117 lines
4.1 KiB
Java
117 lines
4.1 KiB
Java
/*
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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.transition;
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import android.view.View;
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/**
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* Base class for <code>TransitionPropagation</code>s that care about
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* View Visibility and the center position of the View.
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*/
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public abstract class VisibilityPropagation extends TransitionPropagation {
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/**
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* The property key used for {@link android.view.View#getVisibility()}.
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*/
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private static final String PROPNAME_VISIBILITY = "android:visibilityPropagation:visibility";
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/**
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* The property key used for the center of the View in screen coordinates. This is an
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* int[2] with the index 0 taking the x coordinate and index 1 taking the y coordinate.
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*/
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private static final String PROPNAME_VIEW_CENTER = "android:visibilityPropagation:center";
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private static final String[] VISIBILITY_PROPAGATION_VALUES = {
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PROPNAME_VISIBILITY,
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PROPNAME_VIEW_CENTER,
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};
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@Override
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public void captureValues(TransitionValues values) {
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View view = values.view;
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Integer visibility = (Integer) values.values.get(Visibility.PROPNAME_VISIBILITY);
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if (visibility == null) {
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visibility = view.getVisibility();
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}
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values.values.put(PROPNAME_VISIBILITY, visibility);
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int[] loc = new int[2];
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view.getLocationOnScreen(loc);
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loc[0] += Math.round(view.getTranslationX());
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loc[0] += view.getWidth() / 2;
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loc[1] += Math.round(view.getTranslationY());
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loc[1] += view.getHeight() / 2;
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values.values.put(PROPNAME_VIEW_CENTER, loc);
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}
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@Override
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public String[] getPropagationProperties() {
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return VISIBILITY_PROPAGATION_VALUES;
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}
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/**
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* Returns {@link android.view.View#getVisibility()} for the View at the time the values
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* were captured.
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* @param values The TransitionValues captured at the start or end of the Transition.
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* @return {@link android.view.View#getVisibility()} for the View at the time the values
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* were captured.
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*/
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public int getViewVisibility(TransitionValues values) {
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if (values == null) {
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return View.GONE;
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}
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Integer visibility = (Integer) values.values.get(PROPNAME_VISIBILITY);
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if (visibility == null) {
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return View.GONE;
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}
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return visibility;
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}
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/**
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* Returns the View's center x coordinate, relative to the screen, at the time the values
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* were captured.
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* @param values The TransitionValues captured at the start or end of the Transition.
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* @return the View's center x coordinate, relative to the screen, at the time the values
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* were captured.
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*/
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public int getViewX(TransitionValues values) {
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return getViewCoordinate(values, 0);
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}
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/**
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* Returns the View's center y coordinate, relative to the screen, at the time the values
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* were captured.
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* @param values The TransitionValues captured at the start or end of the Transition.
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* @return the View's center y coordinate, relative to the screen, at the time the values
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* were captured.
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*/
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public int getViewY(TransitionValues values) {
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return getViewCoordinate(values, 1);
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}
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private static int getViewCoordinate(TransitionValues values, int coordinateIndex) {
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if (values == null) {
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return -1;
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}
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int[] coordinates = (int[]) values.values.get(PROPNAME_VIEW_CENTER);
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if (coordinates == null) {
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return -1;
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}
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return coordinates[coordinateIndex];
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}
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}
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