content: /*
   * 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.launcher3.states;
  
  import static com.android.launcher3.LauncherAnimUtils.SPRING_LOADED_TRANSITION_MS;
  import static com.android.launcher3.states.RotationHelper.REQUEST_LOCK;
  
  import android.graphics.Rect;
  
  import com.android.launcher3.DeviceProfile;
  import com.android.launcher3.InstallShortcutReceiver;
  import com.android.launcher3.Launcher;
  import com.android.launcher3.LauncherState;
  import com.android.launcher3.Workspace;
  import com.android.launcher3.userevent.nano.LauncherLogProto.ContainerType;
  
  /**
   * Definition for spring loaded state used during drag and drop.
   */
  public class SpringLoadedState extends LauncherState {
  
      private static final int STATE_FLAGS = FLAG_MULTI_PAGE |
              FLAG_DISABLE_ACCESSIBILITY | FLAG_DISABLE_RESTORE | FLAG_WORKSPACE_ICONS_CAN_BE_DRAGGED |
              FLAG_DISABLE_PAGE_CLIPPING | FLAG_PAGE_BACKGROUNDS | FLAG_HIDE_BACK_BUTTON;
  
      public SpringLoadedState(int id) {
          super(id, ContainerType.OVERVIEW, SPRING_LOADED_TRANSITION_MS, STATE_FLAGS);
      }
  
      @Override
      public ScaleAndTranslation getWorkspaceScaleAndTranslation(Launcher launcher) {
          DeviceProfile grid = launcher.getDeviceProfile();
          Workspace ws = launcher.getWorkspace();
          if (ws.getChildCount() == 0) {
              return super.getWorkspaceScaleAndTranslation(launcher);
          }
  
          if (grid.isVerticalBarLayout()) {
              float scale = grid.workspaceSpringLoadShrinkFactor;
              return new ScaleAndTranslation(scale, 0, 0);
          }
  
          float scale = grid.workspaceSpringLoadShrinkFactor;
          Rect insets = launcher.getDragLayer().getInsets();
  
          float scaledHeight = scale * ws.getNormalChildHeight();
          float shrunkTop = insets.top + grid.dropTargetBarSizePx;
          float shrunkBottom = ws.getMeasuredHeight() - insets.bottom
                  - grid.workspacePadding.bottom
                  - grid.workspaceSpringLoadedBottomSpace;
          float totalShrunkSpace = shrunkBottom - shrunkTop;
  
          float desiredCellTop = shrunkTop + (totalShrunkSpace - scaledHeight) / 2;
  
          float halfHeight = ws.getHeight() / 2;
          float myCenter = ws.getTop() + halfHeight;
          float cellTopFromCenter = halfHeight - ws.getChildAt(0).getTop();
          float actualCellTop = myCenter - cellTopFromCenter * scale;
          return new ScaleAndTranslation(scale, 0, (desiredCellTop - actualCellTop) / scale);
      }
  
      @Override
      public ScaleAndTranslation getHotseatScaleAndTranslation(Launcher launcher) {
          return new ScaleAndTranslation(1, 0, 0);
      }
  
      @Override
      public void onStateEnabled(Launcher launcher) {
          Workspace ws = launcher.getWorkspace();
          ws.showPageIndicatorAtCurrentScroll();
          ws.getPageIndicator().setShouldAutoHide(false);
  
          // Prevent any Un/InstallShortcutReceivers from updating the db while we are
          // in spring loaded mode
          InstallShortcutReceiver.enableInstallQueue(InstallShortcutReceiver.FLAG_DRAG_AND_DROP);
          launcher.getRotationHelper().setCurrentStateRequest(REQUEST_LOCK);
      }
  
      @Override
      public float getWorkspaceScrimAlpha(Launcher launcher) {
          return 0.3f;
      }
  
      @Override
      public void onStateDisabled(final Launcher launcher) {
          launcher.getWorkspace().getPageIndicator().setShouldAutoHide(true);
  
          // Re-enable any Un/InstallShortcutReceiver and now process any queued items
          InstallShortcutReceiver.disableAndFlushInstallQueue(
                  InstallShortcutReceiver.FLAG_DRAG_AND_DROP, launcher);
      }
  }
  