Breakpoint
Object Hierarchy:
Description:
[ Version ( since = "1.4" ) ]
public sealed class Breakpoint : Object, Buildable
Describes a breakpoint for [class@Window].
Breakpoints are used to create adaptive UI, allowing to change the layout depending on available size.
Breakpoint is a size threshold, specified by its condition, as well as one or more setters.
Each setter has a target object, a property and a value. When a breakpoint is applied, each setter sets the target property on their target object to the specified value, and reset it back to the original value when it's unapplied.
For more complicated scenarios, [signal@Breakpoint:AdwBreakpoint:apply] and [signal@Breakpoint:AdwBreakpoint:unapply]
can be used instead.
Breakpoints can be used within [class@Window], [class@ApplicationWindow] or [class@BreakpointBin].
`AdwBreakpoint` as `GtkBuildable`:
`AdwBreakpoint` supports specifying its condition via the `<condition>` element. The contents of the element must be a string in a format accepted by [func@BreakpointCondition.parse].
It also supports adding setters via the `<setter>` element. Each `<setter>` element must have the `object` attribute specifying the target object, and the `property` attribute specifying the property name. The contents of the element are used as the setter value.
For `G_TYPE_OBJECT` and `G_TYPE_BOXED` derived properties, empty contents are treated as `NULL`.
Setter values can be translated with the usual `translatable`, `context` and `comments` attributes.
Example of an `AdwBreakpoint` UI definition:
```xml <object class="AdwBreakpoint"> <condition>max-width: 400px</condition> <setter object="button" property="visible" >True</setter> <setter object="box" property="orientation">vertical</setter> <setter object="page" property="title" translatable="yes">Example</setter> </object> ```