Discussion of article "Graphical interfaces X: Advanced management of lists and tables. Code optimization (build 7)" - page 9

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Well, Tol, thanks for the hint:

//--- Columns
   for(uint c=l; c<m_visible_columns_total; c++)
     {
      //--- Get the current position of the vertical scroll bar slider
      v=m_scrollv.CurrentPos()+t;
      //--- Rows
      for(uint r=t; r<m_visible_rows_total; r++)
        {
         //--- Offset table data
         if(v>=t && v<m_rows_total && h>=l && h<m_columns_total)
           {
            //--- Adjustment for the highlighted line
            color back_color=(m_selected_item==v) ? m_selected_row_color : m_vcolumns[h].m_cell_color[v];
            color text_color=(m_selected_item==v) ? m_selected_row_text_color : m_vcolumns[h].m_text_color[v];
            //--- Adjust (1) values, (2) background colour, (3) text colour and (4) text alignment in cells
            SetCellParameters(c,r,m_vcolumns[h].m_vrows[v],back_color,text_color,m_vcolumns[h].m_text_align[v]);
            v++;
           }
        }
      //---
      h++;
     }
So everything works as it should ;)
 

Forum on trading, automated trading systems and testing trading strategies

EasyAndFastGUI library

Viktor Glovluk, 2017.01.26 10:42 AM.

Dear forum members, please help!

On the basis of this library from Anatoli Kazharski , trying to weld an owl and wanted to organise a record in the file states of checkboxes and values of input fields! But in order not to record every time ALL values, I can not understand how to determine the element that was clicked! In the user application there is an event handler, and the parameter lparam is just responsible for the index of the element, but how to find the element by this index that would then work with it I can not understand!

Thanks in advance!


 

Viktor Glovluk, 2017.01.26 10:42

Dear forum members, please help me!

On the basis of this library from Anatoli Kazharski , I am trying to weld an owl and wanted to organise a record in the file states of checkboxes and values of input fields! But in order not to record every time ALL values, I can not understand how to determine the element that was clicked! In the user application there is an event handler, and the parameter lparam is just responsible for the index of the element, but how to find the element by this index that would then work with it I can not understand!

Thanks in advance!

Clicking on the checkboxes can be tracked by the event with the identifier ON_CLICK_LABEL.

In lparam comes the value of the element identifier.

Example:

//+------------------------------------------------------------------+
//| Event handler|
//+------------------------------------------------------------------+
void CProgram::OnEvent(const int id,const long &lparam,const double &dparam,const string &sparam)
  {
//--- Click event on the text label
   if(id==CHARTEVENT_CUSTOM+ON_CLICK_LABEL)
     {
      //--- If you clicked on the first checkbox
      if(lparam==m_checkbox1.Id())
        {
         //---
        }
     }
  }
 

Is this really the only way?

//--- If you clicked on the first checkbox

if(lparam==m_checkbox1.Id())

Answered already after I left this post! Thank you! And I have to go through all the checkboxes and input fields? And as an example if there are a "heap" of them? There is no array that stores all the indexes of the items? Then by this index to get the necessary values (e.g. clicked or unclicked checkbox, value in the input field)!
 
Viktor Glovluk:

Is that the only way?

How do you want it? Clarify.
 
Viktor Glovluk:

...

What's an example if there's a "heap" of them? There is no array that stores all the indexes of elements? Then by this index to get the necessary values (e.g. clicked or unclicked checkbox, value in the input field)!

Look at the content of the CWndContainer class. They are all stored there in the WindowElements structure. They can be accessed from the user class.

   //--- Structure of arrays of elements
   struct WindowElements
     {
      //--- Total array of all objects
      CChartObject     *m_objects[];
      //--- Total array of all elements
      CElementBase     *m_elements[];

      //--- Personal arrays of elements:
      // Array of context menus
      CContextMenu     *m_context_menus[];
      //--- Array of main menus
      CMenuBar         *m_menu_bars[];
      //--- Tooltips
      CTooltip         *m_tooltips[];
      //--- Array of drop-down lists of different types
      CElementBase     *m_drop_lists[];
      //--- Array of scroll bars
      CElementBase     *m_scrolls[];
      //--- Array of tables of text labels
      CElementBase     *m_labels_tables[];
      //--- Array of tables from input fields
      CElementBase     *m_tables[];
      //--- Array of drawn tables
      CElementBase     *m_canvas_tables[];
      //--- Array of tabs
      CTabs            *m_tabs[];
      //--- Array of tabs with pictures
      CIconTabs        *m_icon_tabs[];
      //--- Array of calendars
      CCalendar        *m_calendars[];
      //--- Array of drop-down calendars
      CDropCalendar    *m_drop_calendars[];
      //--- Tree lists
      CTreeView        *m_treeview_lists[];
      //--- File Navigators
      CFileNavigator   *m_file_navigators[];
      //--- Standard graphics (graphics objects)
      CStandardChart   *m_sub_charts[];
      //--- Picture Sliders
      CPicturesSlider  *m_pictures_slider[];
      //--- Time
      CTimeEdit        *m_time_edits[];
      //--- Multiline fields
      CTextBox         *m_text_boxes[];
     };
   //--- Array of element arrays for each window
   WindowElements    m_wnd[];
 

The further away, the better! :)

Again I came across event handler implementations that I don't understand! When creating a custom application, it is supposed to connect the GUI through a class:

//--- Connection of the trade panel class
#include "Menu.mqh"
CProgram program;

but then how to catch button presses, how to get the states of checkboxes and values of input fields, if they are in the private zone of CProgram class? Should I move what I need to public or do I misunderstand something?

 
Viktor Glovluk:

...

but then how to catch button presses, how to get the states of the checkboxes and values of input fields, ...

In the CProgram handler.

//+------------------------------------------------------------------+
//| Event handler|
//+------------------------------------------------------------------+
void CProgram::OnEvent(const int id,const long &lparam,const double &dparam,const string &sparam)
  {
//--- Click event on the text label
   if(id==CHARTEVENT_CUSTOM+ON_CLICK_LABEL)
     {

     }

  } 

//---

All articles have MQL application sample files that show how to handle events of controls.

 
Anatoli Kazharski:

In the CProgram handler.

//+------------------------------------------------------------------+
//| Event handler|
//+------------------------------------------------------------------+
void CProgram::OnEvent(const int id,const long &lparam,const double &dparam,const string &sparam)
  {
//--- Click event on the text label
   if(id==CHARTEVENT_CUSTOM+ON_CLICK_LABEL)
     {

     }

  } 

//---

All the articles have MQL application sample files that show how to handle control events.

In the CProgram handler it is clear, but this handler is for the interface, right? You should not shove trade solutions into it! I understand very little about OOP, mostly all my knowledge comes from your articles, so I can be stupid! :)

So, for example, how to implement in the Expert Advisor the opening of an order, the lotness of which is set in the input field? I need to get the value of this field in the EA itself!

 
Viktor Glovluk:

In the CProgram handler it is clear, but this handler is for the interface, right? You shouldn't be shoving trade solutions into it!

Why not? Yes, you can. It is a class of your MQL-application (indicator or Expert Advisor). Everything is the same.

You can get the value from the input field like this:

m_spin_edit1.GetValue()
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