358 lines
9.6 KiB
C++
358 lines
9.6 KiB
C++
/*
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* Cantata
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*
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* Copyright (c) 2011-2014 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 "support/localize.h"
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#include <QLabel>
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#include <QScrollBar>
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#include <QImage>
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#include <QGridLayout>
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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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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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return QString("<tr><td align=\"center\"><img src=\"data:image/png;base64,%1\"/></td></tr>").arg(QString(buffer.data().toBase64()));
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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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ViewTextSelector::ViewTextSelector(QWidget *p)
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: QLabel(p)
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, current(0)
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{
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setAttribute(Qt::WA_Hover, true);
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menu=new QMenu(this);
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}
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static QString viewText(const QString &s)
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{
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// 0x25BE is unicode for small down arrow...
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return QLatin1String("<b>")+s+QLatin1String(" ")+QChar(0x25BE)+QLatin1String("</b>");
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}
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void ViewTextSelector::addItem(const QString &t)
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{
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menu->addAction(t, this, SLOT(itemSelected()))->setData(items.count());
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if (text().isEmpty()) {
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setText(viewText(t));
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current=items.count();
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}
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items.append(t);
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}
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void ViewTextSelector::itemSelected()
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{
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QAction *act=qobject_cast<QAction *>(sender());
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if (act) {
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setCurrentIndex(act->data().toInt());
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}
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}
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bool ViewTextSelector::event(QEvent *e)
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{
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switch (e->type()) {
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case QEvent::MouseButtonPress:
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if (Qt::NoModifier==static_cast<QMouseEvent *>(e)->modifiers() && Qt::LeftButton==static_cast<QMouseEvent *>(e)->button()) {
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menu->exec(mapToGlobal(static_cast<QMouseEvent *>(e)->pos()));
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}
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case QEvent::HoverLeave:
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setStyleSheet(QString());
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break;
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case QEvent::HoverEnter:
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setStyleSheet(QLatin1String("QLabel{color:palette(highlight);}"));
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break;
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case QEvent::Wheel: {
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int numDegrees = static_cast<QWheelEvent *>(e)->delta() / 8;
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int numSteps = numDegrees / 15;
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int newIndex = current;
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if (numSteps > 0) {
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for (int i = 0; i < numSteps; ++i) {
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newIndex++;
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if (newIndex>=items.count()) {
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newIndex=0;
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}
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}
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} else {
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for (int i = 0; i > numSteps; --i) {
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newIndex--;
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if (newIndex<0) {
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newIndex=items.count()-1;
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}
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}
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}
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setCurrentIndex(newIndex);
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break;
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}
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default:
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break;
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}
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return QLabel::event(e);
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}
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void ViewTextSelector::setCurrentIndex(int v)
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{
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if (v<0 || v>=items.count() || v==current) {
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return;
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}
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current=v;
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setText(viewText(items.at(current)));
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emit activated(current);
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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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QGridLayout *layout=new QGridLayout(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 ViewTextSelector(this);
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foreach (const QString &v, views) {
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TextBrowser *t=createView(stack);
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selector->addItem(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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layout->setMargin(0);
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header->setWordWrap(true);
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header->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Preferred);
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int row=0;
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layout->addItem(new QSpacerItem(1, layout->spacing(), QSizePolicy::Fixed, QSizePolicy::Fixed), row++, 0);
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layout->addWidget(header, row++, 0, 1, 2);
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if (views.isEmpty()) {
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layout->addWidget(texts.at(0), row++, 0, 1, 2);
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} else {
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layout->addWidget(selector, row, 0);
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layout->addItem(new QSpacerItem(1, 1, QSizePolicy::MinimumExpanding, QSizePolicy::Fixed), row++, 1);
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layout->addWidget(stack, row++, 0, 1, 2);
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}
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layout->addItem(new QSpacerItem(1, fontMetrics().height()/4, QSizePolicy::Fixed, QSizePolicy::Fixed), row++, 0);
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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, i18n("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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header->setText("<"+headerTag+" align=\"center\">"+str+"</"+headerTag+">");
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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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return QString("<tr><td align=\"center\"><img src=\"%1\"/></td></tr>").arg(file);
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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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