StatusTextView.java

package org.getlantern.firetweet.view;

import android.content.Context;
import android.graphics.Rect;
import android.support.annotation.NonNull;
import android.text.SpannableString;
import android.util.AttributeSet;
import android.view.MotionEvent;

import org.getlantern.firetweet.view.iface.IExtendedView;
import org.getlantern.firetweet.view.themed.ThemedTextView;

public class StatusTextView extends ThemedTextView implements IExtendedView {

    private TouchInterceptor mTouchInterceptor;
    private OnSizeChangedListener mOnSizeChangedListener;
    private OnSelectionChangeListener mOnSelectionChangeListener;
    private OnFitSystemWindowsListener mOnFitSystemWindowsListener;

    public StatusTextView(final Context context) {
        super(context);
    }

    public StatusTextView(final Context context, final AttributeSet attrs) {
        super(context, attrs);
    }

    public StatusTextView(final Context context, final AttributeSet attrs, final int defStyle) {
        super(context, attrs, defStyle);
    }

    @Override
    public void setOnFitSystemWindowsListener(OnFitSystemWindowsListener listener) {
        mOnFitSystemWindowsListener = listener;
    }

    @Override
    public final void setOnSizeChangedListener(final OnSizeChangedListener listener) {
        mOnSizeChangedListener = listener;
    }

    @Override
    public final void setTouchInterceptor(final TouchInterceptor listener) {
        mTouchInterceptor = listener;
    }

    public void setOnSelectionChangeListener(final OnSelectionChangeListener l) {
        mOnSelectionChangeListener = l;
    }

    @Override
    protected boolean fitSystemWindows(@NonNull Rect insets) {
        if (mOnFitSystemWindowsListener != null) {
            mOnFitSystemWindowsListener.onFitSystemWindows(insets);
        }
        return super.fitSystemWindows(insets);
    }

    @Override
    public final boolean dispatchTouchEvent(@NonNull final MotionEvent event) {
        if (mTouchInterceptor != null) {
            final boolean ret = mTouchInterceptor.dispatchTouchEvent(this, event);
            if (ret) return true;
        }
        return super.dispatchTouchEvent(event);
    }

    @Override
    protected final void onSizeChanged(final int w, final int h, final int oldw, final int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        if (mOnSizeChangedListener != null) {
            mOnSizeChangedListener.onSizeChanged(this, w, h, oldw, oldh);
        }
    }

    @Override
    protected void onSelectionChanged(final int selStart, final int selEnd) {
        super.onSelectionChanged(selStart, selEnd);
        if (mOnSelectionChangeListener != null) {
            mOnSelectionChangeListener.onSelectionChanged(selStart, selEnd);
        }
    }

    @Override
    public void setText(CharSequence text, BufferType type) {
        if (text == null) {
            super.setText(null, type);
            return;
        }
        super.setText(new SafeSpannableStringWrapper(text), type);
    }

    private static class SafeSpannableStringWrapper extends SpannableString {

        public SafeSpannableStringWrapper(CharSequence source) {
            super(source);
        }

        @Override
        public void setSpan(Object what, int start, int end, int flags) {
            if (start < 0 || end < 0) {
                // Silently ignore
                return;
            }
            super.setSpan(what, start, end, flags);
        }
    }

    @Override
    public final boolean onTouchEvent(@NonNull final MotionEvent event) {
        if (mTouchInterceptor != null) {
            final boolean ret = mTouchInterceptor.onTouchEvent(this, event);
            if (ret) return true;
        }
        return super.onTouchEvent(event);
    }

    public interface OnSelectionChangeListener {
        void onSelectionChanged(int selStart, int selEnd);
    }

}