146 lines
4.2 KiB
C++
146 lines
4.2 KiB
C++
/*
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* Cantata
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*
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* Copyright (c) 2011-2013 Craig Drummond <craig.p.drummond@gmail.com>
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*
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* ----
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#include "textbrowser.h"
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#include <QPainter>
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#include <QDebug>
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static int border=-1;
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static int minSize=-1;
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static int maxSize=-1;
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static void fadeEdges(QImage &img, int edgeSize)
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{
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unsigned char *data=img.bits();
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int width=img.width()*4;
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int height=img.height();
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for (int i=0; i<edgeSize; ++i) {
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int alpha=((i+1.0)/(edgeSize*1.0))*255;
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int offset=i*img.bytesPerLine();
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for(int column=i*4; column<width; column+=4) {
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#if Q_BYTE_ORDER == Q_BIG_ENDIAN
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// ARGB
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data[offset+column] = alpha;
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#else
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// BGRA
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data[offset+column+3] = alpha;
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#endif
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}
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offset=img.bytesPerLine()*(height-1);
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for(int column=i*4; column<width; column+=4) {
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#if Q_BYTE_ORDER == Q_BIG_ENDIAN
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// ARGB
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data[offset+column] = alpha;
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#else
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// BGRA
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data[offset+column+3] = alpha;
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#endif
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}
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for (int j=i; j<height; ++j) {
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offset=(img.bytesPerLine()*j)+(i*4);
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#if Q_BYTE_ORDER == Q_BIG_ENDIAN
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// ARGB
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data[offset] = alpha;
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#else
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// BGRA
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data[offset+3] = alpha;
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#endif
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offset=img.bytesPerLine()*j;
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#if Q_BYTE_ORDER == Q_BIG_ENDIAN
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// ARGB
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data[offset+(width-4)] = alpha;
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#else
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// BGRA
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data[offset+3+(width-4)] = alpha;
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#endif
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}
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width-=4;
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height--;
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}
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}
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TextBrowser::TextBrowser(QWidget *p)
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: QTextBrowser(p)
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, drawImage(false)
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{
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orig=font().pointSize();
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if (-1==minSize) {
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minSize=fontMetrics().height()*18;
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minSize=(((int)(minSize/100))*100)+(minSize%100 ? 100 : 0);
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maxSize=minSize*2;
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border=minSize/4;
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}
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}
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void TextBrowser::setImage(const QImage &img)
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{
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if (drawImage && (!img.isNull() || (img.isNull()!=image.isNull()))) {
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image=img;
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if (!image.isNull()) {
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if (image.width()<minSize || image.height()<minSize) {
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image=image.scaled(QSize(minSize, minSize), Qt::KeepAspectRatio, Qt::SmoothTransformation);
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} else if (image.width()>maxSize || image.height()>maxSize) {
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image=image.scaled(QSize(maxSize, maxSize), Qt::KeepAspectRatio, Qt::SmoothTransformation);
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}
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image=image.convertToFormat(QImage::Format_ARGB32);
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fadeEdges(image, border);
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}
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viewport()->update();
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}
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}
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void TextBrowser::enableImage(bool e)
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{
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if (e!=drawImage) {
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drawImage=e;
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if (!drawImage) {
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image=QImage();
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}
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if (e) {
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viewport()->setAutoFillBackground(false);
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}
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viewport()->update();
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}
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}
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void TextBrowser::paintEvent(QPaintEvent *e)
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{
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if (drawImage && isReadOnly() && !image.isNull()) {
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QPainter p(viewport());
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p.setOpacity(0.15);
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// QRect r(rect());
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// int xpos=r.x()+(r.width()>image.width() ? ((r.width()-image.width())/2) : 0);
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// int ypos=r.y()+(r.height()>image.height() ? ((r.height()-image.height())/2) : 0);
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// p.drawImage(xpos, ypos, image);
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p.fillRect(rect(), QBrush(image));
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} else if (!viewport()->autoFillBackground()) {
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QPainter p(viewport());
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p.fillRect(rect(), viewport()->palette().base());
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}
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QTextBrowser::paintEvent(e);
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}
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