jx_layout_editor: changing partition sizes should be undoable

Author: jafl

libjcore/code/JCoreLibVersion.h

@@ -68,6 +68,8 @@ static const char* kCurrentJCoreLibVersionStr = "4.1.0";
 //	JStyledText:
 //		Fixed performance issues introduced in 4.0.0 caused by having multiple,
 //			active FontIterators during some operations.
+//	JPartition:
+//		Added BeginResizeCompartments & EndResizeCompartments messages.
 
 // version 4.0.0:
 //	*** Upgraded to C++20

libjcore/code/JPartition.cpp

@@ -32,9 +32,9 @@
 		DeleteCompartmentObject
 			Delete the specified compartment object.
 
-	BASE CLASS = none
+	BASE CLASS = virtual JBroadcaster
 
-	Copyright (C) 1996 by John Lindal.
+	Copyright (C) 1996-2024 by John Lindal.
 
  ******************************************************************************/
 
@@ -50,6 +50,11 @@ const JUtf8Byte kGeometryDataEndDelimiter      = '\1';
 
 	// version 1: removed elastic index and min sizes
 
+// JBroadcaster message types
+
+const JUtf8Byte* JPartition::kBeginResizeCompartments = "BeginResizeCompartments::JPartition";
+const JUtf8Byte* JPartition::kEndResizeCompartments   = "EndResizeCompartments::JPartition";
+
 /******************************************************************************
  Constructor (protected)
 
@@ -77,11 +82,8 @@ JPartition::JPartition
 	assert( compartmentCount == minSizes.GetItemCount() );
 	assert( elasticIndex <= compartmentCount );
 
-	itsSizes = jnew JArray<JCoordinate>(sizes);
-	assert( itsSizes != nullptr );
-
+	itsSizes    = jnew JArray<JCoordinate>(sizes);
 	itsMinSizes = jnew JArray<JCoordinate>(minSizes);
-	assert( itsMinSizes != nullptr );
 }
 
 /******************************************************************************
@@ -496,10 +498,12 @@ JPartition::PrepareToDrag
 
 	assert( itsDragIndex > 0 );
 	assert( *maxDragCoord >= *minDragCoord );
+
+	Broadcast(BeginResizeCompartments());
 }
 
 /******************************************************************************
- AdjustCompartmentsAfterDrag
+ AdjustCompartmentsAfterDrag (protected)
 
 	Shift space from one compartment to the other.
 
@@ -517,10 +521,12 @@ JPartition::AdjustCompartmentsAfterDrag
 						 itsDragMax - coord - kDragRegionHalfSize - 1);
 
 	UpdateCompartmentSizes();
+
+	Broadcast(EndResizeCompartments());
 }
 
 /******************************************************************************
- PrepareToDragAll
+ PrepareToDragAll (protected)
 
 	Prepare to drag dividing line between two adjacent compartments and
 	allow other compartments to shrink to get more space.
@@ -568,10 +574,12 @@ JIndex i;
 
 	*minDragCoord = itsDragMin;
 	*maxDragCoord = itsDragMax;
+
+	Broadcast(BeginResizeCompartments());
 }
 
 /******************************************************************************
- AdjustCompartmentsAfterDragAll
+ AdjustCompartmentsAfterDragAll (protected)
 
 	Expand one compartment at the expense of all the others.
 
@@ -610,7 +618,7 @@ JIndex i;
 			itsSizes->SetItem(i, newSizes.GetItem(i));
 		}
 		itsSizes->SetItem(itsDragIndex+1,
-							 itsSizes->GetItem(itsDragIndex+1) + reqSize);
+						  itsSizes->GetItem(itsDragIndex+1) + reqSize);
 
 		UpdateCompartmentSizes();
 	}
@@ -637,14 +645,16 @@ JIndex i;
 		assert( ok );
 
 		itsSizes->SetItem(itsDragIndex,
-							 itsSizes->GetItem(itsDragIndex) + reqSize);
+						  itsSizes->GetItem(itsDragIndex) + reqSize);
 		for (i=itsDragIndex+1; i<=compartmentCount; i++)
 		{
 			itsSizes->SetItem(i, newSizes.GetItem(i-itsDragIndex));
 		}
 
 		UpdateCompartmentSizes();
 	}
+
+	Broadcast(EndResizeCompartments());
 }
 
 /******************************************************************************
@@ -673,7 +683,7 @@ JPartition::PTBoundsChanged()
 		{
 			JCoordinate trueDelta;
 			const bool ok = CreateSpace(*itsSizes, *itsMinSizes, itsElasticIndex,
-											-delta, -delta, &newSizes, &trueDelta);
+										-delta, -delta, &newSizes, &trueDelta);
 			assert( ok );
 		}
 		*itsSizes = newSizes;

libjcore/code/JPartition.h

@@ -12,7 +12,7 @@
 
 #include "JArray.h"
 
-class JPartition
+class JPartition : virtual public JBroadcaster
 {
 public:
 
@@ -104,6 +104,33 @@ class JPartition
 
 	JPartition(const JPartition&) = delete;
 	JPartition& operator=(const JPartition&) = delete;
+
+public:
+
+	// JBroadcaster messages
+
+	static const JUtf8Byte* kBeginResizeCompartments;
+	static const JUtf8Byte* kEndResizeCompartments;
+
+	class BeginResizeCompartments : public JBroadcaster::Message
+	{
+	public:
+
+		BeginResizeCompartments()
+			:
+			JBroadcaster::Message(kBeginResizeCompartments)
+			{ };
+	};
+
+	class EndResizeCompartments : public JBroadcaster::Message
+	{
+	public:
+
+		EndResizeCompartments()
+			:
+			JBroadcaster::Message(kEndResizeCompartments)
+			{ };
+	};
 };
 
 /******************************************************************************

todo-jxlayout

@@ -22,7 +22,8 @@ class LayoutUndo : public JUndo
 		kUnclassifiedType,
 		kWindowResizeType,
 		kArrowType,
-		kDragResizeType
+		kDragResizeType,
+		kResizePartitionType
 	};
 
 public:

tools/jx_layout_editor/code/LayoutUndo.h

@@ -53,6 +53,8 @@ Partition::Partition
 
 	InsertLayoutContainer(1, itsPartition->GetCompartment(1));
 	InsertLayoutContainer(2, itsPartition->GetCompartment(2));
+
+	PartitionX();
 }
 
 Partition::Partition
@@ -103,6 +105,29 @@ Partition::Partition
 	{
 		InsertLayoutContainer(i, itsPartition->GetCompartment(i));
 	}
+
+	PartitionX();
+}
+
+// private
+
+void
+Partition::PartitionX()
+{
+	itsUndo = nullptr;
+
+	ListenTo(itsPartition, std::function([this](const JPartition::BeginResizeCompartments&)
+	{
+		assert( itsUndo == nullptr );
+		itsUndo = jnew LayoutUndo(GetParentContainer()->GetDocument(), LayoutUndo::kResizePartitionType);
+	}));
+
+	ListenTo(itsPartition, std::function([this](const JPartition::EndResizeCompartments&)
+	{
+		assert( itsUndo != nullptr );
+		GetParentContainer()->NewUndo(itsUndo);
+		itsUndo = nullptr;
+	}));
 }
 
 /******************************************************************************
@@ -112,6 +137,7 @@ Partition::Partition
 
 Partition::~Partition()
 {
+	jdelete itsUndo;
 }
 
 /******************************************************************************

tools/jx_layout_editor/code/Partition.cpp

@@ -12,6 +12,7 @@
 
 class JXPartition;
 class PartitionPanel;
+class LayoutUndo;
 
 class Partition : public MultiContainerWidget
 {
@@ -61,6 +62,11 @@ class Partition : public MultiContainerWidget
 	Type			itsType;
 	JXPartition*	itsPartition;
 	PartitionPanel*	itsPanel;
+	LayoutUndo*		itsUndo;
+
+private:
+
+	void	PartitionX();
 };
 
 #endif