100 lines
3.5 KiB
Java
100 lines
3.5 KiB
Java
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/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.support.v7.internal.widget;
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import android.graphics.Rect;
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import android.graphics.drawable.Drawable;
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import android.os.Build;
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import android.support.v4.graphics.drawable.DrawableCompat;
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import android.util.Log;
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import java.lang.reflect.Field;
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import java.lang.reflect.Method;
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/**
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* @hide
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*/
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public class DrawableUtils {
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private static final String TAG = "DrawableUtils";
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public static final Rect INSETS_NONE = new Rect();
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private static Class<?> sInsetsClazz;
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static {
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if (Build.VERSION.SDK_INT >= 18) {
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try {
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sInsetsClazz = Class.forName("android.graphics.Insets");
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} catch (ClassNotFoundException e) {
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// Oh well...
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}
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}
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}
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private DrawableUtils() {}
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/**
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* Allows us to get the optical insets for a {@link Drawable}. Since this is hidden we need to
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* use reflection. Since the {@code Insets} class is hidden also, we return a Rect instead.
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*/
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public static Rect getOpticalBounds(Drawable drawable) {
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if (sInsetsClazz != null) {
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try {
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// If the Drawable is wrapped, we need to manually unwrap it and process
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// the wrapped drawable.
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drawable = DrawableCompat.unwrap(drawable);
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final Method getOpticalInsetsMethod = drawable.getClass()
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.getMethod("getOpticalInsets");
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final Object insets = getOpticalInsetsMethod.invoke(drawable);
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if (insets != null) {
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// If the drawable has some optical insets, let's copy them into a Rect
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final Rect result = new Rect();
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for (Field field : sInsetsClazz.getFields()) {
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switch (field.getName()) {
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case "left":
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result.left = field.getInt(insets);
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break;
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case "top":
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result.top = field.getInt(insets);
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break;
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case "right":
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result.right = field.getInt(insets);
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break;
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case "bottom":
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result.bottom = field.getInt(insets);
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break;
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}
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}
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return result;
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}
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} catch (Exception e) {
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// Eugh, we hit some kind of reflection issue...
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Log.e(TAG, "Couldn't obtain the optical insets. Ignoring.");
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}
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}
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// If we reach here, either we're running on a device pre-v18, the Drawable didn't have
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// any optical insets, or a reflection issue, so we'll just return an empty rect
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return INSETS_NONE;
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}
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}
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