content: /*
   * Copyright (C) 2016 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package com.android.setupwizardlib.span;
  
  import android.content.Context;
  import android.content.ContextWrapper;
  import android.graphics.Typeface;
  import android.os.Build;
  import androidx.annotation.Nullable;
  import android.text.Selection;
  import android.text.Spannable;
  import android.text.TextPaint;
  import android.text.style.ClickableSpan;
  import android.util.Log;
  import android.view.View;
  import android.widget.TextView;
  
  /**
   * A clickable span that will listen for click events and send it back to the context. To use this
   * class, implement {@link OnLinkClickListener} in your TextView, or use {@link
   * com.android.setupwizardlib.view.RichTextView#setOnClickListener(View.OnClickListener)}.
   *
   * <p>Note on accessibility: For TalkBack to be able to traverse and interact with the links, you
   * should use {@code LinkAccessibilityHelper} in your {@code TextView} subclass. Optionally you can
   * also use {@code RichTextView}, which includes link support.
   */
  public class LinkSpan extends ClickableSpan {
  
    /*
     * Implementation note: When the orientation changes, TextView retains a reference to this span
     * instead of writing it to a parcel (ClickableSpan is not Parcelable). If this class has any
     * reference to the containing Activity (i.e. the activity context, or any views in the
     * activity), it will cause memory leak.
     */
  
    /* static section */
  
    private static final String TAG = "LinkSpan";
  
    private static final Typeface TYPEFACE_MEDIUM =
        Typeface.create("sans-serif-medium", Typeface.NORMAL);
  
    /** @deprecated Use {@link OnLinkClickListener} */
    @Deprecated
    public interface OnClickListener {
      void onClick(LinkSpan span);
    }
  
    /**
     * Listener that is invoked when a link span is clicked. If the containing view of this span
     * implements this interface, this will be invoked when the link is clicked.
     */
    public interface OnLinkClickListener {
  
      /**
       * Called when a link has been clicked.
       *
       * @param span The span that was clicked.
       * @return True if the click was handled, stopping further propagation of the click event.
       */
      boolean onLinkClick(LinkSpan span);
    }
  
    /* non-static section */
  
    private final String id;
  
    public LinkSpan(String id) {
      this.id = id;
    }
  
    @Override
    public void onClick(View view) {
      if (dispatchClick(view)) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
          // Prevent the touch event from bubbling up to the parent views.
          view.cancelPendingInputEvents();
        }
      } else {
        Log.w(TAG, "Dropping click event. No listener attached.");
      }
      if (view instanceof TextView) {
        // Remove the highlight effect when the click happens by clearing the selection
        CharSequence text = ((TextView) view).getText();
        if (text instanceof Spannable) {
          Selection.setSelection((Spannable) text, 0);
        }
      }
    }
  
    private boolean dispatchClick(View view) {
      boolean handled = false;
      if (view instanceof OnLinkClickListener) {
        handled = ((OnLinkClickListener) view).onLinkClick(this);
      }
      if (!handled) {
        final OnClickListener listener = getLegacyListenerFromContext(view.getContext());
        if (listener != null) {
          listener.onClick(this);
          handled = true;
        }
      }
      return handled;
    }
  
    /** @deprecated Deprecated together with {@link OnClickListener} */
    @Nullable
    @Deprecated
    private OnClickListener getLegacyListenerFromContext(@Nullable Context context) {
      while (true) {
        if (context instanceof OnClickListener) {
          return (OnClickListener) context;
        } else if (context instanceof ContextWrapper) {
          // Unwrap any context wrapper, in base the base context implements onClickListener.
          // ContextWrappers cannot have circular base contexts, so at some point this will
          // reach the one of the other cases and return.
          context = ((ContextWrapper) context).getBaseContext();
        } else {
          return null;
        }
      }
    }
  
    @Override
    public void updateDrawState(TextPaint drawState) {
      super.updateDrawState(drawState);
      drawState.setUnderlineText(false);
      drawState.setTypeface(TYPEFACE_MEDIUM);
    }
  
    public String getId() {
      return id;
    }
  }
  