| /* |
| * Copyright (C) 2014 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 android.support.v7.widget; |
| |
| import android.graphics.PorterDuff; |
| import android.graphics.Rect; |
| import android.graphics.drawable.Drawable; |
| import android.graphics.drawable.DrawableContainer; |
| import android.graphics.drawable.GradientDrawable; |
| import android.graphics.drawable.InsetDrawable; |
| import android.graphics.drawable.LayerDrawable; |
| import android.graphics.drawable.ScaleDrawable; |
| import android.graphics.drawable.StateListDrawable; |
| import android.os.Build; |
| import android.support.annotation.NonNull; |
| import android.support.v4.graphics.drawable.DrawableCompat; |
| import android.util.Log; |
| |
| import java.lang.reflect.Field; |
| import java.lang.reflect.Method; |
| |
| /** @hide */ |
| public class DrawableUtils { |
| |
| private static final String TAG = "DrawableUtils"; |
| |
| public static final Rect INSETS_NONE = new Rect(); |
| private static Class<?> sInsetsClazz; |
| |
| private static final String VECTOR_DRAWABLE_CLAZZ_NAME |
| = "android.graphics.drawable.VectorDrawable"; |
| |
| static { |
| if (Build.VERSION.SDK_INT >= 18) { |
| try { |
| sInsetsClazz = Class.forName("android.graphics.Insets"); |
| } catch (ClassNotFoundException e) { |
| // Oh well... |
| } |
| } |
| } |
| |
| private DrawableUtils() {} |
| |
| /** |
| * Allows us to get the optical insets for a {@link Drawable}. Since this is hidden we need to |
| * use reflection. Since the {@code Insets} class is hidden also, we return a Rect instead. |
| */ |
| public static Rect getOpticalBounds(Drawable drawable) { |
| if (sInsetsClazz != null) { |
| try { |
| // If the Drawable is wrapped, we need to manually unwrap it and process |
| // the wrapped drawable. |
| drawable = DrawableCompat.unwrap(drawable); |
| |
| final Method getOpticalInsetsMethod = drawable.getClass() |
| .getMethod("getOpticalInsets"); |
| final Object insets = getOpticalInsetsMethod.invoke(drawable); |
| |
| if (insets != null) { |
| // If the drawable has some optical insets, let's copy them into a Rect |
| final Rect result = new Rect(); |
| |
| for (Field field : sInsetsClazz.getFields()) { |
| switch (field.getName()) { |
| case "left": |
| result.left = field.getInt(insets); |
| break; |
| case "top": |
| result.top = field.getInt(insets); |
| break; |
| case "right": |
| result.right = field.getInt(insets); |
| break; |
| case "bottom": |
| result.bottom = field.getInt(insets); |
| break; |
| } |
| } |
| return result; |
| } |
| } catch (Exception e) { |
| // Eugh, we hit some kind of reflection issue... |
| Log.e(TAG, "Couldn't obtain the optical insets. Ignoring."); |
| } |
| } |
| |
| // If we reach here, either we're running on a device pre-v18, the Drawable didn't have |
| // any optical insets, or a reflection issue, so we'll just return an empty rect |
| return INSETS_NONE; |
| } |
| |
| /** |
| * Attempt the fix any issues in the given drawable, usually caused by platform bugs in the |
| * implementation. This method should be call after retrieval from |
| * {@link android.content.res.Resources} or a {@link android.content.res.TypedArray}. |
| */ |
| static void fixDrawable(@NonNull final Drawable drawable) { |
| if (Build.VERSION.SDK_INT == 21 |
| && VECTOR_DRAWABLE_CLAZZ_NAME.equals(drawable.getClass().getName())) { |
| fixVectorDrawableTinting(drawable); |
| } |
| } |
| |
| /** |
| * Some drawable implementations have problems with mutation. This method returns false if |
| * there is a known issue in the given drawable's implementation. |
| */ |
| public static boolean canSafelyMutateDrawable(@NonNull Drawable drawable) { |
| if (Build.VERSION.SDK_INT < 8 && drawable instanceof StateListDrawable) { |
| // StateListDrawable has a bug in mutate() on API 7 |
| return false; |
| } else if (Build.VERSION.SDK_INT < 15 && drawable instanceof InsetDrawable) { |
| return false; |
| } else if (Build.VERSION.SDK_INT < 15 && drawable instanceof GradientDrawable) { |
| // GradientDrawable has a bug pre-ICS which results in mutate() resulting |
| // in loss of color |
| return false; |
| } else if (Build.VERSION.SDK_INT < 17 && drawable instanceof LayerDrawable) { |
| return false; |
| } |
| |
| if (drawable instanceof DrawableContainer) { |
| // If we have a DrawableContainer, let's traverse it's child array |
| final Drawable.ConstantState state = drawable.getConstantState(); |
| if (state instanceof DrawableContainer.DrawableContainerState) { |
| final DrawableContainer.DrawableContainerState containerState = |
| (DrawableContainer.DrawableContainerState) state; |
| for (final Drawable child : containerState.getChildren()) { |
| if (!canSafelyMutateDrawable(child)) { |
| return false; |
| } |
| } |
| } |
| } else if (drawable instanceof android.support.v4.graphics.drawable.DrawableWrapper) { |
| return canSafelyMutateDrawable( |
| ((android.support.v4.graphics.drawable.DrawableWrapper) drawable) |
| .getWrappedDrawable()); |
| } else if (drawable instanceof android.support.v7.graphics.drawable.DrawableWrapper) { |
| return canSafelyMutateDrawable( |
| ((android.support.v7.graphics.drawable.DrawableWrapper) drawable) |
| .getWrappedDrawable()); |
| } else if (drawable instanceof ScaleDrawable) { |
| return canSafelyMutateDrawable(((ScaleDrawable) drawable).getDrawable()); |
| } |
| |
| return true; |
| } |
| |
| /** |
| * VectorDrawable has an issue on API 21 where it sometimes doesn't create its tint filter. |
| * Fixed by toggling it's state to force a filter creation. |
| */ |
| private static void fixVectorDrawableTinting(final Drawable drawable) { |
| final int[] originalState = drawable.getState(); |
| if (originalState == null || originalState.length == 0) { |
| // The drawable doesn't have a state, so set it to be checked |
| drawable.setState(ThemeUtils.CHECKED_STATE_SET); |
| } else { |
| // Else the drawable does have a state, so clear it |
| drawable.setState(ThemeUtils.EMPTY_STATE_SET); |
| } |
| // Now set the original state |
| drawable.setState(originalState); |
| } |
| |
| static PorterDuff.Mode parseTintMode(int value, PorterDuff.Mode defaultMode) { |
| switch (value) { |
| case 3: return PorterDuff.Mode.SRC_OVER; |
| case 5: return PorterDuff.Mode.SRC_IN; |
| case 9: return PorterDuff.Mode.SRC_ATOP; |
| case 14: return PorterDuff.Mode.MULTIPLY; |
| case 15: return PorterDuff.Mode.SCREEN; |
| case 16: return Build.VERSION.SDK_INT >= 11 |
| ? PorterDuff.Mode.valueOf("ADD") |
| : defaultMode; |
| default: return defaultMode; |
| } |
| } |
| |
| } |
