组合框子类化列表框

Question

我想为一些定制原因子类化组合框的列表框和编辑控件。以下是代码工作。编辑控件的子类化工作正常，但Listbox没有获取MouseDown的消息。

void Subclass(HWND hComboBox) 
{ 
    HWND hEdit=FindWindowEx(hComboBox, NULL, WC_EDIT, NULL); 
    HWND hCombo=FindWindowEx(hComboBox, NULL, WC_LISTBOX, NULL); 
    SetProp(hEdit, TEXT("Wprc"), (HANDLE)GetWindowLongPtr(hEdit, GWL_WNDPROC)); 
    SubclassWindow(hEdit, ComboBox_Proc); 
    SetProp(hCombo, TEXT("Wprc1"), (HANDLE)GetWindowLongPtr(hCombo, GWL_WNDPROC)); 
    SubclassWindow(hCombo, ComboBox_Proc1); 
} 


static LRESULT CALLBACK ComboBox_Proc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam) 
{ 

    switch(msg) 
    { 
     case WM_CHAR: 
      break; 
     case WM_KEYDOWN: 
      break; 
     case WM_DESTROY: 
      SetWindowLongPtr(hwnd, GWLP_WNDPROC, (DWORD)GetProp(hwnd, TEXT("Wprc"))); 
      RemoveProp(hwnd, TEXT("Wprc")); 
      break; 
     default: 
      return CallWindowProc((WNDPROC)GetProp(hwnd, TEXT("Wprc")), hwnd, msg, wParam, lParam); 
    } 
    return FALSE; 
} 

static LRESULT CALLBACK ComboBox_Proc1(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam) 
{ 
    switch(msg) 
    { 
     case WM_LBUTTONDOWN: 
      //PROBLEM IS HERE 
      break; 
     case WM_DESTROY: 
      SetWindowLongPtr(hwnd, GWLP_WNDPROC, (DWORD)GetProp(hwnd, TEXT("Wprc1"))); 
      RemoveProp(hwnd, TEXT("Wprc1")); 
      break; 
     default: 
      return CallWindowProc((WNDPROC)GetProp(hwnd, TEXT("Wprc1")), hwnd, msg, wParam, lParam); 
    } 
    return FALSE; 
} 

Answer 1

ComboBox的列表框部分是类型COMBOLBOX（与L-）的。

ComboLBox窗口不是ComboBox窗口的子项。 我发现子类COMBOLBOX控件的唯一方法如下。

在绘制列表框之前，Windows将WM_CTLCOLORLISTBOX消息发送到COMBOBOX（no L）。该消息的lParam包含列表框的句柄。

case WM_CTLCOLORLISTBOX: 
{  
    if (!hSubclassedListBox) 
    { 
     hSubclassedListBox = (HWND)lParam; 
     SubclassWindow(hSubclassedListBox , MyLBProc); 
    } 
} 

Alsoo看到这个link以获取更多信息