function tsExcelActiveXCellActivate(h,varargin) 
% TSEXCELACTIVEXCELLACTIVATE is the callback for 'selectionchange' action

% Author: Rong Chen 
% Revised: 
% Copyright 1986-2004 The MathWorks, Inc.

if ~strcmp(varargin{end}, 'SelectionChange')
    return
end
h=varargin{1}.handle;
% get starting row and column number from ActX
selcolumn=varargin{1}.Selection.column;
selrow=varargin{1}.Selection.row;
% get valid block size and treat single cell separately
try
    tmpValue=varargin{1}.Selection.Value;
    if iscell(tmpValue)
        % more than multiple cells
        selsize=size(tmpValue);
    else
        % single cell
        selsize=[1,1];
    end
catch
    % it is in the 'select all' situation if Selection.Value returns error
    selsize=size(varargin{1}.ActiveSheet.UsedRange.Value);
end

% deal with the first column/row for smart selection
if get(h.Handles.COMBdataSample,'Value')==1
    % time vector is stored as a column
    if selrow==1
        % first row is selected
        ignored=h.IgnoreFirstColumnRow;
        if ignored>0
            selrow=ignored+1;
            selsize(1)=selsize(1)-ignored;
%             if ignored==h.IOData.checkLimit
%                 msgbox(sprintf('The first %d time points are invalid.  Auto-selection starts from the %d time point',...
%                     h.IOData.checkLimit,h.IOData.checkLimit+1),'Time Series Tools');
%             end
        end
    end
else
    % time vector is stored as a row
    if selcolumn==1
        % first row is selected
        ignored=h.IgnoreFirstColumnRow;
        if ignored>0
            selcolumn=ignored+1;
            selsize(2)=selsize(2)-ignored;
%             if ignored==h.IOData.checkLimit
%                 msgbox(sprintf('The first %d time points are invalid.  Auto-selection starts from the %d time point',...
%                     h.IOData.checkLimit,h.IOData.checkLimit+1),'Time Series Tools');
%             end
        end
    end
end

% if the end of the selected block is beyond the UsedRange, use the
% UsedRange as the end of the block instead
if get(h.Handles.COMBdataSample,'Value')==1
    if selrow>size(varargin{1}.ActiveSheet.UsedRange.Value,1)
        % starting row exceeds the used range, which means no time point
        selrow=size(varargin{1}.ActiveSheet.UsedRange.Value,1);
        selsize(1)=1;
    else
        selsize(1)=min(selrow+selsize(1)-1,size(varargin{1}.ActiveSheet.UsedRange.Value,1))-selrow+1;
    end
    % selsize(2)=max(1,min(selcolumn+selsize(2)-1,size(varargin{1}.ActiveSheet.UsedRange.Value,2))-selcolumn+1);
else
    % selsize(1)=max(1,min(selrow+selsize(1)-1,size(varargin{1}.ActiveSheet.UsedRange.Value,1))-selrow+1);
    if selcolumn>size(varargin{1}.ActiveSheet.UsedRange.Value,2)
        % starting column exceeds the used range, which means no time point
        selcolumn=size(varargin{1}.ActiveSheet.UsedRange.Value,2);
        selsize(2)=1;
    else
        selsize(2)=min(selcolumn+selsize(2)-1,size(varargin{1}.ActiveSheet.UsedRange.Value,2))-selcolumn+1;
    end
end

% update selected block parameters
h.IOData.SelectedColumns=selcolumn:selcolumn+selsize(2)-1;
h.IOData.SelectedRows=selrow:selrow+selsize(1)-1;
% update displays in the editboxes
set(h.Handles.EDTFROM,'String',[h.findcolumnletter(selcolumn) num2str(selrow)]);
set(h.Handles.EDTTO,'String',[h.findcolumnletter(selcolumn+selsize(2)-1) num2str(selrow+selsize(1)-1)]);
% check if a valid time vector exists (first and last elements)
if get(h.Handles.COMBdataSample,'Value')==1
    % time vector is stored as a column
    h.updateStartEndTime(selrow,selrow+selsize(1)-1);
else
    % time vector is stored as a row
    h.updateStartEndTime(selcolumn,selcolumn+selsize(2)-1);
end
% update display
if selsize(1)>0 && selsize(2)>0
    if ~isempty(h.Handles.ActiveX.eventlisteners)
        h.Handles.ActiveX.unregisterallevents;
    end
    tmpStr=strcat(h.findcolumnletter(selcolumn),num2str(selrow),':',h.findcolumnletter(selcolumn+selsize(2)-1),num2str(selrow+selsize(1)-1));
    h.Handles.ActiveX.ActiveSheet.Range(tmpStr).Select;
    h.Handles.ActiveX.registerevent({'SelectionChange' @(a,b,c,d) tsExcelActiveXCellActivate(h,a,b,c,d); ...
    'SheetActivate' @(a,b,c,d,e) tsExcelActiveXSheetActivate(h,a,b,c,d,e)});
end