Show selected folders in navigation menu

app/src/main/java/eu/faircode/email/NavMenuItem.java

@@ -0,0 +1,65 @@
+package eu.faircode.email;
+
+import androidx.annotation.Nullable;
+
+import java.util.Objects;
+
+public class NavMenuItem {
+    private int icon;
+    private int title;
+    private Integer count = null;
+    private Runnable click;
+    private Runnable longClick;
+
+    NavMenuItem(int icon, int title, Runnable click) {
+        this.icon = icon;
+        this.title = title;
+        this.click = click;
+    }
+
+    NavMenuItem(int icon, int title, Runnable click, Runnable longClick) {
+        this.icon = icon;
+        this.title = title;
+        this.click = click;
+        this.longClick = longClick;
+    }
+
+    void setCount(Integer count) {
+        if (count != null && count == 0)
+            count = null;
+        this.count = count;
+    }
+
+    int getIcon() {
+        return this.icon;
+    }
+
+    int getTitle() {
+        return this.title;
+    }
+
+    Integer getCount() {
+        return this.count;
+    }
+
+    void onClick() {
+        click.run();
+    }
+
+    boolean onLongClick() {
+        if (longClick != null)
+            longClick.run();
+        return (longClick != null);
+    }
+
+    @Override
+    public boolean equals(@Nullable Object obj) {
+        if (obj instanceof NavMenuItem) {
+            NavMenuItem other = (NavMenuItem) obj;
+            return (this.icon == other.icon &&
+                    this.title == other.title &&
+                    Objects.equals(this.count, other.count));
+        } else
+            return false;
+    }
+}