Full screen avatar circle to square shape transition.

app/src/main/java/org/thoughtcrime/securesms/animation/transitions/CircleSquareImageViewTransition.java

@@ -0,0 +1,83 @@
+package org.thoughtcrime.securesms.animation.transitions;
+
+import android.animation.Animator;
+import android.animation.ObjectAnimator;
+import android.annotation.TargetApi;
+import android.graphics.drawable.Drawable;
+import android.transition.Transition;
+import android.transition.TransitionValues;
+import android.util.Property;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ImageView;
+
+import androidx.core.graphics.drawable.RoundedBitmapDrawable;
+
+@TargetApi(21)
+abstract class CircleSquareImageViewTransition extends Transition {
+
+  private static final String CIRCLE_RATIO = "CIRCLE_RATIO";
+
+  private final boolean toCircle;
+
+  CircleSquareImageViewTransition(boolean toCircle) {
+    this.toCircle = toCircle;
+  }
+
+  @Override
+  public void captureStartValues(TransitionValues transitionValues) {
+    View view = transitionValues.view;
+    if (view instanceof ImageView) {
+      transitionValues.values.put(CIRCLE_RATIO, toCircle ? 0f : 1f);
+    }
+  }
+
+  @Override
+  public void captureEndValues(TransitionValues transitionValues) {
+    View view = transitionValues.view;
+    if (view instanceof ImageView) {
+      transitionValues.values.put(CIRCLE_RATIO, toCircle ? 1f : 0f);
+    }
+  }
+
+  @Override
+  public Animator createAnimator(ViewGroup sceneRoot, TransitionValues startValues, TransitionValues endValues) {
+    if (startValues == null || endValues == null) {
+      return null;
+    }
+
+    ImageView endImageView = (ImageView) endValues.view;
+    float     start        = (float) startValues.values.get(CIRCLE_RATIO);
+    float     end          = (float) endValues.values.get(CIRCLE_RATIO);
+
+    return ObjectAnimator.ofFloat(endImageView, new RadiusRatioProperty(), start, end);
+  }
+
+  static final class RadiusRatioProperty extends Property<ImageView, Float> {
+
+    private float ratio;
+
+    RadiusRatioProperty() {
+      super(Float.class, "circle_ratio");
+    }
+
+    @Override
+    final public void set(ImageView imageView, Float ratio) {
+      this.ratio = ratio;
+      Drawable imageViewDrawable = imageView.getDrawable();
+      if (imageViewDrawable instanceof RoundedBitmapDrawable) {
+        RoundedBitmapDrawable drawable = (RoundedBitmapDrawable) imageViewDrawable;
+        if (ratio > 0.95) {
+          drawable.setCircular(true);
+        } else {
+          drawable.setCornerRadius(Math.min(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight()) * ratio * 0.5f);
+        }
+      }
+    }
+
+    @Override
+    public Float get(ImageView object) {
+      return ratio;
+    }
+  }
+}

app/src/main/java/org/thoughtcrime/securesms/animation/transitions/CircleToSquareImageViewTransition.java

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+package org.thoughtcrime.securesms.animation.transitions;
+
+import android.annotation.TargetApi;
+import android.content.Context;
+import android.util.AttributeSet;
+
+/**
+ * Will only transition {@link android.widget.ImageView}s that contain a {@link androidx.core.graphics.drawable.RoundedBitmapDrawable}.
+ */
+@TargetApi(21)
+public final class CircleToSquareImageViewTransition extends CircleSquareImageViewTransition {
+  public CircleToSquareImageViewTransition(Context context, AttributeSet attrs) {
+    super(false);
+  }
+}

app/src/main/java/org/thoughtcrime/securesms/animation/transitions/SquareToCircleImageViewTransition.java

@@ -0,0 +1,15 @@
+package org.thoughtcrime.securesms.animation.transitions;
+
+import android.annotation.TargetApi;
+import android.content.Context;
+import android.util.AttributeSet;
+
+/**
+ * Will only transition {@link android.widget.ImageView}s that contain a {@link androidx.core.graphics.drawable.RoundedBitmapDrawable}.
+ */
+@TargetApi(21)
+public final class SquareToCircleImageViewTransition extends CircleSquareImageViewTransition {
+  public SquareToCircleImageViewTransition(Context context, AttributeSet attrs) {
+    super(true);
+  }
+}