ListView: fix track session handling

Fix various track session handling related bugs like unexpected
selected item change when mouse button was not pressed inside list view
or not currently pressed at all.

Use `fTrack->is_active` to indicate that track session is active.

Remove `fTrack->buttons` because exact mouse button is never checked in
code.

Remove some redundant conditions.

Remove now not needed workaround in `BColorListView::MouseUp`.

Change-Id: Ic4ac846019bd71af008c936dd8d7d265326cba9a
Reviewed-on: https://review.haiku-os.org/c/haiku/+/10968
Haiku-Format: Haiku-format Bot <[email protected]>
Tested-by: Commit checker robot <[email protected]>
Reviewed-by: John Scipione <[email protected]>

headers/private/shared/ColorListView.h

@@ -24,7 +24,6 @@ public:
 	virtual						~BColorListView();
 
 	virtual	bool				InitiateDrag(BPoint where, int32 index, bool wasSelected);
-	virtual	void				MouseUp(BPoint where);
 };
 
 

src/kits/interface/ListView.cpp

@@ -30,8 +30,8 @@
 struct track_data {
 	BPoint		drag_start;
 	int32		item_index;
-	int32		buttons;
 	uint32		selected_click_count;
+	bool		is_active;
 	bool		was_selected;
 	bool		try_drag;
 	bool		is_dragging;
@@ -621,19 +621,15 @@ BListView::KeyDown(const char* bytes, int32 numBytes)
 void
 BListView::MouseDown(BPoint where)
 {
+	if (fTrack->is_active)
+		return BView::MouseDown(where);
+
 	if (!IsFocus()) {
 		MakeFocus();
 		Sync();
 		Window()->UpdateIfNeeded();
 	}
 
-	int32 buttons = 0;
-	if (Window() != NULL) {
-		BMessage* currentMessage = Window()->CurrentMessage();
-		if (currentMessage != NULL)
-			currentMessage->FindInt32("buttons", &buttons);
-	}
-
 	int32 index = IndexOf(where);
 
 	// If the user double (or more) clicked within the current selection,
@@ -663,6 +659,7 @@ BListView::MouseDown(BPoint where)
 	}
 
 	if (!doubleClick) {
+		fTrack->is_active = true;
 		fTrack->drag_start = where;
 		fTrack->last_click_time = system_time();
 		fTrack->item_index = index;
@@ -673,8 +670,7 @@ BListView::MouseDown(BPoint where)
 	}
 
 	// increment/reset selected click count
-	fTrack->buttons = buttons;
-	if (fTrack->buttons > 0 && fTrack->was_selected)
+	if (fTrack->was_selected)
 		fTrack->selected_click_count++;
 	else
 		fTrack->selected_click_count = 0;
@@ -688,10 +684,13 @@ BListView::MouseDown(BPoint where)
 void
 BListView::MouseUp(BPoint where)
 {
+	if (!fTrack->is_active)
+		return BView::MouseUp(where);
+
 	bool wasDragging = fTrack->is_dragging;
 
 	// drag is over
-	fTrack->buttons = 0;
+	fTrack->is_active = false;
 	fTrack->try_drag = false;
 	fTrack->is_dragging = false;
 
@@ -728,6 +727,9 @@ BListView::MouseUp(BPoint where)
 void
 BListView::MouseMoved(BPoint where, uint32 code, const BMessage* dragMessage)
 {
+	if (!fTrack->is_active)
+		return BView::MouseMoved(where, code, dragMessage);
+
 	if (fTrack->item_index >= 0 && fTrack->try_drag) {
 		// initiate a drag if the mouse was moved far enough
 		BPoint offset = where - fTrack->drag_start;
@@ -749,9 +751,9 @@ BListView::MouseMoved(BPoint where, uint32 code, const BMessage* dragMessage)
 			index = CountItems() - 1;
 	}
 
-	// don't scroll if button not pressed or index is invalid
+	// don't scroll if index is invalid
 	int32 lastIndex = fFirstSelected;
-	if (fTrack->buttons == 0 || index == -1)
+	if (index == -1)
 		return BView::MouseMoved(where, code, dragMessage);
 
 	// don't scroll if mouse is left or right of the view
@@ -1616,8 +1618,8 @@ BListView::_InitObject(list_view_type type)
 	fTrack = new track_data;
 	fTrack->drag_start = B_ORIGIN;
 	fTrack->item_index = -1;
-	fTrack->buttons = 0;
 	fTrack->selected_click_count = 0;
+	fTrack->is_active = false;
 	fTrack->was_selected = false;
 	fTrack->try_drag = false;
 	fTrack->is_dragging = false;

src/kits/shared/ColorListView.cpp

@@ -115,12 +115,4 @@ BColorListView::InitiateDrag(BPoint where, int32 index, bool wasSelected)
 }
 
 
-void
-BColorListView::MouseUp(BPoint where)
-{
-	// TODO drag and drop from an external view should not alter selection
-	BView::MouseUp(where);
-}
-
-
 } // namespace BPrivate