treewidgetcolumnstretcher.cpp

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/* 
 * This program is free software; you can redistribute it and/or modify 
 * it under the terms of the GNU General Public License as published by 
 * the Free Software Foundation; either version 3 of the License, or 
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful, but 
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 
 * for more details.
 * 
 * You should have received a copy of the GNU General Public License along 
 * with this program; if not, see <http://www.gnu.org/licenses/>
 */

#include "treewidgetcolumnstretcher.h"
#include <QTreeWidget>
#include <QHideEvent>
#include <QHeaderView>
using namespace Utils;

TreeWidgetColumnStretcher::TreeWidgetColumnStretcher(QTreeWidget *treeWidget, int columnToStretch)
        : QObject(treeWidget->header()), m_columnToStretch(columnToStretch)
{
    parent()->installEventFilter(this);
    QHideEvent fake;
    TreeWidgetColumnStretcher::eventFilter(parent(), &fake);
}

bool TreeWidgetColumnStretcher::eventFilter(QObject *obj, QEvent *ev)
{
    if (obj == parent()) {
        if (ev->type() == QEvent::Show) {
            QHeaderView *hv = qobject_cast<QHeaderView*>(obj);
            for (int i = 0; i < hv->count(); ++i)
                hv->setSectionResizeMode(i, QHeaderView::Interactive);
        } else if (ev->type() == QEvent::Hide) {
            QHeaderView *hv = qobject_cast<QHeaderView*>(obj);
            for (int i = 0; i < hv->count(); ++i)
                hv->setSectionResizeMode(i, i == m_columnToStretch ? QHeaderView::Stretch : QHeaderView::ResizeToContents);
        } else if (ev->type() == QEvent::Resize) {
            QHeaderView *hv = qobject_cast<QHeaderView*>(obj);
            if (hv->sectionResizeMode(m_columnToStretch) == QHeaderView::Interactive) {
                QResizeEvent *re = static_cast<QResizeEvent*>(ev);
                int diff = re->size().width() - re->oldSize().width() ;
                hv->resizeSection(m_columnToStretch, qMax(32, hv->sectionSize(1) + diff));
            }
        }
    }
    return false;
}