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#include "./clearplaintextedit.h"
#include <QHBoxLayout>
#include <QScrollBar>
#include <QStyle>
#include <QStyleOptionFrame>
using namespace std;
namespace QtUtilities {
/*!
* \class ClearPlainTextEdit
* \brief A QPlainTextEdit with an embedded button for clearing its contents.
*/
/*!
* \brief Constructs a clear plain text edit.
*/
ClearPlainTextEdit::ClearPlainTextEdit(QWidget *parent)
: QPlainTextEdit(parent)
, ButtonOverlay(viewport())
{
handleCustomLayoutCreated();
ButtonOverlay::setClearButtonEnabled(true);
}
/*!
* \brief Destroys the clear plain text edit.
*/
ClearPlainTextEdit::~ClearPlainTextEdit()
{
}
/*!
* \brief Updates the visibility of the clear button.
*/
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
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