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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#include "selectabletexteditorwidget.h"
#include <texteditor/displaysettings.h>
#include <texteditor/textdocument.h>
#include <texteditor/textdocumentlayout.h>
#include <texteditor/texteditorsettings.h>
#include <QPainter>
#include <QTextBlock>
using namespace TextEditor;
namespace DiffEditor::Internal {
SelectableTextEditorWidget::SelectableTextEditorWidget(Utils::Id id, QWidget *parent)
: TextEditorWidget(parent)
{
setFrameStyle(QFrame::NoFrame);
setupFallBackEditor(id);
setReadOnly(true);
connect(TextEditorSettings::instance(), &TextEditorSettings::displaySettingsChanged,
this, &SelectableTextEditorWidget::setDisplaySettings);
SelectableTextEditorWidget::setDisplaySettings(TextEditorSettings::displaySettings());
setCodeStyle(TextEditorSettings::codeStyle());
setCodeFoldingSupported(true);
}
SelectableTextEditorWidget::~SelectableTextEditorWidget() = default;
void SelectableTextEditorWidget::setSelections(const DiffSelections &selections)
{
m_diffSelections = selections;
}
void SelectableTextEditorWidget::setDisplaySettings(const DisplaySettings &displaySettings)
{
DisplaySettings settings = displaySettings;
settings.m_textWrapping = false;
settings.m_displayLineNumbers = true;
settings.m_markTextChanges = false;
settings.m_highlightBlocks = false;
TextEditorWidget::setDisplaySettings(settings);
}
static QList<DiffSelection> subtractSelection(
const DiffSelection &minuendSelection,
const DiffSelection &subtrahendSelection)
{
// tha case that whole minuend is before the whole subtrahend
if (minuendSelection.end >= 0 && minuendSelection.end <= subtrahendSelection.start)
return {minuendSelection};
// the case that whole subtrahend is before the whole minuend
if (subtrahendSelection.end >= 0 && subtrahendSelection.end <= minuendSelection.start)
return {minuendSelection};
bool makeMinuendSubtrahendStart = false;
bool makeSubtrahendMinuendEnd = false;
if (minuendSelection.start < subtrahendSelection.start)
makeMinuendSubtrahendStart = true;
if (subtrahendSelection.end >= 0 && (subtrahendSelection.end < minuendSelection.end || minuendSelection.end < 0))
makeSubtrahendMinuendEnd = true;
QList<DiffSelection> diffList;
if (makeMinuendSubtrahendStart)
diffList += {minuendSelection.format, minuendSelection.start, subtrahendSelection.start};
if (makeSubtrahendMinuendEnd)
diffList += {minuendSelection.format, subtrahendSelection.end, minuendSelection.end};
return diffList;
}
DiffSelections SelectableTextEditorWidget::polishedSelections(const DiffSelections &selections)
{
DiffSelections polishedSelections;
for (auto it = selections.cbegin(), end = selections.cend(); it != end; ++it) {
const QList<DiffSelection> diffSelections = it.value();
QList<DiffSelection> workingList;
for (const DiffSelection &diffSelection : diffSelections) {
if (diffSelection.start == -1 && diffSelection.end == 0)
continue;
if (diffSelection.start == diffSelection.end && diffSelection.start >= 0)
continue;
int j = 0;
while (j < workingList.count()) {
const DiffSelection existingSelection = workingList.takeAt(j);
const QList<DiffSelection> newSelection = subtractSelection(existingSelection, diffSelection);
for (int k = 0; k < newSelection.count(); k++)
workingList.insert(j + k, newSelection.at(k));
j += newSelection.count();
}
workingList.append(diffSelection);
}
polishedSelections.insert(it.key(), workingList);
}
return polishedSelections;
}
void SelectableTextEditorWidget::setFoldingIndent(const QTextBlock &block, int indent)
{
if (TextBlockUserData *userData = TextDocumentLayout::userData(block))
userData->setFoldingIndent(indent);
}
void SelectableTextEditorWidget::paintBlock(QPainter *painter,
const QTextBlock &block,
const QPointF &offset,
const QVector<QTextLayout::FormatRange> &selections,
const QRect &clipRect) const
{
const int blockNumber = block.blockNumber();
QList<DiffSelection> diffs = m_diffSelections.value(blockNumber);
QVector<QTextLayout::FormatRange> newSelections;
for (const DiffSelection &diffSelection : diffs) {
if (diffSelection.format) {
QTextLayout::FormatRange formatRange;
formatRange.start = qMax(0, diffSelection.start);
const int end = diffSelection.end < 0
? block.text().count() + 1
: qMin(block.text().count(), diffSelection.end);
formatRange.length = end - formatRange.start;
formatRange.format = *diffSelection.format;
if (diffSelection.end < 0)
formatRange.format.setProperty(QTextFormat::FullWidthSelection, true);
newSelections.append(formatRange);
}
}
newSelections += selections;
TextEditorWidget::paintBlock(painter, block, offset, newSelections, clipRect);
}
} // namespace DiffEditor::Internal
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