SvgChangeTextPathInfoStrategy.cpp

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/*
 * SPDX-FileCopyrightText: 2025 Wolthera van Hövell tot Westerflier <griffinvalley@gmail.com>
 *
 * SPDX-License-Identifier: GPL-3.0-or-later
 */
#include "SvgChangeTextPathInfoStrategy.h"
 
#include "SvgTextPathInfoChangeCommand.h"
#include <KoPathSegment.h>
#include <KoPathShape.h>
#include <KoToolBase.h>
#include "SvgTextTool.h"
#include <qmath.h>
#include <QDebug>
 
SvgChangeTextPathInfoStrategy::SvgChangeTextPathInfoStrategy(SvgTextTool *tool, KoSvgTextShape *shape, const QPointF &clicked, int textCursorPos)
    :KoInteractionStrategy(tool)
    , m_shape(shape)
    , m_currentMousePos(clicked)
    , m_textCursorPos(textCursorPos)
{
    KoSvgTextNodeIndex index = m_shape->topLevelNodeForPos(m_textCursorPos);
    m_oldInfo = *(index.textPathInfo());
 
}
 
void SvgChangeTextPathInfoStrategy::handleMouseMove(const QPointF &mouseLocation, Qt::KeyboardModifiers modifiers)
{
    Q_UNUSED(modifiers)
 
    m_currentMousePos = mouseLocation;
 
    KUndo2Command *cmd = createCommand();
    if (cmd) {
        cmd->redo();
    }
    tool()->repaintDecorations();
}
 
KUndo2Command *SvgChangeTextPathInfoStrategy::createCommand()
{
    SvgTextTool *const tool = qobject_cast<SvgTextTool *>(this->tool());
    KoSvgTextNodeIndex index = m_shape->topLevelNodeForPos(m_textCursorPos);
    KoShape *shape = index.textPath();
    if (!shape) {
        return nullptr;
    }
 
    KoPathShape *path = dynamic_cast<KoPathShape*>(shape);
    KoSvgText::TextOnPathInfo info;
 
    const qreal grab = tool->grabSensitivityInPt()*4;
    QRectF roi = QRect(0, 0, grab, grab);
    roi.moveCenter(m_currentMousePos);
    KoPathSegment segment = path->segmentAtPoint(m_currentMousePos, roi);
 
    if (!segment.isValid()) {
        return nullptr;
    }
 
    QList<KoPathSegment> segments = path->segmentsAt(path->outlineRect().adjusted(-grab, -grab, grab, grab));
 
    double length = 0;
    Q_FOREACH(KoPathSegment s, segments) {
        if (s == segment) {
            const QPointF mouseInShape = path->documentToShape(m_currentMousePos);
            const qreal t = segment.nearestPoint(mouseInShape);
            info.startOffset = length + (t * segment.length());
 
            const QLineF l = QLineF(segment.pointAt(t), mouseInShape).unitVector();
            const QVector2D p1(l.p2()-l.p1());
            const QVector2D tangent = QVector2D(segment.angleVectorAtParam(t));
            const QVector2D normal(-tangent.y(), tangent.x());
            float dot = QVector2D::dotProduct(p1, normal);
            if (dot <= 0) {
                info.side = KoSvgText::TextPathSideRight;
            } else {
                info.side = KoSvgText::TextPathSideLeft;
            }
        }
        length += s.length();
    }
    if (info.side == KoSvgText::TextPathSideRight) {
        info.startOffset = length - info.startOffset;
    }
 
    KUndo2Command *cmd = new SvgTextPathInfoChangeCommand(m_shape, m_textCursorPos, info);
    cmd->setText(kundo2_i18n("Change Text On Path Position"));
    return cmd;
}
 
void SvgChangeTextPathInfoStrategy::cancelInteraction()
{
    KUndo2Command *cmd = new SvgTextPathInfoChangeCommand(m_shape, m_textCursorPos, m_oldInfo);
    if (cmd) {
        cmd->undo();
    }
    tool()->repaintDecorations();
}
 
void SvgChangeTextPathInfoStrategy::finishInteraction(Qt::KeyboardModifiers modifiers)
{
 
}