qcolumnviewgrip.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 "qcolumnviewgrip_p.h"
#include <qstyleoption.h>
#include <qpainter.h>
#include <qbrush.h>
#include <qevent.h>
#include <qdebug.h>
 
QT_BEGIN_NAMESPACE
 
/*
    \internal
    class QColumnViewGrip
 
    QColumnViewGrip is created to go inside QAbstractScrollArea's corner.
    When the mouse it moved it will resize the scroll area and emit's a signal.
 */
 
/*
    \internal
    \fn void QColumnViewGrip::gripMoved()
    Signal that is emitted when the grip moves the parent widget.
 */
 
QColumnViewGrip::QColumnViewGrip(QWidget *parent)
    :  QWidget(*new QColumnViewGripPrivate, parent, { })
{
#ifndef QT_NO_CURSOR
    setCursor(Qt::SplitHCursor);
#endif
}
 
QColumnViewGrip::QColumnViewGrip(QColumnViewGripPrivate & dd, QWidget *parent, Qt::WindowFlags f)
:  QWidget(dd, parent, f)
{
}
 
QColumnViewGrip::~QColumnViewGrip()
{
}
 
int QColumnViewGrip::moveGrip(int offset)
{
    QWidget *parentWidget = (QWidget*)parent();
 
    // first resize the parent
    int oldWidth = parentWidget->width();
    int newWidth = oldWidth;
    if (isRightToLeft())
       newWidth -= offset;
    else
       newWidth += offset;
    newWidth = qMax(parentWidget->minimumWidth(), newWidth);
    parentWidget->resize(newWidth, parentWidget->height());
 
    // Then have the view move the widget
    int realOffset = parentWidget->width() - oldWidth;
    int oldX = parentWidget->x();
    if (realOffset != 0)
        emit gripMoved(realOffset);
    if (isRightToLeft())
        realOffset = -1 * (oldX - parentWidget->x());
    return realOffset;
}
 
void QColumnViewGrip::paintEvent(QPaintEvent *event)
{
    QPainter painter(this);
    QStyleOption opt;
    opt.initFrom(this);
    style()->drawControl(QStyle::CE_ColumnViewGrip, &opt, &painter, this);
    event->accept();
}
 
void QColumnViewGrip::mouseDoubleClickEvent(QMouseEvent *event)
{
    Q_UNUSED(event);
    QWidget *parentWidget = (QWidget*)parent();
    int offset = parentWidget->sizeHint().width() - parentWidget->width();
    if (isRightToLeft())
        offset *= -1;
    moveGrip(offset);
    event->accept();
}
 
void QColumnViewGrip::mousePressEvent(QMouseEvent *event)
{
    Q_D(QColumnViewGrip);
    d->originalXLocation = event->globalPosition().toPoint().x();
    event->accept();
}
 
void QColumnViewGrip::mouseMoveEvent(QMouseEvent *event)
{
    Q_D(QColumnViewGrip);
    int offset = event->globalPosition().toPoint().x() - d->originalXLocation;
    d->originalXLocation = moveGrip(offset) + d->originalXLocation;
    event->accept();
}
 
void QColumnViewGrip::mouseReleaseEvent(QMouseEvent *event)
{
    Q_D(QColumnViewGrip);
    d->originalXLocation = -1;
    event->accept();
}
 
/*
 * private object implementation
 */
QColumnViewGripPrivate::QColumnViewGripPrivate()
:  QWidgetPrivate(),
originalXLocation(-1)
{
}
 
QT_END_NAMESPACE
 
#include "moc_qcolumnviewgrip_p.cpp"