1 files changed, 230 insertions, 0 deletions
diff --git a/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/attribution/AttributionMeasure.java b/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/attribution/AttributionMeasure.java
new file mode 100644
index 0000000000..c2408ca718
--- /dev/null
+++ b/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/attribution/AttributionMeasure.java
@@ -0,0 +1,230 @@
+package com.mapbox.mapboxsdk.attribution;
+
+import android.graphics.Bitmap;
+import android.graphics.PointF;
+import android.widget.TextView;
+
+import java.util.Arrays;
+import java.util.List;
+
+public class AttributionMeasure {
+
+  private Bitmap logo;
+  private Bitmap logoSmall;
+  private Bitmap snapshot;
+  private TextView textView;
+  private TextView textViewShort;
+  private float margin;
+
+  private boolean shorterText;
+
+  AttributionMeasure(Bitmap snapshot, Bitmap logo, Bitmap logoSmall, TextView tv, TextView tvShort, float margin) {
+    this.snapshot = snapshot;
+    this.logo = logo;
+    this.logoSmall = logoSmall;
+    this.textView = tv;
+    this.textViewShort = tvShort;
+    this.margin = margin;
+  }
+
+  public AttributionLayout measure() {
+    Chain chain = new Chain(
+      new FullLogoLongTextCommand(),
+      new FullLogoShortTextCommand(),
+      new SmallLogoLongTextCommand(),
+      new SmallLogoShortTextCommand(),
+      new LongTextCommand(),
+      new ShortTextCommand(),
+      new NoTextCommand()
+    );
+
+    AttributionLayout attributionLayout = chain.start(this);
+    shorterText = attributionLayout.isShortText();
+    return attributionLayout;
+  }
+
+
+  private static class FullLogoLongTextCommand implements Command {
+    public AttributionLayout execute(AttributionMeasure measure) {
+      float width = measure.getLogoContainerWidth() + measure.getTextViewContainerWidth();
+      boolean fitBounds = width <= measure.getMaxSize();
+      if (fitBounds) {
+        PointF anchor = calculateAnchor(measure.snapshot, measure.textView, measure.margin);
+        return new AttributionLayout(measure.logo, anchor, false);
+      }
+      return null;
+    }
+  }
+
+  private static class FullLogoShortTextCommand implements Command {
+    @Override
+    public AttributionLayout execute(AttributionMeasure measure) {
+      float width = measure.getLogoContainerWidth() + measure.getTextViewShortContainerWidth();
+      boolean fitBounds = width <= measure.getMaxSizeShort();
+      if (fitBounds) {
+        PointF anchor = calculateAnchor(measure.snapshot, measure.textViewShort, measure.margin);
+        return new AttributionLayout(measure.logo, anchor, true);
+      }
+      return null;
+    }
+  }
+
+  private static class SmallLogoLongTextCommand implements Command {
+    @Override
+    public AttributionLayout execute(AttributionMeasure measure) {
+      float width = measure.getLogoSmallContainerWidth() + measure.getTextViewContainerWidth();
+      boolean fitBounds = width <= measure.getMaxSize();
+      if (fitBounds) {
+        PointF anchor = calculateAnchor(measure.snapshot, measure.textView, measure.margin);
+        return new AttributionLayout(measure.logoSmall, anchor, false);
+      }
+      return null;
+    }
+  }
+
+  private static class SmallLogoShortTextCommand implements Command {
+    @Override
+    public AttributionLayout execute(AttributionMeasure measure) {
+      float width = measure.getLogoContainerWidth() + measure.getTextViewShortContainerWidth();
+      boolean fitBounds = width <= measure.getMaxSizeShort();
+      if (fitBounds) {
+        PointF anchor = calculateAnchor(measure.snapshot, measure.textViewShort, measure.margin);
+        return new AttributionLayout(measure.logoSmall, anchor, true);
+      }
+      return null;
+    }
+  }
+
+  private static class LongTextCommand implements Command {
+    @Override
+    public AttributionLayout execute(AttributionMeasure measure) {
+      float width = measure.getTextViewContainerWidth() + measure.margin;
+      boolean fitBounds = width <= measure.getMaxSize();
+      if (fitBounds) {
+        return new AttributionLayout(null, calculateAnchor(measure.snapshot, measure.textView, measure.margin), false);
+      }
+      return null;
+    }
+  }
+
+  private static class ShortTextCommand implements Command {
+    @Override
+    public AttributionLayout execute(AttributionMeasure measure) {
+      float width = measure.getTextViewShortContainerWidth() + measure.margin;
+      boolean fitBounds = width <= measure.getMaxSizeShort();
+      if (fitBounds) {
+        PointF anchor = calculateAnchor(measure.snapshot, measure.textViewShort, measure.margin);
+        return new AttributionLayout(null, anchor, true);
+      }
+      return null;
+    }
+  }
+
+  private static class NoTextCommand implements Command {
+    @Override
+    public AttributionLayout execute(AttributionMeasure measure) {
+      return new AttributionLayout(null, null, false);
+    }
+  }
+
+  private static PointF calculateAnchor(Bitmap snapshot, TextView textView, float margin) {
+    return new PointF(
+      snapshot.getWidth() - textView.getMeasuredWidth() - margin,
+      snapshot.getHeight() - margin - textView.getMeasuredHeight()
+    );
+  }
+
+  public TextView getTextView() {
+    return shorterText ? textViewShort : textView;
+  }
+
+  private class Chain {
+    public List<Command> commands;
+
+    Chain(Command... commands) {
+      this.commands = Arrays.asList(commands);
+    }
+
+    public AttributionLayout start(AttributionMeasure measure) {
+      AttributionLayout attributionLayout = null;
+      for (Command command : commands) {
+        attributionLayout = command.execute(measure);
+        if (attributionLayout != null) {
+          break;
+        }
+      }
+      return attributionLayout;
+    }
+  }
+
+  public interface Command {
+    AttributionLayout execute(AttributionMeasure measure);
+  }
+
+  private float getTextViewContainerWidth() {
+    return textView.getMeasuredWidth() + margin;
+  }
+
+  private float getLogoContainerWidth() {
+    return logo.getWidth() + (2 * margin);
+  }
+
+  private  float getTextViewShortContainerWidth() {
+    return textViewShort.getMeasuredWidth() + margin;
+  }
+
+  private float getLogoSmallContainerWidth() {
+    return logoSmall.getWidth() + (2 * margin);
+  }
+
+  private float getMaxSize() {
+    return snapshot.getWidth() * 8 / 10;
+  }
+
+  private float getMaxSizeShort() {
+    return snapshot.getWidth();
+  }
+
+  public static class Builder {
+    private Bitmap snapshot;
+    private Bitmap logo;
+    private Bitmap logoSmall;
+    private TextView textView;
+    private TextView textViewShort;
+    private float marginPadding;
+
+    public Builder setSnapshot(Bitmap snapshot) {
+      this.snapshot = snapshot;
+      return this;
+    }
+
+    public Builder setLogo(Bitmap logo) {
+      this.logo = logo;
+      return this;
+    }
+
+    public Builder setLogoSmall(Bitmap logoSmall) {
+      this.logoSmall = logoSmall;
+      return this;
+    }
+
+    public Builder setTextView(TextView textView) {
+      this.textView = textView;
+      return this;
+    }
+
+    public Builder setTextViewShort(TextView textViewShort) {
+      this.textViewShort = textViewShort;
+      return this;
+    }
+
+    public Builder setMarginPadding(float marginPadding) {
+      this.marginPadding = marginPadding;
+      return this;
+    }
+
+    public AttributionMeasure build() {
+      return new AttributionMeasure(snapshot, logo, logoSmall, textView, textViewShort, marginPadding);
+    }
+  }
+}