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/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qsizegrip.h"
#ifndef QT_NO_SIZEGRIP
#include "qapplication.h"
#include "qevent.h"
#include "qpainter.h"
#include "qstyle.h"
#include "qstyleoption.h"
#include "qlayout.h"
#include "qdebug.h"
#include <QDesktopWidget>
#if defined(Q_WS_X11)
#include <private/qt_x11_p.h>
#elif defined (Q_WS_WIN)
#include "qt_windows.h"
#endif
#ifdef Q_WS_MAC
#include <private/qt_mac_p.h>
#endif
#include <private/qwidget_p.h>
#include <QtGui/qabstractscrollarea.h>
#define SZ_SIZEBOTTOMRIGHT 0xf008
#define SZ_SIZEBOTTOMLEFT 0xf007
#define SZ_SIZETOPLEFT 0xf004
#define SZ_SIZETOPRIGHT 0xf005
QT_BEGIN_NAMESPACE
static QWidget *qt_sizegrip_topLevelWidget(QWidget* w)
{
while (w && !w->isWindow() && w->windowType() != Qt::SubWindow)
w = w->parentWidget();
return w;
}
class QSizeGripPrivate : public QWidgetPrivate
{
Q_DECLARE_PUBLIC(QSizeGrip)
public:
void init();
QPoint p;
QRect r;
int d;
int dxMax;
int dyMax;
Qt::Corner m_corner;
bool gotMousePress;
QWidget *tlw;
#ifdef Q_WS_MAC
void updateMacSizer(bool hide) const;
#endif
Qt::Corner corner() const;
inline bool atBottom() const
{
return m_corner == Qt::BottomRightCorner || m_corner == Qt::BottomLeftCorner;
}
inline bool atLeft() const
{
return m_corner == Qt::BottomLeftCorner || m_corner == Qt::TopLeftCorner;
}
void updateTopLevelWidget()
{
Q_Q(QSizeGrip);
QWidget *w = qt_sizegrip_topLevelWidget(q);
if (tlw == w)
return;
if (tlw)
tlw->removeEventFilter(q);
tlw = w;
if (tlw)
tlw->installEventFilter(q);
}
// This slot is invoked by QLayout when the size grip is added to
// a layout or reparented after the tlw is shown. This re-implementation is basically
// the same as QWidgetPrivate::_q_showIfNotHidden except that it checks
// for Qt::WindowFullScreen and Qt::WindowMaximized as well.
void _q_showIfNotHidden()
{
Q_Q(QSizeGrip);
bool showSizeGrip = !(q->isHidden() && q->testAttribute(Qt::WA_WState_ExplicitShowHide));
updateTopLevelWidget();
if (tlw && showSizeGrip) {
Qt::WindowStates sizeGripNotVisibleState = Qt::WindowFullScreen;
#ifndef Q_WS_MAC
sizeGripNotVisibleState |= Qt::WindowMaximized;
#endif
// Don't show the size grip if the tlw is maximized or in full screen mode.
showSizeGrip = !(tlw->windowState() & sizeGripNotVisibleState);
}
if (showSizeGrip)
q->setVisible(true);
}
};
#ifdef Q_WS_MAC
void QSizeGripPrivate::updateMacSizer(bool hide) const
{
Q_Q(const QSizeGrip);
if (QApplication::closingDown() || !parent)
return;
QWidget *topLevelWindow = qt_sizegrip_topLevelWidget(const_cast<QSizeGrip *>(q));
if(topLevelWindow && topLevelWindow->isWindow())
QWidgetPrivate::qt_mac_update_sizer(topLevelWindow, hide ? -1 : 1);
}
#endif
Qt::Corner QSizeGripPrivate::corner() const
{
Q_Q(const QSizeGrip);
QWidget *tlw = qt_sizegrip_topLevelWidget(const_cast<QSizeGrip *>(q));
const QPoint sizeGripPos = q->mapTo(tlw, QPoint(0, 0));
bool isAtBottom = sizeGripPos.y() >= tlw->height() / 2;
bool isAtLeft = sizeGripPos.x() <= tlw->width() / 2;
if (isAtLeft)
return isAtBottom ? Qt::BottomLeftCorner : Qt::TopLeftCorner;
else
return isAtBottom ? Qt::BottomRightCorner : Qt::TopRightCorner;
}
/*!
\class QSizeGrip
\brief The QSizeGrip class provides a resize handle for resizing top-level windows.
\ingroup mainwindow-classes
\ingroup basicwidgets
This widget works like the standard Windows resize handle. In the
X11 version this resize handle generally works differently from
the one provided by the system if the X11 window manager does not
support necessary modern post-ICCCM specifications.
Put this widget anywhere in a widget tree and the user can use it
to resize the top-level window or any widget with the Qt::SubWindow
flag set. Generally, this should be in the lower right-hand corner.
Note that QStatusBar already uses this widget, so if you have a
status bar (e.g., you are using QMainWindow), then you don't need
to use this widget explicitly.
On some platforms the size grip automatically hides itself when the
window is shown full screen or maximised.
\table 50%
\row \o \inlineimage plastique-sizegrip.png Screenshot of a Plastique style size grip
\o A size grip widget at the bottom-right corner of a main window, shown in the
\l{Plastique Style Widget Gallery}{Plastique widget style}.
\endtable
The QSizeGrip class inherits QWidget and reimplements the \l
{QWidget::mousePressEvent()}{mousePressEvent()} and \l
{QWidget::mouseMoveEvent()}{mouseMoveEvent()} functions to feature
the resize functionality, and the \l
{QWidget::paintEvent()}{paintEvent()} function to render the
size grip widget.
\sa QStatusBar QWidget::windowState()
*/
/*!
Constructs a resize corner as a child widget of the given \a
parent.
*/
QSizeGrip::QSizeGrip(QWidget * parent)
: QWidget(*new QSizeGripPrivate, parent, 0)
{
Q_D(QSizeGrip);
d->init();
}
#ifdef QT3_SUPPORT
/*!
\obsolete
Constructs a resize corner with the given \a name, as a child
widget of the given \a parent.
*/
QSizeGrip::QSizeGrip(QWidget * parent, const char* name)
: QWidget(*new QSizeGripPrivate, parent, 0)
{
Q_D(QSizeGrip);
setObjectName(QString::fromAscii(name));
d->init();
}
#endif
void QSizeGripPrivate::init()
{
Q_Q(QSizeGrip);
dxMax = 0;
dyMax = 0;
tlw = 0;
m_corner = q->isLeftToRight() ? Qt::BottomRightCorner : Qt::BottomLeftCorner;
gotMousePress = false;
#if !defined(QT_NO_CURSOR) && !defined(Q_WS_MAC)
q->setCursor(m_corner == Qt::TopLeftCorner || m_corner == Qt::BottomRightCorner
? Qt::SizeFDiagCursor : Qt::SizeBDiagCursor);
#endif
q->setSizePolicy(QSizePolicy(QSizePolicy::Minimum, QSizePolicy::Fixed));
updateTopLevelWidget();
}
/*!
Destroys this size grip.
*/
QSizeGrip::~QSizeGrip()
{
}
/*!
\reimp
*/
QSize QSizeGrip::sizeHint() const
{
QStyleOption opt(0);
opt.init(this);
return (style()->sizeFromContents(QStyle::CT_SizeGrip, &opt, QSize(13, 13), this).
expandedTo(QApplication::globalStrut()));
}
/*!
Paints the resize grip.
Resize grips are usually rendered as small diagonal textured lines
in the lower-right corner. The paint event is passed in the \a
event parameter.
*/
void QSizeGrip::paintEvent(QPaintEvent *event)
{
Q_UNUSED(event);
Q_D(QSizeGrip);
QPainter painter(this);
QStyleOptionSizeGrip opt;
opt.init(this);
opt.corner = d->m_corner;
style()->drawControl(QStyle::CE_SizeGrip, &opt, &painter, this);
}
/*!
\fn void QSizeGrip::mousePressEvent(QMouseEvent * event)
Receives the mouse press events for the widget, and primes the
resize operation. The mouse press event is passed in the \a event
parameter.
*/
void QSizeGrip::mousePressEvent(QMouseEvent * e)
{
if (e->button() != Qt::LeftButton) {
QWidget::mousePressEvent(e);
return;
}
Q_D(QSizeGrip);
QWidget *tlw = qt_sizegrip_topLevelWidget(this);
d->p = e->globalPos();
d->gotMousePress = true;
d->r = tlw->geometry();
#ifdef Q_WS_X11
// Use a native X11 sizegrip for "real" top-level windows if supported.
if (tlw->isWindow() && X11->isSupportedByWM(ATOM(_NET_WM_MOVERESIZE))
&& !tlw->testAttribute(Qt::WA_DontShowOnScreen) && !qt_widget_private(tlw)->hasHeightForWidth()) {
XEvent xev;
xev.xclient.type = ClientMessage;
xev.xclient.message_type = ATOM(_NET_WM_MOVERESIZE);
xev.xclient.display = X11->display;
xev.xclient.window = tlw->winId();
xev.xclient.format = 32;
xev.xclient.data.l[0] = e->globalPos().x();
xev.xclient.data.l[1] = e->globalPos().y();
if (d->atBottom())
xev.xclient.data.l[2] = d->atLeft() ? 6 : 4; // bottomleft/bottomright
else
xev.xclient.data.l[2] = d->atLeft() ? 0 : 2; // topleft/topright
xev.xclient.data.l[3] = Button1;
xev.xclient.data.l[4] = 0;
XUngrabPointer(X11->display, X11->time);
XSendEvent(X11->display, QX11Info::appRootWindow(x11Info().screen()), False,
SubstructureRedirectMask | SubstructureNotifyMask, &xev);
return;
}
#endif // Q_WS_X11
#ifdef Q_WS_WIN
if (tlw->isWindow() && !tlw->testAttribute(Qt::WA_DontShowOnScreen) && !qt_widget_private(tlw)->hasHeightForWidth()) {
uint orientation = 0;
if (d->atBottom())
orientation = d->atLeft() ? SZ_SIZEBOTTOMLEFT : SZ_SIZEBOTTOMRIGHT;
else
orientation = d->atLeft() ? SZ_SIZETOPLEFT : SZ_SIZETOPRIGHT;
ReleaseCapture();
PostMessage(tlw->winId(), WM_SYSCOMMAND, orientation, 0);
return;
}
#endif // Q_WS_WIN
// Find available desktop/workspace geometry.
QRect availableGeometry;
bool hasVerticalSizeConstraint = true;
bool hasHorizontalSizeConstraint = true;
if (tlw->isWindow())
availableGeometry = QApplication::desktop()->availableGeometry(tlw);
else {
const QWidget *tlwParent = tlw->parentWidget();
// Check if tlw is inside QAbstractScrollArea/QScrollArea.
// If that's the case tlw->parentWidget() will return the viewport
// and tlw->parentWidget()->parentWidget() will return the scroll area.
#ifndef QT_NO_SCROLLAREA
QAbstractScrollArea *scrollArea = qobject_cast<QAbstractScrollArea *>(tlwParent->parentWidget());
if (scrollArea) {
hasHorizontalSizeConstraint = scrollArea->horizontalScrollBarPolicy() == Qt::ScrollBarAlwaysOff;
hasVerticalSizeConstraint = scrollArea->verticalScrollBarPolicy() == Qt::ScrollBarAlwaysOff;
}
#endif // QT_NO_SCROLLAREA
availableGeometry = tlwParent->contentsRect();
}
// Find frame geometries, title bar height, and decoration sizes.
const QRect frameGeometry = tlw->frameGeometry();
const int titleBarHeight = qMax(tlw->geometry().y() - frameGeometry.y(), 0);
const int bottomDecoration = qMax(frameGeometry.height() - tlw->height() - titleBarHeight, 0);
const int leftRightDecoration = qMax((frameGeometry.width() - tlw->width()) / 2, 0);
// Determine dyMax depending on whether the sizegrip is at the bottom
// of the widget or not.
if (d->atBottom()) {
if (hasVerticalSizeConstraint)
d->dyMax = availableGeometry.bottom() - d->r.bottom() - bottomDecoration;
else
d->dyMax = INT_MAX;
} else {
if (hasVerticalSizeConstraint)
d->dyMax = availableGeometry.y() - d->r.y() + titleBarHeight;
else
d->dyMax = -INT_MAX;
}
// In RTL mode, the size grip is to the left; find dxMax from the desktop/workspace
// geometry, the size grip geometry and the width of the decoration.
if (d->atLeft()) {
if (hasHorizontalSizeConstraint)
d->dxMax = availableGeometry.x() - d->r.x() + leftRightDecoration;
else
d->dxMax = -INT_MAX;
} else {
if (hasHorizontalSizeConstraint)
d->dxMax = availableGeometry.right() - d->r.right() - leftRightDecoration;
else
d->dxMax = INT_MAX;
}
}
/*!
\fn void QSizeGrip::mouseMoveEvent(QMouseEvent * event)
Resizes the top-level widget containing this widget. The mouse
move event is passed in the \a event parameter.
*/
void QSizeGrip::mouseMoveEvent(QMouseEvent * e)
{
if (e->buttons() != Qt::LeftButton) {
QWidget::mouseMoveEvent(e);
return;
}
Q_D(QSizeGrip);
QWidget* tlw = qt_sizegrip_topLevelWidget(this);
if (!d->gotMousePress || tlw->testAttribute(Qt::WA_WState_ConfigPending))
return;
#ifdef Q_WS_X11
if (tlw->isWindow() && X11->isSupportedByWM(ATOM(_NET_WM_MOVERESIZE))
&& tlw->isTopLevel() && !tlw->testAttribute(Qt::WA_DontShowOnScreen) && !qt_widget_private(tlw)->hasHeightForWidth())
return;
#endif
#ifdef Q_WS_WIN
if (tlw->isWindow() && GetSystemMenu(tlw->winId(), FALSE) != 0 && internalWinId()
&& !tlw->testAttribute(Qt::WA_DontShowOnScreen) && !qt_widget_private(tlw)->hasHeightForWidth()) {
MSG msg;
while(PeekMessage(&msg, winId(), WM_MOUSEMOVE, WM_MOUSEMOVE, PM_REMOVE));
return;
}
#endif
QPoint np(e->globalPos());
// Don't extend beyond the available geometry; bound to dyMax and dxMax.
QSize ns;
if (d->atBottom())
ns.rheight() = d->r.height() + qMin(np.y() - d->p.y(), d->dyMax);
else
ns.rheight() = d->r.height() - qMax(np.y() - d->p.y(), d->dyMax);
if (d->atLeft())
ns.rwidth() = d->r.width() - qMax(np.x() - d->p.x(), d->dxMax);
else
ns.rwidth() = d->r.width() + qMin(np.x() - d->p.x(), d->dxMax);
ns = QLayout::closestAcceptableSize(tlw, ns);
QPoint p;
QRect nr(p, ns);
if (d->atBottom()) {
if (d->atLeft())
nr.moveTopRight(d->r.topRight());
else
nr.moveTopLeft(d->r.topLeft());
} else {
if (d->atLeft())
nr.moveBottomRight(d->r.bottomRight());
else
nr.moveBottomLeft(d->r.bottomLeft());
}
tlw->setGeometry(nr);
}
/*!
\reimp
*/
void QSizeGrip::mouseReleaseEvent(QMouseEvent *mouseEvent)
{
if (mouseEvent->button() == Qt::LeftButton) {
Q_D(QSizeGrip);
d->gotMousePress = false;
d->p = QPoint();
} else {
QWidget::mouseReleaseEvent(mouseEvent);
}
}
/*!
\reimp
*/
void QSizeGrip::moveEvent(QMoveEvent * /*moveEvent*/)
{
Q_D(QSizeGrip);
// We're inside a resize operation; no update necessary.
if (!d->p.isNull())
return;
d->m_corner = d->corner();
#if !defined(QT_NO_CURSOR) && !defined(Q_WS_MAC)
setCursor(d->m_corner == Qt::TopLeftCorner || d->m_corner == Qt::BottomRightCorner
? Qt::SizeFDiagCursor : Qt::SizeBDiagCursor);
#endif
}
/*!
\reimp
*/
void QSizeGrip::showEvent(QShowEvent *showEvent)
{
#ifdef Q_WS_MAC
d_func()->updateMacSizer(false);
#endif
QWidget::showEvent(showEvent);
}
/*!
\reimp
*/
void QSizeGrip::hideEvent(QHideEvent *hideEvent)
{
#ifdef Q_WS_MAC
d_func()->updateMacSizer(true);
#endif
QWidget::hideEvent(hideEvent);
}
/*!
\reimp
*/
void QSizeGrip::setVisible(bool visible)
{
QWidget::setVisible(visible);
}
/*! \reimp */
bool QSizeGrip::eventFilter(QObject *o, QEvent *e)
{
Q_D(QSizeGrip);
if ((isHidden() && testAttribute(Qt::WA_WState_ExplicitShowHide))
|| e->type() != QEvent::WindowStateChange
|| o != d->tlw) {
return QWidget::eventFilter(o, e);
}
Qt::WindowStates sizeGripNotVisibleState = Qt::WindowFullScreen;
#ifndef Q_WS_MAC
sizeGripNotVisibleState |= Qt::WindowMaximized;
#endif
// Don't show the size grip if the tlw is maximized or in full screen mode.
setVisible(!(d->tlw->windowState() & sizeGripNotVisibleState));
setAttribute(Qt::WA_WState_ExplicitShowHide, false);
return QWidget::eventFilter(o, e);
}
/*!
\reimp
*/
bool QSizeGrip::event(QEvent *event)
{
return QWidget::event(event);
}
#ifdef Q_WS_WIN
/*! \reimp */
bool QSizeGrip::winEvent( MSG *m, long *result )
{
return QWidget::winEvent(m, result);
}
#endif
QT_END_NAMESPACE
#include "moc_qsizegrip.cpp"
#endif //QT_NO_SIZEGRIP
|