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