Tracker: Optimisation of AddonMenu menu construction

1. Build the list of mimetypes of files in selection only once and
reuse it for all further tests.

2. Fix a regression introduced in hrev44384 where the MimeType()
wouldn't get recognized when just changed by tracker (by that same
right click).  It would be on subsequent clicks.

3. Rename the static map variable to better fit our coding style
and be more understandable.

src/kits/tracker/ContainerWindow.cpp

@@ -130,6 +130,7 @@ class DraggableContainerIcon : public BView {
 struct AddOneAddonParams {
 	BObjectList<BMenuItem> *primaryList;
 	BObjectList<BMenuItem> *secondaryList;
+	BObjectList<BString> *mimeTypes;
 };
 
 struct StaggerOneParams {
@@ -2838,34 +2839,12 @@ BContainerWindow::EachAddon(BPath &path, bool (*eachAddon)(const Model *,
 
 	BDirectory dir;
 	BEntry entry;
+	
+	BObjectList<BString> *mimeTypes = ((AddOneAddonParams *)params)->mimeTypes;
 
 	if (dir.SetTo(path.Path()) != B_OK)
 		return false;
 
-	// build a list of the MIME types of the selected items
-
-	BObjectList<BString> mimeTypes(10, true);
-
-	int32 count = PoseView()->SelectionList()->CountItems();
-	if (!count) {
-		// just add the type of the current directory
-		AddMimeTypeString(mimeTypes, TargetModel());
-	} else {
-		for (int32 index = 0; index < count; index++) {
-			BPose *pose = PoseView()->SelectionList()->ItemAt(index);
-			AddMimeTypeString(mimeTypes, pose->TargetModel());
-			// If it's a symlink, resolves it and add the Target's MimeType
-			if (pose->TargetModel()->IsSymLink()) {
-				Model* resolved = new Model(
-					pose->TargetModel()->EntryRef(), true, true);
-				if (resolved->InitCheck() == B_OK) {
-					AddMimeTypeString(mimeTypes, resolved);
-				}
-				delete resolved;
-			}
-		}
-	}
-
 	dir.Rewind();
 	while (dir.GetNextEntry(&entry) == B_OK) {
 		Model *model = new Model(&entry);
@@ -2887,7 +2866,7 @@ BContainerWindow::EachAddon(BPath &path, bool (*eachAddon)(const Model *,
 
 		bool primary = false;
 
-		if (mimeTypes.CountItems()) {
+		if (mimeTypes->CountItems()) {
 			BFile file(&entry, B_READ_ONLY);
 			if (file.InitCheck() == B_OK) {
 				BAppFileInfo info(&file);
@@ -2905,8 +2884,8 @@ BContainerWindow::EachAddon(BPath &path, bool (*eachAddon)(const Model *,
 
 					// check all supported types if it has some set
 					if (!secondary) {
-						for (int32 i = mimeTypes.CountItems(); !primary && i-- > 0;) {
+						for (int32 i = mimeTypes->CountItems(); !primary && i-- > 0;) {
-							BString *type = mimeTypes.ItemAt(i);
+							BString *type = mimeTypes->ItemAt(i);
 							if (info.IsSupportedType(type->String())) {
 								BMimeType mimeType(type->String());
 								if (info.Supports(&mimeType))
@@ -2970,8 +2949,6 @@ BContainerWindow::BuildAddOnMenu(BMenu *menu)
 			break;
 		delete item;
 	}
-	
-	_UpdateSelectionMIMEInfo();
 
 	BObjectList<BMenuItem> primaryList;
 	BObjectList<BMenuItem> secondaryList;
@@ -2980,12 +2957,39 @@ BContainerWindow::BuildAddOnMenu(BMenu *menu)
 	params.primaryList = &primaryList;
 	params.secondaryList = &secondaryList;
 
+	// build a list of the MIME types of the selected items
+	BObjectList<BString> mimeTypes(10, true);
+
+	int32 count = PoseView()->SelectionList()->CountItems();
+	if (!count) {
+		// just add the type of the current directory
+		AddMimeTypeString(mimeTypes, TargetModel());
+	} else {
+		_UpdateSelectionMIMEInfo();
+		for (int32 index = 0; index < count; index++) {
+			BPose *pose = PoseView()->SelectionList()->ItemAt(index);
+			
+			AddMimeTypeString(mimeTypes, pose->TargetModel());
+			// If it's a symlink, resolves it and add the Target's MimeType
+			if (pose->TargetModel()->IsSymLink()) {
+				Model* resolved = new Model(
+					pose->TargetModel()->EntryRef(), true, true);
+				if (resolved->InitCheck() == B_OK) {
+					AddMimeTypeString(mimeTypes, resolved);
+				}
+				delete resolved;
+			}
+		}
+	}
+
+	params.mimeTypes = &mimeTypes;
+
 	EachAddon(AddOneAddon, &params);
 
 	primaryList.SortItems(CompareLabels);
 	secondaryList.SortItems(CompareLabels);
 
-	int32 count = primaryList.CountItems();
+	count = primaryList.CountItems();
 	for (int32 index = 0; index < count; index++)
 		menu->AddItem(primaryList.ItemAt(index));
 

src/kits/tracker/Model.cpp

@@ -883,6 +883,8 @@ Model::AttrChanged(const char *attrName)
 	if (!attrName
 		|| strcmp(attrName, kAttrMIMEType) == 0
 		|| strcmp(attrName, kAttrPreferredApp) == 0) {
+		ModelNodeLazyOpener opener(this);
+		opener.OpenNode();
 		char mimeString[B_MIME_TYPE_LENGTH];
 		BNodeInfo info(fNode);
 		if (info.GetType(mimeString) != B_OK)

src/kits/tracker/PoseView.cpp

@@ -155,7 +155,7 @@ struct attr_column_relation {
 };
 
 
-static struct attr_column_relation attributes[] = {
+static struct attr_column_relation sAttrColumnMap[] = {
 	{ AttrHashString(kAttrStatModified, B_TIME_TYPE),
 		B_STAT_MODIFICATION_TIME },
 	{ AttrHashString(kAttrStatSize, B_OFF_T_TYPE),
@@ -5466,11 +5466,11 @@ BPoseView::AttributeChanged(const BMessage *message)
 			if (message->FindInt32("fields", &fields) != B_OK)
 				return true;
 
-			for (int32 i = sizeof(attributes) / sizeof(attr_column_relation);
+			for (int i = sizeof(sAttrColumnMap) / sizeof(attr_column_relation);
 				i--;) {
-				if (attributes[i].attrHash == PrimarySort()
+				if (sAttrColumnMap[i].attrHash == PrimarySort()
-					|| attributes[i].attrHash == SecondarySort()) {
+					|| sAttrColumnMap[i].attrHash == SecondarySort()) {
-					if ((fields & attributes[i].fieldMask) != 0) {
+					if ((fields & sAttrColumnMap[i].fieldMask) != 0) {
 						_CheckPoseSortOrder(fPoseList, pose, poseListIndex);
 						if (fFiltering && visible)
 							_CheckPoseSortOrder(fFilteredPoseList, pose, index);