Simple self-plotting clistbox, overloaded virtual MeasureItem and DrawItem, two virtual functions

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2. For example Cnewlistbox inherits from CListBox, overloads virtual MeasureItem and DrawItem two virtual functions, the code is as follows:
6. void Cnewlistbox::D rawitem (lpdrawitemstruct lpdrawitemstruct)
8. {
10. //Todo:add your code to draw the specified item
12. ASSERT (Lpdrawitemstruct->ctltype = = Odt_listbox);
14. LPCTSTR LpszText = (lpctstr) lpdrawitemstruct->itemdata;
16. ASSERT (LpszText! = NULL);
18. CDC DC;
22. dc. Attach (LPDRAWITEMSTRUCT->HDC);
26. //Save These value to restore them when do drawing.
28. colorref Croldtextcolor = DC.  GetTextColor ();
30. colorref Croldbkcolor = DC.  GetBkColor ();
34. //If This item is selected, set the background color
36. //And the text color to appropriate values. Also, Erase
38. //Rect by filling it with the background color.
40. if (lpdrawitemstruct->itemaction | Oda_select) &&
42. (Lpdrawitemstruct->itemstate & ods_selected))
44. {
46. dc. SetTextColor (:: GetSysColor (Color_highlighttext));
48. dc. SetBkColor (:: GetSysColor (Color_highlight));
50. dc. Fillsolidrect (&lpdrawitemstruct->rcitem,
52. :: GetSysColor (Color_highlight));
54. }
56. Else
58. {
60. if (lpdrawitemstruct->itemid%2)
62. dc. Fillsolidrect (&lpdrawitemstruct->rcitem, RGB (128,128,128));
64. Else
66. dc. Fillsolidrect (&lpdrawitemstruct->rcitem, RGB (255,128,255));
68. }
72. //If This item has the focus, draw a red frame around the
74. //Item ' s rect.
76. if (lpdrawitemstruct->itemaction | Oda_focus) &&
78. (Lpdrawitemstruct->itemstate & Ods_focus))
80. {
82. CBrush BR (RGB (0, 0, 128));
84. dc. Framerect (&lpdrawitemstruct->rcitem, &BR);
86. }
88. Lpdrawitemstruct->rcitem.left + = 5;
90. //Draw the text.
92. dc. DrawText (
94. LpszText,
96. Strlen (LpszText),
98. &lpdrawitemstruct->rcitem,
100. Dt_left| dt_singleline| Dt_vcenter);
104. //Reset the background color and the text color back to their
106. //Original values.
108. dc. SetTextColor (Croldtextcolor);
110. dc. SetBkColor (Croldbkcolor);
114. dc. Detach ();
116. }
120. void Cnewlistbox::measureitem (Lpmeasureitemstruct lpmeasureitemstruct)
122. {
124. //Todo:add your code to determine the size of specified item
126. ASSERT (Lpmeasureitemstruct->ctltype = = Odt_listbox);
128. LPCTSTR LpszText = (lpctstr) lpmeasureitemstruct->itemdata;
130. ASSERT (LpszText! = NULL);
132. CSize sz;
134. cdc* PDC = GetDC ();
138. SZ = pdc->gettextextent (LpszText);
142. ReleaseDC (PDC);
146. Lpmeasureitemstruct->itemheight = 2*sz.cy;
148. }
152. Where M_listbox is an object of type Cnewlistbox
154. #define Idc_listbox 0x1101
158. M_listbox.create (ws_child| ws_visible| ws_border| ws_vscroll| ws_hscroll|
160. lbs_ownerdrawvariable, CRect (0, 0, 380, 280), this , Idc_listbox);

As shown below:

http://blog.csdn.net/visualeleven/article/details/5935430

Simple self-plotting clistbox, overloaded virtual MeasureItem and DrawItem, two virtual functions