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subsurface/desktop-widgets/printdialog.cpp
Robert C. Helling e7977ee280 desktop: re-add WebEngine support 
This reverts commit 643f4a5726 and finishes the task of adding WebEngine as an
alternate backend to be used in printing.

The ultimate goal is to be able to build without QtWebKit (as that is no longer
supported in Qt6). WebKit was used in two places: The user manual and printing.
This patch makes printing work with WebEngine.

The main obstacle is that WebEngine no longer allows accessing HTML elements
from C++ code and rendering the page to a QPainter.

The old version used this to figure out dimensions and page breaks for the
pages and then in the QPainter placed the profile images. With WebEninge, you
need to access the elements using JavaScript which is now used to place the
profile in the html proplerly as an <img> tag. To this end, both html and
profile images are written to a temporary directory on disk.

This image replacement by JavaScript is only necessary to make old templates
still work. It could be replaced by actually putting <img> tags in the
templates (but this would break user edited templates).

In my experiments, the page breaking was done great by html/css, so the
additional magic seems superflous.

What remains to be done:
* remove empty page at the end of printout
* make preview great again (in particlar needed for template editing)

Note: since QtWebEngine currently cannot be built with our toolchain on
Windows, this patch keeps QtWebKit support around by making the QtWebEngine
compile-time conditional via #ifdefs.

[Dirk Hohndel: merged a few commits to make this more logical - the resulting
commit is fairly big, but IMHO preferrable]

Signed-off-by: Robert C. Helling <helling@atdotde.de>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
2021-11-26 12:32:10 -08:00

254 lines
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// SPDX-License-Identifier: GPL-2.0
#include "printdialog.h"
#ifdef USE_WEBENGINE
#include "printerwebengine.h"
#else
#include "printer.h"
#endif
#include "core/pref.h"
#include "core/dive.h" // for existing_filename
#ifndef NO_PRINTING
#include <QProgressBar>
#include <QPrinter>
#include <QPrintPreviewDialog>
#include <QPrintDialog>
#include <QFileDialog>
#include <QShortcut>
#include <QSettings>
#include <QMessageBox>
#include <QDialogButtonBox>
#ifdef USE_WEBENGINE
#include <QWebEngineView>
#endif
#define SETTINGS_GROUP "PrintDialog"
template_options::color_palette_struct ssrf_colors, almond_colors, blueshades_colors, custom_colors;
PrintDialog::PrintDialog(bool inPlanner, QWidget *parent) :
QDialog(parent, QFlag(0)),
inPlanner(inPlanner),
printer(NULL),
qprinter(NULL)
{
// initialize const colors
ssrf_colors.color1 = QColor::fromRgb(0xff, 0xff, 0xff);
ssrf_colors.color2 = QColor::fromRgb(0xa6, 0xbc, 0xd7);
ssrf_colors.color3 = QColor::fromRgb(0xef, 0xf7, 0xff);
ssrf_colors.color4 = QColor::fromRgb(0x34, 0x65, 0xa4);
ssrf_colors.color5 = QColor::fromRgb(0x20, 0x4a, 0x87);
ssrf_colors.color6 = QColor::fromRgb(0x17, 0x37, 0x64);
almond_colors.color1 = QColor::fromRgb(255, 255, 255);
almond_colors.color2 = QColor::fromRgb(253, 204, 156);
almond_colors.color3 = QColor::fromRgb(243, 234, 207);
almond_colors.color4 = QColor::fromRgb(136, 160, 150);
almond_colors.color5 = QColor::fromRgb(187, 171, 139);
almond_colors.color6 = QColor::fromRgb(0, 0, 0);
blueshades_colors.color1 = QColor::fromRgb(255, 255, 255);
blueshades_colors.color2 = QColor::fromRgb(142, 152, 166);
blueshades_colors.color3 = QColor::fromRgb(182, 192, 206);
blueshades_colors.color4 = QColor::fromRgb(31, 49, 75);
blueshades_colors.color5 = QColor::fromRgb(21, 45, 84);
blueshades_colors.color6 = QColor::fromRgb(0, 0, 0);
// check if the options were previously stored in the settings; if not use some defaults.
QSettings s;
s.beginGroup(SETTINGS_GROUP);
printOptions.type = (print_options::print_type)s.value("type", print_options::DIVELIST).toInt();
printOptions.print_selected = s.value("print_selected", true).toBool();
printOptions.color_selected = s.value("color_selected", true).toBool();
printOptions.landscape = s.value("landscape", false).toBool();
printOptions.p_template = s.value("template_selected", "one_dive.html").toString();
printOptions.resolution = s.value("resolution", 600).toInt();
templateOptions.font_index = s.value("font", 0).toInt();
templateOptions.font_size = s.value("font_size", 9).toDouble();
templateOptions.color_palette_index = s.value("color_palette", SSRF_COLORS).toInt();
templateOptions.line_spacing = s.value("line_spacing", 1).toDouble();
templateOptions.border_width = s.value("border_width", 1).toInt();
custom_colors.color1 = QColor(s.value("custom_color_1", ssrf_colors.color1).toString());
custom_colors.color2 = QColor(s.value("custom_color_2", ssrf_colors.color2).toString());
custom_colors.color3 = QColor(s.value("custom_color_3", ssrf_colors.color3).toString());
custom_colors.color4 = QColor(s.value("custom_color_4", ssrf_colors.color4).toString());
custom_colors.color5 = QColor(s.value("custom_color_5", ssrf_colors.color5).toString());
s.endGroup();
// handle cases from old QSettings group
if (templateOptions.font_size < 9) {
templateOptions.font_size = 9;
}
if (templateOptions.line_spacing < 1) {
templateOptions.line_spacing = 1;
}
switch (templateOptions.color_palette_index) {
case SSRF_COLORS: // default Subsurface derived colors
templateOptions.color_palette = ssrf_colors;
break;
case ALMOND: // almond
templateOptions.color_palette = almond_colors;
break;
case BLUESHADES: // blueshades
templateOptions.color_palette = blueshades_colors;
break;
case CUSTOM: // custom
templateOptions.color_palette = custom_colors;
break;
}
// create a print options object and pass our options struct
optionsWidget = new PrintOptions(this, printOptions, templateOptions);
QVBoxLayout *layout = new QVBoxLayout(this);
setLayout(layout);
layout->addWidget(optionsWidget);
progressBar = new QProgressBar();
progressBar->setMinimum(0);
progressBar->setMaximum(100);
progressBar->setValue(0);
progressBar->setTextVisible(false);
layout->addWidget(progressBar);
QHBoxLayout *hLayout = new QHBoxLayout();
layout->addLayout(hLayout);
QPushButton *printButton = new QPushButton(tr("P&rint"));
connect(printButton, SIGNAL(clicked(bool)), this, SLOT(printClicked()));
QPushButton *previewButton = new QPushButton(tr("&Preview"));
connect(previewButton, SIGNAL(clicked(bool)), this, SLOT(previewClicked()));
QPushButton *exportHtmlButton = new QPushButton(tr("Export Html"));
connect(exportHtmlButton, SIGNAL(clicked(bool)), this, SLOT(exportHtmlClicked()));
QDialogButtonBox *buttonBox = new QDialogButtonBox;
buttonBox->addButton(QDialogButtonBox::Cancel);
buttonBox->addButton(printButton, QDialogButtonBox::AcceptRole);
buttonBox->addButton(previewButton, QDialogButtonBox::ActionRole);
buttonBox->addButton(exportHtmlButton, QDialogButtonBox::AcceptRole);
connect(buttonBox, SIGNAL(rejected()), this, SLOT(reject()));
hLayout->addWidget(buttonBox);
setWindowTitle(tr("Print"));
setWindowIcon(QIcon(":subsurface-icon"));
QShortcut *close = new QShortcut(QKeySequence(Qt::CTRL + Qt::Key_W), this);
connect(close, SIGNAL(activated()), this, SLOT(close()));
QShortcut *quit = new QShortcut(QKeySequence(Qt::CTRL + Qt::Key_Q), this);
connect(quit, SIGNAL(activated()), parent, SLOT(close()));
// seems to be the most reliable way to track for all sorts of dialog disposal.
connect(this, SIGNAL(finished(int)), this, SLOT(onFinished()));
}
PrintDialog::~PrintDialog()
{
delete qprinter;
delete printer;
}
void PrintDialog::onFinished()
{
QSettings s;
s.beginGroup(SETTINGS_GROUP);
// save print paper settings
s.setValue("type", printOptions.type);
s.setValue("print_selected", printOptions.print_selected);
s.setValue("color_selected", printOptions.color_selected);
s.setValue("template_selected", printOptions.p_template);
s.setValue("resolution", printOptions.resolution);
// save template settings
s.setValue("font", templateOptions.font_index);
s.setValue("font_size", templateOptions.font_size);
s.setValue("color_palette", templateOptions.color_palette_index);
s.setValue("line_spacing", templateOptions.line_spacing);
s.setValue("border_width", templateOptions.border_width);
// save custom colors
s.setValue("custom_color_1", custom_colors.color1.name());
s.setValue("custom_color_2", custom_colors.color2.name());
s.setValue("custom_color_3", custom_colors.color3.name());
s.setValue("custom_color_4", custom_colors.color4.name());
s.setValue("custom_color_5", custom_colors.color5.name());
}
void PrintDialog::createPrinterObj()
{
// create a new printer object
if (!printer) {
qprinter = new QPrinter;
qprinter->setResolution(printOptions.resolution);
qprinter->setOrientation((QPrinter::Orientation)printOptions.landscape);
printer = new Printer(qprinter, printOptions, templateOptions, Printer::PRINT, inPlanner);
}
}
void PrintDialog::previewClicked(void)
{
createPrinterObj();
QPrintPreviewDialog previewDialog(qprinter, this, Qt::Window
| Qt::CustomizeWindowHint | Qt::WindowCloseButtonHint
| Qt::WindowTitleHint);
connect(&previewDialog, SIGNAL(paintRequested(QPrinter *)), this, SLOT(onPaintRequested(QPrinter *)));
previewDialog.exec();
}
void PrintDialog::exportHtmlClicked(void)
{
createPrinterObj();
QString saveFileName = printOptions.p_template;
QString filename = existing_filename ?: prefs.default_filename;
QFileInfo fi(filename);
filename = fi.absolutePath().append(QDir::separator()).append(saveFileName);
QString htmlExportFilename = QFileDialog::getSaveFileName(this, tr("Filename to export html to"),
filename, tr("Html file") + " (*.html)");
if (!htmlExportFilename.isEmpty()) {
QFile file(htmlExportFilename);
file.open(QIODevice::WriteOnly);
connect(printer, SIGNAL(progessUpdated(int)), progressBar, SLOT(setValue(int)));
file.write(printer->exportHtml().toUtf8());
file.close();
close();
}
}
void PrintDialog::printClicked(void)
{
createPrinterObj();
QPrintDialog printDialog(qprinter, this);
#ifdef USE_WEBENGINE
connect(printer, SIGNAL(progessUpdated(int)), progressBar, SLOT(setValue(int)));
connect(printer, &Printer::jobDone, this, &PrintDialog::printingDone);
printer->print();
#else
if (printDialog.exec() == QDialog::Accepted) {
connect(printer, SIGNAL(progessUpdated(int)), progressBar, SLOT(setValue(int)));
printer->print();
close();
}
#endif
}
#ifdef USE_WEBENGINE
void PrintDialog::printingDone()
{
close();
}
#endif
void PrintDialog::onPaintRequested(QPrinter*)
{
createPrinterObj();
connect(printer, SIGNAL(progessUpdated(int)), progressBar, SLOT(setValue(int)));
printer->print();
progressBar->setValue(0);
disconnect(printer, SIGNAL(progessUpdated(int)), progressBar, SLOT(setValue(int)));
}
#endif
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