src/android/src/com/google/android/inputmethod/japanese/ui/SideFrameStubProxy.java

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package org.mozc.android.inputmethod.japanese.ui;

import org.mozc.android.inputmethod.japanese.resources.R;
import org.mozc.android.inputmethod.japanese.view.MozcDrawableFactory;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Optional;
import com.google.common.base.Preconditions;

import android.content.res.Resources;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.GradientDrawable;
import android.graphics.drawable.GradientDrawable.Orientation;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.view.ViewStub;
import android.view.ViewStub.OnInflateListener;
import android.view.animation.Animation;
import android.widget.FrameLayout;
import android.widget.ImageView;

/**
 * Proxy between ViewStub and left/right frame.
 * left/right frame is inflated when mozcview needs.
 * SideFrameStubProxy caches and adapts each parameter.
 *
 */
public class SideFrameStubProxy {

  @VisibleForTesting public boolean inflated = false;

  private Optional<View> currentView = Optional.absent();

  private Optional<ImageView> adjustButton = Optional.absent();
  private int inputFrameHeight = 0;
  private Optional<OnClickListener> buttonOnClickListener = Optional.absent();

  private Optional<View> dropshadowShort = Optional.absent();
  private Optional<View> dropshadowLong = Optional.absent();
  private int dropShadowShortVisibility = View.GONE;
  private int dropShadowShortLayoutHeight = 0;
  private int dropShadowLongLayoutHeight = 0;

  private static void setLayoutHeight(View view, int height) {
    ViewGroup.LayoutParams layoutParams = view.getLayoutParams();
    layoutParams.height = height;
    view.setLayoutParams(layoutParams);
  }

  private static Drawable createDropShadowGradientDrawable(
      int startColor, int endColor, float radius, float centerX, float centerY) {
    GradientDrawable gradientDrawable =
        new GradientDrawable(Orientation.TL_BR, new int[]{startColor, endColor});
    gradientDrawable.setGradientType(GradientDrawable.RADIAL_GRADIENT);
    gradientDrawable.setGradientRadius(radius);
    gradientDrawable.setGradientCenter(centerX, centerY);
    return gradientDrawable;
  }

  public void initialize(View view, int stubId, final int dropShadowShortTopId,
                         final int dropShadowLongTopId, final int adjustButtonId,
                         final int adjustButtonResouceId, final float dropShadowGradientCenterX,
                         final int dropshadowShortId,
                         final int dropshadowLongId) {
    ViewStub viewStub = ViewStub.class.cast(view.findViewById(stubId));
    currentView = Optional.<View>of(viewStub);

    viewStub.setOnInflateListener(new OnInflateListener() {

      @SuppressWarnings("deprecation")
      @Override
      public void onInflate(ViewStub stub, View view) {
        inflated = true;

        currentView = Optional.of(view);
        currentView.get().setVisibility(View.VISIBLE);
        dropshadowShort = Optional.of(view.findViewById(dropshadowShortId));
        dropshadowLong = Optional.of(view.findViewById(dropshadowLongId));
        adjustButton = Optional.of(ImageView.class.cast(view.findViewById(adjustButtonId)));
        adjustButton.get().setOnClickListener(buttonOnClickListener.orNull());
        Resources resources = view.getResources();
        MozcDrawableFactory drawableFactory = new MozcDrawableFactory(resources);
        adjustButton.get().setImageDrawable(
            drawableFactory.getDrawable(adjustButtonResouceId).orNull());

        // Create dropshadow corner drawable.
        // Because resource xml cannot set gradientRadius in dip style, code it.
        int startColor = resources.getColor(R.color.dropshadow_start);
        int endColor = resources.getColor(R.color.dropshadow_end);
        float radius = resources.getDimensionPixelSize(R.dimen.translucent_border_height);
        Drawable gradientTop = createDropShadowGradientDrawable(startColor, endColor, radius,
                                                                dropShadowGradientCenterX, 1.0f);
        view.findViewById(dropShadowShortTopId).setBackgroundDrawable(gradientTop);
        view.findViewById(dropShadowLongTopId).setBackgroundDrawable(gradientTop);

        resetAdjustButtonBottomMarginInternal(inputFrameHeight);
        flipDropShadowVisibilityInternal(dropShadowShortVisibility);
        setDropShadowHeightInternal(dropShadowShortLayoutHeight, dropShadowLongLayoutHeight);
      }
    });
  }

  public void setButtonOnClickListener(OnClickListener onClickListener) {
    buttonOnClickListener = Optional.of(Preconditions.checkNotNull(onClickListener));
  }

  public void setFrameVisibility(int visibility) {
    if (currentView.isPresent()) {
      currentView.get().setVisibility(visibility);
    }
  }

  private void resetAdjustButtonBottomMarginInternal(int inputFrameHeight) {
    if (adjustButton.isPresent()) {
      ImageView imageView = ImageView.class.cast(adjustButton.get());
      FrameLayout.LayoutParams layoutParams = FrameLayout.LayoutParams.class.cast(
          imageView.getLayoutParams());
      layoutParams.bottomMargin = (inputFrameHeight - layoutParams.height) / 2;
      imageView.setLayoutParams(layoutParams);
    }
  }

  public void resetAdjustButtonBottomMargin(int inputFrameHeight) {
    if (inflated) {
      resetAdjustButtonBottomMarginInternal(inputFrameHeight);
    }
    this.inputFrameHeight = inputFrameHeight;
  }

  private void flipDropShadowVisibilityInternal(int shortVisibility) {
    if (dropshadowShort.isPresent() && dropshadowLong.isPresent()) {
      dropshadowShort.get().setVisibility(shortVisibility);
      dropshadowLong.get().setVisibility(
          shortVisibility == View.VISIBLE ? View.INVISIBLE : View.VISIBLE);
    }
  }

  public void flipDropShadowVisibility(int shortVisibility) {
    if (inflated) {
      flipDropShadowVisibilityInternal(shortVisibility);
      return;
    }
    dropShadowShortVisibility = shortVisibility;
  }

  private void setDropShadowHeightInternal(int shortHeight, int longHeight) {
    if (dropshadowShort.isPresent() && dropshadowLong.isPresent()) {
      setLayoutHeight(dropshadowShort.get(), shortHeight);
      setLayoutHeight(dropshadowLong.get(), longHeight);
    }
  }

  public void setDropShadowHeight(int shortHeight, int longHeight) {
    if (inflated) {
      setDropShadowHeightInternal(shortHeight, longHeight);
      return;
    }
    dropShadowShortLayoutHeight = shortHeight;
    dropShadowLongLayoutHeight = longHeight;
  }

  public void startDropShadowAnimation(Animation shortAnimation, Animation longAnimation) {
    if (inflated && dropshadowShort.isPresent() && dropshadowLong.isPresent()) {
      dropshadowShort.get().startAnimation(Preconditions.checkNotNull(shortAnimation));
      dropshadowLong.get().startAnimation(Preconditions.checkNotNull(longAnimation));
    }
  }
}