Recently I'm excited to find some youtube tutorials about onchartevent and button and dialog,etc. in official library. I successfully wrote a code with button, as well as with button in a dialog. But then when I tried to code a dropdown list (not in input and ENUM..., I want the button in chart), I don't know which but I think combobox is what I have to use, and the following code does not work as wish, there's no default value, and whatever I chose it kept empty. Is there any example code out there I could learn from? Or detailed documentation about everything in official library?
Inserted Code
#property strict
#property indicator_chart_window
#include <Controls\ComboBox.mqh>
CComboBox box;
int OnInit()
{
ChartSetInteger(0,CHART_EVENT_MOUSE_MOVE,true);
box.Create(0,"box1",0,250,0,380,30);
box.ItemAdd("5min");
box.ItemAdd("15min");
box.ItemAdd("30min");
return(INIT_SUCCEEDED);
}
void OnDeinit(const int reason)
{
box.Destroy(reason);
}
int OnCalculate(const int rates_total,
const int prev_calculated,
const datetime &time[],
const double &open[],
const double &high[],
const double &low[],
const double &close[],
const long &tick_volume[],
const long &volume[],
const int &spread[])
{
return(rates_total);
}
void OnChartEvent(const int id,
const long &lparam,
const double &dparam,
const string &sparam)
{
box.OnEvent(id,lparam,dparam,sparam);
}