Dialog box & controls

Owner-draw combo-box

• Demonstration
• Description:
  • combo-box with 4 items (items' texts are "Color X" where X are in 0-3 range)
  • 3 vertical scroll-bars to define currently selected combo-box item's background color
  • "Close" button - closes application
• Functionality:
  • dialog-box is a main window (no additional window is allowed)
  • there should be no possibility to type text inside the combo-box
  • all the scroll-bars have value range 0-255
  • each scroll-bar define one color channel (red, green, blue)
  • color for each item is defined independently
  • selecting the combo-box's item has to update scroll-bars' positions
  • currently selected combo-box item's color is updated when position of any scroll-bar is changed
  • a "line" change of scroll-bars shoud be set as 1 and a "page" one as 10 units
  • color should be changed when scroll-bar is tracking also
  • item's height is 14 px.
  • backgrounds of all the items should fill whole control's area (no white line between items is allowed)
  • currently selected item should have a red border
• Hints:
  • DialogBox(), EndDialog()
  • GetScrollPos(), SetScrollPos(), SetScrollRange()
  • GetDlgItem(), CBN_SELCHANGE
  • WM_MEASUREITEM, WM_DRAWITEM
  • SetBkMode(), SetTextColor()
• Approximate points:
  • dialog box as an application's main window: 2.0
  • dialog closing (both button "Close" and "X" in the titlebar): 0.5
  • scroll-bars range and position change: 1.5
  • scroll-bars tracking: 1.0
  • items backgrounds' color and height: 3.0
  • scroll-bars position update on selected item change: 1.5
  • red border for selected item: 0.5

• Links for uploading:
  • Solutions
  • Corrections