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/*
* Copyright (C) 2018 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.widget;
import android.appwidget.AppWidgetHostView;
import android.content.Context;
import android.graphics.Rect;
import android.view.KeyEvent;
import android.view.View;
import android.view.ViewDebug;
import android.view.ViewGroup;
import java.util.ArrayList;
/**
* Extension of AppWidgetHostView with support for controlled keyboard navigation.
*/
public abstract class NavigableAppWidgetHostView extends AppWidgetHostView {
@ViewDebug.ExportedProperty(category = "launcher")
private boolean mChildrenFocused;
public NavigableAppWidgetHostView(Context context) {
super(context);
}
@Override
public int getDescendantFocusability() {
return mChildrenFocused ? ViewGroup.FOCUS_BEFORE_DESCENDANTS
: ViewGroup.FOCUS_BLOCK_DESCENDANTS;
}
@Override
public boolean dispatchKeyEvent(KeyEvent event) {
if (mChildrenFocused && event.getKeyCode() == KeyEvent.KEYCODE_ESCAPE
&& event.getAction() == KeyEvent.ACTION_UP) {
mChildrenFocused = false;
requestFocus();
return true;
}
return super.dispatchKeyEvent(event);
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (!mChildrenFocused && keyCode == KeyEvent.KEYCODE_ENTER) {
event.startTracking();
return true;
}
return super.onKeyDown(keyCode, event);
}
@Override
public boolean onKeyUp(int keyCode, KeyEvent event) {
if (event.isTracking()) {
if (!mChildrenFocused && keyCode == KeyEvent.KEYCODE_ENTER) {
mChildrenFocused = true;
ArrayList<View> focusableChildren = getFocusables(FOCUS_FORWARD);
focusableChildren.remove(this);
int childrenCount = focusableChildren.size();
switch (childrenCount) {
case 0:
mChildrenFocused = false;
break;
case 1: {
if (shouldAllowDirectClick()) {
focusableChildren.get(0).performClick();
mChildrenFocused = false;
return true;
}
// continue;
}
default:
focusableChildren.get(0).requestFocus();
return true;
}
}
}
return super.onKeyUp(keyCode, event);
}
/**
* For a widget with only a single interactive element, return true if whole widget should act
* as a single interactive element, and clicking 'enter' should activate the child element
* directly. Otherwise clicking 'enter' will only move the focus inside the widget.
*/
protected abstract boolean shouldAllowDirectClick();
@Override
protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) {
if (gainFocus) {
mChildrenFocused = false;
dispatchChildFocus(false);
}
super.onFocusChanged(gainFocus, direction, previouslyFocusedRect);
}
@Override
public void requestChildFocus(View child, View focused) {
super.requestChildFocus(child, focused);
dispatchChildFocus(mChildrenFocused && focused != null);
if (focused != null) {
focused.setFocusableInTouchMode(false);
}
}
@Override
public void clearChildFocus(View child) {
super.clearChildFocus(child);
dispatchChildFocus(false);
}
@Override
public boolean dispatchUnhandledMove(View focused, int direction) {
return mChildrenFocused;
}
private void dispatchChildFocus(boolean childIsFocused) {
// The host view's background changes when selected, to indicate the focus is inside.
setSelected(childIsFocused);
}
}
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