Porting Level Bars Demo to Vala (#137)

Author: Frogg1e

src/Level Bars/main.vala

@@ -0,0 +1,64 @@
+#! /usr/bin/env -S vala workbench.vala --pkg gtk4
+
+Gtk.PasswordEntry entry;
+Gtk.LevelBar bar_discrete;
+Gtk.Label label_strength;
+
+public void main () {
+    var bar_continuous = (Gtk.LevelBar) workbench.builder.get_object ("bar_continuous");
+
+    bar_continuous.add_offset_value ("full", 100);
+    bar_continuous.add_offset_value ("half", 50);
+    bar_continuous.add_offset_value ("low", 25);
+
+    bar_discrete = (Gtk.LevelBar) workbench.builder.get_object ("bar_discrete");
+
+    bar_discrete.add_offset_value ("very-weak", 1);
+    bar_discrete.add_offset_value ("weak", 2);
+    bar_discrete.add_offset_value ("moderate", 4);
+    bar_discrete.add_offset_value ("strong", 6);
+
+
+    entry = (Gtk.PasswordEntry) workbench.builder.get_object ("entry");
+
+    label_strength = (Gtk.Label) workbench.builder.get_object ("label_strength");
+
+    entry.notify["text"].connect (estimate_password_strength);
+}
+
+// This is not a secure way to estimate password strength
+// Use appropriate solutions instead
+// such as https://github.com/dropbox/zxcvbn
+
+public void estimate_password_strength () {
+    var level = (int) Math.fmin (Math.ceil ((entry.text.length + 1) / 2), 6);
+
+    label_strength.css_classes = new string[0];
+
+    switch (level) {
+    case 1:
+        label_strength.label = "Very Weak";
+        label_strength.add_css_class ("very-weak-label");
+        break;
+    case 2:
+        label_strength.label = "Weak";
+        label_strength.add_css_class ("weak-label");
+        break;
+    case 3:
+    case 4:
+        label_strength.label = "Moderate";
+        label_strength.add_css_class ("moderate-label");
+        break;
+    case 5:
+    case 6:
+        label_strength.label = "Strong";
+        label_strength.add_css_class ("strong-label");
+        break;
+    default:
+        label_strength.label = "";
+        label_strength.add_css_class ("");
+        break;
+    }
+
+    bar_discrete.value = level;
+}