clearplaintextedit.cpp

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#include "./clearplaintextedit.h"
 
#include <QHBoxLayout>
#include <QScrollBar>
#include <QStyle>
#include <QStyleOptionFrame>
 
using namespace std;
 
namespace QtUtilities {
 
ClearPlainTextEdit::ClearPlainTextEdit(QWidget *parent)
    : QPlainTextEdit(parent)
    , ButtonOverlay(viewport())
{
    handleCustomLayoutCreated();
    ButtonOverlay::setClearButtonEnabled(true);
}
 
ClearPlainTextEdit::~ClearPlainTextEdit()
{
}
 
void ClearPlainTextEdit::handleTextChanged()
{
    updateClearButtonVisibility(!document()->isEmpty());
}
 
void ClearPlainTextEdit::handleClearButtonClicked()
{
    // do no call clear() here to prevent clearing of undo history
    QTextCursor cursor(document());
    cursor.select(QTextCursor::Document);
    cursor.removeSelectedText();
}
 
void ClearPlainTextEdit::handleCustomLayoutCreated()
{
    // set alignment to show buttons in the bottom right corner
    ButtonOverlay::buttonLayout()->setAlignment(Qt::AlignBottom | Qt::AlignRight);
    const QStyle *const s = style();
    QStyleOptionFrame opt;
    opt.initFrom(this);
    setContentsMarginsFromEditFieldRectAndFrameWidth(s->subElementRect(QStyle::SE_FrameContents, &opt, this),
        s->pixelMetric(QStyle::PM_DefaultFrameWidth, &opt, m_widget), s->pixelMetric(QStyle::PM_LayoutVerticalSpacing, &opt, m_widget));
    connect(this, &QPlainTextEdit::textChanged, this, &ClearPlainTextEdit::handleTextChanged);
    // ensure button layout is realigned when scrolling
    connect(verticalScrollBar(), &QScrollBar::actionTriggered, this, &ClearPlainTextEdit::handleScroll);
    connect(this, &QPlainTextEdit::cursorPositionChanged, this, &ClearPlainTextEdit::handleScroll);
}
 
void ClearPlainTextEdit::handleScroll()
{
    buttonLayout()->update();
}
 
bool ClearPlainTextEdit::isCleared() const
{
    return document()->isEmpty();
}
 
} // namespace QtUtilities