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CScrollH

CScrollH is a class of the "Horizontal scroll bar" complex control.

Description

CScrollH is intended for creation of horizontal scroll bars.

Declaration

   class CScrollH : public CScroll

Title

   #include <Controls\Scrolls.mqh>

Inheritance hierarchy

  CObject

      CWnd

          CWndContainer

              CScroll

                  CScrollH

Result of the code provided below:

ControlsScrollH

Class Methods by Groups

Dependent controls

 

CreateInc

Creates scroll bar increment button

CreateDec

Creates scroll bar decrement button

CreateThumb

Creates scroll bar thumb button (can be dragged)

Internal event handlers

 

OnResize

"Resize" internal event handler

OnChangePos

"ChangePosition" internal event handler

Drag event handlers

 

OnThumbDragStart

"ThumbDragStart" event handler

OnThumbDragProcess

"ThumbDragProcess" event handler

OnThumbDragEnd

"ThumbDragEnd" event handler

Position

 

CalcPos

Gets scroll bar position by coordinate

Example of creating a panel with horizontal scrollbar:

//+------------------------------------------------------------------+
//|                                              ControlsScrollH.mq5 |
//|                        Copyright 2017, MetaQuotes Software Corp. |
//|                                             https://www.mql5.com |
//+------------------------------------------------------------------+
#property copyright "Copyright 2017, MetaQuotes Software Corp."
#property link      "https://www.mql5.com"
#property version   "1.00"
#property description "Control Panels and Dialogs. Demonstration class CScrollH"
#include <Controls\Dialog.mqh>
#include <Controls\Scrolls.mqh>
//+------------------------------------------------------------------+
//| defines                                                          |
//+------------------------------------------------------------------+
//--- indents and gaps
#define INDENT_LEFT                         (11)      // indent from left (with allowance for border width)
#define INDENT_TOP                          (11)      // indent from top (with allowance for border width)
#define INDENT_RIGHT                        (11)      // indent from right (with allowance for border width)
#define INDENT_BOTTOM                       (11)      // indent from bottom (with allowance for border width)
#define CONTROLS_GAP_X                      (5)       // gap by X coordinate
#define CONTROLS_GAP_Y                      (5)       // gap by Y coordinate
//--- for buttons
#define BUTTON_WIDTH                        (100)     // size by X coordinate
#define BUTTON_HEIGHT                       (20)      // size by Y coordinate
//--- for the indication area
#define EDIT_HEIGHT                         (20)      // size by Y coordinate
//--- for group controls
#define GROUP_WIDTH                         (150)     // size by X coordinate
#define LIST_HEIGHT                         (179)     // size by Y coordinate
#define RADIO_HEIGHT                        (56)      // size by Y coordinate
#define CHECK_HEIGHT                        (93)      // size by Y coordinate
//+------------------------------------------------------------------+
//| Class CControlsDialog                                            |
//| Usage: main dialog of the Controls application                   |
//+------------------------------------------------------------------+
class CControlsDialog : public CAppDialog
  {
private:
   CScrollH          m_scroll_v;                     // CScrollH object
 
public:
                     CControlsDialog(void);
                    ~CControlsDialog(void);
   //--- create
   virtual bool      Create(const long chart,const string name,const int subwin,const int x1,const int y1,const int x2,const int y2);
   //--- chart event handler
   virtual bool      OnEvent(const int id,const long &lparam,const double &dparam,const string &sparam);
 
protected:
   //--- create dependent controls
   bool              CreateScrollsH(void);
   //--- handlers of the dependent controls events
   void              OnScrollInc(void);
   void              OnScrollDec(void);
  };
//+------------------------------------------------------------------+
//| Event Handling                                                   |
//+------------------------------------------------------------------+
EVENT_MAP_BEGIN(CControlsDialog)
ON_EVENT(ON_SCROLL_INC,m_scroll_v,OnScrollInc)
ON_EVENT(ON_SCROLL_DEC,m_scroll_v,OnScrollDec)
EVENT_MAP_END(CAppDialog)
//+------------------------------------------------------------------+
//| Constructor                                                      |
//+------------------------------------------------------------------+
CControlsDialog::CControlsDialog(void)
  {
  }
//+------------------------------------------------------------------+
//| Destructor                                                       |
//+------------------------------------------------------------------+
CControlsDialog::~CControlsDialog(void)
  {
  }
//+------------------------------------------------------------------+
//| Create                                                           |
//+------------------------------------------------------------------+
bool CControlsDialog::Create(const long chart,const string name,const int subwin,const int x1,const int y1,const int x2,const int y2)
  {
   if(!CAppDialog::Create(chart,name,subwin,x1,y1,x2,y2))
      return(false);
//--- create dependent controls
   if(!CreateScrollsH())
      return(false);
//--- succeed
   return(true);
  }
//+------------------------------------------------------------------+
//| Create the CScrollsH object                                      |
//+------------------------------------------------------------------+
bool CControlsDialog::CreateScrollsH(void)
  {
//--- coordinates
   int x1=INDENT_LEFT;
   int y1=INDENT_TOP;
   int x2=x1+3*BUTTON_WIDTH;
   int y2=y1+18;
//--- create
   if(!m_scroll_v.Create(m_chart_id,m_name+"ScrollsH",m_subwin,x1,y1,x2,y2))
      return(false);
//--- set up the scrollbar
   m_scroll_v.MinPos(0);
//--- set up the scrollbar
   m_scroll_v.MaxPos(10);
   if(!Add(m_scroll_v))
      return(false);
   Comment("Position of the scrollbar ",m_scroll_v.CurrPos());
//--- succeed
   return(true);
  }
//+------------------------------------------------------------------+
//| Event handler                                                    |
//+------------------------------------------------------------------+
void CControlsDialog::OnScrollInc(void)
  {
   Comment("Position of the scrollbar ",m_scroll_v.CurrPos());
  }
//+------------------------------------------------------------------+
//| Event handler                                                    |
//+------------------------------------------------------------------+
void CControlsDialog::OnScrollDec(void)
  {
   Comment("Position of the scrollbar ",m_scroll_v.CurrPos());
  }
//+------------------------------------------------------------------+
//| Global Variables                                                 |
//+------------------------------------------------------------------+
CControlsDialog ExtDialog;
//+------------------------------------------------------------------+
//| Expert initialization function                                   |
//+------------------------------------------------------------------+
int OnInit()
  {
//--- create application dialog
   if(!ExtDialog.Create(0,"Controls",0,40,40,380,344))
      return(INIT_FAILED);
//--- run application
   ExtDialog.Run();
//--- succeed
   return(INIT_SUCCEEDED);
  }
//+------------------------------------------------------------------+
//| Expert deinitialization function                                 |
//+------------------------------------------------------------------+
void OnDeinit(const int reason)
  {
//--- clear comments
   Comment("");
//--- destroy dialog
   ExtDialog.Destroy(reason);
  }
//+------------------------------------------------------------------+
//| Expert chart event function                                      |
//+------------------------------------------------------------------+
void OnChartEvent(const int id,         // event ID  
                  const long& lparam,   // event parameter of the long type
                  const double& dparam, // event parameter of the double type
                  const string& sparam) // event parameter of the string type
  {
   ExtDialog.ChartEvent(id,lparam,dparam,sparam);
  }

 


Updated: 2017.03.22