Fix remaining flickering for #9841.

- Revert hrev45802. However, implement the same essential logic in
  the TeamWindow itself, and have it guard the StackTraceView,
  VariablesView, and step control buttons. This fixes flickering
  in between short steps since it prevents the intermediate clear
  from happening unnecessarily.
- Implement appropriate guards for the interim wait state.

src/apps/debugger/user_interface/gui/team_window/StackTraceView.cpp

@@ -12,7 +12,6 @@
 #include <new>
 
 #include <ControlLook.h>
-#include <MessageRunner.h>
 #include <Window.h>
 
 #include "table/TableColumns.h"
@@ -25,11 +24,6 @@
 #include "UiUtils.h"
 
 
-enum {
-	MSG_CLEAR_STACK_TRACE 	= 'clst'
-};
-
-
 // #pragma mark - FramesTableModel
 
 
@@ -114,7 +108,7 @@ StackTraceView::StackTraceView(Listener* listener)
 	fStackTrace(NULL),
 	fFramesTable(NULL),
 	fFramesTableModel(NULL),
-	fTraceUpdateRunner(NULL),
+	fTraceClearPending(false),
 	fListener(listener)
 {
 	SetName("Stack Trace");
@@ -155,23 +149,19 @@ StackTraceView::UnsetListener()
 void
 StackTraceView::SetStackTrace(StackTrace* stackTrace)
 {
+	fTraceClearPending = false;
 	if (stackTrace == fStackTrace)
 		return;
 
-	if (stackTrace == NULL) {
+	if (fStackTrace != NULL)
-		if (fTraceUpdateRunner != NULL)
+		fStackTrace->ReleaseReference();
-			return;
 
-		BMessage message(MSG_CLEAR_STACK_TRACE);
+	fStackTrace = stackTrace;
-		fTraceUpdateRunner = new(std::nothrow) BMessageRunner(this,
-			message, 250000, 1);
-		if (fTraceUpdateRunner != NULL
-			&& fTraceUpdateRunner->InitCheck() == B_OK) {
-			return;
-		}
-	}
 
-	_SetStackTrace(stackTrace);
+	if (fStackTrace != NULL)
+		fStackTrace->AcquireReference();
+
+	fFramesTableModel->SetStackTrace(fStackTrace);
 }
 
 
@@ -218,38 +208,18 @@ StackTraceView::SaveSettings(BMessage& settings)
 
 
 void
-StackTraceView::MessageReceived(BMessage* message)
+StackTraceView::SetStackTraceClearPending()
 {
-	switch (message->what) {
+	fTraceClearPending = true;
-		case MSG_CLEAR_STACK_TRACE:
-		{
-			if (fTraceUpdateRunner != NULL)
-				_SetStackTrace(NULL);
-			break;
-		}
-		default:
-		{
-			BGroupView::MessageReceived(message);
-			break;
-		}
-	}
 }
 
 
 void
 StackTraceView::TableSelectionChanged(Table* table)
 {
-	if (fListener == NULL)
+	if (fListener == NULL || fTraceClearPending)
 		return;
 
-	if (fTraceUpdateRunner != NULL) {
-		// in this instance, ignore the selection change, since the
-		// stack trace for which a selection change was requested will
-		// momentarily be invalid. This case is quite unlikely to be hit
-		// anyways.
-		return;
-	}
-
 	StackFrame* frame
 		= fFramesTableModel->FrameAt(table->SelectionModel()->RowAt(0));
 
@@ -283,24 +253,6 @@ StackTraceView::_Init()
 }
 
 
-void
-StackTraceView::_SetStackTrace(StackTrace* stackTrace)
-{
-	delete fTraceUpdateRunner;
-	fTraceUpdateRunner = NULL;
-
-	if (fStackTrace != NULL)
-		fStackTrace->ReleaseReference();
-
-	fStackTrace = stackTrace;
-
-	if (fStackTrace != NULL)
-		fStackTrace->AcquireReference();
-
-	fFramesTableModel->SetStackTrace(fStackTrace);
-}
-
-
 // #pragma mark - Listener
 
 

src/apps/debugger/user_interface/gui/team_window/StackTraceView.h

@@ -11,7 +11,6 @@
 #include "Team.h"
 
 
-class BMessageRunner;
 class StackFrame;
 
 
@@ -34,7 +33,7 @@ public:
 			void				LoadSettings(const BMessage& settings);
 			status_t			SaveSettings(BMessage& settings);
 
-	virtual	void				MessageReceived(BMessage* message);
+			void				SetStackTraceClearPending();
 
 private:
 			class FramesTableModel;
@@ -45,13 +44,11 @@ private:
 
 			void				_Init();
 
-			void				_SetStackTrace(StackTrace* stackTrace);
-
 private:
 			StackTrace*			fStackTrace;
 			Table*				fFramesTable;
 			FramesTableModel*	fFramesTableModel;
-			BMessageRunner*		fTraceUpdateRunner;
+			bool				fTraceClearPending;
 			Listener*			fListener;
 };
 

src/apps/debugger/user_interface/gui/team_window/TeamWindow.cpp

@@ -19,6 +19,7 @@
 #include <MenuItem.h>
 #include <Message.h>
 #include <MessageFilter.h>
+#include <MessageRunner.h>
 #include <Path.h>
 #include <StringView.h>
 #include <TabView.h>
@@ -61,7 +62,8 @@ enum {
 enum {
 	MSG_CHOOSE_DEBUG_REPORT_LOCATION = 'ccrl',
 	MSG_DEBUG_REPORT_SAVED = 'drsa',
-	MSG_LOCATE_SOURCE_IF_NEEDED = 'lsin'
+	MSG_LOCATE_SOURCE_IF_NEEDED = 'lsin',
+	MSG_CLEAR_STACK_TRACE 	= 'clst'
 };
 
 
@@ -103,6 +105,7 @@ TeamWindow::TeamWindow(::Team* team, UserInterfaceListener* listener)
 	fActiveSourceCode(NULL),
 	fActiveSourceObject(ACTIVE_SOURCE_NONE),
 	fListener(listener),
+	fTraceUpdateRunner(NULL),
 	fTabView(NULL),
 	fLocalsTabView(NULL),
 	fThreadListView(NULL),
@@ -185,7 +188,7 @@ TeamWindow::DispatchMessage(BMessage* message, BHandler* handler)
 	// Handle function key shortcuts for stepping
 	switch (message->what) {
 		case B_KEY_DOWN:
-			if (fActiveThread != NULL) {
+			if (fActiveThread != NULL && fTraceUpdateRunner == NULL) {
 				int32 key;
 				uint32 modifiers;
 				if (message->FindInt32("key", &key) == B_OK
@@ -393,12 +396,20 @@ TeamWindow::MessageReceived(BMessage* message)
 		case MSG_THREAD_STEP_OVER:
 		case MSG_THREAD_STEP_INTO:
 		case MSG_THREAD_STEP_OUT:
-			if (fActiveThread != NULL) {
+			if (fActiveThread != NULL && fTraceUpdateRunner == NULL) {
 				fListener->ThreadActionRequested(fActiveThread->ID(),
 					message->what);
 			}
 			break;
 
+		case MSG_CLEAR_STACK_TRACE:
+		{
+			if (fTraceUpdateRunner != NULL) {
+				_SetActiveStackTrace(NULL);
+				_UpdateRunButtons();
+			}
+			break;
+		}
 		case MSG_THREAD_STATE_CHANGED:
 		{
 			int32 threadID;
@@ -729,7 +740,8 @@ void
 TeamWindow::ThreadActionRequested(::Thread* thread, uint32 action,
 	target_addr_t address)
 {
-	fListener->ThreadActionRequested(thread->ID(), action, address);
+	if (fTraceUpdateRunner == NULL)
+		fListener->ThreadActionRequested(thread->ID(), action, address);
 }
 
 
@@ -1049,6 +1061,9 @@ TeamWindow::_SetActiveImage(Image* image)
 void
 TeamWindow::_SetActiveStackTrace(StackTrace* stackTrace)
 {
+	delete fTraceUpdateRunner;
+	fTraceUpdateRunner = NULL;
+
 	if (stackTrace == fActiveStackTrace)
 		return;
 
@@ -1065,6 +1080,8 @@ TeamWindow::_SetActiveStackTrace(StackTrace* stackTrace)
 
 	if (fActiveStackTrace != NULL)
 		_SetActiveStackFrame(fActiveStackTrace->FrameAt(0));
+	else
+		_SetActiveStackFrame(NULL);
 }
 
 
@@ -1278,12 +1295,14 @@ TeamWindow::_UpdateRunButtons()
 			fStepOutButton->SetEnabled(false);
 			break;
 		case THREAD_STATE_RUNNING:
-			fRunButton->SetLabel("Debug");
+			if (fTraceUpdateRunner == NULL) {
-			fRunButton->SetMessage(new BMessage(MSG_THREAD_STOP));
+				fRunButton->SetLabel("Debug");
-			fRunButton->SetEnabled(true);
+				fRunButton->SetMessage(new BMessage(MSG_THREAD_STOP));
-			fStepOverButton->SetEnabled(false);
+				fRunButton->SetEnabled(true);
-			fStepIntoButton->SetEnabled(false);
+				fStepOverButton->SetEnabled(false);
-			fStepOutButton->SetEnabled(false);
+				fStepIntoButton->SetEnabled(false);
+				fStepOutButton->SetEnabled(false);
+			}
 			break;
 		case THREAD_STATE_STOPPED:
 			fRunButton->SetLabel("Run");
@@ -1432,6 +1451,21 @@ TeamWindow::_HandleStackTraceChanged(thread_id threadID)
 
 	locker.Unlock();
 
+	if (stackTrace == NULL) {
+		if (fTraceUpdateRunner != NULL)
+			return;
+
+		BMessage message(MSG_CLEAR_STACK_TRACE);
+		fTraceUpdateRunner = new(std::nothrow) BMessageRunner(this,
+			message, 250000, 1);
+		if (fTraceUpdateRunner != NULL
+			&& fTraceUpdateRunner->InitCheck() == B_OK) {
+			fStackTraceView->SetStackTraceClearPending();
+			fVariablesView->SetStackFrameClearPending();
+			return;
+		}
+	}
+
 	_SetActiveStackTrace(stackTrace);
 }
 

src/apps/debugger/user_interface/gui/team_window/TeamWindow.h

@@ -26,6 +26,7 @@
 class BButton;
 class BFilePanel;
 class BMenuBar;
+class BMessageRunner;
 class BSplitView;
 class BStringView;
 class BTabView;
@@ -182,6 +183,7 @@ private:
 			SourceCode*			fActiveSourceCode;
 			ActiveSourceObject	fActiveSourceObject;
 			UserInterfaceListener* fListener;
+			BMessageRunner*		fTraceUpdateRunner;
 			BTabView*			fTabView;
 			BTabView*			fLocalsTabView;
 			ThreadListView*		fThreadListView;

src/apps/debugger/user_interface/gui/team_window/VariablesView.cpp

@@ -1428,6 +1428,7 @@ VariablesView::VariablesView(Listener* listener)
 	fPreviousViewState(NULL),
 	fViewStateHistory(NULL),
 	fTableCellContextMenuTracker(NULL),
+	fFrameClearPending(false),
 	fListener(listener)
 {
 	SetName("Variables");
@@ -1471,6 +1472,8 @@ VariablesView::Create(Listener* listener)
 void
 VariablesView::SetStackFrame(Thread* thread, StackFrame* stackFrame)
 {
+	fFrameClearPending = false;
+
 	if (thread == fThread && stackFrame == fStackFrame)
 		return;
 
@@ -1859,12 +1862,20 @@ VariablesView::SaveSettings(BMessage& settings)
 }
 
 
+void
+VariablesView::SetStackFrameClearPending()
+{
+	fFrameClearPending = true;
+}
 
 
 void
 VariablesView::TreeTableNodeExpandedChanged(TreeTable* table,
 	const TreeTablePath& path, bool expanded)
 {
+	if (fFrameClearPending)
+		return;
+
 	if (expanded) {
 		ModelNode* node = (ModelNode*)fVariableTableModel->NodeForPath(path);
 		if (node == NULL)
@@ -1901,6 +1912,9 @@ VariablesView::TreeTableCellMouseDown(TreeTable* table,
 	if ((buttons & B_SECONDARY_MOUSE_BUTTON) == 0)
 		return;
 
+	if (fFrameClearPending)
+		return;
+
 	_FinishContextMenu(true);
 
 	ModelNode* node = (ModelNode*)fVariableTableModel->NodeForPath(path);

src/apps/debugger/user_interface/gui/team_window/VariablesView.h

@@ -47,6 +47,8 @@ public:
 			void				LoadSettings(const BMessage& settings);
 			status_t			SaveSettings(BMessage& settings);
 
+			void				SetStackFrameClearPending();
+
 private:
 	// TreeTableListener
 	virtual	void				TreeTableNodeExpandedChanged(TreeTable* table,
@@ -94,6 +96,7 @@ private:
 			VariablesViewState*	fPreviousViewState;
 			VariablesViewStateHistory* fViewStateHistory;
 			TableCellContextMenuTracker* fTableCellContextMenuTracker;
+			bool				fFrameClearPending;
 			Listener*			fListener;
 };