C++ TBarView::DragStart方法代码示例

void
TWindowMenu::AttachedToWindow()
{
	SetFont(be_plain_font);

	RemoveItems(0, CountItems(), true);

	int32 miniCount = 0;

	bool dragging = false;
	TBarView* barview =(static_cast<TBarApp*>(be_app))->BarView();
	if (barview && barview->LockLooper()) {
		//	'dragging' mode set in BarView::CacheDragData
		//		invoke in MouseEnter in ExpandoMenuBar
		dragging = barview->Dragging();
		if (dragging) {
			// We don't want to show the menu when dragging, but it's not
			// possible to remove a submenu once it exists, so we simply hide it
			// Don't call BMenu::Hide(), it causes the menu to pop up every now
			// and then.
			Window()->Hide();
			//	if in expando (horizontal or vertical)
			if (barview->Expando()) {
				SetTrackingHook(barview->MenuTrackingHook,
					barview->GetTrackingHookData());
			}
			barview->DragStart();
		}
		barview->UnlockLooper();
	}

	int32 parentMenuItems = 0;

	int32 numTeams = fTeam->CountItems();
	for (int32 i = 0; i < numTeams; i++) {
		team_id	theTeam = (team_id)fTeam->ItemAt(i);
		int32 count = 0;
		int32* tokens = get_token_list(theTeam, &count);

		for (int32 j = 0; j < count; j++) {
			client_window_info* wInfo = get_window_info(tokens[j]);
			if (wInfo == NULL)
				continue;

			if (WindowShouldBeListed(wInfo->feel)
				&& (wInfo->show_hide_level <= 0 || wInfo->is_mini)) {
				// Don't add new items if we're expanded. We've already done
				// this, they've just been moved.
				int32 numItems = CountItems();
				int32 addIndex = 0;
				for (; addIndex < numItems; addIndex++)
					if (strcasecmp(ItemAt(addIndex)->Label(), wInfo->name) > 0)
						break;

				if (!fExpanded) {
					TWindowMenuItem* item = new TWindowMenuItem(wInfo->name,
						wInfo->server_token, wInfo->is_mini,
						((1 << current_workspace()) & wInfo->workspaces) != 0,
						dragging);

					// disable app's window dropping for now
					if (dragging)
						item->SetEnabled(false);

					AddItem(item,
						TWindowMenuItem::InsertIndexFor(this, 0, item));
				} else {
					TTeamMenuItem* parentItem
						= static_cast<TTeamMenuItem*>(Superitem());
					if (parentItem->ExpandedWindowItem(wInfo->server_token)) {
						TWindowMenuItem* item = parentItem->ExpandedWindowItem(
							wInfo->server_token);
						if (item == NULL)
							continue;

						item->SetTo(wInfo->name, wInfo->server_token,
							wInfo->is_mini,
							((1 << current_workspace()) & wInfo->workspaces)
								!= 0, dragging);
						parentMenuItems++;
					}
				}

				if (wInfo->is_mini)
					miniCount++;
			}
			free(wInfo);
		}
		free(tokens);
	}

	int32 itemCount = CountItems() + parentMenuItems;
	if (itemCount < 1) {
		TWindowMenuItem* noWindowsItem =
 			new TWindowMenuItem("No windows", -1, false, false);

		noWindowsItem->SetEnabled(false);

		AddItem(noWindowsItem);

//.........这里部分代码省略.........

void
TTeamMenu::AttachedToWindow()
{
	RemoveItems(0, CountItems(), true);
		// remove all items

	BMessenger self(this);
	BList teamList;
	TBarApp::Subscribe(self, &teamList);

	TBarView* barview = (dynamic_cast<TBarApp*>(be_app))->BarView();
	bool dragging = barview && barview->Dragging();
	int32 iconSize = static_cast<TBarApp*>(be_app)->IconSize();
	desk_settings* settings = ((TBarApp*)be_app)->Settings();

	float width = sMinimumWindowWidth - iconSize - 4;

	if (settings->sortRunningApps)
		teamList.SortItems(CompareByName);

	int32 count = teamList.CountItems();
	for (int32 i = 0; i < count; i++) {
		// add items back
		BarTeamInfo* barInfo = (BarTeamInfo*)teamList.ItemAt(i);
		TTeamMenuItem* item = new TTeamMenuItem(barInfo->teams,
			barInfo->icon, barInfo->name, barInfo->sig,
			width, -1, !settings->hideLabels, true);

		if (settings->trackerAlwaysFirst
			&& strcmp(barInfo->sig, kTrackerSignature) == 0) {
			AddItem(item, 0);
		} else
			AddItem(item);

		if (dragging && item != NULL) {
			bool canhandle = (dynamic_cast<TBarApp*>(be_app))->BarView()->
				AppCanHandleTypes(item->Signature());
			if (item->IsEnabled() != canhandle)
				item->SetEnabled(canhandle);

			BMenu* menu = item->Submenu();
			if (menu)
				menu->SetTrackingHook(barview->MenuTrackingHook,
					barview->GetTrackingHookData());
		}
	}

	if (CountItems() == 0) {
		BMenuItem* item = new BMenuItem("no application running", NULL);
		item->SetEnabled(false);
		AddItem(item);
	}

	if (dragging && barview->LockLooper()) {
		SetTrackingHook(barview->MenuTrackingHook,
			barview->GetTrackingHookData());
		barview->DragStart();
		barview->UnlockLooper();
	}

	BMenu::AttachedToWindow();
}