我是 wxWidgets 的新手,尽管在此之前我已经能够让应用程序启动并相当顺利地运行。对于主窗口,我在 wxPanel 中使用了 wxGrid。一切运行良好,直到我关闭程序。
提前感谢您的任何见解。
网格是从 wxPanel 派生的类的成员:
class FormDataView
: public wxPanel
{
public:
FormDataView(wxWindow* parent);
virtual ~FormDataView();
private:
wxGrid* grid_;
}
并在构造函数中创建。网格的数据来自另一个线程,因此我创建了一个自定义事件来实际写入数据。
wxDEFINE_EVENT(FORMDATAVIEW_UPDATE, wxThreadEvent);
FormDataView::FormDataView(wxWindow* parent)
: wxPanel(parent,wxID_ANY )
{
wxBoxSizer* mbox = new wxBoxSizer(wxVERTICAL);
grid_ = new wxGrid(this, wxID_ANY );
grid_->CreateGrid(0, 0);
mbox->Add(grid_,wxSizerFlags(1).Expand());
Bind(FORMDATAVIEW_UPDATE, &FormDataView::onDataUpdate, this);
}
///
/// This function is called by a child thread when data is received.
///
void
FormDataView::onDataReceived(IFORMATTERBASE_PFONDATARECEIVED_ARGS)
{
newHeaders_ = headers;
newData_ = data;
wxThreadEvent* evt = new wxThreadEvent(FORMDATAVIEW_UPDATE);
evt->SetString("Yo.");
wxQueueEvent(this, evt);
}
///
/// Called by the event loop. This function puts the data
/// into the grid.
///
void
FormDataView::onDataUpdate(wxThreadEvent& evt)
{
FormatterStringList& headers = newHeaders_;
FormatterStringList& data = newData_;
if (grid_->GetNumberRows() <= 0)
{
wxGridCellAttr* attr = new wxGridCellAttr();
attr->SetReadOnly(true);
attr->SetAlignment(wxALIGN_CENTRE, wxALIGN_CENTRE);
for (size_t i = 0; i<headers.size(); ++i)
{
if (grid_->GetNumberCols() <= 0)
grid_->InsertCols();
else
grid_->AppendCols();
grid_->SetColLabelValue(i, headers[i].data());
grid_->SetColAttr(i, attr);
}
}
// suspend redrawing while we add data.
grid_->BeginBatch();
// insert a new row at the top of the table
grid_->InsertRows(
0, // position
1, // number of rows to insert
true); // update labels (not current used)
for (size_t i = 0; i<headers.size(); ++i)
{
if (data.size() < i)
{
grid_->SetCellValue(0, i, "");
}
else
{
grid_->SetCellValue(0, i, data[i].data());
}
}
// resume redrawing.
grid_->EndBatch();
}
一切运行良好,但是当我关闭时,我收到以下消息。我已经指出了断点所在的行。从我应该遵循的网格中清除数据是否有一些不足的顺序?
wxGrid::CellSpan
wxGrid::GetCellSize( int row, int col, int *num_rows, int *num_cols ) const
{
wxGridCellAttr *attr = GetCellAttr(row, col);
attr->GetSize( num_rows, num_cols );
attr->DecRef();
>>>>>>> if ( *num_rows == 1 && *num_cols == 1 )
return CellSpan_None; // just a normal cell
if ( *num_rows < 0 || *num_cols < 0 )
return CellSpan_Inside; // covered by a multi-span cell
// this cell spans multiple cells to its right/bottom
return CellSpan_Main;
}