CComboBox
CComboBox 是 ComboBox 复合控件之中的类 (含依赖控件)。
描述
ComboBox 由列表框构成, 结合静态控件, 目的用于选择。当用户选择下拉键头时, 控件的列表框部分可以向下展开。
声明
class CComboBox : public CWndContainer标称库文件
#include <Controls\ComboBox.mqh>| 继承体系 CObject CWnd CWndContainer CComboBox |
下面提供的代码的结果：
类方法
| 创建 | |
|---|---|
| 创建 | 创建控件 |
| 图表事件处理器 | |
| OnEvent | 所有图表事件的句柄 |
| 添加 | |
| AddItem | 添加一个项目 |
| 设置 | |
| ListViewItems | 设置显示在控件上的项目数量 |
| 数据 | |
| Select | 按照索引选择当前列表项 |
| SelectByText | 按照文本选择当前列表项 |
| SelectByValue | 按照值选择当前列表项 |
| 只读数据 | |
| 数值 | 获取当前列表项的值 |
| 依赖控件 | |
| CreateEdit | 创建依赖控件 (编辑) |
| CreateButton | 创建依赖控件 (按钮) |
| CreateList | 创建依赖控件 (列表视野) |
| 依赖控件事件处理器 | |
| OnClickEdit | "点击编辑" 事件处理器 (虚函数) |
| OnClickButton | "点击按钮" 事件处理器 (虚函数) |
| OnChangeList | "改变列表" 事件处理器 (虚函数) |
| 显示/隐藏 | |
| ListShow | 显示项目列表 |
| ListHide | 隐藏项目列表 |
| 方法继承自类 CObject Prev, Prev, Next, Next, Type, Compare |
|---|
| 方法继承自类 CWnd Name, ControlsTotal, Control, Rect, Left, Left, Top, Top, Right, Right, Bottom, Bottom, Width, Width, Height, Height, Size, Size, Size, Contains, Contains, Alignment, Align, Id, IsEnabled, IsVisible, Visible, IsActive, Activate, Deactivate, StateFlags, StateFlags, StateFlagsSet, StateFlagsReset, PropFlags, PropFlags, PropFlagsSet, PropFlagsReset, MouseX, MouseX, MouseY, MouseY, MouseFlags, MouseFlags, MouseFocusKill, BringToTop |
| 方法继承自类 CWndContainer Destroy, OnMouseEvent, ControlsTotal, Control, ControlFind, MouseFocusKill, Add, Add, Delete, Delete, Move, Move, Shift, Id, Enable, Disable, Hide |
创建组合框控制面板的示例：
//+------------------------------------------------------------------+
//| ControlsComboBox.mq5 |
//| Copyright 2015, MetaQuotes Software Corp. |
//| https://www.mql5.com |
//+------------------------------------------------------------------+
#property copyright "Copyright 2015, MetaQuotes Software Corp."
#property link "https://www.mql5.com"
#property version "1.00"
#property description "Control Panels and Dialogs. Demonstration class CComboBox"
#include <Controls\Dialog.mqh>
#include <Controls\ComboBox.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:
CComboBox m_combo_box;; // CComboBox 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 CreateComboBox(void);
//--- handlers of the dependent controls events
void OnChangeComboBox(void);
};
//+------------------------------------------------------------------+
//| Event Handling |
//+------------------------------------------------------------------+
EVENT_MAP_BEGIN(CControlsDialog)
ON_EVENT(ON_CHANGE,m_combo_box,OnChangeComboBox)
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(!CreateComboBox())
return(false);
//--- succeed
return(true);
}
//+------------------------------------------------------------------+
//| Create the "ComboBox" element |
//+------------------------------------------------------------------+
bool CControlsDialog::CreateComboBox(void)
{
//--- coordinates
int x1=INDENT_LEFT;
int y1=INDENT_TOP+(EDIT_HEIGHT+CONTROLS_GAP_Y)+
(BUTTON_HEIGHT+CONTROLS_GAP_Y)+
(EDIT_HEIGHT+CONTROLS_GAP_Y);
int x2=x1+GROUP_WIDTH;
int y2=y1+EDIT_HEIGHT;
//--- create
if(!m_combo_box.Create(m_chart_id,m_name+"ComboBox",m_subwin,x1,y1,x2,y2))
return(false);
if(!Add(m_combo_box))
return(false);
//--- fill out with strings
for(int i=0;i<16;i++)
if(!m_combo_box.ItemAdd("Item "+IntegerToString(i)))
return(false);
//--- succeed
return(true);
}
//+------------------------------------------------------------------+
//| Event handler |
//+------------------------------------------------------------------+
void CControlsDialog::OnChangeComboBox(void)
{
Comment(__FUNCTION__+" \""+m_combo_box.Select()+"\"");
}
//+------------------------------------------------------------------+
//| 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)
{
//---
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);
}