CODEWITHSUNDEEP
c++qt
Romain
Romain

Reputation: 3673

How to show a QString in a QVBoxLayout

I'm trying to put a title just before a QSLider so the user know what the QSlider is for. I have 2 QSlider in a QDialog Box set on a QVBoxLayout like this :

QSlider * slider1 = new QSlider(Qt::Horizontal);
QSlider * slider2 = new QSlider(Qt::Horizontal);

QDialog * opts = new QDialog;
QVBoxLayout * layout = new QVBoxLayout;

layout->addWidget(Qstring("Label for Slider 1"));
layout->addWidget(slider1);
layout->addWidget(QString("Label for Slider 2"));
layout->addWidget(slider2);

opts->setLayout(layout);
opts->show();

Now the sliders works just fine, but I can't show the text. And I've found absolutely nothing about a thing like this, whatsoever. How can I just show a String in a QVBoxLayout ?

Upvotes: 0

Views: 1212

Answers (1)

Tay2510
Tay2510

Reputation: 5978

What's wrong?

You can't directly add QString like that, since QString is just a convenient class for string operation and it's not responsible for UI display.

Solution:

You need a instance of QLabel to hold your QString:

QLabel *label_1 = new QLabel(this);
label_1->setText("Label for Slider 1");
layout->addWidget(label_1);
layout->addWidget(slider1);

Better layouts:

In addition, you may consider using nested layout: create a new horizontal layout that holds one QLabel and one QSlider, then add the layout into your dialog layout.

Here is the code:

QSlider * slider1 = new QSlider(Qt::Horizontal);
QSlider * slider2 = new QSlider(Qt::Horizontal);

QDialog * opts = new QDialog;
QVBoxLayout * layout = new QVBoxLayout; // layout for Dialog itself
QHBoxLayout * layout_1 = new QHBoxLayout(this); // layout for slider1 & label1
QHBoxLayout * layout_2 = new QHBoxLayout(this); // layout for slider2 & label2

QLabel *label_1 = new QLabel(this);
QLabel *label_2 = new QLabel(this);
label_1->setText("Label for Slider 1");
label_2->setText("Label for Slider 2");

layout_1->addWidget(label_1);    
layout_1->addWidget(slider1); // [Label_1][Slider1]

layout_2->addWidget(label_2);    
layout_2->addWidget(slider2); // [Label_2][Slider2]

layout->addLayout(layout_1);
layout->addLayout(layout_2);    
opts->setLayout(layout);
opts->show();

P.S. I strongly recommend you using designer to deploy your widget layouts.

Upvotes: 2

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