Introduce view_switcher, header_bar, bin UI macros

src/ui/utility.rs

@@ -102,14 +102,33 @@ macro_rules ! flow_box { (
 	widget
 } } }
 
+macro_rules ! view_switcher { (
+	$ ( @ policy : $ policy : expr , ) ?
+	$ stack : expr $ (,) ?
+) => { {
+	let widget = libadwaita :: ViewSwitcher :: new () ;
+	$ ( widget . set_policy ( $ policy ) ; ) ?
+	widget . set_stack ( Some ( & $ stack ) ) ;
+	widget
+} } }
+
+macro_rules ! header_bar { ( $ title_widget : expr $ (,) ? ) => { {
+	let widget = libadwaita :: HeaderBar :: new () ;
+	widget . set_title_widget ( Some ( & $ title_widget ) ) ;
+	widget
+} } }
+
+macro_rules ! bin { ( $ ( @ vexpand : $ vexpand : expr ) ? $ (,) ? ) => { {
+	let widget = libadwaita :: Bin :: new () ;
+	$ ( widget . set_vexpand ( $ vexpand ) ; ) ?
+	widget
+} } }
+
 macro_rules ! vertically_filling { ( $ child : expr ) => {
 	g_box ! (
 		@ orientation : gtk4 :: Orientation :: Vertical ,
 		$ child ,
-		libadwaita :: Bin :: builder ()
-			. css_name ("filler")
-			. vexpand (true)
-			. build () ,
+		bin ! ( @ vexpand : true ) ,
 	)
 } }
 
@@ -125,5 +144,8 @@ pub (crate) use {
 	icon ,
 	scrolled_window ,
 	flow_box ,
+	view_switcher ,
+	header_bar ,
+	bin ,
 	vertically_filling ,
 } ;