Imageviewer gtk4/20/2023 Gtk_widget_show_all() to show the window and all the widgets it contains. The last g_signal_connect() makes sure that the application exits when the window is closed.Īs a last step, make sure to replace the gtk_widget_show call in the main() function by We will define the callback in the next section. To pass the image as an additional argument to that function. This is done using the g_signal_connectįunction which tells GTK to call the on_image_open function when the button is clicked and When the button is clicked, it fires the clicked signal, which we can connect to some action. We need to define what happens when the user clicks on the button. In GTK this is usually not needed as it makes it much easier to have a layout that You will notice that we don't setĮxplicit sizes on the widgets. The image willĮxpand into any available space while the button will just be as big as needed. The calls to gtk_box_pack_start add the two widgets to the box and define their behaviour. Which is needed as C doesn't support object-orientation out-of-the-box. The macros like GTK_BOX are used for dynamic type checking and casting The first lines create the widgets we want to use: a button for opening up an image, the image view widget itself and You only need to do this once, for the first build. Press Execute on the next window that appears to configure a debug build. This code is ready to be used, so you can compile it by clicking Build ⸠Build Project (or press Shift+ F7). These functions specify how translation tools should handle your app when you run them. The ENABLE_NLS conditional definition sets up gettext, which is a framework for translating applications. The gtk_main function starts the GTK main loop, which runs the user interface and starts listening for events (like clicks and key presses). It calls a few functions which set up and then run the application. The main function is run by default when you start a C application. Here, the destroy function is called (and quits the app) when you close the window. The create_window function creates a new (empty) window and connects a signal to exit the application when that window is closed.Ĭonnecting signals is how you define what happens when you push a button, or when some other event happens. Functions from these libraries are used in the rest of the code. The three #include lines at the top include the config (useful autoconf build defines), gtk (user interface) and gi18n (internationalization) libraries.
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