标签:win32gui c scroll winapi movewindow
我有一个listview控件(lvc),它在DialogBox(dbx)内,并且dbx也具有垂直滚动条.
每当滚动条滚动时,都会调用EnumChildWindows来枚举dbx的所有子窗口.回调函数包含一个将移动该lvc的MoveWindow函数. lvc可以很好地滚动,但不能滚动其列标题,它们不随列表视图一起移动.
如果我在回调函数中注释掉MoveWindow函数,则没有任何变化. (偏离路线的lvc不会移动!)这意味着EnumChildWindow没问题,但是回调函数内部的MoveWindow引起了问题,我对此很确定,因为从回调函数外部调用MoveWindow函数可以正常工作(因为在此示例中只有一个控件,即lvc,所以我不需要枚举所有子窗口).
这是代码:
main.cpp中
#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,您可以在底部找到MoveWindow和其他相关功能.
以下图像很有用.
同样,出于说明的目的,两个MoveWindow中的滚动逻辑也不同.
最初,当我遇到此问题时,我正在一个具有许多控件的项目上工作.我分别对此进行了分析,并发现了我上面写的内容.尽管我通过采用不同的方法来向下滚动所有控件(不包括从EnumChildWindows内部调用MoveWindow的控件)来绕过此问题,但是我很好奇知道此问题的原因和解决方案.
感谢您在此篇长文章上的宝贵时间.任何建议或改进也将是惊人的!
解决方法:
从EnumChildWindows()
reference的备注部分:
If a child window has created child windows of its own,
EnumChildWindows enumerates those windows as well.
因此,您在这里要做的是滚动listview控件,然后分别滚动标题控件.结果是标题控件相对于listview控件移动,如第二个屏幕截图所示.
相反,您应该只移动对话框的直接子级,因为大子级将自动与其父级一起移动.
可能的解决方案:
>在EnumChildWindows()回调中检查父/子关系(例如,通过在子对象上调用GetParent()并将其与对话框句柄进行比较).
>而不是调用EnumChildWindows()和MoveWindow(),而是使用SW_SCROLLCHILDREN调用ScrollWindowEx().这是实现滚动的最简单方法,所以我更喜欢这种解决方案.
标签:win32gui,c,scroll,winapi,movewindow 来源: https://codeday.me/bug/20191009/1879097.html
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