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/***************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (directui@nokia.com)
**
** This file is part of libmeegotouch.
**
** If you have questions regarding the use of this file, please contact
** Nokia at directui@nokia.com.
**
** This library is free software; you can redistribute it and/or
** modify it 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.
**
****************************************************************************/
#include "mlinearlayoutpolicy_p.h"
#include <QtGui/QGraphicsLinearLayout>
#include <QtGui/QGraphicsWidget>
#include <QtGui/QWidget>
#include "mwidgetcontroller.h"
#include "mlayout.h"
#include "mlayouthelper_p.h"
MLinearLayoutPolicyPrivate::MLinearLayoutPolicyPrivate(MLayout *layout, Qt::Orientation orientation) :
MAbstractLayoutPolicyPrivate(layout),
engineWidget(new QGraphicsWidget),
engine(new QGraphicsLinearLayout(orientation, engineWidget)),
rowCount(0),
notifyWidgetsOfLayoutPositionEnabled(false)
{
}
MLinearLayoutPolicyPrivate::~MLinearLayoutPolicyPrivate()
{
delete engineWidget; //This deletes the engine, which in turn deletes all of its proxy children (they are setOwnedByLayout(true))
}
void MLinearLayoutPolicyPrivate::fixIndex(int *index) const
{
if (uint(*index) >= uint(rowCount))
*index = rowCount;
}
void MLinearLayoutPolicyPrivate::refreshEngine()
{
//Make sure that we have our RTL/LTR correct
bool directionChanged = engineWidget->layoutDirection() != layout->layoutDirection();
if (directionChanged)
engineWidget->setLayoutDirection(layout->layoutDirection());
for (int i = engine->count() - 1; i >= 0; --i) {
ProxyItem *item = static_cast<ProxyItem *>(engine->itemAt(i));
item->refresh();
}
qreal left, top, right, bottom;
layout->getContentsMargins(&left, &top, &right, &bottom);
engine->setContentsMargins(left, top, right, bottom);
engine->updateGeometry();
if (directionChanged && notifyWidgetsOfLayoutPositionEnabled)
notifyAllWidgetsOfLayoutPosition();
}
void MLinearLayoutPolicyPrivate::refreshWidget()
{
//We need to make engine->geometry() equal the layout->geometry() so that the items are in the right place
qreal topMargin = layout->geometry().top();
qreal leftMargin = layout->geometry().left();
engineWidget->setContentsMargins(leftMargin, topMargin, 0, 0);
qreal width = layout->geometry().right();
qreal height = layout->geometry().bottom();
engineWidget->resize(width, height);
}
void MLinearLayoutPolicyPrivate::notifyWidgetOfLayoutPosition(int index, M::Position position)
{
MWidgetController* widget = dynamic_cast<MWidgetController*>(static_cast<ProxyItem *>(engine->itemAt(index))->proxiedItem());
if (widget)
widget->setLayoutPosition(position);
}
void MLinearLayoutPolicyPrivate::notifyAffectedWidgetsOfLayoutPosition(int index, bool add)
{
if (!notifyWidgetsOfLayoutPositionEnabled)
return;
//setup first, last and center positions based on layout direction (LTR or RTL) and orientation (VERT or HORIZ)
M::Position first, last;
if (layout->layoutDirection() == Qt::LeftToRight) {
first = (engine->orientation() == Qt::Horizontal) ? M::HorizontalLeftPosition : M::VerticalTopPosition;
last = (engine->orientation() == Qt::Horizontal) ? M::HorizontalRightPosition : M::VerticalBottomPosition;
} else {
first = (engine->orientation() == Qt::Horizontal) ? M::HorizontalRightPosition : M::VerticalTopPosition;
last = (engine->orientation() == Qt::Horizontal) ? M::HorizontalLeftPosition : M::VerticalBottomPosition;
}
M::Position center = (engine->orientation() == Qt::Horizontal) ? M::HorizontalCenterPosition : M::VerticalCenterPosition;
//added to index
if (add) {
//no more than three items in the layout, reposition them all
if (engine->count() <= 3) {
notifyAllWidgetsOfLayoutPosition();
} else {
if (index == 0) {
//added as first
notifyWidgetOfLayoutPosition(0, first);
notifyWidgetOfLayoutPosition(1, center);
} else if (index >= engine->count() - 1) {
//added as last
notifyWidgetOfLayoutPosition(engine->count()-2, center);
notifyWidgetOfLayoutPosition(engine->count()-1, last);
} else {
//added to middle
notifyWidgetOfLayoutPosition(index, center);
}
}
} else {
//removing item from index
//remove positioning from the removed item
notifyWidgetOfLayoutPosition(index, M::DefaultPosition);
//change positioning of an affected item if item is removed from first or last position
if (engine->count()-1 > 0) {
if (engine->count() == 2) {
//only one item remains after removal
notifyWidgetOfLayoutPosition((index == 0) ? 1 : 0, M::DefaultPosition);
} else if (index == 0) {
notifyWidgetOfLayoutPosition(1, first);
} else if (index == engine->count()-1) {
notifyWidgetOfLayoutPosition(engine->count()-2, last);
}
}
}
}
void MLinearLayoutPolicyPrivate::notifyAllWidgetsOfLayoutPosition()
{
if (notifyWidgetsOfLayoutPositionEnabled) {
//setup first, last and center positions based on layout direction (LTR or RTL) and orientation (VERT or HORIZ)
M::Position first, last;
if (layout->layoutDirection() == Qt::LeftToRight) {
first = (engine->orientation() == Qt::Horizontal) ? M::HorizontalLeftPosition : M::VerticalTopPosition;
last = (engine->orientation() == Qt::Horizontal) ? M::HorizontalRightPosition : M::VerticalBottomPosition;
} else {
first = (engine->orientation() == Qt::Horizontal) ? M::HorizontalRightPosition : M::VerticalTopPosition;
last = (engine->orientation() == Qt::Horizontal) ? M::HorizontalLeftPosition : M::VerticalBottomPosition;
}
M::Position center = (engine->orientation() == Qt::Horizontal) ? M::HorizontalCenterPosition : M::VerticalCenterPosition;;
if (engine->count() == 1) {
//only one item in the layout
notifyWidgetOfLayoutPosition(0, M::DefaultPosition);
} else if (engine->count() > 1) {
//more than one item in the layout
notifyWidgetOfLayoutPosition(0, first);
notifyWidgetOfLayoutPosition(engine->count()-1, last);
for (int i = 1; i < engine->count()-1; ++i) {
notifyWidgetOfLayoutPosition(i, center);
}
}
//remove positioning from all the items
} else {
for (int i = 0; i < engine->count(); ++i) {
notifyWidgetOfLayoutPosition(i, M::DefaultPosition);
}
}
}
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