From f529fda278eaed768b8ced5e71cc7d3edf045d6b Mon Sep 17 00:00:00 2001
From: Clemens Manert <Clemens@Manert.de>
Date: Mon, 4 Apr 2022 00:57:02 +0200
Subject: [PATCH] Add checkbox-groups

---
 src/controls/QskCheckBox.cpp | 94 +++++++++++++++++++++++++++++++++++-
 src/controls/QskCheckBox.h   |  6 +++
 2 files changed, 98 insertions(+), 2 deletions(-)

diff --git a/src/controls/QskCheckBox.cpp b/src/controls/QskCheckBox.cpp
index 6789900f..7251db0a 100644
--- a/src/controls/QskCheckBox.cpp
+++ b/src/controls/QskCheckBox.cpp
@@ -11,6 +11,8 @@ QSK_SYSTEM_STATE( QskCheckBox, PartiallyChecked, QskAspect::LastUserState << 2 )
 
 struct QskCheckBox::PrivateData
 {
+    QSet< QskAbstractButton* > group;
+    int groupItemsChecked;
     Qt::CheckState checkState;
     bool checkStateChanging : 1;
     bool toggleChanging : 1;
@@ -18,8 +20,9 @@ struct QskCheckBox::PrivateData
 };
 
 QskCheckBox::QskCheckBox( QQuickItem* parent )
-    : Inherited( parent ), m_data( new PrivateData{ Qt::CheckState::Unchecked,
-        false, false, false } ) {
+    : Inherited( parent )
+    , m_data( new PrivateData { QSet< QskAbstractButton* >(), 0,
+        Qt::Unchecked, false, false, false } ) {
     setAcceptHoverEvents( true );
     initSizePolicy( QskSizePolicy::Fixed, QskSizePolicy::Fixed );
 
@@ -32,6 +35,7 @@ QskCheckBox::QskCheckBox( QQuickItem* parent )
 
 QskCheckBox::~QskCheckBox()
 {
+    Q_EMIT removeFromAllGroupsRequested();
 }
 
 bool QskCheckBox::isCheckable() const
@@ -92,4 +96,90 @@ void QskCheckBox::setTriState( bool triState )
     }
 }
 
+void QskCheckBox::updated()
+{
+    if( m_data->toggleChanging )
+    {
+        return;
+    }
+
+    auto& groupItemsChecked = m_data->groupItemsChecked;
+
+    if( groupItemsChecked == m_data->group.size() )
+    {
+        this->setCheckState( Qt::CheckState::Checked );
+    }
+    else if ( groupItemsChecked == 0 )
+    {
+        this->setCheckState( Qt::CheckState::Unchecked );
+    }
+    else
+    {
+        this->setCheckState( Qt::CheckState::PartiallyChecked );
+    }
+}
+
+void QskCheckBox::addToGroup( QskCheckBox* groupItem ) {
+    if( m_data->group.contains( groupItem ) )
+    {
+        return;
+    }
+
+    m_data->group.insert( groupItem );
+
+    if( groupItem->checkState() == Qt::CheckState::Checked )
+    {
+        m_data->groupItemsChecked += 1;
+    }
+
+    updated();
+
+    connect( this, &QskCheckBox::checkStateChanged,
+        groupItem, [ this, groupItem ] ( Qt::CheckState checkState )
+    {
+        if( checkState == Qt::Checked )
+        {
+            m_data->toggleChanging = true;
+            groupItem->setChecked( true );
+            m_data->groupItemsChecked = m_data->group.size();
+            m_data->toggleChanging = false;
+        }
+        else if ( checkState == Qt::Unchecked )
+        {
+            m_data->toggleChanging = true;
+            groupItem->setChecked( false );
+            m_data->groupItemsChecked = 0;
+            m_data->toggleChanging = false;
+        }
+    } );
+
+    connect( groupItem, &QskAbstractButton::toggled,
+        this, [ this, groupItem ] ( bool toggled )
+    {
+        auto& groupItemsChecked = m_data->groupItemsChecked;
+        groupItemsChecked += toggled ? 1 : -1;
+        updated();
+    } );
+
+    connect( groupItem, &QskCheckBox::removeFromAllGroupsRequested,
+        this, [ this, groupItem ] (  )
+    {
+        removeFromGroup( groupItem );
+    } );
+}
+
+void QskCheckBox::removeFromGroup( QskCheckBox* groupItem ) {
+    if( !m_data->group.remove( groupItem ) )
+    {
+        return;
+    }
+
+    if( groupItem->checkState() == Qt::CheckState::Checked )
+    {
+        m_data->groupItemsChecked -= 1;
+    }
+
+    updated();
+}
+
 #include "moc_QskCheckBox.cpp"
diff --git a/src/controls/QskCheckBox.h b/src/controls/QskCheckBox.h
index 87f39e7a..eed70a7b 100644
--- a/src/controls/QskCheckBox.h
+++ b/src/controls/QskCheckBox.h
@@ -25,6 +25,9 @@ class QSK_EXPORT QskCheckBox : public QskAbstractButton
     bool isTriState() const;
     bool isCheckable() const override final;
 
+    void addToGroup( QskCheckBox* groupItem );
+    void removeFromGroup( QskCheckBox* groupItem );
+
   public Q_SLOTS:
     void setCheckState( Qt::CheckState );
     void setTriState( bool triState = true );
@@ -32,8 +35,11 @@ class QSK_EXPORT QskCheckBox : public QskAbstractButton
   Q_SIGNALS:
     void checkStateChanged( Qt::CheckState );
     void isTriStateChanged( bool );
+    void removeFromAllGroupsRequested();
+
   private:
     void setCheckStateInternal( Qt::CheckState );
+    void updated();
 
     struct PrivateData;
     std::unique_ptr< PrivateData > m_data;