viewer_text.cpp

/*
 * Widget for viewing plain text content.
 * Copyright (c) 2021-2026 Benjamin Johnson
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include <QtCore>
#include <QtWidgets>

#include "viewer_text.h"
#include "renderer.h"

TextContentViewer::TextContentViewer(QWidget *parent)
    : QPlainTextEdit(parent)
{
    setFont(QFontDatabase::systemFont(QFontDatabase::FixedFont));
    setReadOnly(true);
    setTabChangesFocus(true);
    setWordWrapMode(QTextOption::WordWrap);

    renderer = nullptr;
    initialFontSize = font().pointSize();
}

void TextContentViewer::setRenderer(Renderer *replacement)
{
    if (replacement != nullptr
        && replacement->mode() == Renderer::TextContent) {
        renderer = (TextContentRenderer*)replacement;

        connect(renderer, &TextContentRenderer::renderedText,
                this, &TextContentViewer::setPlainText);
    } else
        renderer = nullptr;
}

void TextContentViewer::display()
{
    QTimer::singleShot(0, renderer, &TextContentRenderer::render);
}

void TextContentViewer::setZoomFactor(int percent)
{
    QFont newFont = font();
    newFont.setPointSize(initialFontSize * percent / 100);
    setFont(newFont);
}

void TextContentViewer::wheelEvent(QWheelEvent *event)
{
    // Adapted from QPlainTextEdit::wheelEvent()
    if (event->modifiers() & Qt::ControlModifier) {
        // Instead of processing this directly, we go through the main
        // Viewer widget to keep all sub-widgets in sync
        float delta = event->angleDelta().y() / 120.f;
        emit wheelZoomed(delta);
        return;
    }
    QPlainTextEdit::wheelEvent(event);
}