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.SharedPreferences;
  34 import android.content.pm.PackageManager;
  35 import android.content.res.Configuration;
  36 import android.graphics.Color;
  37 import android.graphics.ColorMatrix;
  38 import android.graphics.ColorMatrixColorFilter;
  39 import android.graphics.drawable.Drawable;
  40 import android.os.Build;
  41 import android.os.Bundle;
  42 import android.os.Handler;
  43 import android.os.Process;
  44
  45 import androidx.annotation.NonNull;
  46 import androidx.annotation.VisibleForTesting;
  47 import androidx.core.graphics.ColorUtils;
  48 import android.util.SparseArray;
  49 import android.view.MotionEvent;
  50 import android.view.PointerIcon;
  51 import android.view.View;
  52 import android.view.ViewGroup;
  53 import android.view.WindowManager;
  54 import android.widget.FrameLayout;
  55 import android.widget.ImageView;
  56 import android.widget.LinearLayout;
  57 import android.widget.TextView;
  58 import android.widget.Toast;
  59
  60 import com.farmerbb.taskbar.R;
  61 import com.farmerbb.taskbar.activity.DashboardActivity;
  62 import com.farmerbb.taskbar.helper.LauncherHelper;
  63 import com.farmerbb.taskbar.util.Constants;
  64 import com.farmerbb.taskbar.util.TaskbarPosition;
  65 import com.farmerbb.taskbar.helper.DashboardHelper;
  66 import com.farmerbb.taskbar.widget.DashboardCell;
  67 import com.farmerbb.taskbar.helper.FreeformHackHelper;
  68 import com.farmerbb.taskbar.util.U;
  69
  70 import java.util.List;
  71
  72 import static com.farmerbb.taskbar.util.Constants.*;
  73
  74 public class DashboardController extends UIController {
  75
  76     private AppWidgetManager mAppWidgetManager;
  77     private AppWidgetHost mAppWidgetHost;
  78
  79     private LinearLayout layout;
  80
  81     private SparseArray<DashboardCell> cells = new SparseArray<>();
  82     private SparseArray<AppWidgetHostView> widgets = new SparseArray<>();
  83
  84     private final int APPWIDGET_HOST_ID = 123;
  85
  86     private int columns;
  87     private int rows;
  88     private int maxSize;
  89     private int previouslySelectedCell = -1;
  90
  91     private View.OnClickListener ocl = view -> toggleDashboard();
  92
  93     private View.OnClickListener cellOcl = view -> cellClick(view, true);
  94
  95     private View.OnHoverListener cellOhl = (v, event) -> {
  96         cellClick(v, false);
  97
  98         if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.N)
  99             v.setPointerIcon(PointerIcon.getSystemIcon(context, PointerIcon.TYPE_DEFAULT));
 100
 101         return false;
 102     };
 103
 104     private View.OnLongClickListener olcl = v -> {
 105         cellLongClick(v);
 106         return true;
 107     };
 108
 109     private View.OnGenericMotionListener ogml = (view, motionEvent) -> {
 110         if(motionEvent.getAction() == MotionEvent.ACTION_BUTTON_PRESS
 111                 && motionEvent.getButtonState() == MotionEvent.BUTTON_SECONDARY)
 112             cellLongClick(view);
 113
 114         return false;
 115     };
 116
 117     private DashboardCell.OnInterceptedLongPressListener listener = this::cellLongClick;
 118
 119     private BroadcastReceiver toggleReceiver = new BroadcastReceiver() {
 120         @Override
 121         public void onReceive(Context context, Intent intent) {
 122             toggleDashboard();
 123         }
 124     };
 125
 126     private BroadcastReceiver addWidgetReceiver = new BroadcastReceiver() {
 127         @Override
 128         public void onReceive(Context context, Intent intent) {
 129             fadeIn();
 130             addWidget(intent);
 131         }
 132     };
 133
 134     private BroadcastReceiver removeWidgetReceiver = new BroadcastReceiver() {
 135         @Override
 136         public void onReceive(Context context, Intent intent) {
 137             fadeIn();
 138
 139             if(intent.hasExtra(EXTRA_CELL_ID)) {
 140                 int cellId = intent.getExtras().getInt(EXTRA_CELL_ID, -1);
 141
 142                 removeWidget(cellId, false);
 143             }
 144         }
 145     };
 146
 147     private BroadcastReceiver hideReceiver = new BroadcastReceiver() {
 148         @Override
 149         public void onReceive(Context context, Intent intent) {
 150             hideDashboard();
 151         }
 152     };
 153
 154     public DashboardController(Context context) {
 155         super(context);
 156     }
 157
 158     @TargetApi(Build.VERSION_CODES.M)
 159     @Override
 160     public void onCreateHost(UIHost host) {
 161         if(U.getBooleanPrefWithDefault(context, PREF_DASHBOARD))
 162             init(context, host, () -> drawDashboard(host));
 163         else
 164             host.terminate();
 165     }
 166
 167     @SuppressLint("RtlHardcoded")
 168     private void drawDashboard(UIHost host) {
 169         final ViewParams params = new ViewParams(
 170                 WindowManager.LayoutParams.MATCH_PARENT,
 171                 WindowManager.LayoutParams.MATCH_PARENT,
 172                 -1,
 173                 WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE | WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM,
 174                 getBottomMargin(context, host)
 175         );
 176
 177         // Initialize views
 178         layout = new LinearLayout(context);
 179         layout.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
 180         layout.setVisibility(View.GONE);
 181         layout.setAlpha(0);
 182
 183         SharedPreferences pref = U.getSharedPreferences(context);
 184         int width = U.getIntPrefWithDefault(context, PREF_DASHBOARD_WIDTH);
 185         int height = U.getIntPrefWithDefault(context, PREF_DASHBOARD_HEIGHT);
 186
 187         int orientation = U.getDisplayOrientation(context);
 188         boolean isPortrait = orientation == Configuration.ORIENTATION_PORTRAIT;
 189         boolean isLandscape = orientation == Configuration.ORIENTATION_LANDSCAPE;
 190
 191         if(isPortrait) {
 192             columns = height;
 193             rows = width;
 194         }
 195
 196         if(isLandscape) {
 197             columns = width;
 198             rows = height;
 199         }
 200
 201         maxSize = columns * rows;
 202
 203         int backgroundTint = U.getBackgroundTint(context);
 204         int accentColor = U.getAccentColor(context);
 205         int accentColorAlt = accentColor;
 206         accentColorAlt = ColorUtils.setAlphaComponent(accentColorAlt, Color.alpha(accentColorAlt) / 3);
 207
 208         int cellCount = 0;
 209
 210         for(int i = 0; i < columns; i++) {
 211             LinearLayout layout2 = new LinearLayout(context);
 212             layout2.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT, 1));
 213             layout2.setOrientation(LinearLayout.VERTICAL);
 214
 215             for(int j = 0; j < rows; j++) {
 216                 DashboardCell cellLayout = (DashboardCell) View.inflate(context, R.layout.tb_dashboard, null);
 217                 cellLayout.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT, 1));
 218                 cellLayout.setBackgroundColor(backgroundTint);
 219                 cellLayout.setOnClickListener(cellOcl);
 220                 cellLayout.setOnHoverListener(cellOhl);
 221                 cellLayout.setFocusable(false);
 222
 223                 TextView empty = cellLayout.findViewById(R.id.empty);
 224                 empty.setBackgroundColor(accentColorAlt);
 225                 empty.setTextColor(accentColor);
 226
 227                 Bundle bundle = new Bundle();
 228                 bundle.putInt(EXTRA_CELL_ID, cellCount);
 229
 230                 cellLayout.setTag(bundle);
 231                 cells.put(cellCount, cellLayout);
 232                 cellCount++;
 233
 234                 layout2.addView(cellLayout);
 235             }
 236
 237             layout.addView(layout2);
 238         }
 239
 240         mAppWidgetManager = AppWidgetManager.getInstance(context);
 241         mAppWidgetHost = new AppWidgetHost(context, APPWIDGET_HOST_ID);
 242         mAppWidgetHost.startListening();
 243
 244         for(int i = 0; i < maxSize; i++) {
 245             int appWidgetId = pref.getInt(PREF_DASHBOARD_WIDGET_PREFIX + i, -1);
 246             if(appWidgetId != -1)
 247                 addWidget(appWidgetId, i, false);
 248             else if (pref.getBoolean(
 249                     PREF_DASHBOARD_WIDGET_PREFIX
 250                             + i
 251                             + PREF_DASHBOARD_WIDGET_PLACEHOLDER_SUFFIX,
 252                     false)) {
 253                 addPlaceholder(i);
 254             }
 255         }
 256
 257         mAppWidgetHost.stopListening();
 258
 259         U.registerReceiver(context, toggleReceiver, ACTION_TOGGLE_DASHBOARD);
 260         U.registerReceiver(context, addWidgetReceiver, ACTION_ADD_WIDGET_COMPLETED);
 261         U.registerReceiver(context, removeWidgetReceiver, ACTION_REMOVE_WIDGET_COMPLETED);
 262         U.registerReceiver(context, hideReceiver, ACTION_HIDE_DASHBOARD);
 263
 264         host.addView(layout, params);
 265
 266         new Handler().postDelayed(() ->
 267                 updatePaddingSize(
 268                         context,
 269                         layout,
 270                         TaskbarPosition.getTaskbarPosition(context)
 271                 ),
 272                 100
 273         );
 274     }
 275
 276     @VisibleForTesting
 277     void updatePaddingSize(Context context, LinearLayout layout, String position) {
 278         int paddingSize = context.getResources().getDimensionPixelSize(R.dimen.tb_icon_size);
 279
 280         switch(position) {
 281             case POSITION_TOP_VERTICAL_LEFT:
 282             case POSITION_BOTTOM_VERTICAL_LEFT:
 283                 layout.setPadding(paddingSize, 0, 0, 0);
 284                 break;
 285             case POSITION_TOP_LEFT:
 286             case POSITION_TOP_RIGHT:
 287                 layout.setPadding(0, paddingSize, 0, 0);
 288                 break;
 289             case POSITION_TOP_VERTICAL_RIGHT:
 290             case POSITION_BOTTOM_VERTICAL_RIGHT:
 291                 layout.setPadding(0, 0, paddingSize, 0);
 292                 break;
 293             case POSITION_BOTTOM_LEFT:
 294             case POSITION_BOTTOM_RIGHT:
 295                 layout.setPadding(0, 0, 0, paddingSize);
 296                 break;
 297         }
 298     }
 299
 300     private void toggleDashboard() {
 301         if(layout.getVisibility() == View.GONE)
 302             showDashboard();
 303         else
 304             hideDashboard();
 305     }
 306
 307     @TargetApi(Build.VERSION_CODES.N)
 308     private void showDashboard() {
 309         if(layout.getVisibility() == View.GONE) {
 310             layout.setOnClickListener(ocl);
 311             fadeIn();
 312
 313             U.sendBroadcast(context, ACTION_DASHBOARD_APPEARING);
 314             U.sendBroadcast(context, ACTION_HIDE_START_MENU);
 315
 316             boolean inFreeformMode = FreeformHackHelper.getInstance().isInFreeformWorkspace();
 317
 318             Intent intent = U.getThemedIntent(context, DashboardActivity.class);
 319             intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
 320             intent.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
 321
 322             if(inFreeformMode) {
 323                 if(U.hasBrokenSetLaunchBoundsApi())
 324                     intent.putExtra("context_menu_fix", true);
 325
 326                 U.startActivityMaximized(context, intent);
 327             } else
 328                 context.startActivity(intent);
 329
 330             for(int i = 0; i < maxSize; i++) {
 331                 final DashboardCell cellLayout = cells.get(i);
 332                 final AppWidgetHostView hostView = widgets.get(i);
 333
 334                 if(hostView != null) {
 335                     try {
 336                         context.getPackageManager().getApplicationInfo(hostView.getAppWidgetInfo().provider.getPackageName(), 0);
 337                         hostView.post(() -> {
 338                             ViewGroup.LayoutParams params = hostView.getLayoutParams();
 339                             params.width = cellLayout.getWidth();
 340                             params.height = cellLayout.getHeight();
 341                             hostView.setLayoutParams(params);
 342                             hostView.updateAppWidgetSize(null, cellLayout.getWidth(), cellLayout.getHeight(), cellLayout.getWidth(), cellLayout.getHeight());
 343                         });
 344                     } catch (PackageManager.NameNotFoundException e) {
 345                         removeWidget(i, false);
 346                     } catch (NullPointerException e) {
 347                         removeWidget(i, true);
 348                     }
 349                 }
 350             }
 351
 352             final SharedPreferences pref = U.getSharedPreferences(context);
 353             if(!pref.getBoolean(PREF_DASHBOARD_TUTORIAL_SHOWN, false)) {
 354                 U.showToastLong(context, R.string.tb_dashboard_tutorial);
 355                 pref.edit().putBoolean(PREF_DASHBOARD_TUTORIAL_SHOWN, true).apply();
 356             }
 357         }
 358     }
 359
 360     private void hideDashboard() {
 361         if(layout.getVisibility() == View.VISIBLE) {
 362             layout.setOnClickListener(null);
 363             fadeOut(true);
 364
 365             for(int i = 0; i < maxSize; i++) {
 366                 FrameLayout frameLayout = cells.get(i);
 367                 frameLayout.findViewById(R.id.empty).setVisibility(View.GONE);
 368             }
 369
 370             previouslySelectedCell = -1;
 371         }
 372     }
 373
 374     private void fadeIn() {
 375         mAppWidgetHost.startListening();
 376
 377         DashboardHelper.getInstance().setDashboardOpen(true);
 378
 379         layout.setVisibility(View.VISIBLE);
 380         layout.animate()
 381                 .alpha(1)
 382                 .setDuration(context.getResources().getInteger(android.R.integer.config_shortAnimTime))
 383                 .setListener(null);
 384     }
 385
 386     private void fadeOut(final boolean sendIntent) {
 387         mAppWidgetHost.stopListening();
 388
 389         DashboardHelper.getInstance().setDashboardOpen(false);
 390
 391         layout.animate()
 392                 .alpha(0)
 393                 .setDuration(context.getResources().getInteger(android.R.integer.config_shortAnimTime))
 394                 .setListener(new AnimatorListenerAdapter() {
 395                     @Override
 396                     public void onAnimationEnd(Animator animation) {
 397                         layout.setVisibility(View.GONE);
 398                         if(sendIntent) {
 399                             U.sendBroadcast(context, ACTION_DASHBOARD_DISAPPEARING);
 400                         }
 401                     }
 402                 });
 403     }
 404
 405     @TargetApi(Build.VERSION_CODES.M)
 406     @Override
 407     public void onRecreateHost(UIHost host) {
 408         if(layout != null) {
 409             try {
 410                 host.removeView(layout);
 411             } catch (IllegalArgumentException e) { /* Gracefully fail */ }
 412
 413             SharedPreferences pref = U.getSharedPreferences(context);
 414             if(U.canDrawOverlays(context))
 415                 drawDashboard(host);
 416             else {
 417                 pref.edit().putBoolean(PREF_TASKBAR_ACTIVE, false).apply();
 418
 419                 host.terminate();
 420             }
 421         }
 422     }
 423
 424     @Override
 425     public void onDestroyHost(UIHost host) {
 426         if(layout != null)
 427             try {
 428                 host.removeView(layout);
 429             } catch (IllegalArgumentException e) { /* Gracefully fail */ }
 430
 431         U.unregisterReceiver(context, toggleReceiver);
 432         U.unregisterReceiver(context, addWidgetReceiver);
 433         U.unregisterReceiver(context, removeWidgetReceiver);
 434         U.unregisterReceiver(context, hideReceiver);
 435
 436         SharedPreferences pref = U.getSharedPreferences(context);
 437         if(!LauncherHelper.getInstance().isOnSecondaryHomeScreen(context)
 438                 || !pref.getBoolean(PREF_DONT_STOP_DASHBOARD, false))
 439             U.sendBroadcast(context, ACTION_DASHBOARD_DISAPPEARING);
 440
 441         pref.edit().remove(PREF_DONT_STOP_DASHBOARD).apply();
 442     }
 443
 444     private void cellClick(View view, boolean isActualClick) {
 445         Bundle bundle = (Bundle) view.getTag();
 446         int cellId = bundle.getInt(EXTRA_CELL_ID);
 447         int appWidgetId = bundle.getInt(EXTRA_APPWIDGET_ID, -1);
 448
 449         int currentlySelectedCell = appWidgetId == -1 ? cellId : -1;
 450
 451         SharedPreferences pref = U.getSharedPreferences(context);
 452         boolean shouldShowPlaceholder =
 453                 pref.getBoolean(
 454                         PREF_DASHBOARD_WIDGET_PREFIX
 455                                 + cellId
 456                                 + PREF_DASHBOARD_WIDGET_PLACEHOLDER_SUFFIX,
 457                         false
 458                 );
 459         if(isActualClick && ((appWidgetId == -1 && currentlySelectedCell == previouslySelectedCell) || shouldShowPlaceholder)) {
 460             fadeOut(false);
 461
 462             FrameLayout frameLayout = cells.get(currentlySelectedCell);
 463             frameLayout.findViewById(R.id.empty).setVisibility(View.GONE);
 464
 465             Intent intent = new Intent(ACTION_ADD_WIDGET_REQUESTED);
 466             intent.putExtra(EXTRA_APPWIDGET_ID, APPWIDGET_HOST_ID);
 467             intent.putExtra(EXTRA_CELL_ID, cellId);
 468             U.sendBroadcast(context, intent);
 469
 470             if(shouldShowPlaceholder) {
 471                 String providerName =
 472                         pref.getString(
 473                                 PREF_DASHBOARD_WIDGET_PREFIX
 474                                         + cellId
 475                                         + PREF_DASHBOARD_WIDGET_PROVIDER_SUFFIX,
 476                                 "null"
 477                         );
 478                 if(!providerName.equals("null")) {
 479                     ComponentName componentName = ComponentName.unflattenFromString(providerName);
 480
 481                     List<AppWidgetProviderInfo> providerInfoList = mAppWidgetManager.getInstalledProvidersForProfile(Process.myUserHandle());
 482                     for(AppWidgetProviderInfo info : providerInfoList) {
 483                         if(info.provider.equals(componentName)) {
 484                             U.showToast(context, context.getString(R.string.tb_widget_restore_toast, info.loadLabel(context.getPackageManager())), Toast.LENGTH_SHORT);
 485                             break;
 486                         }
 487                     }
 488                 }
 489             }
 490
 491             previouslySelectedCell = -1;
 492         } else {
 493             for(int i = 0; i < maxSize; i++) {
 494                 FrameLayout frameLayout = cells.get(i);
 495                 frameLayout.findViewById(R.id.empty).setVisibility(i == currentlySelectedCell && !shouldShowPlaceholder ? View.VISIBLE : View.GONE);
 496             }
 497
 498             previouslySelectedCell = currentlySelectedCell;
 499         }
 500     }
 501
 502     private void cellLongClick(View view) {
 503         fadeOut(false);
 504
 505         Bundle bundle = (Bundle) view.getTag();
 506         int cellId = bundle.getInt(EXTRA_CELL_ID);
 507
 508         Intent intent = new Intent(ACTION_REMOVE_WIDGET_REQUESTED);
 509         intent.putExtra(EXTRA_CELL_ID, cellId);
 510         U.sendBroadcast(context, intent);
 511     }
 512
 513     @VisibleForTesting
 514     void addWidget(Intent intent) {
 515         if (intent.hasExtra(EXTRA_APPWIDGET_ID) && intent.hasExtra(EXTRA_CELL_ID)) {
 516             int appWidgetId = intent.getExtras().getInt(EXTRA_APPWIDGET_ID, -1);
 517             int cellId = intent.getExtras().getInt(EXTRA_CELL_ID, -1);
 518
 519             addWidget(appWidgetId, cellId, true);
 520         }
 521     }
 522
 523     private void addWidget(int appWidgetId, int cellId, boolean shouldSave) {
 524         AppWidgetProviderInfo appWidgetInfo = mAppWidgetManager.getAppWidgetInfo(appWidgetId);
 525
 526         final DashboardCell cellLayout = cells.get(cellId);
 527         final AppWidgetHostView hostView = mAppWidgetHost.createView(context, appWidgetId, appWidgetInfo);
 528         hostView.setAppWidget(appWidgetId, appWidgetInfo);
 529
 530         Bundle bundle = new Bundle();
 531         bundle.putInt(EXTRA_CELL_ID, cellId);
 532         hostView.setTag(bundle);
 533
 534         cellLayout.findViewById(R.id.empty).setVisibility(View.GONE);
 535         cellLayout.findViewById(R.id.placeholder).setVisibility(View.GONE);
 536         cellLayout.setOnLongClickListener(olcl);
 537         cellLayout.setOnGenericMotionListener(ogml);
 538         cellLayout.setOnInterceptedLongPressListener(listener);
 539
 540         LinearLayout linearLayout = cellLayout.findViewById(R.id.dashboard);
 541         linearLayout.addView(hostView);
 542
 543         Bundle bundle2 = (Bundle) cellLayout.getTag();
 544         bundle2.putInt(EXTRA_APPWIDGET_ID, appWidgetId);
 545         cellLayout.setTag(bundle2);
 546
 547         widgets.put(cellId, hostView);
 548
 549         if (shouldSave) {
 550             saveWidgetInfo(context, appWidgetInfo, cellId, appWidgetId);
 551         }
 552
 553         new Handler().post(() -> {
 554             ViewGroup.LayoutParams params = hostView.getLayoutParams();
 555             params.width = cellLayout.getWidth();
 556             params.height = cellLayout.getHeight();
 557             hostView.setLayoutParams(params);
 558             hostView.updateAppWidgetSize(null, cellLayout.getWidth(), cellLayout.getHeight(), cellLayout.getWidth(), cellLayout.getHeight());
 559         });
 560     }
 561
 562     @VisibleForTesting
 563     void saveWidgetInfo(Context context,
 564                         AppWidgetProviderInfo appWidgetInfo,
 565                         int cellId,
 566                         int appWidgetId) {
 567         SharedPreferences pref = U.getSharedPreferences(context);
 568         SharedPreferences.Editor editor = pref.edit();
 569         editor.putInt(PREF_DASHBOARD_WIDGET_PREFIX + cellId, appWidgetId);
 570         editor.putString(
 571                 PREF_DASHBOARD_WIDGET_PREFIX + cellId + PREF_DASHBOARD_WIDGET_PROVIDER_SUFFIX,
 572                 appWidgetInfo.provider.flattenToString()
 573         );
 574         editor.remove(
 575                 PREF_DASHBOARD_WIDGET_PREFIX
 576                         + cellId
 577                         + PREF_DASHBOARD_WIDGET_PLACEHOLDER_SUFFIX
 578         );
 579         editor.apply();
 580     }
 581
 582     private void removeWidget(int cellId, boolean tempRemove) {
 583         widgets.remove(cellId);
 584
 585         DashboardCell cellLayout = cells.get(cellId);
 586         Bundle bundle = (Bundle) cellLayout.getTag();
 587
 588         mAppWidgetHost.deleteAppWidgetId(bundle.getInt(EXTRA_APPWIDGET_ID));
 589         bundle.remove(EXTRA_APPWIDGET_ID);
 590
 591         LinearLayout linearLayout = cellLayout.findViewById(R.id.dashboard);
 592         linearLayout.removeAllViews();
 593
 594         cellLayout.setTag(bundle);
 595         cellLayout.setOnClickListener(cellOcl);
 596         cellLayout.setOnHoverListener(cellOhl);
 597         cellLayout.setOnLongClickListener(null);
 598         cellLayout.setOnGenericMotionListener(null);
 599         cellLayout.setOnInterceptedLongPressListener(null);
 600
 601         SharedPreferences pref = U.getSharedPreferences(context);
 602         SharedPreferences.Editor editor = pref.edit();
 603         editor.remove(PREF_DASHBOARD_WIDGET_PREFIX + cellId);
 604
 605         if (tempRemove) {
 606             editor.putBoolean(
 607                     PREF_DASHBOARD_WIDGET_PREFIX
 608                             + cellId
 609                             + PREF_DASHBOARD_WIDGET_PLACEHOLDER_SUFFIX,
 610                     true
 611             );
 612             addPlaceholder(cellId);
 613         } else {
 614             editor.remove(
 615                     PREF_DASHBOARD_WIDGET_PREFIX
 616                             + cellId
 617                             + PREF_DASHBOARD_WIDGET_PROVIDER_SUFFIX
 618             );
 619         }
 620         editor.apply();
 621     }
 622
 623     private void addPlaceholder(int cellId) {
 624         FrameLayout placeholder = cells.get(cellId).findViewById(R.id.placeholder);
 625         SharedPreferences pref = U.getSharedPreferences(context);
 626         String providerName =
 627                 pref.getString(
 628                         PREF_DASHBOARD_WIDGET_PREFIX
 629                                 + cellId
 630                                 + PREF_DASHBOARD_WIDGET_PROVIDER_SUFFIX,
 631                         "null"
 632                 );
 633
 634         if(!providerName.equals("null")) {
 635             ImageView imageView = placeholder.findViewById(R.id.placeholder_image);
 636             ComponentName componentName = ComponentName.unflattenFromString(providerName);
 637
 638             List<AppWidgetProviderInfo> providerInfoList = mAppWidgetManager.getInstalledProvidersForProfile(Process.myUserHandle());
 639             for(AppWidgetProviderInfo info : providerInfoList) {
 640                 if(info.provider.equals(componentName)) {
 641                     Drawable drawable = info.loadPreviewImage(context, -1);
 642                     if(drawable == null) drawable = info.loadIcon(context, -1);
 643
 644                     ColorMatrix matrix = new ColorMatrix();
 645                     matrix.setSaturation(0);
 646
 647                     imageView.setImageDrawable(drawable);
 648                     imageView.setColorFilter(new ColorMatrixColorFilter(matrix));
 649                     break;
 650                 }
 651             }
 652         }
 653
 654         placeholder.setVisibility(View.VISIBLE);
 655     }
 656 }