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/*
* 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 static android.support.annotation.RestrictTo.Scope.LIBRARY_GROUP;
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.os.Build;
import android.support.annotation.NonNull;
import android.support.annotation.RestrictTo;
import android.support.v4.graphics.drawable.DrawableCompat;
import android.util.Log;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
/** @hide */
@RestrictTo(LIBRARY_GROUP)
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 < 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 its 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 its 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);
}
/**
* Parses tint mode.
*/
public 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 PorterDuff.Mode.ADD;
default: return defaultMode;
}
}
}
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