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.LauncherAnimUtils.SPRING_LOADED_TRANSITION_MS; 19 import static com.android.launcher3.states.RotationHelper.REQUEST_LOCK; 20 21 import android.graphics.Rect; 22 23 import com.android.launcher3.DeviceProfile; 24 import com.android.launcher3.InstallShortcutReceiver; 25 import com.android.launcher3.Launcher; 26 import com.android.launcher3.LauncherState; 27 import com.android.launcher3.Workspace; 28 import com.android.launcher3.userevent.nano.LauncherLogProto.ContainerType; 29 30 /** 31 * Definition for spring loaded state used during drag and drop. 32 */ 33 public class SpringLoadedState extends LauncherState { 34 35 private static final int STATE_FLAGS = FLAG_MULTI_PAGE | 36 FLAG_DISABLE_ACCESSIBILITY | FLAG_DISABLE_RESTORE | FLAG_WORKSPACE_ICONS_CAN_BE_DRAGGED | 37 FLAG_DISABLE_PAGE_CLIPPING | FLAG_PAGE_BACKGROUNDS | FLAG_HIDE_BACK_BUTTON; 38 SpringLoadedState(int id)39 public SpringLoadedState(int id) { 40 super(id, ContainerType.OVERVIEW, SPRING_LOADED_TRANSITION_MS, STATE_FLAGS); 41 } 42 43 @Override getWorkspaceScaleAndTranslation(Launcher launcher)44 public float[] getWorkspaceScaleAndTranslation(Launcher launcher) { 45 DeviceProfile grid = launcher.getDeviceProfile(); 46 Workspace ws = launcher.getWorkspace(); 47 if (ws.getChildCount() == 0) { 48 return super.getWorkspaceScaleAndTranslation(launcher); 49 } 50 51 if (grid.isVerticalBarLayout()) { 52 float scale = grid.workspaceSpringLoadShrinkFactor; 53 return new float[] {scale, 0, 0}; 54 } 55 56 float scale = grid.workspaceSpringLoadShrinkFactor; 57 Rect insets = launcher.getDragLayer().getInsets(); 58 59 float scaledHeight = scale * ws.getNormalChildHeight(); 60 float shrunkTop = insets.top + grid.dropTargetBarSizePx; 61 float shrunkBottom = ws.getMeasuredHeight() - insets.bottom 62 - grid.workspacePadding.bottom 63 - grid.workspaceSpringLoadedBottomSpace; 64 float totalShrunkSpace = shrunkBottom - shrunkTop; 65 66 float desiredCellTop = shrunkTop + (totalShrunkSpace - scaledHeight) / 2; 67 68 float halfHeight = ws.getHeight() / 2; 69 float myCenter = ws.getTop() + halfHeight; 70 float cellTopFromCenter = halfHeight - ws.getChildAt(0).getTop(); 71 float actualCellTop = myCenter - cellTopFromCenter * scale; 72 return new float[] { scale, 0, (desiredCellTop - actualCellTop) / scale}; 73 } 74 75 @Override onStateEnabled(Launcher launcher)76 public void onStateEnabled(Launcher launcher) { 77 Workspace ws = launcher.getWorkspace(); 78 ws.showPageIndicatorAtCurrentScroll(); 79 ws.getPageIndicator().setShouldAutoHide(false); 80 81 // Prevent any Un/InstallShortcutReceivers from updating the db while we are 82 // in spring loaded mode 83 InstallShortcutReceiver.enableInstallQueue(InstallShortcutReceiver.FLAG_DRAG_AND_DROP); 84 launcher.getRotationHelper().setCurrentStateRequest(REQUEST_LOCK); 85 } 86 87 @Override getWorkspaceScrimAlpha(Launcher launcher)88 public float getWorkspaceScrimAlpha(Launcher launcher) { 89 return 0.3f; 90 } 91 92 @Override onStateDisabled(final Launcher launcher)93 public void onStateDisabled(final Launcher launcher) { 94 launcher.getWorkspace().getPageIndicator().setShouldAutoHide(true); 95 96 // Re-enable any Un/InstallShortcutReceiver and now process any queued items 97 InstallShortcutReceiver.disableAndFlushInstallQueue( 98 InstallShortcutReceiver.FLAG_DRAG_AND_DROP, launcher); 99 } 100 } 101