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/*
* Copyright (C) 2011 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 com.android.launcher3;
import android.animation.ObjectAnimator;
import android.animation.PropertyValuesHolder;
import android.content.Context;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.util.Pair;
import android.view.View;
import com.android.launcher3.util.Thunk;
public class FocusIndicatorView extends View implements View.OnFocusChangeListener {
// It can be any number >0. The view is resized using scaleX and scaleY.
static final int DEFAULT_LAYOUT_SIZE = 100;
private static final float MIN_VISIBLE_ALPHA = 0.2f;
private static final long ANIM_DURATION = 150;
private final int[] mIndicatorPos = new int[2];
private final int[] mTargetViewPos = new int[2];
private ObjectAnimator mCurrentAnimation;
private ViewAnimState mTargetState;
private View mLastFocusedView;
private boolean mInitiated;
private Pair<View, Boolean> mPendingCall;
public FocusIndicatorView(Context context) {
this(context, null);
}
public FocusIndicatorView(Context context, AttributeSet attrs) {
super(context, attrs);
setAlpha(0);
setBackgroundColor(getResources().getColor(R.color.focused_background));
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
// Redraw if it is already showing. This avoids a bug where the height changes by a small
// amount on connecting/disconnecting a bluetooth keyboard.
if (mLastFocusedView != null) {
mPendingCall = Pair.create(mLastFocusedView, Boolean.TRUE);
invalidate();
}
}
@Override
public void onFocusChange(View v, boolean hasFocus) {
mPendingCall = null;
if (!mInitiated && (getWidth() == 0)) {
// View not yet laid out. Wait until the view is ready to be drawn, so that be can
// get the location on screen.
mPendingCall = Pair.create(v, hasFocus);
invalidate();
return;
}
if (!mInitiated) {
// The parent view should always the a parent of the target view.
computeLocationRelativeToParent(this, (View) getParent(), mIndicatorPos);
mInitiated = true;
}
if (hasFocus) {
int indicatorWidth = getWidth();
int indicatorHeight = getHeight();
endCurrentAnimation();
ViewAnimState nextState = new ViewAnimState();
nextState.scaleX = v.getScaleX() * v.getWidth() / indicatorWidth;
nextState.scaleY = v.getScaleY() * v.getHeight() / indicatorHeight;
computeLocationRelativeToParent(v, (View) getParent(), mTargetViewPos);
nextState.x = mTargetViewPos[0] - mIndicatorPos[0] - (1 - nextState.scaleX) * indicatorWidth / 2;
nextState.y = mTargetViewPos[1] - mIndicatorPos[1] - (1 - nextState.scaleY) * indicatorHeight / 2;
if (getAlpha() > MIN_VISIBLE_ALPHA) {
mTargetState = nextState;
mCurrentAnimation = LauncherAnimUtils.ofPropertyValuesHolder(this,
PropertyValuesHolder.ofFloat(View.ALPHA, 1),
PropertyValuesHolder.ofFloat(View.TRANSLATION_X, mTargetState.x),
PropertyValuesHolder.ofFloat(View.TRANSLATION_Y, mTargetState.y),
PropertyValuesHolder.ofFloat(View.SCALE_X, mTargetState.scaleX),
PropertyValuesHolder.ofFloat(View.SCALE_Y, mTargetState.scaleY));
} else {
applyState(nextState);
mCurrentAnimation = LauncherAnimUtils.ofPropertyValuesHolder(this,
PropertyValuesHolder.ofFloat(View.ALPHA, 1));
}
mLastFocusedView = v;
} else {
if (mLastFocusedView == v) {
mLastFocusedView = null;
endCurrentAnimation();
mCurrentAnimation = LauncherAnimUtils.ofPropertyValuesHolder(this,
PropertyValuesHolder.ofFloat(View.ALPHA, 0));
}
}
if (mCurrentAnimation != null) {
mCurrentAnimation.setDuration(ANIM_DURATION).start();
}
}
private void endCurrentAnimation() {
if (mCurrentAnimation != null) {
mCurrentAnimation.cancel();
mCurrentAnimation = null;
}
if (mTargetState != null) {
applyState(mTargetState);
mTargetState = null;
}
}
private void applyState(ViewAnimState state) {
setTranslationX(state.x);
setTranslationY(state.y);
setScaleX(state.scaleX);
setScaleY(state.scaleY);
}
@Override
protected void onDraw(Canvas canvas) {
if (mPendingCall != null) {
onFocusChange(mPendingCall.first, mPendingCall.second);
}
}
/**
* Computes the location of a view relative to {@param parent}, off-setting
* any shift due to page view scroll.
* @param pos an array of two integers in which to hold the coordinates
*/
private static void computeLocationRelativeToParent(View v, View parent, int[] pos) {
pos[0] = pos[1] = 0;
computeLocationRelativeToParentHelper(v, parent, pos);
// If a view is scaled, its position will also shift accordingly. For optimization, only
// consider this for the last node.
pos[0] += (1 - v.getScaleX()) * v.getWidth() / 2;
pos[1] += (1 - v.getScaleY()) * v.getHeight() / 2;
}
private static void computeLocationRelativeToParentHelper(View child,
View commonParent, int[] shift) {
View parent = (View) child.getParent();
shift[0] += child.getLeft();
shift[1] += child.getTop();
if (parent instanceof PagedView) {
PagedView page = (PagedView) parent;
shift[0] -= page.getScrollForPage(page.indexOfChild(child));
}
if (parent != commonParent) {
computeLocationRelativeToParentHelper(parent, commonParent, shift);
}
}
@Thunk static final class ViewAnimState {
float x, y, scaleX, scaleY;
}
}
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