Category Archive : Qt layout spacing

2 Oct, 2012 | Totaur | Comments

Qt layout spacing

The QBoxLayout class lines up child widgets horizontally or vertically. QBoxLayout takes the space it gets from its parent layout or from the parentWidgetdivides it up into a row of boxes, and makes each managed widget fill one box. If the QBoxLayout's orientation is Qt::Horizontal the boxes are placed in a row, with suitable sizes. Each widget or other box will get at least its minimum size and at most its maximum size.

Any excess space is shared according to the stretch factors more about that below. If the QBoxLayout's orientation is Qt::Verticalthe boxes are placed in a column, again with suitable sizes. The easiest way to create a QBoxLayout is to use one of the convenience classes, e. If the QBoxLayout is not the top-level layout i.

Use insertWidgetinsertSpacinginsertStretch or insertLayout to insert a box at a specified position in the layout. The margin default is provided by the style. The default margin most Qt styles specify is 9 for child widgets and 11 for windows. The spacing defaults to the same as the margin width for a top-level layout, or to the same as the parent layout.

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To remove a widget from a layout, call removeWidget. Calling QWidget::hide on a widget also effectively removes the widget from the layout until QWidget::show is called. See also insertLayoutaddItemand addWidget. See also addSpacing and addStretch. Adds a non-stretchable space a QSpacerItem with size size to the end of this box layout.

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QBoxLayout provides default margin and spacing. This function adds additional space. Adds a stretchable space a QSpacerItem with zero minimum size and stretch factor stretch to the end of this box layout. Limits the perpendicular dimension of the box e.QGridLayout takes the space made available to it by its parent layout or by the parentWidgetdivides it up into rows and columns, and puts each widget it manages into the correct cell.

Columns and rows behave identically; we will discuss columns, but there are equivalent functions for rows. Each column has a minimum width and a stretch factor. The minimum width is the greatest of that set using setColumnMinimumWidth and the minimum width of each widget in that column. The stretch factor is set using setColumnStretch and determines how much of the available space the column will get over and above its necessary minimum.

Normally, each managed widget or layout is put into a cell of its own using addWidget. It is also possible for a widget to occupy multiple cells using the row and column spanning overloads of addItem and addWidget.

Qt Documentation

To remove a widget from a layout, call removeWidget. Calling QWidget::hide on a widget also effectively removes the widget from the layout until QWidget::show is called. This illustration shows a fragment of a dialog with a five-column, three-row grid the grid is shown overlaid in magenta :. Columns 1 and 3 are placeholders made with setColumnMinimumWidth. We used placeholder columns 1 and 3 to get the right amount of space between the columns.

Note that the columns and rows are not equally wide or tall. If you want two columns to have the same width, you must set their minimum widths and stretch factors to be the same yourself. If the QGridLayout is not the top-level layout i. The normal way to add a layout is by calling addLayout on the parent layout. Once you have added your layout you can start putting widgets and other layouts into the cells of your grid layout using addWidgetaddItemand addLayout.

QGridLayout also includes two margin widths: the contents margin and the spacing. The contents margin is the width of the reserved space along each of the QGridLayout's four sides. The spacing is the width of the automatically allocated spacing between neighboring boxes. The default contents margin values are provided by the style.

The default value Qt styles specify is 9 for child widgets and 11 for windows.Your browser does not seem to support JavaScript.

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As a result, your viewing experience will be diminished, and you may not be able to execute some actions. Please download a browser that supports JavaScript, or enable it if it's disabled i. I have a widget with 3 text boxes underneath each other. All margins of this widget is set to 0. The default spacing is left at 6. I want the widget to have no spacing between the child widgets an its border.

Hence the only place where there should be visible space is between textbox1 and textbox2; and textbox2 and textbox3. Everything looks perfect if all 3 text boxes are visible. The problem is that I want to dynamically hide the last text box. When I hide it, there is still some space left between textbox2 and the bottom of the parent widget.

I assume this is the 6px spacing, since the margins are at 0px. When I hide textbox3, textbox2 is the last one in the widget. How can I remove the space underneath it? If I set the layout's spacing to 0, textbox1 and textbox2 are touching, which I don't want.

I basically want all spacing to stay at 6px, except if the spacing is between a textbox and the parent widget. The hidden controls take up space in the form layout and as a result it does not look quite right. Using a individual layouts e.

Using a grid layout also looks rather horrible unless you take steps to make sure that the column widths are set appropriately. Clearly a form layout would be better but the extra unwanted spacing is a bit of a nightmare.

qt layout spacing

Obviously one could remove and re-insert items into a form layout but the bottom line is that all of these workarounds are extra work and ideally when using we should be concentrating on our application logic and not having to write code to work around bugs in Qt. I suppose one possible option not something I have properly considered would be to create a QFormLayout subclass in order to "fix" the problem.

It might be easier than some other workarounds. For now my dialog just has to live with the spacing issue, I'll have to get back to this one later!!By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I suppose I could make a subclass of every QWidget type that override paintEvent and mousePressEvent and etc to be a no-op when appropriatebut I'd prefer a solution that doesn't require me to create three dozen different QWidget subclasses.

The only decent way I know of is to attach an event filter to the widget, and filter out repaint events. It will work no matter how complex the widget is - it can have child widgets. Below is a complete stand-alone example. It comes with some caveats, though, and would need further development to make it complete. Only the paint event is overridden, thus you can still interact with the widget, you just won't see any effects.

If the widget depends on certain things being done upon an a repaint, perhaps due to an update triggered upon those events, there may be trouble. At a minimum you'd need a case statement to block more events -- say mouse move and click events. Handling focus is a concern: you'd need to move focus over to the next widget in the chain should the widget be hidden while it's focused, and whenever it'd reacquire focus. The mouse tracking poses some concerns too, you'd want to pretend that the widget lost mouse tracking if it was tracking before.

Properly emulating this would require some research, I don't know off the top of my head what is the exact mouse tracking event protocol that Qt presents to the widgets. You can use a QStackedWidget. Put your button on the first page, a blank QWidget on the second, and change the page index to make your button vanish while retaining its original space. This is a dirty solution, don't use it if you can do it other ways. I had a similar problem and I ended up putting a spacer next to my control with a size of 0 in the dimension I cared about and an Expanding sizeType.

Then I marked the control itself with an Expanding sizeType and set its stretch to 1. That way, when it's visible it takes priority over the spacer, but when it's invisible the spacer expands to fill the space normally occupied by the control.

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I suspect that will work due to Qt's QLayout example subclass documentation :. We ignore QLayoutItem::isEmpty ; this means that the layout will treat hidden widgets as visible. However, you may find that adding items to your layout is a little annoying that way.

In particular, I'm not sure you can easily specify layouts in UI files if you were to do it that way. I believe you could use a QFrame as a wrapper. Although there might be a better idea. Learn more. How to make a Qt widget invisible without changing the position of the other Qt widgets?

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qt layout spacing

Active 4 years, 3 months ago. Viewed 34k times. Jeremy Friesner Jeremy Friesner What is the Qt version? You can use QGraphicsOpacityEffect. Perhaps instead of hiding the widgets, you merely want to inactivate them? Disabling the widgets was the original functionality, but the people in charge wanted them to be invisible instead.The Grid item positions its child items so that they are aligned in a grid and are not overlapping.

The grid positioner calculates a grid of rectangular cells of sufficient size to hold all items, placing the items in the cells, from left to right and top to bottom.

Qt5 C++ Creating Layouts #5

Each item is positioned in the top-left corner of its cell with position 0, 0. A Grid defaults to four columns, and as many rows as are necessary to fit all child items. The number of rows and columns can be constrained by setting the rows and columns properties. Spacing can be added between child items by setting the spacing property. The amount of spacing applied will be the same in the horizontal and vertical directions.

Transitions can be used to animate items that are added to, moved within, or removed from a Grid item. The add and move properties can be set to the transitions that will be applied when items are added to, removed from, or re-positioned within a Grid item.

Note that the positioner assumes that the x and y positions of its children will not change. If you manually change the x or y properties in script, bind the x or y properties, use anchors on a child of a positioner, or have the width or height of a child depend on the position of a child, then the positioner may exhibit strange behaviour.

qt layout spacing

If you need to perform any of these actions, consider positioning the items without the use of a Grid. See also FlowRowColumnand Positioners example. This property holds the transition to be applied when adding an item to the positioner. The transition will only be applied to the added item s.

Positioner transitions will only affect the position x, y of items. For a positioner, adding an item can mean that either the object has been created or reparented, and thus is now a child or the positioner, or that the object has had its opacity increased from zero, and thus is now visible. If the grid does not have enough items to fill the specified number of columns, some columns will be of zero width.

When using the attached property LayoutMirroring::enabled for locale layouts, the visual layout direction of the grid positioner will be mirrored. However, the property layoutDirection will remain unchanged.

You can use the property LayoutMirroring::enabled to determine whether the direction has been mirrored. This property holds the transition to be applied when moving an item within the positioner.

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This transition can be performed when other items are added or removed from the positioner, or when items resize themselves. See also add and Positioners example.Widgets and Layouts Styles. The Qt layout system provides a simple and powerful way of automatically arranging child widgets within a widget to ensure that they make good use of the available space. Qt includes a set of layout management classes that are used to describe how widgets are laid out in an application's user interface.

These layouts automatically position and resize widgets when the amount of space available for them changes, ensuring that they are consistently arranged and that the user interface as a whole remains usable.

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All QWidget subclasses can use layouts to manage their children. The QWidget::setLayout function applies a layout to a widget. When a layout is set on a widget in this way, it takes charge of the following tasks:. The code generated for forms created using Qt Designer also uses the layout classes. Qt Designer is useful to use when experimenting with the design of a form since it avoids the compile, link and run cycle usually involved in user interface development.

They take care of geometry management for a set of widgets. To create more complex layouts, you can nest layout managers inside each other. The code for QVBoxLayout is identical, except the line where the layout is created.

The code for QGridLayout is a bit different, because we need to specify the row and column position of the child widget:. The third QPushButton spans 2 columns.

This is possible by specifying 2 as the fifth argument to QGridLayout::addWidget. When you use a layout, you do not need to pass a parent when constructing the child widgets. The layout will automatically reparent the widgets using QWidget::setParent so that they are children of the widget on which the layout is installed. Note: Widgets in a layout are children of the widget on which the layout is installed, not of the layout itself.

Widgets can only have other widgets as parent, not layouts. You can nest layouts using addLayout on a layout; the inner layout then becomes a child of the layout it is inserted into.

Layout management

Widgets are normally created without any stretch factor set.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time.

Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. 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.

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. 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.

qt layout spacing

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.

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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:. 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.