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 static com.android.documentsui.util.FlagUtils.isUseMaterial3FlagEnabled; 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 import androidx.annotation.Nullable; 33 34 import com.android.documentsui.DragAndDropManager.State; 35 36 import java.text.NumberFormat; 37 38 class DragShadowBuilder extends View.DragShadowBuilder { 39 40 private final View mShadowView; 41 private final TextView mTitle; 42 private final DropBadgeView mIcon; 43 private final int mWidth; 44 private final int mHeight; 45 private final int mShadowRadius; 46 private final int mPadding; 47 private Paint paint; 48 // This will be null if use_material3 flag is OFF. 49 private final @Nullable View mAdditionalShadowView; 50 // This will always be 0 if the use_material3 flag is OFF. 51 private int mDragFileCount = 0; 52 // The following 5 dimensions will be 0 if the use_material3 flag is OFF. 53 private final int mDragContentRadius; 54 private final int mAdditionalLayerOffset; 55 private final int mDragFileCounterOffset; 56 private final int mShadow2Radius; 57 private final int mShadowYOffset; 58 DragShadowBuilder(Context context)59 DragShadowBuilder(Context context) { 60 mWidth = context.getResources().getDimensionPixelSize(R.dimen.drag_shadow_width); 61 mHeight = context.getResources().getDimensionPixelSize(R.dimen.drag_shadow_height); 62 mShadowRadius = context.getResources().getDimensionPixelSize(R.dimen.drag_shadow_radius); 63 mPadding = context.getResources().getDimensionPixelSize(R.dimen.drag_shadow_padding); 64 65 mShadowView = LayoutInflater.from(context).inflate(R.layout.drag_shadow_layout, null); 66 mTitle = (TextView) mShadowView.findViewById(android.R.id.title); 67 mIcon = (DropBadgeView) mShadowView.findViewById(android.R.id.icon); 68 if (isUseMaterial3FlagEnabled()) { 69 mAdditionalShadowView = 70 LayoutInflater.from(context).inflate(R.layout.additional_drag_shadow, null); 71 mDragContentRadius = 72 context.getResources().getDimensionPixelSize(R.dimen.drag_content_radius); 73 mAdditionalLayerOffset = 74 context.getResources() 75 .getDimensionPixelSize(R.dimen.drag_additional_layer_offset); 76 mDragFileCounterOffset = 77 context.getResources().getDimensionPixelSize(R.dimen.drag_file_counter_offset); 78 mShadow2Radius = 79 context.getResources().getDimensionPixelSize(R.dimen.drag_shadow_2_radius); 80 mShadowYOffset = 81 context.getResources().getDimensionPixelSize(R.dimen.drag_shadow_y_offset); 82 } else { 83 mAdditionalShadowView = null; 84 mDragContentRadius = 0; 85 mAdditionalLayerOffset = 0; 86 mDragFileCounterOffset = 0; 87 mShadow2Radius = 0; 88 mShadowYOffset = 0; 89 } 90 91 // Important for certain APIs 92 mShadowView.setLayerType(View.LAYER_TYPE_SOFTWARE, paint); 93 paint = new Paint(Paint.ANTI_ALIAS_FLAG); 94 } 95 96 @Override onProvideShadowMetrics( Point shadowSize, Point shadowTouchPoint)97 public void onProvideShadowMetrics( 98 Point shadowSize, Point shadowTouchPoint) { 99 shadowSize.set(mWidth, mHeight); 100 shadowTouchPoint.set(mWidth, mHeight); 101 } 102 103 @Override onDrawShadow(Canvas canvas)104 public void onDrawShadow(Canvas canvas) { 105 Rect r = canvas.getClipBounds(); 106 // Calling measure is necessary in order for all child views to get correctly laid out. 107 mShadowView.measure( 108 View.MeasureSpec.makeMeasureSpec(r.right - r.left, View.MeasureSpec.EXACTLY), 109 View.MeasureSpec.makeMeasureSpec(r.bottom - r.top , View.MeasureSpec.EXACTLY)); 110 mShadowView.layout(r.left, r.top, r.right, r.bottom); 111 112 // Since DragShadow is not an actual view drawn in hardware-accelerated window, 113 // android:elevation does not work; we need to draw the shadow ourselves manually. 114 paint.setColor(Color.TRANSPARENT); 115 116 // Layers on the canvas (from bottom to top): 117 // 1. Two shadows for the additional drag layer (if drag file count > 1) 118 // 2. The additional layer view itself (if drag file count > 1) 119 // 3. Two shadows for the drag content layer (icon, title) 120 // 4. The drag content layer itself 121 final int shadowOneOpacity = (int) (255 * 0.15); 122 final int shadowTwoOpacity = (int) (255 * 0.30); 123 if (mAdditionalShadowView != null && mDragFileCount > 1) { 124 mAdditionalShadowView.measure( 125 View.MeasureSpec.makeMeasureSpec(r.right - r.left, View.MeasureSpec.EXACTLY), 126 View.MeasureSpec.makeMeasureSpec(r.bottom - r.top , View.MeasureSpec.EXACTLY)); 127 mAdditionalShadowView.layout(r.left, r.top, r.right, r.bottom); 128 // Shadow 1 129 paint.setShadowLayer( 130 mShadowRadius, 0, mShadowYOffset, Color.argb(shadowOneOpacity, 0, 0, 0)); 131 canvas.drawRoundRect( 132 r.left + mShadowRadius, 133 r.top + mDragFileCounterOffset + mAdditionalLayerOffset, 134 r.right - mDragFileCounterOffset - mAdditionalLayerOffset, 135 r.bottom - mShadowRadius, 136 mDragContentRadius, 137 mDragContentRadius, 138 paint); 139 // Shadow 2 140 paint.setShadowLayer( 141 mShadow2Radius, 0, mShadowYOffset, Color.argb(shadowTwoOpacity, 0, 0, 0)); 142 canvas.drawRoundRect( 143 r.left + mShadowRadius, 144 r.top + mDragFileCounterOffset + mAdditionalLayerOffset, 145 r.right - mDragFileCounterOffset - mAdditionalLayerOffset, 146 r.bottom - mShadowRadius, 147 mDragContentRadius, 148 mDragContentRadius, 149 paint); 150 mAdditionalShadowView.draw(canvas); 151 } 152 153 if (isUseMaterial3FlagEnabled()) { 154 // Shadow 1 155 paint.setShadowLayer( 156 mShadowRadius, 0, mShadowYOffset, Color.argb(shadowOneOpacity, 0, 0, 0)); 157 canvas.drawRoundRect( 158 r.left + mShadowRadius + mAdditionalLayerOffset, 159 r.top + mDragFileCounterOffset, 160 r.right - mDragFileCounterOffset, 161 r.bottom - mShadowRadius - mAdditionalLayerOffset, 162 mDragContentRadius, 163 mDragContentRadius, 164 paint); 165 // Shadow 2 166 paint.setShadowLayer( 167 mShadow2Radius, 0, mShadowYOffset, Color.argb(shadowTwoOpacity, 0, 0, 0)); 168 canvas.drawRoundRect( 169 r.left + mShadowRadius + mAdditionalLayerOffset, 170 r.top + mDragFileCounterOffset, 171 r.right - mDragFileCounterOffset, 172 r.bottom - mShadowRadius - mAdditionalLayerOffset, 173 mDragContentRadius, 174 mDragContentRadius, 175 paint); 176 } else { 177 // Shadow 1 178 int opacity = (int) (255 * 0.1); 179 paint.setShadowLayer(mShadowRadius, 0, 0, Color.argb(opacity, 0, 0, 0)); 180 canvas.drawRect(r.left + mPadding, r.top + mPadding, r.right - mPadding, 181 r.bottom - mPadding, paint); 182 // Shadow 2 183 opacity = (int) (255 * 0.24); 184 paint.setShadowLayer(mShadowRadius, 0, mShadowRadius, Color.argb(opacity, 0, 0, 0)); 185 canvas.drawRect(r.left + mPadding, r.top + mPadding, r.right - mPadding, 186 r.bottom - mPadding, paint); 187 } 188 mShadowView.draw(canvas); 189 } 190 updateTitle(String title)191 void updateTitle(String title) { 192 mTitle.setText(title); 193 } 194 updateIcon(Drawable icon)195 void updateIcon(Drawable icon) { 196 mIcon.updateIcon(icon); 197 } 198 onStateUpdated(@tate int state)199 void onStateUpdated(@State int state) { 200 mIcon.updateState(state); 201 } 202 updateDragFileCount(int count)203 void updateDragFileCount(int count) { 204 if (!isUseMaterial3FlagEnabled()) { 205 return; 206 } 207 mDragFileCount = count; 208 TextView dragFileCountView = mShadowView.findViewById(R.id.drag_file_counter); 209 if (dragFileCountView != null) { 210 dragFileCountView.setVisibility(count > 1 ? View.VISIBLE : View.GONE); 211 if (count > 1) { 212 NumberFormat numberFormat = NumberFormat.getInstance(); 213 dragFileCountView.setText(numberFormat.format(count)); 214 } 215 } 216 } 217 } 218