EnumChildWindows 中的 MoveWindow 对对话框内列表视图的影响：为什么 ListView Header 没有正确滚动
Effect of MoveWindow in EnumChildWindows over listview inside the Dialog Box: Why ListView Header is not correctly scrolling
我有一个 listview 控件 (lvc)，它位于 DialogBox(dbx) 中，而且 dbx 也有一个垂直滚动条。
每当滚动条滚动时调用EnumChildWindows来枚举dbx的所有childwindow。回调函数包含一个 MoveWindow 函数，可以移动该 lvc。 lvc 滚动正常，但它的列 headers 滚动不正常，它们不随列表视图移动。
如果我在回调函数中注释掉 MoveWindow 函数，则不会发生任何变化。 （ Off-course lvc 不会移动！）这意味着 EnumChildWindow 没有问题，但是 MoveWindow 在回调函数中引起了问题，我确信这是因为调用 MoveWindow 回调函数外部的函数可以正常工作（因为在这个例子中只有一个控件，即 lvc，所以我不需要枚举所有 child window ）。
这是代码：
main.cpp
#if defined(UNICODE) && !defined(_UNICODE)
#define _UNICODE
#elif defined(_UNICODE) && !defined(UNICODE)
#define UNICODE
#endif
#include <tchar.h>
#define _WIN32_IE 0x0700
#include <windows.h>
#include <windowsx.h>
#include <commctrl.h>
#include <vector>
#include "res.h"
#define btn 0
#include <iostream>
/* Declare Windows procedure */
LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);
BOOL CALLBACK diaproc(HWND hwmd, UINT msg, WPARAM wp, LPARAM lp);
BOOL CALLBACK edc(HWND hwmd,LPARAM lp);
HINSTANCE gi;
int iPrevVscroll=0;
/* Make the class name into a global variable */
TCHAR szClassName[ ] = _T("CodeBlocksWindowsApp");
int WINAPI WinMain (HINSTANCE hThisInstance,
HINSTANCE hPrevInstance,
LPSTR lpszArgument,
int nCmdShow)
{
HWND hwnd; /* This is the handle for our window */
MSG messages; /* Here messages to the application are saved */
WNDCLASSEX wincl; /* Data structure for the windowclass */
/* The Window structure */
gi = wincl.hInstance = hThisInstance;
wincl.lpszClassName = szClassName;
wincl.lpfnWndProc = WindowProcedure; /* This function is called by windows */
wincl.style = CS_DBLCLKS ; /* Catch double-clicks */
wincl.cbSize = sizeof (WNDCLASSEX);
/* Use default icon and mouse-pointer */
wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);
wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
wincl.lpszMenuName = NULL; /* No menu */
wincl.cbClsExtra = 0; /* No extra bytes after the window class */
wincl.cbWndExtra = 0; /* structure or the window instance */
/* Use Windows's default colour as the background of the window */
wincl.hbrBackground = (HBRUSH) COLOR_BACKGROUND;
/* Register the window class, and if it fails quit the program */
if (!RegisterClassEx (&wincl))
return 0;
/* The class is registered, let's create the program*/
hwnd = CreateWindowEx (
0, /* Extended possibilites for variation */
szClassName, /* Classname */
_T("Code::Blocks Template Windows App"), /* Title Text */
WS_OVERLAPPEDWINDOW, /* default window */
CW_USEDEFAULT, /* Windows decides the position */
CW_USEDEFAULT, /* where the window ends up on the screen */
544, /* The programs width */
375, /* and height in pixels */
HWND_DESKTOP, /* The window is a child-window to desktop */
NULL, /* No menu */
hThisInstance, /* Program Instance handler */
NULL /* No Window Creation data */
);
/* Make the window visible on the screen */
ShowWindow (hwnd, nCmdShow);
/* Run the message loop. It will run until GetMessage() returns 0 */
while (GetMessage (&messages, NULL, 0, 0))
{
/* Translate virtual-key messages into character messages */
TranslateMessage(&messages);
/* Send message to WindowProcedure */
DispatchMessage(&messages);
}
/* The program return-value is 0 - The value that PostQuitMessage() gave */
return messages.wParam;
}
/* This function is called by the Windows function DispatchMessage() */
LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message) /* handle the messages */
{
case WM_CREATE:
CreateWindow(WC_BUTTON, "CLICK", WS_CHILD | BS_DEFPUSHBUTTON | WS_VISIBLE, 10, 10, 80, 30, hwnd, (HMENU)btn, gi, NULL );
break;
case WM_COMMAND:{
if( LOWORD(wParam) == btn && HIWORD(wParam) == BN_CLICKED ) DialogBox(gi, MAKEINTRESOURCE(dia), hwnd,(DLGPROC)diaproc);
DWORD err = GetLastError();
std::cout<<err<<std::endl<<dia;
}
break;
case WM_DESTROY:
PostQuitMessage (0); /* send a WM_QUIT to the message queue */
break;
default: /* for messages that we don't deal with */
return DefWindowProc (hwnd, message, wParam, lParam);
}
return 0;
}
BOOL CALLBACK diaproc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lp)
{
static HWND lv_hwnd;
static int sci;
switch(msg)
{
case WM_INITDIALOG:
{
INITCOMMONCONTROLSEX is;
is.dwSize = sizeof(INITCOMMONCONTROLSEX);
is.dwICC = ICC_LISTVIEW_CLASSES;
InitCommonControlsEx(&is);
int col_fmt[5] = { LVCFMT_CENTER, LVCFMT_LEFT, LVCFMT_CENTER, LVCFMT_CENTER, LVCFMT_CENTER };
int col_wid[5] = { 30, 90, 50, 30, 70 };
std::vector<TCHAR*> col_nam(5);
col_nam[0] = _T("S.No"); col_nam[1] = _T("Description"); col_nam[2] = _T("HSN"); col_nam[3] = _T("QTY"); col_nam[4] = _T("Rate");
lv_hwnd = CreateWindow(
WC_LISTVIEW,
_T(""),
WS_CHILD | LVS_REPORT | LVS_EDITLABELS | WS_VISIBLE,
10, 0, 300, 200,
hwnd,
NULL,
(HINSTANCE)GetWindowLong(hwnd, GWL_HINSTANCE),
NULL
);
ListView_SetExtendedListViewStyle(lv_hwnd, LVS_EX_FLATSB | LVS_EX_FULLROWSELECT | LVS_EX_GRIDLINES | LVS_EX_LABELTIP );
LVCOLUMN lvc;
lvc.mask = LVCF_FMT | LVCF_SUBITEM | LVCF_WIDTH | LVCF_TEXT;
for(int i =0; i < 5; i++)
{
lvc.fmt = col_fmt[i];
lvc.cx = col_wid[i];
lvc.pszText = col_nam[i];
lvc.iSubItem = i;
ListView_InsertColumn(lv_hwnd, i, &lvc);
}
SetScrollRange(hwnd, SB_VERT, 0, 225, TRUE);
SetScrollPos(hwnd, SB_VERT, 0, TRUE);
} return FALSE;
case WM_VSCROLL:
{
RECT rc; GetWindowRect(lv_hwnd, &rc);
POINT pt1 = {rc.left, rc.top}; ScreenToClient(hwnd, &pt1);
POINT pt2 = {rc.right, rc.bottom}; ScreenToClient(hwnd, &pt2);
std::cout<<"rc.top : "<< rc.top<<"\nrc.bottom: "<< rc.bottom <<"\nrc.right : "<<rc.right<<"\nrc.left : "<<rc.left<<"\n\n";
std::cout<<"pt1.y : "<< pt1.y<<"\npt2.y: "<< pt2.y<<"\npt2.x : "<<pt2.x<<"\npt1.x : "<<pt1.x<<"\n\n\n";
switch(LOWORD(wParam))
{
case SB_PAGEDOWN:
case SB_LINEDOWN:
sci += 10; break;
case SB_PAGEUP:
case SB_LINEUP:
sci -= 10; break;
case SB_THUMBTRACK:
sci = HIWORD(wParam); break;
};
sci = sci < 0 ? 0 : sci > 225 ? 225 : sci;
SetScrollPos(hwnd, SB_VERT, sci, FALSE);
//MoveWindow(lv_hwnd, pt1.x, pt1.y - sci + iPrevVscroll, pt2.x - pt1.x, pt2.y - pt1.y, TRUE);
EnumChildWindows(hwnd, edc, (LPARAM)sci);
}; return TRUE;
case WM_COMMAND:
if(LOWORD(wParam) == IDCANCEL) EndDialog(hwnd, wParam); return TRUE;
default: return FALSE;
}
}
BOOL CALLBACK edc(HWND hwnd, LPARAM lp)
{
long s = (long) lp;
RECT rc; GetWindowRect(hwnd, &rc);
POINT pt1 = {rc.left, rc.top}; ScreenToClient(hwnd, &pt1);
POINT pt2 = {rc.right, rc.bottom}; ScreenToClient(hwnd, &pt2);
MoveWindow(hwnd, pt1.x, pt1.y + s - iPrevVscroll, pt2.x - pt1.x, pt2.y - pt1.y, TRUE);
}
res.h
#define lv 1
#define dia 2
res.rc
#include <windows.h>
#include <commctrl.h>
#include <richedit.h>
#include "res.h"
dia DIALOGEX 0,0,500,300
CAPTION "New Invoice"
STYLE DS_3DLOOK | DS_CENTER | DS_MODALFRAME | DS_SHELLFONT | WS_CAPTION | WS_VISIBLE | WS_POPUP | WS_SYSMENU | WS_THICKFRAME | WS_VSCROLL
FONT 8, "Ms Shell Dlg"
{
}
在 main.cpp 中，您会在底部找到 MoveWindow 和其他相关函数。
以下图片很有用。
同样，出于说明的目的，MoveWindow 中的滚动逻辑也不同。
当我遇到这个问题时，最初我正在做一个有很多控件的项目。我单独分析了这个，发现我上面写的是什么。虽然我通过采用不同的方法向下滚动所有控件（不包括从 EnumChildWindows 内部调用 MoveWindow 的方法）绕过了这个问题，但我很想知道原因和解决方案这个问题。
感谢您抽出宝贵的时间参与post。任何建议或改进也将是惊人的！
来自EnumChildWindows() reference的备注部分：
If a child window has created child windows of its own,
EnumChildWindows enumerates those windows as well.
所以您在这里所做的是滚动 listview 控件，然后还分别滚动 header 控件。结果是 header 控件相对于列表视图控件移动，如第二张屏幕截图所示。
相反，您应该只移动对话框的直接 children，因为 grand children 会随着它们的 parents.
自动移动
可能的解决方案：
- 检查
EnumChildWindows() 回调中的 parent/child 关系（例如，通过在 child 上调用 GetParent() 并将其与您的对话框句柄进行比较）。
- 不调用
EnumChildWindows() 和 MoveWindow()，而是调用 ScrollWindowEx() 和 SW_SCROLLCHILDREN。这是实现滚动的最简单方法，所以我更喜欢这个解决方案。
我有一个 listview 控件 (lvc)，它位于 DialogBox(dbx) 中，而且 dbx 也有一个垂直滚动条。
每当滚动条滚动时调用EnumChildWindows来枚举dbx的所有childwindow。回调函数包含一个 MoveWindow 函数，可以移动该 lvc。 lvc 滚动正常，但它的列 headers 滚动不正常，它们不随列表视图移动。
如果我在回调函数中注释掉 MoveWindow 函数，则不会发生任何变化。 （ Off-course lvc 不会移动！）这意味着 EnumChildWindow 没有问题，但是 MoveWindow 在回调函数中引起了问题，我确信这是因为调用 MoveWindow 回调函数外部的函数可以正常工作（因为在这个例子中只有一个控件，即 lvc，所以我不需要枚举所有 child window ）。
这是代码：
main.cpp
#if defined(UNICODE) && !defined(_UNICODE)
#define _UNICODE
#elif defined(_UNICODE) && !defined(UNICODE)
#define UNICODE
#endif
#include <tchar.h>
#define _WIN32_IE 0x0700
#include <windows.h>
#include <windowsx.h>
#include <commctrl.h>
#include <vector>
#include "res.h"
#define btn 0
#include <iostream>
/* Declare Windows procedure */
LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);
BOOL CALLBACK diaproc(HWND hwmd, UINT msg, WPARAM wp, LPARAM lp);
BOOL CALLBACK edc(HWND hwmd,LPARAM lp);
HINSTANCE gi;
int iPrevVscroll=0;
/* Make the class name into a global variable */
TCHAR szClassName[ ] = _T("CodeBlocksWindowsApp");
int WINAPI WinMain (HINSTANCE hThisInstance,
HINSTANCE hPrevInstance,
LPSTR lpszArgument,
int nCmdShow)
{
HWND hwnd; /* This is the handle for our window */
MSG messages; /* Here messages to the application are saved */
WNDCLASSEX wincl; /* Data structure for the windowclass */
/* The Window structure */
gi = wincl.hInstance = hThisInstance;
wincl.lpszClassName = szClassName;
wincl.lpfnWndProc = WindowProcedure; /* This function is called by windows */
wincl.style = CS_DBLCLKS ; /* Catch double-clicks */
wincl.cbSize = sizeof (WNDCLASSEX);
/* Use default icon and mouse-pointer */
wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);
wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
wincl.lpszMenuName = NULL; /* No menu */
wincl.cbClsExtra = 0; /* No extra bytes after the window class */
wincl.cbWndExtra = 0; /* structure or the window instance */
/* Use Windows's default colour as the background of the window */
wincl.hbrBackground = (HBRUSH) COLOR_BACKGROUND;
/* Register the window class, and if it fails quit the program */
if (!RegisterClassEx (&wincl))
return 0;
/* The class is registered, let's create the program*/
hwnd = CreateWindowEx (
0, /* Extended possibilites for variation */
szClassName, /* Classname */
_T("Code::Blocks Template Windows App"), /* Title Text */
WS_OVERLAPPEDWINDOW, /* default window */
CW_USEDEFAULT, /* Windows decides the position */
CW_USEDEFAULT, /* where the window ends up on the screen */
544, /* The programs width */
375, /* and height in pixels */
HWND_DESKTOP, /* The window is a child-window to desktop */
NULL, /* No menu */
hThisInstance, /* Program Instance handler */
NULL /* No Window Creation data */
);
/* Make the window visible on the screen */
ShowWindow (hwnd, nCmdShow);
/* Run the message loop. It will run until GetMessage() returns 0 */
while (GetMessage (&messages, NULL, 0, 0))
{
/* Translate virtual-key messages into character messages */
TranslateMessage(&messages);
/* Send message to WindowProcedure */
DispatchMessage(&messages);
}
/* The program return-value is 0 - The value that PostQuitMessage() gave */
return messages.wParam;
}
/* This function is called by the Windows function DispatchMessage() */
LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message) /* handle the messages */
{
case WM_CREATE:
CreateWindow(WC_BUTTON, "CLICK", WS_CHILD | BS_DEFPUSHBUTTON | WS_VISIBLE, 10, 10, 80, 30, hwnd, (HMENU)btn, gi, NULL );
break;
case WM_COMMAND:{
if( LOWORD(wParam) == btn && HIWORD(wParam) == BN_CLICKED ) DialogBox(gi, MAKEINTRESOURCE(dia), hwnd,(DLGPROC)diaproc);
DWORD err = GetLastError();
std::cout<<err<<std::endl<<dia;
}
break;
case WM_DESTROY:
PostQuitMessage (0); /* send a WM_QUIT to the message queue */
break;
default: /* for messages that we don't deal with */
return DefWindowProc (hwnd, message, wParam, lParam);
}
return 0;
}
BOOL CALLBACK diaproc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lp)
{
static HWND lv_hwnd;
static int sci;
switch(msg)
{
case WM_INITDIALOG:
{
INITCOMMONCONTROLSEX is;
is.dwSize = sizeof(INITCOMMONCONTROLSEX);
is.dwICC = ICC_LISTVIEW_CLASSES;
InitCommonControlsEx(&is);
int col_fmt[5] = { LVCFMT_CENTER, LVCFMT_LEFT, LVCFMT_CENTER, LVCFMT_CENTER, LVCFMT_CENTER };
int col_wid[5] = { 30, 90, 50, 30, 70 };
std::vector<TCHAR*> col_nam(5);
col_nam[0] = _T("S.No"); col_nam[1] = _T("Description"); col_nam[2] = _T("HSN"); col_nam[3] = _T("QTY"); col_nam[4] = _T("Rate");
lv_hwnd = CreateWindow(
WC_LISTVIEW,
_T(""),
WS_CHILD | LVS_REPORT | LVS_EDITLABELS | WS_VISIBLE,
10, 0, 300, 200,
hwnd,
NULL,
(HINSTANCE)GetWindowLong(hwnd, GWL_HINSTANCE),
NULL
);
ListView_SetExtendedListViewStyle(lv_hwnd, LVS_EX_FLATSB | LVS_EX_FULLROWSELECT | LVS_EX_GRIDLINES | LVS_EX_LABELTIP );
LVCOLUMN lvc;
lvc.mask = LVCF_FMT | LVCF_SUBITEM | LVCF_WIDTH | LVCF_TEXT;
for(int i =0; i < 5; i++)
{
lvc.fmt = col_fmt[i];
lvc.cx = col_wid[i];
lvc.pszText = col_nam[i];
lvc.iSubItem = i;
ListView_InsertColumn(lv_hwnd, i, &lvc);
}
SetScrollRange(hwnd, SB_VERT, 0, 225, TRUE);
SetScrollPos(hwnd, SB_VERT, 0, TRUE);
} return FALSE;
case WM_VSCROLL:
{
RECT rc; GetWindowRect(lv_hwnd, &rc);
POINT pt1 = {rc.left, rc.top}; ScreenToClient(hwnd, &pt1);
POINT pt2 = {rc.right, rc.bottom}; ScreenToClient(hwnd, &pt2);
std::cout<<"rc.top : "<< rc.top<<"\nrc.bottom: "<< rc.bottom <<"\nrc.right : "<<rc.right<<"\nrc.left : "<<rc.left<<"\n\n";
std::cout<<"pt1.y : "<< pt1.y<<"\npt2.y: "<< pt2.y<<"\npt2.x : "<<pt2.x<<"\npt1.x : "<<pt1.x<<"\n\n\n";
switch(LOWORD(wParam))
{
case SB_PAGEDOWN:
case SB_LINEDOWN:
sci += 10; break;
case SB_PAGEUP:
case SB_LINEUP:
sci -= 10; break;
case SB_THUMBTRACK:
sci = HIWORD(wParam); break;
};
sci = sci < 0 ? 0 : sci > 225 ? 225 : sci;
SetScrollPos(hwnd, SB_VERT, sci, FALSE);
//MoveWindow(lv_hwnd, pt1.x, pt1.y - sci + iPrevVscroll, pt2.x - pt1.x, pt2.y - pt1.y, TRUE);
EnumChildWindows(hwnd, edc, (LPARAM)sci);
}; return TRUE;
case WM_COMMAND:
if(LOWORD(wParam) == IDCANCEL) EndDialog(hwnd, wParam); return TRUE;
default: return FALSE;
}
}
BOOL CALLBACK edc(HWND hwnd, LPARAM lp)
{
long s = (long) lp;
RECT rc; GetWindowRect(hwnd, &rc);
POINT pt1 = {rc.left, rc.top}; ScreenToClient(hwnd, &pt1);
POINT pt2 = {rc.right, rc.bottom}; ScreenToClient(hwnd, &pt2);
MoveWindow(hwnd, pt1.x, pt1.y + s - iPrevVscroll, pt2.x - pt1.x, pt2.y - pt1.y, TRUE);
}
res.h
#define lv 1
#define dia 2
res.rc
#include <windows.h>
#include <commctrl.h>
#include <richedit.h>
#include "res.h"
dia DIALOGEX 0,0,500,300
CAPTION "New Invoice"
STYLE DS_3DLOOK | DS_CENTER | DS_MODALFRAME | DS_SHELLFONT | WS_CAPTION | WS_VISIBLE | WS_POPUP | WS_SYSMENU | WS_THICKFRAME | WS_VSCROLL
FONT 8, "Ms Shell Dlg"
{
}
在 main.cpp 中，您会在底部找到 MoveWindow 和其他相关函数。
以下图片很有用。
同样，出于说明的目的，MoveWindow 中的滚动逻辑也不同。
当我遇到这个问题时，最初我正在做一个有很多控件的项目。我单独分析了这个，发现我上面写的是什么。虽然我通过采用不同的方法向下滚动所有控件（不包括从 EnumChildWindows 内部调用 MoveWindow 的方法）绕过了这个问题，但我很想知道原因和解决方案这个问题。
感谢您抽出宝贵的时间参与post。任何建议或改进也将是惊人的！
来自EnumChildWindows() reference的备注部分：
If a child window has created child windows of its own, EnumChildWindows enumerates those windows as well.
所以您在这里所做的是滚动 listview 控件，然后还分别滚动 header 控件。结果是 header 控件相对于列表视图控件移动，如第二张屏幕截图所示。
相反，您应该只移动对话框的直接 children，因为 grand children 会随着它们的 parents.
自动移动可能的解决方案：
- 检查
EnumChildWindows()回调中的 parent/child 关系（例如，通过在 child 上调用GetParent()并将其与您的对话框句柄进行比较）。 - 不调用
EnumChildWindows()和MoveWindow()，而是调用ScrollWindowEx()和SW_SCROLLCHILDREN。这是实现滚动的最简单方法，所以我更喜欢这个解决方案。