HideSpan.java

/*
 * Copyright 2016 Hippo Seven
 *
 * 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.hippo.jsouptest;

/*
 * Created by Hippo on 10/16/2016.
 */

import android.graphics.Color;
import android.text.TextPaint;
import android.text.style.CharacterStyle;
import android.text.style.UpdateAppearance;
import android.view.View;

public class HideSpan extends CharacterStyle implements UpdateAppearance {

    private boolean mUseTextColor;
    private int mColor;
    private boolean mHide;

    /**
     * Create a new HideSpan with text color as hide color and true hide state.
     */
    public HideSpan() {
        this(true, 0, true);
    }

    /**
     * Create a new HideSpan with very text color and true hide state.
     */
    public HideSpan(int color) {
        this(false, color, true);
    }

    /**
     * Create a new HideSpan with text color as hide color and very hide state.
     */
    public HideSpan(boolean hide) {
        this(true, 0, hide);
    }

    /**
     * Create a new HideSpan with very text color and very hide state.
     */
    public HideSpan(int color, boolean hide) {
        this(false, color, hide);
    }

    private HideSpan(boolean useTextColor, int color, boolean hide) {
        mUseTextColor = useTextColor;
        mColor = color;
        mHide = hide;
    }

    /**
     * Set hide state for this HideSpan.
     * <p>
     * Call {@link View#invalidate()} to become effective.
     */
    public void setHide(boolean hide) {
        mHide = hide;
    }

    /**
     * Return hide state of this HideSpan.
     */
    public boolean isHide() {
        return mHide;
    }

    /**
     * Toggle hide state of this HideSpan.
     * <p>
     * Call {@link View#invalidate()} to become effective.
     */
    public boolean toggleHide() {
        return mHide = !mHide;
    }

    /**
     * Set hide color.
     * <p>
     * Call {@link View#invalidate()} to become effective.
     */
    public void setColor(int color) {
        mUseTextColor = false;
        mColor = color;
    }

    /**
     * Use text color as hide color.
     * <p>
     * Call {@link View#invalidate()} to become effective.
     */
    public void useTextColor() {
        mUseTextColor = true;
    }

    @Override
    public void updateDrawState(TextPaint tp) {
        if (mHide) {
            tp.bgColor = mUseTextColor ? tp.getColor() : mColor;
            tp.setColor(Color.TRANSPARENT);
        }
    }
}