| /* |
| * 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 android.app.WindowConfiguration.WINDOWING_MODE_UNDEFINED; |
| import static android.view.Display.INVALID_DISPLAY; |
| |
| import static com.android.server.am.LaunchParamsController.LaunchParamsModifier.RESULT_CONTINUE; |
| import static com.android.server.am.LaunchParamsController.LaunchParamsModifier.RESULT_DONE; |
| import static com.android.server.am.LaunchParamsController.LaunchParamsModifier.RESULT_SKIP; |
| |
| /** |
| * {@link LaunchParamsController} calculates the {@link LaunchParams} by coordinating between |
| * registered {@link LaunchParamsModifier}s. |
| */ |
| class LaunchParamsController { |
| private final ActivityManagerService mService; |
| private final List<LaunchParamsModifier> mModifiers = new ArrayList<>(); |
| |
| // Temporary {@link LaunchParams} for internal calculations. This is kept separate from |
| // {@code mTmpCurrent} and {@code mTmpResult} to prevent clobbering values. |
| private final LaunchParams mTmpParams = new LaunchParams(); |
| |
| private final LaunchParams mTmpCurrent = new LaunchParams(); |
| private final LaunchParams mTmpResult = new LaunchParams(); |
| |
| LaunchParamsController(ActivityManagerService service) { |
| mService = service; |
| } |
| |
| /** |
| * Creates a {@link LaunchParamsController} with default registered |
| * {@link LaunchParamsModifier}s. |
| */ |
| void registerDefaultModifiers(ActivityStackSupervisor supervisor) { |
| // {@link TaskLaunchParamsModifier} handles window layout preferences. |
| registerModifier(new TaskLaunchParamsModifier()); |
| |
| // {@link ActivityLaunchParamsModifier} is the most specific modifier and thus should be |
| // registered last (applied first) out of the defaults. |
| registerModifier(new ActivityLaunchParamsModifier(supervisor)); |
| } |
| |
| /** |
| * Returns the {@link LaunchParams} calculated by the registered modifiers |
| * @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 params. |
| */ |
| void calculate(TaskRecord task, WindowLayout layout, ActivityRecord activity, |
| ActivityRecord source, ActivityOptions options, LaunchParams result) { |
| result.reset(); |
| |
| // We start at the last registered {@link LaunchParamsModifier} as this represents |
| // The modifier closest to the product level. Moving back through the list moves closer to |
| // the platform logic. |
| for (int i = mModifiers.size() - 1; i >= 0; --i) { |
| mTmpCurrent.set(result); |
| mTmpResult.reset(); |
| final LaunchParamsModifier modifier = mModifiers.get(i); |
| |
| switch(modifier.onCalculate(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) { |
| calculate(task, layout, activity, source, options, mTmpParams); |
| |
| // No changes, return. |
| if (mTmpParams.isEmpty()) { |
| return false; |
| } |
| |
| mService.mWindowManager.deferSurfaceLayout(); |
| |
| try { |
| if (mTmpParams.hasPreferredDisplay() |
| && mTmpParams.mPreferredDisplayId != task.getStack().getDisplay().mDisplayId) { |
| mService.mActivityTaskManager.moveStackToDisplay(task.getStackId(), mTmpParams.mPreferredDisplayId); |
| } |
| |
| if (mTmpParams.hasWindowingMode() |
| && mTmpParams.mWindowingMode != task.getStack().getWindowingMode()) { |
| task.getStack().setWindowingMode(mTmpParams.mWindowingMode); |
| } |
| |
| if (!mTmpParams.mBounds.isEmpty()) { |
| task.updateOverrideConfiguration(mTmpParams.mBounds); |
| return true; |
| } else { |
| return false; |
| } |
| } finally { |
| mService.mWindowManager.continueSurfaceLayout(); |
| } |
| } |
| |
| /** |
| * Adds a modifier to participate in future bounds calculation. Note that the last registered |
| * {@link LaunchParamsModifier} will be the first to calculate the bounds. |
| */ |
| void registerModifier(LaunchParamsModifier modifier) { |
| if (mModifiers.contains(modifier)) { |
| return; |
| } |
| |
| mModifiers.add(modifier); |
| } |
| |
| /** |
| * A container for holding launch related fields. |
| */ |
| static class LaunchParams { |
| /** The bounds within the parent container. */ |
| final Rect mBounds = new Rect(); |
| |
| /** The id of the display the {@link TaskRecord} would prefer to be on. */ |
| int mPreferredDisplayId; |
| |
| /** The windowing mode to be in. */ |
| int mWindowingMode; |
| |
| /** Sets values back to default. {@link #isEmpty} will return {@code true} once called. */ |
| void reset() { |
| mBounds.setEmpty(); |
| mPreferredDisplayId = INVALID_DISPLAY; |
| mWindowingMode = WINDOWING_MODE_UNDEFINED; |
| } |
| |
| /** Copies the values set on the passed in {@link LaunchParams}. */ |
| void set(LaunchParams params) { |
| mBounds.set(params.mBounds); |
| mPreferredDisplayId = params.mPreferredDisplayId; |
| mWindowingMode = params.mWindowingMode; |
| } |
| |
| /** Returns {@code true} if no values have been explicitly set. */ |
| boolean isEmpty() { |
| return mBounds.isEmpty() && mPreferredDisplayId == INVALID_DISPLAY |
| && mWindowingMode == WINDOWING_MODE_UNDEFINED; |
| } |
| |
| boolean hasWindowingMode() { |
| return mWindowingMode != WINDOWING_MODE_UNDEFINED; |
| } |
| |
| boolean hasPreferredDisplay() { |
| return mPreferredDisplayId != INVALID_DISPLAY; |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) return true; |
| if (o == null || getClass() != o.getClass()) return false; |
| |
| LaunchParams that = (LaunchParams) o; |
| |
| if (mPreferredDisplayId != that.mPreferredDisplayId) return false; |
| if (mWindowingMode != that.mWindowingMode) return false; |
| return mBounds != null ? mBounds.equals(that.mBounds) : that.mBounds == null; |
| } |
| |
| @Override |
| public int hashCode() { |
| int result = mBounds != null ? mBounds.hashCode() : 0; |
| result = 31 * result + mPreferredDisplayId; |
| result = 31 * result + mWindowingMode; |
| return result; |
| } |
| } |
| |
| /** |
| * An interface implemented by those wanting to participate in bounds calculation. |
| */ |
| interface LaunchParamsModifier { |
| @Retention(RetentionPolicy.SOURCE) |
| @IntDef({RESULT_SKIP, RESULT_DONE, RESULT_CONTINUE}) |
| @interface Result {} |
| |
| // Returned when the modifier does not want to influence the bounds calculation |
| int RESULT_SKIP = 0; |
| // Returned when the modifier has changed the bounds and would like its results to be the |
| // final bounds applied. |
| int RESULT_DONE = 1; |
| // Returned when the modifier has changed the bounds but is okay with other modifiers |
| // influencing the bounds. |
| int RESULT_CONTINUE = 2; |
| |
| /** |
| * Called when asked to calculate {@link LaunchParams}. |
| * @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 currentParams The current {@link LaunchParams}. This can differ from the initial |
| * params as it represents the modified params up to this point. |
| * @param outParams The resulting {@link LaunchParams} after all calculations. |
| * @return A {@link Result} representing the result of the |
| * {@link LaunchParams} calculation. |
| */ |
| @Result |
| int onCalculate(TaskRecord task, WindowLayout layout, ActivityRecord activity, |
| ActivityRecord source, ActivityOptions options, LaunchParams currentParams, |
| LaunchParams outParams); |
| } |
| } |