transmission/qt/ColumnResizer.cc

91 lines
1.8 KiB
C++

/*
* This file Copyright (C) 2015 Mnemosyne LLC
*
* It may be used under the GNU GPL versions 2 or 3
* or any future license endorsed by Mnemosyne LLC.
*
*/
#include <QEvent>
#include <QGridLayout>
#include <QTimer>
#include "ColumnResizer.h"
namespace
{
int itemColumnSpan(QGridLayout* layout, QLayoutItem const* item)
{
for (int i = 0, count = layout->count(); i < count; ++i)
{
if (layout->itemAt(i) != item)
{
continue;
}
int row, column, rowSpan, columnSpan;
layout->getItemPosition(i, &row, &column, &rowSpan, &columnSpan);
return columnSpan;
}
return 0;
}
} // namespace
ColumnResizer::ColumnResizer(QObject* parent) :
QObject(parent),
myTimer(new QTimer(this)),
myLayouts()
{
myTimer->setSingleShot(true);
connect(myTimer, SIGNAL(timeout()), SLOT(update()));
}
void ColumnResizer::addLayout(QGridLayout* layout)
{
myLayouts << layout;
scheduleUpdate();
}
bool ColumnResizer::eventFilter(QObject* object, QEvent* event)
{
if (event->type() == QEvent::Resize)
{
scheduleUpdate();
}
return QObject::eventFilter(object, event);
}
void ColumnResizer::update()
{
int maxWidth = 0;
for (QGridLayout* const layout : myLayouts)
{
for (int i = 0, count = layout->rowCount(); i < count; ++i)
{
QLayoutItem* item = layout->itemAtPosition(i, 0);
if (item == nullptr || itemColumnSpan(layout, item) > 1)
{
continue;
}
maxWidth = qMax(maxWidth, item->sizeHint().width());
}
}
for (QGridLayout* const layout : myLayouts)
{
layout->setColumnMinimumWidth(0, maxWidth);
}
}
void ColumnResizer::scheduleUpdate()
{
myTimer->start(0);
}