Package ch.bailu.gtk.adw

Klasse BreakpointBin

java.lang.Object
ch.bailu.gtk.type.Type
ch.bailu.gtk.type.Pointer
ch.bailu.gtk.gobject.Object
ch.bailu.gtk.type.PropertyHolder
ch.bailu.gtk.gobject.InitiallyUnowned
ch.bailu.gtk.gtk.Widget
ch.bailu.gtk.adw.BreakpointBin
Alle implementierten Schnittstellen:
PointerInterface
public class BreakpointBin extends Widget
A widget that changes layout based on available size.

<picture>
<source srcset="breakpoint-bin-dark.png" media="(prefers-color-scheme: dark)">
<img src="breakpoint-bin.png" alt="breakpoint-bin">
</picture>

`AdwBreakpointBin` provides a way to use breakpoints without [class@Window],
[class@ApplicationWindow] or [class@Dialog]. It can be useful for limiting
breakpoints to a single page and similar purposes. Most applications
shouldn't need it.

`AdwBreakpointBin` is similar to [class@Bin]. It has one child, set via the
[property@BreakpointBin:child] property.

When `AdwBreakpointBin` is resized, its child widget can rearrange its layout
at specific thresholds.

The thresholds and layout changes are defined via [class@Breakpoint] objects.
They can be added using [method@BreakpointBin.add_breakpoint].

Each breakpoint has a condition, specifying the bin's size and/or aspect
ratio, and setters that automatically set object properties when that
happens. The [signal@Breakpoint::apply] and [signal@Breakpoint::unapply] can
be used instead for more complex scenarios.

Breakpoints are only allowed to modify widgets inside the `AdwBreakpointBin`,
but not on the `AdwBreakpointBin` itself or any other widgets.

If multiple breakpoints can be used for the current size, the last one is
always picked. The current breakpoint can be tracked using the
[property@BreakpointBin:current-breakpoint] property.

If none of the breakpoints can be used, that property will be set to `NULL`,
and the original property values will be used instead.

## Minimum Size

Adding a breakpoint to `AdwBreakpointBin` will result in it having no minimum
size. The [property@Gtk.Widget:width-request] and
[property@Gtk.Widget:height-request] properties must always be set when using
breakpoints, indicating the smallest size you want to support.

The minimum size and breakpoint conditions must be carefully selected so that
the child widget completely fits. If it doesn't, it will overflow and a
warning message will be printed.

When choosing minimum size, consider translations and text scale factor
changes. Make sure to leave enough space for text labels, and enable
ellipsizing or wrapping if they might not fit.

For [class@Gtk.Label] this can be done via [property@Gtk.Label:ellipsize], or
via [property@Gtk.Label:wrap] together with [property@Gtk.Label:wrap-mode].

For buttons, use [property@Gtk.Button:can-shrink],
[property@Gtk.MenuButton:can-shrink], [property@Adw.SplitButton:can-shrink],
or [property@Adw.ButtonContent:can-shrink].

## Example

```c
GtkWidget *bin, *child;
AdwBreakpoint *breakpoint;

bin = adw_breakpoint_bin_new ();
gtk_widget_set_size_request (bin, 150, 150);

child = gtk_label_new ("Wide");
gtk_label_set_ellipsize (GTK_LABEL (label), PANGO_ELLIPSIZE_END);
gtk_widget_add_css_class (child, "title-1");
adw_breakpoint_bin_set_child (ADW_BREAKPOINT_BIN (bin), child);

breakpoint = adw_breakpoint_new (adw_breakpoint_condition_parse ("max-width: 200px"));
adw_breakpoint_add_setters (breakpoint,
G_OBJECT (child), "label", "Narrow",
NULL);
adw_breakpoint_bin_add_breakpoint (ADW_BREAKPOINT_BIN (bin), breakpoint);
```

The bin has a single label inside it, displaying "Wide". When the bin's width
is smaller than or equal to 200px, it changes to "Narrow".

## `AdwBreakpointBin` as `GtkBuildable`

`AdwBreakpointBin` allows adding `AdwBreakpoint` objects as children.

Example of an `AdwBreakpointBin` UI definition:

```xml
<object class="AdwBreakpointBin">
<property name="width-request">150</property>
<property name="height-request">150</property>
<property name="child">
<object class="GtkLabel" id="child">
<property name="label">Wide</property>
<property name="ellipsize">end</property>
<style>
<class name="title-1"/>
</style>
</object>
</property>
<child>
<object class="AdwBreakpoint">
<condition>max-width: 200px</condition>
<setter object="child" property="label">Narrow</setter>
</object>
</child>
</object>
```

See [class@Breakpoint] documentation for details.

https://gnome.pages.gitlab.gnome.org/libadwaita/doc/main/class.BreakpointBin.html

  • Konstruktordetails

    • BreakpointBin

      public BreakpointBin(PointerContainer pointer)

    • BreakpointBin

      public BreakpointBin()
      Creates a new `AdwBreakpointBin`.

  • Methodendetails

    • getClassHandler

      public static ClassHandler getClassHandler()

    • addBreakpoint

      public void addBreakpoint(@Nonnull Breakpoint breakpoint)
      Adds @breakpoint to @self.
      Parameter:
      breakpoint - the breakpoint to add

    • getChild

      public Widget getChild()
      Gets the child widget of @self.
      Gibt zurück:
      the child widget of @self

    • getCurrentBreakpoint

      public Breakpoint getCurrentBreakpoint()
      Gets the current breakpoint.
      Gibt zurück:
      the current breakpoint

    • removeBreakpoint

      public void removeBreakpoint(@Nonnull Breakpoint breakpoint)
      Removes @breakpoint from @self.
      Parameter:
      breakpoint - a breakpoint to remove

    • setChild

      public void setChild(@Nullable Widget child)
      Sets the child widget of @self.
      Parameter:
      child - the child widget

    • asAccessible

      public Accessible asAccessible()
      Implements interface Accessible. Call this to get access to interface functions.
      Setzt außer Kraft:
      asAccessible in Klasse Widget
      Gibt zurück:
      Accessible

    • asBuildable

      public Buildable asBuildable()
      Implements interface Buildable. Call this to get access to interface functions.
      Setzt außer Kraft:
      asBuildable in Klasse Widget
      Gibt zurück:
      Buildable

    • asConstraintTarget

      public ConstraintTarget asConstraintTarget()
      Implements interface ConstraintTarget. Call this to get access to interface functions.
      Setzt außer Kraft:
      asConstraintTarget in Klasse Widget
      Gibt zurück:
      ConstraintTarget

    • getTypeID

      public static long getTypeID()

    • getParentTypeID

      public static long getParentTypeID()

    • getTypeSize

      public static TypeSystem.TypeSize getTypeSize()

    • getParentTypeSize

      public static TypeSystem.TypeSize getParentTypeSize()

    • getInstanceSize

      public static int getInstanceSize()