VuoCodeGutter.cc

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#include "VuoCodeGutter.hh"
 
#include <sys/param.h>
 
#include "VuoCodeEditor.hh"
#include "VuoCodeEditorStages.hh"
#include "VuoCodeWindow.hh"
#include "VuoShaderIssues.hh"
 
qreal VuoCodeGutter::leftMargin = 5;
qreal VuoCodeGutter::rightMargin = 5;
 
VuoCodeGutter::VuoCodeGutter(VuoCodeEditor *editor)
    : QWidget(editor)
{
    codeEditor = editor;
    scrollPosition = 0;
 
    lineNumberFont = QFont("Menlo");
 
    connect(codeEditor,                      &QTextEdit::textChanged,        this, &VuoCodeGutter::textChanged);
    connect(codeEditor->verticalScrollBar(), &QAbstractSlider::valueChanged, this, &VuoCodeGutter::handleSliderMoved);
}
 
void VuoCodeGutter::updateLineNumberFont()
{
    lineNumberFont.setPointSize(codeEditor->font().pointSize() * .8);
    resizeEvent(NULL);
    update();
}
 
void VuoCodeGutter::paintEvent(QPaintEvent *event)
{
    QRect r = event->rect();
 
    QPainter painter(this);
    painter.fillRect(r, codeEditor->gutterColor);
 
    painter.setPen(codeEditor->gutterTextColor);
    painter.setFont(lineNumberFont);
    QFontMetrics lineNumberFontMetrics(lineNumberFont);
    int lineHeight = codeEditor->fontMetrics().height();
    int baselineAdjustment = codeEditor->fontMetrics().ascent() - lineNumberFontMetrics.ascent();
    int gutterWidth = width() - rightMargin;
 
    // QFontMetrics.lineHeight is in pixels, but QTextEdit doesn't quantize lines to pixels,
    // so we can't just draw at multiples of lineHeight.
    // Instead, get the actual position of each line from the QTextLayout.
    QTextCursor cursor = codeEditor->textCursor();
    cursor.movePosition(QTextCursor::Start);
    QTextBlock block = cursor.block();
    int viewportHeight = codeEditor->viewport()->geometry().height();
    int lineNumber = 0;
 
    VuoCodeWindow *codeWindow = static_cast<VuoCodeWindow *>(window());
    if (codeWindow->issues)
    {
        vector<VuoShaderIssues::Issue> issues = codeWindow->issues->issuesForStage(codeWindow->stages->currentStage());
        // The issue list is assumed to be sorted by line number.
        // Therefore we only need to advance through it once, instead of once for every line number.
        vector<VuoShaderIssues::Issue>::iterator issueIterator = issues.begin();
 
        int iconSize = codeEditor->errorIcon->height() / window()->devicePixelRatio();
 
        do
        {
            ++lineNumber;
            qreal y = block.layout()->position().y() - scrollPosition;
            if (y < -lineHeight)
                continue;
            if (y > viewportHeight)
                break;
 
            painter.drawText(QRectF(0, y + baselineAdjustment + 1, gutterWidth, lineHeight),
                             Qt::AlignRight, QString::number(lineNumber));
 
            bool haveIssue = false;
            while (issueIterator != issues.end())
            {
                if (issueIterator->lineNumber == lineNumber)
                {
                    haveIssue = true;
                    break;
                }
                if (issueIterator->lineNumber > lineNumber)
                    break;
                ++issueIterator;
            }
            if (haveIssue)
                painter.drawPixmap(leftMargin, y + (lineHeight - iconSize) / 2, iconSize, iconSize, *codeEditor->errorIcon);
        } while ((block = block.next()).isValid());
    }
}
 
void VuoCodeGutter::handleSliderMoved(int value)
{
    scrollPosition = value;
    update();
}
 
void VuoCodeGutter::textChanged()
{
    resizeEvent(NULL);
    update();
}
 
void VuoCodeGutter::resizeEvent(QResizeEvent *event)
{
    int lineNumberDigits = MAX(2, log10(codeEditor->document()->lineCount()) + 1);
    QFontMetricsF lineNumberFontMetrics(lineNumberFont);
    int iconSize = codeEditor->errorIcon->height() / window()->devicePixelRatio();
    int width = leftMargin + iconSize + leftMargin + lineNumberFontMetrics.horizontalAdvance('0') * lineNumberDigits + rightMargin;
 
    if (width == size().width())
        return;
 
    QRect c = codeEditor->rect();
    setGeometry(QRect(c.left(), c.top(), width, c.height()));
 
    codeEditor->setViewportMargins(width, 0, 0, 0);
 
    if (codeEditor->parent())
    {
        VuoCodeEditorStages *stages = static_cast<VuoCodeEditorStages *>(codeEditor->parent()->parent());
        stages->updatePosition();
    }
}