Inspector direct editing

Changes.md

@@ -1,6 +1,11 @@
 1.5.x.x (relative to 1.5.5.0)
 =======
 
+Features
+--------
+
+- AttributeEditor, LightEditor, RenderPassEditor : Added drag and drop editing. Edits can be created or updated by dropping a value into a cell. Cells representing a set expression or string array can be modified by holding <kbd>Shift</kbd> to append to an existing edit, or <kbd>Control</kbd> may be held to remove from an existing edit.
+
 Fixes
 -----
 
@@ -12,7 +17,7 @@ API
 - SceneAlgo :
   - Added `parallelReduceLocations()` for implementing functions that need to combine results while traversing a ScenePlug.
   - Added `hierarchyHash()` for hashing all children of a scene location.
-
+- PathColumn : Added `dragEnterSignal()`, `dragMoveSignal()`, `dragLeaveSignal()` and `dropSignal()`.
 
 1.5.5.0 (relative to 1.5.4.1)
 =======

include/GafferSceneUI/Private/AttributeInspector.h

@@ -67,7 +67,7 @@ class GAFFERSCENEUI_API AttributeInspector : public Inspector
 		IECore::ConstObjectPtr value( const GafferScene::SceneAlgo::History *history) const override;
 		IECore::ConstObjectPtr fallbackValue( const GafferScene::SceneAlgo::History *history, std::string &description ) const override;
 		Gaffer::ValuePlugPtr source( const GafferScene::SceneAlgo::History *history, std::string &editWarning ) const override;
-		EditFunctionOrFailure editFunction( Gaffer::EditScope *scope, const GafferScene::SceneAlgo::History *history) const override;
+		AcquireEditFunctionOrFailure acquireEditFunction( Gaffer::EditScope *scope, const GafferScene::SceneAlgo::History *history ) const override;
 
 		bool attributeExists() const;
 

include/GafferSceneUI/Private/Inspector.h

@@ -170,8 +170,8 @@ class GAFFERSCENEUI_API Inspector : public IECore::RefCounted, public Gaffer::Si
 		/// history class?
 		virtual Gaffer::ValuePlugPtr source( const GafferScene::SceneAlgo::History *history, std::string &editWarning ) const;
 
-		using EditFunction = std::function<Gaffer::ValuePlugPtr ( bool createIfNecessary )>;
-		using EditFunctionOrFailure = std::variant<EditFunction, std::string>;
+		using AcquireEditFunction = std::function<Gaffer::ValuePlugPtr ( bool createIfNecessary )>;
+		using AcquireEditFunctionOrFailure = std::variant<AcquireEditFunction, std::string>;
 		/// Should be implemented to return a function that will acquire
 		/// an edit from the EditScope at the specified point in the history.
 		/// If this is not possible, should return an error explaining why
@@ -181,7 +181,7 @@ class GAFFERSCENEUI_API Inspector : public IECore::RefCounted, public Gaffer::Si
 		/// > Note : Where an EditScope already contains an edit, it is expected
 		/// > that this will be dealt with in `source()`, returning a result
 		/// > that edits the processor itself.
-		virtual EditFunctionOrFailure editFunction( Gaffer::EditScope *editScope, const GafferScene::SceneAlgo::History *history ) const;
+		virtual AcquireEditFunctionOrFailure acquireEditFunction( Gaffer::EditScope *editScope, const GafferScene::SceneAlgo::History *history ) const;
 
 		using DisableEditFunction = std::function<void ()>;
 		using DisableEditFunctionOrFailure = std::variant<DisableEditFunction, std::string>;
@@ -191,6 +191,18 @@ class GAFFERSCENEUI_API Inspector : public IECore::RefCounted, public Gaffer::Si
 		/// Called with `history->context` as the current context.
 		virtual DisableEditFunctionOrFailure disableEditFunction( Gaffer::ValuePlug *plug, const GafferScene::SceneAlgo::History *history ) const;
 
+		using CanEditFunction = std::function<bool ( const Gaffer::ValuePlug *plug, const IECore::Object *value, std::string &failureReason )>;
+		/// Can be implemented to return a function that will return whether
+		/// `value` can be set on `plug`. If `value` cannot be set on `plug`,
+		/// `failureReason` should provide the reason why.
+		virtual CanEditFunction canEditFunction( const GafferScene::SceneAlgo::History *history ) const;
+
+		using EditFunction = std::function<void ( Gaffer::ValuePlug *plug, const IECore::Object *value )>;
+		/// Can be implemented to return a function that will directly
+		/// edit `plug` to set `value`. Called with `history->context` as the
+		/// current context.
+		virtual EditFunction editFunction( const GafferScene::SceneAlgo::History *history ) const;
+
 	protected :
 
 		Gaffer::EditScope *targetEditScope() const;
@@ -340,8 +352,9 @@ class GAFFERSCENEUI_API Inspector::Result : public IECore::RefCounted
 		/// and `false` otherwise.
 		bool editable() const;
 		/// If `editable()` returns false, returns the reason why.
-		/// This should be displayed to the user.
-		std::string nonEditableReason() const;
+		/// If `canEdit( value )` returns false, `nonEditableReason( value )`
+		/// returns the reason why. This should be displayed to the user.
+		std::string nonEditableReason( const IECore::Object *value = nullptr ) const;
 
 		/// Returns a plug that can be used to edit the property
 		/// represented by this inspector, creating it if necessary.
@@ -361,6 +374,14 @@ class GAFFERSCENEUI_API Inspector::Result : public IECore::RefCounted
 		/// `!canDisableEdit()`
 		void disableEdit() const;
 
+		/// Returns whether a direct edit can be made with the
+		/// specified value.
+		bool canEdit( const IECore::Object *value, std::string &failureReason ) const;
+		/// Applies a direct edit with the specified value.
+		/// Calls `acquireEdit()` to ensure a plug exists to
+		/// receive the value.
+		void edit( const IECore::Object *value ) const;
+
 	private :
 
 		Result( const IECore::ConstObjectPtr &value, const Gaffer::EditScopePtr &editScope );
@@ -376,10 +397,11 @@ class GAFFERSCENEUI_API Inspector::Result : public IECore::RefCounted
 
 		struct Editors
 		{
-			/// \todo Rename to `acquireEditFunction`?
-			EditFunctionOrFailure editFunction;
+			AcquireEditFunctionOrFailure acquireEditFunction;
 			std::string editWarning;
 			DisableEditFunctionOrFailure disableEditFunction;
+			CanEditFunction canEditFunction;
+			EditFunction editFunction;
 		};
 
 		std::optional<Editors> m_editors;

include/GafferSceneUI/Private/OptionInspector.h

@@ -65,7 +65,7 @@ class GAFFERSCENEUI_API OptionInspector : public Inspector
 		IECore::ConstObjectPtr value( const GafferScene::SceneAlgo::History *history ) const override;
 		IECore::ConstObjectPtr fallbackValue( const GafferScene::SceneAlgo::History *history, std::string &description ) const override;
 		Gaffer::ValuePlugPtr source( const GafferScene::SceneAlgo::History *history, std::string &editWarning ) const override;
-		EditFunctionOrFailure editFunction( Gaffer::EditScope *scope, const GafferScene::SceneAlgo::History *history ) const override;
+		AcquireEditFunctionOrFailure acquireEditFunction( Gaffer::EditScope *scope, const GafferScene::SceneAlgo::History *history ) const override;
 
 	private :
 

include/GafferSceneUI/Private/ParameterInspector.h

@@ -69,7 +69,7 @@ class GAFFERSCENEUI_API ParameterInspector : public AttributeInspector
 		IECore::ConstObjectPtr value( const GafferScene::SceneAlgo::History *history ) const override;
 		IECore::ConstObjectPtr fallbackValue( const GafferScene::SceneAlgo::History *history, std::string &description ) const override;
 		Gaffer::ValuePlugPtr source( const GafferScene::SceneAlgo::History *history, std::string &editWarning ) const override;
-		EditFunctionOrFailure editFunction( Gaffer::EditScope *editScope, const GafferScene::SceneAlgo::History *history ) const override;
+		AcquireEditFunctionOrFailure acquireEditFunction( Gaffer::EditScope *editScope, const GafferScene::SceneAlgo::History *history ) const override;
 
 		const IECoreScene::ShaderNetwork::Parameter m_parameter;
 

include/GafferSceneUI/Private/SetMembershipInspector.h

@@ -60,15 +60,6 @@ class GAFFERSCENEUI_API SetMembershipInspector : public Inspector
 			IECore::InternedString setName
 		);
 
-		/// Convenience method to acquire an edit from `inspection` and
-		/// edit the set membership to include or exclude `path`. Returns true
-		/// if an edit was made, false otherwise.
-		bool editSetMembership(
-			const Result *inspection,
-			const GafferScene::ScenePlug::ScenePath &path,
-			GafferScene::EditScopeAlgo::SetMembership setMembership
-		) const;
-
 		IE_CORE_DECLAREMEMBERPTR( SetMembershipInspector );
 
 	protected :
@@ -81,8 +72,10 @@ class GAFFERSCENEUI_API SetMembershipInspector : public Inspector
 		/// appropriate row of a set membership processor spreadsheet or `nullptr` if none of
 		/// those are found.
 		Gaffer::ValuePlugPtr source( const GafferScene::SceneAlgo::History *history, std::string &editWarning ) const override;
-		EditFunctionOrFailure editFunction( Gaffer::EditScope *scope, const GafferScene::SceneAlgo::History *history ) const override;
+		AcquireEditFunctionOrFailure acquireEditFunction( Gaffer::EditScope *scope, const GafferScene::SceneAlgo::History *history ) const override;
 		DisableEditFunctionOrFailure disableEditFunction( Gaffer::ValuePlug *plug, const GafferScene::SceneAlgo::History *history ) const override;
+		CanEditFunction canEditFunction( const GafferScene::SceneAlgo::History *history ) const override;
+		EditFunction editFunction( const GafferScene::SceneAlgo::History *history ) const override;
 
 	private :
 

include/GafferUI/PathColumn.h

@@ -37,8 +37,10 @@
 #pragma once
 
 #include "GafferUI/ButtonEvent.h"
+#include "GafferUI/DragDropEvent.h"
 #include "GafferUI/EventSignalCombiner.h"
 #include "GafferUI/Export.h"
+#include "GafferUI/Gadget.h"
 #include "GafferUI/KeyEvent.h"
 
 #include "Gaffer/Path.h"
@@ -76,6 +78,7 @@ class GAFFERUI_API PathColumn : public IECore::RefCounted, public Gaffer::Signal
 		};
 
 		explicit PathColumn( SizeMode sizeMode = Default );
+		~PathColumn();
 
 		/// Returns the current column size mode.
 		SizeMode getSizeMode() const;
@@ -172,6 +175,12 @@ class GAFFERUI_API PathColumn : public IECore::RefCounted, public Gaffer::Signal
 		KeySignal &keyPressSignal();
 		KeySignal &keyReleaseSignal();
 
+		using DragDropSignal = Gaffer::Signals::Signal<bool ( PathColumn &column, Gaffer::Path &path, PathListingWidget &widget, const DragDropEvent &event ), EventSignalCombiner<bool>>;
+		DragDropSignal &dragEnterSignal();
+		DragDropSignal &dragMoveSignal();
+		DragDropSignal &dragLeaveSignal();
+		DragDropSignal &dropSignal();
+
 		/// Creation
 		/// ========