Add Settings for vector-specific PointerIcon scale.

Bug: 305193969
Test: PointerScaleSeekBarControllerTest
Flag: com.android.systemui.enable_vector_cursor_a11y_settings
Change-Id: I2f344f1d5fc6d5c8eb7159570287b8ce6f9ac070

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

@@ -0,0 +1,95 @@
+/*
+ * Copyright 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.inputmethod;
+
+import static android.view.PointerIcon.DEFAULT_POINTER_SCALE;
+
+import android.content.Context;
+import android.content.res.Resources;
+import android.os.UserHandle;
+import android.provider.Settings;
+import android.widget.SeekBar;
+
+import androidx.annotation.NonNull;
+import androidx.preference.PreferenceScreen;
+
+import com.android.settings.R;
+import com.android.settings.core.BasePreferenceController;
+import com.android.settings.widget.LabeledSeekBarPreference;
+
+public class PointerScaleSeekBarController extends BasePreferenceController {
+
+    private final int mProgressMin;
+    private final int mProgressMax;
+    private final float mScaleMin;
+    private final float mScaleMax;
+
+    public PointerScaleSeekBarController(@NonNull Context context, @NonNull String key) {
+        super(context, key);
+
+        Resources res =  context.getResources();
+        mProgressMin = res.getInteger(R.integer.pointer_scale_seek_bar_start);
+        mProgressMax = res.getInteger(R.integer.pointer_scale_seek_bar_end);
+        mScaleMin = res.getFloat(R.dimen.pointer_scale_size_start);
+        mScaleMax = res.getFloat(R.dimen.pointer_scale_size_end);
+    }
+
+    @AvailabilityStatus
+    public int getAvailabilityStatus() {
+        return android.view.flags.Flags.enableVectorCursorA11ySettings() ? AVAILABLE
+                : CONDITIONALLY_UNAVAILABLE;
+    }
+
+    @Override
+    public void displayPreference(@NonNull PreferenceScreen screen) {
+        super.displayPreference(screen);
+
+        LabeledSeekBarPreference seekBarPreference = screen.findPreference(getPreferenceKey());
+        seekBarPreference.setMax(mProgressMax);
+        seekBarPreference.setContinuousUpdates(/* continuousUpdates= */ true);
+        seekBarPreference.setProgress(scaleToProgress(
+                Settings.System.getFloatForUser(mContext.getContentResolver(),
+                        Settings.System.POINTER_SCALE, DEFAULT_POINTER_SCALE,
+                        UserHandle.USER_CURRENT)));
+        seekBarPreference.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
+            @Override
+            public void onProgressChanged(@NonNull SeekBar seekBar, int progress,
+                    boolean fromUser) {
+                Settings.System.putFloatForUser(mContext.getContentResolver(),
+                        Settings.System.POINTER_SCALE, progressToScale(progress),
+                        UserHandle.USER_CURRENT);
+            }
+
+            @Override
+            public void onStartTrackingTouch(@NonNull SeekBar seekBar) {}
+
+            @Override
+            public void onStopTrackingTouch(@NonNull SeekBar seekBar) {}
+        });
+    }
+
+    private float progressToScale(int progress) {
+        return (((progress - mProgressMin) * (mScaleMax - mScaleMin)) / (mProgressMax
+                - mProgressMin)) + mScaleMin;
+    }
+
+    private int scaleToProgress(float scale) {
+        return (int) (
+                (((scale - mScaleMin) * (mProgressMax - mProgressMin)) / (mScaleMax - mScaleMin))
+                        + mProgressMin);
+    }
+}