I fear, I found a bug in wxGrid::SetColLabelSize() with wxGRID_AUTOSIZE, when the label has empty lines. In this case the calculated label size is too small.
This happens beacause wxGrid::GetTextBoxSize() uses wxTextMeasureBase::GetTextExtent() for each line. But this function returns zero for empty lines. That leads to the too small label sizes.
Here some code to reproduce this issue:
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#include <wx/app.h>
#include <wx/frame.h>
#include <wx/sizer.h>
#include <wx/grid.h>
class TestFrame : public wxFrame {
public:
TestFrame::TestFrame(bool restorePerspective, wxWindow* parent, wxWindowID id = wxID_ANY, const wxString& caption = _T(""), const wxPoint& pos = wxDefaultPosition, const wxSize& size = wxDefaultSize) :
wxFrame(parent, id, caption) {
auto top = new wxBoxSizer(wxVERTICAL);
auto grid = new wxGrid(this, wxID_ANY);
grid->SetTable(new wxGridStringTable(30, 12), true);
grid->SetColLabelValue(0, wxT("1. row \n\n2.row \n\n3.row\n\n4. row"));
grid->SetRowLabelSize(wxGRID_AUTOSIZE);
grid->SetColLabelSize(wxGRID_AUTOSIZE);
top->Add(grid, wxSizerFlags().Expand());
SetSizerAndFit(top);
};
};
class TestApp : public wxApp {
public:
virtual bool OnInit() {
auto frame = new TestFrame(false, nullptr);
frame->Show();
return true;
}
};
wxIMPLEMENT_APP(TestApp);
A simple workaround is, to add spaces to empty lines.
So, when adjusting line 15 to
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grid->SetColLabelValue(0, wxT("1. row \n \n2.row \n \n3.row\n \n4. row"));
