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102 lines
4.0 KiB
Java
102 lines
4.0 KiB
Java
/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Android code.
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*
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* The Initial Developer of the Original Code is Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2011
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Kartikaya Gupta <kgupta@mozilla.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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package org.mozilla.gecko.gfx;
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import android.graphics.PointF;
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import android.graphics.RectF;
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import android.opengl.GLES11;
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import android.opengl.GLES11Ext;
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import android.util.Log;
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import java.nio.ByteBuffer;
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import javax.microedition.khronos.opengles.GL10;
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/**
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* Draws a small rect. This is scaled to become a scrollbar.
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*/
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public class ScrollbarLayer extends TileLayer {
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private static final int BAR_SIZE = 8; // has to be power of 2
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private final boolean mVertical;
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private ScrollbarLayer(CairoImage image, boolean vertical) {
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super(false, image);
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mVertical = vertical;
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}
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public static ScrollbarLayer create(boolean vertical) {
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ByteBuffer buffer = ByteBuffer.allocateDirect(4);
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buffer.put(3, (byte)127); // Set A to 0.5; leave R/G/B at 0.
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CairoImage image = new BufferedCairoImage(buffer, 1, 1, CairoImage.FORMAT_ARGB32);
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return new ScrollbarLayer(image, vertical);
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}
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@Override
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public void draw(RenderContext context) {
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if (!initialized())
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return;
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try {
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GLES11.glEnable(GL10.GL_BLEND);
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RectF rect = mVertical ? getVerticalRect(context) : getHorizontalRect(context);
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GLES11.glBindTexture(GL10.GL_TEXTURE_2D, getTextureID());
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float y = context.viewport.height() - rect.bottom;
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GLES11Ext.glDrawTexfOES(rect.left, y, 0.0f, rect.width(), rect.height());
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} finally {
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GLES11.glDisable(GL10.GL_BLEND);
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}
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}
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private RectF getVerticalRect(RenderContext context) {
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RectF viewport = context.viewport;
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FloatSize pageSize = context.pageSize;
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float barStart = viewport.height() * viewport.top / pageSize.height;
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float barEnd = viewport.height() * viewport.bottom / pageSize.height;
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return new RectF(viewport.width() - BAR_SIZE, barStart, viewport.width(), barEnd);
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}
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private RectF getHorizontalRect(RenderContext context) {
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RectF viewport = context.viewport;
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FloatSize pageSize = context.pageSize;
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float barStart = viewport.width() * viewport.left / pageSize.width;
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float barEnd = viewport.width() * viewport.right / pageSize.width;
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return new RectF(barStart, viewport.height() - BAR_SIZE, barEnd, viewport.height());
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}
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}
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