mp3listbox.cpp

一些关于C++开发的多媒体制作书籍的源代码

* 输出参数：无
* 返回值  ：COLORREF, 选定列表项的文字颜色
*/
COLORREF CMP3ListBox::GetSelectedTextColor() const
{
	return this->m_crSelectedText;
}

////////////////////////////////////////////////////////////////////////
/*
* 函数名称：SetHotTextColor
* 函数介绍：设定Hot列表项的文字颜色
* 输入参数：COLORREF, Hot列表项的文字颜色
* 输出参数：无
* 返回值  ：无
*/
void CMP3ListBox::SetHotTextColor(COLORREF crColor)
{
	this->m_crHotText=crColor;
}

////////////////////////////////////////////////////////////////////////
/*
* 函数名称：GetHotTextColor
* 函数介绍：查询Hot列表项的文字颜色
* 输入参数：无
* 输出参数：无
* 返回值  ：COLORREF, Hot列表项的文字颜色
*/
COLORREF CMP3ListBox::GetHotTextColor() const
{
	return this->m_crHotText;
}

////////////////////////////////////////////////////////////////////////
/*
* 函数名称：CtlColor
* 函数介绍：响应WM_CTLCOLOR_REFLECT消息，重画自己的背景
* 输入参数：CDC* pDC, UINT nCtlColor
* 输出参数：无
* 返回值  ：HBRUSH
*/
HBRUSH CMP3ListBox::CtlColor(CDC* pDC, UINT nCtlColor) 
{
	// TODO: Change any attributes of the DC here

	// TODO: Return a different brush if the default is not desired
	return this->m_hBrush;
}

////////////////////////////////////////////////////////////////////////
/*
* 函数名称：OnContextMenu
* 函数介绍：显示快捷菜单
* 输入参数：CWnd* pWnd, CPoint point
* 输出参数：无
* 返回值  ：无
*/
void CMP3ListBox::OnContextMenu(CWnd* pWnd, CPoint point) 
{
	// TODO: Add your message handler code here
	// CG: This block was added by the Pop-up Menu component
	//选定了乐曲才显示快捷菜单
	if (this->GetSelCount()!=0)
	{
		if (point.x == -1 && point.y == -1){
			//keystroke invocation
			CRect rect;
			GetClientRect(rect);
			ClientToScreen(rect);

			point = rect.TopLeft();
			point.Offset(5, 5);
		}

		CMenu menu;
		VERIFY(menu.LoadMenu(CG_IDR_POPUP_MY_LIST_CTRL));

		CMenu* pPopup = menu.GetSubMenu(0);
		ASSERT(pPopup != NULL);

		// Menu's parent window should be "this", so the menu command be handled by self.
		pPopup->TrackPopupMenu(TPM_LEFTALIGN | TPM_RIGHTBUTTON, point.x, point.y,
			this);
	}
}

void CMP3ListBox::OnListmenuDelete() 
{
	// TODO: Add your command handler code here
	if (GetSelCount()<1)
	{
		return;
	}
	GetParent()->SendMessage(MYWM_LISTITEMDELETE, 0);
	// Wait until the message is handled.
//	MSG msg;
//	while( PeekMessage( &msg, NULL, 0, 0, PM_REMOVE) )
//		DispatchMessage(&msg);
	this->DeleteSelectedFiles();
	GetParent()->SendMessage(MYWM_LISTITEMDELETE, 1);
}

void CMP3ListBox::OnListmenuInfo() 
{
	// TODO: Add your command handler code here
	if (GetSelCount()<1)
	{
		return;
	}
	int iSelItem;
	GetSelItems(1, &iSelItem);
	ASSERT(iSelItem > -1);

	CID3TAGDlg dlg(GetPath(iSelItem), GetParent());

	if (dlg.DoModal() == IDOK)
	{
		UpdateSongInfo(iSelItem);
		// 由于不可能改变正在播放项，故不必改变父窗口的m_Title
	}
}

void CMP3ListBox::OnListmenuPlay() 
{
	// TODO: Add your command handler code here
	if (GetSelCount()<1)
	{
		return;
	}
	GetParent()->SendMessage(MYWM_LISTITEMPLAY);
}


void CMP3ListBox::OnDblclk() 
{
	// TODO: Add your control notification handler code here
	OnListmenuPlay();
}

void CMP3ListBox::OnDestroy() 
{
	int i;
	int iItemCount = GetCount();

	ASSERT(iItemCount!=LB_ERR);

	// TODO: Add your message handler code here
	for (i=0; i<iItemCount; i++)
	{
		m_pItem = (CMP3ListBoxItem *)GetItemData(i);
		delete m_pItem;
	}
	CListBox::ResetContent();

	CListBox::OnDestroy();
}

////////////////////////////////////////////////////////////////////////
/*
* 函数名称：OnSetCursor
* 函数介绍：拖动列表项时改变鼠标指针
* 输入参数：CWnd* pWnd, UINT nHitTest, UINT message
* 输出参数：无
* 返回值  ：BOOL
*/
BOOL CMP3ListBox::OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message) 
{
	// TODO: Add your message handler code here and/or call default
	//Display a different cursor while dragging. 
	if (m_bDragging) 
	{ 
		SetCursor(AfxGetApp()->LoadCursor(IDC_MOVECURSOR)); 
		return TRUE;
	} 

	return CListBox::OnSetCursor(pWnd, nHitTest, message);
}

////////////////////////////////////////////////////////////////////////
/*
* 函数名称：PreTranslateMessage
* 函数介绍：处理快捷键
* 输入参数：MSG* pMsg
* 输出参数：无
* 返回值  ：BOOL
*/
BOOL CMP3ListBox::PreTranslateMessage(MSG* pMsg) 
{
	// TODO: Add your specialized code here and/or call the base class
	if (::TranslateAccelerator(this->GetSafeHwnd(), m_hAccTable, pMsg))
	{
		return(TRUE);
	}
	return CListBox::PreTranslateMessage(pMsg);
}

///////////////////////////以下三个函数实现拖动列表项的功能/////////////////////////////
void CMP3ListBox::OnLButtonDown(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	BOOL bOutside;
	int i=ItemFromPoint(point, bOutside);
	CString str;
	str.Format("Mouse in:%d\n", i);
	TRACE(str);
	
	RECT rLast;
	GetItemRect(GetCount()-1, &rLast);
	// 按在了空白处:全不选...
	if (point.y>rLast.bottom ||
		i==0)
	{
		SetSel(-1, false);
		m_bMouseDown = false;
		CListBox::OnLButtonDown(nFlags, point);
		return;
	}

	if (!GetSel(i))		// 鼠标按下的项未被选定...
	{
		m_bMouseDown = false;
		CListBox::OnLButtonDown(nFlags, point);
	}
	else				// 鼠标按下的项已被选定(可能会被拖动)...
	{
		m_bMouseDown = true;
		GetItemRect(i, &m_rItem);
		m_nCurrentItem = i;
	}
}

void CMP3ListBox::OnMouseMove(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	int iItem;		// 鼠标当前指向的项
	BOOL bOutside;
	int i;

	// 鼠标按在选定项并拖动出该项范围才启动拖动操作...
	if (m_bMouseDown)
	{
		// Mouse在m_rItem的范围以外...
		if (point.y < m_rItem.top || point.y > m_rItem.bottom)
		{
			m_bMouseDown = false;
			// 启动拖动操作...
			{
				m_bDragging = true;
				// 改变mouse指针...

				// 为m_pSelItems和m_pSelValues申请空间并填充...
				m_nSelCount = GetSelCount();
				m_pSelItems = new int[m_nSelCount];
				m_pSelValues = new CMP3ListBoxItem*[m_nSelCount];
				GetSelItems(m_nSelCount, m_pSelItems);
				for (i=0; i<m_nSelCount; i++)
				{	
					*(m_pSelValues+i) = (CMP3ListBoxItem *)GetItemData(*(m_pSelItems+i));
				}
			}
			TRACE("Drag begins!\n");
			return;
		}
	}

	TRACE("%d\n", ((::GetKeyState(VK_LBUTTON) & 0xf0) >> 4));
	// 正在拖动...
	if (m_bDragging)
	{
		// 正在拖动, 但是鼠标没有按下(可能是由于鼠标在拖动时在LISTBOX外释放)...
		if (!HIWORD(::GetKeyState(VK_LBUTTON)))
		{
			this->OnLButtonUp(nFlags, point);
			return;
		}

		// 判断mouse指向的项是否合法, 不合法则什么都不做...
		// 不合法: iItem为当前项 或 待定项<当前项-第一选定项 或 总项数-待定项<=最后选定项-当前项
		iItem = ItemFromPoint(point, bOutside);
		if (iItem == m_nCurrentItem ||		
			iItem < m_nCurrentItem - *(m_pSelItems + 0) ||
			GetCount() - iItem
				<= *(m_pSelItems + m_nSelCount - 1) - m_nCurrentItem
			)
		{
			return;
		}

		// 移动列表项...
		if (iItem < m_nCurrentItem)	// 向上移...
		{
			for (i=0; i<m_nSelCount; i++)
			{
				//  移动列表项...
				CListBox::SetItemData(*(m_pSelItems+i), GetItemData(*(m_pSelItems+i)+iItem-m_nCurrentItem));
				CListBox::SetItemData(*(m_pSelItems+i)+iItem-m_nCurrentItem, (DWORD)(*(m_pSelValues+i)));
				// 改变选定状态...
				SetSel(*(m_pSelItems+i), false);
				SetSel(*(m_pSelItems+i)+iItem-m_nCurrentItem, true);

				// 移动了HotItem...
				if (*(m_pSelItems+i) == m_iHotItemID)
				{
					SetHotItem(*(m_pSelItems+i)+iItem-m_nCurrentItem);
					GetParent()->SendMessage(MYWM_LISTOPENEDITEMMOVE, *(m_pSelItems+i)+iItem-m_nCurrentItem);
				}
				else if(*(m_pSelItems+i)+iItem-m_nCurrentItem == m_iHotItemID)
				{
					SetHotItem(*(m_pSelItems+i));
					GetParent()->SendMessage(MYWM_LISTOPENEDITEMMOVE, *(m_pSelItems+i));
				}

				// 更新m_pSelItems...
				*(m_pSelItems+i) += iItem-m_nCurrentItem;

			}
		}
		else	// 向下移...
		{
			for (i=m_nSelCount-1; i>-1; i--)
			{
				// 移动列表项...
				CListBox::SetItemData(*(m_pSelItems+i), GetItemData(*(m_pSelItems+i)+iItem-m_nCurrentItem));
				CListBox::SetItemData(*(m_pSelItems+i)+iItem-m_nCurrentItem, (DWORD)(*(m_pSelValues+i)));
				// 改变选定状态...
				SetSel(*(m_pSelItems+i), false);
				SetSel(*(m_pSelItems+i)+iItem-m_nCurrentItem, true);

				// 移动了HotItem...
				if (*(m_pSelItems+i) == m_iHotItemID)
				{
					SetHotItem(*(m_pSelItems+i)+iItem-m_nCurrentItem);
					GetParent()->SendMessage(MYWM_LISTOPENEDITEMMOVE, *(m_pSelItems+i)+iItem-m_nCurrentItem);
				}
				else if(*(m_pSelItems+i)+iItem-m_nCurrentItem == m_iHotItemID)
				{
					SetHotItem(*(m_pSelItems+i));
					GetParent()->SendMessage(MYWM_LISTOPENEDITEMMOVE, *(m_pSelItems+i));
				}

				// 更新m_pSelItems...
				*(m_pSelItems+i) += iItem-m_nCurrentItem;
			}
		}

		// 滚动窗口...
		// ...

		m_nCurrentItem = iItem;
	}
	else
	{
		CListBox::OnMouseMove(nFlags, point);
	}
}

void CMP3ListBox::OnLButtonUp(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	// 按在了选定项，但又没有拖动出该项(拖动操作没有启动)...
	// 模拟正常的鼠标按下效果:只选定该项
	if (m_bMouseDown)
	{
		BOOL bOutside;
		int i=ItemFromPoint(point, bOutside);
		SetSel(-1, false);
		SetSel(i, true);
	}

	if (m_bDragging)
	{
		// 结束拖动...
		m_bDragging = false;

		// 改变mouse指针...

		// 清理工作...
		delete [] m_pSelItems;
		delete [] m_pSelValues;
	}
	m_bMouseDown = false;
	CListBox::OnLButtonUp(nFlags, point);
}