1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 package com.android.launcher3.states; 17 18 import static com.android.launcher3.Flags.enableScalingRevealHomeAnimation; 19 import static com.android.launcher3.logging.StatsLogManager.LAUNCHER_STATE_HOME; 20 21 import android.content.Context; 22 23 import com.android.launcher3.DeviceProfile; 24 import com.android.launcher3.Launcher; 25 import com.android.launcher3.LauncherState; 26 import com.android.launcher3.Workspace; 27 28 /** 29 * Definition for spring loaded state used during drag and drop. 30 */ 31 public class SpringLoadedState extends LauncherState { 32 33 private static final int STATE_FLAGS = FLAG_MULTI_PAGE 34 | FLAG_WORKSPACE_INACCESSIBLE | FLAG_DISABLE_RESTORE 35 | FLAG_WORKSPACE_ICONS_CAN_BE_DRAGGED | FLAG_WORKSPACE_HAS_BACKGROUNDS; 36 37 public static final float DEPTH_15_PERCENT = 0.15f; 38 SpringLoadedState(int id)39 public SpringLoadedState(int id) { 40 super(id, LAUNCHER_STATE_HOME, STATE_FLAGS); 41 } 42 43 @Override getTransitionDuration(Context context, boolean isToState)44 public int getTransitionDuration(Context context, boolean isToState) { 45 return 150; 46 } 47 48 @Override getWorkspaceScaleAndTranslation(Launcher launcher)49 public ScaleAndTranslation getWorkspaceScaleAndTranslation(Launcher launcher) { 50 DeviceProfile grid = launcher.getDeviceProfile(); 51 Workspace<?> ws = launcher.getWorkspace(); 52 if (ws.getChildCount() == 0) { 53 return super.getWorkspaceScaleAndTranslation(launcher); 54 } 55 56 float shrunkTop = grid.getCellLayoutSpringLoadShrunkTop(); 57 float scale = grid.getWorkspaceSpringLoadScale(launcher); 58 59 float halfHeight = ws.getHeight() / 2; 60 float myCenter = ws.getTop() + halfHeight; 61 float cellTopFromCenter = halfHeight - ws.getChildAt(0).getTop(); 62 float actualCellTop = myCenter - cellTopFromCenter * scale; 63 return new ScaleAndTranslation(scale, 0, shrunkTop - actualCellTop); 64 } 65 66 @Override getDepthUnchecked(Context context)67 protected float getDepthUnchecked(Context context) { 68 if (enableScalingRevealHomeAnimation()) { 69 return DEPTH_15_PERCENT; 70 } else { 71 return 0.5f; 72 } 73 } 74 75 @Override getHotseatScaleAndTranslation(Launcher launcher)76 public ScaleAndTranslation getHotseatScaleAndTranslation(Launcher launcher) { 77 return new ScaleAndTranslation(1, 0, 0); 78 } 79 80 @Override getWorkspaceBackgroundAlpha(Launcher launcher)81 public float getWorkspaceBackgroundAlpha(Launcher launcher) { 82 return 0.2f; 83 } 84 } 85