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/*
* Copyright 2011 Aurélien Gâteau <agateau@kde.org>
* License: BSD-3-Clause
*/
#include <ColumnResizer.h>
#include <QDebug>
#include <QEvent>
#include <QFormLayout>
#include <QGridLayout>
#include <QTimer>
#include <QWidget>
class FormLayoutWidgetItem : public QWidgetItem
{
public:
FormLayoutWidgetItem(QWidget* widget, QFormLayout* formLayout, QFormLayout::ItemRole itemRole)
: QWidgetItem(widget)
, m_width(-1)
, m_formLayout(formLayout)
, m_itemRole(itemRole)
{}
QSize sizeHint() const
{
QSize size = QWidgetItem::sizeHint();
if (m_width != -1) {
size.setWidth(m_width);
}
return size;
}
QSize minimumSize() const
{
QSize size = QWidgetItem::minimumSize();
if (m_width != -1) {
size.setWidth(m_width);
}
return size;
}
QSize maximumSize() const
{
QSize size = QWidgetItem::maximumSize();
if (m_width != -1) {
size.setWidth(m_width);
}
return size;
}
void setWidth(int width)
{
if (width != m_width) {
m_width = width;
invalidate();
}
}
void setGeometry(const QRect& _rect)
{
QRect rect = _rect;
int width = widget()->sizeHint().width();
if (m_itemRole == QFormLayout::LabelRole && m_formLayout->labelAlignment() & Qt::AlignRight) {
rect.setLeft(rect.right() - width);
}
QWidgetItem::setGeometry(rect);
}
QFormLayout* formLayout() const
{
return m_formLayout;
}
private:
int m_width;
QFormLayout* m_formLayout;
QFormLayout::ItemRole m_itemRole;
};
typedef QPair<QGridLayout*, int> GridColumnInfo;
class ColumnResizerPrivate
{
public:
ColumnResizerPrivate(ColumnResizer* q_ptr)
: q(q_ptr)
, m_updateTimer(new QTimer(q))
{
m_updateTimer->setSingleShot(true);
m_updateTimer->setInterval(0);
QObject::connect(m_updateTimer, SIGNAL(timeout()), q, SLOT(updateWidth()));
}
void scheduleWidthUpdate()
{
m_updateTimer->start();
}
ColumnResizer* q;
QTimer* m_updateTimer;
QList<QWidget*> m_widgets;
QList<FormLayoutWidgetItem*> m_wrWidgetItemList;
QList<GridColumnInfo> m_gridColumnInfoList;
};
ColumnResizer::ColumnResizer(QObject* parent)
: QObject(parent)
, d(new ColumnResizerPrivate(this))
{}
ColumnResizer::~ColumnResizer()
{
delete d;
}
void ColumnResizer::addWidget(QWidget* widget)
{
d->m_widgets.append(widget);
widget->installEventFilter(this);
d->scheduleWidthUpdate();
}
void ColumnResizer::updateWidth()
{
int width = 0;
Q_FOREACH(QWidget* widget, d->m_widgets) {
width = qMax(widget->sizeHint().width(), width);
}
Q_FOREACH(FormLayoutWidgetItem* item, d->m_wrWidgetItemList) {
item->setWidth(width);
item->formLayout()->update();
}
Q_FOREACH(GridColumnInfo info, d->m_gridColumnInfoList) {
info.first->setColumnMinimumWidth(info.second, width);
}
}
bool ColumnResizer::eventFilter(QObject*, QEvent* event)
{
if (event->type() == QEvent::Resize) {
d->scheduleWidthUpdate();
}
return false;
}
void ColumnResizer::addWidgetsFromLayout(QLayout* layout, int column)
{
Q_ASSERT(column >= 0);
QGridLayout* gridLayout = qobject_cast<QGridLayout*>(layout);
QFormLayout* formLayout = qobject_cast<QFormLayout*>(layout);
if (gridLayout) {
addWidgetsFromGridLayout(gridLayout, column);
} else if (formLayout) {
if (column > QFormLayout::SpanningRole) {
qCritical() << "column should not be more than" << QFormLayout::SpanningRole << "for QFormLayout";
return;
}
QFormLayout::ItemRole role = static_cast<QFormLayout::ItemRole>(column);
addWidgetsFromFormLayout(formLayout, role);
} else {
qCritical() << "Don't know how to handle layout" << layout;
}
}
void ColumnResizer::addWidgetsFromGridLayout(QGridLayout* layout, int column)
{
for (int row = 0; row < layout->rowCount(); ++row) {
QLayoutItem* item = layout->itemAtPosition(row, column);
if (!item) {
continue;
}
QWidget* widget = item->widget();
if (!widget) {
continue;
}
addWidget(widget);
}
d->m_gridColumnInfoList << GridColumnInfo(layout, column);
}
void ColumnResizer::addWidgetsFromFormLayout(QFormLayout* layout, QFormLayout::ItemRole role)
{
for (int row = 0; row < layout->rowCount(); ++row) {
QLayoutItem* item = layout->itemAt(row, role);
if (!item) {
continue;
}
QWidget* widget = item->widget();
if (!widget) {
continue;
}
layout->removeItem(item);
delete item;
FormLayoutWidgetItem* newItem = new FormLayoutWidgetItem(widget, layout, role);
layout->setItem(row, role, newItem);
addWidget(widget);
d->m_wrWidgetItemList << newItem;
}
}
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