code_editor_minimap.cpp

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#include "gui/code_editor/code_editor_minimap.h"
 
#include "gui/code_editor/code_editor.h"
#include "gui/code_editor/minimap_scrollbar.h"
#include "gui/hal_qt_compat/hal_qt_compat.h"
 
#include <QPainter>
#include <QStyleOption>
#include <QTextBlock>
 
#include <cmath>
#include <math.h>
 
#include <QDebug>
namespace hal
{
    CodeEditorMinimap::CodeEditorMinimap(CodeEditor* editor)
        : QWidget(editor), mEditor(editor), mDocument(new QTextDocument()), mScrollbar(new MinimapScrollbar(this)), mDocumentHeight(0), mOffset(0)
    {
        connect(mEditor->document(), &QTextDocument::contentsChange, this, &CodeEditorMinimap::handleContentsChange);
        connect(mDocument->documentLayout(), &QAbstractTextDocumentLayout::documentSizeChanged, this, &CodeEditorMinimap::handleDocumentSizeChanged);
 
        mDocument->setDocumentMargin(0);
        mScrollbar->show();
 
        repolish();
    }
 
    MinimapScrollbar* CodeEditorMinimap::scrollbar()
    {
        return mScrollbar;
    }
 
    QTextDocument* CodeEditorMinimap::document()
    {
        return mDocument;
    }
 
    void CodeEditorMinimap::adjustSliderHeight(int viewport_height)
    {
        Q_UNUSED(viewport_height);
 
        qDebug() << "editor " << mEditor->document()->documentLayout()->documentSize().height();
        qDebug() << "mini " << mDocument->documentLayout()->documentSize().height();
 
        qreal ratio = mEditor->document()->documentLayout()->documentSize().height() / mDocument->documentLayout()->documentSize().height();    // UNEXPECTED RESULT, MAKES NO SENSE
 
        mScrollbar->setSliderHeight(std::round(mEditor->viewport()->contentsRect().height() * ratio));
    }
 
    void CodeEditorMinimap::adjustSliderHeight(qreal ratio)
    {
        mScrollbar->setSliderHeight(std::round(ratio * mDocument->documentLayout()->blockBoundingRect(mDocument->firstBlock()).height()));
        resizeScrollbar();
    }
 
    void CodeEditorMinimap::adjustSliderHeight(int first_visible_block, int last_visible_block)
    {
        qDebug() << "first block: " + QString::number(first_visible_block);
        qDebug() << "last block: " + QString::number(last_visible_block);
 
        qreal top    = mDocument->documentLayout()->blockBoundingRect(mDocument->findBlockByNumber(first_visible_block)).top();
        qreal bottom = mDocument->documentLayout()->blockBoundingRect(mDocument->findBlockByNumber(last_visible_block)).bottom();
 
        qDebug() << "top: " + QString::number(top);
        qDebug() << "bottom: " + QString::number(bottom);
 
        mScrollbar->setSliderHeight(std::round(bottom - top));
    }
 
    void CodeEditorMinimap::handleDocumentSizeChanged(const QSizeF& new_size)
    {
        mDocumentHeight = std::ceil(new_size.height());
        resizeScrollbar();
    }
 
    void CodeEditorMinimap::handleContentsChange(int position, int chars_removed, int chars_added)
    {
        QTextCursor cursor = QTextCursor(mDocument);
        cursor.setPosition(position);
 
        if (chars_removed)
        {
            cursor.movePosition(QTextCursor::NextCharacter, QTextCursor::KeepAnchor, chars_removed);
            cursor.removeSelectedText();
        }
 
        if (chars_added)
            cursor.insertText(mEditor->document()->toPlainText().mid(position, chars_added));
    }
 
    void CodeEditorMinimap::paintEvent(QPaintEvent* event)
    {
        Q_UNUSED(event)
 
        QStyleOption opt;
        QtCompat::styleOptionInit(opt,this);
        QPainter painter(this);
        style()->drawPrimitive(QStyle::PE_Widget, &opt, &painter, this);
 
        painter.setClipping(true);
        painter.setClipRect(rect());
 
        QAbstractTextDocumentLayout::PaintContext ctx;
        ctx.palette.setColor(QPalette::Text, palette().text().color());
 
        if (mDocumentHeight > height())
        {
            int block_number    = mEditor->first_visible_block();
            int sliderPosition = mScrollbar->sliderPosition();
            mOffset            = mDocument->documentLayout()->blockBoundingRect(mDocument->findBlockByNumber(block_number)).top() - sliderPosition;
            painter.translate(0, -mOffset);
 
            ctx.clip = QRectF(0, mOffset, width(), height());
        }
 
        mDocument->documentLayout()->draw(&painter, ctx);
    }
 
    void CodeEditorMinimap::resizeEvent(QResizeEvent* event)
    {
        Q_UNUSED(event)
 
        resizeScrollbar();
    }
 
    void CodeEditorMinimap::mousePressEvent(QMouseEvent* event)
    {
        int position = mDocument->documentLayout()->hitTest(QPointF(event->pos().x(), event->pos().y() + mOffset), Qt::FuzzyHit);
        QTextCursor cursor(mDocument);
        cursor.setPosition(position);
        mEditor->centerOnLine(cursor.blockNumber());
    }
 
    void CodeEditorMinimap::wheelEvent(QWheelEvent* event)
    {
        mEditor->handleWheelEvent(event);
    }
 
    void CodeEditorMinimap::resizeScrollbar()
    {
        if (mDocumentHeight < height())
            mScrollbar->resize(width(), std::max(mScrollbar->sliderHeight(), mDocumentHeight));
        else
            mScrollbar->resize(width(), height());
    }
 
    void CodeEditorMinimap::repolish()
    {
        QStyle* s = style();
 
        s->unpolish(this);
        s->polish(this);
 
        mDocument->setDefaultFont(font());
    }
}