I have read a documentation and aswell many sites on website.
Unfortunatly I didn't find answer to my question.
Is there any chance(I believe there is) to fill background outside the popup window? Let me explain: If i have window like of my whole app with resolution 500x500 [px] and I create a popup window 300x300 in the middle - it means I have 200 px in each side "parent-window". Is there any chance (method, flag) to fill background in gray color?
Image: https://imgur.com/Hunev58
Modifying the palette does the job. Here you get a purple background when the MessageBox is shown , and come back to normal once clicked
#include <QApplication>
#include <QMainWindow>
#include <QVBoxLayout>
#include <QLabel>
#include <QPushButton>
#include <QMessageBox>
#include <QPalette>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QMainWindow w;
QVBoxLayout mainLayout;
QLabel foolabel("FooLabel");
QPushButton foobutton("FooButton");
mainLayout.addWidget(&foolabel);
mainLayout.addWidget(&foobutton);
QWidget window;
window.setLayout(&mainLayout);
w.setCentralWidget(&window);
QPalette palette = QApplication::palette(&w);
palette.setColor(QPalette::Inactive,QPalette::Window,QColor(138,43,226));
w.setPalette(palette);
w.show();
QMessageBox box(&w);
box.exec();
return a.exec();
}
Related
I tried launching my window this way:
#include "stdafx.h"
#include "mainwindow.h"
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
{
ui.setupUi(this);
setWindowOpacity(0);
QGraphicsOpacityEffect* eff = new QGraphicsOpacityEffect(this);
QPropertyAnimation* ani = new QPropertyAnimation(eff, "windowOpacity");
ani->setDuration(3000);
ani->setStartValue(0);
ani->setEndValue(1);
ani->setEasingCurve(QEasingCurve::OutBack);
ani->start(QPropertyAnimation::DeleteWhenStopped);
}
#include "mainwindow.h"
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}
But the window never became visible, I would like to it be initialized with a fade in effect.
What's the proper way to achieve it?
Two issues I see. First, as originally written, your main function is going to exit immediately after opening the window. Add return a.exec(); at the end of main.
Next, you are animating QGraphicsOpacityEffect. As written, your example code has no connection between QGraphicsOpacityEffect and the window. Your animation is animating the property on the effect class, but that doesn't propagate back to the widget. There is no need to use QGraphicsOpacityEffect. Instead, just animate the widget directly:
ui.setupUi(this);
setWindowOpacity(0);
// Notice that the first argument passed in is 'this' - the widget.
// the widget is what you want to animate.
QPropertyAnimation* ani = new QPropertyAnimation(this, "windowOpacity");
ani->setDuration(3000);
ani->setStartValue(0);
ani->setEndValue(1);
ani->setEasingCurve(QEasingCurve::OutBack);
ani->start(QPropertyAnimation::DeleteWhenStopped);
How to show more number(folder) of images in Qlabel or QScrollArea?
QImage image("E:/Raul/Images");
ui.label->setPixmap(QPixmap::fromImage(image));
Like this but i want more number images will load in one label.
Result:
Code:
#include <QApplication>
#include <QLabel>
#include <QLineEdit>
#include <QPointer>
#include <QPushButton>
#include <QVBoxLayout>
#include <QWizardPage>
#include <QDebug>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QWidget widget;
QVBoxLayout *layout=new QVBoxLayout();
QLabel *label=new QLabel("<img src=:/0_0.jpg align=middle><img src=:/0_1.jpg align=middle><strong>Hello</strong> "
"<font color=red>Sai Raul!");
layout->addWidget(label);
widget.setLayout(layout);
widget.show();
return a.exec();
//
}
QLabel is not a web browser, therefore hyperlinks like <img src=/media/cc0-images/grapefruit-slice-332-332.jpg/> doesn't work, but why images from resources can not do it))).
Bellow you can see minimal example code to demonstrate problem.
If you run it and give focus to QLineEdit, you get output every second: paintEvent, paintEvent and so on.
I can not understand why MyW::paintEvent called on every
cursor blinking in child widget? As you see I do not configure QLineEdit,
by default on my linux box it have no transparent elements,
but still for some reason cursor cause all widgets to redraw their content?
#include <QApplication>
#include <QWidget>
#include <QPaintEvent>
#include <QPainter>
#include <QLineEdit>
class MyW final : public QWidget {
public:
MyW() {
//setAutoFillBackground(false);
}
void paintEvent(QPaintEvent *e) {
e->accept();
qDebug("paintEvent");
QPainter painter{this};
painter.fillRect(rect(), Qt::green);
}
};
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
MyW w;
w.resize(600, 600);
w.show();
auto le = new QLineEdit{&w};
le->show();
return app.exec();
}
i have a fixed size QGraphicsview and my own class QGraphWidget class
GraphWidget::GraphWidget(QWidget *parent)
:QGraphicsView(parent)
{
QGraphicsScene *scene = new QGraphicsScene(this);
setScene(scene);
scale(1,-1);
setWindowTitle(tr("Poly"));
}
void GraphWidget::showPoly(){
scene()->clear();
scene()->setSceneRect(QRectF());
QPolygonF polygon;
QPen pen(Qt::black,1);
QBrush brush(Qt::black);
brush.setStyle(Qt::SolidPattern);
polygon<< QPointF(0,0)<< QPointF(10,0)<< QPointF(15,20)<<QPointF(5,10);
;
QGraphicsPolygonItem *polyItem=scene()->addPolygon(polygon,pen);
fitInView(polyItem);
}
It is possible that the scene focus the polygon and zoom it ?
I tried fitinView() or setSceneRect() but nothing worked, the polygon is still very small.
EDIT
with fitInView(polyItem->boundingRect());
The problem is that my QGraphicsview is fixed, so the fit in view has to zoom in. It can't change the size of the Qgraphicsview
So i got the answer.
The problem was that i called showPoly() inside of the constructor. But on this moment the size of the Qgraphicsview was not fixed.
I use a work around with QSingleShot
#include "mainwindow.h"
#include <QApplication>
#include <QTimer>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
QTimer::singleShot(1, &w,SLOT(callShowPoly()));
return a.exec();
}
Basically, I want a simple pushButton with a colorful text which when pressed exits the application.
Why cant I press PushButton in this simple program. I am using QT 4.6 on Arch x86_64.
#include <QtGui/QApplication>
#include <QLabel>
#include <QPushButton>
#include<QtGui>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QMainWindow *Main=new QMainWindow;
QPushButton *button = new QPushButton(Main);
QLabel *label = new QLabel(Main);
label->setText("<h2><i>Hello</i> ""<font color=red>Qt!</font></h2>");
label->setVisible(true);
QObject::connect(button, SIGNAL(clicked()),label, SLOT(close()));
label->setAlignment(Qt::AlignCenter|Qt::AlignVCenter);
label->setWindowTitle("HelloWorld Test Program");
Main->show();
return a.exec();
}
Beside the use of a button class that will allow you to display rich text, you also need to make sure your connections are correct.
In your example, you're connecting the clicked signal of the button to the clear() slot of the label, which is non-sense.
To exit your app when the button is clicked, you need to close the main window. Here is the code to get the right connection :
QObject::connect(button, SIGNAL(clicked()),Main, SLOT(close()));
Changing this single line of code in your example is not enough, because your label is drawn on top of your button, so it's not possible to graphically click on it. You need to hide your label and put some text into your button :
button->setText("Hello");
label->setVisible(false);
Regarding the rich text feature in a QPushButton, AFAIK it is not possible to do it with a QPushButton.
UPDATE :
Here is a way to put some richtext on a QPushButton. It uses the solution described by my comment : painting a QTextDocument onto a pixmap and setting this pixmap as the button's icon.
#include <QtGui/QApplication>
#include <QLabel>
#include <QPushButton>
#include <QtGui>
#include <QTextDocument>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QMainWindow *Main=new QMainWindow;
QPushButton *button = new QPushButton(Main);
QTextDocument Text;
Text.setHtml("<h2><i>Hello</i> ""<font color=red>Qt!</font></h2>");
QPixmap pixmap(Text.size().width(), Text.size().height());
pixmap.fill( Qt::transparent );
QPainter painter( &pixmap );
Text.drawContents(&painter, pixmap.rect());
QIcon ButtonIcon(pixmap);
button->setIcon(ButtonIcon);
button->setIconSize(pixmap.rect().size());
QObject::connect(button, SIGNAL(clicked()),Main, SLOT(close()));
Main->show();
return a.exec();
}
Take a look here. Widget called QwwRichTextButton.
The QwwRichTextButton widget provides a button that can display rich text.