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92 lines
3.8 KiB
Java
92 lines
3.8 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.Bitmap;
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import android.graphics.Canvas;
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import android.graphics.Color;
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import android.graphics.Paint;
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import android.graphics.Rect;
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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 SingleTileLayer {
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private static final int BAR_SIZE = 8; // has to be power of 2
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/*
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* This awkward pattern is necessary due to Java's restrictions on when one can call superclass
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* constructors.
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*/
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private ScrollbarLayer(CairoImage image) {
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super(image);
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}
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public static ScrollbarLayer create() {
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Bitmap bitmap = Bitmap.createBitmap(BAR_SIZE, BAR_SIZE, Bitmap.Config.ARGB_8888);
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Canvas canvas = new Canvas(bitmap);
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Paint painter = new Paint();
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painter.setColor(Color.argb(127, 0, 0, 0));
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canvas.drawRect(0.0f, 0.0f, BAR_SIZE, BAR_SIZE, painter);
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return new ScrollbarLayer(new BufferedCairoImage(bitmap));
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}
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void drawVertical(GL10 gl, IntSize screenSize, Rect pageRect) {
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float barStart = (float)screenSize.height * (float)(0 - pageRect.top) / pageRect.height();
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float barEnd = (float)screenSize.height * (float)(screenSize.height - pageRect.top) / pageRect.height();
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float scale = Math.max(1.0f, (barEnd - barStart) / BAR_SIZE);
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gl.glLoadIdentity();
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gl.glScalef(1.0f, scale, 1.0f);
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gl.glTranslatef(screenSize.width - BAR_SIZE, barStart / scale, 0.0f);
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draw(gl);
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}
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void drawHorizontal(GL10 gl, IntSize screenSize, Rect pageRect) {
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float barStart = (float)screenSize.width * (float)(0 - pageRect.left) / pageRect.width();
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float barEnd = (float)screenSize.width * (float)(screenSize.width - pageRect.left) / pageRect.width();
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float scale = Math.max(1.0f, (barEnd - barStart) / BAR_SIZE);
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gl.glLoadIdentity();
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gl.glScalef(scale, 1.0f, 1.0f);
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gl.glTranslatef(barStart / scale, screenSize.height - BAR_SIZE, 0.0f);
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draw(gl);
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}
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}
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