qlineedit.cpp

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#include "qlineedit.h"
#include "qlineedit_p.h"
 
#if QT_CONFIG(action)
#  include "qaction.h"
#endif
#include "qapplication.h"
#include "qclipboard.h"
#if QT_CONFIG(draganddrop)
#include <qdrag.h>
#endif
#include "qdrawutil.h"
#include "qevent.h"
#include "qfontmetrics.h"
#include "qstylehints.h"
#if QT_CONFIG(menu)
#include "qmenu.h"
#endif
#include "qpainter.h"
#include "qpixmap.h"
#include "qpointer.h"
#include "qstringlist.h"
#include "qstyle.h"
#include "qstyleoption.h"
#include "qtimer.h"
#include "qvalidator.h"
#include "qvariant.h"
#include "qdebug.h"
#if QT_CONFIG(textedit)
#include "qtextedit.h"
#include <private/qtextedit_p.h>
#endif
#include <private/qwidgettextcontrol_p.h>
 
#if QT_CONFIG(accessibility)
#include "qaccessible.h"
#endif
#if QT_CONFIG(itemviews)
#include "qabstractitemview.h"
#endif
#include "private/qstylesheetstyle_p.h"
 
#if QT_CONFIG(shortcut)
#include "private/qapplication_p.h"
#include "private/qshortcutmap_p.h"
#include "qkeysequence.h"
#define ACCEL_KEY(k) (!QCoreApplication::testAttribute(Qt::AA_DontShowShortcutsInContextMenus) \
                      && !QGuiApplicationPrivate::instance()->shortcutMap.hasShortcutForKeySequence(k) ? \
                      u'\t' + QKeySequence(k).toString(QKeySequence::NativeText) : QString())
#else
#define ACCEL_KEY(k) QString()
#endif
 
#include <limits.h>
#ifdef DrawText
#undef DrawText
#endif
 
QT_BEGIN_NAMESPACE
 
using namespace Qt::StringLiterals;
 
void QLineEdit::initStyleOption(QStyleOptionFrame *option) const
{
    if (!option)
        return;
 
    Q_D(const QLineEdit);
    option->initFrom(this);
    option->rect = contentsRect();
    option->lineWidth = d->frame ? style()->pixelMetric(QStyle::PM_DefaultFrameWidth, option, this)
                                 : 0;
    option->midLineWidth = 0;
    option->state |= QStyle::State_Sunken;
    if (d->control->isReadOnly())
        option->state |= QStyle::State_ReadOnly;
#ifdef QT_KEYPAD_NAVIGATION
    if (hasEditFocus())
        option->state |= QStyle::State_HasEditFocus;
#endif
    option->features = QStyleOptionFrame::None;
}
 
QLineEdit::QLineEdit(QWidget* parent)
    : QLineEdit(QString(), parent)
{
}
 
QLineEdit::QLineEdit(const QString& contents, QWidget* parent)
    : QWidget(*new QLineEditPrivate, parent, { })
{
    Q_D(QLineEdit);
    d->init(contents);
}
 
 
 
QLineEdit::~QLineEdit()
{
}
 
 
QString QLineEdit::text() const
{
    Q_D(const QLineEdit);
    return d->control->text();
}
 
void QLineEdit::setText(const QString& text)
{
    Q_D(QLineEdit);
    d->setText(text);
}
 
QString QLineEdit::placeholderText() const
{
    Q_D(const QLineEdit);
    return d->placeholderText;
}
 
void QLineEdit::setPlaceholderText(const QString& placeholderText)
{
    Q_D(QLineEdit);
    if (d->placeholderText != placeholderText) {
        d->placeholderText = placeholderText;
        if (d->shouldShowPlaceholderText())
            update();
    }
}
 
QString QLineEdit::displayText() const
{
    Q_D(const QLineEdit);
    return d->control->displayText();
}
 
 
int QLineEdit::maxLength() const
{
    Q_D(const QLineEdit);
    return d->control->maxLength();
}
 
void QLineEdit::setMaxLength(int maxLength)
{
    Q_D(QLineEdit);
    d->control->setMaxLength(maxLength);
}
 
bool QLineEdit::hasFrame() const
{
    Q_D(const QLineEdit);
    return d->frame;
}
 
#if QT_CONFIG(action)
void QLineEdit::addAction(QAction *action, ActionPosition position)
{
    Q_D(QLineEdit);
    QWidget::addAction(action);
    d->addAction(action, nullptr, position);
}
 
QAction *QLineEdit::addAction(const QIcon &icon, ActionPosition position)
{
    QAction *result = new QAction(icon, QString(), this);
    addAction(result, position);
    return result;
}
#endif // QT_CONFIG(action)
static const char clearButtonActionNameC[] = "_q_qlineeditclearaction";
 
void QLineEdit::setClearButtonEnabled(bool enable)
{
#if QT_CONFIG(action)
    Q_D(QLineEdit);
    if (enable == isClearButtonEnabled())
        return;
    if (enable) {
        QAction *clearAction = new QAction(d->clearButtonIcon(), QString(), this);
        clearAction->setEnabled(!isReadOnly());
        clearAction->setObjectName(QLatin1StringView(clearButtonActionNameC));
 
        int flags = QLineEditPrivate::SideWidgetClearButton | QLineEditPrivate::SideWidgetFadeInWithText;
        auto widgetAction = d->addAction(clearAction, nullptr, QLineEdit::TrailingPosition, flags);
        widgetAction->setVisible(!text().isEmpty());
    } else {
        QAction *clearAction = findChild<QAction *>(QLatin1StringView(clearButtonActionNameC));
        Q_ASSERT(clearAction);
        d->removeAction(clearAction);
        delete clearAction;
    }
#else
    Q_UNUSED(enable);
#endif // QT_CONFIG(action)
}
 
bool QLineEdit::isClearButtonEnabled() const
{
#if QT_CONFIG(action)
    return findChild<QAction *>(QLatin1StringView(clearButtonActionNameC));
#else
    return false;
#endif
}
 
void QLineEdit::setFrame(bool enable)
{
    Q_D(QLineEdit);
    d->frame = enable;
    update();
    updateGeometry();
}
 
 
QLineEdit::EchoMode QLineEdit::echoMode() const
{
    Q_D(const QLineEdit);
    return (EchoMode) d->control->echoMode();
}
 
void QLineEdit::setEchoMode(EchoMode mode)
{
    Q_D(QLineEdit);
    if (mode == (EchoMode)d->control->echoMode())
        return;
    Qt::InputMethodHints imHints = inputMethodHints();
    imHints.setFlag(Qt::ImhHiddenText, mode == Password || mode == NoEcho);
    imHints.setFlag(Qt::ImhNoAutoUppercase, mode != Normal);
    imHints.setFlag(Qt::ImhNoPredictiveText, mode != Normal);
    imHints.setFlag(Qt::ImhSensitiveData, mode != Normal);
    setInputMethodHints(imHints);
    d->control->setEchoMode(mode);
    update();
}
 
 
#ifndef QT_NO_VALIDATOR
const QValidator * QLineEdit::validator() const
{
    Q_D(const QLineEdit);
    return d->control->validator();
}
 
void QLineEdit::setValidator(const QValidator *v)
{
    Q_D(QLineEdit);
    d->control->setValidator(v);
}
#endif // QT_NO_VALIDATOR
 
#if QT_CONFIG(completer)
void QLineEdit::setCompleter(QCompleter *c)
{
    Q_D(QLineEdit);
    if (c == d->control->completer())
        return;
    if (d->control->completer()) {
        d->disconnectCompleter();
        d->control->completer()->setWidget(nullptr);
        if (d->control->completer()->parent() == this)
            delete d->control->completer();
    }
    d->control->setCompleter(c);
    if (!c)
        return;
    if (c->widget() == nullptr)
        c->setWidget(this);
    if (hasFocus())
        d->connectCompleter();
}
 
QCompleter *QLineEdit::completer() const
{
    Q_D(const QLineEdit);
    return d->control->completer();
}
 
#endif // QT_CONFIG(completer)
 
QSize QLineEdit::sizeHint() const
{
    Q_D(const QLineEdit);
    ensurePolished();
    QFontMetrics fm(font());
    const int iconSize = style()->pixelMetric(QStyle::PM_SmallIconSize, nullptr, this);
    const QMargins tm = d->effectiveTextMargins();
    int h = qMax(fm.height(), qMax(14, iconSize - 2)) + 2 * QLineEditPrivate::verticalMargin
            + tm.top() + tm.bottom()
            + d->topmargin + d->bottommargin;
    int w = fm.horizontalAdvance(u'x') * 17 + 2 * QLineEditPrivate::horizontalMargin
            + tm.left() + tm.right()
            + d->leftmargin + d->rightmargin; // "some"
    QStyleOptionFrame opt;
    initStyleOption(&opt);
    return style()->sizeFromContents(QStyle::CT_LineEdit, &opt, QSize(w, h), this);
}
 
 
QSize QLineEdit::minimumSizeHint() const
{
    Q_D(const QLineEdit);
    ensurePolished();
    QFontMetrics fm = fontMetrics();
    const QMargins tm = d->effectiveTextMargins();
    int h = fm.height() + qMax(2 * QLineEditPrivate::verticalMargin, fm.leading())
            + tm.top() + tm.bottom()
            + d->topmargin + d->bottommargin;
    int w = fm.maxWidth() + 2 * QLineEditPrivate::horizontalMargin
            + tm.left() + tm.right()
            + d->leftmargin + d->rightmargin;
    QStyleOptionFrame opt;
    initStyleOption(&opt);
    return style()->sizeFromContents(QStyle::CT_LineEdit, &opt, QSize(w, h), this);
}
 
 
int QLineEdit::cursorPosition() const
{
    Q_D(const QLineEdit);
    return d->control->cursorPosition();
}
 
void QLineEdit::setCursorPosition(int pos)
{
    Q_D(QLineEdit);
    d->control->setCursorPosition(pos);
}
 
// ### What should this do if the point is outside of contentsRect? Currently returns 0.
int QLineEdit::cursorPositionAt(const QPoint &pos)
{
    Q_D(QLineEdit);
    return d->xToPos(pos.x());
}
 
 
 
Qt::Alignment QLineEdit::alignment() const
{
    Q_D(const QLineEdit);
    return QFlag(d->alignment);
}
 
void QLineEdit::setAlignment(Qt::Alignment alignment)
{
    Q_D(QLineEdit);
    d->alignment = alignment;
    update();
}
 
 
void QLineEdit::cursorForward(bool mark, int steps)
{
    Q_D(QLineEdit);
    d->control->cursorForward(mark, steps);
}
 
 
void QLineEdit::cursorBackward(bool mark, int steps)
{
    cursorForward(mark, -steps);
}
 
void QLineEdit::cursorWordForward(bool mark)
{
    Q_D(QLineEdit);
    d->control->cursorWordForward(mark);
}
 
void QLineEdit::cursorWordBackward(bool mark)
{
    Q_D(QLineEdit);
    d->control->cursorWordBackward(mark);
}
 
 
void QLineEdit::backspace()
{
    Q_D(QLineEdit);
    d->control->backspace();
}
 
void QLineEdit::del()
{
    Q_D(QLineEdit);
    d->control->del();
}
 
void QLineEdit::home(bool mark)
{
    Q_D(QLineEdit);
    d->control->home(mark);
}
 
void QLineEdit::end(bool mark)
{
    Q_D(QLineEdit);
    d->control->end(mark);
}
 
 
bool QLineEdit::isModified() const
{
    Q_D(const QLineEdit);
    return d->control->isModified();
}
 
void QLineEdit::setModified(bool modified)
{
    Q_D(QLineEdit);
    d->control->setModified(modified);
}
 
bool QLineEdit::hasSelectedText() const
{
    Q_D(const QLineEdit);
    return d->control->hasSelectedText();
}
 
QString QLineEdit::selectedText() const
{
    Q_D(const QLineEdit);
    return d->control->selectedText();
}
 
int QLineEdit::selectionStart() const
{
    Q_D(const QLineEdit);
    return d->control->selectionStart();
}
 
int QLineEdit::selectionEnd() const
{
   Q_D(const QLineEdit);
   return d->control->selectionEnd();
}
 
int QLineEdit::selectionLength() const
{
   return selectionEnd() - selectionStart();
}
 
void QLineEdit::setSelection(int start, int length)
{
    Q_D(QLineEdit);
    if (Q_UNLIKELY(start < 0 || start > (int)d->control->end())) {
        qWarning("QLineEdit::setSelection: Invalid start position (%d)", start);
        return;
    }
 
    d->control->setSelection(start, length);
 
    if (d->control->hasSelectedText()){
        QStyleOptionFrame opt;
        initStyleOption(&opt);
        if (!style()->styleHint(QStyle::SH_BlinkCursorWhenTextSelected, &opt, this))
            d->setCursorVisible(false);
    }
}
 
 
bool QLineEdit::isUndoAvailable() const
{
    Q_D(const QLineEdit);
    return d->control->isUndoAvailable();
}
 
bool QLineEdit::isRedoAvailable() const
{
    Q_D(const QLineEdit);
    return d->control->isRedoAvailable();
}
 
bool QLineEdit::dragEnabled() const
{
    Q_D(const QLineEdit);
    return d->dragEnabled;
}
 
void QLineEdit::setDragEnabled(bool b)
{
    Q_D(QLineEdit);
    d->dragEnabled = b;
}
 
Qt::CursorMoveStyle QLineEdit::cursorMoveStyle() const
{
    Q_D(const QLineEdit);
    return d->control->cursorMoveStyle();
}
 
void QLineEdit::setCursorMoveStyle(Qt::CursorMoveStyle style)
{
    Q_D(QLineEdit);
    d->control->setCursorMoveStyle(style);
}
 
bool QLineEdit::hasAcceptableInput() const
{
    Q_D(const QLineEdit);
    return d->control->hasAcceptableInput();
}
 
void QLineEdit::setTextMargins(int left, int top, int right, int bottom)
{
    setTextMargins({left, top, right, bottom});
}
 
void QLineEdit::setTextMargins(const QMargins &margins)
{
    Q_D(QLineEdit);
    d->textMargins = margins;
    updateGeometry();
    update();
}
 
QMargins QLineEdit::textMargins() const
{
    Q_D(const QLineEdit);
    return d->textMargins;
}
 
QString QLineEdit::inputMask() const
{
    Q_D(const QLineEdit);
    return d->control->inputMask();
}
 
void QLineEdit::setInputMask(const QString &inputMask)
{
    Q_D(QLineEdit);
    d->control->setInputMask(inputMask);
}
 
void QLineEdit::selectAll()
{
    Q_D(QLineEdit);
    d->control->selectAll();
}
 
void QLineEdit::deselect()
{
    Q_D(QLineEdit);
    d->control->deselect();
}
 
 
void QLineEdit::insert(const QString &newText)
{
//     q->resetInputContext(); //#### FIX ME IN QT
    Q_D(QLineEdit);
    d->control->insert(newText);
}
 
void QLineEdit::clear()
{
    Q_D(QLineEdit);
    d->resetInputMethod();
    d->control->clear();
}
 
void QLineEdit::undo()
{
    Q_D(QLineEdit);
    d->resetInputMethod();
    d->control->undo();
}
 
void QLineEdit::redo()
{
    Q_D(QLineEdit);
    d->resetInputMethod();
    d->control->redo();
}
 
 
bool QLineEdit::isReadOnly() const
{
    Q_D(const QLineEdit);
    return d->control->isReadOnly();
}
 
void QLineEdit::setReadOnly(bool enable)
{
    Q_D(QLineEdit);
    if (d->control->isReadOnly() != enable) {
        d->control->setReadOnly(enable);
        d->setClearButtonEnabled(!enable);
        setAttribute(Qt::WA_MacShowFocusRect, !enable);
        setAttribute(Qt::WA_InputMethodEnabled, d->shouldEnableInputMethod());
#ifndef QT_NO_CURSOR
        setCursor(enable ? Qt::ArrowCursor : Qt::IBeamCursor);
#endif
        QEvent event(QEvent::ReadOnlyChange);
        QCoreApplication::sendEvent(this, &event);
        update();
#if QT_CONFIG(accessibility)
        QAccessible::State changedState;
        changedState.readOnly = true;
        QAccessibleStateChangeEvent ev(this, changedState);
        QAccessible::updateAccessibility(&ev);
#endif
    }
}
 
 
#ifndef QT_NO_CLIPBOARD
void QLineEdit::cut()
{
    if (hasSelectedText()) {
        copy();
        del();
    }
}
 
 
void QLineEdit::copy() const
{
    Q_D(const QLineEdit);
    d->control->copy();
}
 
void QLineEdit::paste()
{
    Q_D(QLineEdit);
    d->control->paste();
}
 
#endif // !QT_NO_CLIPBOARD
 
void QLineEdit::timerEvent(QTimerEvent *e)
{
    Q_D(QLineEdit);
    int timerId = ((QTimerEvent*)e)->timerId();
    if (false) {
#if QT_CONFIG(draganddrop)
    } else if (timerId == d->dndTimer.timerId()) {
        d->drag();
#endif
    }
    else if (timerId == d->tripleClickTimer.timerId())
        d->tripleClickTimer.stop();
}
 
bool QLineEdit::event(QEvent * e)
{
    Q_D(QLineEdit);
    if (e->type() == QEvent::ContextMenu) {
#ifndef QT_NO_IM
        if (d->control->composeMode())
            return true;
#endif
        //d->separate();
    } else if (e->type() == QEvent::WindowActivate) {
        QTimer::singleShot(0, this, [this]() {
            Q_D(QLineEdit);
            d->handleWindowActivate();
        });
#ifndef QT_NO_SHORTCUT
    } else if (e->type() == QEvent::ShortcutOverride) {
        QKeyEvent *ke = static_cast<QKeyEvent*>(e);
        d->control->processShortcutOverrideEvent(ke);
#endif
    } else if (e->type() == QEvent::Show) {
        //In order to get the cursor blinking if QComboBox::setEditable is called when the combobox has focus
        if (hasFocus()) {
            d->control->setBlinkingCursorEnabled(true);
            QStyleOptionFrame opt;
            initStyleOption(&opt);
            if ((!hasSelectedText() && d->control->preeditAreaText().isEmpty())
                || style()->styleHint(QStyle::SH_BlinkCursorWhenTextSelected, &opt, this))
                d->setCursorVisible(true);
        }
    } else if (e->type() == QEvent::Hide) {
        d->control->setBlinkingCursorEnabled(false);
#if QT_CONFIG(action)
    } else if (e->type() == QEvent::ActionRemoved) {
        d->removeAction(static_cast<QActionEvent *>(e)->action());
#endif
    } else if (e->type() == QEvent::Resize) {
        d->positionSideWidgets();
    } else if (e->type() == QEvent::StyleChange) {
        d->initMouseYThreshold();
    }
#ifdef QT_KEYPAD_NAVIGATION
    if (QApplicationPrivate::keypadNavigationEnabled()) {
        if (e->type() == QEvent::EnterEditFocus) {
            end(false);
            d->setCursorVisible(true);
            d->control->setCursorBlinkEnabled(true);
        } else if (e->type() == QEvent::LeaveEditFocus) {
            d->setCursorVisible(false);
            d->control->setCursorBlinkEnabled(false);
            if (d->edited && (d->control->hasAcceptableInput()
                              || d->control->fixup())) {
                emit editingFinished();
                d->edited = false;
            }
        }
    }
#endif
    return QWidget::event(e);
}
 
void QLineEdit::mousePressEvent(QMouseEvent* e)
{
    Q_D(QLineEdit);
 
    d->mousePressPos = e->position().toPoint();
 
    if (d->sendMouseEventToInputContext(e))
        return;
    if (e->button() == Qt::RightButton)
        return;
#ifdef QT_KEYPAD_NAVIGATION
    if (QApplication::QApplicationPrivate() && !hasEditFocus()) {
        setEditFocus(true);
        // Get the completion list to pop up.
        if (d->control->completer())
            d->control->completer()->complete();
    }
#endif
    if (d->tripleClickTimer.isActive() && (e->position().toPoint() - d->tripleClick).manhattanLength() <
         QApplication::startDragDistance()) {
        selectAll();
        return;
    }
    bool mark = e->modifiers() & Qt::ShiftModifier;
#ifdef Q_OS_ANDROID
    mark = mark && (d->imHints & Qt::ImhNoPredictiveText);
#endif // Q_OS_ANDROID
    int cursor = d->xToPos(e->position().toPoint().x());
#if QT_CONFIG(draganddrop)
    if (!mark && d->dragEnabled && d->control->echoMode() == Normal &&
         e->button() == Qt::LeftButton && d->inSelection(e->position().toPoint().x())) {
        if (!d->dndTimer.isActive())
            d->dndTimer.start(QApplication::startDragTime(), this);
    } else
#endif
    {
        d->control->moveCursor(cursor, mark);
    }
}
 
void QLineEdit::mouseMoveEvent(QMouseEvent * e)
{
    Q_D(QLineEdit);
 
    if (e->buttons() & Qt::LeftButton) {
#if QT_CONFIG(draganddrop)
        if (d->dndTimer.isActive()) {
            if ((d->mousePressPos - e->position().toPoint()).manhattanLength() > QApplication::startDragDistance())
                d->drag();
        } else
#endif
        {
#ifndef Q_OS_ANDROID
            const bool select = true;
#else
            const bool select = (d->imHints & Qt::ImhNoPredictiveText);
#endif
#ifndef QT_NO_IM
            if (d->mouseYThreshold > 0 && e->position().toPoint().y() > d->mousePressPos.y() + d->mouseYThreshold) {
                if (layoutDirection() == Qt::RightToLeft)
                    d->control->home(select);
                else
                    d->control->end(select);
            } else if (d->mouseYThreshold > 0 && e->position().toPoint().y() + d->mouseYThreshold < d->mousePressPos.y()) {
                if (layoutDirection() == Qt::RightToLeft)
                    d->control->end(select);
                else
                    d->control->home(select);
            } else if (d->control->composeMode() && select) {
                int startPos = d->xToPos(d->mousePressPos.x());
                int currentPos = d->xToPos(e->position().toPoint().x());
                if (startPos != currentPos)
                    d->control->setSelection(startPos, currentPos - startPos);
 
            } else
#endif
            {
                d->control->moveCursor(d->xToPos(e->position().toPoint().x()), select);
            }
        }
    }
 
    d->sendMouseEventToInputContext(e);
}
 
void QLineEdit::mouseReleaseEvent(QMouseEvent* e)
{
    Q_D(QLineEdit);
    if (d->sendMouseEventToInputContext(e))
        return;
#if QT_CONFIG(draganddrop)
    if (e->button() == Qt::LeftButton) {
        if (d->dndTimer.isActive()) {
            d->dndTimer.stop();
            deselect();
            return;
        }
    }
#endif
#ifndef QT_NO_CLIPBOARD
    if (QGuiApplication::clipboard()->supportsSelection()) {
        if (e->button() == Qt::LeftButton) {
            d->control->copy(QClipboard::Selection);
        } else if (!d->control->isReadOnly() && e->button() == Qt::MiddleButton) {
            deselect();
            d->control->paste(QClipboard::Selection);
        }
    }
#endif
 
    if (!isReadOnly() && rect().contains(e->position().toPoint()))
        d->handleSoftwareInputPanel(e->button(), d->clickCausedFocus);
    d->clickCausedFocus = 0;
}
 
void QLineEdit::mouseDoubleClickEvent(QMouseEvent* e)
{
    Q_D(QLineEdit);
 
    if (e->button() == Qt::LeftButton) {
        int position = d->xToPos(e->position().toPoint().x());
 
        // exit composition mode
#ifndef QT_NO_IM
        if (d->control->composeMode()) {
            int preeditPos = d->control->cursor();
            int posInPreedit = position - d->control->cursor();
            int preeditLength = d->control->preeditAreaText().size();
            bool positionOnPreedit = false;
 
            if (posInPreedit >= 0 && posInPreedit <= preeditLength)
                positionOnPreedit = true;
 
            int textLength = d->control->end();
            d->control->commitPreedit();
            int sizeChange = d->control->end() - textLength;
 
            if (positionOnPreedit) {
                if (sizeChange == 0)
                    position = -1; // cancel selection, word disappeared
                else
                    // ensure not selecting after preedit if event happened there
                    position = qBound(preeditPos, position, preeditPos + sizeChange);
            } else if (position > preeditPos) {
                // adjust positions after former preedit by how much text changed
                position += (sizeChange - preeditLength);
            }
        }
#endif
 
        if (position >= 0)
            d->control->selectWordAtPos(position);
 
        d->tripleClickTimer.start(QApplication::doubleClickInterval(), this);
        d->tripleClick = e->position().toPoint();
    } else {
        d->sendMouseEventToInputContext(e);
    }
}
 
void QLineEdit::keyPressEvent(QKeyEvent *event)
{
    Q_D(QLineEdit);
    #ifdef QT_KEYPAD_NAVIGATION
    bool select = false;
    switch (event->key()) {
        case Qt::Key_Select:
            if (QApplicationPrivate::keypadNavigationEnabled()) {
                if (hasEditFocus()) {
                    setEditFocus(false);
                    if (d->control->completer() && d->control->completer()->popup()->isVisible())
                        d->control->completer()->popup()->hide();
                    select = true;
                }
            }
            break;
        case Qt::Key_Back:
        case Qt::Key_No:
            if (!QApplicationPrivate::keypadNavigationEnabled() || !hasEditFocus()) {
                event->ignore();
                return;
            }
            break;
        default:
            if (QApplicationPrivate::keypadNavigationEnabled()) {
                if (!hasEditFocus() && !(event->modifiers() & Qt::ControlModifier)) {
                    if (!event->text().isEmpty() && event->text().at(0).isPrint()
                        && !isReadOnly())
                        setEditFocus(true);
                    else {
                        event->ignore();
                        return;
                    }
                }
            }
    }
 
 
 
    if (QApplicationPrivate::keypadNavigationEnabled() && !select && !hasEditFocus()) {
        setEditFocus(true);
        if (event->key() == Qt::Key_Select)
            return; // Just start. No action.
    }
#endif
    d->control->processKeyEvent(event);
    if (event->isAccepted())
        d->control->updateCursorBlinking();
}
 
void QLineEdit::keyReleaseEvent(QKeyEvent *e)
{
    Q_D(QLineEdit);
    if (!isReadOnly())
        d->handleSoftwareInputPanel();
    d->control->updateCursorBlinking();
    QWidget::keyReleaseEvent(e);
}
 
QRect QLineEdit::cursorRect() const
{
    Q_D(const QLineEdit);
    return d->cursorRect();
}
 
void QLineEdit::inputMethodEvent(QInputMethodEvent *e)
{
    Q_D(QLineEdit);
 
    if (echoMode() == PasswordEchoOnEdit && !d->control->passwordEchoEditing()) {
        // Clear the edit and reset to normal echo mode while entering input
        // method data; the echo mode switches back when the edit loses focus.
        // ### changes a public property, resets current content.
        d->updatePasswordEchoEditing(true);
        clear();
    }
 
#ifdef QT_KEYPAD_NAVIGATION
    // Focus in if currently in navigation focus on the widget
    // Only focus in on preedits, to allow input methods to
    // commit text as they focus out without interfering with focus
    if (QApplicationPrivate::keypadNavigationEnabled()
        && hasFocus() && !hasEditFocus()
        && !e->preeditString().isEmpty())
        setEditFocus(true);
#endif
 
    d->control->processInputMethodEvent(e);
 
#if QT_CONFIG(completer)
    if (!e->commitString().isEmpty())
        d->control->complete(Qt::Key_unknown);
#endif
}
 
QVariant QLineEdit::inputMethodQuery(Qt::InputMethodQuery property) const
{
#ifdef Q_OS_ANDROID
    // QTBUG-61652
    if (property == Qt::ImEnterKeyType) {
        QWidget *next = nextInFocusChain();
        while (next && next != this && next->focusPolicy() == Qt::NoFocus)
            next = next->nextInFocusChain();
        if (next) {
            const auto nextYPos = next->mapToGlobal(QPoint(0, 0)).y();
            const auto currentYPos = mapToGlobal(QPoint(0, 0)).y();
            if (currentYPos < nextYPos)
                // Set EnterKey to KeyNext type only if the next widget
                // in the focus chain is below current QLineEdit
                return Qt::EnterKeyNext;
        }
    }
#endif
    return inputMethodQuery(property, QVariant());
}
 
QVariant QLineEdit::inputMethodQuery(Qt::InputMethodQuery property, QVariant argument) const
{
    Q_D(const QLineEdit);
    switch(property) {
    case Qt::ImEnabled:
        return isEnabled() && !isReadOnly();
    case Qt::ImCursorRectangle:
        return d->cursorRect();
    case Qt::ImAnchorRectangle:
        return d->adjustedControlRect(d->control->anchorRect());
    case Qt::ImFont:
        return font();
    case Qt::ImAbsolutePosition:
    case Qt::ImCursorPosition: {
        const QPointF pt = argument.toPointF();
        if (!pt.isNull())
            return QVariant(d->xToPos(pt.x(), QTextLine::CursorBetweenCharacters));
        return QVariant(d->control->cursor()); }
    case Qt::ImSurroundingText:
        return QVariant(d->control->surroundingText());
    case Qt::ImCurrentSelection:
        return QVariant(selectedText());
    case Qt::ImMaximumTextLength:
        return QVariant(maxLength());
    case Qt::ImAnchorPosition:
        if (d->control->selectionStart() == d->control->selectionEnd())
            return QVariant(d->control->cursor());
        else if (d->control->selectionStart() == d->control->cursor())
            return QVariant(d->control->selectionEnd());
        else
            return QVariant(d->control->selectionStart());
    case Qt::ImReadOnly:
        return isReadOnly();
    case Qt::ImTextBeforeCursor: {
        const QPointF pt = argument.toPointF();
        if (!pt.isNull())
            return d->textBeforeCursor(d->xToPos(pt.x(), QTextLine::CursorBetweenCharacters));
        else
            return d->textBeforeCursor(d->control->cursor()); }
    case Qt::ImTextAfterCursor: {
        const QPointF pt = argument.toPointF();
        if (!pt.isNull())
            return d->textAfterCursor(d->xToPos(pt.x(), QTextLine::CursorBetweenCharacters));
        else
            return d->textAfterCursor(d->control->cursor()); }
    default:
        return QWidget::inputMethodQuery(property);
    }
}
 
void QLineEdit::focusInEvent(QFocusEvent *e)
{
    Q_D(QLineEdit);
    if (e->reason() == Qt::TabFocusReason ||
         e->reason() == Qt::BacktabFocusReason  ||
         e->reason() == Qt::ShortcutFocusReason) {
        if (!d->control->inputMask().isEmpty())
            d->control->moveCursor(d->control->nextMaskBlank(0));
        else if (!d->control->hasSelectedText())
            selectAll();
        else
            updateMicroFocus();
    } else if (e->reason() == Qt::MouseFocusReason) {
        d->clickCausedFocus = 1;
        updateMicroFocus();
    }
#ifdef QT_KEYPAD_NAVIGATION
    if (!QApplicationPrivate::keypadNavigationEnabled() || (hasEditFocus() && ( e->reason() == Qt::PopupFocusReason))) {
#endif
    d->control->setBlinkingCursorEnabled(true);
    QStyleOptionFrame opt;
    initStyleOption(&opt);
    if ((!hasSelectedText() && d->control->preeditAreaText().isEmpty())
       || style()->styleHint(QStyle::SH_BlinkCursorWhenTextSelected, &opt, this))
        d->setCursorVisible(true);
#ifdef QT_KEYPAD_NAVIGATION
        d->control->setCancelText(d->control->text());
    }
#endif
#if QT_CONFIG(completer)
    if (d->control->completer()) {
        d->control->completer()->setWidget(this);
        d->connectCompleter();
    }
#endif
    update();
}
 
void QLineEdit::focusOutEvent(QFocusEvent *e)
{
    Q_D(QLineEdit);
    if (d->control->passwordEchoEditing()) {
        // Reset the echomode back to PasswordEchoOnEdit when the widget loses
        // focus.
        d->updatePasswordEchoEditing(false);
    }
 
    Qt::FocusReason reason = e->reason();
    if (reason != Qt::ActiveWindowFocusReason &&
        reason != Qt::PopupFocusReason)
        deselect();
 
    d->setCursorVisible(false);
    d->control->setBlinkingCursorEnabled(false);
#ifdef QT_KEYPAD_NAVIGATION
    // editingFinished() is already emitted on LeaveEditFocus
    if (!QApplicationPrivate::keypadNavigationEnabled())
#endif
    if (reason != Qt::PopupFocusReason
        || !(QApplication::activePopupWidget() && QApplication::activePopupWidget()->parentWidget() == this)) {
            if (d->edited && (hasAcceptableInput() || d->control->fixup())) {
                emit editingFinished();
                d->edited = false;
            }
    }
#ifdef QT_KEYPAD_NAVIGATION
    d->control->setCancelText(QString());
#endif
#if QT_CONFIG(completer)
    if (d->control->completer())
        d->disconnectCompleter();
#endif
    QWidget::focusOutEvent(e);
}
 
void QLineEdit::paintEvent(QPaintEvent *)
{
    Q_D(QLineEdit);
    QPainter p(this);
    QPalette pal = palette();
 
    QStyleOptionFrame panel;
    initStyleOption(&panel);
    style()->drawPrimitive(QStyle::PE_PanelLineEdit, &panel, &p, this);
    QRect r = style()->subElementRect(QStyle::SE_LineEditContents, &panel, this);
    r = r.marginsRemoved(d->effectiveTextMargins());
    p.setClipRect(r);
 
    QFontMetrics fm = fontMetrics();
    int fmHeight = 0;
    if (d->shouldShowPlaceholderText())
        fmHeight = fm.boundingRect(d->placeholderText).height();
    else
        fmHeight = fm.boundingRect(d->control->text() + d->control->preeditAreaText()).height();
    fmHeight = qMax(fmHeight, fm.height());
 
    Qt::Alignment va = QStyle::visualAlignment(d->control->layoutDirection(), QFlag(d->alignment));
    switch (va & Qt::AlignVertical_Mask) {
     case Qt::AlignBottom:
         d->vscroll = r.y() + r.height() - fmHeight - QLineEditPrivate::verticalMargin;
         break;
     case Qt::AlignTop:
         d->vscroll = r.y() + QLineEditPrivate::verticalMargin;
         break;
     default:
         //center
         d->vscroll = r.y() + (r.height() - fmHeight + 1) / 2;
         break;
    }
    QRect lineRect(r.x() + QLineEditPrivate::horizontalMargin, d->vscroll,
                   r.width() - 2 * QLineEditPrivate::horizontalMargin, fmHeight);
 
    if (d->shouldShowPlaceholderText()) {
        if (!d->placeholderText.isEmpty()) {
            const Qt::LayoutDirection layoutDir = d->placeholderText.isRightToLeft() ? Qt::RightToLeft : Qt::LeftToRight;
            const Qt::Alignment alignPhText = QStyle::visualAlignment(layoutDir, QFlag(d->alignment));
            const QColor col = pal.placeholderText().color();
            QPen oldpen = p.pen();
            p.setPen(col);
            Qt::LayoutDirection oldLayoutDir = p.layoutDirection();
            p.setLayoutDirection(layoutDir);
 
            const QString elidedText = fm.elidedText(d->placeholderText, Qt::ElideRight, lineRect.width());
            p.drawText(lineRect, alignPhText, elidedText);
            p.setPen(oldpen);
            p.setLayoutDirection(oldLayoutDir);
        }
    }
 
    int cix = qRound(d->control->cursorToX());
 
    // horizontal scrolling. d->hscroll is the left indent from the beginning
    // of the text line to the left edge of lineRect. we update this value
    // depending on the delta from the last paint event; in effect this means
    // the below code handles all scrolling based on the textline (widthUsed),
    // the line edit rect (lineRect) and the cursor position (cix).
    int widthUsed = qRound(d->control->naturalTextWidth()) + 1;
    if (widthUsed <= lineRect.width()) {
        // text fits in lineRect; use hscroll for alignment
        switch (va & ~(Qt::AlignAbsolute|Qt::AlignVertical_Mask)) {
        case Qt::AlignRight:
            d->hscroll = widthUsed - lineRect.width() + 1;
            break;
        case Qt::AlignHCenter:
            d->hscroll = (widthUsed - lineRect.width()) / 2;
            break;
        default:
            // Left
            d->hscroll = 0;
            break;
        }
    } else if (cix - d->hscroll >= lineRect.width()) {
        // text doesn't fit, cursor is to the right of lineRect (scroll right)
        d->hscroll = cix - lineRect.width() + 1;
    } else if (cix - d->hscroll < 0 && d->hscroll < widthUsed) {
        // text doesn't fit, cursor is to the left of lineRect (scroll left)
        d->hscroll = cix;
    } else if (widthUsed - d->hscroll < lineRect.width()) {
        // text doesn't fit, text document is to the left of lineRect; align
        // right
        d->hscroll = widthUsed - lineRect.width() + 1;
    } else {
        //in case the text is bigger than the lineedit, the hscroll can never be negative
        d->hscroll = qMax(0, d->hscroll);
    }
 
    // the y offset is there to keep the baseline constant in case we have script changes in the text.
    // Needs to be kept in sync with QLineEditPrivate::adjustedControlRect
    QPoint topLeft = lineRect.topLeft() - QPoint(d->hscroll, d->control->ascent() - fm.ascent());
 
    // draw text, selections and cursors
#ifndef QT_NO_STYLE_STYLESHEET
    if (QStyleSheetStyle* cssStyle = qt_styleSheet(style())) {
        cssStyle->styleSheetPalette(this, &panel, &pal);
    }
#endif
    p.setPen(pal.text().color());
 
    int flags = QWidgetLineControl::DrawText;
 
#ifdef QT_KEYPAD_NAVIGATION
    if (!QApplicationPrivate::keypadNavigationEnabled() || hasEditFocus())
#endif
    if (d->control->hasSelectedText() || (d->cursorVisible && !d->control->inputMask().isEmpty() && !d->control->isReadOnly())){
        flags |= QWidgetLineControl::DrawSelections;
        // Palette only used for selections/mask and may not be in sync
        if (d->control->palette() != pal
           || d->control->palette().currentColorGroup() != pal.currentColorGroup())
            d->control->setPalette(pal);
    }
 
    // Asian users see an IM selection text as cursor on candidate
    // selection phase of input method, so the ordinary cursor should be
    // invisible if we have a preedit string. another condition is when inputmask
    // isn't empty,we don't need draw cursor,because cursor and character overlapping
    // area is white.
    if (d->cursorVisible && !d->control->isReadOnly() && d->control->inputMask().isEmpty())
        flags |= QWidgetLineControl::DrawCursor;
 
    d->control->setCursorWidth(style()->pixelMetric(QStyle::PM_TextCursorWidth, &panel, this));
    d->control->draw(&p, topLeft, r, flags);
 
}
 
 
#if QT_CONFIG(draganddrop)
void QLineEdit::dragMoveEvent(QDragMoveEvent *e)
{
    Q_D(QLineEdit);
    if (!d->control->isReadOnly() && e->mimeData()->hasFormat("text/plain"_L1)) {
        e->acceptProposedAction();
        d->control->moveCursor(d->xToPos(e->position().toPoint().x()), false);
        d->cursorVisible = true;
        update();
    }
}
 
void QLineEdit::dragEnterEvent(QDragEnterEvent * e)
{
    QLineEdit::dragMoveEvent(e);
}
 
void QLineEdit::dragLeaveEvent(QDragLeaveEvent *)
{
    Q_D(QLineEdit);
    if (d->cursorVisible) {
        d->cursorVisible = false;
        update();
    }
}
 
void QLineEdit::dropEvent(QDropEvent* e)
{
    Q_D(QLineEdit);
    QString str = e->mimeData()->text();
 
    if (!str.isNull() && !d->control->isReadOnly()) {
        if (e->source() == this && e->dropAction() == Qt::CopyAction)
            deselect();
        int cursorPos = d->xToPos(e->position().toPoint().x());
        int selStart = cursorPos;
        int oldSelStart = d->control->selectionStart();
        int oldSelEnd = d->control->selectionEnd();
        d->control->moveCursor(cursorPos, false);
        d->cursorVisible = false;
        e->acceptProposedAction();
        insert(str);
        if (e->source() == this) {
            if (e->dropAction() == Qt::MoveAction) {
                if (selStart > oldSelStart && selStart <= oldSelEnd)
                    setSelection(oldSelStart, str.size());
                else if (selStart > oldSelEnd)
                    setSelection(selStart - str.size(), str.size());
                else
                    setSelection(selStart, str.size());
            } else {
                setSelection(selStart, str.size());
            }
        }
    } else {
        e->ignore();
        update();
    }
}
 
#endif // QT_CONFIG(draganddrop)
 
#ifndef QT_NO_CONTEXTMENU
void QLineEdit::contextMenuEvent(QContextMenuEvent *event)
{
    if (QMenu *menu = createStandardContextMenu()) {
        menu->setAttribute(Qt::WA_DeleteOnClose);
        menu->popup(event->globalPos());
    }
}
 
QMenu *QLineEdit::createStandardContextMenu()
{
    Q_D(QLineEdit);
    QMenu *popup = new QMenu(this);
    popup->setObjectName("qt_edit_menu"_L1);
    QAction *action = nullptr;
 
    if (!isReadOnly()) {
        action = popup->addAction(QLineEdit::tr("&Undo") + ACCEL_KEY(QKeySequence::Undo));
        action->setEnabled(d->control->isUndoAvailable());
        action->setObjectName(QStringLiteral("edit-undo"));
        setActionIcon(action, QStringLiteral("edit-undo"));
        connect(action, &QAction::triggered, this, &QLineEdit::undo);
 
        action = popup->addAction(QLineEdit::tr("&Redo") + ACCEL_KEY(QKeySequence::Redo));
        action->setEnabled(d->control->isRedoAvailable());
        action->setObjectName(QStringLiteral("edit-redo"));
        setActionIcon(action, QStringLiteral("edit-redo"));
        connect(action, &QAction::triggered, this, &QLineEdit::redo);
 
        popup->addSeparator();
    }
 
#ifndef QT_NO_CLIPBOARD
    if (!isReadOnly()) {
        action = popup->addAction(QLineEdit::tr("Cu&t") + ACCEL_KEY(QKeySequence::Cut));
        action->setEnabled(!d->control->isReadOnly() && d->control->hasSelectedText()
                && d->control->echoMode() == QLineEdit::Normal);
        action->setObjectName(QStringLiteral("edit-cut"));
        setActionIcon(action, QStringLiteral("edit-cut"));
        connect(action, &QAction::triggered, this, &QLineEdit::cut);
    }
 
    action = popup->addAction(QLineEdit::tr("&Copy") + ACCEL_KEY(QKeySequence::Copy));
    action->setEnabled(d->control->hasSelectedText()
            && d->control->echoMode() == QLineEdit::Normal);
    action->setObjectName(QStringLiteral("edit-copy"));
    setActionIcon(action, QStringLiteral("edit-copy"));
    connect(action, &QAction::triggered, this, &QLineEdit::copy);
 
    if (!isReadOnly()) {
        action = popup->addAction(QLineEdit::tr("&Paste") + ACCEL_KEY(QKeySequence::Paste));
        action->setEnabled(!d->control->isReadOnly() && !QGuiApplication::clipboard()->text().isEmpty());
        action->setObjectName(QStringLiteral("edit-paste"));
        setActionIcon(action, QStringLiteral("edit-paste"));
        connect(action, &QAction::triggered, this, &QLineEdit::paste);
    }
#endif
 
    if (!isReadOnly()) {
        action = popup->addAction(QLineEdit::tr("Delete"));
        action->setEnabled(!d->control->isReadOnly() && !d->control->text().isEmpty() && d->control->hasSelectedText());
        action->setObjectName(QStringLiteral("edit-delete"));
        setActionIcon(action, QStringLiteral("edit-delete"));
        connect(action, &QAction::triggered,
                d->control, &QWidgetLineControl::_q_deleteSelected);
    }
 
    if (!popup->isEmpty())
        popup->addSeparator();
 
    action = popup->addAction(QLineEdit::tr("Select All") + ACCEL_KEY(QKeySequence::SelectAll));
    action->setEnabled(!d->control->text().isEmpty() && !d->control->allSelected());
    action->setObjectName(QStringLiteral("select-all"));
    setActionIcon(action, QStringLiteral("edit-select-all"));
    d->selectAllAction = action;
    connect(action, &QAction::triggered, this, &QLineEdit::selectAll);
 
    if (!d->control->isReadOnly() && QGuiApplication::styleHints()->useRtlExtensions()) {
        popup->addSeparator();
        QUnicodeControlCharacterMenu *ctrlCharacterMenu = new QUnicodeControlCharacterMenu(this, popup);
        popup->addMenu(ctrlCharacterMenu);
    }
    return popup;
}
#endif // QT_NO_CONTEXTMENU
 
void QLineEdit::changeEvent(QEvent *ev)
{
    Q_D(QLineEdit);
    switch(ev->type())
    {
    case QEvent::ActivationChange:
        if (!palette().isEqual(QPalette::Active, QPalette::Inactive))
            update();
        break;
    case QEvent::FontChange:
        d->control->setFont(font());
        break;
    case QEvent::StyleChange:
        {
            QStyleOptionFrame opt;
            initStyleOption(&opt);
            d->control->setPasswordCharacter(char16_t(style()->styleHint(QStyle::SH_LineEdit_PasswordCharacter, &opt, this)));
            d->control->setPasswordMaskDelay(style()->styleHint(QStyle::SH_LineEdit_PasswordMaskDelay, &opt, this));
        }
        update();
        break;
    case QEvent::LayoutDirectionChange:
#if QT_CONFIG(toolbutton)
        for (const auto &e : d->trailingSideWidgets) { // Refresh icon to show arrow in right direction.
            if (e.flags & QLineEditPrivate::SideWidgetClearButton)
                static_cast<QLineEditIconButton *>(e.widget)->setIcon(d->clearButtonIcon());
        }
#endif
        d->positionSideWidgets();
        break;
    default:
        break;
    }
    QWidget::changeEvent(ev);
}
 
QT_END_NAMESPACE
 
#include "moc_qlineedit.cpp"