/**************************************************************************** ** ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). ** All rights reserved. ** Contact: Nokia Corporation (qt-info@nokia.com) ** ** This file is part of the Qt Designer 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 "spacer_widget_p.h" #include "layoutinfo_p.h" #include #include #include #include #include #include #include #include #include QT_BEGIN_NAMESPACE // The Spacer widget is Designer representation of QLayoutItem. // It uses QLayoutItem's sizeHint property as QWidget // sizeHint and the QLayoutItem's sizeType property as QWidget size policy. // If it is not within a layout, it adds a margin (m_SizeOffset) around it // to avoid being shrunk to an invisible state when the sizeHint is reset to 0,0 // and enables sizeHandle-resizing. In a layout, however, this m_SizeOffset // should not be applied for pixel-exact design. Spacer::Spacer(QWidget *parent) : QWidget(parent), m_SizeOffset(3, 3), // A small offset to ensure the spacer is still visible when reset to size 0,0 m_orientation(Qt::Vertical), m_interactive(true), m_layoutState(UnknownLayoutState), m_sizeHint(0, 0) { setAttribute(Qt::WA_MouseNoMask); m_formWindow = QDesignerFormWindowInterface::findFormWindow(this); setSizeType(QSizePolicy::Expanding); } bool Spacer::event(QEvent *e) { switch (e->type()) { case QEvent::ToolTip: updateToolTip(); // Tooltip includes size, so, refresh on demand break; case QEvent::ParentChange: // Cache information about 'being in layout' which is expensive to calculate. m_layoutState = UnknownLayoutState; break; default: break; } return QWidget::event(e); } bool Spacer::isInLayout() const { if (m_layoutState == UnknownLayoutState) { m_layoutState = OutsideLayout; if (m_formWindow) if (const QWidget *parent = parentWidget()) if (qdesigner_internal::LayoutInfo::managedLayoutType(m_formWindow->core(), parent) != qdesigner_internal::LayoutInfo::NoLayout) m_layoutState = InLayout; } return m_layoutState == InLayout; } void Spacer::paintEvent(QPaintEvent *) { // Only draw spacers when we're editting widgets if (m_formWindow != 0 && m_formWindow->currentTool() != 0) return; QPainter p(this); p.setPen(Qt::blue); const int w = width(); const int h = height(); if (w * h == 0) return; if (w <= m_SizeOffset.width() || h <= m_SizeOffset.height()) { const int lw = w - 1; const int lh = h - 1; switch (m_orientation) { case Qt::Horizontal: p.drawLine(0, 0, 0, lh); p.drawLine(lw, 0, lw, lh); break; case Qt::Vertical: p.drawLine(0, 0, lw, 0); p.drawLine(0, lh, lw, lh); break; } return; } if (m_orientation == Qt::Horizontal) { const int dist = 3; const int amplitude = qMin(3, h / 3); const int base = h / 2; int i = 0; p.setPen(Qt::white); for (i = 0; i < w / 3 +2; ++i) p.drawLine(i * dist, base - amplitude, i * dist + dist / 2, base + amplitude); p.setPen(Qt::blue); for (i = 0; i < w / 3 +2; ++i) p.drawLine(i * dist + dist / 2, base + amplitude, i * dist + dist, base - amplitude); const int y = h/2; p.drawLine(0, y-10, 0, y+10); p.drawLine(w - 1, y-10, w - 1, y+10); } else { const int dist = 3; const int amplitude = qMin(3, w / 3); const int base = w / 2; int i = 0; p.setPen(Qt::white); for (i = 0; i < h / 3 +2; ++i) p.drawLine(base - amplitude, i * dist, base + amplitude,i * dist + dist / 2); p.setPen(Qt::blue); for (i = 0; i < h / 3 +2; ++i) p.drawLine(base + amplitude, i * dist + dist / 2, base - amplitude, i * dist + dist); const int x = w/2; p.drawLine(x-10, 0, x+10, 0); p.drawLine(x-10, h - 1, x+10, h - 1); } } void Spacer::resizeEvent(QResizeEvent* e) { QWidget::resizeEvent(e); // When resized by widget handle dragging after a reset (QSize(0, 0)): // Mark the property as changed (geometry and sizeHint are in sync except for 'changed'). if (m_formWindow) { const QSize oldSize = e->oldSize(); if (oldSize.isNull() || oldSize.width() <= m_SizeOffset.width() || oldSize.height() <= m_SizeOffset.height()) if (QDesignerPropertySheetExtension *sheet = qt_extension(m_formWindow->core()->extensionManager(), this)) sheet->setChanged(sheet->indexOf(QLatin1String("sizeHint")), true); } updateMask(); if (!m_interactive) return; if (!isInLayout()) { // Allow size-handle resize only if not in layout const QSize currentSize = size(); if (currentSize.width() >= m_SizeOffset.width() && currentSize.height() >= m_SizeOffset.height()) m_sizeHint = currentSize - m_SizeOffset; } } void Spacer::updateMask() { QRegion r(rect()); const int w = width(); const int h = height(); if (w > 1 && h > 1) { if (m_orientation == Qt::Horizontal) { const int amplitude = qMin(3, h / 3); const int base = h / 2; r = r.subtract(QRect(1, 0, w - 2, base - amplitude)); r = r.subtract(QRect(1, base + amplitude, w - 2, h - base - amplitude)); } else { const int amplitude = qMin(3, w / 3); const int base = w / 2; r = r.subtract(QRect(0, 1, base - amplitude, h - 2)); r = r.subtract(QRect(base + amplitude, 1, w - base - amplitude, h - 2)); } } setMask(r); } void Spacer::setSizeType(QSizePolicy::Policy t) { const QSizePolicy sizeP = m_orientation == Qt::Vertical ? QSizePolicy(QSizePolicy::Minimum, t) : QSizePolicy(t, QSizePolicy::Minimum); setSizePolicy(sizeP); } QSizePolicy::Policy Spacer::sizeType() const { return m_orientation == Qt::Vertical ? sizePolicy().verticalPolicy() : sizePolicy().horizontalPolicy(); } Qt::Alignment Spacer::alignment() const { // For grid layouts return m_orientation == Qt::Vertical ? Qt::AlignHCenter : Qt::AlignVCenter; } QSize Spacer::sizeHint() const { return isInLayout() ? m_sizeHint : m_sizeHint + m_SizeOffset; } QSize Spacer::sizeHintProperty() const { return m_sizeHint; } void Spacer::setSizeHintProperty(const QSize &s) { m_sizeHint = s; if (!isInLayout()) // Visible resize only if not in layout resize(s + m_SizeOffset); updateGeometry(); } Qt::Orientation Spacer::orientation() const { return m_orientation; } void Spacer::setOrientation(Qt::Orientation o) { if (m_orientation == o) return; const QSizePolicy::Policy st = sizeType(); // flip size type m_orientation = o; setSizeType(st); if (m_interactive) { m_sizeHint = QSize(m_sizeHint.height(), m_sizeHint.width()); if (!isInLayout()) resize(m_sizeHint + m_SizeOffset); } updateMask(); update(); updateGeometry(); } void Spacer::updateToolTip() { const QString format = m_orientation == Qt::Horizontal ? tr("Horizontal Spacer '%1', %2 x %3") : tr("Vertical Spacer '%1', %2 x %3"); QString msg = format.arg(objectName()).arg(m_sizeHint.width()).arg(m_sizeHint.height()); setToolTip(msg); } QT_END_NAMESPACE