Settings: Use seekbar to allow setting arbitrary animation values

frap129: Reworked for Pie, set default scale to 0.5f, and improved
the preference summaries so they match AOSP while keeping translations.

Change-Id: I29d89e532d07a325f6e568b21e4da4ce7e5761ac
Signed-off-by: Joe Maples <joe@frap129.org>
[jaysonedson: Fix fc when not using English and preference]
Signed-off-by: Jason Edson <jaysonedson@gmail.com>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>

src/com/android/settings/IntervalSeekBar.java

@@ -0,0 +1,103 @@
+/*
+ * Copyright (C) 2017 The Pure Nexus 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;
+
+import android.content.Context;
+import android.content.res.TypedArray;
+import android.util.AttributeSet;
+import android.util.Log;
+import android.widget.SeekBar;
+
+/**
+ * Custom SeekBar that allows setting both a minimum and maximum value.
+ * This also handles floating point values (to 2 decimal places) through
+ * integer conversions.
+ */
+public class IntervalSeekBar extends SeekBar {
+    private float mMin;
+    private float mMax;
+    private float mDefault;
+    private float mMultiplier;
+
+    public IntervalSeekBar(Context context, AttributeSet attrs) {
+        super(context, attrs);
+
+        TypedArray seekBarType = context.obtainStyledAttributes(attrs,
+                R.styleable.IntervalSeekBar, 0, 0);
+
+        mMax = seekBarType.getFloat(R.styleable.IntervalSeekBar_maxI, 1.5f);
+        mMin = seekBarType.getFloat(R.styleable.IntervalSeekBar_minI, 0.0f);
+        mDefault = seekBarType.getFloat(R.styleable.IntervalSeekBar_defaultValuePure, 1.0f);
+
+        int digits = seekBarType.getInt(R.styleable.IntervalSeekBar_digits, 0);
+        mMultiplier = (float) Math.pow(10, digits);
+
+        if (mMin > mMax) {
+            float temp = mMax;
+            mMax = mMin;
+            mMin = temp;
+        }
+
+        setMax(convertFloatToProgress(mMax));
+        setProgressFloat(mDefault);
+
+        seekBarType.recycle();
+    }
+
+    /*
+     * Converts from SeekBar units (which the SeekBar uses), to scale units
+     *  (which are saved).
+     *  This operation is the inverse of setFontScaling.
+     */
+    public float getProgressFloat() {
+        return (getProgress() / mMultiplier) + mMin;
+    }
+
+    /*
+     * Converts from scale units (which are saved), to SeekBar units
+     * (which the SeekBar uses). This also sets the SeekBar progress.
+     * This operation is the inverse of getProgressFloat.
+     */
+    public void setProgressFloat(float progress) {
+        setProgress(convertFloatToProgress(progress));
+    }
+
+    private int convertFloatToProgress(float value) {
+        return Math.round((value - mMin) * mMultiplier);
+    }
+
+    public float getMinimum() {
+        return mMin;
+    }
+
+    public float getMaximum() {
+        return mMax;
+    }
+
+    public float getDefault() {
+        return mDefault;
+    }
+
+    public void setMaximum(float max) {
+        mMax = max;
+        setMax(convertFloatToProgress(mMax));
+    }
+
+    public void setMinimum(float min) {
+        mMin = min;
+    }
+}