//原著:Christian Skovdal Andersen
//译者:重庆大学光电工程学院 贾旭滨(daixi1703163@163.net)
//欢迎大家批评指教,谢谢!
以下代码将演示一个150象素高的文件打开对话框,这个例子很简单,我们要做的就是让对话框更好看和有更多的用途。我们需要考虑的是怎么样用MFC来更简单的定义我们自己的对话框,这儿有许多地方是比较灵活的,所以我们可以把它搞得很好看。
如果我们想改变对话框中控件的大小或者是它的显示的样子,当然包括对话框本身,仅仅使用GetDlgItem()函数是不够的,因为控件是对话框子集中的一部分。控件的ID在头文件dlgs.h中的定义如下:
stc3,stc2 控件的标签(文件名和文件类型)
edt1,cmb1 编辑框控件和滚动条
IDOK,IDCANCEL OK和CANCEL按钮
lst1 显示文件名的窗口
当然如果你要用其它的控件的话,在头文件中还有其它的定义,以下的CMyFileDialog类是从CFileDialog中的派生出来的,这当中我还添加了一个消息句柄WM_INITDIALOG。以下是原代码:
////////////////////////////////////////////////////////////////
// This is where the real action is going on
// Remember #include <dlgs.h>
BOOL CMyFileDialog::OnInitDialog() // Override
{
// This variable should be changed acording to your wishes
// about the size of the finished dialog
const UINT iExtraSize = 150;
// Number of controls in the File Dialog
const UINT nControls = 7;
// Get a pointer to the original dialog box.
CWnd *wndDlg = GetParent();
RECT Rect;
wndDlg->GetWindowRect(&Rect);
// Change the size
wndDlg->SetWindowPos(NULL, 0, 0,
Rect.right - Rect.left,
Rect.bottom - Rect.top + iExtraSize,
SWP_NOMOVE);
// Control ID's - defined in <dlgs.h>
UINT Controls[nControls] = {stc3, stc2, // The two label controls
edt1, cmb1, // The eidt control and the drop-down box
IDOK, IDCANCEL,
lst1}; // The Explorer window
// Go through each of the controls in the dialog box, and move them to a new position
for (int i=0 ; i<nControls ; i++)
{
CWnd *wndCtrl = wndDlg->GetDlgItem(Controls[i]);
wndCtrl->GetWindowRect(&Rect);
wndDlg->ScreenToClient(&Rect); // Remember it is child controls
// Move all the controls according to the new size of the dialog.
if (Controls[i] != lst1)
wndCtrl->SetWindowPos(NULL,
Rect.left, Rect.top + iExtraSize,
0, 0, SWP_NOSIZE);
else // This is the explorer like window. It should be sized - not moved.
wndCtrl->SetWindowPos(NULL, 0, 0,
Rect.right - Rect.left,
Rect.bottom - Rect.top + iExtraSize,
SWP_NOMOVE);
}
// Remember to call the baseclass.
return CFileDialog::OnInitDialog();
}