add label truncate property

src/widgets/label.ts

@@ -1,7 +1,9 @@
 import GObject from 'gi://GObject';
 import Gtk from 'gi://Gtk?version=3.0';
+import Pango from 'gi://Pango';
 
 const justification = ['left', 'center', 'right', 'fill'];
+const truncate = ['none', 'start', 'middle', 'end'];
 
 export default class AgsLabel extends Gtk.Label {
     static {
@@ -13,6 +15,11 @@ export default class AgsLabel extends Gtk.Label {
                     GObject.ParamFlags.READWRITE | GObject.ParamFlags.CONSTRUCT,
                     '',
                 ),
+                'truncate': GObject.ParamSpec.string(
+                    'truncate', 'Truncate', 'Truncate',
+                    GObject.ParamFlags.READWRITE | GObject.ParamFlags.CONSTRUCT,
+                    '',
+                ),
             },
         }, this);
     }
@@ -21,8 +28,22 @@ export default class AgsLabel extends Gtk.Label {
         super(typeof params === 'string' ? { label: params } : params);
     }
 
+    get truncate() { return truncate[this.ellipsize]; }
+    set truncate(truncate: string) {
+        if (!truncate)
+            return;
+
+        if (!truncate.includes(truncate)) {
+            console.error('wrong truncate value for Label');
+            return;
+        }
+
+        // @ts-ignore
+        this.ellipsize = Pango.EllipsizeMode[truncate.toUpperCase()];
+    }
+
     get justification() { return justification[this.justify]; }
-    set justification(justify) {
+    set justification(justify: string) {
         if (!justify)
             return;