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/****************************************************************************
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**
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** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the Qt Designer of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** No Commercial Usage
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** This file contains pre-release code and may not be distributed.
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** You may use this file in accordance with the terms and conditions
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** contained in the Technology Preview License Agreement accompanying
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** this package.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights. These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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**
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**
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**
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**
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**
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**
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "spacer_widget_p.h"
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#include "layoutinfo_p.h"
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#include <QtDesigner/abstractformwindow.h>
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#include <QtDesigner/QDesignerFormWindowInterface>
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#include <QtDesigner/QDesignerFormEditorInterface>
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#include <QtDesigner/QDesignerPropertySheetExtension>
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#include <QtDesigner/QExtensionManager>
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#include <QtGui/QLayout>
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#include <QtGui/QPainter>
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#include <QtGui/qevent.h>
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#include <QtCore/qdebug.h>
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QT_BEGIN_NAMESPACE
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// The Spacer widget is Designer representation of QLayoutItem.
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// It uses QLayoutItem's sizeHint property as QWidget
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// sizeHint and the QLayoutItem's sizeType property as QWidget size policy.
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// If it is not within a layout, it adds a margin (m_SizeOffset) around it
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// to avoid being shrunk to an invisible state when the sizeHint is reset to 0,0
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// and enables sizeHandle-resizing. In a layout, however, this m_SizeOffset
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// should not be applied for pixel-exact design.
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Spacer::Spacer(QWidget *parent) :
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QWidget(parent),
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m_SizeOffset(3, 3), // A small offset to ensure the spacer is still visible when reset to size 0,0
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m_orientation(Qt::Vertical),
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m_interactive(true),
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m_layoutState(UnknownLayoutState),
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m_sizeHint(0, 0)
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{
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setAttribute(Qt::WA_MouseNoMask);
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m_formWindow = QDesignerFormWindowInterface::findFormWindow(this);
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setSizeType(QSizePolicy::Expanding);
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}
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bool Spacer::event(QEvent *e)
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{
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switch (e->type()) {
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case QEvent::ToolTip:
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updateToolTip(); // Tooltip includes size, so, refresh on demand
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break;
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case QEvent::ParentChange: // Cache information about 'being in layout' which is expensive to calculate.
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m_layoutState = UnknownLayoutState;
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break;
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default:
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break;
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}
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return QWidget::event(e);
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}
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bool Spacer::isInLayout() const
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{
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if (m_layoutState == UnknownLayoutState) {
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m_layoutState = OutsideLayout;
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if (m_formWindow)
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if (const QWidget *parent = parentWidget())
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if (qdesigner_internal::LayoutInfo::managedLayoutType(m_formWindow->core(), parent) != qdesigner_internal::LayoutInfo::NoLayout)
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m_layoutState = InLayout;
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}
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return m_layoutState == InLayout;
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}
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void Spacer::paintEvent(QPaintEvent *)
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{
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// Only draw spacers when we're editting widgets
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if (m_formWindow != 0 && m_formWindow->currentTool() != 0)
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return;
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QPainter p(this);
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p.setPen(Qt::blue);
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const int w = width();
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const int h = height();
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if (w * h == 0)
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return;
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if (w <= m_SizeOffset.width() || h <= m_SizeOffset.height()) {
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const int lw = w - 1;
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const int lh = h - 1;
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switch (m_orientation) {
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case Qt::Horizontal:
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p.drawLine(0, 0, 0, lh);
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p.drawLine(lw, 0, lw, lh);
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break;
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case Qt::Vertical:
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p.drawLine(0, 0, lw, 0);
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p.drawLine(0, lh, lw, lh);
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break;
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}
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return;
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}
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if (m_orientation == Qt::Horizontal) {
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const int dist = 3;
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const int amplitude = qMin(3, h / 3);
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const int base = h / 2;
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int i = 0;
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p.setPen(Qt::white);
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for (i = 0; i < w / 3 +2; ++i)
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p.drawLine(i * dist, base - amplitude, i * dist + dist / 2, base + amplitude);
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p.setPen(Qt::blue);
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for (i = 0; i < w / 3 +2; ++i)
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p.drawLine(i * dist + dist / 2, base + amplitude, i * dist + dist, base - amplitude);
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const int y = h/2;
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p.drawLine(0, y-10, 0, y+10);
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p.drawLine(w - 1, y-10, w - 1, y+10);
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} else {
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const int dist = 3;
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const int amplitude = qMin(3, w / 3);
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const int base = w / 2;
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int i = 0;
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p.setPen(Qt::white);
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for (i = 0; i < h / 3 +2; ++i)
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p.drawLine(base - amplitude, i * dist, base + amplitude,i * dist + dist / 2);
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p.setPen(Qt::blue);
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for (i = 0; i < h / 3 +2; ++i)
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p.drawLine(base + amplitude, i * dist + dist / 2, base - amplitude, i * dist + dist);
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const int x = w/2;
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p.drawLine(x-10, 0, x+10, 0);
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p.drawLine(x-10, h - 1, x+10, h - 1);
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}
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}
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void Spacer::resizeEvent(QResizeEvent* e)
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{
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QWidget::resizeEvent(e);
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// When resized by widget handle dragging after a reset (QSize(0, 0)):
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// Mark the property as changed (geometry and sizeHint are in sync except for 'changed').
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if (m_formWindow) {
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const QSize oldSize = e->oldSize();
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if (oldSize.isNull() || oldSize.width() <= m_SizeOffset.width() || oldSize.height() <= m_SizeOffset.height())
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if (QDesignerPropertySheetExtension *sheet = qt_extension<QDesignerPropertySheetExtension*>(m_formWindow->core()->extensionManager(), this))
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sheet->setChanged(sheet->indexOf(QLatin1String("sizeHint")), true);
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}
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updateMask();
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if (!m_interactive)
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return;
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if (!isInLayout()) { // Allow size-handle resize only if not in layout
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const QSize currentSize = size();
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if (currentSize.width() >= m_SizeOffset.width() && currentSize.height() >= m_SizeOffset.height())
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m_sizeHint = currentSize - m_SizeOffset;
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}
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}
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void Spacer::updateMask()
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{
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QRegion r(rect());
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const int w = width();
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const int h = height();
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if (w > 1 && h > 1) {
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if (m_orientation == Qt::Horizontal) {
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const int amplitude = qMin(3, h / 3);
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const int base = h / 2;
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r = r.subtract(QRect(1, 0, w - 2, base - amplitude));
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r = r.subtract(QRect(1, base + amplitude, w - 2, h - base - amplitude));
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} else {
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const int amplitude = qMin(3, w / 3);
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const int base = w / 2;
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r = r.subtract(QRect(0, 1, base - amplitude, h - 2));
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r = r.subtract(QRect(base + amplitude, 1, w - base - amplitude, h - 2));
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}
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}
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setMask(r);
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}
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void Spacer::setSizeType(QSizePolicy::Policy t)
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{
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const QSizePolicy sizeP = m_orientation == Qt::Vertical ? QSizePolicy(QSizePolicy::Minimum, t) : QSizePolicy(t, QSizePolicy::Minimum);
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setSizePolicy(sizeP);
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}
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QSizePolicy::Policy Spacer::sizeType() const
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{
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return m_orientation == Qt::Vertical ? sizePolicy().verticalPolicy() : sizePolicy().horizontalPolicy();
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}
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Qt::Alignment Spacer::alignment() const
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{
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// For grid layouts
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return m_orientation == Qt::Vertical ? Qt::AlignHCenter : Qt::AlignVCenter;
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}
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QSize Spacer::sizeHint() const
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{
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return isInLayout() ? m_sizeHint : m_sizeHint + m_SizeOffset;
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}
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QSize Spacer::sizeHintProperty() const
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{
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return m_sizeHint;
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}
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void Spacer::setSizeHintProperty(const QSize &s)
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{
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m_sizeHint = s;
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if (!isInLayout()) // Visible resize only if not in layout
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resize(s + m_SizeOffset);
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updateGeometry();
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}
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Qt::Orientation Spacer::orientation() const
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{
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return m_orientation;
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}
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void Spacer::setOrientation(Qt::Orientation o)
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{
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if (m_orientation == o)
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return;
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const QSizePolicy::Policy st = sizeType(); // flip size type
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m_orientation = o;
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setSizeType(st);
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if (m_interactive) {
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m_sizeHint = QSize(m_sizeHint.height(), m_sizeHint.width());
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if (!isInLayout())
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resize(m_sizeHint + m_SizeOffset);
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}
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updateMask();
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update();
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updateGeometry();
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}
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void Spacer::updateToolTip()
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{
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const QString format = m_orientation == Qt::Horizontal ? tr("Horizontal Spacer '%1', %2 x %3") : tr("Vertical Spacer '%1', %2 x %3");
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QString msg = format.arg(objectName()).arg(m_sizeHint.width()).arg(m_sizeHint.height());
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setToolTip(msg);
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}
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QT_END_NAMESPACE
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