| /* |
| * 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.dragndrop; |
| |
| import static com.android.launcher3.LauncherState.NORMAL; |
| import static com.android.launcher3.states.RotationHelper.REQUEST_LOCK; |
| import static com.android.launcher3.states.RotationHelper.REQUEST_NONE; |
| |
| import android.content.ClipDescription; |
| import android.content.Intent; |
| import android.graphics.Point; |
| import android.graphics.Rect; |
| import android.os.Handler; |
| import android.os.Looper; |
| import android.os.SystemClock; |
| import android.util.Log; |
| import android.view.DragEvent; |
| import android.view.View; |
| |
| import com.android.launcher3.AbstractFloatingView; |
| import com.android.launcher3.DragSource; |
| import com.android.launcher3.DropTarget.DragObject; |
| import com.android.launcher3.Launcher; |
| import com.android.launcher3.R; |
| import com.android.launcher3.states.InternalStateHandler; |
| import com.android.launcher3.widget.PendingItemDragHelper; |
| |
| import java.util.UUID; |
| |
| /** |
| * {@link DragSource} for handling drop from a different window. |
| */ |
| public abstract class BaseItemDragListener extends InternalStateHandler implements |
| View.OnDragListener, DragSource, DragOptions.PreDragCondition { |
| |
| private static final String TAG = "BaseItemDragListener"; |
| |
| private static final String MIME_TYPE_PREFIX = "com.android.launcher3.drag_and_drop/"; |
| public static final String EXTRA_PIN_ITEM_DRAG_LISTENER = "pin_item_drag_listener"; |
| |
| // Position of preview relative to the touch location |
| private final Rect mPreviewRect; |
| |
| private final int mPreviewBitmapWidth; |
| private final int mPreviewViewWidth; |
| |
| // Randomly generated id used to verify the drag event. |
| private final String mId; |
| |
| protected Launcher mLauncher; |
| private DragController mDragController; |
| private long mDragStartTime; |
| |
| public BaseItemDragListener(Rect previewRect, int previewBitmapWidth, int previewViewWidth) { |
| mPreviewRect = previewRect; |
| mPreviewBitmapWidth = previewBitmapWidth; |
| mPreviewViewWidth = previewViewWidth; |
| mId = UUID.randomUUID().toString(); |
| } |
| |
| public String getMimeType() { |
| return MIME_TYPE_PREFIX + mId; |
| } |
| |
| @Override |
| public boolean init(Launcher launcher, boolean alreadyOnHome) { |
| AbstractFloatingView.closeAllOpenViews(launcher, alreadyOnHome); |
| launcher.getStateManager().goToState(NORMAL, alreadyOnHome /* animated */); |
| launcher.getDragLayer().setOnDragListener(this); |
| launcher.getRotationHelper().setStateHandlerRequest(REQUEST_LOCK); |
| |
| mLauncher = launcher; |
| mDragController = launcher.getDragController(); |
| return false; |
| } |
| |
| @Override |
| public boolean onDrag(View view, DragEvent event) { |
| if (mLauncher == null || mDragController == null) { |
| postCleanup(); |
| return false; |
| } |
| if (event.getAction() == DragEvent.ACTION_DRAG_STARTED) { |
| if (onDragStart(event)) { |
| return true; |
| } else { |
| postCleanup(); |
| return false; |
| } |
| } |
| return mDragController.onDragEvent(mDragStartTime, event); |
| } |
| |
| protected boolean onDragStart(DragEvent event) { |
| ClipDescription desc = event.getClipDescription(); |
| if (desc == null || !desc.hasMimeType(getMimeType())) { |
| Log.e(TAG, "Someone started a dragAndDrop before us."); |
| return false; |
| } |
| |
| Point downPos = new Point((int) event.getX(), (int) event.getY()); |
| DragOptions options = new DragOptions(); |
| options.systemDndStartPoint = downPos; |
| options.preDragCondition = this; |
| |
| // We use drag event position as the screenPos for the preview image. Since mPreviewRect |
| // already includes the view position relative to the drag event on the source window, |
| // and the absolute position (position relative to the screen) of drag event is same |
| // across windows, using drag position here give a good estimate for relative position |
| // to source window. |
| createDragHelper().startDrag(new Rect(mPreviewRect), |
| mPreviewBitmapWidth, mPreviewViewWidth, downPos, this, options); |
| mDragStartTime = SystemClock.uptimeMillis(); |
| return true; |
| } |
| |
| protected abstract PendingItemDragHelper createDragHelper(); |
| |
| @Override |
| public boolean shouldStartDrag(double distanceDragged) { |
| // Stay in pre-drag mode, if workspace is locked. |
| return !mLauncher.isWorkspaceLocked(); |
| } |
| |
| @Override |
| public void onPreDragStart(DragObject dragObject) { |
| // The predrag starts when the workspace is not yet loaded. In some cases we set |
| // the dragLayer alpha to 0 to have a nice fade-in animation. But that will prevent the |
| // dragView from being visible. Instead just skip the fade-in animation here. |
| mLauncher.getDragLayer().setAlpha(1); |
| |
| dragObject.dragView.setColor( |
| mLauncher.getResources().getColor(R.color.delete_target_hover_tint)); |
| } |
| |
| @Override |
| public void onPreDragEnd(DragObject dragObject, boolean dragStarted) { |
| if (dragStarted) { |
| dragObject.dragView.setColor(0); |
| } |
| } |
| |
| @Override |
| public void onDropCompleted(View target, DragObject d, boolean success) { |
| postCleanup(); |
| } |
| |
| protected void postCleanup() { |
| clearReference(); |
| if (mLauncher != null) { |
| // Remove any drag params from the launcher intent since the drag operation is complete. |
| Intent newIntent = new Intent(mLauncher.getIntent()); |
| newIntent.removeExtra(EXTRA_PIN_ITEM_DRAG_LISTENER); |
| mLauncher.setIntent(newIntent); |
| } |
| |
| new Handler(Looper.getMainLooper()).post(this::removeListener); |
| } |
| |
| public void removeListener() { |
| if (mLauncher != null) { |
| mLauncher.getRotationHelper().setStateHandlerRequest(REQUEST_NONE); |
| mLauncher.getDragLayer().setOnDragListener(null); |
| } |
| } |
| } |