C++ ModelMenuItem::SetEnabled方法代码示例

void
SpringLoadedFolderSetMenuStates(const BMenu* menu,
	const BObjectList<BString>* typeslist)
{
	if (!menu || !typeslist || typeslist->IsEmpty())
		return;

	//	if a types list exists
	//		iterate through the list and see if each item
	//		can support any item in the list
	//		set the enabled state of the item
	int32 count = menu->CountItems();
	for (int32 index = 0 ; index < count ; index++) {
		ModelMenuItem* item = dynamic_cast<ModelMenuItem*>(menu->ItemAt(index));
		if (!item)
			continue;

		const Model* model = item->TargetModel();
		if (!model)
			continue;

		if (model->IsSymLink()) {
			//	find out what the model is, resolve if symlink
			BEntry entry(model->EntryRef(), true);
			if (entry.InitCheck() == B_OK) {
				if (entry.IsDirectory()) {
					//	folder? always keep enabled
					item->SetEnabled(true);
				} else {
					//	other, check its support
					Model resolvedModel(&entry);
					int32 supported = resolvedModel.SupportsMimeType(NULL, typeslist);
					item->SetEnabled(supported != kDoesNotSupportType);
				}
			} else
				//	bad entry ref (bad symlink?), disable
				item->SetEnabled(false);
		} else if (model->IsDirectory() || model->IsRoot() || model->IsVolume())
			//	always enabled if a container
			item->SetEnabled(true);
		else if (model->IsFile() || model->IsExecutable()) {
			int32 supported = model->SupportsMimeType(NULL, typeslist);
			item->SetEnabled(supported != kDoesNotSupportType);
		} else
			item->SetEnabled(false);
	}
}

ModelMenuItem * 
BSlowContextMenu::NewModelItem(Model *model, const BMessage *invokeMessage,
	const BMessenger &target, bool suppressFolderHierarchy,
	BContainerWindow *parentWindow, const BObjectList<BString> *typeslist,
	TrackingHookData *hook)
{
	if (model->InitCheck() != B_OK)
		return NULL;

	entry_ref ref;
	bool container = false;
	if (model->IsSymLink()) {
	
		Model *newResolvedModel = NULL;
		Model *result = model->LinkTo();

		if (!result) {
			newResolvedModel = new Model(model->EntryRef(), true, true);

			if (newResolvedModel->InitCheck() != B_OK) {
				// broken link, still can show though, bail
				delete newResolvedModel;
				newResolvedModel = NULL;
			}
			
			result = newResolvedModel;
		}

		if (result) {
			BModelOpener opener(result);
				// open the model, if it ain't open already
					
			PoseInfo poseInfo;
			ssize_t size = -1;
			
			if (result->Node()) 
				size = result->Node()->ReadAttr(kAttrPoseInfo, B_RAW_TYPE, 0,
					&poseInfo, sizeof(poseInfo));
	
			result->CloseNode();

			ref = *result->EntryRef();
			container = result->IsContainer();
		}
		model->SetLinkTo(result);
	} else {
		ref = *model->EntryRef();
		container = model->IsContainer();
	}

	BMessage *message = new BMessage(*invokeMessage);
	message->AddRef("refs", model->EntryRef());

	// Truncate the name if necessary
	BString truncatedString(model->Name());
	be_plain_font->TruncateString(&truncatedString, B_TRUNCATE_END,
		BNavMenu::GetMaxMenuWidth());

	ModelMenuItem *item = NULL;
	if (!container || suppressFolderHierarchy) {
		item = new ModelMenuItem(model, truncatedString.String(), message);
		if (invokeMessage->what != B_REFS_RECEIVED)
			item->SetEnabled(false);
	} else {
		BNavMenu *menu = new BNavMenu(truncatedString.String(),
			invokeMessage->what, target, parentWindow, typeslist);
		
		menu->SetNavDir(&ref);
		if (hook)
			menu->InitTrackingHook(hook->fTrackingHook, &(hook->fTarget),
				hook->fDragMessage);

		item = new ModelMenuItem(model, menu);
		item->SetMessage(message);
	}

	return item;
}

ModelMenuItem * 
BNavMenu::NewModelItem(Model *model, const BMessage *invokeMessage,
	const BMessenger &target, bool suppressFolderHierarchy,
	BContainerWindow *parentWindow, const BObjectList<BString> *typeslist,
	TrackingHookData *hook)
{
	if (model->InitCheck() != B_OK)
		return 0;
	entry_ref ref;
	bool container = false;
	if (model->IsSymLink()) {
	
		Model *newResolvedModel = 0;
		Model *result = model->LinkTo();

		if (!result) {
			newResolvedModel = new Model(model->EntryRef(), true, true);

			if (newResolvedModel->InitCheck() != B_OK) {
				// broken link, still can show though, bail
				delete newResolvedModel;
				result = 0;
			} else
				result = newResolvedModel;
		}

		if (result) {
			BModelOpener opener(result);
				// open the model, if it ain't open already
					
			PoseInfo poseInfo;
			ssize_t size = -1;
			
			if (result->Node()) 
				size = result->Node()->ReadAttr(kAttrPoseInfo, B_RAW_TYPE, 0,
					&poseInfo, sizeof(poseInfo));
	
			result->CloseNode();

			if (size == sizeof(poseInfo) && !BPoseView::PoseVisible(result,
				&poseInfo, false)) {
				// link target sez it doesn't want to be visible,
				// don't show the link
				PRINT(("not showing hidden item %s\n", model->Name()));
				delete newResolvedModel;
				return 0;
			}
			ref = *result->EntryRef();
			container = result->IsContainer();
		}
		model->SetLinkTo(result);
	} else {
		ref = *model->EntryRef();
		container = model->IsContainer();
	}

	BMessage *message = new BMessage(*invokeMessage);
	message->AddRef("refs", model->EntryRef());

	// Truncate the name if necessary
	BString truncatedString;
	TruncString(be_plain_font, model->Name(), truncatedString, GetMaxMenuWidth());

	ModelMenuItem *item = NULL;
	if (!container || suppressFolderHierarchy) {
		item = new ModelMenuItem(model, truncatedString.String(), message);
		if (invokeMessage->what != B_REFS_RECEIVED)
			item->SetEnabled(false);
			// the above is broken for FavoritesMenu::AddNextItem, which uses a
			// workaround - should fix this
	} else {
		BNavMenu *menu = new BNavMenu(truncatedString.String(),
			invokeMessage->what, target, parentWindow, typeslist);
		
		menu->SetNavDir(&ref);
		if (hook)
			menu->InitTrackingHook(hook->fTrackingHook, &(hook->fTarget),
				hook->fDragMessage);

		item = new ModelMenuItem(model, menu);
		item->SetMessage(message);
	}
	
	return item;
}