1. Chapter 5 The MFC Collection Classes

2. MFC Container Class
CArray
CList
CVector
CMap

3. Linked List Good: Easy to add or delete data
Bad: Only sequential access to the data is possible

4. CList Linked List Template Class by MFC Create a variable:
CList < datatype > a;
Add Data:
CList::AddTail(..)
CList::AddHead(..)
Delete Data:
CList::RemoveTail();
CList::RemoveHeat();
CList::RemoveAt(..)
Example:
CList < int > a;
Add data:
CList::AddTail(3)
CList::AddHead(4)
Delete Data:
CList::RemoveTail();
CList::RemoveHeat();
CList::RemoveAt(..)
iterator:
POSITION

5. Iterator Access to an item in the Container (== pointer)
iterator datatype in MFC : POSITION
CList <int> a;
a.AddTail(10);
a.AddTail(20);
a.AddTail(30);
POSITION pos = a.GetHeadPosition(); // Return the first data
while(pos != NULL) // position {
int value = a.GetNext(pos); // Return data at pos
// pos indicate the next }

6. Insertion // Add at front CList::AddHead( value ) // Add at back
CList::AddTail( value )
// Add at the given position
CList::InsertAfter (POSITION, value)

7. Retrieval/Modification
// Get value
value = CList::GetAt( POSITION )
// Get reference
value & = CList::GetAt( POSITION )
CList <int> a;
a.AddHead(10);
a.AddHead(20);
a.AddHead(30);
POSITION pos;
pos = a.GetHeadPosition();
int b = a.GetAt(pos); // value
int &c = a.GetAt(pos); // reference

8. Removal // Delete the frist CList::RemoveHead( ) // Delete the end
CList::RemoveTail( )
// Delete at the position
CList::RemoveAt(POSITION)
// Delete all
CList::RemoveAll( )

9. Coding Practice Draw points with mouse left dragging.
Delete points with mouse right dragging
Draw Points with mouse left dragging
Set a rectangle
By mouse right dragging
Delete points inside the rectangle

10. Coding Practice 2 Draw curves with mouse left dragging.
Each curve should be separated

11. Back to MENU – Chapter 4

12. Chapter 4-3: Menu Magic 2 Ways for creating a menu:
Use the Resource view
Use CMenu class and create it manually

13. Create a menu using CMenu class
Design a popup menu
Add(attach) the popup menu to the main menu
2. Add it to the main menu
1. Design a popup menu

14. Procedure Design a popup menu Attach it to the main menu
Create a new PopupMenu: CreatePopupMenu()
Adding menu items to the menu: AppendMenu()
Attach it to the main menu
Get the main menu: GetMenu()
Attach a menu to the existing menu: AppendMenu()

15. Coding practice In the CMainFrame::OnCreate function
int CMainFrame::OnCreate(LPCREATESTRUCT lpCreateStruct) {
// … ...
CMenu Popup;
Popup.CreatePopupMenu();
Popup.AppendMenu(MF_STRING, 201, “Red(&R)");
Popup.AppendMenu(MF_STRING, 202, “Green(&G)");
Popup.AppendMenu(MF_STRING, 203, “Blue(&B)");
CMenu * pMenuMain = GetMenu();
pMenuMain->AppendMenu(MF_POPUP, (UINT_PTR) Popup.Detatch(), “Color(&C)”); }

16. Summary CMenu class: store the menu properties
AppendMenu() member function
Flag:
MF_STRING (when adding a normal menu item)
MF_POPUP (when attaching a popup menu)
MF_SEPARATOR
ID:
In case of MF_STRING : Command ID
In case of MF_POPUP : Pointer to the popup menu (use CMenu::Detatch() function)
bool CMenu::AppendMenu( Flag, ID, Caption )

17. Context menu
Context menu

18. Context menu message handler
1. When click the mouse right button or key
2. Windows sends WM_CONTEXTMENU message
3. Add the message handler

19. Prototype of the handler
WM_CONTEXTMENU message handler
pWnd – window where the mouse cursor is located
pos – the position of the mouse cursor
afx_msg void OnContextMenu (CWnd* pWnd, CPoint pos) ;

20. Coding Practice Add the WM_CONTEXTMENU handler
AfxMessageBox(_T(“Context Menu”));

21. Show the menu in the handler
Use CMenu::TrackPopupMenu() function
nFlags
TPM_LEFTALIGN, TPM_CENTERALIGN, TPM_RIGHTALIGN
TPM_LEFTBUTTON, TPM_RIGHTBUTTON
BOOL TrackPopupMenu (UINT nFlags, int x, int y, CWnd* pWnd, LPCRECT lpRect = 0) ;

22. Show the menu in the handler
Use CMenu::TrackPopupMenu() function
x, y
Position where the menu will be located(스크린 좌표)
pWnd
Window which will get the WM_COMMAND message
Usually use AfxGetMainWnd() function to get the CMainFrame
lpRect
The rectangle region of the menu. Give 0 usually.
BOOL TrackPopupMenu (UINT nFlags, int x, int y, CWnd* pWnd, LPCRECT lpRect = 0) ;

23. An example to show the context menu
Create a menu and show it:
void CChildView::OnContextMenu(CWnd* pWnd, CPoint point) {
CMenu menuPopup;
menuPopup.CreatePopupMenu();
menuPopup.AppendMenu(MF_STRING, 201, "Red (&R)");
menuPopup.AppendMenu(MF_STRING, 202, "Green (&G)");
menuPopup.AppendMenu(MF_STRING, 203, "Blue (&B)");
menuPopup.TrackPopupMenu(
TPM_LEFTALIGN|TPM_LEFTBUTTON,
point.x, point.y,
AfxGetMainWnd()); }

24. More example Using existing menu as a context menu
void CChildView::OnContextMenu(CWnd* pWnd, CPoint point) {
CMenu menu;
menu.LoadMenu(IDR_MAINFRAME);
CMenu* pMenu = menu.GetSubMenu(4);
pMenu->TrackPopupMenu(
TPM_LEFTALIGN|TPM_RIGHTBUTTON,
point.x, point.y, AfxGetMainWnd()); }