/*
 * 				Firetweet - Twitter client for Android
 * 
 *  Copyright (C) 2012-2014 Mariotaku Lee <mariotaku.lee@gmail.com>
 * 
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 * 
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 * 
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.getlantern.firetweet.view;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.widget.FrameLayout;

import org.getlantern.firetweet.util.ThemeUtils;
import org.getlantern.firetweet.util.accessor.ViewAccessor;

public class RightDrawerFrameLayout extends FrameLayout {

    private final Paint mClipPaint = new Paint();
    private float mScrollScale, mPercentOpen;
    private boolean mClipEnabled;

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

    public RightDrawerFrameLayout(final Context context, final AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public RightDrawerFrameLayout(final Context context, final AttributeSet attrs, final int defStyle) {
        super(context, attrs, defStyle);
        final Drawable bg = ThemeUtils.getWindowBackground(context, ThemeUtils.getDrawerThemeResource(context));
        ViewAccessor.setBackground(this, bg);
        setWillNotDraw(false);
        mClipPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));
    }

    @Override
    public boolean hasOverlappingRendering() {
        return mClipEnabled;
    }

    public void setClipEnabled(final boolean clipEnabled) {
        mClipEnabled = clipEnabled;
        if (!clipEnabled) {
            setAlpha(1);
        }
    }

    public void setPercentOpen(final float percentOpen) {
        if (mPercentOpen == percentOpen) return;
        mPercentOpen = percentOpen;
        if (mClipEnabled) {
            setAlpha(1 - (1 - mPercentOpen) * (1.0f / 0xff));
            invalidate();
        }
    }

    public void setScrollScale(final float scrollScale) {
        mScrollScale = scrollScale;
    }

    @Override
    protected void dispatchDraw(final Canvas canvas) {
        super.dispatchDraw(canvas);
        if (mClipEnabled && mPercentOpen > 0 && mPercentOpen < 1) {
            final int right = Math.round(getWidth() * (1 - mPercentOpen) * (1 - mScrollScale));
            canvas.drawRect(getLeft(), getTop(), right, getBottom(), mClipPaint);
        }
    }
}