Listen existing command event in an editor plugin?

Development Programming & Scripting C++
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1

I am working on an editor plugin with a custom EdMode.

I would like to do something when the user performs an action (in my case: select the translate tool, with the UI button or the keyboard shortcut).

How can I access the command (for example the SelectTranslateTool command)?

How can I react to event triggered by this command?

2

ok, it seems the line 228 of SEditorViewport.cpp will help me:

CommandListRef.MapAction(
	Commands.TranslateMode,
	FExecuteAction::CreateSP( ClientRef, &FEditorViewportClient::SetWidgetMode, FWidget::WM_Translate ),
	FCanExecuteAction::CreateSP( ClientRef, &FEditorViewportClient::CanSetWidgetMode, FWidget::WM_Translate ),
	FIsActionChecked::CreateSP( this, &SEditorViewport::IsWidgetModeActive, FWidget::WM_Translate ) 
	);
3

I don’t know how to access the EditorViewport :frowning:

4

It took me 2 hours to make this code:

FLevelEditorModule& LevelEditor = FModuleManager::GetModuleChecked<FLevelEditorModule>( TEXT("LevelEditor") );
TWeakPtr<SLevelEditor> LevelEditorInstance = LevelEditor.GetLevelEditorInstance();
if(LevelEditorInstance.IsValid())
{
    TSharedPtr<SLevelEditor> LevelEditorInstancePtr = LevelEditorInstance.Pin();
    TSharedPtr<FUICommandList> LevelEditorCommands = LevelEditorInstancePtr->GetLevelEditorActions();
    
    const FEditorViewportCommands& Commands = FEditorViewportCommands::Get();
    LevelEditorCommands->MapAction(Commands.TranslateMode, FExecuteAction::CreateUObject( APB::Instance, &APB::SetWidgetMode, 0 ));
    LevelEditorCommands->MapAction(Commands.RotateMode, FExecuteAction::CreateUObject( APB::Instance, &APB::SetWidgetMode, 1 ));
    LevelEditorCommands->MapAction(Commands.ScaleMode, FExecuteAction::CreateUObject( APB::Instance, &APB::SetWidgetMode, 2 ));
}

and it does not work, it overrides the commands instead of extending them.

It’s so hard to find documentation and help in UE.