Android: Programmatically open/close cheat details

Only has an effect when using a narrow screen.

Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/features/cheats/model/CheatsViewModel.java

@@ -12,6 +12,8 @@ public class CheatsViewModel extends ViewModel
 
   private final MutableLiveData<Cheat> mSelectedCheat = new MutableLiveData<>(null);
 
+  private final MutableLiveData<Boolean> mOpenDetailsViewEvent = new MutableLiveData<>(false);
+
   private PatchCheat[] mPatchCheats;
   private ARCheat[] mARCheats;
   private GeckoCheat[] mGeckoCheats;
@@ -76,6 +78,17 @@ public class CheatsViewModel extends ViewModel
     mSelectedCheat.setValue(cheat);
   }
 
+  public LiveData<Boolean> getOpenDetailsViewEvent()
+  {
+    return mOpenDetailsViewEvent;
+  }
+
+  public void openDetailsView()
+  {
+    mOpenDetailsViewEvent.setValue(true);
+    mOpenDetailsViewEvent.setValue(false);
+  }
+
   public Cheat[] getPatchCheats()
   {
     return mPatchCheats;

Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/features/cheats/ui/CheatViewHolder.java

@@ -50,6 +50,7 @@ public class CheatViewHolder extends ViewHolder
   public void onClick(View root)
   {
     mViewModel.setSelectedCheat(mCheat);
+    mViewModel.openDetailsView();
   }
 
   public void onCheckedChanged(CompoundButton buttonView, boolean isChecked)

Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/features/cheats/ui/CheatsActivity.java

@@ -8,9 +8,12 @@ import android.os.Bundle;
 
 import androidx.appcompat.app.AppCompatActivity;
 import androidx.lifecycle.ViewModelProvider;
+import androidx.slidingpanelayout.widget.SlidingPaneLayout;
 
 import org.dolphinemu.dolphinemu.R;
+import org.dolphinemu.dolphinemu.features.cheats.model.Cheat;
 import org.dolphinemu.dolphinemu.features.cheats.model.CheatsViewModel;
+import org.dolphinemu.dolphinemu.ui.TwoPaneOnBackPressedCallback;
 import org.dolphinemu.dolphinemu.ui.main.MainPresenter;
 
 public class CheatsActivity extends AppCompatActivity
@@ -22,6 +25,8 @@ public class CheatsActivity extends AppCompatActivity
   private int mRevision;
   private CheatsViewModel mViewModel;
 
+  private SlidingPaneLayout mSlidingPaneLayout;
+
   public static void launch(Context context, String gameId, int revision)
   {
     Intent intent = new Intent(context, CheatsActivity.class);
@@ -47,6 +52,16 @@ public class CheatsActivity extends AppCompatActivity
     mViewModel.load(mGameId, mRevision);
 
     setContentView(R.layout.activity_cheats);
+
+    mSlidingPaneLayout = findViewById(R.id.sliding_pane_layout);
+
+    getOnBackPressedDispatcher().addCallback(this,
+            new TwoPaneOnBackPressedCallback(mSlidingPaneLayout));
+
+    mViewModel.getSelectedCheat().observe(this, this::onSelectedCheatChanged);
+    onSelectedCheatChanged(mViewModel.getSelectedCheat().getValue());
+
+    mViewModel.getOpenDetailsViewEvent().observe(this, this::openDetailsView);
   }
 
   @Override
@@ -56,4 +71,21 @@ public class CheatsActivity extends AppCompatActivity
 
     mViewModel.saveIfNeeded(mGameId, mRevision);
   }
+
+  private void onSelectedCheatChanged(Cheat selectedCheat)
+  {
+    boolean cheatSelected = selectedCheat != null;
+
+    if (!cheatSelected && mSlidingPaneLayout.isOpen())
+      mSlidingPaneLayout.close();
+
+    mSlidingPaneLayout.setLockMode(cheatSelected ?
+            SlidingPaneLayout.LOCK_MODE_UNLOCKED : SlidingPaneLayout.LOCK_MODE_LOCKED_CLOSED);
+  }
+
+  private void openDetailsView(boolean open)
+  {
+    if (open)
+      mSlidingPaneLayout.open();
+  }
 }

Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/ui/TwoPaneOnBackPressedCallback.java

@@ -0,0 +1,46 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+package org.dolphinemu.dolphinemu.ui;
+
+import android.view.View;
+
+import androidx.activity.OnBackPressedCallback;
+import androidx.annotation.NonNull;
+import androidx.slidingpanelayout.widget.SlidingPaneLayout;
+
+public class TwoPaneOnBackPressedCallback extends OnBackPressedCallback
+        implements SlidingPaneLayout.PanelSlideListener
+{
+  private final SlidingPaneLayout mSlidingPaneLayout;
+
+  public TwoPaneOnBackPressedCallback(@NonNull SlidingPaneLayout slidingPaneLayout)
+  {
+    super(slidingPaneLayout.isSlideable() && slidingPaneLayout.isOpen());
+    mSlidingPaneLayout = slidingPaneLayout;
+    slidingPaneLayout.addPanelSlideListener(this);
+  }
+
+  @Override
+  public void handleOnBackPressed()
+  {
+    mSlidingPaneLayout.close();
+  }
+
+  @Override
+  public void onPanelSlide(@NonNull View panel, float slideOffset)
+  {
+  }
+
+  @Override
+  public void onPanelOpened(@NonNull View panel)
+  {
+    setEnabled(true);
+  }
+
+  @Override
+  public void onPanelClosed(@NonNull View panel)
+  {
+    setEnabled(false);
+  }
+}
+