Adds diagnostic logging for LongScreenshotActivity

This adds logging of dimensions and positions of
crop handles after a long screenshot capture.

Switches to OneShotPreDrawListener where appropriate
to improve readability.

Bug: 232633995
Test: logging only change; manually, take long screenshot
      crop, save, observe result, verify results match
Change-Id: I699f8d69b78e89a7a5364fda84bc4d6316b77d31

packages/SystemUI/src/com/android/systemui/screenshot/CropView.java

@@ -117,18 +117,22 @@ public class CropView extends View {
 
     @Override
     protected Parcelable onSaveInstanceState() {
+        Log.d(TAG, "onSaveInstanceState");
         Parcelable superState = super.onSaveInstanceState();
 
         SavedState ss = new SavedState(superState);
         ss.mCrop = mCrop;
+        Log.d(TAG, "saving mCrop=" + mCrop);
+
         return ss;
     }
 
     @Override
     protected void onRestoreInstanceState(Parcelable state) {
+        Log.d(TAG, "onRestoreInstanceState");
         SavedState ss = (SavedState) state;
         super.onRestoreInstanceState(ss.getSuperState());
-
+        Log.d(TAG, "restoring mCrop=" + ss.mCrop + " (was " + mCrop + ")");
         mCrop = ss.mCrop;
     }
 
@@ -242,6 +246,7 @@ public class CropView extends View {
      * Set the given boundary to the given value without animation.
      */
     public void setBoundaryPosition(CropBoundary boundary, float position) {
+        Log.i(TAG, "setBoundaryPosition: " + boundary + ", position=" + position);
         position = (float) getAllowedValues(boundary).clamp(position);
         switch (boundary) {
             case TOP:
@@ -260,6 +265,7 @@ public class CropView extends View {
                 Log.w(TAG, "No boundary selected");
                 break;
         }
+        Log.i(TAG,  "Updated mCrop: " + mCrop);
 
         invalidate();
     }
@@ -350,26 +356,31 @@ public class CropView extends View {
         mCropInteractionListener = listener;
     }
 
-    private Range getAllowedValues(CropBoundary boundary) {
+    private Range<Float> getAllowedValues(CropBoundary boundary) {
+        float upper = 0f;
+        float lower = 1f;
         switch (boundary) {
             case TOP:
-                return new Range<>(0f,
-                        mCrop.bottom - pixelDistanceToFraction(mCropTouchMargin,
-                                CropBoundary.BOTTOM));
+                lower = 0f;
+                upper = mCrop.bottom - pixelDistanceToFraction(mCropTouchMargin,
+                        CropBoundary.BOTTOM);
+                break;
             case BOTTOM:
-                return new Range<>(
-                        mCrop.top + pixelDistanceToFraction(mCropTouchMargin,
-                                CropBoundary.TOP), 1f);
+                lower = mCrop.top + pixelDistanceToFraction(mCropTouchMargin, CropBoundary.TOP);
+                upper = 1;
+                break;
             case LEFT:
-                return new Range<>(0f,
-                        mCrop.right - pixelDistanceToFraction(mCropTouchMargin,
-                                CropBoundary.RIGHT));
+                lower = 0f;
+                upper = mCrop.right - pixelDistanceToFraction(mCropTouchMargin, CropBoundary.RIGHT);
+                break;
             case RIGHT:
-                return new Range<>(
-                        mCrop.left + pixelDistanceToFraction(mCropTouchMargin,
-                                CropBoundary.LEFT), 1f);
+                lower = mCrop.left + pixelDistanceToFraction(mCropTouchMargin, CropBoundary.LEFT);
+                upper = 1;
+                break;
         }
-        return null;
+        Log.i(TAG, "getAllowedValues: " + boundary + ", "
+                + "result=[lower=" + lower + ", upper=" + upper + "]");
+        return new Range<>(lower, upper);
     }
 
     /**

packages/SystemUI/src/com/android/systemui/screenshot/LongScreenshotActivity.java

@@ -36,17 +36,18 @@ import android.text.TextUtils;
 import android.util.Log;
 import android.view.ScrollCaptureResponse;
 import android.view.View;
-import android.view.ViewTreeObserver;
 import android.widget.ImageView;
 
 import androidx.constraintlayout.widget.ConstraintLayout;
 
 import com.android.internal.app.ChooserActivity;
 import com.android.internal.logging.UiEventLogger;
+import com.android.internal.view.OneShotPreDrawListener;
 import com.android.systemui.R;
 import com.android.systemui.dagger.qualifiers.Background;
 import com.android.systemui.dagger.qualifiers.Main;
 import com.android.systemui.flags.FeatureFlags;
+import com.android.systemui.screenshot.CropView.CropBoundary;
 import com.android.systemui.screenshot.ScrollCaptureController.LongScreenshot;
 import com.android.systemui.settings.UserTracker;
 
@@ -215,6 +216,7 @@ public class LongScreenshotActivity extends Activity {
         mPreview.setImageDrawable(drawable);
         mMagnifierView.setDrawable(mLongScreenshot.getDrawable(),
                 mLongScreenshot.getWidth(), mLongScreenshot.getHeight());
+        Log.i(TAG, "Completed: " + longScreenshot);
         // Original boundaries go from the image tile set's y=0 to y=pageSize, so
         // we animate to that as a starting crop position.
         float topFraction = Math.max(0,
@@ -223,31 +225,26 @@ public class LongScreenshotActivity extends Activity {
                 1 - (mLongScreenshot.getBottom() - mLongScreenshot.getPageHeight())
                         / (float) mLongScreenshot.getHeight());
 
+        Log.i(TAG, "topFraction: " + topFraction);
+        Log.i(TAG, "bottomFraction: " + bottomFraction);
+
         mEnterTransitionView.setImageDrawable(drawable);
-        mEnterTransitionView.getViewTreeObserver().addOnPreDrawListener(
-                new ViewTreeObserver.OnPreDrawListener() {
-                    @Override
-                    public boolean onPreDraw() {
-                        mEnterTransitionView.getViewTreeObserver().removeOnPreDrawListener(this);
-                        updateImageDimensions();
-                        mEnterTransitionView.post(() -> {
-                            Rect dest = new Rect();
-                            mEnterTransitionView.getBoundsOnScreen(dest);
-                            mLongScreenshotHolder.takeTransitionDestinationCallback()
-                                    .setTransitionDestination(dest, () -> {
-                                        mPreview.animate().alpha(1f);
-                                        mCropView.setBoundaryPosition(
-                                                CropView.CropBoundary.TOP, topFraction);
-                                        mCropView.setBoundaryPosition(
-                                                CropView.CropBoundary.BOTTOM, bottomFraction);
-                                        mCropView.animateEntrance();
-                                        mCropView.setVisibility(View.VISIBLE);
-                                        setButtonsEnabled(true);
-                                    });
+        OneShotPreDrawListener.add(mEnterTransitionView, () -> {
+            updateImageDimensions();
+            mEnterTransitionView.post(() -> {
+                Rect dest = new Rect();
+                mEnterTransitionView.getBoundsOnScreen(dest);
+                mLongScreenshotHolder.takeTransitionDestinationCallback()
+                        .setTransitionDestination(dest, () -> {
+                            mPreview.animate().alpha(1f);
+                            mCropView.setBoundaryPosition(CropBoundary.TOP, topFraction);
+                            mCropView.setBoundaryPosition(CropBoundary.BOTTOM, bottomFraction);
+                            mCropView.animateEntrance();
+                            mCropView.setVisibility(View.VISIBLE);
+                            setButtonsEnabled(true);
                         });
-                        return true;
-                    }
-                });
+            });
+        });
 
         // Immediately export to temp image file for saved state
         mCacheSaveFuture = mImageExporter.exportToRawFile(mBackgroundExecutor,

packages/SystemUI/src/com/android/systemui/screenshot/ScrollCaptureController.java

@@ -130,8 +130,14 @@ public class ScrollCaptureController {
 
         @Override
         public String toString() {
-            return "LongScreenshot{w=" + mImageTileSet.getWidth()
-                    + ", h=" + mImageTileSet.getHeight() + "}";
+            return "LongScreenshot{"
+                    + "l=" + mImageTileSet.getLeft() + ", "
+                    + "t=" + mImageTileSet.getTop() + ", "
+                    + "r=" + mImageTileSet.getRight() + ", "
+                    + "b=" + mImageTileSet.getBottom() + ", "
+                    + "w=" + mImageTileSet.getWidth() + ", "
+                    + "h=" + mImageTileSet.getHeight()
+                    + "}";
         }
 
         public Drawable getDrawable() {