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1.1 root 1: // custlist.cpp : custom listbox
2: //
3: // This is a part of the Microsoft Foundation Classes C++ library.
4: // Copyright (C) 1992 Microsoft Corporation
5: // All rights reserved.
6: //
7: // This source code is only intended as a supplement to the
8: // Microsoft Foundation Classes Reference and Microsoft
9: // QuickHelp documentation provided with the library.
10: // See these sources for detailed information regarding the
11: // Microsoft Foundation Classes product.
12:
13: #include "ctrltest.h"
14:
15: /////////////////////////////////////////////////////////////////////////////
16: // Custom Listbox - containing colors
17:
18: class CColorListBox : public CListBox
19: {
20: public:
21: // Operations
22: void AddColorItem(COLORREF color);
23:
24: // Implementation
25: virtual void MeasureItem(LPMEASUREITEMSTRUCT lpMIS);
26: virtual void DrawItem(LPDRAWITEMSTRUCT lpDIS);
27: virtual int CompareItem(LPCOMPAREITEMSTRUCT lpCIS);
28: };
29:
30: void CColorListBox::AddColorItem(COLORREF color)
31: {
32: // add a listbox item
33: AddString((LPCSTR) color);
34: // Listbox does not have the LBS_HASSTRINGS style, so the
35: // normal listbox string is used to store an RGB color
36: }
37:
38: /////////////////////////////////////////////////////////////////////////////
39:
40: #define COLOR_ITEM_HEIGHT 20
41:
42: void CColorListBox::MeasureItem(LPMEASUREITEMSTRUCT lpMIS)
43: {
44: // all items are of fixed size
45: // must use LBS_OWNERDRAWVARIABLE for this to work
46: lpMIS->itemHeight = COLOR_ITEM_HEIGHT;
47: }
48:
49: void CColorListBox::DrawItem(LPDRAWITEMSTRUCT lpDIS)
50: {
51: CDC* pDC = CDC::FromHandle(lpDIS->hDC);
52: COLORREF cr = lpDIS->itemData; // RGB in item data
53:
54: if (lpDIS->itemAction & ODA_DRAWENTIRE)
55: {
56: // Paint the color item in the color requested
57: CBrush br(cr);
58: pDC->FillRect(&lpDIS->rcItem, &br);
59: }
60:
61: if ((lpDIS->itemState & ODS_SELECTED) &&
62: (lpDIS->itemAction & (ODA_SELECT | ODA_DRAWENTIRE)))
63: {
64: // item has been selected - hilite frame
65: COLORREF crHilite = RGB(255-GetRValue(cr),
66: 255-GetGValue(cr), 255-GetBValue(cr));
67: CBrush br(crHilite);
68: pDC->FrameRect(&lpDIS->rcItem, &br);
69: }
70:
71: if (!(lpDIS->itemState & ODS_SELECTED) &&
72: (lpDIS->itemAction & ODA_SELECT))
73: {
74: // Item has been de-selected -- remove frame
75: CBrush br(cr);
76: pDC->FrameRect(&lpDIS->rcItem, &br);
77: }
78: }
79:
80: int CColorListBox::CompareItem(LPCOMPAREITEMSTRUCT lpCIS)
81: {
82: COLORREF cr1 = lpCIS->itemData1;
83: COLORREF cr2 = lpCIS->itemData2;
84: if (cr1 == cr2)
85: return 0; // exact match
86:
87: // first do an intensity sort, lower intensities go first
88: int intensity1 = GetRValue(cr1) + GetGValue(cr1) + GetBValue(cr1);
89: int intensity2 = GetRValue(cr2) + GetGValue(cr2) + GetBValue(cr2);
90: if (intensity1 < intensity2)
91: return -1; // lower intensity goes first
92: else if (intensity1 > intensity2)
93: return 1; // higher intensity goes second
94:
95: // if same intensity, sort by color (blues first, reds last)
96: if (GetBValue(cr1) > GetBValue(cr2))
97: return -1;
98: else if (GetGValue(cr1) > GetGValue(cr2))
99: return -1;
100: else if (GetRValue(cr1) > GetRValue(cr2))
101: return -1;
102: else
103: return 1;
104: }
105:
106: /////////////////////////////////////////////////////////////////////////////
107: // Dialog class
108:
109: class CCustListDlg : public CModalDialog
110: {
111: protected:
112: CColorListBox m_colors;
113: public:
114: CCustListDlg()
115: : CModalDialog(IDD_CUSTOM_LIST)
116: { }
117:
118: // access to controls is through inline helpers
119: BOOL OnInitDialog();
120: void OnOK();
121: DECLARE_MESSAGE_MAP();
122: };
123:
124: BEGIN_MESSAGE_MAP(CCustListDlg, CModalDialog)
125: ON_LBN_DBLCLK(IDC_LISTBOX1, OnOK) // double click for OK
126: END_MESSAGE_MAP()
127:
128: BOOL CCustListDlg::OnInitDialog()
129: {
130: // subclass the control
131: VERIFY(m_colors.SubclassDlgItem(IDC_LISTBOX1, this));
132:
133: // add 8 colors to the listbox (primary + secondary color only)
134: for (int red = 0; red <= 255; red += 255)
135: for (int green = 0; green <= 255; green += 255)
136: for (int blue = 0; blue <= 255; blue += 255)
137: m_colors.AddColorItem(RGB(red, green, blue));
138:
139: return TRUE;
140: }
141:
142: void CCustListDlg::OnOK()
143: {
144: // get the final color
145: int nIndex = m_colors.GetCurSel();
146: if (nIndex == -1)
147: {
148: MessageBox("Please Select a Color");
149: m_colors.SetFocus();
150: return;
151: }
152: DWORD color = m_colors.GetItemData(nIndex);
153:
154: #ifdef _DEBUG
155: // normally do something with it...
156: TRACE("final color RGB = 0x%06lX\n", color);
157: #endif
158:
159: EndDialog(IDOK);
160: }
161:
162: /////////////////////////////////////////////////////////////////////////////
163: // Run the test
164:
165: void CTestWindow::OnTestCustomList()
166: {
167: TRACE("running dialog with custom listbox (owner draw)\n");
168: CCustListDlg dlg;
169: dlg.DoModal();
170: }
171:
172: /////////////////////////////////////////////////////////////////////////////
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