324 lines
13 KiB
MQL5
324 lines
13 KiB
MQL5
//+------------------------------------------------------------------+
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//| ComboBox.mqh |
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//| Copyright 2000-2025, MetaQuotes Ltd. |
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//| https://www.mql5.com |
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//+------------------------------------------------------------------+
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#include "WndContainer.mqh"
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#include "Edit.mqh"
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#include "BmpButton.mqh"
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#include "ListView.mqh"
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//+------------------------------------------------------------------+
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//| Resources |
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//+------------------------------------------------------------------+
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//--- Can not place the same file into resource twice
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#resource "res\\DropOn.bmp" // image file
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#resource "res\\DropOff.bmp" // image file
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//+------------------------------------------------------------------+
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//| Class CComboBox |
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//| Usage: drop-down list |
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//+------------------------------------------------------------------+
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class CComboBox : public CWndContainer
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{
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private:
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//--- dependent controls
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CEdit m_edit; // the entry field object
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CBmpButton m_drop; // the button object
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CListView m_list; // the drop-down list object
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//--- set up
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int m_item_height; // height of visible row
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int m_view_items; // number of visible rows in the drop-down list
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public:
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CComboBox(void);
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~CComboBox(void);
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//--- create
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virtual bool Create(const long chart,const string name,const int subwin,const int x1,const int y1,const int x2,const int y2);
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//--- chart event handler
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virtual bool OnEvent(const int id,const long &lparam,const double &dparam,const string &sparam);
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//--- fill
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bool AddItem(const string item,const long value=0);
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//--- set up
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void ListViewItems(const int value) { m_view_items=value; }
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//--- data
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virtual bool ItemAdd(const string item,const long value=0) { return(m_list.ItemAdd(item,value)); }
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virtual bool ItemInsert(const int index,const string item,const long value=0) { return(m_list.ItemInsert(index,item,value)); }
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virtual bool ItemUpdate(const int index,const string item,const long value=0) { return(m_list.ItemUpdate(index,item,value)); }
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virtual bool ItemDelete(const int index) { return(m_list.ItemDelete(index)); }
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virtual bool ItemsClear(void) { return(m_list.ItemsClear()); }
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//--- data
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string Select(void) { return(m_edit.Text()); }
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bool Select(const int index);
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bool SelectByText(const string text);
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bool SelectByValue(const long value);
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//--- data (read only)
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long Value(void) { return(m_list.Value()); }
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//--- state
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virtual bool Show(void);
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//--- methods for working with files
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virtual bool Save(const int file_handle);
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virtual bool Load(const int file_handle);
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protected:
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//--- create dependent controls
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virtual bool CreateEdit(void);
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virtual bool CreateButton(void);
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virtual bool CreateList(void);
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//--- handlers of the dependent controls events
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virtual bool OnClickEdit(void);
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virtual bool OnClickButton(void);
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virtual bool OnChangeList(void);
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//--- show drop-down list
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bool ListShow(void);
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bool ListHide(void);
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void CheckListHide(const int id,int x,int y);
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};
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//+------------------------------------------------------------------+
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//| Common handler of chart events |
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//+------------------------------------------------------------------+
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EVENT_MAP_BEGIN(CComboBox)
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ON_EVENT(ON_CLICK,m_edit,OnClickEdit)
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ON_EVENT(ON_CLICK,m_drop,OnClickButton)
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ON_EVENT(ON_CHANGE,m_list,OnChangeList)
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CheckListHide(id,(int)lparam,(int)dparam);
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//+------------------------------------------------------------------+
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//| |
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//+------------------------------------------------------------------+
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EVENT_MAP_END(CWndContainer)
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//+------------------------------------------------------------------+
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//| Constructor |
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//+------------------------------------------------------------------+
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CComboBox::CComboBox(void) : m_item_height(CONTROLS_COMBO_ITEM_HEIGHT),
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m_view_items(CONTROLS_COMBO_ITEMS_VIEW)
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{
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}
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//+------------------------------------------------------------------+
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//| Destructor |
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//+------------------------------------------------------------------+
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CComboBox::~CComboBox(void)
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{
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}
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//+------------------------------------------------------------------+
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//| Create a control |
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//+------------------------------------------------------------------+
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bool CComboBox::Create(const long chart,const string name,const int subwin,const int x1,const int y1,const int x2,const int y2)
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{
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//--- check height
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if(y2-y1<CONTROLS_COMBO_MIN_HEIGHT)
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return(false);
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//--- call method of the parent class
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if(!CWndContainer::Create(chart,name,subwin,x1,y1,x2,y2))
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return(false);
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//--- create dependent controls
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if(!CreateEdit())
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return(false);
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if(!CreateButton())
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return(false);
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if(!CreateList())
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return(false);
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//--- succeeded
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return(true);
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}
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//+------------------------------------------------------------------+
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//| Create main entry field |
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//+------------------------------------------------------------------+
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bool CComboBox::CreateEdit(void)
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{
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//--- create
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if(!m_edit.Create(m_chart_id,m_name+"Edit",m_subwin,0,0,Width(),Height()))
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return(false);
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if(!m_edit.Text(""))
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return(false);
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if(!m_edit.ReadOnly(true))
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return(false);
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if(!Add(m_edit))
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return(false);
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//--- succeeded
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return(true);
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}
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//+------------------------------------------------------------------+
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//| Create button |
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//+------------------------------------------------------------------+
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bool CComboBox::CreateButton(void)
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{
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//--- right align button (try to make equal offsets from top and bottom)
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int x1=Width()-(CONTROLS_BUTTON_SIZE+CONTROLS_COMBO_BUTTON_X_OFF);
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int y1=(Height()-CONTROLS_BUTTON_SIZE)/2;
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int x2=x1+CONTROLS_BUTTON_SIZE;
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int y2=y1+CONTROLS_BUTTON_SIZE;
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//--- create
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if(!m_drop.Create(m_chart_id,m_name+"Drop",m_subwin,x1,y1,x2,y2))
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return(false);
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if(!m_drop.BmpNames("::res\\DropOff.bmp","::res\\DropOn.bmp"))
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return(false);
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if(!Add(m_drop))
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return(false);
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m_drop.Locking(true);
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//--- succeeded
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return(true);
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}
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//+------------------------------------------------------------------+
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//| Create drop-down list |
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//+------------------------------------------------------------------+
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bool CComboBox::CreateList(void)
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{
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//--- create
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if(m_list.TotalView(m_view_items))
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{
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if(!m_list.Create(m_chart_id,m_name+"List",m_subwin,0,Height(),Width(),0))
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return(false);
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if(!Add(m_list))
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return(false);
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m_list.Hide();
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}
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//--- succeeded
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return(true);
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}
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//+------------------------------------------------------------------+
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//| Add item (row) |
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//+------------------------------------------------------------------+
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bool CComboBox::AddItem(const string item,const long value)
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{
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//--- add item to list
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return(m_list.AddItem(item,value));
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}
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//+------------------------------------------------------------------+
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//| Select item |
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//+------------------------------------------------------------------+
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bool CComboBox::Select(const int index)
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{
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if(!m_list.Select(index))
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return(false);
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//--- call the handler
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return(OnChangeList());
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}
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//+------------------------------------------------------------------+
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//| Select item (by text) |
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//+------------------------------------------------------------------+
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bool CComboBox::SelectByText(const string text)
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{
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if(!m_list.SelectByText(text))
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return(false);
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//--- call the handler
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return(OnChangeList());
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}
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//+------------------------------------------------------------------+
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//| Select item (by value) |
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//+------------------------------------------------------------------+
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bool CComboBox::SelectByValue(const long value)
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{
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if(!m_list.SelectByValue(value))
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return(false);
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//--- call the handler
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return(OnChangeList());
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}
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//+------------------------------------------------------------------+
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//| Makes the control visible |
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//+------------------------------------------------------------------+
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bool CComboBox::Show(void)
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{
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m_edit.Show();
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m_drop.Show();
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m_list.Hide();
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//--- call of the method of the parent class
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return(CWnd::Show());
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}
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//+------------------------------------------------------------------+
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//| |
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//+------------------------------------------------------------------+
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bool CComboBox::Save(const int file_handle)
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{
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//--- check
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if(file_handle==INVALID_HANDLE)
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return(false);
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//---
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FileWriteLong(file_handle,Value());
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//--- succeed
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return(true);
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}
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//+------------------------------------------------------------------+
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//| |
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//+------------------------------------------------------------------+
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bool CComboBox::Load(const int file_handle)
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{
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//--- check
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if(file_handle==INVALID_HANDLE)
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return(false);
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//---
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if(!FileIsEnding(file_handle))
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SelectByValue(FileReadLong(file_handle));
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//--- succeed
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return(true);
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}
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//+------------------------------------------------------------------+
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//| Handler of click on main entry field |
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//+------------------------------------------------------------------+
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bool CComboBox::OnClickEdit(void)
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{
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//--- change button state
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if(!m_drop.Pressed(!m_drop.Pressed()))
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return(false);
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//--- call the click on button handler
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return(OnClickButton());
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}
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//+------------------------------------------------------------------+
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//| Handler of click on button |
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//+------------------------------------------------------------------+
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bool CComboBox::OnClickButton(void)
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{
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//--- show or hide the drop-down list depending on the button state
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return((m_drop.Pressed()) ? ListShow() : ListHide());
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}
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//+------------------------------------------------------------------+
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//| Handler of click on drop-down list |
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//+------------------------------------------------------------------+
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bool CComboBox::OnChangeList(void)
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{
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string text=m_list.Select();
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//--- hide the list, depress the button
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ListHide();
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m_drop.Pressed(false);
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//--- set text in the main entry field
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m_edit.Text(text);
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//--- send notification
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EventChartCustom(CONTROLS_SELF_MESSAGE,ON_CHANGE,m_id,0.0,m_name);
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//--- handled
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return(true);
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}
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//+------------------------------------------------------------------+
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//| Show the drop-down list |
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//+------------------------------------------------------------------+
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bool CComboBox::ListShow(void)
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{
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BringToTop();
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//--- show the list
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return(m_list.Show());
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}
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//+------------------------------------------------------------------+
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//| Hide drop-down list |
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//+------------------------------------------------------------------+
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bool CComboBox::ListHide(void)
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{
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//--- hide the list
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return(m_list.Hide());
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}
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//+------------------------------------------------------------------+
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//| Hide the drop-down element if necessary |
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//+------------------------------------------------------------------+
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void CComboBox::CheckListHide(const int id,int x,int y)
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{
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//--- check event ID
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if(id!=CHARTEVENT_CLICK)
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return;
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//--- check visibility of the drop-down element
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if(!m_list.IsVisible())
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return;
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//--- check mouse cursor's position
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y-=(int)ChartGetInteger(m_chart_id,CHART_WINDOW_YDISTANCE,m_subwin);
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if(!m_edit.Contains(x,y) && !m_list.Contains(x,y))
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{
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m_drop.Pressed(false);
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m_list.Hide();
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}
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}
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//+------------------------------------------------------------------+
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