Advanced MFC Programming

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Chapter 7. Common Dialog Boxes } szStrRGB.Format ( "\n\tColor(%d) R=%d, G=%d, B=%d", i, (int)GetRValue(color[i]), (int)GetGValue(color[i]), (int)GetBValue(color[i]) ); szStr+=szStrRGB; } AfxMessageBox(szStr); } We first create a color dialog box and use colorInit to initialize the selected color. Like OPENFILENAME, structure CHOOSECOLOR also has a Flags member that can be used to set the styles of color dialog box. In the above function new flags contained in parameter dwFlags are added to the default flags through bit-wise OR operation. Variable color is a COLORREF type array with a size of 16. We use a loop to fill each of its elements with a different color and pass the address of the array to member lpCustColors of structure CHOOSECOLOR. After calling CColorDialog::DoModal(), function CColorDialog::GetColor() is called to retrieve the selected color, whose RGB values are displayed in a message box. Besides this, the RGB values of custom colors are also displayed. In the sample, a new sub-menu Color Dialog Box is added to IDR_MAINFRAME menu, and a command Color Dialog Box | Initialize is created. The ID of this command is ID_COLORDIALOGBOX_INITIALIZE, also, a WM_COMMAND message handler CCDBDoc::OnColordialogboxInitialize() is added through using Class Wizard. The following is the implementation of this command: void CCDBDoc::OnColordialogboxInitialize() { ColorDialog(RGB(255, 0, 0)); } The selected color is initialized to red, and no additional styles are specified. Full Open Now we are going to customize the styles of color dialog box. First, we can create a fully opened dialog box by setting CC_FULLOPEN bit for member Flags of CHOOSECOLOR structure. Also, we can prevent the dialog from being fully opened by setting CC_PREVENTFULLOPEN bit. In the sample, two menu commands Color Dialog Box | Disable Full Open and Color Dialog Box | Full Open are added, in their corresponding message handlers, the color dialog boxes with different styles are implemented: void CCDBDoc::OnColordialogboxDisablefullopen() { ColorDialog(RGB(0, 255, 0), CC_PREVENTFULLOPEN); } void CCDBDoc::OnColordialogboxFullopen() { ColorDialog(RGB(0, 255, 0), CC_FULLOPEN); } Now we can compile the application and try color dialog boxes with different styles. 7.6 Custom Dialog Box Template Like file dialog box, we can use our own dialog template to implement color dialog box. When designing our own dialog template, we must include all the items contained in the standard color dialog box. We can change the position and resize some controls, and hide the ones that do not fit our use. To use 186
Chapter 7. Common Dialog Boxes the custom dialog template, we need to set CC_ENABLETEMPLATE bit for member Flags of structure CHOOSECOLOR, and assign the instance handle of the application to member hInstance. Here the instance handle of the application can be obtained by calling function AfxGetInstanceHandle(). We also need to assign the name of the custom dialog template to member lptemplateName. Custom Dialog Template Sample 7.6\CDB demonstrates how to implement color dialog box using user-designed dialog template. It is based on sample 7.5\CDB, with two new commands Color Dialog Box | Choose Base Color and Color Dialog Box | Choose Custom Color added to the application. For command Color Dialog Box | Choose Base Color, a color dialog box that only allows the user to choose color from base colors is implemented; for command Color Dialog Box | Choose Custom Color, the user is only allowed to choose color form custom colors. The IDs of two commands are ID_COLORDIALOGBOX_CHOOSEBASECOLOR and ID_COLORDIALOGBOX_CHOOSECOSTUMCOLOR, and their WM_COMMAND message handlers are CCDBDoc::OnColordialogboxChoosebasecolor() and CCDBDoc:: OnColordialogboxChoosecostumcolor() respectively. Figure 7-6 shows the controls contained in the standard color dialog box. COLOR_BOX1 COLOR_RAINBOW COLOR_LUMSCROLL COLOR_CUSTOM1 COLOR_MIX COLOR_CURRENT COLOR_HUE COLOR_SAT COLOR_LUM COLOR_RED COLOR_GREEN COLOR_BLUE COLOR_ADD Figure 7-6. Standard controls in color dialog box The following table contains a list of ID values for these controls: ID Type of Symbol in the Sample Description Control 702 Static COLOR_LUMSCROLL Displays possible amounts of white and black in color 703 Edit COLOR_HUE Specifies the hue of the selected color 704 Edit COLOR_SAT Specifies the saturation of the selected color 705 Edit COLOR_LUM Specifies the luminosity of the selected color 706 Edit COLOR_RED Specifies the amount of red in the selected color 707 Edit COLOR_GREEN Specifies the amount of green in the selected color 708 Edit COLOR_BLUE Specifies the amount of blue in the selected color 709 Static COLOR_CURRENT Displays the selected color 710 Static COLOR_RAINBOW Displays the color matrix 712 Push button COLOR_ADD Add the selected color to custom color 719 Push button COLOR_MIX Open the color box fully 720 Static COLOR_BOX1 Displays basic colors 721 Static COLOR_CUSTOM1 Displays custom colors 1 Default push IDOK OK button button 2 Push button IDCANCEL Cancel button 1038 Push button 1038 Help button 187
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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 Using Class CMenu W
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Chapter 4. Button Chapter 4 Buttons
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Chapter 9. Font Here, member lfFace
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Chapter 9. Font } dlg.m_bBgdStyle=m
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Chapter 9. Font Function CDocument:
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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 11. Sample: Simple Paint Af
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Chapter 14. Views void CDirView::Ad
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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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