Modeless dialog boxes

Version B

Dialog boxes with desktop's parts.

• Demonstration
• The main window:
  • menu:
    • Exit
    • Dialog Box - creates and shows new modeless dialog box
• Dialog box:
  • modeless
  • resizable
    • change position and/or size of controls according to dialog's size
    • do not let any control to paint on another one
    • use black color for parts of the preview not copied from the desktop (as in the demonstration)
  • preview of desktop window's part
    • initially black (information text is not obligatory)
    • dragging using left mouse button
      • show selection frame (should always be of current preview's size)
      • move the selection frame according to mouse movement (make sure to clean up)
      • show desktop part's under the selection frame in the preview (use black color for parts outside the screen)
  • buttons:
    • Refresh - refreshes the preview (copies desktop part's from the last selected rectangle)
    • Close - closes the dialog box
• Important:
  • do not limit the number of visible dialog boxes
  • make sure that previews on dialog boxes are independent
  • you can assume using only one monitor
  • use WM_DRAWITEM message for drawing of preview (it is obligatory)
  • make sure to free all allocated memory and all created GDI objects
• Hints:
  • CreateDialog()
  • GetDC( NULL )
  • SetROP2()
  • WS_CLIPSIBLINGS, GetWindowLong(), SetWindowLong()
  • WM_DRAWITEM
  • SetCapture(), ReleaseCapture()
  • RedrawWindow()

• Approximate points:
  • menu: 0.5
  • modeless dialog boxes: 1.0
  • resizing the dialog box: 1.5
  • showing desktop's part in the preview: 3.0
  • drawing selection frame during mouse draging: 2.0
  • 'Refresh' button: 1.5
  • 'Close' button: 0.5