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

// Copyright 2010-2014, Google Inc.
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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.DummyDrawable;
import org.mozc.android.inputmethod.japanese.view.Skin;
import com.google.common.base.Preconditions;

import android.content.Context;
import android.content.res.Resources;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.widget.ToggleButton;

/**
 * View class for the button to expand/fold conversion candidate view.
 *
 */
public class InputFrameFoldButtonView extends ToggleButton {

  private static final int[] STATE_EMPTY = {};
  private static final int[] STATE_CHECKED = { android.R.attr.state_checked };

  private Drawable arrowDrawable = DummyDrawable.getInstance();
  private Drawable backgroundDefaultDrawable = DummyDrawable.getInstance();
  private Drawable backgroundScrolledDrawable = DummyDrawable.getInstance();
  private boolean showBackgroundForScrolled = false;

  public InputFrameFoldButtonView(Context context) {
    super(context);
  }

  public InputFrameFoldButtonView(Context context, AttributeSet attributeSet) {
    super(context, attributeSet);
  }

  public InputFrameFoldButtonView(Context context, AttributeSet attributeSet, int defStyle) {
    super(context, attributeSet, defStyle);
  }

  @Override
  protected void onFinishInflate() {
    super.onFinishInflate();
    setBackgroundColor(Color.TRANSPARENT);
  }

  @Override
  protected void onSizeChanged(int width, int height, int oldWidth, int oldHeight) {
    super.onSizeChanged(width, height, oldWidth, oldHeight);
    backgroundDefaultDrawable.setBounds(0, 0, width, height);
    backgroundScrolledDrawable.setBounds(0, 0, width, height);
    arrowDrawable.setBounds(0, 0, width, height);
  }

  @Override
  protected void drawableStateChanged() {
    super.drawableStateChanged();
    arrowDrawable.setState(isChecked() ? STATE_CHECKED : STATE_EMPTY);
    invalidate();
  }

  @Override
  protected void onDraw(Canvas canvas) {
    Drawable background =
        showBackgroundForScrolled ? backgroundScrolledDrawable : backgroundDefaultDrawable;
    background.draw(canvas);
    arrowDrawable.draw(canvas);
  }

  public void setSkin(Skin skin) {
    Preconditions.checkNotNull(skin);
    Resources resources = getResources();
    arrowDrawable = skin.getDrawable(resources, R.raw.keyboard__fold__tab)
        .getConstantState().newDrawable();
    arrowDrawable.setBounds(0, 0, getWidth(), getHeight());
    backgroundDefaultDrawable =
        skin.getDrawable(resources, R.raw.keyboard_fold_tab_background_default)
            .getConstantState().newDrawable();
    backgroundDefaultDrawable.setBounds(0, 0, getWidth(), getHeight());
    backgroundScrolledDrawable =
        skin.getDrawable(resources, R.raw.keyboard_fold_tab_background_scrolled)
            .getConstantState().newDrawable();
    backgroundScrolledDrawable.setBounds(0, 0, getWidth(), getHeight());
    invalidate();
  }

  public void showBackgroundForScrolled(boolean showBackgroundForScrolled) {
    if (this.showBackgroundForScrolled != showBackgroundForScrolled) {
      this.showBackgroundForScrolled = showBackgroundForScrolled;
      invalidate();
    }
  }
}