ConfigList: A better toggle switch

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

app/src/main/java/com/wireguard/android/bindings/BindingAdapters.java

@@ -10,6 +10,7 @@ import android.widget.ListView;
 import android.widget.TextView;
 
 import com.wireguard.android.R;
+import com.wireguard.android.widgets.ToggleSwitch;
 
 /**
  * Static methods for use by generated code in the Android data binding library.
@@ -17,6 +18,11 @@ import com.wireguard.android.R;
 
 @SuppressWarnings("unused")
 public final class BindingAdapters {
+    @BindingAdapter({"app:checked"})
+    public static void setChecked(final ToggleSwitch view, final boolean checked) {
+        view.setCheckedInternal(checked);
+    }
+
     @BindingAdapter({"filter"})
     public static void setFilter(final TextView view, final InputFilter filter) {
         view.setFilters(new InputFilter[]{filter});
@@ -99,6 +105,13 @@ public final class BindingAdapters {
         adapter.setMap(newMap);
     }
 
+    @BindingAdapter({"app:onBeforeCheckedChanged"})
+    public static void setOnBeforeCheckedChanged(final ToggleSwitch view,
+                                                 final ToggleSwitch.OnBeforeCheckedChangeListener
+                                                         listener) {
+        view.setOnBeforeCheckedChangeListener(listener);
+    }
+
     @BindingAdapter({"android:textStyle"})
     public static void setTextStyle(final TextView view, final Typeface typeface) {
         view.setTypeface(typeface);

app/src/main/java/com/wireguard/android/widgets/ToggleSwitch.java

@@ -21,43 +21,52 @@ import android.util.AttributeSet;
 import android.widget.Switch;
 
 public class ToggleSwitch extends Switch {
+    private boolean hasPendingStateChange;
+    private OnBeforeCheckedChangeListener listener;
 
-    private ToggleSwitch.OnBeforeCheckedChangeListener mOnBeforeListener;
+    public interface OnBeforeCheckedChangeListener {
-
+        void onBeforeCheckedChanged(ToggleSwitch toggleSwitch, boolean checked);
-    public static interface OnBeforeCheckedChangeListener {
-        public boolean onBeforeCheckedChanged(ToggleSwitch toggleSwitch, boolean checked);
     }
 
-    public ToggleSwitch(Context context) {
+    public ToggleSwitch(final Context context) {
         super(context);
     }
 
-    public ToggleSwitch(Context context, AttributeSet attrs) {
+    public ToggleSwitch(final Context context, final AttributeSet attrs) {
         super(context, attrs);
     }
 
-    public ToggleSwitch(Context context, AttributeSet attrs, int defStyleAttr) {
+    public ToggleSwitch(final Context context, final AttributeSet attrs, final int defStyleAttr) {
         super(context, attrs, defStyleAttr);
     }
 
-    public ToggleSwitch(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
+    public ToggleSwitch(final Context context, final AttributeSet attrs, final int defStyleAttr,
+                        final int defStyleRes) {
         super(context, attrs, defStyleAttr, defStyleRes);
     }
 
-    public void setOnBeforeCheckedChangeListener(OnBeforeCheckedChangeListener listener) {
+    public void setOnBeforeCheckedChangeListener(final OnBeforeCheckedChangeListener listener) {
-        mOnBeforeListener = listener;
+        this.listener = listener;
     }
 
     @Override
-    public void setChecked(boolean checked) {
+    public void setChecked(final boolean checked) {
-        if (mOnBeforeListener != null
+        if (listener != null) {
-                && mOnBeforeListener.onBeforeCheckedChanged(this, checked)) {
+            if (!isEnabled())
-            return;
+                return;
+            setEnabled(false);
+            hasPendingStateChange = true;
+            listener.onBeforeCheckedChanged(this, checked);
+        } else {
+            super.setChecked(checked);
+        }
+    }
+
+    public void setCheckedInternal(final boolean checked) {
+        if (hasPendingStateChange) {
+            setEnabled(true);
+            hasPendingStateChange = false;
         }
         super.setChecked(checked);
     }
-
-    public void setCheckedInternal(boolean checked) {
-        super.setChecked(checked);
-    }
 }

app/src/main/res/layout/config_list_item.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
-<layout xmlns:android="http://schemas.android.com/apk/res/android">
+<layout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
 
     <data>
 
@@ -35,13 +36,13 @@
             android:text="@{key}"
             android:textStyle="@{item.primary ? Typeface.DEFAULT_BOLD : Typeface.DEFAULT}" />
 
-        <Switch
+        <com.wireguard.android.widgets.ToggleSwitch
             android:id="@+id/config_switch"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_alignBaseline="@+id/config_name"
             android:layout_alignParentEnd="true"
-            android:checked="@{item.enabled}"
+            app:checked="@{item.enabled}"
-            android:onCheckedChanged="@{(v, checked) -> checked ? VpnService.instance.enable(item.name) : VpnService.instance.disable(item.name)}" />
+            app:onBeforeCheckedChanged="@{(v, checked) -> checked ? VpnService.instance.enable(item.name) : VpnService.instance.disable(item.name)}" />
     </RelativeLayout>
 </layout>