109 lines
4.2 KiB
Java
109 lines
4.2 KiB
Java
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/*
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* Copyright (C) 2017 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 com.android.internal.widget;
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import android.util.ArraySet;
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import android.view.View;
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import android.view.ViewGroup;
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import android.view.ViewParent;
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import com.android.internal.R;
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/**
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* A utility class that allows to clip views and their parents to allow for better transitions
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*/
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public class ViewClippingUtil {
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private static final int CLIP_CLIPPING_SET = R.id.clip_children_set_tag;
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private static final int CLIP_CHILDREN_TAG = R.id.clip_children_tag;
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private static final int CLIP_TO_PADDING = R.id.clip_to_padding_tag;
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public static void setClippingDeactivated(final View transformedView, boolean deactivated,
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ClippingParameters clippingParameters) {
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if (!deactivated && !clippingParameters.isClippingEnablingAllowed(transformedView)) {
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return;
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}
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if (!(transformedView.getParent() instanceof ViewGroup)) {
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return;
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}
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ViewGroup parent = (ViewGroup) transformedView.getParent();
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while (true) {
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if (!deactivated && !clippingParameters.isClippingEnablingAllowed(transformedView)) {
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return;
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}
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ArraySet<View> clipSet = (ArraySet<View>) parent.getTag(CLIP_CLIPPING_SET);
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if (clipSet == null) {
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clipSet = new ArraySet<>();
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parent.setTagInternal(CLIP_CLIPPING_SET, clipSet);
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}
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Boolean clipChildren = (Boolean) parent.getTag(CLIP_CHILDREN_TAG);
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if (clipChildren == null) {
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clipChildren = parent.getClipChildren();
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parent.setTagInternal(CLIP_CHILDREN_TAG, clipChildren);
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}
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Boolean clipToPadding = (Boolean) parent.getTag(CLIP_TO_PADDING);
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if (clipToPadding == null) {
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clipToPadding = parent.getClipToPadding();
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parent.setTagInternal(CLIP_TO_PADDING, clipToPadding);
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}
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if (!deactivated) {
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clipSet.remove(transformedView);
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if (clipSet.isEmpty()) {
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parent.setClipChildren(clipChildren);
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parent.setClipToPadding(clipToPadding);
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parent.setTagInternal(CLIP_CLIPPING_SET, null);
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clippingParameters.onClippingStateChanged(parent, true);
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}
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} else {
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clipSet.add(transformedView);
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parent.setClipChildren(false);
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parent.setClipToPadding(false);
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clippingParameters.onClippingStateChanged(parent, false);
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}
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if (clippingParameters.shouldFinish(parent)) {
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return;
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}
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final ViewParent viewParent = parent.getParent();
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if (viewParent instanceof ViewGroup) {
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parent = (ViewGroup) viewParent;
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} else {
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return;
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}
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}
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}
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public interface ClippingParameters {
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/**
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* Should we stop clipping at this view? If true is returned, {@param view} is the last view
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* where clipping is activated / deactivated.
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*/
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boolean shouldFinish(View view);
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/**
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* Is it allowed to enable clipping on this view.
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*/
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default boolean isClippingEnablingAllowed(View view) {
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return !MessagingPropertyAnimator.isAnimatingTranslation(view);
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}
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/**
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* A method that is called whenever the view starts clipping again / stops clipping to the
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* children and padding.
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*/
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default void onClippingStateChanged(View view, boolean isClipping) {};
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}
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}
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