QTfrontend/ui/widget/flowlayout.cpp
author nemo
Tue, 29 Jan 2013 13:45:31 -0500
changeset 8460 75e771c3c039
parent 8434 4821897a0f10
permissions -rw-r--r--
fix EndGame call. w/o a proper exit, demos weren't being saved
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 /****************************************************************************
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 **
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 ** Copyright (C) 2011 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 examples of the Qt Toolkit.
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 **
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 ** $QT_BEGIN_LICENSE:BSD$
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 ** You may use this file under the terms of the BSD license as follows:
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 **
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 ** "Redistribution and use in source and binary forms, with or without
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 ** modification, are permitted provided that the following conditions are
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 ** met:
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 **   * Redistributions of source code must retain the above copyright
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 **     notice, this list of conditions and the following disclaimer.
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 **   * Redistributions in binary form must reproduce the above copyright
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 **     notice, this list of conditions and the following disclaimer in
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 **     the documentation and/or other materials provided with the
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 **     distribution.
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 **   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
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 **     the names of its contributors may be used to endorse or promote
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 **     products derived from this software without specific prior written
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 **     permission.
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 **
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 ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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 ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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 ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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 ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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 ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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 ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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 ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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 ** $QT_END_LICENSE$
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 **
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 ****************************************************************************/
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 #include <QtGui>
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 #include "flowlayout.h"
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FlowLayout::FlowLayout(QWidget *parent, int margin, int hSpacing, int vSpacing)
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    : QLayout(parent), m_hSpace(hSpacing), m_vSpace(vSpacing)
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{
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    setContentsMargins(margin, margin, margin, margin);
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}
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FlowLayout::FlowLayout(int margin, int hSpacing, int vSpacing)
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    : m_hSpace(hSpacing), m_vSpace(vSpacing)
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{
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    setContentsMargins(margin, margin, margin, margin);
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}
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FlowLayout::~FlowLayout()
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{
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    QLayoutItem *item;
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    while ((item = takeAt(0)))
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        delete item;
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}
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void FlowLayout::addItem(QLayoutItem *item)
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{
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    itemList.append(item);
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}
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int FlowLayout::horizontalSpacing() const
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{
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    if (m_hSpace >= 0) {
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        return m_hSpace;
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    } else {
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        return smartSpacing(QStyle::PM_LayoutHorizontalSpacing);
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    }
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}
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int FlowLayout::verticalSpacing() const
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{
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    if (m_vSpace >= 0) {
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        return m_vSpace;
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    } else {
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        return smartSpacing(QStyle::PM_LayoutVerticalSpacing);
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    }
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}
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int FlowLayout::count() const
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{
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    return itemList.size();
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}
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QLayoutItem *FlowLayout::itemAt(int index) const
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{
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    return itemList.value(index);
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}
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QLayoutItem *FlowLayout::takeAt(int index)
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{
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    if (index >= 0 && index < itemList.size())
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        return itemList.takeAt(index);
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    else
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        return 0;
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}
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Qt::Orientations FlowLayout::expandingDirections() const
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{
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    return 0;
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}
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bool FlowLayout::hasHeightForWidth() const
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{
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    return true;
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}
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int FlowLayout::heightForWidth(int width) const
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{
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    int height = doLayout(QRect(0, 0, width, 0), true);
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    return height;
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}
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void FlowLayout::setGeometry(const QRect &rect)
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{
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    QLayout::setGeometry(rect);
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    doLayout(rect, false);
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}
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QSize FlowLayout::sizeHint() const
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{
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    return minimumSize();
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}
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QSize FlowLayout::minimumSize() const
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{
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    QSize size;
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    QLayoutItem *item;
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    foreach (item, itemList)
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        size = size.expandedTo(item->minimumSize());
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    size += QSize(2*margin(), 2*margin());
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    return size;
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}
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int FlowLayout::doLayout(const QRect &rect, bool testOnly) const
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{
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    int left, top, right, bottom;
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    getContentsMargins(&left, &top, &right, &bottom);
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    QRect effectiveRect = rect.adjusted(+left, +top, -right, -bottom);
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    int x = effectiveRect.x();
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    int y = effectiveRect.y();
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    int lineHeight = 0;
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    QLayoutItem *item;
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    foreach (item, itemList) {
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        QWidget *wid = item->widget();
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        int spaceX = horizontalSpacing();
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        if (spaceX == -1)
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            spaceX = wid->style()->layoutSpacing(
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                QSizePolicy::PushButton, QSizePolicy::PushButton, Qt::Horizontal);
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        int spaceY = verticalSpacing();
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        if (spaceY == -1)
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            spaceY = wid->style()->layoutSpacing(
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                QSizePolicy::PushButton, QSizePolicy::PushButton, Qt::Vertical);
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        int nextX = x + item->sizeHint().width() + spaceX;
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        if (nextX - spaceX > effectiveRect.right() && lineHeight > 0) {
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            x = effectiveRect.x();
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            y = y + lineHeight + spaceY;
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            nextX = x + item->sizeHint().width() + spaceX;
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            lineHeight = 0;
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        }
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        if (!testOnly)
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            item->setGeometry(QRect(QPoint(x, y), item->sizeHint()));
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        x = nextX;
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        lineHeight = qMax(lineHeight, item->sizeHint().height());
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    }
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    return y + lineHeight - rect.y() + bottom;
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}
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int FlowLayout::smartSpacing(QStyle::PixelMetric pm) const
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{
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    QObject *parent = this->parent();
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    if (!parent) {
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        return -1;
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    } else if (parent->isWidgetType()) {
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        QWidget *pw = static_cast<QWidget *>(parent);
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        return pw->style()->pixelMetric(pm, 0, pw);
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    } else {
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        return static_cast<QLayout *>(parent)->spacing();
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    }
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}