C++ (Cpp) DataSource::SetColor示例

示例#1

status_t
ActivityView::AddDataSource(const DataSource* source, const BMessage* state)
{
	if (source == NULL)
		return B_BAD_VALUE;

	BAutolock _(fSourcesLock);

	// Search for the correct insert spot to maintain the order of the sources
	int32 insert = DataSource::IndexOf(source);
	for (int32 i = 0; i < fSources.CountItems() && i < insert; i++) {
		DataSource* before = fSources.ItemAt(i);
		if (DataSource::IndexOf(before) > insert) {
			insert = i;
			break;
		}
	}
	if (insert > fSources.CountItems())
		insert = fSources.CountItems();

	// Generate DataHistory and ViewHistory objects for the source
	// (one might need one history per CPU)

	uint32 count = 1;
	if (source->PerCPU()) {
		SystemInfo info;
		count = info.CPUCount();
	}

	for (uint32 i = 0; i < count; i++) {
		DataHistory* values = new(std::nothrow) DataHistory(10 * 60000000LL,
			RefreshInterval());
		ListAddDeleter<DataHistory> valuesDeleter(fValues, values, insert);

		ViewHistory* viewValues = new(std::nothrow) ViewHistory;
		ListAddDeleter<ViewHistory> viewValuesDeleter(fViewValues, viewValues,
			insert);

		if (valuesDeleter.Failed() || viewValuesDeleter.Failed())
			return B_NO_MEMORY;

		values->SetScale(_ScaleFor(source->ScaleType()));

		DataSource* copy;
		if (source->PerCPU())
			copy = source->CopyForCPU(i);
		else
			copy = source->Copy();

		ListAddDeleter<DataSource> sourceDeleter(fSources, copy, insert);
		if (sourceDeleter.Failed())
			return B_NO_MEMORY;

		BString colorName = source->Name();
		colorName << " color";
		if (state != NULL) {
			const rgb_color* color = NULL;
			ssize_t colorLength;
			if (state->FindData(colorName.String(), B_RGB_COLOR_TYPE, i,
					(const void**)&color, &colorLength) == B_OK
				&& colorLength == sizeof(rgb_color))
				copy->SetColor(*color);
		}

		valuesDeleter.Detach();
		viewValuesDeleter.Detach();
		sourceDeleter.Detach();
		insert++;
	}

#ifdef __HAIKU__
	InvalidateLayout();
#endif
	return B_OK;
}