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/*
* 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 android.support.annotation.Nullable;
import android.text.TextPaint;
import android.text.style.ClickableSpan;
import android.util.Log;
import android.view.View;
/**
* A clickable span that will listen for click events and send it back to the context. To use this
* class, implement {@link com.android.setupwizardlib.span.LinkSpan.OnClickListener} in your
* context (typically your Activity).
*
* <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);
public interface OnClickListener {
void onClick(LinkSpan span);
}
/* non-static section */
private final String mId;
public LinkSpan(String id) {
mId = id;
}
@Override
public void onClick(View view) {
final OnClickListener listener = getListenerFromContext(view.getContext());
if (listener != null) {
listener.onClick(this);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
view.cancelPendingInputEvents();
}
} else {
Log.w(TAG, "Dropping click event. No listener attached.");
}
}
@Nullable
private OnClickListener getListenerFromContext(@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 mId;
}
}
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