Advanced MFC Programming

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Chapter 11. Sample: Simple Paint case default function CBitmapButton::DrawItem(…) will be called). If we do not override this function, we will not be notified when buttons need to be updated. Since this sample is supposed to be used for palette device (Of course, it can be run on a non-palette device), we will let each button display a color contained in a different entry of the logical palette. In order to do this, we should let different button have a different index that represents a different entry of the logical palette. For this purpose, a variable m_nPalIndex and two functions (GetPaletteIndex() and SetPaletteIndex(…)) are added to class CColorButton. In function CColorButton::DrawItem(…), this value is used as the index to the application’s logical palette for button drawing: …… …… else { pDC=CDC::FromHandle(lpDrawItemStruct->hDC); pPalOld=pDC->SelectPalette(pPal, FALSE); pDC->RealizePalette(); pDC->FillSolidRect ( &lpDrawItemStruct->rcItem, PALETTEINDEX(m_nPalIndex) ); pDC->SelectPalette(pPalOld, FALSE); } We use macro PALETTEINDEX to retrieve the actual color contained in the palette entry. As usual, before doing any drawing, we have to select the logical palette into the DC and realize it. Class CFBButton is similar. Two variables m_BgdIndex and m_FgdIndex are added to class CGDIDoc representing the currently selected foreground and background colors. Their values can be retrieved and set through calling functions CGDIDoc::GetBgdIndex(), CGDIDoc::GetFgdIndex(), CGDIDoc:: SetBgdIndex(…), CGDIDoc::SetFgdIndex(…). Two variables are declared in the document class instead of color bar class because their values may need to be accessed from the view. Since the document is the center of the application, we should put the variables in the document so that they can be easily accessed from other classes. Function CFBButton::Drawitem(…) implements drawing a rectangle filled with current background color overlapped by another rectangle filled with current foreground color. Like class CColorButton, the color is retrieved from the logical palette contained in the document. The following code fragment shows how the background rectangle is drawn: …… …… brush.CreateSolidBrush(PALETTEINDEX(nBgdIndex)); rect=lpDrawItemStruct->rcItem; rect.InflateRect(-2, -2); rect.left+=rect.Width()/4; rect.top+=rect.Height()/4; pBrOld=pDC->SelectObject(&brush); pDC->Rectangle(rect); pDC->DrawEdge(rect, EDGE_ETCHED, BF_RECT); pDC->SelectObject(pBrOld); Variable nBgdIndex is an index to the logical palette, the whole area that needs to be painted is specified by lpDrawItemStruct->rcItem (lpDrawItemStruct is the pointer passed to function DrawItem(…)). When drawing the rectangle, we see that a margin of 2 is left first (This is done through calling function CRect:: InflateRect(…)), then the width and height of the rectangle are set to ¾ of their original values. The foreground rectangle has the same dimension, but overlaps the background rectangle. To add more fluff to the application, the border of both rectangles has a 3D effect, which is implemented by calling function CDC::DrawEdge(…). 340
Chapter 11. Sample: Simple Paint Color Bar To implement color bar, a new class derived from CDialogBar is added to the application. This class is named CColorBar. To let the buttons act as color selection controls, we need to implement subclass for all the owner-draw buttons. In the sample, function CColorBar::InitButtons() is added to initialize the indices of all the buttons and implement subclass. Also, function CDialogBar::Create(…) is overridden, within which CColorBar::InitButtons() is called to change the default properties of the buttons. The following is the implementation of function CColorBar::InitButtons(): BOOL CColorBar::InitButtons() { int i; } for(i=0; i
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Advanced MFC Programming Supporting
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Checking a Menu Item 2.2 Right Clic
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Trapping Double Clicking Message Re
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COMMON DIALOG BOXES 7.1 File Open a
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9.1 Outputting Text Using Different
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Summary SAMPLE: SIMPLE PAINT 11.0 P
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13.2 Creating Applications without
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Functions Implementing Comparisons
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Chapter 1. Tool Bar and Dialog Bar
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Chapter 2. Menu Chapter 2 Menu Menu
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Chapter 2. Menu ON_COMMAND(ID_EDIT_
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Chapter 2. Menu “clipboard”. We
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Chapter 2. Menu Using Class CMenu W
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Chapter 2. Menu } After implementin
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Chapter 2. Menu ); UINT nPosition,
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Chapter 2. Menu void CMenuDoc::OnEd
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Chapter 2. Menu } In the sample, bi
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Chapter 3. Splitter Window Chapter
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Chapter 3. Splitter Window function
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Chapter 3. Splitter Window BOOL CSp
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Chapter 3. Splitter Window In the a
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Chapter 3. Splitter Window Sample S
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Chapter 3. Splitter Window WM_LBUTT
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Chapter 4. Button Chapter 4 Buttons
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Chapter 4. Button Use string text a
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Chapter 4. Button Now we can remove
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Chapter 4. Button } ( m_bBmpCheck ?
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Chapter 4. Button using bit-wise AN
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Chapter 4. Button Overriding Functi
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Chapter 4. Button …… First pBit
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Chapter 4. Button Using Class MCBit
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Chapter 4. Button The button’s ID
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Chapter 4. Button However, since me
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Chapter 5. Common Controls command
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Chapter 5. Common Controls ((CSpinB
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Chapter 5. Common Controls button
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Chapter 5. Common Controls (CBN_CLO
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Chapter 5. Common Controls } ptrEdi
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Chapter 5. Common Controls void CWn
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Chapter 5. Common Controls typedef
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Chapter 5. Common Controls Paramete
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Chapter 5. Common Controls void MCT
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Chapter 5. Common Controls In funct
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Chapter 5. Common Controls m_tabCtr
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Chapter 5. Common Controls Custom R
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Chapter 6. Dialog Box Chapter 6 Dia
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Chapter 6. Dialog Box void CMLDialo
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Chapter 6. Dialog Box } Function CP
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Chapter 6. Dialog Box Everything is
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Chapter 6. Dialog Box } MINMAXINFO;
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Chapter 6. Dialog Box Sample Sampel
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Chapter 6. Dialog Box } brush=(HBRU
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Chapter 6. Dialog Box wndA.GetWindo
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Chapter 6. Dialog Box rectStaticGrp
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Chapter 6. Dialog Box } TOOLTIPTEXT
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Chapter 6. Dialog Box ) { } if ( )
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Chapter 6. Dialog Box pWndCtrl=GetW
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Chapter 6. Dialog Box Sample 6.8-2\
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Chapter 6. Dialog Box } // handle t
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Chapter 6. Dialog Box 1) Tracking s
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Chapter 7. Common Dialog Boxes DWOR
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Chapter 7. Common Dialog Boxes dial
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Chapter 7. Common Dialog Boxes Stc3
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Chapter 7. Common Dialog Boxes DWOR
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Chapter 7. Common Dialog Boxes Comm
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Chapter 7. Common Dialog Boxes Retr
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Chapter 7. Common Dialog Boxes 7.9
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Chapter 8. DC, Pen, Brush and Palet
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Chapter 9. Font Here, member lfFace
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Chapter 9. Font int CALLBACK EnumFo
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Chapter 9. Font }; Variable m_nRang
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Chapter 9. Font CFont *ptrFont; if(
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Chapter 9. Font POINT pt; CClientDC
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Chapter 9. Font } if(dlg.DoModal()
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Chapter 9. Font …… } nKeyState=
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Chapter 9. Font To check out if the
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Chapter 9. Font the same, it indica
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Chapter 9. Font } if(m_nSelIndexBgn
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Chapter 9. Font GHND GPTR Same with
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Chapter 9. Font Function CDocument:
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Chapter 9. Font …… void CGDIDoc
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Chapter 9. Font …… { } UpdateAl
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Chapter 10. Bitmap ); DWORD dwRop T
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Chapter 10. Bitmap Sample 10.1-2\GD
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Chapter 10. Bitmap The next part of
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Chapter 13. Adding Special Features
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Chapter 14. Views ID_EDIT_PASTE pas
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Chapter 14. Views szFind=newName; s
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Chapter 14. Views ON_COMMAND(ID_BUT
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Chapter 14. Views IDB_BITMAP_CLOSEF
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Chapter 14. Views Because we do not
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Chapter 14. Views For the root dire
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Chapter 14. Views …… …… if(
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Chapter 14. Views void CDirView::Ad
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Chapter 14. Views Actually, in the
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Chapter 14. Views } if(szName1.GetL
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Chapter 14. Views Mouse Cursor Coor
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Chapter 16. Context Sensitive Help
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Appendix A. Virtual-key Codes Appen
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Appendix A. Virtual-key Codes Funct
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Appendix B. Ternary Raster Operatio
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Index Index #if, 416 #pragma, 416 .
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Index CDC::SetPixel, 321 CDC::SetRO
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Index CRectTracker, 345 CRectTracke
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Index CWnd::SetMenu, 55 CWnd::SetTi
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Index HBRUSH, 201 HCURSOR, 262 HDAT
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Index Background palette, 224 Chang
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Index Default tool bar, 1 Enable or
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