how is possible use mouse + shift in mql4 ?

faustf 2023.07.03 09:53

Hi i try to use in my EA the combo shift + mouse left click i build a EA in this mode (i write only a part because is so long a script but if someone want all i can past )

    if (id == CHARTEVENT_CLICK)
    {
        //--- Prepare variables
        int      x     = (int)lparam;
        int      y     = (int)dparam;
        datetime dt    = 0;
        double   price = 0;
        int      window = 0;
        
        //--- Check if the Shift key is pressed
        if ((state& 4)== 4)  //  corrispond at button Shift
        {

but when i try to use mouse left butto + shift not work, but if i remove the

if ((state& 4)== 4)  /

it work but ofcourse without shift use, anyone can help me ?

Dominik Egert 2023.07.03 10:11 #1

faustf:

Hi i try to use in my EA the combo shift + mouse left click i build a EA in this mode (i write only a part because is so long a script but if someone want all i can past )

but when i try to use mouse left butto + shift not work, but if i remove the

it work but ofcourse without shift use, anyone can help me ?

I would say, CHART_EVENT_CLICK is not triggered with a key press, you need to track both events separately.

First comes event keypress, then a second call happens with mouse click...

So you need to record the shift button state in key press event, and when the mouse click event arrives, check your recording about shift key as well...

Standard library button behaviour Detect object under mouse Any rookie question, so

faustf 2023.07.03 10:13 #2

Dominik Christian Egert #:

I would say, CHART_EVENT_CLICK is not triggered with a key press, you need to track both events separately.

First comes event keypress, then a second call happens with mouse click...

So you need to record the shift button state in key press event, and when the mouse click event arrives, check your recording about shift key as well...

do you have some example for do that ?

Dominik Egert 2023.07.03 10:17 #3

faustf #:
do you have some example for do that ?

I don't, but maybe someone else...

Lorentzos Roussos 2023.07.03 10:19 #4

Try this example :

As Dominik said the click among the key presses is too late to catch the shift so you can use a timer to kill the "indication" the shift is held down.

#property copyright "discussion"
#property link      "https://www.mql5.com/en/forum/450069"
#property version   "1.00"
#property strict

bool isShiftDown=false;
uint shiftHoldTimeStart=0;
long cancelAfterMS=333;
int OnInit()
  {
   isShiftDown=false;
   shiftHoldTimeStart=0;
   while(!EventSetMillisecondTimer(44)){
        Print("Setting timer , please wait...");
        Sleep(44);
        }
   return(INIT_SUCCEEDED);
  }

void OnDeinit(const int reason)
  {
  }

void OnTick()
  {
  }
void OnTimer()
  {
  uint now=GetTickCount();
  long difference=now-shiftHoldTimeStart;
  if(now<shiftHoldTimeStart){difference=UINT_MAX+now-shiftHoldTimeStart;}
  if(difference>cancelAfterMS){
    isShiftDown=false;
    }
  }
void OnChartEvent(const int id,
                  const long &lparam,
                  const double &dparam,
                  const string &sparam)
  {
  if(id==CHARTEVENT_KEYDOWN){
    //Print("L("+IntegerToString(lparam)+")D("+DoubleToString(dparam,0)+")S("+sparam+")");
    //holding shift down prints this L(16)D(1)S(16426)
      if(lparam==16&&dparam==1.0&&sparam=="16426")
        {
        isShiftDown=true;
        //we log the ticker time shift was pressed continuously
        shiftHoldTimeStart=GetTickCount();
        }else{
        isShiftDown=false;
        }
    }
  //if shift is down
  if(id==CHARTEVENT_CLICK){
    if(isShiftDown){Alert("pop");isShiftDown=false;}
    }  
  }

faustf 2023.07.03 10:24 #5

Lorentzos Roussos #:

Try this example :

As Dominik said the click among the key presses is too late to catch the shift so you can use a timer to kill the "indication" the shift is held down.

thanks so much i study

faustf 2023.07.03 19:34 #6

how remove the object in chart ?? i used this code in onDeint but not work

 //--- delete all objects 
   int obj_total=ObjectsTotal(); 
   PrintFormat("Total %d objects",obj_total); 
   for(i=obj_total-1;i>=0;i--) 
     { 
      string name=ObjectName(i); 
      PrintFormat("object %d: %s",i,name); 
      ObjectDelete(name); 
     }

Lorentzos Roussos 2023.07.03 20:09 #7

faustf #:

how remove the object in chart ?? i used this code in onDeint but not work

You can have a "tag" of the objects of the indicator/ea

string system_tag="EA_";

This prefix is used in all the object this ea/indicator creates

And on deinit you call :

ObjectsDeleteAll(ChartID(),system_tag);

faustf 2023.07.03 20:35 #8

sorry i dont understund where i msut use

string system_tag="EA_";

//+------------------------------------------------------------------+
//|                                                  BUTTONCLICK.mq4 |
//|                                  Copyright 2023, MetaQuotes Ltd. |
//|                                             https://www.mql5.com |
//+------------------------------------------------------------------+
#property copyright "Copyright 2023, MetaQuotes Ltd."
#property link      "https://www.mql5.com"
#property version   "1.00"
#property strict

#include <Gui.mqh>

extern color    BackgColore="clrGray";
extern color    TextColore="clrWhite";
//+------------------------------------------------------------------+
//| Expert initialization function                                   |
//+------------------------------------------------------------------+
int OnInit()
  {
//---
      Create_Button(0,                    // chart's ID
                    "Button_Apri",         // button name
                    0,                    // X coordinate
                    90,                   // Y coordinate
                    60,                   // button width
                    20,                   // button height
                    CORNER_LEFT_UPPER,    // chart corner for anchoring
                    "APRI",                // text
                    "Courier New",        // font
                    10,                   // font size
                    TextColore,             // text color
                    BackgColore,              // background color
                    false                 // in the background
                      );
//---
   return(INIT_SUCCEEDED);
  }
//+------------------------------------------------------------------+
//| Expert deinitialization function                                 |
//+------------------------------------------------------------------+
void OnDeinit(const int reason)
  {
//---
   ObjectsDeleteAll(ChartID(),system_tag);
  }
//+------------------------------------------------------------------+
//| Expert tick function                                             |
//+------------------------------------------------------------------+
void OnTick()
  {
//---
   
  }
//+------------------------------------------------------------------+

Lorentzos Roussos 2023.07.04 10:43 #9

faustf #:
sorry i dont understund where i msut use

//+------------------------------------------------------------------+
//|                                                  BUTTONCLICK.mq4 |
//|                                  Copyright 2023, MetaQuotes Ltd. |
//|                                             https://www.mql5.com |
//+------------------------------------------------------------------+
#property copyright "Copyright 2023, MetaQuotes Ltd."
#property link      "https://www.mql5.com"
#property version   "1.00"
#property strict

#include <Gui.mqh>

extern color    BackgColore="clrGray";
extern color    TextColore="clrWhite";
//+------------------------------------------------------------------+
//| Expert initialization function                                   |
//+------------------------------------------------------------------+
string system_tag="EA_";
int OnInit()
  {
//---
      Create_Button(0,                    // chart's ID
                    system_tag+"Button_Apri",         // button name
                    0,                    // X coordinate
                    90,                   // Y coordinate
                    60,                   // button width
                    20,                   // button height
                    CORNER_LEFT_UPPER,    // chart corner for anchoring
                    "APRI",                // text
                    "Courier New",        // font
                    10,                   // font size
                    TextColore,             // text color
                    BackgColore,              // background color
                    false                 // in the background
                      );
//---
   return(INIT_SUCCEEDED);
  }
//+------------------------------------------------------------------+
//| Expert deinitialization function                                 |
//+------------------------------------------------------------------+
void OnDeinit(const int reason)
  {
//---
   ObjectsDeleteAll(ChartID(),system_tag);
  }
//+------------------------------------------------------------------+
//| Expert tick function                                             |
//+------------------------------------------------------------------+
void OnTick()
  {
//---
   
  }
//+------------------------------------------------------------------+

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