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[FEATURE] new custom widget — combobox with checkable items
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alexbruy committed Apr 8, 2017
1 parent 61137dc commit 638dbcad1c3e203c887a68fa1c94dc7f0875cbba
Showing with 413 additions and 0 deletions.
  1. +2 −0 src/gui/CMakeLists.txt
  2. +205 −0 src/gui/qgscheckablecombobox.cpp
  3. +206 −0 src/gui/qgscheckablecombobox.h
@@ -172,6 +172,7 @@ SET(QGIS_GUI_SRCS
qgsbrowsertreeview.cpp
qgsbusyindicatordialog.cpp
qgscharacterselectdialog.cpp
qgscheckablecombobox.cpp
qgscodeeditor.cpp
qgscodeeditorcss.cpp
qgscodeeditorhtml.cpp
@@ -329,6 +330,7 @@ SET(QGIS_GUI_MOC_HDRS
qgsbrowsertreeview.h
qgsbusyindicatordialog.h
qgscharacterselectdialog.h
qgscheckablecombobox.h
qgscodeeditor.h
qgscodeeditorcss.h
qgscodeeditorhtml.h
@@ -0,0 +1,205 @@
/***************************************************************************
qgscheckablecombobox.cpp
------------------------
begin : March 21, 2017
copyright : (C) 2017 by Alexander Bruy
email : alexander dot bruy at gmail dot com
***************************************************************************/

/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/

#include "qgscheckablecombobox.h"

#include <QLineEdit>
#include <QAbstractItemView>


QgsCheckableItemModel::QgsCheckableItemModel( QObject *parent )
: QStandardItemModel( 0, 1, parent )
{
}

Qt::ItemFlags QgsCheckableItemModel::flags( const QModelIndex &index ) const
{
return QStandardItemModel::flags( index ) | Qt::ItemIsUserCheckable;
}

QVariant QgsCheckableItemModel::data( const QModelIndex &index, int role ) const
{
QVariant value = QStandardItemModel::data( index, role );

if ( index.isValid() && role == Qt::CheckStateRole && !value.isValid() )
{
value = Qt::Unchecked;
}

return value;
}

bool QgsCheckableItemModel::setData( const QModelIndex &index, const QVariant &value, int role )
{
bool ok = QStandardItemModel::setData( index, value, role );

if ( ok && role == Qt::CheckStateRole )
{
emit dataChanged( index, index );
emit itemCheckStateChanged();
}

return ok;
}


QgsCheckBoxDelegate::QgsCheckBoxDelegate( QObject *parent )
: QStyledItemDelegate( parent )
{
}

void QgsCheckBoxDelegate::paint( QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index ) const
{
QStyleOptionViewItem &nonConstOpt = const_cast<QStyleOptionViewItem &>( option );
nonConstOpt.showDecorationSelected = false;
QStyledItemDelegate::paint( painter, nonConstOpt, index );
}


QgsCheckableComboBox::QgsCheckableComboBox( QWidget *parent )
: QComboBox( parent )
, mSeparator( ", " )
, mDefaultText( "" )
{
setModel( new QgsCheckableItemModel( this ) );
setItemDelegate( new QgsCheckBoxDelegate( this ) );

QLineEdit *lineEdit = new QLineEdit( this );
lineEdit->setReadOnly( true );
setLineEdit( lineEdit );

QgsCheckableItemModel *myModel = qobject_cast<QgsCheckableItemModel *>( model() );
connect( myModel, &QgsCheckableItemModel::itemCheckStateChanged, this, &QgsCheckableComboBox::updateCheckedItems );
connect( model(), &QStandardItemModel::rowsInserted, this, [ = ]( const QModelIndex &, int, int ) { updateCheckedItems(); } );
connect( model(), &QStandardItemModel::rowsRemoved, this, [ = ]( const QModelIndex &, int, int ) { updateCheckedItems(); } );

connect( this, static_cast< void ( QComboBox::* )( int ) >( &QComboBox::activated ), this, &QgsCheckableComboBox::toggleItemCheckState );
}

QString QgsCheckableComboBox::separator() const
{
return mSeparator;
}

void QgsCheckableComboBox::setSeparator( const QString &separator )
{
if ( mSeparator != separator )
{
mSeparator = separator;
updateDisplayText();
}
}

QString QgsCheckableComboBox::defaultText() const
{
return mDefaultText;
}

void QgsCheckableComboBox::setDefaultText( const QString &text )
{
if ( mDefaultText != text )
{
mDefaultText = text;
updateDisplayText();
}
}

QStringList QgsCheckableComboBox::checkedItems() const
{
QStringList items;

if ( model() )
{
QModelIndex index = model()->index( 0, modelColumn(), rootModelIndex() );
QModelIndexList indexes = model()->match( index, Qt::CheckStateRole, Qt::Checked, -1, Qt::MatchExactly );
Q_FOREACH ( const QModelIndex &index, indexes )
{
items += index.data().toString();
}
}

return items;
}

Qt::CheckState QgsCheckableComboBox::itemCheckState( int index ) const
{
return static_cast<Qt::CheckState>( itemData( index, Qt::CheckStateRole ).toInt() );
}

void QgsCheckableComboBox::setItemCheckState( int index, Qt::CheckState state )
{
setItemData( index, state, Qt::CheckStateRole );
}

void QgsCheckableComboBox::toggleItemCheckState( int index )
{
QVariant value = itemData( index, Qt::CheckStateRole );
if ( value.isValid() )
{
Qt::CheckState state = static_cast<Qt::CheckState>( value.toInt() );
setItemData( index, ( state == Qt::Unchecked ? Qt::Checked : Qt::Unchecked ), Qt::CheckStateRole );
}
}

void QgsCheckableComboBox::hidePopup()
{
if ( !view()->underMouse() )
{
QComboBox::hidePopup();
}
}

void QgsCheckableComboBox::setCheckedItems( const QStringList &items )
{
Q_FOREACH ( const QString &text, items )
{
const int index = findText( text );
setItemCheckState( index, index != -1 ? Qt::Checked : Qt::Unchecked );
}
}

void QgsCheckableComboBox::resizeEvent( QResizeEvent *event )
{
QComboBox::resizeEvent( event );
updateDisplayText();
}

void QgsCheckableComboBox::updateCheckedItems()
{
QStringList items = checkedItems();
updateDisplayText();
emit checkedItemsChanged( items );
}

void QgsCheckableComboBox::updateDisplayText()
{
QString text;
QStringList items = checkedItems();
if ( items.isEmpty() )
{
text = mDefaultText;
}
else
{
text = items.join( mSeparator );
}

QRect rect = lineEdit()->rect();
QFontMetrics fontMetrics( font() );
text = fontMetrics.elidedText( text, Qt::ElideRight, rect.width() );
setEditText( text );
}
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