| /* |
| * Copyright (C) 2017 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.server.am; |
| |
| import android.annotation.IntDef; |
| import android.app.ActivityOptions; |
| import android.content.pm.ActivityInfo.WindowLayout; |
| import android.graphics.Rect; |
| |
| import java.lang.annotation.Retention; |
| import java.lang.annotation.RetentionPolicy; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import static com.android.server.am.LaunchingBoundsController.LaunchingBoundsPositioner.RESULT_CONTINUE; |
| import static com.android.server.am.LaunchingBoundsController.LaunchingBoundsPositioner.RESULT_DONE; |
| import static com.android.server.am.LaunchingBoundsController.LaunchingBoundsPositioner.RESULT_SKIP; |
| |
| /** |
| * {@link LaunchingBoundsController} calculates the launch bounds by coordinating between registered |
| * {@link LaunchingBoundsPositioner}. |
| */ |
| class LaunchingBoundsController { |
| private final List<LaunchingBoundsPositioner> mPositioners = new ArrayList<>(); |
| |
| // Temporary {@link Rect} for calculations. This is kept separate from {@code mTmpCurrent} and |
| // {@code mTmpResult} to prevent clobbering values. |
| private final Rect mTmpRect = new Rect(); |
| |
| private final Rect mTmpCurrent = new Rect(); |
| private final Rect mTmpResult = new Rect(); |
| |
| /** |
| * Creates a {@link LaunchingBoundsController} with default registered |
| * {@link LaunchingBoundsPositioner}s. |
| */ |
| void registerDefaultPositioners(ActivityStackSupervisor supervisor) { |
| // {@link LaunchingTaskPositioner} handles window layout preferences. |
| registerPositioner(new LaunchingTaskPositioner()); |
| |
| // {@link LaunchingActivityPositioner} is the most specific positioner and thus should be |
| // registered last (applied first) out of the defaults. |
| registerPositioner(new LaunchingActivityPositioner(supervisor)); |
| } |
| |
| /** |
| * Returns the position calculated by the registered positioners |
| * @param task The {@link TaskRecord} currently being positioned. |
| * @param layout The specified {@link WindowLayout}. |
| * @param activity The {@link ActivityRecord} currently being positioned. |
| * @param source The {@link ActivityRecord} from which activity was started from. |
| * @param options The {@link ActivityOptions} specified for the activity. |
| * @param result The resulting bounds. If no bounds are set, {@link Rect#isEmpty()} will be |
| * {@code true}. |
| */ |
| void calculateBounds(TaskRecord task, WindowLayout layout, ActivityRecord activity, |
| ActivityRecord source, ActivityOptions options, Rect result) { |
| result.setEmpty(); |
| |
| // We start at the last registered {@link LaunchingBoundsPositioner} as this represents |
| // The positioner closest to the product level. Moving back through the list moves closer to |
| // the platform logic. |
| for (int i = mPositioners.size() - 1; i >= 0; --i) { |
| mTmpResult.setEmpty(); |
| mTmpCurrent.set(result); |
| final LaunchingBoundsPositioner positioner = mPositioners.get(i); |
| |
| switch(positioner.onCalculateBounds(task, layout, activity, source, options, |
| mTmpCurrent, mTmpResult)) { |
| case RESULT_SKIP: |
| // Do not apply any results when we are told to skip |
| continue; |
| case RESULT_DONE: |
| // Set result and return immediately. |
| result.set(mTmpResult); |
| return; |
| case RESULT_CONTINUE: |
| // Set result and continue |
| result.set(mTmpResult); |
| break; |
| } |
| } |
| } |
| |
| /** |
| * A convenience method for laying out a task. |
| * @return {@code true} if bounds were set on the task. {@code false} otherwise. |
| */ |
| boolean layoutTask(TaskRecord task, WindowLayout layout) { |
| return layoutTask(task, layout, null /*activity*/, null /*source*/, null /*options*/); |
| } |
| |
| boolean layoutTask(TaskRecord task, WindowLayout layout, ActivityRecord activity, |
| ActivityRecord source, ActivityOptions options) { |
| calculateBounds(task, layout, activity, source, options, mTmpRect); |
| |
| if (mTmpRect.isEmpty()) { |
| return false; |
| } |
| |
| task.updateOverrideConfiguration(mTmpRect); |
| |
| return true; |
| } |
| |
| /** |
| * Adds a positioner to participate in future bounds calculation. Note that the last registered |
| * {@link LaunchingBoundsPositioner} will be the first to calculate the bounds. |
| */ |
| void registerPositioner(LaunchingBoundsPositioner positioner) { |
| if (mPositioners.contains(positioner)) { |
| return; |
| } |
| |
| mPositioners.add(positioner); |
| } |
| |
| /** |
| * An interface implemented by those wanting to participate in bounds calculation. |
| */ |
| interface LaunchingBoundsPositioner { |
| @Retention(RetentionPolicy.SOURCE) |
| @IntDef({RESULT_SKIP, RESULT_DONE, RESULT_CONTINUE}) |
| @interface Result {} |
| |
| // Returned when the positioner does not want to influence the bounds calculation |
| int RESULT_SKIP = 0; |
| // Returned when the positioner has changed the bounds and would like its results to be the |
| // final bounds applied. |
| int RESULT_DONE = 1; |
| // Returned when the positioner has changed the bounds but is okay with other positioners |
| // influencing the bounds. |
| int RESULT_CONTINUE = 2; |
| |
| /** |
| * Called when asked to calculate bounds. |
| * @param task The {@link TaskRecord} currently being positioned. |
| * @param layout The specified {@link WindowLayout}. |
| * @param activity The {@link ActivityRecord} currently being positioned. |
| * @param source The {@link ActivityRecord} activity was started from. |
| * @param options The {@link ActivityOptions} specified for the activity. |
| * @param current The current bounds. This can differ from the initial bounds as it |
| * represents the modified bounds up to this point. |
| * @param result The {@link Rect} which the positioner should return its modified bounds. |
| * Any merging of the current bounds should be already applied to this |
| * value as well before returning. |
| * @return A {@link Result} representing the result of the bounds calculation. |
| */ |
| @Result |
| int onCalculateBounds(TaskRecord task, WindowLayout layout, ActivityRecord activity, |
| ActivityRecord source, ActivityOptions options, Rect current, Rect result); |
| } |
| } |