app/src/main/java/com/farmerbb/taskbar/ui/DashboardController.java

   1 /* Based on code by Leonardo Fischer
   2  * See https://github.com/lgfischer/WidgetHostExample
   3  *
   4  * Copyright 2016 Braden Farmer
   5  *
   6  * Licensed under the Apache License, Version 2.0 (the "License");
   7  * you may not use this file except in compliance with the License.
   8  * You may obtain a copy of the License at
   9  *
  10  *     http://www.apache.org/licenses/LICENSE-2.0
  11  *
  12  * Unless required by applicable law or agreed to in writing, software
  13  * distributed under the License is distributed on an "AS IS" BASIS,
  14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  15  * See the License for the specific language governing permissions and
  16  * limitations under the License.
  17  */
  18
  19 package com.farmerbb.taskbar.ui;
  20
  21 import android.animation.Animator;
  22 import android.animation.AnimatorListenerAdapter;
  23 import android.annotation.SuppressLint;
  24 import android.annotation.TargetApi;
  25 import android.appwidget.AppWidgetHost;
  26 import android.appwidget.AppWidgetHostView;
  27 import android.appwidget.AppWidgetManager;
  28 import android.appwidget.AppWidgetProviderInfo;
  29 import android.content.BroadcastReceiver;
  30 import android.content.ComponentName;
  31 import android.content.Context;
  32 import android.content.Intent;
  33 import android.content.IntentFilter;
  34 import android.content.SharedPreferences;
  35 import android.content.pm.PackageManager;
  36 import android.content.res.Configuration;
  37 import android.graphics.Color;
  38 import android.graphics.ColorMatrix;
  39 import android.graphics.ColorMatrixColorFilter;
  40 import android.graphics.drawable.Drawable;
  41 import android.os.Build;
  42 import android.os.Bundle;
  43 import android.os.Handler;
  44 import android.os.Process;
  45 import android.support.v4.content.LocalBroadcastManager;
  46 import android.support.v4.graphics.ColorUtils;
  47 import android.util.SparseArray;
  48 import android.view.MotionEvent;
  49 import android.view.PointerIcon;
  50 import android.view.View;
  51 import android.view.ViewGroup;
  52 import android.view.WindowManager;
  53 import android.widget.FrameLayout;
  54 import android.widget.ImageView;
  55 import android.widget.LinearLayout;
  56 import android.widget.TextView;
  57 import android.widget.Toast;
  58
  59 import com.farmerbb.taskbar.R;
  60 import com.farmerbb.taskbar.activity.DashboardActivity;
  61 import com.farmerbb.taskbar.activity.HomeActivityDelegate;
  62 import com.farmerbb.taskbar.activity.dark.DashboardActivityDark;
  63 import com.farmerbb.taskbar.util.DashboardHelper;
  64 import com.farmerbb.taskbar.widget.DashboardCell;
  65 import com.farmerbb.taskbar.util.FreeformHackHelper;
  66 import com.farmerbb.taskbar.util.LauncherHelper;
  67 import com.farmerbb.taskbar.util.U;
  68
  69 import java.util.List;
  70
  71 public class DashboardController implements Controller {
  72
  73     private AppWidgetManager mAppWidgetManager;
  74     private AppWidgetHost mAppWidgetHost;
  75
  76     private Context context;
  77     private LinearLayout layout;
  78
  79     private SparseArray<DashboardCell> cells = new SparseArray<>();
  80     private SparseArray<AppWidgetHostView> widgets = new SparseArray<>();
  81
  82     private final int APPWIDGET_HOST_ID = 123;
  83
  84     private int columns;
  85     private int rows;
  86     private int maxSize;
  87     private int previouslySelectedCell = -1;
  88
  89     private View.OnClickListener ocl = view -> toggleDashboard();
  90
  91     private View.OnClickListener cellOcl = view -> cellClick(view, true);
  92
  93     private View.OnHoverListener cellOhl = (v, event) -> {
  94         cellClick(v, false);
  95
  96         if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.N)
  97             v.setPointerIcon(PointerIcon.getSystemIcon(context, PointerIcon.TYPE_DEFAULT));
  98
  99         return false;
 100     };
 101
 102     private View.OnLongClickListener olcl = v -> {
 103         cellLongClick(v);
 104         return true;
 105     };
 106
 107     private View.OnGenericMotionListener ogml = (view, motionEvent) -> {
 108         if(motionEvent.getAction() == MotionEvent.ACTION_BUTTON_PRESS
 109                 && motionEvent.getButtonState() == MotionEvent.BUTTON_SECONDARY)
 110             cellLongClick(view);
 111
 112         return false;
 113     };
 114
 115     private DashboardCell.OnInterceptedLongPressListener listener = this::cellLongClick;
 116
 117     private BroadcastReceiver toggleReceiver = new BroadcastReceiver() {
 118         @Override
 119         public void onReceive(Context context, Intent intent) {
 120             toggleDashboard();
 121         }
 122     };
 123
 124     private BroadcastReceiver addWidgetReceiver = new BroadcastReceiver() {
 125         @Override
 126         public void onReceive(Context context, Intent intent) {
 127             fadeIn();
 128
 129             if(intent.hasExtra("appWidgetId") && intent.hasExtra("cellId")) {
 130                 int appWidgetId = intent.getExtras().getInt("appWidgetId", -1);
 131                 int cellId = intent.getExtras().getInt("cellId", -1);
 132
 133                 addWidget(appWidgetId, cellId, true);
 134             }
 135         }
 136     };
 137
 138     private BroadcastReceiver removeWidgetReceiver = new BroadcastReceiver() {
 139         @Override
 140         public void onReceive(Context context, Intent intent) {
 141             fadeIn();
 142
 143             if(intent.hasExtra("cellId")) {
 144                 int cellId = intent.getExtras().getInt("cellId", -1);
 145
 146                 removeWidget(cellId, false);
 147             }
 148         }
 149     };
 150
 151     private BroadcastReceiver hideReceiver = new BroadcastReceiver() {
 152         @Override
 153         public void onReceive(Context context, Intent intent) {
 154             hideDashboard();
 155         }
 156     };
 157
 158     public DashboardController(Context context) {
 159         this.context = context;
 160     }
 161
 162     @TargetApi(Build.VERSION_CODES.M)
 163     @Override
 164     public void onCreateHost(Host host) {
 165         SharedPreferences pref = U.getSharedPreferences(context);
 166         if(pref.getBoolean("dashboard", false)) {
 167             if(pref.getBoolean("taskbar_active", false) || LauncherHelper.getInstance().isOnHomeScreen()) {
 168                 if(U.canDrawOverlays(context, host instanceof HomeActivityDelegate))
 169                     drawDashboard(host);
 170                 else {
 171                     pref.edit().putBoolean("taskbar_active", false).apply();
 172
 173                     host.terminate();
 174                 }
 175             } else host.terminate();
 176         } else host.terminate();
 177     }
 178
 179     @SuppressLint("RtlHardcoded")
 180     private void drawDashboard(Host host) {
 181         final ViewParams params = new ViewParams(
 182                 WindowManager.LayoutParams.MATCH_PARENT,
 183                 WindowManager.LayoutParams.MATCH_PARENT,
 184                 -1,
 185                 WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE | WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM
 186         );
 187
 188         // Initialize views
 189         layout = new LinearLayout(context);
 190         layout.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
 191         layout.setVisibility(View.GONE);
 192         layout.setAlpha(0);
 193
 194         SharedPreferences pref = U.getSharedPreferences(context);
 195         int width = pref.getInt("dashboard_width", context.getApplicationContext().getResources().getInteger(R.integer.dashboard_width));
 196         int height = pref.getInt("dashboard_height", context.getApplicationContext().getResources().getInteger(R.integer.dashboard_height));
 197
 198         boolean isPortrait = context.getApplicationContext().getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT;
 199         boolean isLandscape = context.getApplicationContext().getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE;
 200
 201         if(isPortrait) {
 202             columns = height;
 203             rows = width;
 204         }
 205
 206         if(isLandscape) {
 207             columns = width;
 208             rows = height;
 209         }
 210
 211         maxSize = columns * rows;
 212
 213         int backgroundTint = U.getBackgroundTint(context);
 214         int accentColor = U.getAccentColor(context);
 215         int accentColorAlt = accentColor;
 216         accentColorAlt = ColorUtils.setAlphaComponent(accentColorAlt, Color.alpha(accentColorAlt) / 2);
 217
 218         int cellCount = 0;
 219
 220         for(int i = 0; i < columns; i++) {
 221             LinearLayout layout2 = new LinearLayout(context);
 222             layout2.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT, 1));
 223             layout2.setOrientation(LinearLayout.VERTICAL);
 224
 225             for(int j = 0; j < rows; j++) {
 226                 DashboardCell cellLayout = (DashboardCell) View.inflate(context, R.layout.dashboard, null);
 227                 cellLayout.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT, 1));
 228                 cellLayout.setBackgroundColor(backgroundTint);
 229                 cellLayout.setOnClickListener(cellOcl);
 230                 cellLayout.setOnHoverListener(cellOhl);
 231
 232                 TextView empty = cellLayout.findViewById(R.id.empty);
 233                 empty.setBackgroundColor(accentColorAlt);
 234                 empty.setTextColor(accentColor);
 235
 236                 Bundle bundle = new Bundle();
 237                 bundle.putInt("cellId", cellCount);
 238
 239                 cellLayout.setTag(bundle);
 240                 cells.put(cellCount, cellLayout);
 241                 cellCount++;
 242
 243                 layout2.addView(cellLayout);
 244             }
 245
 246             layout.addView(layout2);
 247         }
 248
 249         mAppWidgetManager = AppWidgetManager.getInstance(context);
 250         mAppWidgetHost = new AppWidgetHost(context, APPWIDGET_HOST_ID);
 251         mAppWidgetHost.startListening();
 252
 253         for(int i = 0; i < maxSize; i++) {
 254             int appWidgetId = pref.getInt("dashboard_widget_" + i, -1);
 255             if(appWidgetId != -1)
 256                 addWidget(appWidgetId, i, false);
 257             else if(pref.getBoolean("dashboard_widget_" + i + "_placeholder", false))
 258                 addPlaceholder(i);
 259         }
 260
 261         mAppWidgetHost.stopListening();
 262
 263         LocalBroadcastManager lbm = LocalBroadcastManager.getInstance(context);
 264
 265         lbm.unregisterReceiver(toggleReceiver);
 266         lbm.unregisterReceiver(addWidgetReceiver);
 267         lbm.unregisterReceiver(removeWidgetReceiver);
 268         lbm.unregisterReceiver(hideReceiver);
 269
 270         lbm.registerReceiver(toggleReceiver, new IntentFilter("com.farmerbb.taskbar.TOGGLE_DASHBOARD"));
 271         lbm.registerReceiver(addWidgetReceiver, new IntentFilter("com.farmerbb.taskbar.ADD_WIDGET_COMPLETED"));
 272         lbm.registerReceiver(removeWidgetReceiver, new IntentFilter("com.farmerbb.taskbar.REMOVE_WIDGET_COMPLETED"));
 273         lbm.registerReceiver(hideReceiver, new IntentFilter("com.farmerbb.taskbar.HIDE_DASHBOARD"));
 274
 275         host.addView(layout, params);
 276
 277         new Handler().postDelayed(() -> {
 278             int paddingSize = context.getResources().getDimensionPixelSize(R.dimen.icon_size);
 279
 280             switch(U.getTaskbarPosition(context)) {
 281                 case "top_vertical_left":
 282                 case "bottom_vertical_left":
 283                     layout.setPadding(paddingSize, 0, 0, 0);
 284                     break;
 285                 case "top_left":
 286                 case "top_right":
 287                     layout.setPadding(0, paddingSize, 0, 0);
 288                     break;
 289                 case "top_vertical_right":
 290                 case "bottom_vertical_right":
 291                     layout.setPadding(0, 0, paddingSize, 0);
 292                     break;
 293                 case "bottom_left":
 294                 case "bottom_right":
 295                     layout.setPadding(0, 0, 0, paddingSize);
 296                     break;
 297             }
 298         }, 100);
 299     }
 300
 301     private void toggleDashboard() {
 302         if(layout.getVisibility() == View.GONE)
 303             showDashboard();
 304         else
 305             hideDashboard();
 306     }
 307
 308     @SuppressWarnings("deprecation")
 309     @TargetApi(Build.VERSION_CODES.N)
 310     private void showDashboard() {
 311         if(layout.getVisibility() == View.GONE) {
 312             layout.setOnClickListener(ocl);
 313             fadeIn();
 314
 315             LocalBroadcastManager.getInstance(context).sendBroadcast(new Intent("com.farmerbb.taskbar.DASHBOARD_APPEARING"));
 316             LocalBroadcastManager.getInstance(context).sendBroadcast(new Intent("com.farmerbb.taskbar.HIDE_START_MENU"));
 317
 318             boolean inFreeformMode = FreeformHackHelper.getInstance().isInFreeformWorkspace();
 319
 320             final SharedPreferences pref = U.getSharedPreferences(context);
 321             Intent intent = null;
 322
 323             switch(pref.getString("theme", "light")) {
 324                 case "light":
 325                     intent = new Intent(context, DashboardActivity.class);
 326                     break;
 327                 case "dark":
 328                     intent = new Intent(context, DashboardActivityDark.class);
 329                     break;
 330             }
 331
 332             if(intent != null) {
 333                 intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
 334                 intent.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
 335             }
 336
 337             if(inFreeformMode) {
 338                 if(intent != null && U.hasBrokenSetLaunchBoundsApi())
 339                     intent.putExtra("context_menu_fix", true);
 340
 341                 U.startActivityMaximized(context, intent);
 342             } else
 343                 context.startActivity(intent);
 344
 345             for(int i = 0; i < maxSize; i++) {
 346                 final DashboardCell cellLayout = cells.get(i);
 347                 final AppWidgetHostView hostView = widgets.get(i);
 348
 349                 if(hostView != null) {
 350                     try {
 351                         context.getPackageManager().getApplicationInfo(hostView.getAppWidgetInfo().provider.getPackageName(), 0);
 352                         hostView.post(() -> {
 353                             ViewGroup.LayoutParams params = hostView.getLayoutParams();
 354                             params.width = cellLayout.getWidth();
 355                             params.height = cellLayout.getHeight();
 356                             hostView.setLayoutParams(params);
 357                             hostView.updateAppWidgetSize(null, cellLayout.getWidth(), cellLayout.getHeight(), cellLayout.getWidth(), cellLayout.getHeight());
 358                         });
 359                     } catch (PackageManager.NameNotFoundException e) {
 360                         removeWidget(i, false);
 361                     } catch (NullPointerException e) {
 362                         removeWidget(i, true);
 363                     }
 364                 }
 365             }
 366
 367             if(!pref.getBoolean("dashboard_tutorial_shown", false)) {
 368                 U.showToastLong(context, R.string.dashboard_tutorial);
 369                 pref.edit().putBoolean("dashboard_tutorial_shown", true).apply();
 370             }
 371         }
 372     }
 373
 374     private void hideDashboard() {
 375         if(layout.getVisibility() == View.VISIBLE) {
 376             layout.setOnClickListener(null);
 377             fadeOut(true);
 378
 379             for(int i = 0; i < maxSize; i++) {
 380                 FrameLayout frameLayout = cells.get(i);
 381                 frameLayout.findViewById(R.id.empty).setVisibility(View.GONE);
 382             }
 383
 384             previouslySelectedCell = -1;
 385         }
 386     }
 387
 388     private void fadeIn() {
 389         mAppWidgetHost.startListening();
 390
 391         DashboardHelper.getInstance().setDashboardOpen(true);
 392
 393         layout.setVisibility(View.VISIBLE);
 394         layout.animate()
 395                 .alpha(1)
 396                 .setDuration(context.getResources().getInteger(android.R.integer.config_shortAnimTime))
 397                 .setListener(null);
 398     }
 399
 400     private void fadeOut(final boolean sendIntent) {
 401         mAppWidgetHost.stopListening();
 402
 403         DashboardHelper.getInstance().setDashboardOpen(false);
 404
 405         layout.animate()
 406                 .alpha(0)
 407                 .setDuration(context.getResources().getInteger(android.R.integer.config_shortAnimTime))
 408                 .setListener(new AnimatorListenerAdapter() {
 409                     @Override
 410                     public void onAnimationEnd(Animator animation) {
 411                         layout.setVisibility(View.GONE);
 412                         if(sendIntent) LocalBroadcastManager.getInstance(context).sendBroadcast(new Intent("com.farmerbb.taskbar.DASHBOARD_DISAPPEARING"));
 413                     }
 414                 });
 415     }
 416
 417     @TargetApi(Build.VERSION_CODES.M)
 418     @Override
 419     public void onRecreateHost(Host host) {
 420         if(layout != null) {
 421             try {
 422                 host.removeView(layout);
 423             } catch (IllegalArgumentException e) { /* Gracefully fail */ }
 424
 425             SharedPreferences pref = U.getSharedPreferences(context);
 426             if(U.canDrawOverlays(context, host instanceof HomeActivityDelegate))
 427                 drawDashboard(host);
 428             else {
 429                 pref.edit().putBoolean("taskbar_active", false).apply();
 430
 431                 host.terminate();
 432             }
 433         }
 434     }
 435
 436     @Override
 437     public void onDestroyHost(Host host) {
 438         if(layout != null)
 439             try {
 440                 host.removeView(layout);
 441             } catch (IllegalArgumentException e) { /* Gracefully fail */ }
 442
 443         LocalBroadcastManager lbm = LocalBroadcastManager.getInstance(context);
 444
 445         lbm.unregisterReceiver(toggleReceiver);
 446         lbm.unregisterReceiver(addWidgetReceiver);
 447         lbm.unregisterReceiver(removeWidgetReceiver);
 448         lbm.unregisterReceiver(hideReceiver);
 449
 450         lbm.sendBroadcast(new Intent("com.farmerbb.taskbar.DASHBOARD_DISAPPEARING"));
 451     }
 452
 453     private void cellClick(View view, boolean isActualClick) {
 454         Bundle bundle = (Bundle) view.getTag();
 455         int cellId = bundle.getInt("cellId");
 456         int appWidgetId = bundle.getInt("appWidgetId", -1);
 457
 458         int currentlySelectedCell = appWidgetId == -1 ? cellId : -1;
 459
 460         SharedPreferences pref = U.getSharedPreferences(context);
 461         boolean shouldShowPlaceholder = pref.getBoolean("dashboard_widget_" + cellId + "_placeholder", false);
 462         if(isActualClick && ((appWidgetId == -1 && currentlySelectedCell == previouslySelectedCell) || shouldShowPlaceholder)) {
 463             fadeOut(false);
 464
 465             FrameLayout frameLayout = cells.get(currentlySelectedCell);
 466             frameLayout.findViewById(R.id.empty).setVisibility(View.GONE);
 467
 468             Intent intent = new Intent("com.farmerbb.taskbar.ADD_WIDGET_REQUESTED");
 469             intent.putExtra("appWidgetId", APPWIDGET_HOST_ID);
 470             intent.putExtra("cellId", cellId);
 471             LocalBroadcastManager.getInstance(context).sendBroadcast(intent);
 472
 473             if(shouldShowPlaceholder) {
 474                 String providerName = pref.getString("dashboard_widget_" + cellId + "_provider", "null");
 475                 if(!providerName.equals("null")) {
 476                     ComponentName componentName = ComponentName.unflattenFromString(providerName);
 477
 478                     List<AppWidgetProviderInfo> providerInfoList = mAppWidgetManager.getInstalledProvidersForProfile(Process.myUserHandle());
 479                     for(AppWidgetProviderInfo info : providerInfoList) {
 480                         if(info.provider.equals(componentName)) {
 481                             U.showToast(context, context.getString(R.string.widget_restore_toast, info.loadLabel(context.getPackageManager())), Toast.LENGTH_SHORT);
 482                             break;
 483                         }
 484                     }
 485                 }
 486             }
 487
 488             previouslySelectedCell = -1;
 489         } else {
 490             for(int i = 0; i < maxSize; i++) {
 491                 FrameLayout frameLayout = cells.get(i);
 492                 frameLayout.findViewById(R.id.empty).setVisibility(i == currentlySelectedCell && !shouldShowPlaceholder ? View.VISIBLE : View.GONE);
 493             }
 494
 495             previouslySelectedCell = currentlySelectedCell;
 496         }
 497     }
 498
 499     private void cellLongClick(View view) {
 500         fadeOut(false);
 501
 502         Bundle bundle = (Bundle) view.getTag();
 503         int cellId = bundle.getInt("cellId");
 504
 505         Intent intent = new Intent("com.farmerbb.taskbar.REMOVE_WIDGET_REQUESTED");
 506         intent.putExtra("cellId", cellId);
 507         LocalBroadcastManager.getInstance(context).sendBroadcast(intent);
 508     }
 509
 510     private void addWidget(int appWidgetId, int cellId, boolean shouldSave) {
 511         AppWidgetProviderInfo appWidgetInfo = mAppWidgetManager.getAppWidgetInfo(appWidgetId);
 512
 513         final DashboardCell cellLayout = cells.get(cellId);
 514         final AppWidgetHostView hostView = mAppWidgetHost.createView(context, appWidgetId, appWidgetInfo);
 515         hostView.setAppWidget(appWidgetId, appWidgetInfo);
 516
 517         Bundle bundle = new Bundle();
 518         bundle.putInt("cellId", cellId);
 519         hostView.setTag(bundle);
 520
 521         cellLayout.findViewById(R.id.empty).setVisibility(View.GONE);
 522         cellLayout.findViewById(R.id.placeholder).setVisibility(View.GONE);
 523         cellLayout.setOnLongClickListener(olcl);
 524         cellLayout.setOnGenericMotionListener(ogml);
 525         cellLayout.setOnInterceptedLongPressListener(listener);
 526
 527         LinearLayout linearLayout = cellLayout.findViewById(R.id.dashboard);
 528         linearLayout.addView(hostView);
 529
 530         Bundle bundle2 = (Bundle) cellLayout.getTag();
 531         bundle2.putInt("appWidgetId", appWidgetId);
 532         cellLayout.setTag(bundle2);
 533
 534         widgets.put(cellId, hostView);
 535
 536         if(shouldSave) {
 537             SharedPreferences pref = U.getSharedPreferences(context);
 538             SharedPreferences.Editor editor = pref.edit();
 539             editor.putInt("dashboard_widget_" + cellId, appWidgetId);
 540             editor.putString("dashboard_widget_" + cellId + "_provider", appWidgetInfo.provider.flattenToString());
 541             editor.remove("dashboard_widget_" + cellId + "_placeholder");
 542             editor.apply();
 543         }
 544
 545         new Handler().post(() -> {
 546             ViewGroup.LayoutParams params = hostView.getLayoutParams();
 547             params.width = cellLayout.getWidth();
 548             params.height = cellLayout.getHeight();
 549             hostView.setLayoutParams(params);
 550             hostView.updateAppWidgetSize(null, cellLayout.getWidth(), cellLayout.getHeight(), cellLayout.getWidth(), cellLayout.getHeight());
 551         });
 552     }
 553
 554     private void removeWidget(int cellId, boolean tempRemove) {
 555         widgets.remove(cellId);
 556
 557         DashboardCell cellLayout = cells.get(cellId);
 558         Bundle bundle = (Bundle) cellLayout.getTag();
 559
 560         mAppWidgetHost.deleteAppWidgetId(bundle.getInt("appWidgetId"));
 561         bundle.remove("appWidgetId");
 562
 563         LinearLayout linearLayout = cellLayout.findViewById(R.id.dashboard);
 564         linearLayout.removeAllViews();
 565
 566         cellLayout.setTag(bundle);
 567         cellLayout.setOnClickListener(cellOcl);
 568         cellLayout.setOnHoverListener(cellOhl);
 569         cellLayout.setOnLongClickListener(null);
 570         cellLayout.setOnGenericMotionListener(null);
 571         cellLayout.setOnInterceptedLongPressListener(null);
 572
 573         SharedPreferences pref = U.getSharedPreferences(context);
 574         SharedPreferences.Editor editor = pref.edit();
 575         editor.remove("dashboard_widget_" + cellId);
 576
 577         if(tempRemove) {
 578             editor.putBoolean("dashboard_widget_" + cellId + "_placeholder", true);
 579             addPlaceholder(cellId);
 580         } else
 581             editor.remove("dashboard_widget_" + cellId + "_provider");
 582
 583         editor.apply();
 584     }
 585
 586     private void addPlaceholder(int cellId) {
 587         FrameLayout placeholder = cells.get(cellId).findViewById(R.id.placeholder);
 588         SharedPreferences pref = U.getSharedPreferences(context);
 589         String providerName = pref.getString("dashboard_widget_" + cellId + "_provider", "null");
 590
 591         if(!providerName.equals("null")) {
 592             ImageView imageView = placeholder.findViewById(R.id.placeholder_image);
 593             ComponentName componentName = ComponentName.unflattenFromString(providerName);
 594
 595             List<AppWidgetProviderInfo> providerInfoList = mAppWidgetManager.getInstalledProvidersForProfile(Process.myUserHandle());
 596             for(AppWidgetProviderInfo info : providerInfoList) {
 597                 if(info.provider.equals(componentName)) {
 598                     Drawable drawable = info.loadPreviewImage(context, -1);
 599                     if(drawable == null) drawable = info.loadIcon(context, -1);
 600
 601                     ColorMatrix matrix = new ColorMatrix();
 602                     matrix.setSaturation(0);
 603
 604                     imageView.setImageDrawable(drawable);
 605                     imageView.setColorFilter(new ColorMatrixColorFilter(matrix));
 606                     break;
 607                 }
 608             }
 609         }
 610
 611         placeholder.setVisibility(View.VISIBLE);
 612     }
 613 }