滚动条未完全显示
当listview项超过listview高度时，我想使用win32 api出现垂直滚动条。
hwndList1 = CreateWindow(WC_LISTVIEW , L"" , WS_VISIBLE | WS_CHILD | LVS_REPORT | WS_BORDER | WS_VSCROLL | LVS_OWNERDRAWFIXED, 10 , 10 , width , height, hwnd, NULL, GetModuleHandle(NULL), 0);
// list procedure
LRESULT CALLBACK ListProc( HWND hwnd, UINT msg, WPARAM wp, LPARAM lp, UINT_PTR, DWORD_PTR ){
switch(msg)
{
case WM_DRAWITEM:
break;
case WM_NOTIFY :
if (((LPNMHDR) lp)->code == NM_CUSTOMDRAW)
{
LPNMCUSTOMDRAW lpcd = (LPNMCUSTOMDRAW)lp;
switch(lpcd->dwDrawStage)
{
case CDDS_PREPAINT :
return CDRF_NOTIFYITEMDRAW;
case CDDS_ITEMPREPAINT:
{
SetBkColor(lpcd->hdc, RGB(255, 132, 72));
SetTextColor(lpcd->hdc, RGB(255, 255, 245));
return CDRF_NEWFONT;
}
}
}
break;
case WM_NCPAINT:
{
RECT rc;
GetWindowRect(hwnd, &rc);
OffsetRect(&rc, -rc.left, -rc.top);
auto hdc = GetWindowDC(hwnd);
auto hpen = CreatePen(PS_SOLID, 1, RGB(201, 201, 201));
auto oldpen = SelectObject(hdc, hpen);
SelectObject(hdc, GetStockObject(NULL_BRUSH));
Rectangle(hdc, rc.left, rc.top, rc.right, rc.bottom);
SelectObject(hdc, oldpen);
DeleteObject(oldpen);
ReleaseDC(hwnd, hdc);
return 0;
}
case WM_NCDESTROY:
RemoveWindowSubclass(hwnd, ListProc, 0);
break;
}
return DefSubclassProc(hwnd, msg, wp, lp);
}
// window procedure
LRESULT CALLBACK WndProc( HWND hwnd , UINT msg , WPARAM wParam , LPARAM lParam)
{
switch(msg){
case WM_DRAWITEM:
{
LPDRAWITEMSTRUCT pDIS=(LPDRAWITEMSTRUCT)lParam;
HDC hDC=pDIS -> hDC;
RECT rc = pDIS -> rcItem;
HFONT hF;
HBRUSH bg = (HBRUSH) (::GetStockObject(DC_BRUSH));
HPEN pn=(HPEN)(::GetStockObject(NULL_PEN));
::SelectObject( hDC , bg );
::SelectObject( hDC , pn );
::SetTextColor( hDC , RGB(0,0,0));
int points=0;
if( resX <= 800 ){
hF=CreateFont(17, 0, 0, 0, FW_NORMAL, FALSE, FALSE, FALSE, ANSI_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS, DEFAULT_QUALITY, DEFAULT_PITCH | FF_SWISS, L"Tahoma");
}
else{
points=10;
int fontheight= -MulDiv(points, GetDeviceCaps(hDC , LOGPIXELSY ) , 72 );
hF=CreateFont(fontheight, 0, 0, 0, FW_NORMAL, FALSE, FALSE, FALSE, ANSI_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS, DEFAULT_QUALITY, DEFAULT_PITCH | FF_SWISS, L"Tahoma");
}
HFONT hOldFont = (HFONT) SelectObject(hDC, hF);
if( (pDIS->itemID % 2) != 0 )
::SetDCBrushColor(hDC, RGB(255,255,255));
else{
::SetDCBrushColor(hDC, RGB(223, 241, 255));
}
::Rectangle( hDC , rc.left , rc.top , rc.right , rc.bottom );
wchar_t buffer[1000] = {0};
ListView_GetItemText(pDIS -> hwndItem, pDIS -> itemID, 0, (LPWSTR)buffer, 1000);
rc.left=12;
::DrawText(hDC, (LPWSTR)buffer, -1, &rc, DT_SINGLELINE | DT_VCENTER);
SelectObject(hDC, hOldFont);
DeleteObject(hF);
}
break;
case WM_MEASUREITEM:{
MEASUREITEMSTRUCT * m= (MEASUREITEMSTRUCT*) lParam;
m->itemHeight=28;
}
break;
case WM_NOTIFY:
if(((LPNMHDR)lParam)->code == NM_CUSTOMDRAW) {
LPNMLVCUSTOMDRAW lplvcd = (LPNMLVCUSTOMDRAW)lParam;
switch(lplvcd->nmcd.dwDrawStage) {
case CDDS_PREPAINT:
return CDRF_NOTIFYITEMDRAW;
case CDDS_ITEMPREPAINT:
if (((int)lplvcd->nmcd.dwItemSpec%2)==0) {
lplvcd->clrText = RGB(0,0,0);
lplvcd->clrTextBk = RGB(255, 255, 255);
} else {
lplvcd->clrText = RGB(0,0,0);
lplvcd->clrTextBk = RGB(202, 233, 255);
}
return CDRF_NEWFONT;
break;
}
}
return TRUE;
case WM_COMMAND:
switch(LOWORD(wParam)){
case ID_FILE_EXIT:
PostMessage(hwnd, WM_CLOSE , 0 , 0);
break;
case ID_ABOUT:
{
int ret=DialogBox( GetModuleHandle(NULL) , MAKEINTRESOURCE(ID_ABOUT) , hwnd , AboutDlgProc );
}
break;
}
break;
case WM_CLOSE:
DestroyWindow( hwnd );
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc( hwnd , msg , wParam , lParam );
}
return 0;
}
但是我有两个问题：
1-当我打开程序时，显示滚动条和拇指，但不显示上下箭头，当我单击滚动条时，将显示箭头。
2-当我在列表视图的父窗口中还原并再次最大化时，我看到滚动条的位置为空，并在单击后显示。
为什么滚动条不能完全显示，我该如何解决？
谢谢！
1 个答案:
答案 0 :(得分：1)
如果只想重绘边框颜色，则可以先删除ListView的边框，然后在主窗口的回调函数中处理WM_PAINT消息。
//Move Border
hwndList1 = CreateWindow(WC_LISTVIEW, L"", WS_VISIBLE | WS_CHILD | LVS_REPORT | WS_BORDER | WS_VSCROLL | LVS_OWNERDRAWFIXED , 500, 200, width, height, hWnd, NULL, GetModuleHandle(NULL), 0);
DWORD Style = GetWindowLong(hwndList1, GWL_STYLE);
SetWindowLong(hwndList1, GWL_STYLE, Style &~WS_BORDER);
重新处理主窗口的重绘事件：
case WM_PAINT:
{
PAINTSTRUCT ps;
HDC hdc = BeginPaint(hWnd, &ps);
RECT rc,clrc;
GetWindowRect(hwndList1, &rc);
ScreenToClient(hWnd, (LPPOINT)&rc.left);
ScreenToClient(hWnd, (LPPOINT)&rc.right);
auto hpen = CreatePen(PS_SOLID, 1, RGB(255, 0, 0));
auto oldpen = SelectObject(hdc, hpen);
SelectObject(hdc, GetStockObject(NULL_BRUSH));
if (S_1) //S_1 = FALSE
{
Rectangle(hdc, rc.left - 1, rc.top - 1, rc.right + 1, rc.bottom + 1);
}
else
{
Rectangle(hdc, 29, 39, 231, 161); //The first time need to force a redrawing of a particular location
}
SelectObject(hdc, oldpen);
DeleteObject(oldpen);
ReleaseDC(hwndList1, hdc);
// TODO: Add any drawing code that uses hdc here...
EndPaint(hWnd, &ps);
}
调试：
完整代码（仅作参考修改）：
#include "stdafx.h"
#include "Test_listview_1.h"
#include <commctrl.h>
#include <uxtheme.h>
#pragma comment (lib,"Comctl32.lib")
#pragma comment (lib,"UxTheme.lib")
#define MAX_LOADSTRING 100
// Global Variables:
HINSTANCE hInst; // current instance
WCHAR szTitle[MAX_LOADSTRING]; // The title bar text
WCHAR szWindowClass[MAX_LOADSTRING]; // the main window class name
HWND hwndList1;
int middle = 600, middleH = 400, width = 400, height = 200;
BOOL S_1 = FALSE;
// Forward declarations of functions included in this code module:
ATOM MyRegisterClass(HINSTANCE hInstance);
BOOL InitInstance(HINSTANCE, int);
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
LRESULT CALLBACK ListProc(HWND hwnd, UINT msg, WPARAM wp, LPARAM lp, UINT_PTR, DWORD_PTR);
INT_PTR CALLBACK About(HWND, UINT, WPARAM, LPARAM);
int APIENTRY wWinMain(_In_ HINSTANCE hInstance,
_In_opt_ HINSTANCE hPrevInstance,
_In_ LPWSTR lpCmdLine,
_In_ int nCmdShow)
{
UNREFERENCED_PARAMETER(hPrevInstance);
UNREFERENCED_PARAMETER(lpCmdLine);
// TODO: Place code here.
// Initialize global strings
LoadStringW(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
LoadStringW(hInstance, IDC_TESTLISTVIEW1, szWindowClass, MAX_LOADSTRING);
MyRegisterClass(hInstance);
// Perform application initialization:
if (!InitInstance (hInstance, nCmdShow))
{
return FALSE;
}
HACCEL hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_TESTLISTVIEW1));
MSG msg;
// Main message loop:
while (GetMessage(&msg, nullptr, 0, 0))
{
if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
return (int) msg.wParam;
}
ATOM MyRegisterClass(HINSTANCE hInstance)
{
WNDCLASSEXW wcex;
wcex.cbSize = sizeof(WNDCLASSEX);
wcex.style = CS_HREDRAW | CS_VREDRAW;
wcex.lpfnWndProc = WndProc;
wcex.cbClsExtra = 0;
wcex.cbWndExtra = 0;
wcex.hInstance = hInstance;
wcex.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_TESTLISTVIEW1));
wcex.hCursor = LoadCursor(nullptr, IDC_ARROW);
wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wcex.lpszMenuName = MAKEINTRESOURCEW(IDC_TESTLISTVIEW1);
wcex.lpszClassName = szWindowClass;
wcex.hIconSm = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));
return RegisterClassExW(&wcex);
}
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
hInst = hInstance; // Store instance handle in our global variable
HWND hWnd = CreateWindowW(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, nullptr, nullptr, hInstance, nullptr);
if (!hWnd)
{
return FALSE;
}
ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);
return TRUE;
}
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
case WM_CREATE:
{
INITCOMMONCONTROLSEX icex; // Structure for control initialization.
icex.dwICC = ICC_LISTVIEW_CLASSES;
InitCommonControlsEx(&icex);
hwndList1 = CreateWindow(WC_LISTVIEW, L"", WS_VISIBLE | WS_CHILD | LVS_REPORT | WS_BORDER | WS_VSCROLL | LVS_OWNERDRAWFIXED , 500, 200, width, height, hWnd, NULL, GetModuleHandle(NULL), 0);
DWORD Style = GetWindowLong(hwndList1, GWL_STYLE);
SetWindowLong(hwndList1, GWL_STYLE, Style &~WS_BORDER);
SetWindowSubclass(hwndList1, &ListProc, 0, NULL);
LVCOLUMN column;
column.mask = LVCF_WIDTH | LVCF_TEXT;
column.cx = 200;
column.pszText = (LPWSTR)L"MASTER";
ListView_InsertColumn(hwndList1, 0, &column); //column for sub item 0
LVITEM lvi = {};
lvi.iItem = ListView_GetItemCount(hwndList1);
lvi.mask = LVIF_TEXT | LVIF_STATE;
lvi.pszText = (LPWSTR)L"MASTER1";
lvi.iSubItem = 0;
ListView_InsertItem(hwndList1, &lvi);
lvi.pszText = (LPWSTR)L"MASTER2";
ListView_InsertItem(hwndList1, &lvi);
lvi.pszText = (LPWSTR)L"MASTER3";
ListView_InsertItem(hwndList1, &lvi);
lvi.pszText = (LPWSTR)L"MASTER4";
ListView_InsertItem(hwndList1, &lvi);
lvi.pszText = (LPWSTR)L"MASTER5";
ListView_InsertItem(hwndList1, &lvi);
lvi.pszText = (LPWSTR)L"MASTER6";
ListView_InsertItem(hwndList1, &lvi);
lvi.pszText = (LPWSTR)L"MASTER7";
ListView_InsertItem(hwndList1, &lvi);
}
break;
case WM_COMMAND:
{
int wmId = LOWORD(wParam);
// Parse the menu selections:
switch (wmId)
{
case IDM_ABOUT:
DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);
break;
case IDM_EXIT:
DestroyWindow(hWnd);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
}
break;
case WM_SIZE:
if (wParam == SIZE_RESTORED) {
SetWindowPos(hwndList1, 0, 30, 40, 200, 120, 0);
}
else if (wParam == SIZE_MAXIMIZED) {
SetWindowPos(hwndList1, 0, middle - (18 + width), middleH - (18 + height), width, height, 0);
RECT rc;
GetClientRect(hwndList1, &rc);
ListView_SetColumnWidth(hwndList1, 0, rc.right - rc.left);//rc.left is zero
}
break;
case WM_DRAWITEM:
{
LPDRAWITEMSTRUCT pDIS = (LPDRAWITEMSTRUCT)lParam;
HDC hDC = pDIS->hDC;
RECT rc = pDIS->rcItem;
HFONT hF;
HBRUSH bg = (HBRUSH)(::GetStockObject(DC_BRUSH));
HPEN pn = (HPEN)(::GetStockObject(NULL_PEN));
::SelectObject(hDC, bg);
::SelectObject(hDC, pn);
::SetTextColor(hDC, RGB(0, 0, 0));
int points = 0;
// if (resX <= 800)
// {
hF = CreateFont(17, 0, 0, 0, FW_NORMAL, FALSE, FALSE, FALSE, ANSI_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS, DEFAULT_QUALITY, DEFAULT_PITCH | FF_SWISS, L"Tahoma");
// }
// else
// {
// points = 10;
// int fontheight = -MulDiv(points, GetDeviceCaps(hDC, LOGPIXELSY), 72);
// hF = CreateFont(fontheight, 0, 0, 0, FW_NORMAL, FALSE, FALSE, FALSE, ANSI_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS, DEFAULT_QUALITY, DEFAULT_PITCH | FF_SWISS, L"Tahoma");
// }
HFONT hOldFont = (HFONT)SelectObject(hDC, hF);
if ((pDIS->itemID % 2) != 0)
::SetDCBrushColor(hDC, RGB(255, 255, 255));
else {
::SetDCBrushColor(hDC, RGB(223, 241, 255));
}
::Rectangle(hDC, rc.left, rc.top, rc.right, rc.bottom);
wchar_t buffer[1000] = { 0 };
ListView_GetItemText(pDIS->hwndItem, pDIS->itemID, 0, (LPWSTR)buffer, 1000);
rc.left = 12;
::DrawText(hDC, (LPWSTR)buffer, -1, &rc, DT_SINGLELINE | DT_VCENTER);
SelectObject(hDC, hOldFont);
DeleteObject(hF);
}
break;
case WM_MEASUREITEM:
{
MEASUREITEMSTRUCT * m = (MEASUREITEMSTRUCT*)lParam;
m->itemHeight = 28;
}
break;
case WM_PAINT:
{
PAINTSTRUCT ps;
HDC hdc = BeginPaint(hWnd, &ps);
RECT rc,clrc;
GetWindowRect(hwndList1, &rc);
ScreenToClient(hWnd, (LPPOINT)&rc.left);
ScreenToClient(hWnd, (LPPOINT)&rc.right);
auto hpen = CreatePen(PS_SOLID, 1, RGB(255, 0, 0));
auto oldpen = SelectObject(hdc, hpen);
SelectObject(hdc, GetStockObject(NULL_BRUSH));
if (S_1)
{
Rectangle(hdc, rc.left - 1, rc.top - 1, rc.right + 1, rc.bottom + 1);
}
else
{
Rectangle(hdc, 29, 39, 231, 161);
}
SelectObject(hdc, oldpen);
DeleteObject(oldpen);
ReleaseDC(hwndList1, hdc);
// TODO: Add any drawing code that uses hdc here...
EndPaint(hWnd, &ps);
}
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}
// Message handler for about box.
INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
UNREFERENCED_PARAMETER(lParam);
switch (message)
{
case WM_INITDIALOG:
return (INT_PTR)TRUE;
case WM_COMMAND:
if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
{
EndDialog(hDlg, LOWORD(wParam));
return (INT_PTR)TRUE;
}
break;
}
return (INT_PTR)FALSE;
}
LRESULT CALLBACK ListProc(HWND hwnd, UINT msg, WPARAM wp, LPARAM lp, UINT_PTR, DWORD_PTR) {
switch (msg)
{
case WM_NOTIFY:
if (((LPNMHDR)lp)->code == NM_CUSTOMDRAW)
{
LPNMCUSTOMDRAW lpcd = (LPNMCUSTOMDRAW)lp;
switch (lpcd->dwDrawStage)
{
case CDDS_PREPAINT:
return CDRF_NOTIFYITEMDRAW;
case CDDS_ITEMPREPAINT:
{
SetBkColor(lpcd->hdc, RGB(255, 132, 72));
SetTextColor(lpcd->hdc, RGB(255, 255, 0));
return CDRF_NEWFONT;
}
}
}
break;
case WM_NCPAINT:
{
RECT rc;
GetWindowRect(hwnd, &rc);
OffsetRect(&rc, -rc.left, -rc.top);
auto hdc = GetWindowDC(hwnd);
auto hpen = CreatePen(PS_SOLID, 1, RGB(255, 0, 0));
auto oldpen = SelectObject(hdc, hpen);
SelectObject(hdc, GetStockObject(NULL_BRUSH));
// Rectangle(hdc, rc.left, rc.top, rc.right, rc.bottom);
SelectObject(hdc, oldpen);
DeleteObject(oldpen);
ReleaseDC(hwnd, hdc);
S_1 = TRUE;
break;
}
case WM_NCDESTROY:
RemoveWindowSubclass(hwnd, ListProc, 0);
break;
}
return DefSubclassProc(hwnd, msg, wp, lp);
}
编辑：
在处理WM_NCPAINT事件时，我使用break确保可以成功重绘滚动条，然后稍后处理控件边框。
在主窗口的回调函数中，WM_PAINT有两次Rectangle次。因为在测试期间，我发现当我第一次重画边框时，边框的位置与实际ListView绘图的位置不同。除了第一次，背面都一样，所以我分别处理了第一个边框图。
第一个边框的位置基于
case WM_SIZE:
if (wParam == SIZE_RESTORED) {
SetWindowPos(hwndList1, 0, 30, 40, 200, 120, 0);
Rectangle(hdc, 29, 39, 231, 161);//30-1,40-1, 200+30+1, 120+40+1,
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