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/*
* Copyright 2021 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.taskbar;
import static com.android.internal.app.AssistUtils.INVOCATION_TYPE_HOME_BUTTON_LONG_PRESS;
import static com.android.internal.app.AssistUtils.INVOCATION_TYPE_KEY;
import static com.android.systemui.shared.system.QuickStepContract.SYSUI_STATE_SCREEN_PINNING;
import android.os.Bundle;
import android.os.Handler;
import androidx.annotation.IntDef;
import com.android.launcher3.testing.TestLogging;
import com.android.launcher3.testing.TestProtocol;
import com.android.quickstep.OverviewCommandHelper;
import com.android.quickstep.SystemUiProxy;
import com.android.quickstep.TouchInteractionService;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
/**
* Controller for 3 button mode in the taskbar.
* Handles all the functionality of the various buttons, making/routing the right calls into
* launcher or sysui/system.
*/
public class TaskbarNavButtonController {
/** Allow some time in between the long press for back and recents. */
static final int SCREEN_PIN_LONG_PRESS_THRESHOLD = 200;
static final int SCREEN_PIN_LONG_PRESS_RESET = SCREEN_PIN_LONG_PRESS_THRESHOLD + 100;
private long mLastScreenPinLongPress;
private boolean mScreenPinned;
@Retention(RetentionPolicy.SOURCE)
@IntDef(value = {
BUTTON_BACK,
BUTTON_HOME,
BUTTON_RECENTS,
BUTTON_IME_SWITCH,
BUTTON_A11Y,
})
public @interface TaskbarButton {}
static final int BUTTON_BACK = 1;
static final int BUTTON_HOME = BUTTON_BACK << 1;
static final int BUTTON_RECENTS = BUTTON_HOME << 1;
static final int BUTTON_IME_SWITCH = BUTTON_RECENTS << 1;
static final int BUTTON_A11Y = BUTTON_IME_SWITCH << 1;
private static final int SCREEN_UNPIN_COMBO = BUTTON_BACK | BUTTON_RECENTS;
private int mLongPressedButtons = 0;
private final TouchInteractionService mService;
private final SystemUiProxy mSystemUiProxy;
private final Handler mHandler;
private final Runnable mResetLongPress = this::resetScreenUnpin;
public TaskbarNavButtonController(TouchInteractionService service,
SystemUiProxy systemUiProxy, Handler handler) {
mService = service;
mSystemUiProxy = systemUiProxy;
mHandler = handler;
}
public void onButtonClick(@TaskbarButton int buttonType) {
switch (buttonType) {
case BUTTON_BACK:
executeBack();
break;
case BUTTON_HOME:
navigateHome();
break;
case BUTTON_RECENTS:
navigateToOverview();
break;
case BUTTON_IME_SWITCH:
showIMESwitcher();
break;
case BUTTON_A11Y:
notifyA11yClick(false /* longClick */);
break;
}
}
public boolean onButtonLongClick(@TaskbarButton int buttonType) {
switch (buttonType) {
case BUTTON_HOME:
startAssistant();
return true;
case BUTTON_A11Y:
notifyA11yClick(true /* longClick */);
return true;
case BUTTON_BACK:
case BUTTON_RECENTS:
mLongPressedButtons |= buttonType;
return determineScreenUnpin();
case BUTTON_IME_SWITCH:
default:
return false;
}
}
/**
* Checks if the user has long pressed back and recents buttons
* "together" (within {@link #SCREEN_PIN_LONG_PRESS_THRESHOLD})ms
* If so, then requests the system to turn off screen pinning.
*
* @return true if the long press is a valid user action in attempting to unpin an app
* Will always return {@code false} when screen pinning is not active.
* NOTE: Returning true does not mean that screen pinning has stopped
*/
private boolean determineScreenUnpin() {
long timeNow = System.currentTimeMillis();
if (!mScreenPinned) {
return false;
}
if (mLastScreenPinLongPress == 0) {
// First button long press registered, just mark time and wait for second button press
mLastScreenPinLongPress = System.currentTimeMillis();
mHandler.postDelayed(mResetLongPress, SCREEN_PIN_LONG_PRESS_RESET);
return true;
}
if ((timeNow - mLastScreenPinLongPress) > SCREEN_PIN_LONG_PRESS_THRESHOLD) {
// Too long in-between presses, reset the clock
resetScreenUnpin();
return false;
}
if ((mLongPressedButtons & SCREEN_UNPIN_COMBO) == SCREEN_UNPIN_COMBO) {
// Hooray! They did it (finally...)
mSystemUiProxy.stopScreenPinning();
mHandler.removeCallbacks(mResetLongPress);
resetScreenUnpin();
}
return true;
}
private void resetScreenUnpin() {
mLongPressedButtons = 0;
mLastScreenPinLongPress = 0;
}
public void updateSysuiFlags(int sysuiFlags) {
mScreenPinned = (sysuiFlags & SYSUI_STATE_SCREEN_PINNING) != 0;
}
private void navigateHome() {
mService.getOverviewCommandHelper().addCommand(OverviewCommandHelper.TYPE_HOME);
}
private void navigateToOverview() {
if (mScreenPinned) {
return;
}
TestLogging.recordEvent(TestProtocol.SEQUENCE_MAIN, "onOverviewToggle");
mService.getOverviewCommandHelper().addCommand(OverviewCommandHelper.TYPE_TOGGLE);
}
private void executeBack() {
mSystemUiProxy.onBackPressed();
}
private void showIMESwitcher() {
mSystemUiProxy.onImeSwitcherPressed();
}
private void notifyA11yClick(boolean longClick) {
if (longClick) {
mSystemUiProxy.notifyAccessibilityButtonLongClicked();
} else {
mSystemUiProxy.notifyAccessibilityButtonClicked(mService.getDisplayId());
}
}
private void startAssistant() {
if (mScreenPinned) {
return;
}
Bundle args = new Bundle();
args.putInt(INVOCATION_TYPE_KEY, INVOCATION_TYPE_HOME_BUTTON_LONG_PRESS);
mSystemUiProxy.startAssistant(args);
}
}
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