Adding QGridLayout to a QVBoxLayout

MaxDevI

Hello,
I am fairly new to Qt and have a pretty simple question about layouts.
I have a QVBoxLayout that is the main layout for my application. Then I make a new QGridLayout, add some stuff to it, and then I add the QGridLayout to the QVBoxLayout using boxLayout->addLayout(gridLayout).
This works, and makes the things that I added to the QGridLayout appear on my QVBoxLayout, but they are at the top of the page. I can't seem to find out how to reposition the items to where I want them, which is at the bottom of the page.
I hope this is a simple fix, and I am just a bit too tired today. Thanks for any help and ideas.

----------EDIT----------

Okay, so I have managed to get the QPushButtons out of the layouts causing all these problems. Now this is what I basically have

button1 = new QPushButton("name1", centralWidget);
button2 = new QPushButton("name2", centralWidget);
button3 = new QPushButton("name3", centralWidget);

where centralWidget is the centralWidget and child of the QMainWindow.

These 3 buttons all appear in the top left corner, one on top of the other, as expected (?). All I want to do is move them to the bottom and lay them out in a QHBoxLayout. The only problem is, there is some other page/tab taking up the whole bottom of the screen, which is not directly associated with the centralWidgetLayout (to my knowledge?). I want to make enough room for the 3 buttons at the bottom of the page.

I will probably make this a new post and add some pictures tomorrow.

MaxDevI

I have been looking into the insertWidget function and have been able to move the buttons a bit farther down the page. I hope I can correctly format the rest.

Paul Colby

Hi @MaxDevI,

Try invoking QVBoxLayout::addStretch() on the vbox before you add the grid layout.

(I don't have the tools to try it myself right now, but that's what I'd try first)

Cheers.

MaxDevI

Hi @Paul-Colby, thanks for the response. I tried adding stretch but all that did was make more space between the things at the top and the rest of the stuff. The items I want at the bottom are still at the very top.

Paul Colby

Can you show us your vbox and grid layout code? I'm not understanding what you mean by "rest of the stuff" and "items I want a the bottom" etc. Code will be easier to understand :)

MaxDevI

Sadly I cannot as per company policies. I can try to mock up a version without any pertinent information or variable names, but I will most likely find a solution before I find the energy to do that XD. Also, the code is very messy and layouts are instantiated everywhere so it is even a bit confusing to me how it is set up. Thanks anyway though!

MaxDevI

Okay, so I have managed to get the QPushButtons out of the layouts causing all these problems. Now this is what I basically have

button1 = new QPushButton("name1", centralWidget);
button2 = new QPushButton("name2", centralWidget);
button3 = new QPushButton("name3", centralWidget);

where centralWidget is the centralWidget and child of the QMainWindow.

These 3 buttons all appear in the top left corner, one on top of the other, as expected (?). All I want to do is move them to the bottom and lay them out in a QHBoxLayout. The only problem is, there is some other page/tab taking up the whole bottom of the screen, which is not directly associated with the centralWidgetLayout (to my knowledge?). I want to make enough room for the 3 buttons at the bottom of the page.

I will probably make this a new post and add some pictures tomorrow.

Paul Colby

@MaxDevI said in Adding QGridLayout to a QVBoxLayout:

These 3 buttons all appear in the top left corner, one on top of the other, as expected (?). All I want to do is move them to the bottom and lay them out in a QHBoxLayout.

Try this:

#include <QHBoxLayout>
#include <QPushButton>
#include <QVBoxLayout>

MainWindow::MainWindow(QWidget *parent, Qt::WindowFlags flags) : QMainWindow(parent, flags) {
    // A horizontal box of three buttons.
    QHBoxLayout * const buttonsBox = new QHBoxLayout(this);
    buttonsBox->addWidget(new QPushButton("name1"));
    buttonsBox->addWidget(new QPushButton("name2"));
    buttonsBox->addWidget(new QPushButton("name3"));

    // A veritcal box with all the space at the top.
    QVBoxLayout * const vBox = new QVBoxLayout(this);
    vBox->addStretch();          // This will expand to all available vertical space.
    vBox->addLayout(buttonsBox); // This will expand to it's sizeHint height.

    // Add a central widget, and assign our vBox layout.
    setCentralWidget(new QWidget);
    centralWidget()->setLayout(vBox);
}

Cheers.