1. Chapter 7 Controls

2. Introduction MFC Classic Controls Control Type WNDCLASS MFC Class
Buttons
"BUTTON"
CButton
List boxes
"LISTBOX"
CListBox
Edit controls
"EDIT"
CEdit
Combo boxes
"COMBOBOX"
CComboBox
Scroll bars
"SCROLLBAR"
CScrollBar
Static controls
"STATIC"
CStatic

3. How it works Controls and its parent window Notification Message
When its states change
Example) A button is being clicked
Member Functions of the control
Change or get the state of the control.
Example) Change a button to be inactive
Controls
(Child Window)
Parent Window
① Notification
② function call

4. Button Control Two ways of creating a control
① Create one by hand (coding)
② Create one using the dialog edit window

5. When clicking a button Windows sends Notification Message
Message Handler for the notification
Add message handler MACRO in massage map
Implement the message handler function
Controls
(Child Window)
Parent Window
Notification

6. When changing state of CButton
Call member functions of CButton
Change(Set) the current state
Acquire(Get) the current state
Controls
(Child Window)
Parent Window
function call

7. Member functions of CButton
Change the state of the check box
Check the state of the check box
m_button.SetCheck(BST_CHECKED);
m_button.SetCheck(BST_UNCHECKED);
if ( m_button.GetCheck() == BST_CHECKED )
AfxMessageBox(_T(“Button is checked”));

8. Button Control Two ways of creating a control
① Create one by hand (coding)
② Create one using the dialog edit window

9. Dialog Edit Window Resource View -> Edit “Dialog” Control variables
Creating and designing controls using toolbox
Control variables
Each control can be connected with a control variable.
Call the member functions of the control variable to change/get the state of the control

10. Coding Practice Make a new project of Dialog Based Application
Design the dialog using Dialog Edit Window and tool box

11. Adding Event Message Handler
Use Properties window to add message handlers

12. Adding Event Message Handler Alternative way
In dialog edit window, mouse right button click on a control  Add Event Handler

13. Creating control variables
mouse right button click on a control  Add variables

14. Creating control variables
Added things:
// In Header file
class CTestDlg::public CDiglog {
...
CButton m_button; }
// In Source file
void CTestDlg::DoDataExchange(CDataExchange* pDX)
CFormView::DoDataExchange(pDX);
//{{AFX_DATA_MAP(CExButtonView)
DDX_Control(pDX, IDC_BUTTON1, m_button);
//}}AFX_DATA_MAP

15. Coding Practice
Creating the following program using Dialog based application template
When pushing the button, show the information

16. More Controls

17. Edit Control (1/6)
Edit Control
Line option:

18. Edit Control (1/6)
Properties

19. Edit Control (2/6) Edit Control Style Style Description ES_LEFT
Left-aligns text in the control.
ES_CENTER
Centers text in the control.
ES_RIGHT
Right-aligns text in the control.
ES_AUTOHSCROLL
Permits the edit control to scroll horizontally without a horizontal scroll bar. To add a horizontal scroll bar, include the style WS_HSCROLL.
ES_AUTOVSCROLL
Permits the edit control to scroll vertically without a vertical scroll bar. To add a vertical scroll bar, include the style WS_VSCROLL.
ES_MULTILINE
Creates a multiline edit control.
ES_LOWERCASE
Displays all characters in lowercase.
ES_UPPERCASE
Displays all characters in uppercase.
ES_PASSWORD
Displays asterisks instead of typed characters.
ES_READONLY
Creates an edit control whose text can't be edited.
ES_NOHIDESEL
Prevents the edit control from hiding the selection when the control loses the input focus.
ES_OEMCONVERT
Performs an ANSI-to-OEM-to-ANSI conversion on all characters typed into the control so that the application won't get unexpected results if it performs an ANSI-to-OEM conversion of its own. Obsolete.
ES_WANTRETURN
Programs the Enter key to insert line breaks instead of invoking the default push button for multiline edit controls used in dialog boxes.

20. Edit Control (4/6) Edit Control Notification Messages Notification
Sent When
Message-Map Macro
EN_UPDATE
The control's text is about to change.
ON_EN_UPDATE
EN_CHANGE
The control's text has changed.
ON_EN_CHANGE
EN_KILLFOCUS
The edit control loses the input focus.
ON_EN_KILLFOCUS
EN_SETFOCUS
The edit control receives the input focus.
ON_EN_SETFOCUS
EN_HSCROLL
The edit control is scrolled horizontally using a scroll bar.
ON_EN_HSCROLL
EN_VSCROLL
The edit control is scrolled vertically using a scroll bar.
ON_EN_VSCROLL
EN_MAXTEXT
A character can't be entered because the edit control already contains the number of characters specified with CEdit::LimitText or CEdit::SetLimitText.
ON_EN_MAXTEXT
EN_ERRSPACE
An operation fails because of insufficient memory.
ON_EN_ERRSPACE

21. Coding Practice
Adding Edit Control to the dialog application

22. How to change the state of CEdit
Call member functions of CEdit
Change(Set) the current state
Acquire(Get) the current state
To ways of connecting a control variable with the CEdit Control
By hand (implement in the DoDataExchange function)
An automatic way (add variables  control variable)
Controls
(Child Window)
Parent Window
function call

23. How to change the state of CEdit
Two ways to connect a control variable with the CEdit Control
By hand (implement in the DoDataExchange function)
An automatic way (add variables  control variable)

24. Edit Control (5/6) Inserting and Retrieving Text
Set maximum number of character
Clear, Cut, Copy, Paste and Undo
m_edit.SetWindowText(_T("초기값입니다."));
CString str;
m_edit.GetWindowText(str);
m_edit.SetLimitText(10);
m_edit.Clear();
m_edit.Cut();
m_edit.Copy();
m_edit.Paste();
m_edit.Undo();

25. Edit Control (6/6) Select text for editing Before ① After ① After ②
① m_edit.SelSel(5, 7);
② m_edit.ReplaceSel("ABC");

26. Scroll bar control (1/3)
Scroll bar codes (interfaces)

27. CScrollBar Class(2/3) Member functions Member functions meaning
SetScrollRange()
Set the min and max range of the scroll bar
SetScrollPos()
Set the thumb position
GetScrollPos()
Get the thumb position

28. Scroll bar notification(3/3)
Messages:
Add message MACRO in MessageMap
Scroll Bars have no ID.
Event Message Handler
WM_HSCROLL/ WM_VSCROLL
ON_WM_HSCROLL() or
ON_WM_VSCROLL()
void OnHScroll (UINT nSBCode, UINT nPos, CScrollBar* pScrollBar);
void OnVScroll (UINT nSBCode, UINT nPos, CScrollBar* pScrollBar);

29. Scroll bar message handler (4/3)
WM_HSCROLL/WM_VSCROLL 메시지 핸들러
nSBCode
Scroll bar code (types of event)
nPos
Position of the thumb
Only use when nSBCode is SB_THUMBPOSITION or SB_THUMBTRACK
pScrollBar
Pointer to the scroll bar
void OnHScroll (UINT nSBCode, UINT nPos, CScrollBar* pScrollBar);
void OnVScroll (UINT nSBCode, UINT nPos, CScrollBar* pScrollBar);

30. Coding Practice Add a edit control and scroll bar control
Set the range of the scroll bar to (0, 100)
Show the position value of the thumb in the edit control