ew_listbox.cpp

基于Windml2.0的窗口系统原代码 , 以及和MFC CDC兼容的CDC

#include "EW_ListBox.h"

BEGIN_MESSAGE_MAP(EW_ListBox, EW_Widget)
	ON_DRAW         (EW_ListBox::OnDraw)
	ON_KEYDOWN      (EW_ListBox::OnKeyDown)
    ON_MOUSE        (EW_ListBox::OnMouse)	
END_MESSAGE_MAP()

EW_ListBox::EW_ListBox(const EW_Rect & Rect , const WORD wLimit,  WORD wID , const WORD wStyle)
		:EW_Widget(Rect, wID, FS_NONE)
{
	m_nItemHeight = 21;	
	m_wLimit = wLimit;
	m_Rect = Rect;
	m_nSelectedIndex = -1;
}

EW_ListBox::~EW_ListBox()
{
	ITEM_STRING_LIST::iterator it = m_vItemList.begin();
	for(; it != m_vItemList.end();it++)
	{
		delete[] *it;	
	}
	m_vItemList.clear();		
}

void EW_ListBox::OnDraw(EW_OSAdaptor * pAdaptor)
{	
	pAdaptor->BeginDraw(m_Rect);
			
	//draw background
    pAdaptor->FillRect(m_Rect ,RGB(168, 168, 168) ,  RGB(255, 255, 255));     
        
    //draw menu items
	ITEM_STRING_LIST::iterator it = m_vItemList.begin();
	int i = 0;
	for (; it != m_vItemList.end(); it++,i++){
		
		EW_Rect rect(m_Rect.wLeft + 1 , m_Rect.wTop + i *m_nItemHeight + 1,
				m_Rect.wRight - 1, m_Rect.wTop + (i + 1) *m_nItemHeight);	
										
		if(m_nSelectedIndex == i){
		//选择项
			//画选择项的背景
			pAdaptor->FillRect(rect, RGB(168, 168, 168) , RGB(0, 0, 168)); 	
			
			//画文字
			pAdaptor->DrawText(*it , m_Rect.wLeft + 2, m_Rect.wTop + i * m_nItemHeight + 2 , RGB(255, 255, 255));					
		}else{
		//非选择项
			//画非选择项的背景
			pAdaptor->FillRect(rect, RGB(168, 168, 168) , RGB(250, 250, 250)); 	
			
			pAdaptor->DrawText(*it , m_Rect.wLeft + 2, m_Rect.wTop + i * m_nItemHeight + 2 , RGB(0 , 0 , 0));					
		}//end if							
	}//end for
            
    pAdaptor->EndDraw();              				
}

void EW_ListBox::AddItem(char *szItemText , int index)
{				
	int length = strlen(szItemText);
	char *itemText = new char[length + 1];
	strcpy(itemText , szItemText);
	
	if(index == -1){
	//在队列最后插入		
		m_vItemList.push_back(itemText);					
		
	}else{
	//在索引处插入
				
		ITEM_STRING_LIST::iterator it = m_vItemList.begin();
		it += index;
		m_vItemList.insert(it , itemText);		
	}		
}
	
void EW_ListBox::DeleteItem(int index)
{
	if(index < 0 || index >= m_vItemList.size())
		return;
	
	//删除此项
	ITEM_STRING_LIST::iterator it = m_vItemList.begin();
	it += index;

	delete[] *it;
	
	//列表中删除
	m_vItemList.erase(it);			
}
	
void EW_ListBox::MoveUp()
{	
	if(m_nSelectedIndex == -1)
		return ;
	
	//增加当前索引
	m_nSelectedIndex--;
		
	//重绘菜单
	OnDraw(EW_GetAdaptor());

}
	
void EW_ListBox::MoveDown()
{
	if(m_nSelectedIndex == m_vItemList.size() - 1)
		return ;
	
	//增加当前索引
	m_nSelectedIndex++;
		
	//重绘菜单
	OnDraw(EW_GetAdaptor());
}

char * EW_ListBox::GetText(int nIndex)
{
	if(nIndex < 0 || nIndex > m_vItemList.size() - 1)
		return NULL;
	
	//删除此项
	ITEM_STRING_LIST::iterator it = m_vItemList.begin();
	it += nIndex;
	
	
	return *it;
}

int EW_ListBox::GetCurSel() 
{ 
	return m_nSelectedIndex; 
}
		
void EW_ListBox::SetSelectedItem(int xPos , int yPos)
{
	if (xPos >= m_Rect.wLeft + 2 && yPos >= m_Rect.wTop && xPos < m_Rect.wRight && yPos < m_Rect.wBottom - 2)
    {
    	m_nSelectedIndex = (yPos - 2 - m_Rect.wTop) / m_nItemHeight;
		if(m_nSelectedIndex >= m_vItemList.size())
			m_nSelectedIndex = -1;
    }else
    	m_nSelectedIndex = -1;    	
}


bool EW_ListBox::OnKeyDown(EW_Message * pMsg)
{
		UGL_WCHAR key = pMsg->lData;  
	switch(key)
	{
		case FVK_UP:
			MoveUp();
			break;	
		case FVK_DOWN:
			MoveDown();
			break;													
		case FVK_ENTER:
			{
			m_nSelectedIndex = -1;    
			OnDraw(EW_GetAdaptor());		
			}
			break;		
		default:
			break;		
	}//end switch		
	
	return true;
}

bool EW_ListBox::OnMouse(EW_Message * pMsg)
{
	return true;
}