I have made a window in Qt C++ where inside I fill a table with items row by row. However, after I fill out enough rows, a scrollbar appears in order to allow me to scroll the extra rows. The problem is - when the scrollbar appears, it squeezes the table inwards. Is there some way to prevent this from happening?
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I am programming a game and I have a tab widget which takes up the majority of the window. I want to use the extra space in the tab bar for buttons. I have the tab widget in a grid layout. To accomplish this, I use the code below in order to remove and add back the button widgets to the desired areas (the solution to someone else's question).
ui->centralLayout->removeWidget(ui->exitButton);
ui->centralLayout->removeWidget(ui->ResizeButton);
ui->centralLayout->addWidget(ui->ResizeButton,0,4, Qt::AlignTop|Qt::AlignRight);
ui->centralLayout->addWidget(ui->exitButton,0,4, Qt::AlignTop|Qt::AlignRight);
This does not work for me; however, because I would like the second widget-- the resize button-- to be just to the left of the exit button. What is occurring is that it instead overlaps the exit button. I simply need to move it 21 pixels to the left and have no idea how!
I tried putting both buttons in a frame and then removing and adding the frame the way I did the buttons. Unfortunately the same functions I used do not exist for the qt frame object.
Here are some pictures of my window.
https://docs.google.com/document/d/17w5USWQcCtb6OdcRShdcYcRjXTcdVpmdrG5TWLX71y8/edit?usp=sharing
you are using void QGridLayout::addWidget(QWidget * widget, int row, int column, Qt::Alignment alignment = 0) overload.
2-nd and 3-rd parameters are row and column of a grid. And you put 2 widgets in the same cell so they are overlaping each other.
I solved my problem. Earlier when I was trying to add them to a frame and reposition it I could not but using a widget as the container for my buttons let me place them the way I was earlier attempting to individually place the buttons.
I would like the horizontal scroll bar to appear whenever there is text eliding. Such that the user won't have to resize the whole GUI. How would I do this?
This is what I have coded:
ui->tableWidget->horizontalHeader()->setStretchLastSection(true);
ui->tableWidget->horizontalHeader()->setSectionResizeMode(1,QHeaderView::Stretch);
ui->tableWidget->resizeColumnsToContents();
I also tried enabling scrollbar to appear always, but scrolling to the very right doesn't do anything.
If I set textElideMode to ElideNone , the text from the 2nd column is partially hidden and no scrollbar appears.
QHeaderView::Stretch will stretch the column width to the available space. Use QHeaderView::ResizeToContents to make the column wide enough to display the content, resulting in a horizontal scroll bar if necessary.
This will have a couple of side effects of which I'm not sure you want them.
There will probably be no more ellipsis in the elided text.
If all of the values in your Hash column are very small, then that column will be very thin, so there might be 'empty' space next to that column.
Consider there is a QTablWidget and a QTextEdit. Both of them are in a horisontal QSplitte. Let the QTable widget has 2 columns.
The problem is to resize the table columns' width as you do resize operation by moving the splitter with mouse. Are there any options to may colums to be resized synchornosly with the table?
Thanks.
QHeaderView *header = ui->tableWidget->horizontalHeader();
header->setResizeMode(QHeaderView::Stretch);
This code sets all columns of ui->tableWidget to equal width and let it change automatically.
And take a look on QHeaderView description in docs, you can do almost anything you can imagine with table columns with this API.
Sad, but you can't set any stretch factor or smth., if you need relational column widths not to be equal, but you still can reimplement sizeHint() or resize sections when header's geometriesChanged fires.
Apart from the fact I still can't see why this class fills columns and scrolls horizontally, rather than filling rows and scrolling vertically, I'm confused how the width of items is controlled. I'm seeing quite a lot of padding (50-80 pixels) between the longest item in a column and the next column which means wasted space.
Is it controllable?
Somebody else asked about scrolling, here is the answer.
If you are referring to column width then you can change it using:
CListCtrl list;
list.InsertColumn(0, _T("Column1"));
list.InsertItem(0, _T("Item with a long name"));
list.SetColumnWidth(0, LVSCW_AUTOSIZE_USEHEADER);
I want my custom widgets to gain extra space when the dialog is resized. This was working when I only had a handful of widgets, but after adding several more columns of these same widgets and putting them in a QGridLayout, the extra space merely goes in as padding between the widgets.
I've had trouble with this in the past and here are some of the things I've found:
First make sure all the widgets you want to expand have sizePolicy set to "Expanding".
Make sure the widgets that make up your custom widgets are in a layout that allows for expanding. You can check this by just adding one of your custom widgets to the window and seeing that it expands as expected.
Make sure any widgets on the form that you do not want to expand have a fixed (minimum=maximum) size in the dimension you want them to stay static.
Sometimes the grid layout causes some weird spacing issues because rows are resized based on the largest widget in the entire row and similarly for columns. For some layouts, it is better to use a vertical layout that contains horizontal layouts or vica versa to create a grid-like effect. Only this way, each sub-layout is spaced independently of the other rows or columns.
Controlling grid expansion programatically
I've found that you can easily control which columns/rows expand and which columns/rows stay fixed in width by using QGridLayout::setColumnStretch() and QGridLayout::setRowStretch(). You'll need to provide weights to the specific columns (0 for no stretch).
For example, if you want column 0 to not take up any room and column 1 to take the rest of the window's room, do this:
QGridLayout* layout ;
// Set up the layout
layout->setColumnStretch( 0, 0 ) ; // Give column 0 no stretch ability
layout->setColumnStretch( 1, 1 ) ; // Give column 1 stretch ability of ratio 1
Controlling grid expansion using Qt Designer
You can do what I described above if you're using Designer. Just look for the widget properties layoutRowStretch and layoutColumnStretch. It'll contain a comma-separated list of integers.
Another option is inside of QT Creator, to specify in the top level layout widget of the section you want fixed size a layoutSizeConstraint of "SetFixedSize". You must also remove all spacers from beneath that widget. In my case, I had a dialog with a TreeWidget, a Table, and some color selection stuff. I wanted the color selection controls to remain the same size horizontally, so they were in a VerticalLayout. I imagine you can do the same with a HorizontalLayout too if you want things to stay the same height. IF you really need spacers inside the layout, you can probably use blank labels with fixed size.