regression: fixed continuous orientation monitoring causing performance issues and rendering glitches

app/src/main/java/io/github/sspanak/tt9/ime/CommandHandler.java

@@ -180,6 +180,10 @@ abstract public class CommandHandler extends VoiceHandler {
 
 
 	public void showCommandPalette() {
+		if (mainView.isCommandPaletteShown()) {
+			return;
+		}
+
 		suggestionOps.cancelDelayedAccept();
 		suggestionOps.acceptIncomplete();
 		mInputMode.reset();

app/src/main/java/io/github/sspanak/tt9/ime/MainViewHandler.java

@@ -1,9 +1,8 @@
 package io.github.sspanak.tt9.ime;
 
-import android.view.OrientationEventListener;
-
 import androidx.annotation.Nullable;
 
+import io.github.sspanak.tt9.ime.helpers.OrientationListener;
 import io.github.sspanak.tt9.ime.modes.ModeABC;
 import io.github.sspanak.tt9.ime.voice.VoiceInputOps;
 import io.github.sspanak.tt9.languages.Language;
@@ -14,19 +13,15 @@ import io.github.sspanak.tt9.ui.main.ResizableMainView;
  * Informational methods for the on-screen keyboard
  **/
 abstract public class MainViewHandler extends HotkeyHandler {
+	OrientationListener orientationListener;
+
 	@Override
 	protected void onInit() {
 		super.onInit();
 
-		OrientationEventListener orientationListener = new OrientationEventListener(getApplicationContext()) {
+		if (orientationListener == null) {
-			@Override
+			orientationListener = new OrientationListener(this, mainView::onOrientationChanged);
-			public void onOrientationChanged(int orientation) {
+			orientationListener.start();
-				mainView.onOrientationChanged();
-			}
-		};
-
-		if (orientationListener.canDetectOrientation()) {
-			orientationListener.enable();
 		}
 	}
 

app/src/main/java/io/github/sspanak/tt9/ime/helpers/OrientationListener.java

@@ -0,0 +1,43 @@
+package io.github.sspanak.tt9.ime.helpers;
+
+import android.content.Context;
+
+import androidx.annotation.NonNull;
+
+public class OrientationListener extends android.view.OrientationEventListener {
+	private static final short ORIENTATION_LANDSCAPE = 1;
+	private static final short ORIENTATION_UNKNOWN = 0;
+	private static final short ORIENTATION_PORTRAIT = -1;
+
+	private short previousOrientation = ORIENTATION_UNKNOWN;
+	private final Runnable onChange;
+
+	public OrientationListener(@NonNull Context context, @NonNull Runnable onChange) {
+		super(context);
+		this.onChange = onChange;
+	}
+
+	@Override
+	public void onOrientationChanged(int orientation) {
+		short currentOrientation;
+
+		if (orientation > 345 || orientation < 15 || (orientation > 165 && orientation < 195)) {
+			currentOrientation = ORIENTATION_PORTRAIT;
+		} else if ((orientation > 75 && orientation < 105) || (orientation > 255 && orientation < 285)) {
+			currentOrientation = ORIENTATION_LANDSCAPE;
+		} else {
+			return;
+		}
+
+		if (currentOrientation != previousOrientation) {
+			previousOrientation = currentOrientation;
+			onChange.run();
+		}
+	}
+
+	public void start() {
+		if (canDetectOrientation()) {
+			enable();
+		}
+	}
+}

app/src/main/java/io/github/sspanak/tt9/ui/main/ResizableMainView.java

@@ -81,6 +81,7 @@ public class ResizableMainView extends MainView implements View.OnAttachStateCha
 	public void onOrientationChanged() {
 		calculateSnapHeights();
 		calculateInitialHeight();
+		hideCommandPalette();
 		render();
 	}