CScrollV
CScrollV 是 "垂直滚动条" 复合控件之中的类。
描述
CScrollV 的目的在于创建垂直滚动条。
声明
class CScrollV : public CScroll标称库文件
#include <Controls\Scrolls.mqh>| 继承体系 CObject CWnd CWndContainer CScroll CScrollV |
下面提供的代码的结果：
类方法
| 依赖控件 | |
|---|---|
| CreateInc | 创建滚动条递增按钮 |
| CreateDec | 创建滚动条递减按钮 |
| CreateThumb | 创建滚动条滑块按钮 (可被拖动) |
| 内部事件处理器 | |
| OnResize | "调整大小" 事件处理器 |
| OnChangePos | "位置变化" 事件处理器 |
| 拖动事件处理器 | |
| OnThumbDragStart | "滑块拖动开始" 事件处理器 |
| OnThumbDragProcess | "滑块拖动过程" 事件处理器 |
| OnThumbDragEnd | "滑块拖动结束" 事件处理器 |
| 位置 | |
| CalcPos | 获取坐标处的滚动条位置 |
| 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, Show, Hide, Save, Load |
| 方法继承自类 CScroll Create, OnEvent, MinPos, MinPos, MaxPos, MaxPos, CurrPos, CurrPos |
创建垂直滚动条面板的示例：
//+------------------------------------------------------------------+
//| ControlsScrollV.mq5 |
//| Copyright 2017, MetaQuotes Software Corp. |
//| https://www.mql5.com |
//+------------------------------------------------------------------+
#property copyright "Copyright 2017, MetaQuotes Software Corp."
#property link "https://www.mql5.com"
#property version "1.00"
#property description "Control Panels and Dialogs. Demonstration class CScrollV"
#include <Controls\Dialog.mqh>
#include <Controls\Scrolls.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:
CScrollV m_scroll_v; // CScrollV 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 CreateScrollV(void);
//--- handlers of the dependent controls events
void OnScrollInc(void);
void OnScrollDec(void);
};
//+------------------------------------------------------------------+
//| Event Handling |
//+------------------------------------------------------------------+
EVENT_MAP_BEGIN(CControlsDialog)
ON_EVENT(ON_SCROLL_INC,m_scroll_v,OnScrollInc)
ON_EVENT(ON_SCROLL_DEC,m_scroll_v,OnScrollDec)
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(!CreateScrollV())
return(false);
//--- succeed
return(true);
}
//+------------------------------------------------------------------+
//| Create the CScrollsV object |
//+------------------------------------------------------------------+
bool CControlsDialog::CreateScrollV(void)
{
//--- coordinates
int x1=INDENT_LEFT;
int y1=INDENT_TOP;
int x2=x1+18;
int y2=y1+LIST_HEIGHT;
//--- create
if(!m_scroll_v.Create(m_chart_id,m_name+"ScrollV",m_subwin,x1,y1,x2,y2))
return(false);
//--- set up the scrollbar
m_scroll_v.MinPos(0);
//--- set up the scrollbar
m_scroll_v.MaxPos(10);
if(!Add(m_scroll_v))
return(false);
Comment("Position of the scrollbar ",m_scroll_v.CurrPos());
//--- succeed
return(true);
}
//+------------------------------------------------------------------+
//| Event handler |
//+------------------------------------------------------------------+
void CControlsDialog::OnScrollInc(void)
{
Comment("Position of the scrollbar ",m_scroll_v.CurrPos());
}
//+------------------------------------------------------------------+
//| Event handler |
//+------------------------------------------------------------------+
void CControlsDialog::OnScrollDec(void)
{
Comment("Position of the scrollbar ",m_scroll_v.CurrPos());
}
//+------------------------------------------------------------------+
//| 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)
{
//--- clear comments
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);
}