| /* |
| * Copyright (C) 2016 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.documentsui; |
| |
| import android.content.Context; |
| import android.graphics.Canvas; |
| import android.graphics.Color; |
| import android.graphics.Paint; |
| import android.graphics.Point; |
| import android.graphics.Rect; |
| import android.graphics.drawable.Drawable; |
| import android.view.LayoutInflater; |
| import android.view.View; |
| import android.widget.TextView; |
| |
| import com.android.documentsui.base.DocumentInfo; |
| import com.android.documentsui.base.Shared; |
| import com.android.documentsui.dirlist.IconHelper; |
| import com.android.documentsui.dirlist.Model; |
| import com.android.documentsui.selection.Selection; |
| |
| import java.util.List; |
| import java.util.function.Function; |
| |
| public final class DragShadowBuilder extends View.DragShadowBuilder { |
| |
| private final View mShadowView; |
| private final TextView mTitle; |
| private final DropBadgeView mIcon; |
| private final int mWidth; |
| private final int mHeight; |
| private final int mShadowRadius; |
| private int mPadding; |
| private Paint paint; |
| |
| public DragShadowBuilder(Context context) { |
| mWidth = context.getResources().getDimensionPixelSize(R.dimen.drag_shadow_width); |
| mHeight = context.getResources().getDimensionPixelSize(R.dimen.drag_shadow_height); |
| mShadowRadius = context.getResources().getDimensionPixelSize(R.dimen.drag_shadow_radius); |
| mPadding = context.getResources().getDimensionPixelSize(R.dimen.drag_shadow_padding); |
| |
| mShadowView = LayoutInflater.from(context).inflate(R.layout.drag_shadow_layout, null); |
| mTitle = (TextView) mShadowView.findViewById(android.R.id.title); |
| mIcon = (DropBadgeView) mShadowView.findViewById(android.R.id.icon); |
| |
| // Important for certain APIs |
| mShadowView.setLayerType(View.LAYER_TYPE_SOFTWARE, paint); |
| paint = new Paint(Paint.ANTI_ALIAS_FLAG); |
| } |
| |
| @Override |
| public void onProvideShadowMetrics( |
| Point shadowSize, Point shadowTouchPoint) { |
| shadowSize.set(mWidth, mHeight); |
| shadowTouchPoint.set(mWidth, mHeight); |
| } |
| |
| @Override |
| public void onDrawShadow(Canvas canvas) { |
| Rect r = canvas.getClipBounds(); |
| // Calling measure is necessary in order for all child views to get correctly laid out. |
| mShadowView.measure( |
| View.MeasureSpec.makeMeasureSpec(r.right- r.left, View.MeasureSpec.EXACTLY), |
| View.MeasureSpec.makeMeasureSpec(r.bottom - r.top , View.MeasureSpec.EXACTLY)); |
| mShadowView.layout(r.left, r.top, r.right, r.bottom); |
| |
| // Since DragShadow is not an actual view drawn in hardware-accelerated window, |
| // android:elevation does not work; we need to draw the shadow ourselves manually. |
| paint.setColor(Color.TRANSPARENT); |
| // Shadow 1 |
| int opacity = (int) (255 * 0.1); |
| paint.setShadowLayer(mShadowRadius, 0, 0, Color.argb(opacity, 0, 0, 0)); |
| canvas.drawRect(r.left + mPadding, r.top + mPadding, r.right - mPadding, |
| r.bottom - mPadding, paint); |
| // Shadow 2 |
| opacity = (int) (255 * 0.24); |
| paint.setShadowLayer(mShadowRadius, 0, mShadowRadius, Color.argb(opacity, 0, 0, 0)); |
| canvas.drawRect(r.left + mPadding, r.top + mPadding, r.right - mPadding, |
| r.bottom - mPadding, paint); |
| mShadowView.draw(canvas); |
| } |
| |
| public void updateTitle(String title) { |
| mTitle.setText(title); |
| } |
| |
| public void updateIcon(Drawable icon) { |
| mIcon.updateIcon(icon); |
| } |
| |
| public void resetBackground() { |
| mIcon.setDropHovered(false); |
| mIcon.setEnabled(false); |
| } |
| |
| public void setAppearDroppable(boolean droppable) { |
| mIcon.setDropHovered(true); |
| mIcon.setDroppable(droppable); |
| } |
| |
| /** |
| * Provides a means of fully isolating the mechanics of building drag shadows (and builders) |
| * in support of testing. |
| */ |
| public static final class Updater implements Function<Selection, DragShadowBuilder> { |
| |
| private final Context mContext; |
| private final IconHelper mIconHelper; |
| private final Drawable mDefaultDragIcon; |
| private final Model mModel; |
| private final DragShadowBuilder mShadowBuilder; |
| |
| public Updater( |
| Context context, DragShadowBuilder shadowBuilder, Model model, |
| IconHelper iconHelper, Drawable defaultDragIcon) { |
| mContext = context; |
| mShadowBuilder = shadowBuilder; |
| mModel = model; |
| mIconHelper = iconHelper; |
| mDefaultDragIcon = defaultDragIcon; |
| } |
| |
| @Override |
| public DragShadowBuilder apply(Selection selection) { |
| mShadowBuilder.updateTitle(getDragTitle(selection)); |
| mShadowBuilder.updateIcon(getDragIcon(selection)); |
| |
| return mShadowBuilder; |
| } |
| |
| private Drawable getDragIcon(Selection selection) { |
| if (selection.size() == 1) { |
| DocumentInfo doc = getSingleSelectedDocument(selection); |
| return mIconHelper.getDocumentIcon(mContext, doc); |
| } |
| return mDefaultDragIcon; |
| } |
| |
| private String getDragTitle(Selection selection) { |
| assert (!selection.isEmpty()); |
| if (selection.size() == 1) { |
| DocumentInfo doc = getSingleSelectedDocument(selection); |
| return doc.displayName; |
| } |
| return Shared.getQuantityString(mContext, R.plurals.elements_dragged, selection.size()); |
| } |
| |
| private DocumentInfo getSingleSelectedDocument(Selection selection) { |
| assert (selection.size() == 1); |
| final List<DocumentInfo> docs = mModel.getDocuments(selection); |
| assert (docs.size() == 1); |
| return docs.get(0); |
| } |
| } |
| } |