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 Help to modify a control’s behavior by deriving classes of your own from the MFC control classes  Help to build reusable, self-contained control classes that respond to their own notification message  Modify: MFC Control Classes + Control Events  New Style of Controls

 Numeric Edit Controls  Owner-Draw List Boxes  Graphical Push Buttons  Customizing a Control’s Colors

 A normal edit control accepts a wide range of characters, including numbers, letters of the alphabet, and punctuation symbols.  A numeric edit control accepts only numbers. It's perfect for entering phone numbers, serial numbers, IP addresses, and other numeric data.

 Example : Create an edit control which allows user input Student ID and the length must be 7 characters.

 Step 1 : New a class name : CNumEdit that is derived from MFC Classes CEdit

 When an edit control has the input focus and a character key is pressed, the control receives a WM_CHAR message.

 Step 2: Code in OnChar function to make the constrains

 Step 3 : Create variable for a object from class CNumEdit in class Dialog

 Transfer of data between a control in a dialog box and a data member.  Result in running:

 By default, items in a list box consist of strings of text. Should you need a list box that displays graphical images instead of text, you can create an owner-draw list box—one whose contents are drawn by your application, not by Windows—by following two simple steps. ◦ Derive a new list box class from CListBox, and override CListBox::MeasureItem and CListBox::DrawItem. Also override PreCreateWindow, and make sure that either LBS_OWNERDRAWFIXED or LBS_OWNERDRAWVARIABLE is included in the list box style. ◦ Instantiate the derived class, and use Create or CreateEx to create the list box.

 Example: Create a Graphical ListBox and show the Graphical Image when choose a Item in ListBox

 Step 1: Design the Dialog with a ListBox and Picture Control  Remember : in the ListBox ◦ Owner Draw : Variable ◦ Has strings : Check

 Step 2 : In Resource Tab. Insert Bitmap and remember these bitmap ID for later using

 Choose a series of bmp Image in your Drives

 Step 3: Create a new class COwnerDrawListBox to customize your ListBox

 Add needed functions into the class

 Make the code to customize the ListBox

 Step 4: Add a object variable from COwnerDrawListBox into Class Dialog and make the transfer of data.

 OnInitDialog : I do AddItem into Custom ListBox

 Step 5: When Choose a Item In ListBox. Image will be showed. Remember Event LBN_SELCHANGE for ListBox

 Create control variable m_samplePic for Picture control and :

 Result :

 Two button styles that were first introduced in Windows 95—BS_BITMAP and BS_ICON— make graphical push buttons a breeze by taking a single image and creating a push button from it.  A BS_BITMAP-style push button (henceforth, a bitmap push button) displays a bitmap on the face of a push button.  A BS_ICON-style push button (an icon push button) displays an icon.

 Example : change the button OK and Cancel into Graphical ones  Step 1: Insert new Icons into resource

 Step 2: Change the properties of two button and add control valuable for them

 Step 3: Make the code change apperance of OK and Cancel button in OnInitDialog

 MFC supports two mechanisms for changing a control's colors. Both rely on the fact that before a control paints itself, it sends its parent a message containing the handle of the device context used to do the painting.  The parent can call CDC::SetTextColor and CDC::SetBkColor on that device context to alter the attributes of any text drawn by the control. It can also alter the control's background color by returning a brush handle (HBRUSH).

 Example : Change the background and text of input Name value for Edit Box  Step 1: Create Class CEditColor Derived from CEdit and Add variable about color and function ton change them into class

 Remember : Event WM_CTLCOLOR

 Step 2: Make the Transfer Data and change color in OnInitDialog

 Result :