彻底改版2.0
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feiyangqingyun
312
third/designer/lib/shared/layoutinfo.cpp
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312
third/designer/lib/shared/layoutinfo.cpp
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/****************************************************************************
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**
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** Copyright (C) 2010 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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** Commercial Usage
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** Licensees holding valid Qt Commercial licenses may use this file in
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** accordance with the Qt Commercial License Agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and Nokia.
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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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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3.0 as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU General Public License version 3.0 requirements will be
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** met: http://www.gnu.org/copyleft/gpl.html.
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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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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "layoutinfo_p.h"
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#include <QtDesigner/QDesignerFormEditorInterface>
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#include <QtDesigner/QDesignerContainerExtension>
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#include <QtDesigner/QDesignerMetaDataBaseInterface>
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#include <QtDesigner/QExtensionManager>
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#include <QtGui/QHBoxLayout>
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#include <QtGui/QFormLayout>
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#include <QtGui/QSplitter>
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#include <QtCore/QDebug>
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#include <QtCore/QHash>
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#include <QtCore/QRect>
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QT_BEGIN_NAMESPACE
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namespace qdesigner_internal {
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/*!
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\overload
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*/
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LayoutInfo::Type LayoutInfo::layoutType(const QDesignerFormEditorInterface *core, const QLayout *layout)
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{
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Q_UNUSED(core)
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if (!layout)
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return NoLayout;
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else if (qobject_cast<const QHBoxLayout*>(layout))
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return HBox;
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else if (qobject_cast<const QVBoxLayout*>(layout))
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return VBox;
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else if (qobject_cast<const QGridLayout*>(layout))
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return Grid;
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else if (qobject_cast<const QFormLayout*>(layout))
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return Form;
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return UnknownLayout;
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}
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static const QHash<QString, LayoutInfo::Type> &layoutNameTypeMap()
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{
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static QHash<QString, LayoutInfo::Type> nameTypeMap;
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if (nameTypeMap.empty()) {
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nameTypeMap.insert(QLatin1String("QVBoxLayout"), LayoutInfo::VBox);
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nameTypeMap.insert(QLatin1String("QHBoxLayout"), LayoutInfo::HBox);
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nameTypeMap.insert(QLatin1String("QGridLayout"), LayoutInfo::Grid);
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nameTypeMap.insert(QLatin1String("QFormLayout"), LayoutInfo::Form);
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}
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return nameTypeMap;
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}
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LayoutInfo::Type LayoutInfo::layoutType(const QString &typeName)
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{
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return layoutNameTypeMap().value(typeName, NoLayout);
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}
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QString LayoutInfo::layoutName(Type t)
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{
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return layoutNameTypeMap().key(t);
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}
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/*!
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\overload
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*/
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LayoutInfo::Type LayoutInfo::layoutType(const QDesignerFormEditorInterface *core, const QWidget *w)
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{
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if (const QSplitter *splitter = qobject_cast<const QSplitter *>(w))
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return splitter->orientation() == Qt::Horizontal ? HSplitter : VSplitter;
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return layoutType(core, w->layout());
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}
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LayoutInfo::Type LayoutInfo::managedLayoutType(const QDesignerFormEditorInterface *core,
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const QWidget *w,
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QLayout **ptrToLayout)
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{
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if (ptrToLayout)
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*ptrToLayout = 0;
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if (const QSplitter *splitter = qobject_cast<const QSplitter *>(w))
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return splitter->orientation() == Qt::Horizontal ? HSplitter : VSplitter;
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QLayout *layout = managedLayout(core, w);
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if (!layout)
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return NoLayout;
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if (ptrToLayout)
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*ptrToLayout = layout;
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return layoutType(core, layout);
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}
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QWidget *LayoutInfo::layoutParent(const QDesignerFormEditorInterface *core, QLayout *layout)
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{
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Q_UNUSED(core)
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QObject *o = layout;
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while (o) {
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if (QWidget *widget = qobject_cast<QWidget*>(o))
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return widget;
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o = o->parent();
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}
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return 0;
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}
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void LayoutInfo::deleteLayout(const QDesignerFormEditorInterface *core, QWidget *widget)
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{
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if (QDesignerContainerExtension *container = qt_extension<QDesignerContainerExtension*>(core->extensionManager(), widget))
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widget = container->widget(container->currentIndex());
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Q_ASSERT(widget != 0);
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QLayout *layout = managedLayout(core, widget);
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if (layout == 0 || core->metaDataBase()->item(layout) != 0) {
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delete layout;
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widget->updateGeometry();
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return;
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}
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qDebug() << "trying to delete an unmanaged layout:" << "widget:" << widget << "layout:" << layout;
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}
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LayoutInfo::Type LayoutInfo::laidoutWidgetType(const QDesignerFormEditorInterface *core,
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QWidget *widget,
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bool *isManaged,
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QLayout **ptrToLayout)
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{
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if (isManaged)
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*isManaged = false;
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if (ptrToLayout)
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*ptrToLayout = 0;
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QWidget *parent = widget->parentWidget();
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if (!parent)
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return NoLayout;
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// 1) Splitter
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if (QSplitter *splitter = qobject_cast<QSplitter*>(parent)) {
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if (isManaged)
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*isManaged = core->metaDataBase()->item(splitter);
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return splitter->orientation() == Qt::Horizontal ? HSplitter : VSplitter;
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}
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// 2) Layout of parent
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QLayout *parentLayout = parent->layout();
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if (!parentLayout)
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return NoLayout;
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if (parentLayout->indexOf(widget) != -1) {
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if (isManaged)
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*isManaged = core->metaDataBase()->item(parentLayout);
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if (ptrToLayout)
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*ptrToLayout = parentLayout;
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return layoutType(core, parentLayout);
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}
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// 3) Some child layout (see below comment about Q3GroupBox)
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const QList<QLayout*> childLayouts = qFindChildren<QLayout*>(parentLayout);
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if (childLayouts.empty())
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return NoLayout;
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const QList<QLayout*>::const_iterator lcend = childLayouts.constEnd();
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for (QList<QLayout*>::const_iterator it = childLayouts.constBegin(); it != lcend; ++it) {
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QLayout *layout = *it;
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if (layout->indexOf(widget) != -1) {
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if (isManaged)
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*isManaged = core->metaDataBase()->item(layout);
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if (ptrToLayout)
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*ptrToLayout = layout;
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return layoutType(core, layout);
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}
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}
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return NoLayout;
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}
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QLayout *LayoutInfo::internalLayout(const QWidget *widget)
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{
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QLayout *widgetLayout = widget->layout();
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if (widgetLayout && widget->inherits("Q3GroupBox")) {
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if (widgetLayout->count()) {
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widgetLayout = widgetLayout->itemAt(0)->layout();
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} else {
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widgetLayout = 0;
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}
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}
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return widgetLayout;
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}
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QLayout *LayoutInfo::managedLayout(const QDesignerFormEditorInterface *core, const QWidget *widget)
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{
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if (widget == 0)
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return 0;
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QLayout *layout = widget->layout();
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if (!layout)
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return 0;
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return managedLayout(core, layout);
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}
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QLayout *LayoutInfo::managedLayout(const QDesignerFormEditorInterface *core, QLayout *layout)
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{
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QDesignerMetaDataBaseInterface *metaDataBase = core->metaDataBase();
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if (!metaDataBase)
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return layout;
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/* This code exists mainly for the Q3GroupBox class, for which
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* widget->layout() returns an internal VBoxLayout. */
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const QDesignerMetaDataBaseItemInterface *item = metaDataBase->item(layout);
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if (item == 0) {
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layout = qFindChild<QLayout*>(layout);
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item = metaDataBase->item(layout);
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}
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if (!item)
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return 0;
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return layout;
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}
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// Is it a a dummy grid placeholder created by Designer?
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bool LayoutInfo::isEmptyItem(QLayoutItem *item)
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{
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if (item == 0) {
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qDebug() << "** WARNING Zero-item passed on to isEmptyItem(). This indicates a layout inconsistency.";
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return true;
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}
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return item->spacerItem() != 0;
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}
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QDESIGNER_SHARED_EXPORT void getFormLayoutItemPosition(const QFormLayout *formLayout, int index, int *rowPtr, int *columnPtr, int *rowspanPtr, int *colspanPtr)
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{
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int row;
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QFormLayout::ItemRole role;
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formLayout->getItemPosition(index, &row, &role);
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const int columnspan = role == QFormLayout::SpanningRole ? 2 : 1;
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const int column = (columnspan > 1 || role == QFormLayout::LabelRole) ? 0 : 1;
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if (rowPtr)
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*rowPtr = row;
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if (columnPtr)
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*columnPtr = column;
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if (rowspanPtr)
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*rowspanPtr = 1;
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if (colspanPtr)
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*colspanPtr = columnspan;
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}
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static inline QFormLayout::ItemRole formLayoutRole(int column, int colspan)
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{
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if (colspan > 1)
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return QFormLayout::SpanningRole;
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return column == 0 ? QFormLayout::LabelRole : QFormLayout::FieldRole;
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}
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QDESIGNER_SHARED_EXPORT void formLayoutAddWidget(QFormLayout *formLayout, QWidget *w, const QRect &r, bool insert)
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{
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// Consistent API galore...
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if (insert) {
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const bool spanning = r.width() > 1;
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if (spanning) {
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formLayout->insertRow(r.y(), w);
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} else {
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QWidget *label = 0, *field = 0;
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if (r.x() == 0) {
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label = w;
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} else {
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field = w;
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}
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formLayout->insertRow(r.y(), label, field);
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}
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} else {
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formLayout->setWidget(r.y(), formLayoutRole(r.x(), r.width()), w);
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}
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}
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} // namespace qdesigner_internal
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QT_END_NAMESPACE
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