关于修改wxGenericDirCtrl使用Windows原生目录控件的技术咨询

Hey there! Let's break down your questions one by one to help you contribute that native Windows directory control support to wxGenericDirCtrl.

On Windows, the native directory tree (like in File Explorer) is built using the Win32 TreeView control integrated with the Windows Shell API. You don't need heavy frameworks here—just pure Win32 and Shell functions.

The core steps are:

• Use CreateWindowEx to instantiate a WC_TREEVIEW window class with appropriate styles (like TVS_HASLINES, TVS_LINESATROOT, TVS_HASBUTTONS to match Explorer's look).
• Integrate it with the Windows Shell namespace using functions like SHGetDesktopFolder, IShellFolder::ParseDisplayName, and SHGetFileInfo to fetch icons, display names, and directory structures.
• Handle TreeView notifications (like TVN_ITEMEXPANDING) to dynamically load subdirectories when the user expands a node, instead of preloading everything.

Nope—you don't need MFC, .NET, or any extra frameworks. wxWidgets itself is built on top of native platform APIs, so sticking to pure Win32 and Shell API aligns perfectly with its design philosophy. Adding MFC would introduce unnecessary dependencies, and .NET is managed code which doesn't fit with wxWidgets' native C++ approach.

Here are some targeted keywords to dig up more details:

• Win32 TreeView Control Shell Integration
• SHGetFileInfo TreeView Node Population
• Windows Shell Namespace TreeView Implementation
• wxWidgets Native Control Subclassing
• wxGenericDirCtrl Win32 Port Example
• TVN_ITEMEXPANDING Shell Directory Enumeration

Below is a simplified snippet showing how to create a basic Shell-integrated TreeView (you'd wrap this in a wxWidgets control subclass):

// Create the TreeView window
HWND hTreeCtrl = CreateWindowEx(
    0,
    WC_TREEVIEW,
    L"",
    WS_CHILD | WS_VISIBLE | TVS_HASLINES | TVS_LINESATROOT | TVS_HASBUTTONS,
    0, 0, 300, 400,
    hParentWnd, // Replace with your wxWidgets window's HWND
    (HMENU)IDC_SHELL_TREE,
    GetModuleHandle(NULL),
    NULL
);

// Add the desktop as the root node
LPITEMIDLIST pidlDesktop;
SHGetDesktopFolder()->ParseDisplayName(NULL, NULL, L"", NULL, &pidlDesktop, NULL);

SHFILEINFO sfi = {0};
SHGetFileInfo(
    (LPCTSTR)pidlDesktop,
    0,
    &sfi,
    sizeof(SHFILEINFO),
    SHGFI_PIDL | SHGFI_DISPLAYNAME | SHGFI_ICON | SHGFI_SMALLICON
);

TVINSERTSTRUCT tvInsert = {0};
tvInsert.hParent = TVI_ROOT;
tvInsert.hInsertAfter = TVI_LAST;
tvInsert.item.mask = TVIF_TEXT | TVIF_IMAGE | TVIF_SELECTEDIMAGE | TVIF_PARAM;
tvInsert.item.pszText = sfi.szDisplayName;
tvInsert.item.iImage = sfi.iIcon;
tvInsert.item.iSelectedImage = sfi.iIcon;
tvInsert.item.lParam = (LPARAM)pidlDesktop; // Store PIDL for later use

HTREEITEM hRoot = TreeView_InsertItem(hTreeCtrl, &tvInsert);

For the wxWidgets integration part, look at how existing native controls (like wxTreeCtrl on Windows) are implemented in the wxWidgets codebase—they subclass wxWindow and wrap the Win32 control, handling message forwarding and wxWidgets-style event mapping. You'd want to follow that pattern to replace the generic dir control's implementation on Windows.

内容的提问来源于stack exchange，提问作者Rocketmagnet