How to make a SVG at tab Widget ?

[RiceBall]

@jsulm said in How to make a SVG at tab Widget ?:

@RiceBall said in How to make a SVG at tab Widget ?:

QGraphicsView view(scene);
view.show();

You're creating local QGraphicsView instance which is destroyed as soon as it goes out of scope (by the way you did not say where you actually have this code). Also check whether the paths are correct and what https://doc.qt.io/qt-5/qimage.html#isNull returns.

"How could I replace above "QGraphicsView view(scene)"" - just use the view from ui->?

1. I use it at Mainwindow.
   As you say, I can see it is shown suddenly then it is gone.
2. I use graphic View UI at mainwindow.ui.
   How could I fix code about QGraphicsView view(scene)?

attachment is my code.
https://drive.google.com/open?id=17mOeeA11xWIo17LzSuDw6pcf9QvLePnH

[mrjj]

Hi
I assume you want to use the one you put in the tab ?

QGraphicsView view(scene);
view.show();

ui->graphicsView->setScene(scene);

[RiceBall]

@mrjj said in How to make a SVG at tab Widget ?:

Hi
I assume you want to use the one you put in the tab ?

QGraphicsView view(scene);
view.show();

ui->graphicsView->setScene(scene);

Thank you for your reply.
It looks like have loading something.

But as you say , I think it just only show one moment.
Where is wrong?

[Devopia53]

@RiceBall

like this:

graphicsView->scene()->addWidget(new QSvgWidget(":/your.svg"));

[RiceBall]

@Devopia53 said in How to make a SVG at tab Widget ?:

@RiceBall

like this:

graphicsView->scene()->addWidget(new QSvgWidget(":/your.svg"));

Thank you for your reply.
I try to fix it.
But it show following message.

[Devopia53]

@RiceBall

first, in .pro

QT += svg

and then add

#include <QSvgWidget>

[Pradeep P N]

@RiceBall
Add QT += svg in .pro file

Refer Rendering SVG Files

[RiceBall]

@Devopia53
@Pradeep-P-N said in How to make a SVG at tab Widget ?:

@RiceBall
Add QT += svg in .pro file

Refer Rendering SVG Files

I try to fix it.
It almost pass all compile.
But it show "The process was ended forcefully."

[jsulm]

@RiceBall said in How to make a SVG at tab Widget ?:

But it show "The process was ended forcefully."

Please debug and tell us where exactly it crashes...

[RiceBall]

@jsulm said in How to make a SVG at tab Widget ?:

@RiceBall said in How to make a SVG at tab Widget ?:

But it show "The process was ended forcefully."

Please debug and tell us where exactly it crashes...

[jsulm]

@RiceBall Please show the whole content of your MainWindow constructor, especially line 31.
I guess it is the one you posted in a screen-shot before? It would be helpful if you would simply copy/paste the code instead of posting screen-shots.
It looks like your scene was not yet initialised.

[RiceBall]

@jsulm said in How to make a SVG at tab Widget ?:

@RiceBall Please show the whole content of your MainWindow constructor, especially line 31.
I guess it is the one you posted in a screen-shot before? It would be helpful if you would simply copy/paste the code instead of posting screen-shots.
It looks like your scene was not yet initialised.

I tried to simple it.
But the problem is the same.

.
mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QtGlobal>
#include <QMovie>
#include <QSvgWidget>
#include <QPixmap>
#include <QGraphicsScene>
#include <QGraphicsPixmapItem>
#include <QGraphicsView>

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

   ui->graphicsView->scene()->addWidget(new QSvgWidget("../untitled6/splash1.svg"));

}

MainWindow::~MainWindow()
{
    delete ui;
}

[jsulm]

@RiceBall Did you set the scene?
https://doc.qt.io/qt-5/qgraphicsview.html#setScene

[RiceBall]

@jsulm said in How to make a SVG at tab Widget ?:

@RiceBall Did you set the scene?
https://doc.qt.io/qt-5/qgraphicsview.html#setScene

No.I don't set any scene.
Should I need to set it by " QGraphicsScene scene " at mainwindow.cpp ??? Or Not ?

[jsulm]

@RiceBall Well https://doc.qt.io/qt-5/qgraphicsview.html#scene says
"Returns a pointer to the scene that is currently visualized in the view. If no scene is currently visualized, 0 is returned."
I would say you have to set a scene as shown here https://doc.qt.io/qt-5/qgraphicsview.html

QGraphicsScene scene;
scene.addText("Hello, world!");

QGraphicsView view(&scene); // use setScene() instead
view.show();

[RiceBall]

@jsulm said in How to make a SVG at tab Widget ?:

@RiceBall Well https://doc.qt.io/qt-5/qgraphicsview.html#scene says
"Returns a pointer to the scene that is currently visualized in the view. If no scene is currently visualized, 0 is returned."
I would say you have to set a scene as shown here https://doc.qt.io/qt-5/qgraphicsview.html

QGraphicsScene scene;
scene.addText("Hello, world!");

QGraphicsView view(&scene); // use setScene() instead
view.show();

I try to fix it as your recommend.
But it will shown "no viable conversion from 'QGraphicsScene' to ' QGraphicsScene *'"
Where should I need to change ?

[Pradeep P N]

@RiceBall said in How to make a SVG at tab Widget ?:

'QGraphicsScene' to ' QGraphicsScene *'"

Please try ui->graphicView->setScene(&scene);

[mrjj]

Hi
Please notice you are killing the scene very fast.
Make it a member of the class.
Should live in class so it dont go out of scope,

[jsulm]

@RiceBall Please think about what you're doing instead of blindly copy/paste code snippets which meant to be simple examples.
First: don't create the scene on the stack!
Second: pass pointer to setScene (the error message actually tells you what is wrong).

[RiceBall]

@Pradeep-P-N said in How to make a SVG at tab Widget ?:

@RiceBall said in How to make a SVG at tab Widget ?:

'QGraphicsScene' to ' QGraphicsScene *'"

Please try ui->graphicView->setScene(&scene);

I success to show it finally.
Thanks @jsulm @Pradeep-P-N @mrjj help.

Key Point
.pro

QT       += svg 

final code

    QGraphicsScene *scene = new QGraphicsScene;
    scene->addWidget(new QSvgWidget("../untitled6/splash1.svg"));
    scene->addWidget(new QSvgWidget("../untitled6/splash2.svg"));

    ui->graphicsView->setScene(scene);