wxDataViewListCtrl getting column of selected row Topic is solved

[sivaranjani]

Hi,
I am using wxDataViewListCtrl and event used is EVT_DATAVIEW_SELECTION_CHANGED.From this event,I would like to get column index for the selected row.

I have tried using the below code, where evt.GetColumn() returns me -1 and when I try to use evt.GetDataViewColumn()->GetModelColumn();, it crashes. I need to know if I am following the right steps to get the current column or is there anything else I need to be doing?

Code: Select all

	int row = lc->GetSelectedRow();
	int col = evt.GetColumn();
	wxDataViewColumn *col = lc->GetCurrentColumn();
	int colno =lc->GetColumnPosition(col);
	int col = evt.GetDataViewColumn()->GetModelColumn();

Thanks.

[doublemax]

A SELECTION_CHANGED event doesn't carry information about the column.

Try wxDataViewCtrl::HitTest to find the column under the mouse pointer.

[sivaranjani]

Hi,
I have tried using wxDataViewCtrl::HitTest,but column index always returning first index of the column.Is there any other solution?

Thanks

[doublemax]

I tested with this code in the "dataview" sample and it worked:

Code: Select all

void MyFrame::OnSelectionChanged( wxDataViewEvent &event )
{
  wxDataViewCtrl *dvc = m_ctrl[0];
  wxDataViewItem item;
  wxDataViewColumn *col;
  dvc->HitTest( dvc->ScreenToClient(::wxGetMousePosition()), item, col );
  if( col != NULL )
    wxLogMessage( "column hit: %d %s", col->GetModelColumn(), col->GetTitle() );
  else
    wxLogMessage("no column found");

[happythings]

Hi,
I have tried using wxDataViewCtrl::HitTest,but column index always returning first index of the column.Is there any other solution?

Thanks

I tested with this code in the "dataview" sample and it worked:

Code: Select all

void MyFrame::OnSelectionChanged( wxDataViewEvent &event )
{
  wxDataViewCtrl *dvc = m_ctrl[0];
  wxDataViewItem item;
  wxDataViewColumn *col;
  dvc->HitTest( dvc->ScreenToClient(::wxGetMousePosition()), item, col );
  if( col != NULL )
    wxLogMessage( "column hit: %d %s", col->GetModelColumn(), col->GetTitle() );
  else
    wxLogMessage("no column found");

The Real Problem is :
When drag the the horizon scroll bar in wxDataViewCtrl to the right side columns and some left column(s) invisible, HitTest will return wrong column.
How to solve?

[doublemax]

When drag the the horizon scroll bar in wxDataViewCtrl to the right side columns and some left column(s) invisible, HitTest will return wrong column.

At least in the generic implementation of wxDataViewCtrl (which is only used under Windows), this works correctly.

What platform are you using?

[happythings]

my os is ubuntu 16.04 LTS

i tested same codes on windows, it's OK.

[doublemax]

I tested this under Linux and i think it's a bug. Please open a ticket at http://trac.wxwidgets.org

[zybertanc]

Hi,

recently I'm implementing a context_menu triggered by right click in the DataViewListCtrl and therefore I find this post. I have similar issue when getting the column of the selected item.

The context menu that pops up when I right click on an item has certain width, and the Hittest() could return a wrong column index (which is on the right of the selected item). I understand why this happens but is there a solution that in the context_menu I can still get the correct column of the selected item?

Thanks.

[ONEEYEMAN]

Hi,
What OS?

Thank you.

[zybertanc]

Hi,
What OS?

Thank you.

Hi,

I'm working on Windows.

Thank you

[doublemax]

I'm working on Windows.

In that case the code from viewtopic.php?p=182658#p182658 should work. Did you try it?

If yes, what are the exact circumstances under which this does not work?

[zybertanc]

I'm working on Windows.

In that case the code from viewtopic.php?p=182658#p182658 should work. Did you try it?

If yes, what are the exact circumstances under which this does not work?

When I right click on an item of the DataViewListCtrl and a context menu pops, and then I click a item of the menu, at this moment Hittest() (it works) returns the position of the mouse cursor, which could be eventually not where the item of the DataViewListCtrl covers, but the one on its right or below it, this makes me get the wrong column. What I need is still the selected item of the DataViewListCtrl when I act in the poped context menu.

[doublemax]

You need to determine the item and column before you show the popup menu. Use wxWindow::GetPopupMenuSelectionFromUser() to show the popup. It's a blocking call, so when it returns, you still have the information about the selected item.
https://docs.wxwidgets.org/trunk/classw ... 682a61a93e

[zybertanc]

You need to determine the item and column before you show the popup menu. Use wxWindow::GetPopupMenuSelectionFromUser() to show the popup. It's a blocking call, so when it returns, you still have the information about the selected item.
https://docs.wxwidgets.org/trunk/classw ... 682a61a93e

Thank you for this tips. It now works and I get what is expected.