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/*
* Copyright (C) 2020 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.systemui.accessibility;
import static android.view.WindowManager.LayoutParams.TYPE_ACCESSIBILITY_MAGNIFICATION_OVERLAY;
import static com.android.systemui.accessibility.MagnificationModeSwitch.SwitchListener;
import android.annotation.MainThread;
import android.content.Context;
import android.hardware.display.DisplayManager;
import android.view.Display;
import com.android.internal.annotations.VisibleForTesting;
import com.android.systemui.dagger.SysUISingleton;
import javax.inject.Inject;
/**
* A class to control {@link MagnificationModeSwitch}. It shows the button UI with following
* conditions:
* <ol>
* <li> Both full-screen and window magnification mode are capable.</li>
* <li> The magnification scale is changed by a user.</li>
* <ol>
* The switch action will be handled by {@link #mSwitchListenerDelegate} which informs the system
* server about the changed mode.
*/
@SysUISingleton
public class ModeSwitchesController implements SwitchListener {
private final DisplayIdIndexSupplier<MagnificationModeSwitch> mSwitchSupplier;
private SwitchListener mSwitchListenerDelegate;
@Inject
public ModeSwitchesController(Context context) {
mSwitchSupplier = new SwitchSupplier(context,
context.getSystemService(DisplayManager.class), this::onSwitch);
}
@VisibleForTesting
ModeSwitchesController(DisplayIdIndexSupplier<MagnificationModeSwitch> switchSupplier) {
mSwitchSupplier = switchSupplier;
}
/**
* Shows a button that a user can click to switch magnification mode. And the button
* would be dismissed automatically after the button is displayed for a period of time.
*
* @param displayId The logical display id
* @param mode The magnification mode
* @see android.provider.Settings.Secure.ACCESSIBILITY_MAGNIFICATION_MODE_WINDOW
* @see android.provider.Settings.Secure.ACCESSIBILITY_MAGNIFICATION_MODE_FULLSCREEN
*/
@MainThread
void showButton(int displayId, int mode) {
final MagnificationModeSwitch magnificationModeSwitch =
mSwitchSupplier.get(displayId);
if (magnificationModeSwitch == null) {
return;
}
magnificationModeSwitch.showButton(mode);
}
/**
* Removes magnification mode switch button immediately.
*
* @param displayId The logical display id
*/
void removeButton(int displayId) {
final MagnificationModeSwitch magnificationModeSwitch =
mSwitchSupplier.get(displayId);
if (magnificationModeSwitch == null) {
return;
}
magnificationModeSwitch.removeButton();
}
/**
* Called when the configuration has changed, and it updates magnification button UI.
*
* @param configDiff a bit mask of the differences between the configurations
*/
@MainThread
void onConfigurationChanged(int configDiff) {
mSwitchSupplier.forEach(
switchController -> switchController.onConfigurationChanged(configDiff));
}
@Override
public void onSwitch(int displayId, int magnificationMode) {
if (mSwitchListenerDelegate != null) {
mSwitchListenerDelegate.onSwitch(displayId, magnificationMode);
}
}
public void setSwitchListenerDelegate(SwitchListener switchListenerDelegate) {
mSwitchListenerDelegate = switchListenerDelegate;
}
private static class SwitchSupplier extends DisplayIdIndexSupplier<MagnificationModeSwitch> {
private final Context mContext;
private final SwitchListener mSwitchListener;
/**
* Supplies the switch for the given display.
*
* @param context Context
* @param displayManager DisplayManager
* @param switchListener The callback that will run when the switch is clicked
*/
SwitchSupplier(Context context, DisplayManager displayManager,
SwitchListener switchListener) {
super(displayManager);
mContext = context;
mSwitchListener = switchListener;
}
@Override
protected MagnificationModeSwitch createInstance(Display display) {
final Context uiContext = mContext.createWindowContext(display,
TYPE_ACCESSIBILITY_MAGNIFICATION_OVERLAY, /* options */ null);
return new MagnificationModeSwitch(uiContext, mSwitchListener);
}
}
}
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