Qt designer add custom widget

Qt Designer 's plugin-based architecture allows user-defined and third party custom widgets to be edited just like you do with standard Qt widgets. All of the custom widget's features are made available to Qt Designerincluding widget properties, signals, and slots.

Since Qt Designer uses real widgets during the form design process, custom widgets will appear the same as they do when previewed. The QtDesigner module provides you with the ability to create custom widgets in Qt Designer. To integrate a custom widget with Qt Designeryou require a suitable description for the widget and an appropriate.

To inform Qt Designer about the type of widget you want to provide, create a subclass of QDesignerCustomWidgetInterface that describes the various properties your widget exposes. Most of these are supplied by functions that are pure virtual in the base class, because only the author of the plugin can provide this information. Note: createWidget is a factory function responsible for creating the widget only.

The custom widget's properties will not be available until load returns. The domXml function returns a UI file snippet that is used by Qt Designer 's widget factory to create a custom widget and its applicable properties. Since Qt 4. If the custom widget does not provide a reasonable size hint, it is necessary to specify a default geometry in the string returned by the domXml function in your subclass. For example, the AnalogClockPlugin provided by the Custom Widget Plugin example, defines a default widgetgeometry in the following way:.

An additional feature of the domXml function is that, if it returns an empty string, the widget will not be installed in Qt Designer 's widget box. However, it can still be used by other widgets in the form.

qt designer add custom widget

This feature is used to hide widgets that should not be explicitly created by the user, but are required by other widgets. This applies to container widgets that require calling a particular method to add a child rather than adding the child by passing the parent.

In particular, this is relevant for containers that are not a a subclass of the containers provided in Qt Designerbut are based on the notion of Current Page. In addition, you need to provide a container extension for them. The property name is given in the attribute name and the element text is the tooltip.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. So i created a class which inherits from Qt's QWidget. It worked to place it on a QMainWindow programaticaly, but have to do my work in the desiger where it does not appear as an option in the kist of components.

I tried to follow it but doesn't work. Does someone know an other way to do this or can give a hint where i can search for problems following this tutorial? There is a different example in the examples section of the Qt documentation that I think is a lot clearer. Custom Widget Plugin Example. If you are like me, the analog clock example didn't do it for you, in which case I found just one better tutorial.

qt designer add custom widget

It may be on the kde site but I you dont need kde to do it, it just explains how to make the custom widget a plugin so you can add it into Qt Designer, rather than having to code it in, which is the norm when you just add a widget to your project and customize the class. I hope this page helps you like it helped me, get in the right direction of writing a single Qt Designer or multiple plugin:.

Writing Qt Designer Plugins. If this link ever becomes dead, just do a search for the link itself, usually that will turn up the original page in someone's cache, as they do in the other examples above the dead links in the above answers that just take you to main area and not to the pages originally intended.

How are we doing? Please help us improve Stack Overflow. Take our short survey. Learn more. How to use custom widget in Qt-Designer Ask Question. Asked 8 years, 3 months ago. Active 3 days ago. Viewed 5k times. Thanks in advance. Vaidotas Strazdas 2 2 silver badges 12 12 bronze badges.

Active Oldest Votes. Michael Wales Michael Wales 91 2 2 bronze badges. I hope this page helps you like it helped me, get in the right direction of writing a single Qt Designer or multiple plugin: Writing Qt Designer Plugins If this link ever becomes dead, just do a search for the link itself, usually that will turn up the original page in someone's cache, as they do in the other examples above the dead links in the above answers that just take you to main area and not to the pages originally intended.

Mathlight 5, 12 12 gold badges 52 52 silver badges 98 98 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook.

Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast Cryptocurrency-Based Life Forms. Q2 Community Roadmap. Featured on Meta. Community and Moderator guidelines for escalating issues via new response…. Feedback on Q2 Community Roadmap.In this example, the custom widget used is based on the Analog Clock exampleand does not provide any custom signals or slots. To provide a custom widget that can be used with Qt Designerwe need to supply a self-contained implementation and provide a plugin interface.

In this example, we reuse the Analog Clock example for convenience. Since custom widgets plugins rely on components supplied with Qt Designerthe project file that we use needs to contain information about Qt Designer 's library components:. The QT variable contains the keyword uiplugin.

qt designer add custom widget

It does not have a dependency on the Qt Designer libraries. Plugins accessing other interfaces of Qt Designer to implement container extensions or other Qt Designer specific functionality follow different rules and are covered by other examples.

The header and source files for the widget are declared in the usual way, and we provide an implementation of the plugin interface so that Qt Designer can use the custom widget:. It is also important to ensure that the plugin is installed in a location that is searched by Qt Designer. We do this by specifying a target path for the project and adding it to the list of items to install:. The custom widget is created as a library, and will be installed alongside the other Qt Designer plugins when the project is installed using make install or an equivalent installation procedure.

For more information about plugins, see the How to Create Qt Plugins documentation. The AnalogClock class is defined and implemented in exactly the same way as described in the Analog Clock example. Since the class is self-contained, and does not require any external configuration, it can be used without modification as a custom widget in Qt Designer. The functions provide information about the widget that Qt Designer can use in the widget box. The initialized private member variable is used to record whether the plugin has been initialized by Qt Designer.

Note that the only part of the class definition that is specific to this particular custom widget is the class name. The class constructor simply calls the QObject base class constructor and sets the initialized variable to false.

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Qt Designer will initialize the plugin when it is required by calling the initialize function:. In this example, the initialized private variable is tested, and only set to true if the plugin is not already initialized. Although, this plugin does not require any special code to be executed when it is initialized, we could include such code after the test for initialization.

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The isInitialized function lets Qt Designer know whether the plugin is ready for use:. Instances of the custom widget are supplied by the createWidget function. The implementation for the analog clock is straightforward:. In this case, the custom widget only requires a parent to be specified.The application user interface is constructed from Qt widgets by using Qt Designer.

Note: The Header fileSource file and Form file fields are automatically updated to match the name of the class.

Note: The project opens in the Edit mode, and these instructions are hidden.

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To return to these instructions, open the Help mode. Begin by designing the user interface and then move on to filling in the missing code. Finally, add the find functionality. Note: To easily locate the widgets, use the search box at the top of the Sidebar. For example, to find the Label widget, start typing the word label. Applying the horizontal and vertical layouts ensures that the application UI scales to different screen sizes.

The textfinder. You need to add a private function, loadTextFileto read and display the contents of the input text file in the QTextEdit. You need a resource file. The input file can be any. Create a text file called input. Now that you have all the necessary files, click the button to compile and run your program.

Documentation contributions included herein are the copyrights of their respective owners. All other trademarks are property of their respective owners. The Introduction and Project Location dialog opens.

In the Name field, type TextFinder. In the Create in field, enter the path for the project files. The Kit Selection dialog opens. Select build and run kits for your project, and click Next or Continue.

The Class Information dialog opens. In the Class name field, type TextFinder as the class name. In the Base class list, select QWidget as the base class type.This blog post will describe how to write a custom Qt widget and how to integrate it into Qt Designer so that you can drag and drop it onto your designs.

It will also provide an understanding of important differences between Qt 4 and Qt 5 when it comes to creating designable widgets.

It is designed to be a realistic representation of the real thing:. On line 4, we include the Qt Designer header file.

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This pulls in everything needed to make the widget designable. On line 9, we declare the LED class. It inherits from QWidget. On some platforms, it evaluates to empty. Properties are an important feature of the Qt meta-object system. A property is a value that can be read and optionally written. More importantly for our purposes, properties are exposed in the Qt Designer property editor. Lines 13 to 18 specify six properties of the LED widget. The first parameter is the data type and the second is the property name.

Additional parameters are described in the Qt documentation. Notice that setState, setFlashing, and setFlashRate are marked as slots lines 40, 42, and This allows a programmer to connect signals from other widgets to the LED slots to control it. The other slots are variations on the setState and setFlashing setters. It is important for a widget to behave properly when managed by one of Qt's layout managers in terms of size and location.

The virtual method sizeHint line 49 below should be overridden by your custom widget to give Qt's layout objects a clue about how to size the widget. The heightForWidth method line 48 returns the preferred height for the widget given the width. The minimumSizeHint method returns the recommended minimum size for your widget. This is where all the painting happens whenever the widget is shown either initially or because an overlying window has moved away or updated for instance, by one of the property setters.

Let's look at the implementation of LED now. The "getter" a. For instance:. The call results in a QPaintEvent object being put on the Qt event queue.

If we didn't call update the state change would not be evident immediately. We would next see it if we caused the LED widget to be hidden and then exposed again.

We want to see changes immediately though, so we call update.Qt Designer can display custom widgets through its extensible plugin mechanism, allowing the range of designable widgets to be extended by the user and third parties. This feature also allows Qt Designer to optionally support Qt 3 compatibility widgets.

Alternatively, it is possible to use existing widgets as placeholders for widget classes that provide similar APIs. Widgets from the Qt3Support library are made available via in Qt Designer 's support for custom widgets.

Although Qt Designer supports all of the standard Qt widgets, and can be configured to handle widgets supplied in the Qt3Support library, some specialized widgets may not be available as standard for a number of reasons:.

In the above situations, it is still possible to design forms with the aim of using custom widgets in the application. To achieve this, we can use the widget promotion feature of Qt Designer. In all other cases, where the source code to the custom widgets is available, we can adapt the custom widget for use with Qt Designer. If some forms must be designed, but certain custom widgets are unavailble to the designer, we can substitute similar widgets to represent the missing widgets. For example, we might represent instances of a custom push button class, MyPushButtonwith instances of QPushButton and promote these to MyPushButton so that uic generates suitable code for this missing class.

When choosing a widget to use as a placeholder, it is useful to compare the API of the missing widget with those of standard Qt widgets. For specialized widgets that subclass standard classes, the obvious choice of placeholder is the base class of the custom widget; for example, QSlider might be used for specialized QSlider subclasses.

For specialized widgets that do not share a common API with standard Qt widgets, it is worth considering adapting a custom widget for use in Qt Designer. If this is not possible then QWidget is the obvious choice for a placeholder widget since it is the lowest common denominator for all widgets.

Embedding custom widgets from Qt Designer

To add a placeholder, select an object of a suitable base class and choose Promote to After entering the class name and header file in the lower part of the dialog, choose Add. The placeholder class will now appear along with the base class in the upper list. Click the Promote button to accept this choice. Now, when the form's context menu is opened over objects of the base class, the placeholder class will appear in the Promote to submenu, allowing for convenient promotion of objects to that class.

A promoted widget can be reverted to its base class by choosing Demote to from the form's context menu. Custom widgets can be adapted for use with Qt Designergiving designers the opportunity to configure the user interface using the actual widgets that will be used in an application rather than placeholder widgets. The process of creating a custom widget plugin is described in the Creating Custom Widgets for Qt Designer chapter of this manual.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. The amount of tutorials, how to create a qt designer plugin is very thin.

Where i have to add some qt definitions in the. I use CMake and Visual Studio for coding, so it would be really awesome if someone could tell me how i successfully create a. Disclaimer: I know this is an old question but Even now I didn't find complete resources on how to do it. I can't answer you for the Visual Studio part since I build on the windows command line, but here is my cmake.

Then in the other CMakeLists. So I included again the files I wanted :. Just use the cmake's qt auto tools and add all sources. Learn more. Asked 6 years, 11 months ago. Active 3 years, 2 months ago. Viewed 3k times. Amazonasmann Amazonasmann 1 1 gold badge 9 9 silver badges 24 24 bronze badges.

Active Oldest Votes. I assume you have already created the following files related to the plugin, i. The CMakeLists. This clearly needs to get fixed. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown.

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qt designer add custom widget

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