qt_demoe/designer/lib/shared/layoutinfo.cpp

313 lines
10 KiB
C++

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