Button positioning

This is a discussion on Button positioning within the Windows Programming forums, part of the Platform Specific Boards category; Hi! I'm trying to position my buttons on the screen based on the 1) video resolution and 2) the size ...

  1. #1
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    Button positioning

    Hi! I'm trying to position my buttons on the screen based on the 1) video resolution and 2) the size of the window (maximized, etc).

    I wanted to have four buttons on the bottom half of the screen. Two centered on the left side and two centered on the right.

    I understand how to draw the buttons with "hard coded" coordinates, but I don't even know where/how to begin to draw them any other way.

    01) How do I get the CURRENT resolution setting?
    02) How do I detect the current size of the client area?
    03) How do I cram this information into my button creation command? I assume it's a formula, but how do you calculate the position of something for a small area of the screen?

    mw
    Blucast Corporation

  2. #2
    Even death may die... Dante Shamest's Avatar
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    01) How do I get the CURRENT resolution setting?
    Code:
      int screenWidth  = GetSystemMetrics(SM_CXSCREEN) ;
      int screenHeight = GetSystemMetrics(SM_CYSCREEN) ;
    02) How do I detect the current size of the client area?
    GetClientRect

    03) How do I cram this information into my button creation command? I assume it's a formula, but how do you calculate the position of something for a small area of the screen?
    Perform the calculations, then pass the values to CreateWindow(Ex). If the size of your window changes, do the same calculations in WM_SIZE and call SetWindowPos to update the positions of your buttons.

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    Ok, I'm really starting to hate buttons now! :-)

    I created my buttons "on the fly" (ie: in my Window Procedure) and it doesn't seem to be well suited to what I want to do.

    I tried to declare the child buttons normally, but I can't seem to make it fit.

    Here's my parent window:

    Code:
    wndclass.style = CS_HREDRAW | CS_VREDRAW;
    wndclass.lpfnWndProc = WndProc;
    wndclass.cbClsExtra = 0;
    wndclass.cbWndExtra = 0;
    wndclass.hInstance = hInstance;
    wndclass.hIcon = LoadIcon (GetModuleHandle (NULL), MAKEINTRESOURCE (IDI_BOOTICON));
    wndclass.hCursor = LoadCursor (NULL, IDC_ARROW);
    wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH);
    wndclass.lpszMenuName = NULL;
    wndclass.lpszClassName = szAppName;
    Please note that I'm using WNDCLASS and *not* WNDCLASSEX.

    Here's the child button that I created on the fly:

    Code:
    mainButtons = CreateWindow
    (
    TEXT ("button"),
    TEXT ("New Game"),
    WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,
    300, 500,
    110, 30,
    hwnd,
    (HMENU) IDB_NEWGAMEBUTTON,
    GetModuleHandle (NULL),
    NULL
    );
    How do I make a button child window for the parent window?

    mw
    Blucast Corporation

  4. #4
    Even death may die... Dante Shamest's Avatar
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    How do I make a button child window for the parent window?
    I'm sorry, I don't understand. Didn't you just post the code to create the button?

  5. #5
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    Yeah, but the code to create the button was in WM_CREATE. The code to declare the parent window is in WinMain.

    Can you declare a child window in the WinMain function or do you have to put it in WM_CREATE?

    mw
    Blucast Corporation

  6. #6
    Yes, my avatar is stolen anonytmouse's Avatar
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    >> Can you declare a child window in the WinMain function <<

    Yes. So long as you've first created the parent window, of course!

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    How do I declare the button in WinMain?

    At first I simply tried to plug the information from the "CreateWindow" command in WM_CREATE for my button into a window declaration in WinMain:

    Code:
    WNDCLASS wndclass, btnclass;
    
    //parent window
    wndclass.style = CS_HREDRAW | CS_VREDRAW;
    wndclass.lpfnWndProc = WndProc;
    wndclass.cbClsExtra = 0;
    wndclass.cbWndExtra = 0;
    wndclass.hInstance = hInstance;
    wndclass.hIcon = LoadIcon (GetModuleHandle (NULL), MAKEINTRESOURCE (IDI_BOOTICON));
    wndclass.hCursor = LoadCursor (NULL, IDC_ARROW);
    wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH);
    wndclass.lpszMenuName = NULL;
    wndclass.lpszClassName = szAppName;
    
    //button window
    btnclass.style = WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON
    btnclass.lpfnWndProc = BtnProc;
    btnclass.cbClsExtra = 0;
    btnclass.cbWndExtra = 0;
    btnclass.hInstance = hInstance;
    btnclass.hIcon = LoadIcon (GetModuleHandle (NULL), MAKEINTRESOURCE (IDI_BOOTICON));
    btnclass.hCursor = LoadCursor (NULL, IDC_ARROW);
    btnclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH);
    btnclass.lpszMenuName = NULL;
    btnclass.lpszClassName = szBtnName;
    But this doesn't look right...

    mw
    Blucast Corporation

  8. #8
    C++ Enthusiast jmd15's Avatar
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    Unless I have a reason or need I just use my already registered window class for my button as well. Like this:
    Code:
    MSG msg;
    HWND hwnd,hButton;
    WNDCLASS wc;
    static TCHAR szAppName[]=TEXT("Window");
    
    wc.style=CS_HREDRAW|CS_VREDRAW;
    wc.cbWndExtra=0;
    wc.cbClsExtra=0;
    wc.hInstance=hInstance;
    wc.lpfnWndProc=WndProc;
    wc.hbrBackground=(HBRUSH)(COLOR_WINDOW);
    wc.hIcon=LoadIcon(NULL,IDI_APPLICATION);
    wc.hCursor=LoadCursor(NULL,IDC_ARROW);
    wc.lpszMenuName=NULL;
    wc.lpszClassName=szAppName;
    
    if(!RegisterClass(&wc))
    {
    MessageBox(NULL,"Error registering WNDCLASS!","ERROR",MB_ICONERROR);
    return 0;
    }
    
    hwnd=CreateWindow(szAppName,szAppName,WS_POPUPWINDOW|WS_CAPTION|WS_MINIMIZEBOX,350,150,300,210,NULL,NULL,hInstance,NULL);
    hButton=CreateWindow(TEXT("BUTTON"),TEXT("Button"),WS_CHILD|WS_VISIBLE,130,50,100,23,hwnd,NULL,hInstance,NULL);
    I took this code from a calculator I made a while back(I made a few changes though), so that's why it's a popup window and positioned the way it is.
    Last edited by jmd15; 10-09-2005 at 09:11 PM.
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  9. #9
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    Oh wow! That was SO EASY! Thanks!

    So all I had to do was move the "Create Window" command to my WinMain area.

    How do I tell what code I can put in the WinMain function and what I must put in the window procedure? I thought WinMain was where you declared the initial window, but then you had to put everything that deals with the window in the windows procedure...

    For instance:

    I tried to put my CreateWindow (for my button) in WM_PAINT. I figured that since I'm using GetClientRect there already I may as well do my buttons too. You can probably imagine what happened...

    mw
    Last edited by Lionmane; 10-09-2005 at 11:41 PM.
    Blucast Corporation

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    Ok, this is what I've got so far on positioning my buttons. I have 4 buttons that are each 30 pixels high and 110 pixels wide.

    I want to position them on the bottom half of the screen, centered vertically and horizontally:

    Code:
    GetClientRect (hwnd, &rect);
    
    top_left_button_x = (rect.right - (2 * btnWidth)) / 3;
    top_right_button_x = rect.right - ((rect.right - (2 * btnWidth)) / 3) - btnWidth;
    Right now I'm only trying to center them horizontally.

    Both buttons are positioned too far to the left.

    It's supposed to display something like:

    (spaces) button (spaces) button (spaces)

    mw
    Last edited by Lionmane; 10-10-2005 at 01:01 AM.
    Blucast Corporation

  11. #11
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    Ok, I'm thinking that GetClientRect is broken just like LoadBitmap. I'm fairly certain my calculations are correct, but my buttons are still off-centered to the left.

    Is my client area affected by my stretching a bitmap over it?

    mw
    Blucast Corporation

  12. #12
    Even death may die... Dante Shamest's Avatar
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    GetClientRect works just fine. I use it all the time. Stretching a bitmap over a client area should not affect it's size at all.

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    Ok, I figured out what's going on with centering my buttons. For some reason my client area doesn't extend to the edge of the window.

    My RECT.right value is 762. To find out where on the screen that is located, I subtracted the width of my button from that (110) and drew my button from that starting point.

    The button was drawn about three quarters of the way across the window.

    What can cause this?

    mw
    Blucast Corporation

  14. #14
    Even death may die... Dante Shamest's Avatar
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    You're drawing the button inside the window right? When you create a button with CreateWindow, you're using client coordinates of the main window. So don't you just need to know how big your window's client area is? Why do you need to care how big the screen is?

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    Oops!

    Please substitute the words "client area" for every use of "screen" that I made in the previous post.

    My parent window is maximized, and I'm attempting to print my buttons ONLY on my window's client area.

    When I attempt to draw my button on the right edge of the client area, it draws the button three quarters of the way across instead of at the edge of the window.

    mw
    Last edited by Lionmane; 10-10-2005 at 06:26 PM.
    Blucast Corporation

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