COP4226, Review Topics

These are the topics that I covered in the first half of the semester

• Windows Messages
  • WM_LBUTTONDOWN, WN_LBUTTONUP, WM_RBUTTONDOWN
  • WM_CREATE, WM_CLOSE, WM_COMMAND
• GDI and device independence
• Resource based programming
• OnDraw
  • pDC->TextOut(0, 0, "Hello, World");
  • pDC->SelectStockObject(GRAY_BRUSH);
  • pDC->Ellipse(CRect(0,20,100,120);
• TRACE - like printf
• Message mapping
  • afx_msg - "no-op" prototype for message map function
  • In.cpp file
    BEGIN_MESSAGE_MAP
ON_WM_LBUTTONDOWN()
ON_BTN_CLICKED(IDC_OK, OnClickedOK)
END_MESSSAGE_MAP
  • In .h file
    afx_msg void OnLButtonDown(UINT nFlags, CPoint point);
afx_msg void OnClickedOk();
DECLARE_MESSAGE_MAP()
• Using member variables to save the view's state
• Invlidate() vs. InvalidateRect()
• CRect, CPoint, CSize and their arithmetic operators
• Testing if a point is in a rectangle
• Mapping Modes
  • fixed: MM_TEXT, MM_HIENGLISH, MM_LOENGLISH, MM_HIMETRIC, MM_LOMETRIC, MM_TWIPS
  • variable: MM_ISOTROPIC, MM_ANISOTROPIC
  • SetWindowExt, SetViewportExt are used to set the scale.
  • Mapping the entire client area
    GetClientRect(rectClient);
pDC->SetMapMode(MM_ANISOTROPIC);
pDC->SetWindowExt(1000, 1000);
pDC->SetViewPortExt(rectClient.right, -rectClient.bottom);
pDC->SetViewPortOrg(rectClient.right / 2, rectClient.bottom / 2);
• Converting between device and logical coordinates
• Scroll View
  • OnInitialUpdate - set scroll parameters
  • sizeTotal, sizePage, sizeLine
• Accepting keyboard input for scroll bars
  • WM_CHAR
  • WM_KEYDOWN
  • OnKeyDown
  • VK_HOME, VK_END, VK_UP, VK_DOWN,
  • VK_PRIOR, VK_NEXT, VK_LEFT, VK_RIGHT
• OnVScroll, OnHScroll
  • SB_TOP, SB_BOTTOM, SB_LEFT, SB_RIGHT
  • SB_LINEUP, SB_LINEDOWN, SB_LINERIGHT, SB_LINELEFT
  • SB_PAGEUP, SB_PAGEDOWN, SB_PAGERIGHT, SB_PAGELEFT
• GDI classes
  • CPen
  • CBrushe
  • CFont
  • CBitmap
  • CRgn
• Selecting a GDI object into the device context
  • pDC->SelectObject(&pen);
  • pDC->SelectStockObject(GRAY_BRUSH);
• Create GDI objects on the stack, deselect them to avoid memory leaks
• GetDeviceCaps
  • LOGPIXELSX
  • LOGPIXELSY
• GetTextMetrics
  • tmExternalLeading, tmHeight, tmInternalLeading
• Device Context member functions
  • pDC->SetBkColor(RGB((255,0,0))
  • pDC->SetTextColor(RGB((255,0,255))
  • pDC->Rectangle(rectTemp)
  • pDC->GetTextExtent(strText)
• Dialogs: modal vs modeless
• Control classes in dialogs
  • CEdit
  • CButton
  • CComboBox
    • Simple
    • Dropdown
    • Droplist
  • CListBox
  • CSScrollBar
  • CStatic
• Create a class for a dialog
  • Create member variables for each control
  • Create message maps for buttons
• Special Initialization inOnInitDialog
  • Insert list box items
    CListBox* pLB = (CListBox*) GetDlgItem(IDC_LISTBOX);
pLB->InsertString9-1, "Documentation");
  • Call the base class OnInitDialog after initialization
• Connecting the view and the dialog
  • dialog member variable in the view
  • UpdateData(TRUE) to get dat from controls to the class
  • UpdateData(FALSE) to get the data from the class to the controls
  • DoModal does both UpdateData calls
  • DoDataExchange
• Preventing ENTER and ESC to close the dialog
• Identifying controls
  • GetDlgItem(IDC_DATA)
  • pWnd->GetDlgCtrlID()
• Setting the background color of a control
  • OnCtlColor
  • HBRUSH m_bYellow
  • m_bYellow = CreateSolidBrush(RGB(0,255,255));
  • return a brush from the function
• CFontDialog, CFileDialog: how to call them.
• User defined messages
  • PostMessage - on queue
  • SendMessage - immediate
  • Add message mapping
    • Begin(.cpp): ON_MESSAGE(WM_GOODBYE, OnGoodbye)
    • Declare (.h): afx_msg LRESULT OnGoodbye(WPARAM wParam, LPARAM lParam)
• Modeless Dialog
  • Overload constructor with pointer to view, so dialog knows which view gets the message
  • Overload the Create function. Call the base class Create with the IDD of the Dialog
  • DestroyWindow to kill the dialog
  • Override the OnOK and OnCancel handlers to post the message to the view
  • Create dialog in constructor, delete it in the destructor
• Bitmaps
  • Bitmaps are like other GDI objects
  • Display surface is bitmap associated with device context
  • Must copy other bitmaps into the display bitmap
    Create bitmap: CBitmap bitmap;
    Create dc: CDC dcMemory;
    Load bitmap: bitmap.LoadBitmap(IDB_REDBLOCKS);
    Select bitmap: dcMemory.SelectObject(&bitmap);
    Copy bitmap: pDC->BitBlt(100, 100, 54, 96, &dcMemory, 0, 0, SRCCOPY);
  • To map pixels exaclty, use StretchBlt
    CSize(54, 96);
pDC->DPtoLP(&size);
pDC->StretchBlt(100, 100, size.cx, -size.cy, &dcMemory, 0, 0, 54, 96, SRCCOPY);