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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.content.Context;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.util.Pair;
import android.view.View;
import android.view.ViewParent;
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 int[] sTempPos = new int[2];
private static final int[] sTempShift = new int[2];
private final int[] mIndicatorPos = new int[2];
private final int[] mTargetViewPos = new int[2];
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) {
getLocationRelativeToParentPagedView(this, mIndicatorPos);
mInitiated = true;
}
if (hasFocus) {
int indicatorWidth = getWidth();
int indicatorHeight = getHeight();
float scaleX = v.getScaleX() * v.getWidth() / indicatorWidth;
float scaleY = v.getScaleY() * v.getHeight() / indicatorHeight;
getLocationRelativeToParentPagedView(v, mTargetViewPos);
float x = mTargetViewPos[0] - mIndicatorPos[0] - (1 - scaleX) * indicatorWidth / 2;
float y = mTargetViewPos[1] - mIndicatorPos[1] - (1 - scaleY) * indicatorHeight / 2;
if (getAlpha() > MIN_VISIBLE_ALPHA) {
animate()
.translationX(x)
.translationY(y)
.scaleX(scaleX)
.scaleY(scaleY)
.alpha(1);
} else {
setTranslationX(x);
setTranslationY(y);
setScaleX(scaleX);
setScaleY(scaleY);
animate().alpha(1);
}
mLastFocusedView = v;
} else {
if (mLastFocusedView == v) {
mLastFocusedView = null;
animate().alpha(0);
}
}
}
@Override
protected void onDraw(Canvas canvas) {
if (mPendingCall != null) {
onFocusChange(mPendingCall.first, mPendingCall.second);
}
}
/**
* Gets the location of a view relative in the window, off-setting any shift due to
* page view scroll
*/
private static void getLocationRelativeToParentPagedView(View v, int[] pos) {
getPagedViewScrollShift(v, sTempShift);
v.getLocationInWindow(sTempPos);
pos[0] = sTempPos[0] + sTempShift[0];
pos[1] = sTempPos[1] + sTempShift[1];
}
private static void getPagedViewScrollShift(View child, int[] shift) {
ViewParent parent = child.getParent();
if (parent instanceof PagedView) {
View parentView = (View) parent;
child.getLocationInWindow(sTempPos);
shift[0] = parentView.getPaddingLeft() - sTempPos[0];
shift[1] = -(int) child.getTranslationY();
} else if (parent instanceof View) {
getPagedViewScrollShift((View) parent, shift);
} else {
shift[0] = shift[1] = 0;
}
}
}
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