1 /* 2 * Copyright (C) 2016 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 17 package com.android.documentsui; 18 19 import com.android.documentsui.DragAndDropManager.State; 20 21 import android.content.Context; 22 import android.graphics.Canvas; 23 import android.graphics.Color; 24 import android.graphics.Paint; 25 import android.graphics.Point; 26 import android.graphics.Rect; 27 import android.graphics.drawable.Drawable; 28 import android.view.LayoutInflater; 29 import android.view.View; 30 import android.widget.TextView; 31 32 class DragShadowBuilder extends View.DragShadowBuilder { 33 34 private final View mShadowView; 35 private final TextView mTitle; 36 private final DropBadgeView mIcon; 37 private final int mWidth; 38 private final int mHeight; 39 private final int mShadowRadius; 40 private int mPadding; 41 private Paint paint; 42 DragShadowBuilder(Context context)43 DragShadowBuilder(Context context) { 44 mWidth = context.getResources().getDimensionPixelSize(R.dimen.drag_shadow_width); 45 mHeight = context.getResources().getDimensionPixelSize(R.dimen.drag_shadow_height); 46 mShadowRadius = context.getResources().getDimensionPixelSize(R.dimen.drag_shadow_radius); 47 mPadding = context.getResources().getDimensionPixelSize(R.dimen.drag_shadow_padding); 48 49 mShadowView = LayoutInflater.from(context).inflate(R.layout.drag_shadow_layout, null); 50 mTitle = (TextView) mShadowView.findViewById(android.R.id.title); 51 mIcon = (DropBadgeView) mShadowView.findViewById(android.R.id.icon); 52 53 // Important for certain APIs 54 mShadowView.setLayerType(View.LAYER_TYPE_SOFTWARE, paint); 55 paint = new Paint(Paint.ANTI_ALIAS_FLAG); 56 } 57 58 @Override onProvideShadowMetrics( Point shadowSize, Point shadowTouchPoint)59 public void onProvideShadowMetrics( 60 Point shadowSize, Point shadowTouchPoint) { 61 shadowSize.set(mWidth, mHeight); 62 shadowTouchPoint.set(mWidth, mHeight); 63 } 64 65 @Override onDrawShadow(Canvas canvas)66 public void onDrawShadow(Canvas canvas) { 67 Rect r = canvas.getClipBounds(); 68 // Calling measure is necessary in order for all child views to get correctly laid out. 69 mShadowView.measure( 70 View.MeasureSpec.makeMeasureSpec(r.right- r.left, View.MeasureSpec.EXACTLY), 71 View.MeasureSpec.makeMeasureSpec(r.bottom - r.top , View.MeasureSpec.EXACTLY)); 72 mShadowView.layout(r.left, r.top, r.right, r.bottom); 73 74 // Since DragShadow is not an actual view drawn in hardware-accelerated window, 75 // android:elevation does not work; we need to draw the shadow ourselves manually. 76 paint.setColor(Color.TRANSPARENT); 77 // Shadow 1 78 int opacity = (int) (255 * 0.1); 79 paint.setShadowLayer(mShadowRadius, 0, 0, Color.argb(opacity, 0, 0, 0)); 80 canvas.drawRect(r.left + mPadding, r.top + mPadding, r.right - mPadding, 81 r.bottom - mPadding, paint); 82 // Shadow 2 83 opacity = (int) (255 * 0.24); 84 paint.setShadowLayer(mShadowRadius, 0, mShadowRadius, Color.argb(opacity, 0, 0, 0)); 85 canvas.drawRect(r.left + mPadding, r.top + mPadding, r.right - mPadding, 86 r.bottom - mPadding, paint); 87 mShadowView.draw(canvas); 88 } 89 updateTitle(String title)90 void updateTitle(String title) { 91 mTitle.setText(title); 92 } 93 updateIcon(Drawable icon)94 void updateIcon(Drawable icon) { 95 mIcon.updateIcon(icon); 96 } 97 onStateUpdated(@tate int state)98 void onStateUpdated(@State int state) { 99 mIcon.updateState(state); 100 } 101 } 102