Modal dialog boxes

Version A

Transparency of Window

• Demonstration
• The main window:
  • background color - can be changed in settings dialog (default: black)
  • transparency - can be changed in settings dialog (default: 255 - opaque)
  • menu:
    • Exit
    • Settings - accelerators: Ctrl+S and Alt+S
• Settings dialog box:
  • modal
  • buttons:
    • Apply - applies new settings without closing the dialog box
    • OK - closes the dialog box and applies new settings
    • Cancel - closes the dialog box without applying new settings
    • '...' - opens common dialog box for choosing color
  • preview of chosen color
  • horizontal scroll bar - sets opacity of the main window
• Hints:
  • transparency:
    • #define _WIN32_WINNT 0x0500
      before
      #include <windows.h>
    • WS_EX_LAYERED
    • SetLayeredWindowAttributes
  • preview of chosen color
    • static control with SS_BITMAP type (choose Picture Control from Visual Studio's Toolbox and change Type property to Bitmap)
    • create bitmap and set it for the control:
      SendMessage( hCtrl, (UINT)STM_SETIMAGE, IMAGE_BITMAP, (LPARAM)hBmp );
  • DialogBox(), GetDlgItem()
  • ChooseColor(), #include "commdlg.h"

• Approximate points:
  • menu and accelerators: 1.0
  • changing background color of the main window: 1.5
  • changing transparency of the main window: 1.5
  • modal dialog box: 0.5
  • OK, Apply, Cancel buttons functionality: 1.5
  • common dialog for choosing color: 1.0
  • preview of chosen color: 1.5
  • horizontal scroll bar for changing opacity: 1.5