org.mariotaku.twidere.view.ProfileBannerImageView.java Source code

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Here is the source code for org.mariotaku.twidere.view.ProfileBannerImageView.java

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/*
 *             Twidere - 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.mariotaku.twidere.view;

import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.LinearGradient;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.Shader;
import android.support.v4.view.ViewCompat;
import android.util.AttributeSet;

import org.mariotaku.twidere.Constants;
import org.mariotaku.twidere.util.ThemeUtils;
import org.mariotaku.twidere.view.iface.IExtendedView;

public class ProfileBannerImageView extends ForegroundImageView implements IExtendedView, Constants {

    private static final int[] COLORS = new int[] { 0xFFFFFFFF, 0x00FFFFFF };
    private static final int[] COLORS_REVERSED = new int[] { 0x00FFFFFF, 0xFFFFFFFF };
    private static final float[] POSITIONS = new float[] { 0.0f, 1.0f };
    private static final PorterDuffXfermode DST_IN = new PorterDuffXfermode(PorterDuff.Mode.DST_IN);
    private final Paint mPaint = new Paint();

    private LinearGradient mShader;
    private OnSizeChangedListener mOnSizeChangedListener;

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

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

    public ProfileBannerImageView(final Context context, final AttributeSet attrs, final int defStyle) {
        super(context, attrs, defStyle);
        if (isInEditMode())
            return;
        ViewCompat.setLayerType(this, LAYER_TYPE_SOFTWARE, null);
        final boolean is_dark_theme = ThemeUtils.isDarkTheme(context);
        COLORS_REVERSED[1] = is_dark_theme ? 0xFF000000 : 0xFFFFFFFF;
        setForeground(ThemeUtils.getImageHighlightDrawable(context));
    }

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

    @Override
    protected void onDraw(final Canvas canvas) {
        if (isInEditMode())
            return;
        final int width = getWidth(), height = getHeight();
        if (mShader == null)
            return;
        super.onDraw(canvas);
        mPaint.setShader(mShader);
        mPaint.setXfermode(DST_IN);
        canvas.drawRect(0, 0, width, height, mPaint);
    }

    @SuppressLint("DrawAllocation")
    @Override
    protected void onMeasure(final int widthMeasureSpec, final int heightMeasureSpec) {
        final int width = MeasureSpec.getSize(widthMeasureSpec), height = width / 2;
        setMeasuredDimension(width, height);
        if (width > 0) {
            mShader = new LinearGradient(width / 2, 0, width / 2, height, COLORS, POSITIONS, Shader.TileMode.CLAMP);
        }
        super.onMeasure(widthMeasureSpec, MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY));
    }

    @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);
        }
    }

}