Button

Basics

You can create a simple button :

JavaKotlinBlueprintXML

final var button = Button.withLabel("Hello world!");

val button = Button.withLabel("Hello world!");

Button {
  label: "Hello world!";
}

<object class="GtkButton">
  <property name="label">Hello world!</property>
</object>

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The main interaction with a button is clicking it. You handle this interaction by hooking to the clicked event :

JavaKotlin

button.onClicked(() -> {
    System.out.println("Hello world!");
});

button.onClicked {
    println("Hello world!")
}

You can create a button with just an icon :

JavaKotlinBlueprintXML

button.setIconName("list-add-symbolic");

button.iconName = "list-add-symbolic";

Button {
  icon-name: "list-add-symbolic"
}

<object class="GtkButton">
  <property name="icon-name">list-add-symbolic</property>
</object>

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Icons

Refer to this page regarding available icons.

There are several libAdwaita CSS classes enabling button styling.

Add a CSS class to a widget

JavaKotlinBlueprintXML

button.setCssClasses(new String[]{ "flat" });

button.cssClasses = arrayOf("flat")

Button {
  label: "Hello world!";
  styles [
    "flat"
  ]
}

<object class="GtkButton">
  <style>
    <class name="flat"/>
  </style>
</object>