?? dlgfaq.html
字號:
<HTML><LINK HREF="style.css" REL="STYLESHEET" TYPE="text/css"><HEAD><TITLE>Tutorial: Dialog FAQ</TITLE></HEAD><BODY><FONT SIZE="-1">[ <A HREF="./index.html">contents</A>| <A HREF="http://www.winprog.org/">#winprog</A>]</FONT><HR><H1>Dialog FAQ</H1><P>Example: dlg_three</P><IMG SRC="images/dlg_three.gif" ALT="[images/dlg_three.gif]" ALIGN="right"><P>Now don't get me wrong, this is a <I>Tutorial</I>, not a <I>Reference</I>, but some questions peopleask SO often that I figured I might as well include them here.<H2>Changing Colours</H2>In general, the only reason you'd want to do this is to simulate an link on a dialog boxor some similar task, because otherwise you're probably just making your program ugly andhard on the eyes if you go adding a bunch of colors to the dialogs, but that doesn't stop people from doing it, and there are actually a few valid reasons, so here you go :)<P>Windows sends a variety of messages related to colours to your dialog procedure, and by handling these messages you can change what colour certain things are displayed in. Forexample, to change the color of the dialog box itself, you can handle <CODE>WM_CTLCOLORDLG</CODE>, to change the colors for a static control you handle <CODE>WM_CTLCOLORSTATIC</CODE> and so on.<P>First you can create a brush to use to paint the background and store it for later.the <CODE>WM_CTLCOLORDLG</CODE> and related messages will get called often during thecourse of your program, and if you created a new brush every time, eventually you would useup a great deal of RAM with dead brushes. This way we have more control, and we can deleteit when the dialog is destroyed and we know we won't need it any more.<PRE CLASS="SNIP"> HBRUSH g_hbrBackground = CreateSolidBrush(RGB(0, 0, 0));</PRE><PRE CLASS="SNIP"> case WM_CTLCOLORDLG: return (LONG)g_hbrBackground; case WM_CTLCOLORSTATIC: { HDC hdcStatic = (HDC)wParam; SetTextColor(hdcStatic, RGB(255, 255, 255)); SetBkMode(hdcStatic, TRANSPARENT); return (LONG)g_hbrBackground; } break;</PRE><P>Notice the line that sets the background mode to transparent... if you leave this line offthe background will be filled in with the brush you specify, but when the control draws thetext it will get written over with the default background color! Setting the text drawingmode to transparent fixes this problem. The other option would be to <CODE>SetBkColor()</CODE>to the same color as our background brush, but I like this solution better.<P>Changing the colors on pretty much any other standard control works the same way, just lookup the <CODE>WM_CTLCOLOR*</CODE> messages in your Win32 reference. Note that an edit controlwill send a <CODE>WM_CTLCOLORSTATIC</CODE> if it is read only, and <CODE>WM_CTLCOLOREDIT</CODE> if it isn't.<P>If you have more than one static (or other) control that you want to be different colours, thenyou'll need to check the ID of the control you are getting the message from and change your coloursbased on that. You are passed the <CODE>HWND</CODE> of the control in <CODE>lParam</CODE>, and you canget the ID of the control from this using <CODE>GetDlgCtlrID()</CODE>. Note that static controlsare all given a default ID of <CODE>IDC_STATIC</CODE> (-1) by the resource editor, so if you want to be able to tell them apart you'll need to assign them new IDs.<H2>Giving the Dialog an Icon</H2>A fairly simple task, you just need to send <CODE>WM_SETICON</CODE> to your dialog. Since windows usestwo icons however, you need to call it twice, once for the small icon displayed in the cornerof the window, and once for the large one displayed when you hit Alt-Tab. You can just sendthe same handle both times unless you have multi-sized icons.<P>To just set the default application icon, you can use the following code:<PRE CLASS="SNIP"> SendMessage(hwnd, WM_SETICON, ICON_SMALL, (LPARAM)LoadIcon(NULL, MAKEINTRESOURCE(IDI_APPLICATION))); SendMessage(hwnd, WM_SETICON, ICON_BIG, (LPARAM)LoadIcon(NULL, MAKEINTRESOURCE(IDI_APPLICATION)));</PRE>When you substitute your own icon resource for the default, remember to change the<CODE>HINSTANCE</CODE> parameter of <CODE>LoadIcon()</CODE> to your applications instance (you can get it by calling<CODE>GetModuleHandle(NULL)</CODE> if you don't have it stored from <CODE>WinMain()</CODE>).<H2>Why Doesn't my Combo Box Work?</H2>An all-too-common problem is people adding a combo box to their dialog and they can't figureout why the list doesn't show up when they run their program and click the little arrow. This is understandable, since the solution is not very intuitive. <P>When you create a combo box and specify it's height, you are actually specifying the entireheight, drop-down list included, NOT the height of the control when it is collapsed whichis determined by the system based on the size of the font used. <P>For example, givingthe control a height of 100 pixels, the system sizes the control itself to the default(lets say 30 in this case), and when you click on the arrow, the drop down list would be70 pixels high, for a total of 100 pixels.<P>If you use the VC++ resource editor to place the combo on your dialog, you will notice youcan't size it vertically. Unless you click on the arrow in the editor, and it will then change the focus rectangle to indicate you are sizing the dropdown list, and you can set theheight to whatever you want.<H2>What about all the other controls!</H2>Well I could give examples of all of the other controls, but that's what MSDN and Petzold are for :) If you can't figure out how to use them, you probably need to re-read some partsof this tutorial, or get a book which will explain things more thouroughly.<P>I'd like to give you a link to a useful page on MSDN, but Microsoft seems to be determined to preventme from doing so as links to individual MSDN pages either change rapidly or don't work period. Thereforyou'll probably have to figure out how to get around yourself, look around for sections like <I>User Interface Services</I>, and <I>Windows Controls</I>, sometimes under a <I>Platform SDK</I> section.<P><A HREF="http://msdn.microsoft.com/library/?url=/library/en-us/shellcc/platform/commctls/indivcontrol.asp">MSDN - Windows Controls</A><HR><FONT SIZE="-1">Copyright © 1998-2003, Brook Miles (<A HREF="mailto:forger(nospam)winprog.org">theForger</A>). All rights reserved.</FONT><SCRIPT language="JavaScript"><!-- var re = /\(nospam\)/ig; var str; for(i = 0;i < document.links.length;i++) { str = "" + document.links(i).href; if(str.search(re) != -1) document.links(i).href = str.replace(re, "@"); str = "" + document.links(i).innerHTML; if(str.search(re) != -1) document.links(i).innerHTML = str.replace(re, "@"); }--></SCRIPT></BODY></HTML>?? 快捷鍵說明
復制代碼
Ctrl + C
搜索代碼
Ctrl + F
全屏模式
F11
切換主題
Ctrl + Shift + D
顯示快捷鍵
?
增大字號
Ctrl + =
減小字號
Ctrl + -