EasyAndFastMod/Controls/ComboBox.mqh

<EFBFBD><EFBFBD>//+------------------------------------------------------------------+
//|                                                     ComboBox.mqh |
//|                        Copyright 2015, MetaQuotes Software Corp. |
//|                                              http://www.mql5.com |
//+------------------------------------------------------------------+
#include "..\Element.mqh"
#include "ListView.mqh"
//+------------------------------------------------------------------+
//| ;0AA 4;O A>740=8O :><18=8@>20==>3> A?8A:0                       |
//+------------------------------------------------------------------+
class CComboBox : public CElement
  {
private:
   //--- -:75<?;O@K 4;O A>740=8O M;5<5=B0
   CButton           m_button;
   CListView         m_listview;
   //---  568< M;5<5=B0 A G5:-1>:A><
   bool              m_checkbox_mode;
   //---
public:
                     CComboBox(void);
                    ~CComboBox(void);
   //--- 5B>4K 4;O A>740=8O :><1>-1>:A0
   bool              CreateComboBox(const string text,const int x_gap,const int y_gap);
   //---
private:
   void              InitializeProperties(const string text,const int x_gap,const int y_gap);
   bool              CreateCanvas(void);
   bool              CreateButton(void);
   bool              CreateList(void);
   //---
public:
   //--- >72@0I05B C:070B5;8 =0 (1) :=>?:C, (2) A?8A>: 8 (3) ?>;>AC ?@>:@CB:8
   CButton          *GetButtonPointer(void)                 { return(::GetPointer(m_button));         }
   CListView        *GetListViewPointer(void)               { return(::GetPointer(m_listview));       }
   CScrollV         *GetScrollVPointer(void)                { return(m_listview.GetScrollVPointer()); }
   //--- (1)  07<5@ A?8A:0 (:>;8G5AB2> ?C=:B>2) (2) CAB0=>2:0 @568<0 M;5<5=B0 A G5:-1>:A><
   void              ItemsTotal(const int items_total)      { m_listview.ListSize(items_total);       }
   void              CheckBoxMode(const bool state)         { m_checkbox_mode=state;                  }
   //--- !>AB>O=85 M;5<5=B0 (=060B/>B60B)
   bool              IsPressed(void) const { return(m_is_pressed); }
   void              IsPressed(const bool state);
   //--- !>E@0=O5B ?5@540==>5 7=0G5=85 2 A?8A:5 ?> C:070==><C 8=45:AC
   void              SetValue(const int item_index,const string item_text);
   //--- >72@0I05B 2K1@0==>5 7=0G5=85 2 A?8A:5
   string            GetValue(void);
   //--- K45;5=85 ?C=:B0 ?> C:070==><C 8=45:AC
   void              SelectItem(const int item_index);
   //--- 7<5=O5B B5:CI55 A>AB>O=85 :><1>-1>:A0 =0 ?@>B82>?>;>6=>5
   void              ChangeComboBoxListState(void);
   //---
public:
   //--- 1@01>BG8: A>1KB89 3@0D8:0
   virtual void      OnEvent(const int id,const long &lparam,const double &dparam,const string &sparam);
   //--- ;>:8@>2:0
   virtual void      IsLocked(const bool state);
   //--- #?@02;5=85 2848<>ABLN
   virtual void      Hide(void);
   //---  8AC5B M;5<5=B
   virtual void      Draw(void);
   //---
private:
   //--- 1@01>B:0 =060B8O =0 M;5<5=B5
   bool              OnClickElement(const string pressed_object);
   //--- 1@01>B:0 =060B8O =0 :=>?:C
   bool              OnClickButton(const string pressed_object,const int id,const int index);
   //--- 1@01>B:0 =060B8O =0 ?C=:B5 A?8A:0
   bool              OnClickListItem(const int id);

   //--- @>25@:0 =060B>9 ;52>9 :=>?:8 <KH8 =04 :=>?:>9 :><1>-1>:A0
   void              CheckPressedOverButton(void);
   //---  8AC5B :0@B8=:C
   virtual void      DrawImage(void);
  };
//+------------------------------------------------------------------+
//| Constructor                                                      |
//+------------------------------------------------------------------+
CComboBox::CComboBox(void) : m_checkbox_mode(false)
  {
//--- !>E@0=8< 8<O :;0AA0 M;5<5=B0 2 107>2>< :;0AA5
   CElementBase::ClassName(CLASS_NAME);
//---  568< 2K?040NI53> A?8A:0
   m_listview.IsDropdown(true);
   m_listview.GetScrollVPointer().IsDropdown(true);
   m_listview.GetScrollVPointer().GetIncButtonPointer().IsDropdown(true);
   m_listview.GetScrollVPointer().GetDecButtonPointer().IsDropdown(true);
  }
//+------------------------------------------------------------------+
//| Destructor                                                       |
//+------------------------------------------------------------------+
CComboBox::~CComboBox(void)
  {
  }
//+------------------------------------------------------------------+
//| 1@01>BG8: A>1KB89                                               |
//+------------------------------------------------------------------+
void CComboBox::OnEvent(const int id,const long &lparam,const double &dparam,const string &sparam)
  {
//--- 1@01>B:0 A>1KB8O ?5@5<5I5=8O :C@A>@0
   if(id==CHARTEVENT_MOUSE_MOVE)
     {
      //--- @>25@:0 =060B>9 ;52>9 :=>?:8 <KH8 =04 :=>?:>9
      CheckPressedOverButton();
      //--- 5@5@8A>20BL M;5<5=B
      if(CheckCrossingBorder())
         Update(true);
      //---
      return;
     }
//--- 1@01>B:0 A>1KB8O =060B8O =0 ?C=:B5 A?8A:0
   if(id==CHARTEVENT_CUSTOM+ON_CLICK_LIST_ITEM)
     {
      if(!OnClickListItem((int)lparam))
         return;
      //---
      return;
     }
//--- 1@01>B:0 =060B8O =0 M;5<5=B5
   if(id==CHARTEVENT_OBJECT_CLICK)
     {
      if(OnClickElement(sparam))
         return;
      //---
      return;
     }
//--- 1@01>B:0 A>1KB8O =060B8O =0 :=>?:5
   if(id==CHARTEVENT_CUSTOM+ON_CLICK_BUTTON)
     {
      if(OnClickButton(sparam,(uint)lparam,(uint)dparam))
         return;
      //---
      return;
     }
//--- 1@01>B:0 A>1KB8O 87<5=5=8O A2>9AB2 3@0D8:0
   if(id==CHARTEVENT_CHART_CHANGE)
     {
      //--- K9B8, 5A;8 (1) M;5<5=B 701;>:8@>20= 8;8 (2) :=>?:0 >B60B0
      if(CElementBase::IsLocked() || !m_button.IsPressed())
         return;
      //--- B60BL :=>?:C
      m_button.IsPressed(false);
      //--- 7<5=8BL A>AB>O=85 A?8A:0
      ChangeComboBoxListState();
      return;
     }
  }
//+------------------------------------------------------------------+
//| !>740QB 3@C??C >1J5:B>2 B8?0 :><1>-1>:A                          |
//+------------------------------------------------------------------+
bool CComboBox::CreateComboBox(const string text,const int x_gap,const int y_gap)
  {
//--- K9B8, 5A;8 =5B C:070B5;O =0 3;02=K9 M;5<5=B
   if(!CElement::CheckMainPointer())
      return(false);
//--- =8F80;870F8O A2>9AB2
   InitializeProperties(text,x_gap,y_gap);
//--- !>740=85 M;5<5=B0
   if(!CreateCanvas())
      return(false);
   if(!CreateButton())
      return(false);
   if(!CreateList())
      return(false);
//--- #AB0=>28BL B5:AB 2 :=>?:C
   m_button.LabelText(m_listview.SelectedItemText());
   return(true);
  }
//+------------------------------------------------------------------+
//| =8F80;870F8O A2>9AB2                                            |
//+------------------------------------------------------------------+
void CComboBox::InitializeProperties(const string text,const int x_gap,const int y_gap)
  {
   m_x          =CElement::CalculateX(x_gap);
   m_y          =CElement::CalculateY(y_gap);
   m_x_size     =(m_x_size<1)? 50 : m_x_size;
   m_y_size     =(m_y_size<1)? 20 : m_y_size;
   m_label_text =text;
//--- &25B D>=0 8 >BABC?K 4;O :0@B8=:8/G5:-1>:A0
   m_back_color=(m_back_color!=clrNONE)? m_back_color : m_main.BackColor();
//--- BABC?K 8 F25B B5:AB>2>9 <5B:8
   m_icon_y_gap          =(m_icon_y_gap!=WRONG_VALUE)? m_icon_y_gap : 4;
   m_label_x_gap         =(m_label_x_gap!=WRONG_VALUE)? m_label_x_gap : (m_checkbox_mode)? 20 : 0;
   m_label_y_gap         =(m_label_y_gap!=WRONG_VALUE)? m_label_y_gap : 4;
   m_label_color         =(m_label_color!=clrNONE)? m_label_color : clrBlack;
   m_label_color_hover   =(m_label_color_hover!=clrNONE)? m_label_color_hover : C'0,120,215';
   m_label_color_locked  =(m_label_color_locked!=clrNONE)? m_label_color_locked : clrSilver;
   m_label_color_pressed =(m_label_color_pressed!=clrNONE)? m_label_color_pressed : clrBlack;
//--- BABC?K >B :@09=59 B>G:8
   CElementBase::XGap(x_gap);
   CElementBase::YGap(y_gap);
  }
//+------------------------------------------------------------------+
//| !>740QB >1J5:B 4;O @8A>20=8O                                     |
//+------------------------------------------------------------------+
bool CComboBox::CreateCanvas(void)
  {
//--- $>@<8@>20=85 8<5=8 >1J5:B0
   string name=CElementBase::ElementName("combobox");
//--- A;8 =C65= M;5<5=B A G5:-1>:A><
   if(m_checkbox_mode)
     {
      IconFile(RESOURCE_CHECKBOX_OFF);
      IconFileLocked(RESOURCE_CHECKBOX_OFF_LOCKED);
      IconFilePressed(RESOURCE_CHECKBOX_ON);
      IconFilePressedLocked(RESOURCE_CHECKBOX_ON_LOCKED);
     }
//--- !>740=85 >1J5:B0
   if(!CElement::CreateCanvas(name,m_x,m_y,m_x_size,m_y_size))
      return(false);
//---
   return(true);
  }
//+------------------------------------------------------------------+
//| !>740QB :=>?:C                                                   |
//+------------------------------------------------------------------+
bool CComboBox::CreateButton(void)
  {
//--- !>E@0=8< C:070B5;L =0 @>48B5;LA:89 M;5<5=B
   m_button.MainPointer(this);
//---  07<5@K
   int x_size=(m_button.XSize()<1)? 80 : m_button.XSize();
//--- >>@48=0BK
   int x =(m_button.XGap()<1)? x_size : m_button.XGap();
   int y =0;
//--- BABC?K 4;O :0@B8=:8
   int icon_x_gap =(m_button.IconXGap()<1)? x_size-18 : m_button.IconXGap();
   int icon_y_gap =(m_button.IconYGap()<1)? 2 : m_button.IconYGap();
//--- BABC?K 4;O B5:AB0
   int label_x_gap =(m_button.LabelXGap()<1)? 7 : m_button.LabelXGap();
   int label_y_gap =(m_button.LabelYGap()<1)? 4 : m_button.LabelYGap();
//--- !2>9AB20
   m_button.NamePart("combobox_button");
   m_button.Index(0);
   m_button.TwoState(true);
   m_button.XSize(x_size);
   m_button.YSize(m_y_size);
   m_button.IconXGap(icon_x_gap);
   m_button.IconYGap(icon_y_gap);
   m_button.LabelXGap(label_x_gap);
   m_button.LabelYGap(label_y_gap);
   m_button.IsDropdown(CElementBase::IsDropdown());
   m_button.IconFile(RESOURCE_DOWN_THIN_BLACK);
   m_button.IconFileLocked(RESOURCE_DOWN_THIN_BLACK);
   m_button.CElement::IconFilePressed(RESOURCE_UP_THIN_BLACK);
   m_button.CElement::IconFilePressedLocked(RESOURCE_UP_THIN_BLACK);
   
//--- !>74048< M;5<5=B C?@02;5=8O
   if(!m_button.CreateButton("",x,y))
      return(false);
   
//--- >1028BL M;5<5=B 2 <0AA82
   CElement::AddToArray(m_button);
   return(true);
  }
//+------------------------------------------------------------------+
//| !>740QB A?8A>:                                                   |
//+------------------------------------------------------------------+
bool CComboBox::CreateList(void)
  {
//--- !>E@0=8< C:070B5;L =0 3;02=K9 M;5<5=B
   m_listview.MainPointer(this);
//--- >>@48=0BK
   int x =m_button.XGap();
   int y =m_button.YSize();
//---  07<5@K
   int x_size =(m_listview.XSize()<1)? m_button.XSize() : m_listview.XSize();
   int y_size =(m_listview.YSize()<1)? 93 : m_listview.YSize();
//--- !2>9AB20
   m_listview.XSize(x_size);
   m_listview.YSize(y_size);
   m_listview.AnchorRightWindowSide(m_button.AnchorRightWindowSide());
//--- !>74048< M;5<5=B C?@02;5=8O
   if(!m_listview.CreateListView(x,y))
      return(false);
//--- !:@KBL A?8A>:
   m_listview.Hide();
//--- >1028BL M;5<5=B 2 <0AA82
   CElement::AddToArray(m_listview);
   return(true);
  }
//+------------------------------------------------------------------+
//| #AB0=>2:0 A>AB>O=8O M;5<5=B0 (=060B/>B60B)                       |
//+------------------------------------------------------------------+
void CComboBox::IsPressed(const bool state)
  {
//--- K9B8, 5A;8 (1) M;5<5=B 701;>:8@>20= 8;8 (2) M;5<5=B C65 2 B0:>< A>AB>O=88
   if(CElementBase::IsLocked() || m_is_pressed==state)
      return;
//--- #AB0=>2:0 A>AB>O=8O
   m_is_pressed=state;
//--- #AB0=>28BL A>>B25BAB2CNICN :0@B8=:C
   CElement::ChangeImage(0,!m_is_pressed? 0 : 2);
  }
//+------------------------------------------------------------------+
//| !>E@0=O5B ?5@540==>5 7=0G5=85 2 A?8A:5 ?> C:070==><C 8=45:AC     |
//+------------------------------------------------------------------+
void CComboBox::SetValue(const int item_index,const string item_text)
  {
   m_listview.SetValue(item_index,item_text);
  }
//+------------------------------------------------------------------+
//| >72@0I05B 2K1@0==>5 2 A?8A:5 7=0G5=85                           |
//+------------------------------------------------------------------+
string CComboBox::GetValue(void)
  {
   return(m_listview.SelectedItemText());
  }
//+------------------------------------------------------------------+
//| K45;5=85 ?C=:B0 ?> C:070==><C 8=45:AC                           |
//+------------------------------------------------------------------+
void CComboBox::SelectItem(const int item_index)
  {
//--- K1@0BL ?C=:B 2 A?8A:5
   m_listview.SelectItem(item_index);
//--- #AB0=>28BL B5:AB 2 :=>?:C
   m_button.LabelText(m_listview.SelectedItemText());
  }
//+------------------------------------------------------------------+
//| ;>:8@>2:0                                                       |
//+------------------------------------------------------------------+
void CComboBox::IsLocked(const bool state)
  {
   CElement::IsLocked(state);
//--- #AB0=>28BL A>>B25BAB2CNICN :0@B8=:C
   CElement::ChangeImage(0,(m_is_locked)? !m_is_pressed? 1 : 3 : !m_is_pressed? 0 : 2);
  }
//+------------------------------------------------------------------+
//| !:@KB85                                                          |
//+------------------------------------------------------------------+
void CComboBox::Hide(void)
  {
   CElement::Hide();
//--- B60BL :=>?:C
   m_button.IsPressed(false);
  }
//+------------------------------------------------------------------+
//| 7<5=O5B B5:CI55 A>AB>O=85 :><1>-1>:A0 =0 ?@>B82>?>;>6=>5        |
//+------------------------------------------------------------------+
void CComboBox::ChangeComboBoxListState(void)
  {
//--- A;8 :=>?:0 =060B0
   if(m_button.IsPressed())
     {
      //--- >:070BL A?8A>:
      m_listview.Show();
      //--- B?@028< A>>1I5=85 =0 >?@545;5=85 4>ABC?=KE M;5<5=B>2
      ::EventChartCustom(m_chart_id,ON_SET_AVAILABLE,CElementBase::Id(),0,"");
      //--- B?@028< A>>1I5=85 >1 87<5=5=88 2 3@0D8G5A:>< 8=B5@D59A5
      ::EventChartCustom(m_chart_id,ON_CHANGE_GUI,CElementBase::Id(),0,"");
     }
   else
     {
      //--- !:@KBL A?8A>:
      m_listview.Hide();
      //--- B?@028< A>>1I5=85 =0 2>AAB0=>2;5=85 M;5<5=B>2
      ::EventChartCustom(m_chart_id,ON_SET_AVAILABLE,CElementBase::Id(),1,"");
      //--- B?@028< A>>1I5=85 >1 87<5=5=88 2 3@0D8G5A:>< 8=B5@D59A5
      ::EventChartCustom(m_chart_id,ON_CHANGE_GUI,CElementBase::Id(),0,"");
     }
  }
//+------------------------------------------------------------------+
//| 060B85 =0 G5:-1>:A5                                             |
//+------------------------------------------------------------------+
bool CComboBox::OnClickElement(const string pressed_object)
  {
//--- K945<, 5A;8 (1) M;5<5=B 701;>:8@>20= 8;8 (2) GC6>5 8<O >1J5:B0
   if(CElementBase::IsLocked() || m_canvas.ChartObjectName()!=pressed_object)
      return(false);
//--- A;8 G5:-1>:A 2:;NG5=
   if(m_checkbox_mode)
     {
      //--- 5@5:;NG8BL =0 ?@>B82>?>;>6=K9 @568<
      IsPressed(!(IsPressed()));
      //--- B?@028< A>>1I5=85 >1 MB><
      ::EventChartCustom(m_chart_id,ON_CLICK_CHECKBOX,CElementBase::Id(),CElementBase::Index(),"");
     }
//--- 0@8A>20BL M;5<5=B
   CElement::Update(true);
   return(true);
  }
//+------------------------------------------------------------------+
//| 060B85 =0 :=>?:C :><1>-1>:A0                                    |
//+------------------------------------------------------------------+
bool CComboBox::OnClickButton(const string pressed_object,const int id,const int index)
  {
//--- K9B8, 5A;8 =060B85 1K;> =0 4@C3>< M;5<5=B5
   if(!m_button.CheckElementName(pressed_object))
      return(false);
//--- K9B8, 5A;8 7=0G5=8O =5 A>2?040NB
   if(id!=m_button.Id() || index!=m_button.Index())
      return(false);
//--- 7<5=8BL A>AB>O=85 A?8A:0
   ChangeComboBoxListState();
//--- B?@028< A>>1I5=85 >1 MB><
   ::EventChartCustom(m_chart_id,ON_CLICK_COMBOBOX_BUTTON,CElementBase::Id(),0,"");
   return(true);
  }
//+------------------------------------------------------------------+
//| 1@01>B:0 =060B8O =0 ?C=:B5 A?8A:0                               |
//+------------------------------------------------------------------+
bool CComboBox::OnClickListItem(const int id)
  {
//--- K9B8, 5A;8 7=0G5=8O =5 A>2?040NB
   if(id!=CElementBase::Id())
      return(false);
//--- B60BL :=>?:C
   m_button.IsPressed(false);
//--- #AB0=>28BL B5:AB 2 :=>?:C
   m_button.LabelText(m_listview.SelectedItemText());
   m_button.Update(true);
//--- 7<5=8BL A>AB>O=85 A?8A:0
   ChangeComboBoxListState();
//--- B?@028< A>>1I5=85 >1 MB><
   ::EventChartCustom(m_chart_id,ON_CLICK_COMBOBOX_ITEM,CElementBase::Id(),0,m_label_text);
   return(true);
  }
//+------------------------------------------------------------------+
//| @>25@:0 =060B>9 ;52>9 :=>?:8 <KH8 =04 :=>?:>9                   |
//+------------------------------------------------------------------+
void CComboBox::CheckPressedOverButton(void)
  {
//--- K9B8, 5A;8 :=>?:0 C65 >B60B0
   if(!m_button.IsPressed())
      return;
//--- K9B8, 5A;8 (1) M;5<5=B 701;>:8@>20= 8;8 (2) ;520O :=>?:0 <KH8 >B60B0
   if(CElementBase::IsLocked() || !m_mouse.LeftButtonState())
      return;
//--- A;8 D>:CA0 =5B
   if(!CElementBase::MouseFocus() && !m_button.MouseFocus())
     {
      //--- K9B8, 5A;8 D>:CA =0 A?8A:5 8;8 ?>;>A0 ?@>:@CB:8 A?8A:0 2 459AB288
      if(m_listview.MouseFocus() || m_listview.ScrollState())
         return;
      //--- !:@KBL A?8A>:
      m_listview.Hide();
      m_button.IsPressed(false);
      m_button.Update(true);
      //--- 0@8A>20BL M;5<5=B
      Update(true);
      //--- B?@028< A>>1I5=85 =0 2>AAB0=>2;5=85 M;5<5=B>2
      ::EventChartCustom(m_chart_id,ON_SET_AVAILABLE,CElementBase::Id(),1,"");
      //--- B?@028< A>>1I5=85 >1 87<5=5=88 2 3@0D8G5A:>< 8=B5@D59A5
      ::EventChartCustom(m_chart_id,ON_CHANGE_GUI,CElementBase::Id(),0.0,"");
     }
  }
//+------------------------------------------------------------------+
//|  8AC5B M;5<5=B                                                   |
//+------------------------------------------------------------------+
void CComboBox::Draw(void)
  {
//--- 0@8A>20BL D>=
   CElement::DrawBackground();
//--- 0@8A>20BL :0@B8=:C
   CElement::DrawImage();
//--- 0@8A>20BL B5:AB
   CElement::DrawText();
  }
//+------------------------------------------------------------------+
//|  8AC5B :0@B8=:C                                                  |
//+------------------------------------------------------------------+
void CComboBox::DrawImage(void)
  {
//--- K9B8, 5A;8 (1) G5:-1>:A =5 =C65= 8;8 (2) :0@B8=:0 =5 >?@545;5=0
   if(!m_checkbox_mode || CElement::IconFile()=="")
      return;
//--- ?@545;8< 8=45:A
   uint image_index=(m_is_pressed)? 2 : 0;
//--- A;8 M;5<5=B =5 701;>:8@>20=
   if(!CElementBase::IsLocked())
     {
      if(CElementBase::MouseFocus())
         image_index=(m_is_pressed)? 2 : 0;
     }
   else
      image_index=(m_is_pressed)? 3 : 1;
//--- #AB0=>28BL A>>B25BAB2CNICN :0@B8=:C
   CElement::ChangeImage(0,image_index);
//---  8AC5< :0@B8=:C
   CElement::DrawImage();
  }
//+------------------------------------------------------------------+