qquicktextutil_p.h

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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
 
#ifndef QQUICKTEXTUTIL_P_H
#define QQUICKTEXTUTIL_P_H
 
//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
 
#include <QtQml/qqml.h>
#include <QtQml/qqmlincubator.h>
#include <QtQuick/qquickitem.h>
#include <QtQuick/qquickwindow.h>
#include <QtCore/private/qglobal_p.h>
 
QT_BEGIN_NAMESPACE
 
class QQuickTextUtil : public QObject   // For the benefit of translations.
{
    Q_OBJECT
public:
    template <typename Private> static void setCursorDelegate(Private *d, QQmlComponent *delegate);
    template <typename Private> static void createCursor(Private *d);
 
    template <typename T> static typename T::RenderType textRenderType();
 
    static qreal alignedX(qreal textWidth, qreal itemWidth, int alignment);
    static qreal alignedY(qreal textHeight, qreal itemHeight, int alignment);
 
private:
    static QQuickItem *createCursor(
            QQmlComponent *component,
            QQuickItem *parent,
            const QRectF &cursorRectangle,
            const char *className);
 
};
 
template <typename Private>
void QQuickTextUtil::setCursorDelegate(Private *d, QQmlComponent *delegate)
{
    if (d->cursorComponent == delegate)
        return;
 
    typename Private::Public *parent = d->q_func();
 
    if (d->cursorComponent) {
        disconnect(d->cursorComponent, SIGNAL(statusChanged(QQmlComponent::Status)),
                parent, SLOT(createCursor()));
    }
 
    delete d->cursorItem;
    d->cursorItem = 0;
    d->cursorPending = true;
 
    d->cursorComponent = delegate;
 
    if (parent->isCursorVisible() && parent->isComponentComplete())
        createCursor(d);
 
    Q_EMIT parent->cursorDelegateChanged();
}
 
template <typename Private>
void QQuickTextUtil::createCursor(Private *d)
{
    if (!d->cursorPending)
        return;
 
    d->cursorPending = false;
 
    typename Private::Public *parent = d->q_func();
    if (d->cursorComponent) {
        d->cursorItem = createCursor(
                d->cursorComponent,
                parent,
                parent->cursorRectangle(),
                Private::Public::staticMetaObject.className());
    }
 
    d->setNativeCursorEnabled(!d->cursorItem);
    d->updateType = Private::UpdatePaintNode;
    parent->update();
}
 
template <typename T>
typename T::RenderType QQuickTextUtil::textRenderType()
{
    switch (QQuickWindow::textRenderType()) {
    case QQuickWindow::QtTextRendering:
        return T::QtRendering;
    case QQuickWindow::NativeTextRendering:
        return T::NativeRendering;
    case QQuickWindow::CurveTextRendering:
        return T::CurveRendering;
    }
 
    Q_UNREACHABLE_RETURN(T::QtRendering);
}
 
QT_END_NAMESPACE
 
#endif