transmission/qt/ColumnResizer.cc

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/*
* 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.
*
* $Id$
*/
#include <QEvent>
#include <QGridLayout>
#include <QTimer>
#include "ColumnResizer.h"
namespace
{
int
itemColumnSpan (QGridLayout * layout, const QLayoutItem * 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;
}
}
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);
}