[Physical Keyboard] Add slow keys dialog

demo: https://screenshot.googleplex.com/7CPpfHvAixe9Awr.png
Add dialog for Slow keys, which have same set up with Bounce keys.
Move dialog logic to InputSettingPreferenceController, to reuse it from
slow keys controller.

Bug: 346949547
Test: atest SettingsRoboTests
Flag: com.android.settings.keyboard.keyboard_and_touchpad_a11y_new_page_enabled

Change-Id: Ia4d74fcf3f20ed68cb252503e88d99ea79eae291

src/com/android/settings/inputmethod/KeyboardAccessibilitySlowKeysController.java

@@ -20,27 +20,34 @@ import android.content.Context;
 import android.hardware.input.InputSettings;
 import android.net.Uri;
 import android.provider.Settings;
+import android.text.TextUtils;
 
 import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
 import androidx.lifecycle.LifecycleObserver;
+import androidx.preference.Preference;
 import androidx.preference.PreferenceScreen;
-import androidx.preference.TwoStatePreference;
+
+import com.android.settings.R;
+import com.android.settingslib.PrimarySwitchPreference;
 
 public class KeyboardAccessibilitySlowKeysController extends
         InputSettingPreferenceController implements
         LifecycleObserver {
     public static final int SLOW_KEYS_THRESHOLD = 500;
 
-    private TwoStatePreference mTwoStatePreference;
+    @Nullable
+    private PrimarySwitchPreference mPrimarySwitchPreference;
 
     public KeyboardAccessibilitySlowKeysController(@NonNull Context context, @NonNull String key) {
         super(context, key);
+        constructDialog(context, R.string.slow_keys, R.string.slow_keys_summary);
     }
 
     @Override
     public void displayPreference(@NonNull PreferenceScreen screen) {
         super.displayPreference(screen);
-        mTwoStatePreference = screen.findPreference(getPreferenceKey());
+        mPrimarySwitchPreference = screen.findPreference(getPreferenceKey());
     }
 
     @Override
@@ -50,8 +57,7 @@ public class KeyboardAccessibilitySlowKeysController extends
 
     @Override
     public boolean setChecked(boolean isChecked) {
-        InputSettings.setAccessibilitySlowKeysThreshold(mContext,
-                isChecked ? SLOW_KEYS_THRESHOLD : 0);
+        updateInputSettingKeysValue(isChecked ? SLOW_KEYS_THRESHOLD : 0);
         return true;
     }
 
@@ -64,8 +70,8 @@ public class KeyboardAccessibilitySlowKeysController extends
 
     @Override
     protected void onInputSettingUpdated() {
-        if (mTwoStatePreference != null) {
-            mTwoStatePreference.setChecked(
+        if (mPrimarySwitchPreference != null) {
+            mPrimarySwitchPreference.setChecked(
                     InputSettings.isAccessibilitySlowKeysEnabled(mContext));
         }
     }
@@ -75,4 +81,25 @@ public class KeyboardAccessibilitySlowKeysController extends
         return Settings.Secure.getUriFor(
                 Settings.Secure.ACCESSIBILITY_SLOW_KEYS);
     }
+
+    @Override
+    public boolean handlePreferenceTreeClick(@NonNull Preference preference) {
+        if (!TextUtils.equals(preference.getKey(), getPreferenceKey())) {
+            return false;
+        }
+        if (mAlertDialog != null) {
+            mAlertDialog.show();
+        }
+        return true;
+    }
+
+    @Override
+    protected void updateInputSettingKeysValue(int thresholdTimeMillis) {
+        InputSettings.setAccessibilitySlowKeysThreshold(mContext, thresholdTimeMillis);
+    }
+
+    @Override
+    protected int getInputSettingKeysValue() {
+        return InputSettings.getAccessibilitySlowKeysThreshold(mContext);
+    }
 }