Merge "Create TintDrawable in Settings." into qt-dev

src/com/android/settings/widget/TintDrawable.java

@@ -0,0 +1,101 @@
+/*
+ * Copyright (C) 2019 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.widget;
+
+import android.annotation.NonNull;
+import android.annotation.Nullable;
+import android.content.res.ColorStateList;
+import android.content.res.Resources;
+import android.content.res.Resources.Theme;
+import android.content.res.TypedArray;
+import android.graphics.drawable.DrawableWrapper;
+import android.util.AttributeSet;
+import android.util.Log;
+
+import com.android.settings.R;
+
+import org.xmlpull.v1.XmlPullParser;
+import org.xmlpull.v1.XmlPullParserException;
+
+import java.io.IOException;
+
+/**
+ * A Drawable that tints a contained Drawable, overriding the existing tint specified in the
+ * underlying drawable. This class should only be used in XML.
+ *
+ * @attr ref android.R.styleable#DrawableWrapper_drawable
+ * @attr ref R.styleable#TintDrawable_tint
+ */
+public class TintDrawable extends DrawableWrapper {
+    private ColorStateList mTint;
+    private int[] mThemeAttrs;
+
+    /** No-arg constructor used by drawable inflation. */
+    public TintDrawable() {
+        super(null);
+    }
+
+    @Override
+    public void inflate(@NonNull Resources r, @NonNull XmlPullParser parser,
+            @NonNull AttributeSet attrs, @Nullable Theme theme)
+            throws XmlPullParserException, IOException {
+        final TypedArray a = obtainAttributes(r, theme, attrs, R.styleable.TintDrawable);
+
+        super.inflate(r, parser, attrs, theme);
+
+        mThemeAttrs = a.extractThemeAttrs();
+        updateStateFromTypedArray(a);
+        a.recycle();
+
+        applyTint();
+    }
+
+    @Override
+    public void applyTheme(Theme t) {
+        super.applyTheme(t);
+
+        if (mThemeAttrs != null) {
+            final TypedArray a = t.resolveAttributes(mThemeAttrs, R.styleable.TintDrawable);
+            updateStateFromTypedArray(a);
+            a.recycle();
+        }
+
+        // Ensure tint is reapplied after applying the theme to ensure this drawables'
+        // tint overrides the underlying drawables' tint.
+        applyTint();
+    }
+
+    @Override
+    public boolean canApplyTheme() {
+        return (mThemeAttrs != null && mThemeAttrs.length > 0) || super.canApplyTheme();
+    }
+
+    private void updateStateFromTypedArray(@NonNull TypedArray a) {
+        if (a.hasValue(R.styleable.TintDrawable_android_drawable)) {
+            setDrawable(a.getDrawable(R.styleable.TintDrawable_android_drawable));
+        }
+        if (a.hasValue(R.styleable.TintDrawable_android_tint)) {
+            mTint = a.getColorStateList(R.styleable.TintDrawable_android_tint);
+        }
+    }
+
+    private void applyTint() {
+        if (getDrawable() != null && mTint != null) {
+            getDrawable().mutate().setTintList(mTint);
+        }
+    }
+}