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|
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://www.qtsoftware.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qitemdelegate.h"
#ifndef QT_NO_ITEMVIEWS
#include <qabstractitemmodel.h>
#include <qapplication.h>
#include <qbrush.h>
#include <qlineedit.h>
#include <qtextedit.h>
#include <qplaintextedit.h>
#include <qpainter.h>
#include <qpalette.h>
#include <qpoint.h>
#include <qrect.h>
#include <qsize.h>
#include <qstyle.h>
#include <qdatetime.h>
#include <qstyleoption.h>
#include <qevent.h>
#include <qpixmap.h>
#include <qbitmap.h>
#include <qpixmapcache.h>
#include <qitemeditorfactory.h>
#include <qmetaobject.h>
#include <qtextlayout.h>
#include <private/qobject_p.h>
#include <private/qdnd_p.h>
#include <private/qtextengine_p.h>
#include <qdebug.h>
#include <qlocale.h>
#include <qdialog.h>
#include <limits.h>
#ifndef DBL_DIG
# define DBL_DIG 10
#endif
QT_BEGIN_NAMESPACE
class QItemDelegatePrivate : public QObjectPrivate
{
Q_DECLARE_PUBLIC(QItemDelegate)
public:
QItemDelegatePrivate() : f(0), clipPainting(true) {}
inline const QItemEditorFactory *editorFactory() const
{ return f ? f : QItemEditorFactory::defaultFactory(); }
inline QIcon::Mode iconMode(QStyle::State state) const
{
if (!(state & QStyle::State_Enabled)) return QIcon::Disabled;
if (state & QStyle::State_Selected) return QIcon::Selected;
return QIcon::Normal;
}
inline QIcon::State iconState(QStyle::State state) const
{ return state & QStyle::State_Open ? QIcon::On : QIcon::Off; }
inline static QString replaceNewLine(QString text)
{
const QChar nl = QLatin1Char('\n');
for (int i = 0; i < text.count(); ++i)
if (text.at(i) == nl)
text[i] = QChar::LineSeparator;
return text;
}
static QString valueToText(const QVariant &value, const QStyleOptionViewItemV4 &option);
void _q_commitDataAndCloseEditor(QWidget *editor);
QItemEditorFactory *f;
bool clipPainting;
QRect textLayoutBounds(const QStyleOptionViewItemV2 &options) const;
QSizeF doTextLayout(int lineWidth) const;
mutable QTextLayout textLayout;
mutable QTextOption textOption;
const QWidget *widget(const QStyleOptionViewItem &option) const
{
if (const QStyleOptionViewItemV3 *v3 = qstyleoption_cast<const QStyleOptionViewItemV3 *>(&option))
return v3->widget;
return 0;
}
// ### temporary hack until we have QStandardItemDelegate
mutable struct Icon {
QIcon icon;
QIcon::Mode mode;
QIcon::State state;
} tmp;
};
void QItemDelegatePrivate::_q_commitDataAndCloseEditor(QWidget *editor)
{
Q_Q(QItemDelegate);
emit q->commitData(editor);
emit q->closeEditor(editor, QAbstractItemDelegate::SubmitModelCache);
}
QRect QItemDelegatePrivate::textLayoutBounds(const QStyleOptionViewItemV2 &option) const
{
QRect rect = option.rect;
const bool wrapText = option.features & QStyleOptionViewItemV2::WrapText;
switch (option.decorationPosition) {
case QStyleOptionViewItem::Left:
case QStyleOptionViewItem::Right:
rect.setWidth(wrapText && rect.isValid() ? rect.width() : (QFIXED_MAX));
break;
case QStyleOptionViewItem::Top:
case QStyleOptionViewItem::Bottom:
rect.setWidth(wrapText ? option.decorationSize.width() : (QFIXED_MAX));
break;
}
return rect;
}
QSizeF QItemDelegatePrivate::doTextLayout(int lineWidth) const
{
qreal height = 0;
qreal widthUsed = 0;
textLayout.beginLayout();
while (true) {
QTextLine line = textLayout.createLine();
if (!line.isValid())
break;
line.setLineWidth(lineWidth);
line.setPosition(QPointF(0, height));
height += line.height();
widthUsed = qMax(widthUsed, line.naturalTextWidth());
}
textLayout.endLayout();
return QSizeF(widthUsed, height);
}
/*!
\class QItemDelegate
\brief The QItemDelegate class provides display and editing facilities for
data items from a model.
\ingroup model-view
\mainclass
QItemDelegate can be used to provide custom display features and editor
widgets for item views based on QAbstractItemView subclasses. Using a
delegate for this purpose allows the display and editing mechanisms to be
customized and developed independently from the model and view.
The QItemDelegate class is one of the \l{Model/View Classes} and
is part of Qt's \l{Model/View Programming}{model/view framework}.
Note that QStyledItemDelegate has taken over the job of drawing
Qt's item views. We recommend the use of QStyledItemDelegate when
creating new delegates.
When displaying items from a custom model in a standard view, it is
often sufficient to simply ensure that the model returns appropriate
data for each of the \l{Qt::ItemDataRole}{roles} that determine the
appearance of items in views. The default delegate used by Qt's
standard views uses this role information to display items in most
of the common forms expected by users. However, it is sometimes
necessary to have even more control over the appearance of items than
the default delegate can provide.
This class provides default implementations of the functions for
painting item data in a view and editing data from item models.
Default implementations of the paint() and sizeHint() virtual
functions, defined in QAbstractItemDelegate, are provided to
ensure that the delegate implements the correct basic behavior
expected by views. You can reimplement these functions in
subclasses to customize the appearance of items.
When editing data in an item view, QItemDelegate provides an
editor widget, which is a widget that is placed on top of the view
while editing takes place. Editors are created with a
QItemEditorFactory; a default static instance provided by
QItemEditorFactory is installed on all item delegates. You can set
a custom factory using setItemEditorFactory() or set a new default
factory with QItemEditorFactory::setDefaultFactory(). It is the
data stored in the item model with the Qt::EditRole that is edited.
Only the standard editing functions for widget-based delegates are
reimplemented here:
\list
\o createEditor() returns the widget used to change data from the model
and can be reimplemented to customize editing behavior.
\o setEditorData() provides the widget with data to manipulate.
\o updateEditorGeometry() ensures that the editor is displayed correctly
with respect to the item view.
\o setModelData() returns updated data to the model.
\endlist
The closeEditor() signal indicates that the user has completed editing the data,
and that the editor widget can be destroyed.
\section1 Standard Roles and Data Types
The default delegate used by the standard views supplied with Qt
associates each standard role (defined by Qt::ItemDataRole) with certain
data types. Models that return data in these types can influence the
appearance of the delegate as described in the following table.
\table
\header \o Role \o Accepted Types
\omit
\row \o \l Qt::AccessibleDescriptionRole \o QString
\row \o \l Qt::AccessibleTextRole \o QString
\endomit
\row \o \l Qt::BackgroundRole \o QBrush
\row \o \l Qt::BackgroundColorRole \o QColor (obsolete; use Qt::BackgroundRole instead)
\row \o \l Qt::CheckStateRole \o Qt::CheckState
\row \o \l Qt::DecorationRole \o QIcon and QColor
\row \o \l Qt::DisplayRole \o QString and types with a string representation
\row \o \l Qt::EditRole \o See QItemEditorFactory for details
\row \o \l Qt::FontRole \o QFont
\row \o \l Qt::SizeHintRole \o QSize
\omit
\row \o \l Qt::StatusTipRole \o
\endomit
\row \o \l Qt::TextAlignmentRole \o Qt::Alignment
\row \o \l Qt::ForegroundRole \o QBrush
\row \o \l Qt::TextColorRole \o QColor (obsolete; use Qt::ForegroundRole instead)
\omit
\row \o \l Qt::ToolTipRole
\row \o \l Qt::WhatsThisRole
\endomit
\endtable
If the default delegate does not allow the level of customization that
you need, either for display purposes or for editing data, it is possible to
subclass QItemDelegate to implement the desired behavior.
\section1 Subclassing
When subclassing QItemDelegate to create a delegate that displays items
using a custom renderer, it is important to ensure that the delegate can
render items suitably for all the required states; e.g. selected,
disabled, checked. The documentation for the paint() function contains
some hints to show how this can be achieved.
You can provide custom editors by using a QItemEditorFactory. The
\l{Color Editor Factory Example} shows how a custom editor can be
made available to delegates with the default item editor
factory. This way, there is no need to subclass QItemDelegate. An
alternative is to reimplement createEditor(), setEditorData(),
setModelData(), and updateEditorGeometry(). This process is
described in the \l{Spin Box Delegate Example}.
\section1 QStyledItemDelegate vs. QItemDelegate
Since Qt 4.4, there are two delegate classes: QItemDelegate and
QStyledItemDelegate. However, the default delegate is QStyledItemDelegate.
These two classes are independent alternatives to painting and providing
editors for items in views. The difference between them is that
QStyledItemDelegate uses the current style to paint its items. We therefore
recommend using QStyledItemDelegate as the base class when implementing
custom delegates or when working with Qt style sheets. The code required
for either class should be equal unless the custom delegate needs to use
the style for drawing.
\sa {Delegate Classes}, QStyledItemDelegate, QAbstractItemDelegate,
{Spin Box Delegate Example}, {Settings Editor Example},
{Icons Example}
*/
/*!
Constructs an item delegate with the given \a parent.
*/
QItemDelegate::QItemDelegate(QObject *parent)
: QAbstractItemDelegate(*new QItemDelegatePrivate(), parent)
{
}
/*!
Destroys the item delegate.
*/
QItemDelegate::~QItemDelegate()
{
}
/*!
\property QItemDelegate::clipping
\brief if the delegate should clip the paint events
\since 4.2
This property will set the paint clip to the size of the item.
The default value is on. It is useful for cases such
as when images are larger than the size of the item.
*/
bool QItemDelegate::hasClipping() const
{
Q_D(const QItemDelegate);
return d->clipPainting;
}
void QItemDelegate::setClipping(bool clip)
{
Q_D(QItemDelegate);
d->clipPainting = clip;
}
QString QItemDelegatePrivate::valueToText(const QVariant &value, const QStyleOptionViewItemV4 &option)
{
QString text;
switch (value.type()) {
case QVariant::Double:
text = option.locale.toString(value.toDouble(), 'g', DBL_DIG);
break;
case QVariant::Int:
case QVariant::LongLong:
text = option.locale.toString(value.toLongLong());
break;
case QVariant::UInt:
case QVariant::ULongLong:
text = option.locale.toString(value.toULongLong());
break;
case QVariant::Date:
text = option.locale.toString(value.toDate(), QLocale::ShortFormat);
break;
case QVariant::Time:
text = option.locale.toString(value.toTime(), QLocale::ShortFormat);
break;
case QVariant::DateTime:
text = option.locale.toString(value.toDateTime().date(), QLocale::ShortFormat);
text += QLatin1Char(' ');
text += option.locale.toString(value.toDateTime().time(), QLocale::ShortFormat);
break;
default:
text = replaceNewLine(value.toString());
break;
}
return text;
}
/*!
Renders the delegate using the given \a painter and style \a option for
the item specified by \a index.
When reimplementing this function in a subclass, you should update the area
held by the option's \l{QStyleOption::rect}{rect} variable, using the
option's \l{QStyleOption::state}{state} variable to determine the state of
the item to be displayed, and adjust the way it is painted accordingly.
For example, a selected item may need to be displayed differently to
unselected items, as shown in the following code:
\snippet examples/itemviews/pixelator/pixeldelegate.cpp 2
\dots
After painting, you should ensure that the painter is returned to its
the state it was supplied in when this function was called. For example,
it may be useful to call QPainter::save() before painting and
QPainter::restore() afterwards.
\sa QStyle::State
*/
void QItemDelegate::paint(QPainter *painter,
const QStyleOptionViewItem &option,
const QModelIndex &index) const
{
Q_D(const QItemDelegate);
Q_ASSERT(index.isValid());
QStyleOptionViewItemV4 opt = setOptions(index, option);
const QStyleOptionViewItemV2 *v2 = qstyleoption_cast<const QStyleOptionViewItemV2 *>(&option);
opt.features = v2 ? v2->features
: QStyleOptionViewItemV2::ViewItemFeatures(QStyleOptionViewItemV2::None);
const QStyleOptionViewItemV3 *v3 = qstyleoption_cast<const QStyleOptionViewItemV3 *>(&option);
opt.locale = v3 ? v3->locale : QLocale();
opt.widget = v3 ? v3->widget : 0;
// prepare
painter->save();
if (d->clipPainting)
painter->setClipRect(opt.rect);
// get the data and the rectangles
QVariant value;
QPixmap pixmap;
QRect decorationRect;
value = index.data(Qt::DecorationRole);
if (value.isValid()) {
// ### we need the pixmap to call the virtual function
pixmap = decoration(opt, value);
if (value.type() == QVariant::Icon) {
d->tmp.icon = qvariant_cast<QIcon>(value);
d->tmp.mode = d->iconMode(option.state);
d->tmp.state = d->iconState(option.state);
const QSize size = d->tmp.icon.actualSize(option.decorationSize,
d->tmp.mode, d->tmp.state);
decorationRect = QRect(QPoint(0, 0), size);
} else {
d->tmp.icon = QIcon();
decorationRect = QRect(QPoint(0, 0), pixmap.size());
}
} else {
d->tmp.icon = QIcon();
decorationRect = QRect();
}
QString text;
QRect displayRect;
value = index.data(Qt::DisplayRole);
if (value.isValid() && !value.isNull()) {
text = QItemDelegatePrivate::valueToText(value, opt);
displayRect = textRectangle(painter, d->textLayoutBounds(opt), opt.font, text);
}
QRect checkRect;
Qt::CheckState checkState = Qt::Unchecked;
value = index.data(Qt::CheckStateRole);
if (value.isValid()) {
checkState = static_cast<Qt::CheckState>(value.toInt());
checkRect = check(opt, opt.rect, value);
}
// do the layout
doLayout(opt, &checkRect, &decorationRect, &displayRect, false);
// draw the item
drawBackground(painter, opt, index);
drawCheck(painter, opt, checkRect, checkState);
drawDecoration(painter, opt, decorationRect, pixmap);
drawDisplay(painter, opt, displayRect, text);
drawFocus(painter, opt, displayRect);
// done
painter->restore();
}
/*!
Returns the size needed by the delegate to display the item
specified by \a index, taking into account the style information
provided by \a option.
When reimplementing this function, note that in case of text
items, QItemDelegate adds a margin (i.e. 2 *
QStyle::PM_FocusFrameHMargin) to the length of the text.
*/
QSize QItemDelegate::sizeHint(const QStyleOptionViewItem &option,
const QModelIndex &index) const
{
QVariant value = index.data(Qt::SizeHintRole);
if (value.isValid())
return qvariant_cast<QSize>(value);
QRect decorationRect = rect(option, index, Qt::DecorationRole);
QRect displayRect = rect(option, index, Qt::DisplayRole);
QRect checkRect = rect(option, index, Qt::CheckStateRole);
doLayout(option, &checkRect, &decorationRect, &displayRect, true);
return (decorationRect|displayRect|checkRect).size();
}
/*!
Returns the widget used to edit the item specified by \a index
for editing. The \a parent widget and style \a option are used to
control how the editor widget appears.
\sa QAbstractItemDelegate::createEditor()
*/
QWidget *QItemDelegate::createEditor(QWidget *parent,
const QStyleOptionViewItem &,
const QModelIndex &index) const
{
Q_D(const QItemDelegate);
if (!index.isValid())
return 0;
QVariant::Type t = static_cast<QVariant::Type>(index.data(Qt::EditRole).userType());
const QItemEditorFactory *factory = d->f;
if (factory == 0)
factory = QItemEditorFactory::defaultFactory();
return factory->createEditor(t, parent);
}
/*!
Sets the data to be displayed and edited by the \a editor from the
data model item specified by the model \a index.
The default implementation stores the data in the \a editor
widget's \l {Qt's Property System} {user property}.
\sa QMetaProperty::isUser()
*/
void QItemDelegate::setEditorData(QWidget *editor, const QModelIndex &index) const
{
#ifdef QT_NO_PROPERTIES
Q_UNUSED(editor);
Q_UNUSED(index);
#else
Q_D(const QItemDelegate);
QVariant v = index.data(Qt::EditRole);
QByteArray n = editor->metaObject()->userProperty().name();
// ### Qt 5: remove
// A work-around for missing "USER true" in qdatetimeedit.h for
// QTimeEdit's time property and QDateEdit's date property.
// It only triggers if the default user property "dateTime" is
// reported for QTimeEdit and QDateEdit.
if (n == "dateTime") {
if (editor->inherits("QTimeEdit"))
n = "time";
else if (editor->inherits("QDateEdit"))
n = "date";
}
// ### Qt 5: give QComboBox a USER property
if (n.isEmpty() && editor->inherits("QComboBox"))
n = d->editorFactory()->valuePropertyName(static_cast<QVariant::Type>(v.userType()));
if (!n.isEmpty()) {
if (!v.isValid())
v = QVariant(editor->property(n).userType(), (const void *)0);
editor->setProperty(n, v);
}
#endif
}
/*!
Gets data from the \a editor widget and stores it in the specified
\a model at the item \a index.
The default implementation gets the value to be stored in the data
model from the \a editor widget's \l {Qt's Property System} {user
property}.
\sa QMetaProperty::isUser()
*/
void QItemDelegate::setModelData(QWidget *editor,
QAbstractItemModel *model,
const QModelIndex &index) const
{
#ifdef QT_NO_PROPERTIES
Q_UNUSED(model);
Q_UNUSED(editor);
Q_UNUSED(index);
#else
Q_D(const QItemDelegate);
Q_ASSERT(model);
Q_ASSERT(editor);
QByteArray n = editor->metaObject()->userProperty().name();
if (n.isEmpty())
n = d->editorFactory()->valuePropertyName(
static_cast<QVariant::Type>(model->data(index, Qt::EditRole).userType()));
if (!n.isEmpty())
model->setData(index, editor->property(n), Qt::EditRole);
#endif
}
/*!
Updates the \a editor for the item specified by \a index
according to the style \a option given.
*/
void QItemDelegate::updateEditorGeometry(QWidget *editor,
const QStyleOptionViewItem &option,
const QModelIndex &index) const
{
if (!editor)
return;
Q_ASSERT(index.isValid());
QPixmap pixmap = decoration(option, index.data(Qt::DecorationRole));
QString text = QItemDelegatePrivate::replaceNewLine(index.data(Qt::DisplayRole).toString());
QRect pixmapRect = QRect(QPoint(0, 0), option.decorationSize).intersected(pixmap.rect());
QRect textRect = textRectangle(0, option.rect, option.font, text);
QRect checkRect = check(option, textRect, index.data(Qt::CheckStateRole));
QStyleOptionViewItem opt = option;
opt.showDecorationSelected = true; // let the editor take up all available space
doLayout(opt, &checkRect, &pixmapRect, &textRect, false);
editor->setGeometry(textRect);
}
/*!
Returns the editor factory used by the item delegate.
If no editor factory is set, the function will return null.
\sa setItemEditorFactory()
*/
QItemEditorFactory *QItemDelegate::itemEditorFactory() const
{
Q_D(const QItemDelegate);
return d->f;
}
/*!
Sets the editor factory to be used by the item delegate to be the \a factory
specified. If no editor factory is set, the item delegate will use the
default editor factory.
\sa itemEditorFactory()
*/
void QItemDelegate::setItemEditorFactory(QItemEditorFactory *factory)
{
Q_D(QItemDelegate);
d->f = factory;
}
/*!
Renders the item view \a text within the rectangle specified by \a rect
using the given \a painter and style \a option.
*/
void QItemDelegate::drawDisplay(QPainter *painter, const QStyleOptionViewItem &option,
const QRect &rect, const QString &text) const
{
Q_D(const QItemDelegate);
QPen pen = painter->pen();
QPalette::ColorGroup cg = option.state & QStyle::State_Enabled
? QPalette::Normal : QPalette::Disabled;
if (cg == QPalette::Normal && !(option.state & QStyle::State_Active))
cg = QPalette::Inactive;
if (option.state & QStyle::State_Selected) {
painter->fillRect(rect, option.palette.brush(cg, QPalette::Highlight));
painter->setPen(option.palette.color(cg, QPalette::HighlightedText));
} else {
painter->setPen(option.palette.color(cg, QPalette::Text));
}
if (text.isEmpty())
return;
if (option.state & QStyle::State_Editing) {
painter->save();
painter->setPen(option.palette.color(cg, QPalette::Text));
painter->drawRect(rect.adjusted(0, 0, -1, -1));
painter->restore();
}
const QStyleOptionViewItemV4 opt = option;
const QWidget *widget = d->widget(option);
QStyle *style = widget ? widget->style() : QApplication::style();
const int textMargin = style->pixelMetric(QStyle::PM_FocusFrameHMargin, 0, widget) + 1;
QRect textRect = rect.adjusted(textMargin, 0, -textMargin, 0); // remove width padding
const bool wrapText = opt.features & QStyleOptionViewItemV2::WrapText;
d->textOption.setWrapMode(wrapText ? QTextOption::WordWrap : QTextOption::ManualWrap);
d->textOption.setTextDirection(option.direction);
d->textOption.setAlignment(QStyle::visualAlignment(option.direction, option.displayAlignment));
d->textLayout.setTextOption(d->textOption);
d->textLayout.setFont(option.font);
d->textLayout.setText(QItemDelegatePrivate::replaceNewLine(text));
QSizeF textLayoutSize = d->doTextLayout(textRect.width());
if (textRect.width() < textLayoutSize.width()
|| textRect.height() < textLayoutSize.height()) {
QString elided;
int start = 0;
int end = text.indexOf(QChar::LineSeparator, start);
if (end == -1) {
elided += option.fontMetrics.elidedText(text, option.textElideMode, textRect.width());
} else {
while (end != -1) {
elided += option.fontMetrics.elidedText(text.mid(start, end - start),
option.textElideMode, textRect.width());
elided += QChar::LineSeparator;
start = end + 1;
end = text.indexOf(QChar::LineSeparator, start);
}
//let's add the last line (after the last QChar::LineSeparator)
elided += option.fontMetrics.elidedText(text.mid(start),
option.textElideMode, textRect.width());
if (end != -1)
elided += QChar::LineSeparator;
}
d->textLayout.setText(elided);
textLayoutSize = d->doTextLayout(textRect.width());
}
const QSize layoutSize(textRect.width(), int(textLayoutSize.height()));
const QRect layoutRect = QStyle::alignedRect(option.direction, option.displayAlignment,
layoutSize, textRect);
// if we still overflow even after eliding the text, enable clipping
if (!hasClipping() && (textRect.width() < textLayoutSize.width()
|| textRect.height() < textLayoutSize.height())) {
painter->save();
painter->setClipRect(layoutRect);
d->textLayout.draw(painter, layoutRect.topLeft(), QVector<QTextLayout::FormatRange>(), layoutRect);
painter->restore();
} else {
d->textLayout.draw(painter, layoutRect.topLeft(), QVector<QTextLayout::FormatRange>(), layoutRect);
}
}
/*!
Renders the decoration \a pixmap within the rectangle specified by
\a rect using the given \a painter and style \a option.
*/
void QItemDelegate::drawDecoration(QPainter *painter, const QStyleOptionViewItem &option,
const QRect &rect, const QPixmap &pixmap) const
{
Q_D(const QItemDelegate);
// if we have an icon, we ignore the pixmap
if (!d->tmp.icon.isNull()) {
d->tmp.icon.paint(painter, rect, option.decorationAlignment,
d->tmp.mode, d->tmp.state);
return;
}
if (pixmap.isNull() || !rect.isValid())
return;
QPoint p = QStyle::alignedRect(option.direction, option.decorationAlignment,
pixmap.size(), rect).topLeft();
if (option.state & QStyle::State_Selected) {
QPixmap *pm = selected(pixmap, option.palette, option.state & QStyle::State_Enabled);
painter->drawPixmap(p, *pm);
} else {
painter->drawPixmap(p, pixmap);
}
}
/*!
Renders the region within the rectangle specified by \a rect, indicating
that it has the focus, using the given \a painter and style \a option.
*/
void QItemDelegate::drawFocus(QPainter *painter,
const QStyleOptionViewItem &option,
const QRect &rect) const
{
Q_D(const QItemDelegate);
if ((option.state & QStyle::State_HasFocus) == 0 || !rect.isValid())
return;
QStyleOptionFocusRect o;
o.QStyleOption::operator=(option);
o.rect = rect;
o.state |= QStyle::State_KeyboardFocusChange;
o.state |= QStyle::State_Item;
QPalette::ColorGroup cg = (option.state & QStyle::State_Enabled)
? QPalette::Normal : QPalette::Disabled;
o.backgroundColor = option.palette.color(cg, (option.state & QStyle::State_Selected)
? QPalette::Highlight : QPalette::Window);
const QWidget *widget = d->widget(option);
QStyle *style = widget ? widget->style() : QApplication::style();
style->drawPrimitive(QStyle::PE_FrameFocusRect, &o, painter, widget);
}
/*!
Renders a check indicator within the rectangle specified by \a
rect, using the given \a painter and style \a option, using the
given \a state.
*/
void QItemDelegate::drawCheck(QPainter *painter,
const QStyleOptionViewItem &option,
const QRect &rect, Qt::CheckState state) const
{
Q_D(const QItemDelegate);
if (!rect.isValid())
return;
QStyleOptionViewItem opt(option);
opt.rect = rect;
opt.state = opt.state & ~QStyle::State_HasFocus;
switch (state) {
case Qt::Unchecked:
opt.state |= QStyle::State_Off;
break;
case Qt::PartiallyChecked:
opt.state |= QStyle::State_NoChange;
break;
case Qt::Checked:
opt.state |= QStyle::State_On;
break;
}
const QWidget *widget = d->widget(option);
QStyle *style = widget ? widget->style() : QApplication::style();
style->drawPrimitive(QStyle::PE_IndicatorViewItemCheck, &opt, painter, widget);
}
/*!
\since 4.2
Renders the item background for the given \a index,
using the given \a painter and style \a option.
*/
void QItemDelegate::drawBackground(QPainter *painter,
const QStyleOptionViewItem &option,
const QModelIndex &index) const
{
if (option.showDecorationSelected && (option.state & QStyle::State_Selected)) {
QPalette::ColorGroup cg = option.state & QStyle::State_Enabled
? QPalette::Normal : QPalette::Disabled;
if (cg == QPalette::Normal && !(option.state & QStyle::State_Active))
cg = QPalette::Inactive;
painter->fillRect(option.rect, option.palette.brush(cg, QPalette::Highlight));
} else {
QVariant value = index.data(Qt::BackgroundRole);
if (qVariantCanConvert<QBrush>(value)) {
QPointF oldBO = painter->brushOrigin();
painter->setBrushOrigin(option.rect.topLeft());
painter->fillRect(option.rect, qvariant_cast<QBrush>(value));
painter->setBrushOrigin(oldBO);
}
}
}
/*!
\internal
Code duplicated in QCommonStylePrivate::viewItemLayout
*/
void QItemDelegate::doLayout(const QStyleOptionViewItem &option,
QRect *checkRect, QRect *pixmapRect, QRect *textRect,
bool hint) const
{
Q_ASSERT(checkRect && pixmapRect && textRect);
Q_D(const QItemDelegate);
const QWidget *widget = d->widget(option);
QStyle *style = widget ? widget->style() : QApplication::style();
const bool hasCheck = checkRect->isValid();
const bool hasPixmap = pixmapRect->isValid();
const bool hasText = textRect->isValid();
const int textMargin = hasText ? style->pixelMetric(QStyle::PM_FocusFrameHMargin, 0, widget) + 1 : 0;
const int pixmapMargin = hasPixmap ? style->pixelMetric(QStyle::PM_FocusFrameHMargin, 0, widget) + 1 : 0;
const int checkMargin = hasCheck ? style->pixelMetric(QStyle::PM_FocusFrameHMargin, 0, widget) + 1 : 0;
int x = option.rect.left();
int y = option.rect.top();
int w, h;
textRect->adjust(-textMargin, 0, textMargin, 0); // add width padding
if (textRect->height() == 0 && (!hasPixmap || !hint)) {
//if there is no text, we still want to have a decent height for the item sizeHint and the editor size
textRect->setHeight(option.fontMetrics.height());
}
QSize pm(0, 0);
if (hasPixmap) {
pm = pixmapRect->size();
pm.rwidth() += 2 * pixmapMargin;
}
if (hint) {
h = qMax(checkRect->height(), qMax(textRect->height(), pm.height()));
if (option.decorationPosition == QStyleOptionViewItem::Left
|| option.decorationPosition == QStyleOptionViewItem::Right) {
w = textRect->width() + pm.width();
} else {
w = qMax(textRect->width(), pm.width());
}
} else {
w = option.rect.width();
h = option.rect.height();
}
int cw = 0;
QRect check;
if (hasCheck) {
cw = checkRect->width() + 2 * checkMargin;
if (hint) w += cw;
if (option.direction == Qt::RightToLeft) {
check.setRect(x + w - cw, y, cw, h);
} else {
check.setRect(x + checkMargin, y, cw, h);
}
}
// at this point w should be the *total* width
QRect display;
QRect decoration;
switch (option.decorationPosition) {
case QStyleOptionViewItem::Top: {
if (hasPixmap)
pm.setHeight(pm.height() + pixmapMargin); // add space
h = hint ? textRect->height() : h - pm.height();
if (option.direction == Qt::RightToLeft) {
decoration.setRect(x, y, w - cw, pm.height());
display.setRect(x, y + pm.height(), w - cw, h);
} else {
decoration.setRect(x + cw, y, w - cw, pm.height());
display.setRect(x + cw, y + pm.height(), w - cw, h);
}
break; }
case QStyleOptionViewItem::Bottom: {
if (hasText)
textRect->setHeight(textRect->height() + textMargin); // add space
h = hint ? textRect->height() + pm.height() : h;
if (option.direction == Qt::RightToLeft) {
display.setRect(x, y, w - cw, textRect->height());
decoration.setRect(x, y + textRect->height(), w - cw, h - textRect->height());
} else {
display.setRect(x + cw, y, w - cw, textRect->height());
decoration.setRect(x + cw, y + textRect->height(), w - cw, h - textRect->height());
}
break; }
case QStyleOptionViewItem::Left: {
if (option.direction == Qt::LeftToRight) {
decoration.setRect(x + cw, y, pm.width(), h);
display.setRect(decoration.right() + 1, y, w - pm.width() - cw, h);
} else {
display.setRect(x, y, w - pm.width() - cw, h);
decoration.setRect(display.right() + 1, y, pm.width(), h);
}
break; }
case QStyleOptionViewItem::Right: {
if (option.direction == Qt::LeftToRight) {
display.setRect(x + cw, y, w - pm.width() - cw, h);
decoration.setRect(display.right() + 1, y, pm.width(), h);
} else {
decoration.setRect(x, y, pm.width(), h);
display.setRect(decoration.right() + 1, y, w - pm.width() - cw, h);
}
break; }
default:
qWarning("doLayout: decoration position is invalid");
decoration = *pixmapRect;
break;
}
if (!hint) { // we only need to do the internal layout if we are going to paint
*checkRect = QStyle::alignedRect(option.direction, Qt::AlignCenter,
checkRect->size(), check);
*pixmapRect = QStyle::alignedRect(option.direction, option.decorationAlignment,
pixmapRect->size(), decoration);
// the text takes up all available space, unless the decoration is not shown as selected
if (option.showDecorationSelected)
*textRect = display;
else
*textRect = QStyle::alignedRect(option.direction, option.displayAlignment,
textRect->size().boundedTo(display.size()), display);
} else {
*checkRect = check;
*pixmapRect = decoration;
*textRect = display;
}
}
/*!
\internal
Returns the pixmap used to decorate the root of the item view.
The style \a option controls the appearance of the root; the \a variant
refers to the data associated with an item.
*/
QPixmap QItemDelegate::decoration(const QStyleOptionViewItem &option, const QVariant &variant) const
{
Q_D(const QItemDelegate);
switch (variant.type()) {
case QVariant::Icon: {
QIcon::Mode mode = d->iconMode(option.state);
QIcon::State state = d->iconState(option.state);
return qvariant_cast<QIcon>(variant).pixmap(option.decorationSize, mode, state); }
case QVariant::Color: {
static QPixmap pixmap(option.decorationSize);
pixmap.fill(qvariant_cast<QColor>(variant));
return pixmap; }
default:
break;
}
return qvariant_cast<QPixmap>(variant);
}
// hacky but faster version of "QString::sprintf("%d-%d", i, enabled)"
static QString qPixmapSerial(quint64 i, bool enabled)
{
ushort arr[] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, '-', '0' + enabled };
ushort *ptr = &arr[16];
while (i > 0) {
// hey - it's our internal representation, so use the ascii character after '9'
// instead of 'a' for hex
*(--ptr) = '0' + i % 16;
i >>= 4;
}
return QString::fromUtf16(ptr, int(&arr[sizeof(arr) / sizeof(ushort)] - ptr));
}
/*!
\internal
Returns the selected version of the given \a pixmap using the given \a palette.
The \a enabled argument decides whether the normal or disabled highlight color of
the palette is used.
*/
QPixmap *QItemDelegate::selected(const QPixmap &pixmap, const QPalette &palette, bool enabled) const
{
QString key = qPixmapSerial(qt_pixmap_id(pixmap), enabled);
QPixmap *pm = QPixmapCache::find(key);
if (!pm) {
QImage img = pixmap.toImage().convertToFormat(QImage::Format_ARGB32_Premultiplied);
QColor color = palette.color(enabled ? QPalette::Normal : QPalette::Disabled,
QPalette::Highlight);
color.setAlphaF((qreal)0.3);
QPainter painter(&img);
painter.setCompositionMode(QPainter::CompositionMode_SourceAtop);
painter.fillRect(0, 0, img.width(), img.height(), color);
painter.end();
QPixmap selected = QPixmap(QPixmap::fromImage(img));
int n = (img.numBytes() >> 10) + 1;
if (QPixmapCache::cacheLimit() < n)
QPixmapCache::setCacheLimit(n);
QPixmapCache::insert(key, selected);
pm = QPixmapCache::find(key);
}
return pm;
}
/*!
\internal
*/
QRect QItemDelegate::rect(const QStyleOptionViewItem &option,
const QModelIndex &index, int role) const
{
Q_D(const QItemDelegate);
QVariant value = index.data(role);
if (role == Qt::CheckStateRole)
return check(option, option.rect, value);
if (value.isValid() && !value.isNull()) {
switch (value.type()) {
case QVariant::Invalid:
break;
case QVariant::Pixmap:
return QRect(QPoint(0, 0), qvariant_cast<QPixmap>(value).size());
case QVariant::Image:
return QRect(QPoint(0, 0), qvariant_cast<QImage>(value).size());
case QVariant::Icon: {
QIcon::Mode mode = d->iconMode(option.state);
QIcon::State state = d->iconState(option.state);
QIcon icon = qvariant_cast<QIcon>(value);
QSize size = icon.actualSize(option.decorationSize, mode, state);
return QRect(QPoint(0, 0), size); }
case QVariant::Color:
return QRect(QPoint(0, 0), option.decorationSize);
case QVariant::String:
default: {
QString text = QItemDelegatePrivate::valueToText(value, option);
value = index.data(Qt::FontRole);
QFont fnt = qvariant_cast<QFont>(value).resolve(option.font);
return textRectangle(0, d->textLayoutBounds(option), fnt, text); }
}
}
return QRect();
}
/*!
\internal
Note that on Mac, if /usr/include/AssertMacros.h is included prior
to QItemDelegate, and the application is building in debug mode, the
check(assertion) will conflict with QItemDelegate::check.
To avoid this problem, add
#ifdef check
#undef check
#endif
after including AssertMacros.h
*/
QRect QItemDelegate::check(const QStyleOptionViewItem &option,
const QRect &bounding, const QVariant &value) const
{
if (value.isValid()) {
Q_D(const QItemDelegate);
QStyleOptionButton opt;
opt.QStyleOption::operator=(option);
opt.rect = bounding;
const QWidget *widget = d->widget(option); // cast
QStyle *style = widget ? widget->style() : QApplication::style();
return style->subElementRect(QStyle::SE_ViewItemCheckIndicator, &opt, widget);
}
return QRect();
}
/*!
\internal
*/
QRect QItemDelegate::textRectangle(QPainter * /*painter*/, const QRect &rect,
const QFont &font, const QString &text) const
{
Q_D(const QItemDelegate);
d->textOption.setWrapMode(QTextOption::WordWrap);
d->textLayout.setTextOption(d->textOption);
d->textLayout.setFont(font);
d->textLayout.setText(QItemDelegatePrivate::replaceNewLine(text));
const QSize size = d->doTextLayout(rect.width()).toSize();
// ###: textRectangle should take style option as argument
const int textMargin = QApplication::style()->pixelMetric(QStyle::PM_FocusFrameHMargin) + 1;
return QRect(0, 0, size.width() + 2 * textMargin, size.height());
}
/*!
\fn bool QItemDelegate::eventFilter(QObject *editor, QEvent *event)
Returns true if the given \a editor is a valid QWidget and the
given \a event is handled; otherwise returns false. The following
key press events are handled by default:
\list
\o \gui Tab
\o \gui Backtab
\o \gui Enter
\o \gui Return
\o \gui Esc
\endlist
In the case of \gui Tab, \gui Backtab, \gui Enter and \gui Return
key press events, the \a editor's data is comitted to the model
and the editor is closed. If the \a event is a \gui Tab key press
the view will open an editor on the next item in the
view. Likewise, if the \a event is a \gui Backtab key press the
view will open an editor on the \e previous item in the view.
If the event is a \gui Esc key press event, the \a editor is
closed \e without committing its data.
\sa commitData(), closeEditor()
*/
bool QItemDelegate::eventFilter(QObject *object, QEvent *event)
{
QWidget *editor = qobject_cast<QWidget*>(object);
if (!editor)
return false;
if (event->type() == QEvent::KeyPress) {
switch (static_cast<QKeyEvent *>(event)->key()) {
case Qt::Key_Tab:
emit commitData(editor);
emit closeEditor(editor, QAbstractItemDelegate::EditNextItem);
return true;
case Qt::Key_Backtab:
emit commitData(editor);
emit closeEditor(editor, QAbstractItemDelegate::EditPreviousItem);
return true;
case Qt::Key_Enter:
case Qt::Key_Return:
#ifndef QT_NO_TEXTEDIT
if (qobject_cast<QTextEdit *>(editor) || qobject_cast<QPlainTextEdit *>(editor))
return false; // don't filter enter key events for QTextEdit
// We want the editor to be able to process the key press
// before committing the data (e.g. so it can do
// validation/fixup of the input).
#endif // QT_NO_TEXTEDIT
#ifndef QT_NO_LINEEDIT
if (QLineEdit *e = qobject_cast<QLineEdit*>(editor))
if (!e->hasAcceptableInput())
return false;
#endif // QT_NO_LINEEDIT
QMetaObject::invokeMethod(this, "_q_commitDataAndCloseEditor",
Qt::QueuedConnection, Q_ARG(QWidget*, editor));
return false;
case Qt::Key_Escape:
// don't commit data
emit closeEditor(editor, QAbstractItemDelegate::RevertModelCache);
break;
default:
return false;
}
if (editor->parentWidget())
editor->parentWidget()->setFocus();
return true;
} else if (event->type() == QEvent::FocusOut || (event->type() == QEvent::Hide && editor->isWindow())) {
//the Hide event will take care of he editors that are in fact complete dialogs
if (!editor->isActiveWindow() || (QApplication::focusWidget() != editor)) {
QWidget *w = QApplication::focusWidget();
while (w) { // don't worry about focus changes internally in the editor
if (w == editor)
return false;
w = w->parentWidget();
}
#ifndef QT_NO_DRAGANDDROP
// The window may lose focus during an drag operation.
// i.e when dragging involves the taskbar on Windows.
if (QDragManager::self() && QDragManager::self()->object != 0)
return false;
#endif
// Opening a modal dialog will start a new eventloop
// that will process the deleteLater event.
if (QApplication::activeModalWidget()
&& !QApplication::activeModalWidget()->isAncestorOf(editor)
&& qobject_cast<QDialog*>(QApplication::activeModalWidget()))
return false;
emit commitData(editor);
emit closeEditor(editor, NoHint);
}
} else if (event->type() == QEvent::ShortcutOverride) {
if (static_cast<QKeyEvent*>(event)->key() == Qt::Key_Escape) {
event->accept();
return true;
}
}
return false;
}
/*!
\reimp
*/
bool QItemDelegate::editorEvent(QEvent *event,
QAbstractItemModel *model,
const QStyleOptionViewItem &option,
const QModelIndex &index)
{
Q_ASSERT(event);
Q_ASSERT(model);
// make sure that the item is checkable
Qt::ItemFlags flags = model->flags(index);
if (!(flags & Qt::ItemIsUserCheckable) || !(option.state & QStyle::State_Enabled)
|| !(flags & Qt::ItemIsEnabled))
return false;
// make sure that we have a check state
QVariant value = index.data(Qt::CheckStateRole);
if (!value.isValid())
return false;
// make sure that we have the right event type
if ((event->type() == QEvent::MouseButtonRelease)
|| (event->type() == QEvent::MouseButtonDblClick)) {
QRect checkRect = check(option, option.rect, Qt::Checked);
QRect emptyRect;
doLayout(option, &checkRect, &emptyRect, &emptyRect, false);
QMouseEvent *me = static_cast<QMouseEvent*>(event);
if (me->button() != Qt::LeftButton || !checkRect.contains(me->pos()))
return false;
// eat the double click events inside the check rect
if (event->type() == QEvent::MouseButtonDblClick)
return true;
} else if (event->type() == QEvent::KeyPress) {
if (static_cast<QKeyEvent*>(event)->key() != Qt::Key_Space
&& static_cast<QKeyEvent*>(event)->key() != Qt::Key_Select)
return false;
} else {
return false;
}
Qt::CheckState state = (static_cast<Qt::CheckState>(value.toInt()) == Qt::Checked
? Qt::Unchecked : Qt::Checked);
return model->setData(index, state, Qt::CheckStateRole);
}
/*!
\internal
*/
QStyleOptionViewItem QItemDelegate::setOptions(const QModelIndex &index,
const QStyleOptionViewItem &option) const
{
QStyleOptionViewItem opt = option;
// set font
QVariant value = index.data(Qt::FontRole);
if (value.isValid()){
opt.font = qvariant_cast<QFont>(value).resolve(opt.font);
opt.fontMetrics = QFontMetrics(opt.font);
}
// set text alignment
value = index.data(Qt::TextAlignmentRole);
if (value.isValid())
opt.displayAlignment = Qt::Alignment(value.toInt());
// set foreground brush
value = index.data(Qt::ForegroundRole);
if (qVariantCanConvert<QBrush>(value))
opt.palette.setBrush(QPalette::Text, qvariant_cast<QBrush>(value));
return opt;
}
QT_END_NAMESPACE
#include "moc_qitemdelegate.cpp"
#endif // QT_NO_ITEMVIEWS
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