EasyNote/codeeditor.cpp at main · magicdmer/EasyNote · GitHub

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#include <QtWidgets>
#include <QFontMetrics>
#include "codeeditor.h"

extern bool g_darkMode;

CodeEditor::CodeEditor(QWidget *parent) : QPlainTextEdit(parent)
{
    lineNumberArea = new LineNumberArea(this);

    connect(this, SIGNAL(blockCountChanged(int)), this, SLOT(updateLineNumberAreaWidth(int)));
    connect(this, SIGNAL(updateRequest(QRect,int)), this, SLOT(updateLineNumberArea(QRect,int)));

    updateLineNumberAreaWidth(0);
    flattenInactivePalette();
    qApp->installEventFilter(this);
}

void CodeEditor::flattenInactivePalette()
{
    QPalette p = QApplication::palette();
    const QPalette::ColorRole roles[] = {
        QPalette::Text, QPalette::Base, QPalette::WindowText,
        QPalette::Window, QPalette::Highlight, QPalette::HighlightedText
    };
    for (QPalette::ColorRole role : roles)
    {
        p.setColor(QPalette::Inactive, role, p.color(QPalette::Active, role));
    }
    setPalette(p);
    viewport()->setPalette(p);
    viewport()->update();
}

bool CodeEditor::eventFilter(QObject *watched, QEvent *event)
{
    if (watched == qApp && event->type() == QEvent::ApplicationPaletteChange)
    {
        flattenInactivePalette();
    }
    return QPlainTextEdit::eventFilter(watched, event);
}

int CodeEditor::lineNumberAreaWidth()
{
    int digits = 1;
    int max = qMax(1, blockCount());
    while (max >= 10) {
        max /= 10;
        ++digits;
    }

    int space = 20 + fontMetrics().width(QLatin1Char('9')) * digits;

    return space;
}

void CodeEditor::updateLineNumberAreaWidth(int /* newBlockCount */)
{
    setViewportMargins(lineNumberAreaWidth(), 0, 0, 0);
}

void CodeEditor::updateLineNumberArea(const QRect &rect, int dy)
{
    if (dy)
        lineNumberArea->scroll(0, dy);
    else
        lineNumberArea->update(0, rect.y(), lineNumberArea->width(), rect.height());

    if (rect.contains(viewport()->rect()))
        updateLineNumberAreaWidth(0);
}

void CodeEditor::resizeEvent(QResizeEvent *e)
{
    QPlainTextEdit::resizeEvent(e);

    QRect cr = contentsRect();
    lineNumberArea->setGeometry(QRect(cr.left(), cr.top(), lineNumberAreaWidth(), cr.height()));
}

void CodeEditor::dealBackTab()
{
    QTextCursor cur = textCursor();
    int pos = cur.position();
    int anchor = cur.anchor();

    cur.setPosition(pos);

    cur.setPosition(pos-1,QTextCursor::KeepAnchor);

    if (cur.selectedText() == "\t")
    {
        cur.removeSelectedText();
        cur.setPosition(anchor-1);
        cur.setPosition(pos-1,QTextCursor::KeepAnchor);
    }
    else
    {
        cur.setPosition(anchor);
        cur.setPosition(anchor-1,QTextCursor::KeepAnchor);
        if (cur.selectedText() == "\t")
        {
            cur.removeSelectedText();
            cur.setPosition(anchor-1);
            cur.setPosition(pos-1,QTextCursor::KeepAnchor);
        }
        else
        {
            cur.setPosition(anchor);
            cur.setPosition(pos,QTextCursor::KeepAnchor);
        }
    }
}

void CodeEditor::lineNumberAreaPaintEvent(QPaintEvent *event)
{
    QPainter painter(lineNumberArea);

    if (!g_darkMode)
    {
        QColor color(240,240,240);
        painter.fillRect(event->rect(), color);
    }

    QTextBlock block = firstVisibleBlock();
    int blockNumber = block.blockNumber();
    int top = (int) blockBoundingGeometry(block).translated(contentOffset()).top();
    int bottom = top + (int) blockBoundingRect(block).height();

    int curLine = textCursor().blockNumber();

    while (block.isValid() && top <= event->rect().bottom()) {
        if (block.isVisible() && bottom >= event->rect().top()) {
            QString number = QString::number(blockNumber + 1);
            if (blockNumber == curLine)
            {
                painter.setPen(Qt::black);
            }
            else
            {
                painter.setPen(Qt::gray);
            }

            painter.drawText(0, top, lineNumberArea->width(), fontMetrics().height(),
                             Qt::AlignHCenter, number);
        }

        block = block.next();
        top = bottom;
        bottom = top + (int) blockBoundingRect(block).height();
        ++blockNumber;
    }
}