Gtk tutorial

Follow the tutorial series by completing each tutorial part in the index that follows. Best followed in order starting with part 1. GTK relies on the GLib library. This article explains the basics of GLib and includes a simple coin toss program that uses GLib. View the GTK 3 manual offline in the Devhelp viewer. It also adds context sensitive help to Glade. Get a pointer to a widget in a callback function using Glade. Explains one method of passing user data to a callback function from within Glade.

How to group radio buttons in Glade so that they act as a unit. Clicking one radio button selects it and clears all other radio buttons in the group. Demonstrated in a simple heads or tails game. Also how to make a GTK window a fixed size and stop the user from resizing it, hide and show a widget, disable and enable a widget, nest container widgets, show a radio button group with no default selected, and change label attributes in GTK and Glade.

A GTK 3 application that displays the current time in a window. Uses a timer to update the current time. GTK widgets have a hierarchy because they have an object oriented design. Use the GtkBox container. To be continued… Stand by for regular updates with videos.Offering a complete set of UI elements, GTK is suitable for projects ranging from small one-off tools to complete application suites.

Developers around the world have used GTK as a platform to create apps that solve problems faced by end-users. Check out this easy tutorial on how to create a toolbar using Glade. GTK has all the features that a widget toolkit needs to have. These features make it the most trusted toolkit for developing Linux applications.

GTK has a comprehensive collection of core widgets like Buttons, Windows, Toolbars for use in your application.

gtk tutorial

GTK boasts of an easy to use API which helps in decreasing your development time and help you achieve better results. GTK is built on top of GLib. GLib provides the fundamental data types and system integration points to avoid duplicated code in applications. If you are interested in developing an app, get started now by developing this example application.

GTK is a large project and relies on volunteers from around the world. To help us with the project development, hack away on the existing bugs and feature requests. You can use tags like gtk or glib to narrow down the topic of discussion to specific libraries. You can also ask questions on our IRC channel. As regularly as possible, GTK team meetings take place at conferences and hackfests to discuss the future of GTK and define a roadmap.

If you are a developer and want to contribute to GTK, you are more than welcome to do so. Create interfaces that users just love Offering a complete set of UI elements, GTK is suitable for projects ranging from small one-off tools to complete application suites. Latest stable v3. Load Gtk import gi gi. GtkApplication' app. Application "com. GtkApplication"GLib. Image Viewer.

Key Sign. Password Safe. A feature-rich development tool GTK has all the features that a widget toolkit needs to have. Portability Projects built using GTK and its dependencies run on well known operating systems. Stability GTK delivers the enticing features and superb performance which adds to your applications.

Interfaces GTK has a comprehensive collection of core widgets like Buttons, Windows, Toolbars for use in your application.

gtk tutorial

Looking for Help? Meet the community As regularly as possible, GTK team meetings take place at conferences and hackfests to discuss the future of GTK and define a roadmap.If you intend to try the code in this tutorial in the interactive toplevelyou must first issue assuming you have installed lablgtk using opam :. Gtk and lablgtk are available for Unix and Windows platforms. Lablgtk makes ambitious use of advanced features of the OCaml type system.

Make sure you're familiar with labelled and optional arguments and polymorphic variants labels or you won't have any idea what's going on in this chapter. As it is, even the author of this tutorial finds ploughing through the lablgtk source code pretty hard work!

Actually, not so simple. This program has a menu with a "quit" option, and a button in the main area which you can press:. If you use findlib recommendedyou can use the following command:.

GMain provides useful functions like the Gtk main loop, so I find it a good idea to always open this module. Firstly we create the toplevel window. Every Gtk program needs at least one.

Notice three things: firstly GWindow.

Create interfaces that users just love

For various reasons which we'll discuss in the intensive section at the end of this chapter, you shouldn't create lablgtk objects using new classname arguments The helper functions are often named the same as the class which they create. You'll get used to this quickly. Thirdly see the apparently useless unit argument to GWindow.

It's actually not useless, but the only way for OCaml to tell the difference between a partial and full function application in the presence of optional arguments.

A vbox is a vertical layout widget. It's a container which contains other widgets but isn't normally visible by itself. It's just a shorthand way of writing:. In this case the destroy signal, received by the window when someone presses the "X" in the corner, will cause a call to Main.

The menubar is packed first into the vbox :. Next up we create the button and pack it in the vbox. Notice the clicked signal which is connected to an anonymous function:. Finally two lines which are essential. All Gtk widgets must be "shown" before they will appear, by calling the show method. However lablgtk, by default, automatically shows all widgets except toplevel windows. Thus we need to call window show explicitly. Gtk is event driven so everything else happens in a callback as a result of some signal received.

Read this Gtk tutorial to find out more about Gtk.The image below shows the windowed Hello World application made in this tutorial. Each time the button is clicked, the total number of button clicks is updated and displayed in the window. The tutorial demonstrates the use of a button and text label and how to get a handle or pointer to the text label in order to change its text.

See the full GTK3 tutorial index. The steps show how to create a new project from template files, design the GUI window in Glade, write the application C code and build the project. The template files include:.

Create interfaces that users just love

When the project is built the executable file name will now be named hello. Although GTK has a method of packing widgets in a window, we will use a fixed grid in this tutorial.

gtk tutorial

Users of MS Visual development tools will be familiar with placing widgets on a grid in a window. Click the fixed grid icon in the left pane of the Glade window under Containers and then click the main window to place the grid. This project uses two text labels — one to display the hello world text and a second label to display the number of times the button is clicked. Click the Label item in the left pane of Glade under the Control and Display section. Click the main window on the grid to place the label.

Size the label by changing Height request under the Common tab in the right pane of glade to In the right pane, with the label selected, click the General tab. In the left pane of Glade, click the Button icon under the Control and Display section.

Click on the main window grid to place the button. Change the height of the button to 30 in the same place that the height of the text was changed right pane, Common tab, Height request field. Place the button under the second label. Change the window title in the Title field to Hello World. When the button is clicked, it will emit a signal. We need to attach a function to the signal so that the function will be called when the button is clicked. Click the button in Glade to select it and then click the Signals tab in the right pane of the Glade editor.

Click the text under the Handler heading next to clicked to select it and then a second time to start editing it. Press the down arrow key to select it and then press the Enter key twice to make the change. Open the main. We need a pointer to each of the labels in the project so that we can get hold of the labels to change their text.

In this simple project, two global pointers are defined at the top of the C file. Finally we must add a function that writes text to the first label and increments a count in the second label when it is clicked. This function must have the same name as the signal handler function set for the button in Glade.

Open the template directory in a terminal window and build the project using the make file by entering the make command. The project can be run by either double-clicking the hello icon after navigating to the project folder using a file manager or from within the terminal window by entering:.

The Hello World window should open. This tutorial was developed on a Linux Mint It was not that complicated. Note that I choose to create a visible drag handle here instead of allowing drags to start anywhere on the row.

It looks like this:. A little gotcha here is that the widget you set up as drag source must have a GdkWindow. Lets fix that. In contrast to drags, where we created a visible drag handle to give users a hint that drag-and-drop is supported, we want to just accept drops anywhere in the list. The easiest way to do that is to just make each row a drop target i.

The entries are the same that we discussed above. Now we can start a drag on the handle, and we can drop it on some other row. But nothing happens after that. We need to do a little bit of extra work to make the reordering happen.

Lets do that next. Drag-and-drop is often used to transfer data between applications. To send and receive data, we need to connect to signals on both the source and the target side:. In our case, the function will just put a pointer to the source widget in the selection data:.

In our case, we will pull the pointer out of the selection data, and reorder the row. The only trick here is that we need to take a reference on the widget before removing it from its parent container, to prevent it from getting finalized. So far, during the drag, you just see just the cursor, which is not very helpful and not very pretty.

gtk tutorial

The expected behavior is to drag a visual representation of the row. This looks more complicated than it is — we are creating a cairo surface of the right size, render the row widget to it the signal is emitted on the handle, so we have to find the row as an ancestor. This article just shows the simplest possible setup for row reordering by drag-and-drop. Many refinements are possible, some easy and some not so easy. An obvious enhancement is to allow dragging between different lists in the same application.

Another refinement would be to drop the row before or after the target row, depending on which edge is closer. Together with this, you probably want to modify the drop target highlighing to indicate the edge where the drop will happen. This could be done in different ways, but all of them will require listening to drag-motion events and juggling event coordinates, which is not something I wanted to get into here. Finally, scrolling the list during the drag.

Implementing this may be easiest by moving the drag target to be the list widget itself, instead of the individual rows. The Inspector is extremely powerful, and allows theme designers to test CSS changes on-the-fly and magnify widgets to see even the smallest details, lets developers check the application widgets and their properties, and lets users to play and eventually break applications. Since the Inspector is a debugging tool, it is disabled by default.This is implemented in C using GObject, an object-oriented framework for C.

Widgets are organized in a hierachy.

gtk tutorial

The window widget is the main container. The user interface is then built by adding buttons, drop-down menus, input fields, and other widgets to the window.

If you are creating complex user interfaces it is recommended to use GtkBuilder and its GTK-specific markup description language, instead of assembling the interface manually. You can also use a visual user interface editor, like Glade. The toolkit listens for events such as a click on a button, and passes the event to your application. To begin our introduction to GTK, we'll start with a simple signal-based Gtk application.

[ GTK-RS ] Prototyping a GTK app with Rust

The compiler will abort with an error if any other header is directly included. For this example org. Next the activate signal is connected to the activate function above the main functions. The parsed arguments will be removed from the array, leaving the unrecognized ones for your application to parse. Inside the activate function we want to construct our GTK window, so that a window is shown when the application is launched.

The window will have a frame, a title bar, and window controls depending on the platform. More information about this convention can be found here. Finally the status integer is returned and the GTK application exits. These are typically input events caused by the user interacting with your program, but also things like messages from the window manager or other applications. Connecting handlers for these signals is how you normally make your program do something in response to user input.

In the long tradition of programming languages and libraries, it is called Hello, World. As seen above, example The buttons which this box will contain can either be stored horizontally or vertically but this does not matter in this particular case as we are dealing with only one button. Next the button variable is initialized in similar manner. This has the effect that when the button is clicked, the whole GTK window is destroyed. More information about creating buttons can be found here.

The rest of the code in example Go to page content Go to main menu Go to the search field. About Users Administrators Developers.Prior to working through this tutorial, it is recommended that you have a reasonable grasp of the Python programming language. It is necessary for you to know how to create and run Python files, understand basic interpreter errors, and work with strings, integers, floats and Boolean values.

For the more advanced widgets in this tutorial, good knowledge of lists and tuples will be needed. Installation 2. Getting Started 3.

GTK Glade C Programming Tutorial

Basics 4. How to Deal With Strings 5. Widget Gallery 6. Layout Containers 7. Label 8. Entry 9. Button Widgets ProgressBar Spinner Tree and List Widgets CellRenderers ComboBox IconView Multiline Text Editor Dialogs Popovers Clipboard Drag and Drop Glade and Gtk. Builder


comments

Leave a Reply

Your email address will not be published. Required fields are marked *