Qt default background color

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Qt default background color

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Good luck creating great Qt software in ! I hope this one is appealing to answer. Well, at least I tried So, most Qt applications have QWidget as their parent, right? But I'm now looking at the rasterwindow example code. I've read somewhere in Qt assistant that because the widgets stuff is not used here this can be a little more efficient. But these applications do not obey the default Windows background colors.

So what is the most straightforward way to implement that? I'm using Qt 5. I currently have something that works but I'm aiming for you to beat me in straightforwardness. So I've used the standard windows API to get that:. I don't understand why that byte order is reversed from GetSysColor function that would make that byte swap function necessary.

So, no matter how deep my ego is crushed if you can provide something better I'm a happy guy. Something like getting rid of that QRect and set a background on the QWindow itself? A few words on how it works underneath: on Windows to show a window you first need to register a window class with RegisterClass or RegisterlClassEx and then create an instance of that class with CreateWindow or CreateWindowEx.

To register a window you need to pass a struct that describes that window and one of the fields in that struct is the brush HBRUSH that is used by Windows to erase the background of the window when it needs to repaint. Passing NULL here means the system doesn't erase the background and any drawing is done solely by the app in its paint message handler. In the raster window example the painter draws a white rect, so it covers entire window.Stylesheets add spicy flavor to your boring Qt GUIs.

Inspired by the web, stylesheets are a great way to stylize your Qt GUI, but it seems that few people use them. This tutorial assumes that you can get around in Qt Designer, and that you understand a little about Qt layouts.

Step 2 Add a QFrame to your form, and apply a vertical layout to your form any layout will work actually: vertical, horizontal or grid. Give your form about 30 pixels of layout margin around its perimeter.

This is where we specify the style sheet for our form. Since stylesheets cascade down to the child widgets, you can stylize any widget in your form from this point. Or you may have mistyped something into the CSS dialog. One cool feature is that you get to preview the style changes right as you make them.

Let me explain what we just did. In our example, MyLoginForm identifies the parent widget i. All we did there is give it a gray background with background: gray.

For mainFramewe gave it a thick gray border, a white background, and rounded corners. Then give your layout some margin. I used 50 pixels of margin and 15 pixels for both vertical and horizontal spacing.

Add this to the style sheet for MyLoginForm:.

qt default background color

For example, you can change the border style of just a single side of a QFrame. This would be immensely useful. The dialog we just designed will look exactly the same on Linux, Windows, and Mac OS X because we stylized it so aggressively. If you want your widgets to look native on each platform, you should generally use style sheets sparingly, but if your goal is to have a consistent look across all platforms, style sheets are your best friend.

Now that I have discovered the power of style sheets in Qt, I use them whenever possible. What cool things have you done with Qt style sheets? Great tip, I was going nuts trying to figure out how to set a background image on a QDialog that did not affect all the child widgets. This did the trick and inspired further tinkering. Thanks for this really helped alot. I am trying to use see if I can use methods that are available to both types.

Your patch to import css files into designer sounds great!A palette consists of three color groups: ActiveDisabledand Inactive. All widgets in Qt contain a palette and use their palette to draw themselves. This makes the user interface easily configurable and easier to keep consistent. If you create a new widget we strongly recommend that you use the colors in the palette rather than hard-coding specific colors. Both active and inactive windows can contain disabled widgets.

Disabled widgets are often called inaccessible or grayed out. Colors and brushes can be set for particular roles in any of a palette's color groups with setColor and setBrush. A color group contains a group of colors used by widgets for drawing themselves. We recommend that widgets use color group roles from the palette such as "foreground" and "base" rather than literal colors like "red" or "turquoise".

The color roles are enumerated and defined in the ColorRole documentation. We strongly recommend that you use the default palette of the current style returned by QGuiApplication::palette and modify that as necessary. This is done by Qt's widgets when they are drawn. To modify a color group you call the functions setColor and setBrushdepending on whether you want a pure color or a pixmap pattern. There are also corresponding color and brush getters, and a commonly used convenience function to get the ColorRole for the current ColorGroup : windowwindowTextbaseetc.

You can copy a palette using the copy constructor and test to see if two palettes are identical using isCopyOf. QPalette is optimized by the use of implicit sharingso it is very efficient to pass QPalette objects as arguments. Warning: Some styles do not use the palette for all drawing, for instance, if they make use of native theme engines.

This is the case for both the Windows Vista and the macOS styles. There are some color roles used mostly for 3D bevel and shadow effects.

All of these are normally derived from Windowand used in ways that depend on that relationship. For example, buttons depend on it to make the bevels look attractive, and Motif scroll bars depend on Mid to be slightly different from Window.

For example:. Move-constructs a QPalette instance, making it point at the same object that other was pointing to. After being moved from, you can only assign to or destroy other. Any other operation will result in undefined behavior. Constructs a palette.

qt default background color

Constructs a palette from a button color and a window. The other colors are automatically calculated, based on these colors. Constructs a palette from the button color. The other colors are automatically calculated, based on this color. Window will be the button color as well. See also ColorRole and brush. See also colorsetBrushand ColorRole. Returns the brush that has been set for the given color role in the current ColorGroup.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. There is a page titled " How to change the background color of QWidget " but it just talks about those two methods. There is also a page " Qt Style Sheets Examples " that implies that if you want to change the background color, you have to take over all aspects of drawing the button, which just seems like overkill.

I need this to run on Mac, Windows, and Ubuntu Linux, and it's really not a happy thing if I have to manually draw everything about the button 3 times once for each platform. By "background color" I mean the area surrounding the button, not the color under the text on the face of the button.

Try these commands in the exact order as above, and if that still doesn't work, set your theme to Fusion and try again. I found a stupid way, tried every attribute in palette, and it works for me when changing 'QPalette::Base'. Maybe you can have a try. Learn more. Asked 6 years, 2 months ago. Active 2 days ago. Viewed 63k times. Am I missing something obvious? Betty Crokker Betty Crokker 2, 4 4 gold badges 21 21 silver badges 43 43 bronze badges.

How to Change the Background Color of QWidget/fa

Did you ever solve this? I did not You might be able to create your own QStyle-derived class and somehow piggyback on the QStyle itself, but we decided to just go a completely different direction with our UI, bypassing this limitation. Active Oldest Votes. I had the same issue, but finally got this to work.The QChart class manages the graphical representation of the chart's series, legends, and axes.

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It manages the graphical representation of different types of series and other chart related objects like legend and axes. In addition, line, spline, area, and scatter series can be presented as polar charts by using the QPolarChart class. It stores an OR combination of AnimationOption values.

A theme is a built-in collection of UI style related settings applied to all the visual elements of a chart, such as colors, pens, brushes, and fonts of series, as well as axes, title, and legend.

The Chart themes example illustrates how to use themes. Note: Changing the theme will overwrite all customizations previously applied to the series.

If set to truethe background drop shadow effect is enabled. If set to falseit is disabled. Note: The drop shadow effect depends on the theme, and therefore the setting may change if the theme is changed. Labels are localized only when localizeNumbers is trueexcept for QDateTimeAxis labels, which always use the QLocale set with this property. When trueall generated numbers appearing in various series and axis labels will be localized using the QLocale set with the locale property.

When falsethe C locale is always used. Defaults to false. This property holds the minimum margins allowed between the edge of the chart rectangle and the plot area. The plot area does not include the area defined by margins. By default this will resize if inside a QChartView. If an explicit size is set for the plot area then it will respect this, to revert back to the default behavior, then calling setPlotArea QRectF ; will achieve this. Note: By default, the plot area background is invisible and the plot area uses the general chart background.

Constructs a chart object that is a child of parent. The properties specified by wFlags are passed to the QGraphicsWidget constructor. Adds the axis axis to the chart aligned as specified by alignment. The chart takes the ownership of the axis.

How to Change the Background Color - Illustrator Tutorial

Note: A newly added series is not attached to any axes by default, not even those that might have been created for the chart using createDefaultAxes before the series was added to the chart.Qt Style Sheets Reference.

Let's start by setting yellow as the background color of all QLineEdit s in an application. This could be achieved like this:. If we want the property to apply only to the QLineEdit s that are children or grandchildren or grand-grandchildren of a specific dialog, we would rather do this:.

Alternatively, we can set the background-color property directly on the QLineEditomitting the selector:. There are many situations where we need to present a form that has mandatory fields. To indicate to the user that the field is mandatory, one effective albeit esthetically dubious solution is to use yellow as the background color for those fields. It turns out this is very easy to implement using Qt Style Sheets. First, we would use the following application-wide style sheet:.

This means that every widget whose mandatoryField Qt property is set to true would have a yellow background. Then, for each mandatory field widget, we would simply create a mandatoryField property on the fly and set it to true.

For example:. This time, we will show how to create a red QPushButton. This QPushButton would presumably be connected to a very destructive piece of code. Things look already a lot better. But the button looks a bit cramped. Let's specify some spacing between the border and the text using the padding.

Setting the Dialog Box’s Background Color

Additionally, we will enforce a minimum width, round the corners, and specify a larger font to make the button look nicer:. The only issue remaining is that the button doesn't react when we press it. We can fix this by specifying a slightly different background color and use a different border style. Subcontrols give access to the sub-elements of a widget.

Let's customize the menu indicator for the red push button:. By default, the menu indicator is located at the bottom-right corner of the padding rectangle. We can change this by specifying subcontrol-position and subcontrol-origin to anchor the indicator differently. We can also use top and left to move the indicator by a few pixels.

This positions the myindicator. Since red seems to be our favorite color, let's make the text in QLineEdit red by setting the following application-wide stylesheet:. However, we would like to give a visual indication that a QLineEdit is read-only by making it appear gray:. At some point, our design team comes with the requirement that all QLineEdit s in the registration form with the object name registrationDialog to be brown:. For example, to set a background-image that scrolls with the scroll bar:.

The main difference is that a tristate QCheckBox has an indeterminate state.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. Does anyone know how one would be able to set a background color for the whole window of a Qt application?

Basically, if I want a black background how would I make it seamless without any borders of the original background? EDIT : according to comment, here is a solution without using ui files and loading an external style sheet. For the widgets I suggest you to see In Qt, how do I set the background color of a widget like combobox or double spin box?

qt default background color

Also check Custom Looks using Qt 4. Remember that this second link shows you how to use the stylesheets in these widgets. This is a variant of Dirk Eddelbuettel's solution but makes use of the function specifically for the background.

Learn more. How do I set a background color for the whole window of a Qt application? Ask Question. Asked 10 years, 5 months ago. Active 2 years, 7 months ago. Viewed 71k times. Active Oldest Votes. I would simply use a Style Sheet for the whole window. How do I do this in a stylesheet? I've done this for widgets like the QPushButton but cannot figure out what to use for the background as a whole.

Let me clarify on a few things too. I am not using a. Also, I have a separate stylesheet. Thanks, I knew it was right under my nose. I didn't realized I could directly use QWidget. Dirk Eddelbuettel Dirk Eddelbuettel k 46 46 gold badges silver badges bronze badges.

It has been my experience that for most palette roles, you don't even need to get the original palette. Setting just one role on a default constructed palette, and setting that palette for the widget, will only change the role you specified.

It's what I had to do when setting a default background color for a widget this way. Simply just add setStyleSheet "background-color: white;" ; to your code, you can give any color directly. Neji 5, 3 3 gold badges 37 37 silver badges 61 61 bronze badges. If you have already developed something for Web and used CSS, it's the same thing.


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