Resizing the Windows

When I finished creating the windows, I had to find an easy way to resize the application's main window. In the C version, I used the handy DeferWindowPos function to resize all the windows at the same time. For those who are new to Win32, DeferWindowPos updates a structure that contains multiple window positions. You use this function as you would use the window enumeration functions—that is, you begin, defer, and end. This code illustrates how I resized all the windows:

BOOL ResizeWindows (HWND hwnd)

{

RECT rcl;

HDWP hdwp;



// Get the client area of the parent window.

GetClientRect (hwnd, &rcl);



// You will defer all the application's windows.

hdwp = BeginDeferWindowPos (NUM_WINDOWS);



// First, reset the size of the status bar.

DeferWindowPos (hdwp, g_Listing.hWndStatus, NULL, 0, 0,

rcl.right - rcl.left, 20, SWP_NOZORDER | SWP_NOMOVE);



// Next, reset the size of the toolbar.

DeferWindowPos (hdwp, g_Listing.hWndToolbar, NULL, 0, 0,

rcl.right - rcl.left, 20, SWP_NOZORDER | SWP_NOMOVE);



// Next, reset the size of the tree view control.

DeferWindowPos (hdwp, g_Listing.hWndTreeView, NULL, 0, 0,

(rcl.right - rcl.left ) / 4, rcl.bottom - rcl.top - 46,

SWP_NOZORDER | SWP_NOMOVE);



// Last, reset the size of the list view control.

DeferWindowPos (hdwp, g_Listing.hWndListView, NULL,

(rcl.right - rcl.left ) / 4, 27,

(rcl.right - rcl.left) - ((rcl.right - rcl.left) / 4),

rcl.bottom - rcl.top - 46,

SWP_NOZORDER);



return EndDeferWindowPos (hdwp);

}

In MFCEXP, I added a handler for the WM_SIZE message, OnSize, to set the window positions for all the windows. The CToolBarCtrl class includes AutoSize, a special member function that resizes the toolbar to fit within the parent window.

void CMfcexpView::OnSize (UINT nType, int cx, int cy)

{

CView::OnSize (nType, cx, cy);



// Resize the toolbar.

m_Toolbar.AutoSize ();



// Resize the status bar.

// Make it fit along the bottom of the client area.

m_StatusBar.MoveWindow (0, cx - 10, cy, cy - 10);



// Set the rectangle for each part of the status bar.

// Make each 1/2 the width of the client area.

int aWidths [2];



aWidths [0] = cx / 2;

aWidths [1] = -1;

m_StatusBar.SetParts (2, aWidths);



m_TreeCtl.MoveWindow (0, 25, cx / 4, cy - 45);



m_ListCtl.MoveWindow (cx / 4, 25, cx, cy - 45);

}