diff options
Diffstat (limited to 'gui/ColumnResizer.cpp')
-rw-r--r-- | gui/ColumnResizer.cpp | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/gui/ColumnResizer.cpp b/gui/ColumnResizer.cpp new file mode 100644 index 00000000..1c5597aa --- /dev/null +++ b/gui/ColumnResizer.cpp @@ -0,0 +1,202 @@ +/* + * Copyright 2011 Aurélien Gâteau <agateau@kde.org> + * License: LGPL v2.1 or later (see COPYING) + */ +#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; + } +} + +#include <ColumnResizer.moc> +// vi: ts=4 sw=4 et |