291 lines
8.0 KiB
C++
291 lines
8.0 KiB
C++
/*
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* Cantata
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*
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* Copyright (c) 2011-2017 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 "view.h"
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#include "support/spinner.h"
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#include "network/networkaccessmanager.h"
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#include "gui/settings.h"
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#include "widgets/textbrowser.h"
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#include "support/gtkstyle.h"
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#include "support/actioncollection.h"
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#include "support/action.h"
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#include "widgets/icons.h"
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#include <QLabel>
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#include <QScrollBar>
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#include <QImage>
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#include <QVBoxLayout>
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#include <QNetworkReply>
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#include <QLocale>
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#include <QBuffer>
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#include <QFile>
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#include <QStackedWidget>
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#include <QComboBox>
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#include <QMenu>
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#include <QMouseEvent>
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#include <QWheelEvent>
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#include <QTimer>
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// Uncomment this #define to have header labels an images centered. Thsi is disabled, as the image
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// centering only works if there is some text larger than 1 line to be displayed underneath :-(
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//#define CONTEXT_CENTERED
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static QString headerTag;
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QString View::subTag;
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QString View::encode(const QImage &img)
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{
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QByteArray bytes;
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QBuffer buffer(&bytes);
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buffer.open(QIODevice::WriteOnly);
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img.save(&buffer, "PNG");
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#ifdef CONTEXT_CENTERED
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return QString("<tr><td align=\"center\"><img src=\"data:image/png;base64,%1\"/></td></tr>").arg(QString(buffer.data().toBase64()));
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#else
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return QString("<img src=\"data:image/png;base64,%1\"/>").arg(QString(buffer.data().toBase64()));
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#endif
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}
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void View::initHeaderTags()
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{
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bool small=Settings::self()->wikipediaIntroOnly() ;
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headerTag=small ? "h2" : "h1";
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subTag=small ? "h3" : "h2";
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}
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static TextBrowser * createView(QWidget *parent)
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{
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TextBrowser *text=new TextBrowser(parent);
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if (GtkStyle::isActive()) {
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text->verticalScrollBar()->setAttribute(Qt::WA_OpaquePaintEvent, false);
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}
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text->setOpenLinks(false);
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text->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
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text->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::MinimumExpanding);
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text->setFrameShape(QFrame::NoFrame);
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text->setReadOnly(true);
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text->viewport()->setAutoFillBackground(false);
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return text;
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}
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View::View(QWidget *parent, const QStringList &views)
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: QWidget(parent)
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, needToUpdate(false)
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, spinner(0)
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, selector(0)
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, stack(0)
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{
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QVBoxLayout *layout=new QVBoxLayout(this);
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header=new QLabel(this);
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if (views.isEmpty()) {
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TextBrowser *t=createView(this);
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texts.append(t);
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} else {
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stack=new QStackedWidget(this);
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selector=new SelectorLabel(this);
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selector->setUseArrow(true);
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foreach (const QString &v, views) {
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TextBrowser *t=createView(stack);
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selector->addItem(v, v);
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stack->addWidget(t);
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texts.append(t);
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}
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connect(selector, SIGNAL(activated(int)), stack, SLOT(setCurrentIndex(int)));
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connect(selector, SIGNAL(activated(int)), this, SIGNAL(viewChanged()));
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}
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header->setWordWrap(true);
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header->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Preferred);
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header->setTextInteractionFlags(Qt::TextSelectableByMouse|Qt::TextSelectableByKeyboard);
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layout->setMargin(2);
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layout->addWidget(header);
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if (views.isEmpty()) {
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layout->addWidget(texts.at(0));
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} else {
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layout->addWidget(selector);
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layout->addItem(new QSpacerItem(1, 1, QSizePolicy::MinimumExpanding, QSizePolicy::Fixed));
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layout->addWidget(stack);
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}
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layout->addItem(new QSpacerItem(1, fontMetrics().height()/4, QSizePolicy::Fixed, QSizePolicy::Fixed));
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if (headerTag.isEmpty()) {
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initHeaderTags();
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}
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cancelJobAction=new Action(Icons::self()->cancelIcon, tr("Cancel"), this);
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cancelJobAction->setEnabled(false);
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connect(cancelJobAction, SIGNAL(triggered()), SLOT(abort()));
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text=texts.at(0);
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}
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View::~View()
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{
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abort();
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}
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void View::clear()
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{
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setHeader(stdHeader);
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foreach (TextBrowser *t, texts) {
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t->clear();
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}
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}
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void View::setHeader(const QString &str)
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{
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#ifdef CONTEXT_CENTERED
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header->setText("<"+headerTag+" align=\"center\">"+str+"</"+headerTag+">");
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#else
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header->setText("<"+headerTag+">"+str+"</"+headerTag+">");
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#endif
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}
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void View::setPicSize(const QSize &sz)
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{
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foreach (TextBrowser *t, texts) {
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t->setPicSize(sz);
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}
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}
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QSize View::picSize() const
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{
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return text->picSize();
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}
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QString View::createPicTag(const QImage &img, const QString &file)
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{
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if (!file.isEmpty() && QFile::exists(file)) {
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#ifdef CONTEXT_CENTERED
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return QString("<tr><td align=\"center\"><img src=\"%1\"/></td></tr>").arg(file);
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#else
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return QString("<img src=\"%1\"/>").arg(file);
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#endif
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}
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if (img.isNull()) {
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return QString();
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}
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// No filename given, or file does not exist - therefore encode & scale image.
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return encode(img.scaled(texts.at(0)->picSize(), Qt::KeepAspectRatio, Qt::SmoothTransformation));
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}
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void View::showEvent(QShowEvent *e)
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{
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if (needToUpdate) {
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update(currentSong, true);
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}
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needToUpdate=false;
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QWidget::showEvent(e);
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}
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void View::showSpinner(bool enableCancel)
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{
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if (!spinner) {
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spinner=new Spinner(this);
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spinner->setWidget(this);
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}
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if (!spinner->isActive()) {
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spinner->start();
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if (enableCancel) {
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cancelJobAction->setEnabled(true);
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}
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}
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}
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void View::hideSpinner(bool disableCancel)
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{
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if (spinner) {
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spinner->stop();
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if (disableCancel) {
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cancelJobAction->setEnabled(false);
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}
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}
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}
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void View::setEditable(bool e, int index)
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{
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TextBrowser *t=texts.at(index);
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t->setReadOnly(!e);
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t->viewport()->setAutoFillBackground(e);
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}
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void View::setPal(const QPalette &pal, const QColor &linkColor, const QColor &prevLinkColor)
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{
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foreach (TextBrowser *t, texts) {
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// QTextBrowser seems to save link colour within the HTML, so we need to manually
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// update this when the palette changes!
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QString old=t->toHtml();
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t->setPal(pal);
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old=old.replace("color:"+prevLinkColor.name()+";", "color:"+linkColor.name()+";");
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t->setHtml(old);
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}
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// header uses window/button text - so need to set these now...
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QPalette hdrPal=pal;
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hdrPal.setColor(QPalette::WindowText, pal.color(QPalette::Text));
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hdrPal.setColor(QPalette::ButtonText, pal.color(QPalette::Text));
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header->setPalette(hdrPal);
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if (selector) {
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selector->setPalette(hdrPal);
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}
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}
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void View::addEventFilter(QObject *obj)
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{
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installEventFilter(obj);
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foreach (TextBrowser *t, texts) {
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t->installEventFilter(obj);
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t->viewport()->installEventFilter(obj);
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}
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header->installEventFilter(obj);
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}
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void View::setZoom(int z)
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{
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foreach (TextBrowser *t, texts) {
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t->setZoom(z);
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}
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QFont f=header->font();
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f.setPointSize(f.pointSize()+z);
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header->setFont(f);
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if (selector) {
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QFont f=selector->font();
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f.setPointSize(f.pointSize()+z);
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selector->setFont(f);
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}
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}
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int View::getZoom()
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{
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return text->zoom();
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}
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void View::setHtml(const QString &h, int index)
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{
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texts.at(index)->setText(QLatin1String("<html><head><style type=text/css>a:link {color:")+text->palette().link().color().name()+
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QLatin1String("; text-decoration:underline;}</style></head><body>")+h+QLatin1String("</body></html>"));
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}
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void View::abort()
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{
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}
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