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Help: Add litehtml based viewer backend

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For CMake add litehtml installation path to CMAKE_PREFIX_PATH
For qmake pass litehtml installation path via LITEHTML_INSTALL_DIR qmake
variable

Release build of litehtml is recommended.

The litehtml backend is used by default when available, you can force
QTextBrowser again with the environment variable
"QTC_HELPVIEWER_BACKEND=textbrowser".

Some things are not implemented yet:
- Text search
- Context menu
- Shift-drag to extend existing selection

Change-Id: I79f989e5fe2063de2e9832abbed19b24d7a1a1fe
Reviewed-by: hjk <hjk@qt.io>
This commit is contained in:
Eike Ziller
2019-07-29 15:30:58 +02:00
parent 7855c9bb80
commit 0efd65e07e
12 changed files with 2456 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
src/plugins/help/CMakeLists.txt
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@@ -47,3 +47,16 @@ extend_qtc_plugin(Help
webenginehelpviewer.cpp webenginehelpviewer.cpp
webenginehelpviewer.h webenginehelpviewer.h
) )
find_package(litehtml QUIET)
if (TARGET litehtml)
add_subdirectory(qlitehtml)
extend_qtc_plugin(Help
CONDITION TARGET qlitehtml
DEPENDS qlitehtml
DEFINES QTC_LITEHTML_HELPVIEWER
SOURCES
litehtmlhelpviewer.cpp
litehtmlhelpviewer.h
)
endif()

6
src/plugins/help/help.pro
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@@ -78,6 +78,12 @@ osx {
} }
} }
!isEmpty(LITEHTML_INSTALL_DIR) {
include(qlitehtml/qlitehtml.pri)
HEADERS += litehtmlhelpviewer.h
SOURCES += litehtmlhelpviewer.cpp
DEFINES += QTC_LITEHTML_HELPVIEWER
}
RESOURCES += help.qrc RESOURCES += help.qrc
include(../../shared/help/help.pri) include(../../shared/help/help.pri)

14
src/plugins/help/helpplugin.cpp
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@@ -46,6 +46,9 @@
#include "textbrowserhelpviewer.h" #include "textbrowserhelpviewer.h"
#include "topicchooser.h" #include "topicchooser.h"
#ifdef QTC_LITEHTML_HELPVIEWER
#include "litehtmlhelpviewer.h"
#endif
#ifdef QTC_MAC_NATIVE_HELPVIEWER #ifdef QTC_MAC_NATIVE_HELPVIEWER
#include "macwebkithelpviewer.h" #include "macwebkithelpviewer.h"
#endif #endif
@@ -455,10 +458,15 @@ HelpViewer *HelpPlugin::createHelpViewer(qreal zoom)
using ViewerFactory = std::function<HelpViewer *()>; using ViewerFactory = std::function<HelpViewer *()>;
using ViewerFactoryItem = QPair<QByteArray, ViewerFactory>; // id -> factory using ViewerFactoryItem = QPair<QByteArray, ViewerFactory>; // id -> factory
QVector<ViewerFactoryItem> factories; QVector<ViewerFactoryItem> factories;
#ifdef QTC_WEBENGINE_HELPVIEWER #ifdef QTC_LITEHTML_HELPVIEWER
factories.append(qMakePair(QByteArray("qtwebengine"), []() { return new WebEngineHelpViewer(); })); factories.append(qMakePair(QByteArray("litehtml"), [] { return new LiteHtmlHelpViewer(); }));
#endif #endif
factories.append(qMakePair(QByteArray("textbrowser"), []() { return new TextBrowserHelpViewer(); })); #ifdef QTC_WEBENGINE_HELPVIEWER
factories.append(
qMakePair(QByteArray("qtwebengine"), []() { return new WebEngineHelpViewer(); }));
#endif
factories.append(
qMakePair(QByteArray("textbrowser"), []() { return new TextBrowserHelpViewer(); }));
#ifdef QTC_MAC_NATIVE_HELPVIEWER #ifdef QTC_MAC_NATIVE_HELPVIEWER
// default setting // default setting

356
src/plugins/help/litehtmlhelpviewer.cpp Normal file
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@@ -0,0 +1,356 @@
/****************************************************************************
**
** Copyright (C) 2019 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt Creator.
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
****************************************************************************/
#include "litehtmlhelpviewer.h"
#include "localhelpmanager.h"
#include <utils/algorithm.h>
#include <utils/qtcassert.h>
#include <QClipboard>
#include <QGuiApplication>
#include <QScrollBar>
#include <QTimer>
#include <QVBoxLayout>
#include <QDebug>
using namespace Help;
using namespace Help::Internal;
const int kMaxHistoryItems = 20;
static QByteArray getData(const QUrl &url)
{
// TODO: this is just a hack for Qt documentation
// which decides to use a simpler CSS if the viewer does not have JavaScript
// which was a hack to decide if we are viewing in QTextBrowser or QtWebEngine et al
QUrl actualUrl = url;
QString path = url.path(QUrl::FullyEncoded);
static const char simpleCss[] = "/offline-simple.css";
if (path.endsWith(simpleCss)) {
path.replace(simpleCss, "/offline.css");
actualUrl.setPath(path);
}
const LocalHelpManager::HelpData help = LocalHelpManager::helpData(actualUrl);
// TODO: this is a hack around for https://github.com/litehtml/litehtml/issues/91
QByteArray data = help.data;
if (actualUrl.path(QUrl::FullyEncoded).endsWith(".css"))
data.replace("inline-table", "inline");
return data;
}
LiteHtmlHelpViewer::LiteHtmlHelpViewer(QWidget *parent)
: HelpViewer(parent)
, m_viewer(new QLiteHtmlWidget)
{
m_viewer->setResourceHandler([](const QUrl &url) { return getData(url); });
connect(m_viewer, &QLiteHtmlWidget::linkClicked, this, &LiteHtmlHelpViewer::setSource);
auto layout = new QVBoxLayout;
setLayout(layout);
layout->setContentsMargins(0, 0, 0, 0);
layout->addWidget(m_viewer, 10);
setFocusProxy(m_viewer);
QPalette p = palette();
p.setColor(QPalette::Inactive, QPalette::Highlight,
p.color(QPalette::Active, QPalette::Highlight));
p.setColor(QPalette::Inactive, QPalette::HighlightedText,
p.color(QPalette::Active, QPalette::HighlightedText));
p.setColor(QPalette::Base, Qt::white);
p.setColor(QPalette::Text, Qt::black);
setPalette(p);
}
LiteHtmlHelpViewer::~LiteHtmlHelpViewer() = default;
QFont LiteHtmlHelpViewer::viewerFont() const
{
return m_viewer->defaultFont();
}
void LiteHtmlHelpViewer::setViewerFont(const QFont &newFont)
{
m_viewer->setDefaultFont(newFont);
}
void LiteHtmlHelpViewer::scaleUp()
{
// TODO
}
void LiteHtmlHelpViewer::scaleDown()
{
// TODO
}
void LiteHtmlHelpViewer::resetScale()
{
// TODO
}
qreal LiteHtmlHelpViewer::scale() const
{
// TODO
return 1;
}
void LiteHtmlHelpViewer::setScale(qreal scale)
{
// TODO
}
QString LiteHtmlHelpViewer::title() const
{
return m_viewer->title();
}
QUrl LiteHtmlHelpViewer::source() const
{
return m_viewer->url();
}
void LiteHtmlHelpViewer::setSource(const QUrl &url)
{
if (launchWithExternalApp(url))
return;
m_forwardItems.clear();
emit forwardAvailable(false);
if (m_viewer->url().isValid()) {
m_backItems.push_back(currentHistoryItem());
while (m_backItems.size() > kMaxHistoryItems) // this should trigger only once anyhow
m_backItems.erase(m_backItems.begin());
emit backwardAvailable(true);
}
setSourceInternal(url);
}
void LiteHtmlHelpViewer::setHtml(const QString &html)
{
m_viewer->setUrl({"about:invalid"});
m_viewer->setHtml(html);
}
QString LiteHtmlHelpViewer::selectedText() const
{
return m_viewer->selectedText();
}
bool LiteHtmlHelpViewer::isForwardAvailable() const
{
return !m_forwardItems.empty();
}
bool LiteHtmlHelpViewer::isBackwardAvailable() const
{
return !m_backItems.empty();
}
void LiteHtmlHelpViewer::addBackHistoryItems(QMenu *backMenu)
{
int backCount = 0;
Utils::reverseForeach(m_backItems, [this, backMenu, &backCount](const HistoryItem &item) {
++backCount;
auto action = new QAction(backMenu);
action->setText(item.title);
connect(action, &QAction::triggered, this, [this, backCount] { goBackward(backCount); });
backMenu->addAction(action);
});
}
void LiteHtmlHelpViewer::addForwardHistoryItems(QMenu *forwardMenu)
{
int forwardCount = 0;
for (const HistoryItem &item : m_forwardItems) {
++forwardCount;
auto action = new QAction(forwardMenu);
action->setText(item.title);
connect(action, &QAction::triggered, this, [this, forwardCount] {
goForward(forwardCount);
});
forwardMenu->addAction(action);
}
}
bool LiteHtmlHelpViewer::findText(
const QString &text, Core::FindFlags flags, bool incremental, bool fromSearch, bool *wrapped)
{
// TODO
return false;
}
void LiteHtmlHelpViewer::copy()
{
QGuiApplication::clipboard()->setText(selectedText());
}
void LiteHtmlHelpViewer::stop() {}
void LiteHtmlHelpViewer::forward()
{
goForward(1);
}
void LiteHtmlHelpViewer::backward()
{
goBackward(1);
}
void LiteHtmlHelpViewer::goForward(int count)
{
HistoryItem nextItem = currentHistoryItem();
for (int i = 0; i < count; ++i) {
QTC_ASSERT(!m_forwardItems.empty(), return );
m_backItems.push_back(nextItem);
nextItem = m_forwardItems.front();
m_forwardItems.erase(m_forwardItems.begin());
}
emit backwardAvailable(isBackwardAvailable());
emit forwardAvailable(isForwardAvailable());
setSourceInternal(nextItem.url, nextItem.vscroll);
}
void LiteHtmlHelpViewer::goBackward(int count)
{
HistoryItem previousItem = currentHistoryItem();
for (int i = 0; i < count; ++i) {
QTC_ASSERT(!m_backItems.empty(), return );
m_forwardItems.insert(m_forwardItems.begin(), previousItem);
previousItem = m_backItems.back();
m_backItems.pop_back();
}
emit backwardAvailable(isBackwardAvailable());
emit forwardAvailable(isForwardAvailable());
setSourceInternal(previousItem.url, previousItem.vscroll);
}
void LiteHtmlHelpViewer::print(QPrinter *printer)
{
// TODO
}
void LiteHtmlHelpViewer::setSourceInternal(const QUrl &url, Utils::optional<int> vscroll)
{
slotLoadStarted();
QUrl currentUrlWithoutFragment = m_viewer->url();
currentUrlWithoutFragment.setFragment({});
QUrl newUrlWithoutFragment = url;
newUrlWithoutFragment.setFragment({});
m_viewer->setUrl(url);
if (currentUrlWithoutFragment != newUrlWithoutFragment)
m_viewer->setHtml(QString::fromUtf8(getData(url)));
if (vscroll)
m_viewer->verticalScrollBar()->setValue(*vscroll);
else
m_viewer->scrollToAnchor(url.fragment(QUrl::FullyEncoded));
slotLoadFinished();
emit titleChanged();
}
LiteHtmlHelpViewer::HistoryItem LiteHtmlHelpViewer::currentHistoryItem() const
{
return {m_viewer->url(), m_viewer->title(), m_viewer->verticalScrollBar()->value()};
}
// -- private
//void TextBrowserHelpWidget::contextMenuEvent(QContextMenuEvent *event)
//{
// QMenu menu("", nullptr);
// QAction *copyAnchorAction = nullptr;
// const QUrl link(linkAt(event->pos()));
// if (!link.isEmpty() && link.isValid()) {
// QAction *action = menu.addAction(tr("Open Link"));
// connect(action, &QAction::triggered, this, [this, link]() {
// setSource(link);
// });
// if (m_parent->isActionVisible(HelpViewer::Action::NewPage)) {
// action = menu.addAction(QCoreApplication::translate("HelpViewer", Constants::TR_OPEN_LINK_AS_NEW_PAGE));
// connect(action, &QAction::triggered, this, [this, link]() {
// emit m_parent->newPageRequested(link);
// });
// }
// if (m_parent->isActionVisible(HelpViewer::Action::ExternalWindow)) {
// action = menu.addAction(QCoreApplication::translate("HelpViewer", Constants::TR_OPEN_LINK_IN_WINDOW));
// connect(action, &QAction::triggered, this, [this, link]() {
// emit m_parent->externalPageRequested(link);
// });
// }
// copyAnchorAction = menu.addAction(tr("Copy Link"));
// } else if (!textCursor().selectedText().isEmpty()) {
// connect(menu.addAction(tr("Copy")), &QAction::triggered, this, &QTextEdit::copy);
// } else {
// connect(menu.addAction(tr("Reload")), &QAction::triggered, this, &QTextBrowser::reload);
// }
// if (copyAnchorAction == menu.exec(event->globalPos()))
// QApplication::clipboard()->setText(link.toString());
//}
//bool TextBrowserHelpWidget::eventFilter(QObject *obj, QEvent *event)
//{
// if (obj == this) {
// if (event->type() == QEvent::FontChange) {
// if (!forceFont)
// return true;
// } else if (event->type() == QEvent::KeyPress) {
// auto keyEvent = static_cast<QKeyEvent *>(event);
// if (keyEvent->key() == Qt::Key_Slash) {
// keyEvent->accept();
// Core::Find::openFindToolBar(Core::Find::FindForwardDirection);
// return true;
// }
// } else if (event->type() == QEvent::ToolTip) {
// auto e = static_cast<const QHelpEvent *>(event);
// QToolTip::showText(e->globalPos(), linkAt(e->pos()));
// return true;
// }
// }
// return QTextBrowser::eventFilter(obj, event);
//}
//void TextBrowserHelpWidget::mousePressEvent(QMouseEvent *e)
//{
// if (Utils::HostOsInfo::isLinuxHost() && m_parent->handleForwardBackwardMouseButtons(e))
// return;
// QTextBrowser::mousePressEvent(e);
//}
//void TextBrowserHelpWidget::mouseReleaseEvent(QMouseEvent *e)
//{
// if (!Utils::HostOsInfo::isLinuxHost() && m_parent->handleForwardBackwardMouseButtons(e))
// return;
// bool controlPressed = e->modifiers() & Qt::ControlModifier;
// const QString link = linkAt(e->pos());
// if (m_parent->isActionVisible(HelpViewer::Action::NewPage)
// && (controlPressed || e->button() == Qt::MidButton) && !link.isEmpty()) {
// emit m_parent->newPageRequested(QUrl(link));
// return;
// }
// QTextBrowser::mouseReleaseEvent(e);
//}

99
src/plugins/help/litehtmlhelpviewer.h Normal file
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@@ -0,0 +1,99 @@
/****************************************************************************
**
** Copyright (C) 2019 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt Creator.
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
****************************************************************************/
#pragma once
#include "centralwidget.h"
#include "helpviewer.h"
#include "openpagesmanager.h"
#include <utils/optional.h>
#include <qlitehtmlwidget.h>
#include <QTextBrowser>
namespace Help {
namespace Internal {
class LiteHtmlHelpViewer : public HelpViewer
{
Q_OBJECT
public:
explicit LiteHtmlHelpViewer(QWidget *parent = nullptr);
~LiteHtmlHelpViewer() override;
QFont viewerFont() const override;
void setViewerFont(const QFont &font) override;
qreal scale() const override;
void setScale(qreal scale) override;
QString title() const override;
QUrl source() const override;
void setSource(const QUrl &url) override;
void setHtml(const QString &html) override;
QString selectedText() const override;
bool isForwardAvailable() const override;
bool isBackwardAvailable() const override;
void addBackHistoryItems(QMenu *backMenu) override;
void addForwardHistoryItems(QMenu *forwardMenu) override;
bool findText(const QString &text, Core::FindFlags flags,
bool incremental, bool fromSearch, bool *wrapped = nullptr) override;
void scaleUp() override;
void scaleDown() override;
void resetScale() override;
void copy() override;
void stop() override;
void forward() override;
void backward() override;
void print(QPrinter *printer) override;
private:
void goForward(int count);
void goBackward(int count);
void setSourceInternal(const QUrl &url, Utils::optional<int> vscroll = Utils::nullopt);
struct HistoryItem
{
QUrl url;
QString title;
int vscroll;
};
HistoryItem currentHistoryItem() const;
QLiteHtmlWidget *m_viewer;
std::vector<HistoryItem> m_backItems;
std::vector<HistoryItem> m_forwardItems;
};
} // namespace Internal
} // namespace Help

19
src/plugins/help/qlitehtml/CMakeLists.txt Normal file
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@@ -0,0 +1,19 @@
cmake_minimum_required(VERSION 3.9)
project(QLiteHtml)
set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTORCC ON)
set(CMAKE_AUTOUIC ON)
set(CMAKE_CXX_STANDARD 14)
find_package(litehtml REQUIRED)
find_package(Qt5 COMPONENTS Widgets REQUIRED)
add_library(qlitehtml STATIC
container_qpainter.cpp container_qpainter.h
qlitehtmlwidget.cpp qlitehtmlwidget.h
)
target_include_directories(qlitehtml PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
target_link_libraries(qlitehtml PRIVATE Qt5::Widgets litehtml)

24
src/plugins/help/qlitehtml/README.md Normal file
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@@ -0,0 +1,24 @@
# Qt backend for litehtml
Provides
* A QPainter based rendering backend for the light-weight HTML/CSS rendering engine [litehtml].
* A QWidget that uses the QPainter based backend and provides API for simply setting the HTML text
and a base URL plus hook that are used for requesting referenced resources.
## How to build
Build and install [litehtml]. It is recommended to build [litehtml] in release mode
```
cd litehtml
mkdir build
cd build
cmake -DCMAKE_INSTALL_PREFIX="$PWD/../install" -DCMAKE_BUILD_TYPE=Release -G Ninja ..
cmake --build .
cmake --install .
```
Add the [litehtml] installation path to the `CMAKE_PREFIX_PATH` when building the Qt backend
[litehtml]: https://github.com/litehtml/litehtml

1086
src/plugins/help/qlitehtml/container_qpainter.cpp Normal file
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181
src/plugins/help/qlitehtml/container_qpainter.h Normal file
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@@ -0,0 +1,181 @@
/****************************************************************************
**
** Copyright (C) 2019 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of QLiteHtml.
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
****************************************************************************/
#pragma once
#include <litehtml.h>
#include <QFont>
#include <QHash>
#include <QPixmap>
#include <QRect>
#include <QString>
#include <QUrl>
#include <functional>
class Selection
{
public:
struct Element
{
litehtml::element::ptr element;
int index = -1;
int x = -1;
};
enum class Mode { Free, Word };
bool isValid() const;
void update();
QRect boundingRect() const;
Element startElem;
Element endElem;
QVector<QRect> selection;
QString text;
QPoint selectionStartDocumentPos;
Mode mode = Mode::Free;
bool isSelecting = false;
};
class DocumentContainer : public litehtml::document_container
{
public:
DocumentContainer();
virtual ~DocumentContainer();
litehtml::uint_ptr create_font(const litehtml::tchar_t *faceName,
int size,
int weight,
litehtml::font_style italic,
unsigned int decoration,
litehtml::font_metrics *fm) override;
void delete_font(litehtml::uint_ptr hFont) override;
int text_width(const litehtml::tchar_t *text, litehtml::uint_ptr hFont) override;
void draw_text(litehtml::uint_ptr hdc,
const litehtml::tchar_t *text,
litehtml::uint_ptr hFont,
litehtml::web_color color,
const litehtml::position &pos) override;
int pt_to_px(int pt) override;
int get_default_font_size() const override;
const litehtml::tchar_t *get_default_font_name() const override;
void draw_list_marker(litehtml::uint_ptr hdc, const litehtml::list_marker &marker) override;
void load_image(const litehtml::tchar_t *src,
const litehtml::tchar_t *baseurl,
bool redraw_on_ready) override;
void get_image_size(const litehtml::tchar_t *src,
const litehtml::tchar_t *baseurl,
litehtml::size &sz) override;
void draw_background(litehtml::uint_ptr hdc, const litehtml::background_paint &bg) override;
void draw_borders(litehtml::uint_ptr hdc,
const litehtml::borders &borders,
const litehtml::position &draw_pos,
bool root) override;
void set_caption(const litehtml::tchar_t *caption) override;
void set_base_url(const litehtml::tchar_t *base_url) override;
void link(const std::shared_ptr<litehtml::document> &doc,
const litehtml::element::ptr &el) override;
void on_anchor_click(const litehtml::tchar_t *url, const litehtml::element::ptr &el) override;
void set_cursor(const litehtml::tchar_t *cursor) override;
void transform_text(litehtml::tstring &text, litehtml::text_transform tt) override;
void import_css(litehtml::tstring &text,
const litehtml::tstring &url,
litehtml::tstring &baseurl) override;
void set_clip(const litehtml::position &pos,
const litehtml::border_radiuses &bdr_radius,
bool valid_x,
bool valid_y) override;
void del_clip() override;
void get_client_rect(litehtml::position &client) const override;
std::shared_ptr<litehtml::element> create_element(
const litehtml::tchar_t *tag_name,
const litehtml::string_map &attributes,
const std::shared_ptr<litehtml::document> &doc) override;
void get_media_features(litehtml::media_features &media) const override;
void get_language(litehtml::tstring &language, litehtml::tstring &culture) const override;
void setScrollPosition(const QPoint &pos);
void setDocument(litehtml::document::ptr document);
litehtml::document::ptr document() const;
void render(int width, int height);
// these return areas to redraw in document space
QVector<QRect> mousePressEvent(const QPoint &documentPos,
const QPoint &viewportPos,
Qt::MouseButton button);
QVector<QRect> mouseMoveEvent(const QPoint &documentPos, const QPoint &viewportPos);
QVector<QRect> mouseReleaseEvent(const QPoint &documentPos,
const QPoint &viewportPos,
Qt::MouseButton button);
QVector<QRect> mouseDoubleClickEvent(const QPoint &documentPos,
const QPoint &viewportPos,
Qt::MouseButton button);
QVector<QRect> leaveEvent();
QString caption() const;
QString selectedText() const;
void setDefaultFont(const QFont &font);
QFont defaultFont() const;
using DataCallback = std::function<QByteArray(QUrl)>;
void setDataCallback(const DataCallback &callback);
using CursorCallback = std::function<void(QCursor)>;
void setCursorCallback(const CursorCallback &callback);
using LinkCallback = std::function<void(QUrl)>;
void setLinkCallback(const LinkCallback &callback);
using PaletteCallback = std::function<QPalette()>;
void setPaletteCallback(const PaletteCallback &callback);
private:
QPixmap getPixmap(const QString &imageUrl, const QString &baseUrl);
QString serifFont() const;
QString sansSerifFont() const;
QString monospaceFont() const;
QUrl resolveUrl(const QString &url, const QString &baseUrl) const;
void drawSelection(QPainter *painter, const QRect &clip) const;
litehtml::document::ptr m_document;
QString m_baseUrl;
QRect m_clientRect;
QPoint m_scrollPosition;
QString m_caption;
QFont m_defaultFont = QFont(sansSerifFont(), 16);
QByteArray m_defaultFontFamilyName = m_defaultFont.family().toUtf8();
QHash<QUrl, QPixmap> m_pixmaps;
Selection m_selection;
DataCallback m_dataCallback;
CursorCallback m_cursorCallback;
LinkCallback m_linkCallback;
PaletteCallback m_paletteCallback;
bool m_blockLinks = false;
};

13
src/plugins/help/qlitehtml/qlitehtml.pri Normal file
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HEADERS += \
$$PWD/container_qpainter.h \
$$PWD/qlitehtmlwidget.h
SOURCES += \
$$PWD/container_qpainter.cpp \
$$PWD/qlitehtmlwidget.cpp
INCLUDEPATH += $$PWD $$LITEHTML_INSTALL_DIR/include $$LITEHTML_INSTALL_DIR/include/litehtml
LIBS += -L$$LITEHTML_INSTALL_DIR/lib -llitehtml -lgumbo
win32: PRE_TARGET_DEPS += $$LITEHTML_INSTALL_DIR/lib/litehtml.lib $$LITEHTML_INSTALL_DIR/lib/gumbo.lib
else:unix: PRE_TARGET_DEPS += $$LITEHTML_INSTALL_DIR/lib/liblitehtml.a $$LITEHTML_INSTALL_DIR/lib/libgumbo.a

574
src/plugins/help/qlitehtml/qlitehtmlwidget.cpp Normal file
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/****************************************************************************
**
** Copyright (C) 2019 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of QLiteHtml.
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
****************************************************************************/
#include "qlitehtmlwidget.h"
#include "container_qpainter.h"
#include <QDebug>
#include <QPaintEvent>
#include <QPainter>
#include <QScrollBar>
#include <QStyle>
#include <QTimer>
#include <litehtml.h>
const int kScrollBarStep = 40;
// TODO copied from litehtml/include/master.css
const char mastercss[] = R"RAW(
html {
display: block;
height:100%;
width:100%;
position: relative;
}
head {
display: none
}
meta {
display: none
}
title {
display: none
}
link {
display: none
}
style {
display: none
}
script {
display: none
}
body {
display:block;
margin:8px;
height:100%;
width:100%;
}
p {
display:block;
margin-top:1em;
margin-bottom:1em;
}
b, strong {
display:inline;
font-weight:bold;
}
i, em {
display:inline;
font-style:italic;
}
center
{
text-align:center;
display:block;
}
a:link
{
text-decoration: underline;
color: #00f;
cursor: pointer;
}
h1, h2, h3, h4, h5, h6, div {
display:block;
}
h1 {
font-weight:bold;
margin-top:0.67em;
margin-bottom:0.67em;
font-size: 2em;
}
h2 {
font-weight:bold;
margin-top:0.83em;
margin-bottom:0.83em;
font-size: 1.5em;
}
h3 {
font-weight:bold;
margin-top:1em;
margin-bottom:1em;
font-size:1.17em;
}
h4 {
font-weight:bold;
margin-top:1.33em;
margin-bottom:1.33em
}
h5 {
font-weight:bold;
margin-top:1.67em;
margin-bottom:1.67em;
font-size:.83em;
}
h6 {
font-weight:bold;
margin-top:2.33em;
margin-bottom:2.33em;
font-size:.67em;
}
br {
display:inline-block;
}
br[clear="all"]
{
clear:both;
}
br[clear="left"]
{
clear:left;
}
br[clear="right"]
{
clear:right;
}
span {
display:inline
}
img {
display: inline-block;
}
img[align="right"]
{
float: right;
}
img[align="left"]
{
float: left;
}
hr {
display: block;
margin-top: 0.5em;
margin-bottom: 0.5em;
margin-left: auto;
margin-right: auto;
border-style: inset;
border-width: 1px
}
/***************** TABLES ********************/
table {
display: table;
border-collapse: separate;
border-spacing: 2px;
border-top-color:gray;
border-left-color:gray;
border-bottom-color:black;
border-right-color:black;
}
tbody, tfoot, thead {
display:table-row-group;
vertical-align:middle;
}
tr {
display: table-row;
vertical-align: inherit;
border-color: inherit;
}
td, th {
display: table-cell;
vertical-align: inherit;
border-width:1px;
padding:1px;
}
th {
font-weight: bold;
}
table[border] {
border-style:solid;
}
table[border|=0] {
border-style:none;
}
table[border] td, table[border] th {
border-style:solid;
border-top-color:black;
border-left-color:black;
border-bottom-color:gray;
border-right-color:gray;
}
table[border|=0] td, table[border|=0] th {
border-style:none;
}
caption {
display: table-caption;
}
td[nowrap], th[nowrap] {
white-space:nowrap;
}
tt, code, kbd, samp {
font-family: monospace
}
pre, xmp, plaintext, listing {
display: block;
font-family: monospace;
white-space: pre;
margin: 1em 0
}
/***************** LISTS ********************/
ul, menu, dir {
display: block;
list-style-type: disc;
margin-top: 1em;
margin-bottom: 1em;
margin-left: 0;
margin-right: 0;
padding-left: 40px
}
ol {
display: block;
list-style-type: decimal;
margin-top: 1em;
margin-bottom: 1em;
margin-left: 0;
margin-right: 0;
padding-left: 40px
}
li {
display: list-item;
}
ul ul, ol ul {
list-style-type: circle;
}
ol ol ul, ol ul ul, ul ol ul, ul ul ul {
list-style-type: square;
}
dd {
display: block;
margin-left: 40px;
}
dl {
display: block;
margin-top: 1em;
margin-bottom: 1em;
margin-left: 0;
margin-right: 0;
}
dt {
display: block;
}
ol ul, ul ol, ul ul, ol ol {
margin-top: 0;
margin-bottom: 0
}
blockquote {
display: block;
margin-top: 1em;
margin-bottom: 1em;
margin-left: 40px;
margin-left: 40px;
}
/*********** FORM ELEMENTS ************/
form {
display: block;
margin-top: 0em;
}
option {
display: none;
}
input, textarea, keygen, select, button, isindex {
margin: 0em;
color: initial;
line-height: normal;
text-transform: none;
text-indent: 0;
text-shadow: none;
display: inline-block;
}
input[type="hidden"] {
display: none;
}
article, aside, footer, header, hgroup, nav, section
{
display: block;
}
)RAW";
class QLiteHtmlWidgetPrivate
{
public:
litehtml::context context;
QUrl url;
DocumentContainer documentContainer;
};
QLiteHtmlWidget::QLiteHtmlWidget(QWidget *parent)
: QAbstractScrollArea(parent)
, d(new QLiteHtmlWidgetPrivate)
{
setMouseTracking(true);
horizontalScrollBar()->setSingleStep(kScrollBarStep);
verticalScrollBar()->setSingleStep(kScrollBarStep);
d->documentContainer.setCursorCallback([this](const QCursor &c) { viewport()->setCursor(c); });
d->documentContainer.setPaletteCallback([this] { return palette(); });
d->documentContainer.setLinkCallback([this](const QUrl &url) {
QUrl fullUrl = url;
if (url.isRelative() && url.path(QUrl::FullyEncoded).isEmpty()) { // fragment/anchor only
fullUrl = d->url;
fullUrl.setFragment(url.fragment(QUrl::FullyEncoded));
}
// delay because document may not be changed directly during this callback
QTimer::singleShot(0, this, [this, fullUrl] { emit linkClicked(fullUrl); });
});
// TODO adapt mastercss to palette (default text & background color)
d->context.load_master_stylesheet(mastercss);
}
QLiteHtmlWidget::~QLiteHtmlWidget()
{
delete d;
}
void QLiteHtmlWidget::setUrl(const QUrl &url)
{
d->url = url;
QUrl urlWithoutAnchor = url;
urlWithoutAnchor.setFragment({});
const QString urlString = urlWithoutAnchor.toString(QUrl::None);
const int lastSlash = urlString.lastIndexOf('/');
const QString baseUrl = lastSlash >= 0 ? urlString.left(lastSlash) : urlString;
d->documentContainer.set_base_url(baseUrl.toUtf8().constData());
}
QUrl QLiteHtmlWidget::url() const
{
return d->url;
}
void QLiteHtmlWidget::setHtml(const QString &content)
{
litehtml::document::ptr doc = litehtml::document::createFromUTF8(content.toUtf8().constData(),
&d->documentContainer,
&d->context);
d->documentContainer.setDocument(doc);
verticalScrollBar()->setValue(0);
horizontalScrollBar()->setValue(0);
render();
}
QString QLiteHtmlWidget::title() const
{
return d->documentContainer.caption();
}
void QLiteHtmlWidget::setDefaultFont(const QFont &font)
{
d->documentContainer.setDefaultFont(font);
render();
}
QFont QLiteHtmlWidget::defaultFont() const
{
return d->documentContainer.defaultFont();
}
void QLiteHtmlWidget::scrollToAnchor(const QString &name)
{
if (!d->documentContainer.document())
return;
horizontalScrollBar()->setValue(0);
if (name.isEmpty()) {
verticalScrollBar()->setValue(0);
return;
}
litehtml::element::ptr element = d->documentContainer.document()->root()->select_one(
QString("#%1").arg(name).toStdString());
if (!element) {
element = d->documentContainer.document()->root()->select_one(
QString("[name=%1]").arg(name).toStdString());
}
if (element) {
const int y = element->get_placement().y;
verticalScrollBar()->setValue(std::min(y, verticalScrollBar()->maximum()));
}
}
void QLiteHtmlWidget::setResourceHandler(const QLiteHtmlWidget::ResourceHandler &handler)
{
d->documentContainer.setDataCallback(handler);
}
QString QLiteHtmlWidget::selectedText() const
{
return d->documentContainer.selectedText();
}
void QLiteHtmlWidget::paintEvent(QPaintEvent *event)
{
if (!d->documentContainer.document())
return;
d->documentContainer.setScrollPosition(scrollPosition());
const QPoint pos = -scrollPosition();
const QRect r = event->rect();
const litehtml::position clip = {r.x(), r.y(), r.width(), r.height()};
QPainter p(viewport());
d->documentContainer.document()->draw(reinterpret_cast<litehtml::uint_ptr>(&p),
pos.x(),
pos.y(),
&clip);
}
void QLiteHtmlWidget::resizeEvent(QResizeEvent *event)
{
QAbstractScrollArea::resizeEvent(event);
render();
}
void QLiteHtmlWidget::mouseMoveEvent(QMouseEvent *event)
{
QPoint viewportPos;
QPoint pos;
htmlPos(event->pos(), &viewportPos, &pos);
for (const QRect &r : d->documentContainer.mouseMoveEvent(pos, viewportPos))
viewport()->update(r.translated(-scrollPosition()));
}
void QLiteHtmlWidget::mousePressEvent(QMouseEvent *event)
{
QPoint viewportPos;
QPoint pos;
htmlPos(event->pos(), &viewportPos, &pos);
for (const QRect &r : d->documentContainer.mousePressEvent(pos, viewportPos, event->button()))
viewport()->update(r.translated(-scrollPosition()));
}
void QLiteHtmlWidget::mouseReleaseEvent(QMouseEvent *event)
{
QPoint viewportPos;
QPoint pos;
htmlPos(event->pos(), &viewportPos, &pos);
for (const QRect &r : d->documentContainer.mouseReleaseEvent(pos, viewportPos, event->button()))
viewport()->update(r.translated(-scrollPosition()));
}
void QLiteHtmlWidget::mouseDoubleClickEvent(QMouseEvent *event)
{
QPoint viewportPos;
QPoint pos;
htmlPos(event->pos(), &viewportPos, &pos);
for (const QRect &r :
d->documentContainer.mouseDoubleClickEvent(pos, viewportPos, event->button())) {
viewport()->update(r.translated(-scrollPosition()));
}
}
void QLiteHtmlWidget::leaveEvent(QEvent *event)
{
Q_UNUSED(event)
for (const QRect &r : d->documentContainer.leaveEvent())
viewport()->update(r.translated(-scrollPosition()));
}
void QLiteHtmlWidget::render()
{
if (!d->documentContainer.document())
return;
const int scrollbarWidth = style()->pixelMetric(QStyle::PM_ScrollBarExtent, nullptr, this);
const int w = width() - scrollbarWidth - 2;
d->documentContainer.render(w, viewport()->height());
horizontalScrollBar()->setPageStep(viewport()->width());
horizontalScrollBar()
->setRange(0, std::max(0, d->documentContainer.document()->width() - viewport()->width()));
verticalScrollBar()->setPageStep(viewport()->height());
verticalScrollBar()->setRange(0,
std::max(0,
d->documentContainer.document()->height()
- viewport()->height()));
viewport()->update();
}
QPoint QLiteHtmlWidget::scrollPosition() const
{
return {horizontalScrollBar()->value(), verticalScrollBar()->value()};
}
void QLiteHtmlWidget::htmlPos(const QPoint &pos, QPoint *viewportPos, QPoint *htmlPos) const
{
*viewportPos = viewport()->mapFromParent(pos);
*htmlPos = *viewportPos + scrollPosition();
}

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src/plugins/help/qlitehtml/qlitehtmlwidget.h Normal file
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/****************************************************************************
**
** Copyright (C) 2019 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of QLiteHtml.
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
****************************************************************************/
#pragma once
#include <QAbstractScrollArea>
#include <functional>
class QLiteHtmlWidgetPrivate;
class QLiteHtmlWidget : public QAbstractScrollArea
{
Q_OBJECT
public:
explicit QLiteHtmlWidget(QWidget *parent = nullptr);
~QLiteHtmlWidget() override;
void setUrl(const QUrl &url);
QUrl url() const;
void setHtml(const QString &content);
QString title() const;
void setDefaultFont(const QFont &font);
QFont defaultFont() const;
void scrollToAnchor(const QString &name);
using ResourceHandler = std::function<QByteArray(QUrl)>;
void setResourceHandler(const ResourceHandler &handler);
QString selectedText() const;
signals:
void linkClicked(const QUrl &url);
protected:
void paintEvent(QPaintEvent *event) override;
void resizeEvent(QResizeEvent *event) override;
void mouseMoveEvent(QMouseEvent *event) override;
void mousePressEvent(QMouseEvent *event) override;
void mouseReleaseEvent(QMouseEvent *event) override;
void mouseDoubleClickEvent(QMouseEvent *event) override;
void leaveEvent(QEvent *event) override;
private:
void render();
QPoint scrollPosition() const;
void htmlPos(const QPoint &pos, QPoint *viewportPos, QPoint *htmlPos) const;
QLiteHtmlWidgetPrivate *d;
};