
QGridLayout *grid = new QGridLayout;
QGraphicsScene scene;
QGraphicsPixmapItem item(QPixmap("/home/test/logo.png"));
QGraphicsView view(&scene);
scene.addItem(&item);
view.show();
grid->addWidget(view.viewport(), 1, 1);
grid->addWidget(createPushButtonGroup(), 2, 1);
setLayout(grid);
setWindowTitle(tr("My App"));
resize(480, 420);
}
QGroupBox *Window::createPushButtonGroup()
{
QGroupBox *groupBox = new QGroupBox();
/*
QGraphicsScene scene;
QGraphicsPixmapItem item(QPixmap("/home/marc/Desktop/Niranjana/Images/logo.9.png"));
QGraphicsView view(&scene);
scene.addItem(&item);
scene.setBackgroundBrush(Qt::white);
view.show();
*/
QPushButton *button1 = new QPushButton(tr("&Start"));
QPushButton *button2 = new QPushButton(tr("&Stop"));
button_local = new QRadioButton(tr("&with power"));
button_remote = new QRadioButton(tr("without power"));
button_local->setChecked(1);
QVBoxLayout *vbox = new QVBoxLayout;
// vbox->addSpacing(10);
// vbox->addWidget(view.viewport());
//vbox->addSpacing(10);
vbox->addWidget(button1);
vbox->addSpacing(10);
vbox->addWidget(button2);
vbox->addSpacing(50);
vbox->addWidget(button_local);
vbox->addWidget(button_remote);
vbox->addStretch(1);
groupBox->setLayout(vbox);
return groupBox;
}
You should
Make your scene, view, item pointer members of your window class
Instantiate them in your Window ctor
do grid->addWidget(view, 1, 1);
Otherwise, all the items instantiated on the stack in the ctor will get deleted when exiting.
Greetings all,
Is there any widget to separate two QWidgets and also give full focus to a one widget.
As shown in following figure ?
Thanks in advance,
umanga
How about QSplitter?
QWidget 1, for exmaple, QListView. QWidget 2 is a combination of QWidgets (the left part is simple QPushButton with show/hide caption, and the right part another widget)... All you have to do, is to hide your QWidget2 when user clicked on QPushButton...
If you need an example, I may post it.
Updated
main.cpp
#include "splitter.h"
#include <QtGui/QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
splitter w;
w.show();
return a.exec();
}
splitter.h
#ifndef SPLITTER_H
#define SPLITTER_H
#include <QtGui/QDialog>
class splitter : public QDialog
{
Q_OBJECT;
QWidget* widget1;
QWidget* widget2;
QPushButton* button;
public:
splitter(QWidget *parent = 0, Qt::WFlags flags = 0);
~splitter();
private slots:
void showHide(void);
};
#endif // SPLITTER_H
splitter.cpp
#include <QtGui>
#include "splitter.h"
splitter::splitter(QWidget *parent, Qt::WFlags flags)
: QDialog(parent, flags)
{
QApplication::setStyle("plastique");
QListView* listView = new QListView;
QTableView* tableView = new QTableView;
button = new QPushButton("Hide >");
widget1 = new QWidget;
QHBoxLayout* w1Layout = new QHBoxLayout;
w1Layout->addWidget(listView);
w1Layout->addWidget(button);
widget1->setLayout(w1Layout);
widget2 = new QWidget;
QHBoxLayout* w2Layout = new QHBoxLayout;
w2Layout->addWidget(tableView);
widget2->setLayout(w2Layout);
QSplitter *mainSplitter = new QSplitter(this);
mainSplitter->addWidget(widget1);
mainSplitter->addWidget(widget2);
connect(button, SIGNAL(clicked()), this, SLOT(showHide()));
QVBoxLayout *mainLayout = new QVBoxLayout;
mainLayout->addWidget(mainSplitter);
setLayout(mainLayout);
}
splitter::~splitter()
{}
void splitter::showHide(void)
{
if (widget2->isVisible())
{ // hide
widget2->setVisible(false);
button->setText("< Show");
}
else
{ // show
widget2->setVisible(true);
button->setText("Hide >");
}
}