com.none.tom.simplerssreader.view.ReadMoreTextView.java Source code

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Here is the source code for com.none.tom.simplerssreader.view.ReadMoreTextView.java

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// Copyright (c) 2018, Tom Geiselmann
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of this software
// and associated documentation files (the "Software"), to deal in the Software without restriction,
// including without limitation the rights to use, copy, modify, merge, publish, distribute,
// sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY,WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

package com.none.tom.simplerssreader.view;

import android.content.Context;
import android.content.res.TypedArray;
import android.support.v4.content.ContextCompat;
import android.support.v7.widget.AppCompatTextView;
import android.text.SpannableStringBuilder;
import android.text.Spanned;
import android.text.TextPaint;
import android.text.TextUtils;
import android.text.method.LinkMovementMethod;
import android.text.style.ClickableSpan;
import android.util.AttributeSet;
import android.view.View;

import com.none.tom.simplerssreader.R;

public class ReadMoreTextView extends AppCompatTextView {
    public static final int EMS = 100;

    private CharSequence mText;
    private final int mColor;

    public ReadMoreTextView(final Context context) {
        this(context, null);
    }

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

        final TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.ReadMoreTextView);

        mColor = a.getColor(R.styleable.ReadMoreTextView_readMoreColor,
                ContextCompat.getColor(context, R.color.colorAccent));

        a.recycle();
    }

    @SuppressWarnings("SameParameterValue")
    public void setText(final CharSequence text, final int maxEms) {
        if (!TextUtils.isEmpty(text) && text.length() > maxEms) {
            final SpannableStringBuilder ssb = new SpannableStringBuilder(text.subSequence(0, maxEms));

            ssb.append('\u2026');

            final int textLength = ssb.length();

            ssb.append('\n');
            ssb.append(getContext().getString(R.string.read_more));

            final int readMoreLength = ssb.length() - textLength;

            ssb.setSpan(new ReadMoreClickableSpan(), textLength, textLength + readMoreLength,
                    Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

            super.setText(ssb);

            setMaxEms(maxEms + readMoreLength);
            setMovementMethod(LinkMovementMethod.getInstance());

            mText = text;
        } else {
            super.setText(text);
        }
    }

    private class ReadMoreClickableSpan extends ClickableSpan {
        @Override
        public void onClick(final View view) {
            setText(mText);
            setMaxEms(Integer.MAX_VALUE);
        }

        @Override
        public void updateDrawState(final TextPaint paint) {
            paint.setUnderlineText(false);
            paint.setColor(mColor);
        }
    }
}