Win32_滚动条
一 滚动条
1 滚动条样式
1.1 水平滚动条 SBS_HORZ
1.2 垂直滚动条 SBS_VERT
2 滚动条的使用
2.1 滚动条的创建
窗口类名称 SCROLLBAR
2.2 消息处理
1) 水平滚动条 WM_HSCROLL
LOWORD(wParam) - 滚动的标示
HIWORD(wParam) - 当前滑块的位置
lParam - 窗口的句柄
2）垂直滚动条 WM_VSCROLL
LOWORD(wParam) - 滚动的标示
HIWORD(wParam) - 当前滑块的位置
lParam - 窗口的句柄
3）HIWORD(wParam)只在 SB_THUMBPOSITION/SB_THUMBTRACK时有效
2.3 滚动条的滚动范围
SBM_SETRANGE 设置滚动条的滚动范围
wParam - 最小值，起始值
lParam - 最大值，终止值
SBM_GETRANGE 获取滚动条的滚动范围
wParam - 最小值存放的INT的地址
lParam - 最大值存放的INT的地址
2.4 滑块位置的设置和获取
SBM_SETPOS 设置滑块位置
wParam - 新的滑块位置
lParam - 重新绘制窗口
SBM_GETPOS 获取返回当前位置
View Code
1 // WinScrollBar.cpp : Defines the entry point for the application. 2 // 3 4 #include "stdafx.h" 5 6 HINSTANCE g_hInst = NULL; 7 HWND g_hHorz = NULL; 8 HWND g_hVert = NULL; 9 void OnCreate( HWND hWnd, WPARAM wParam, 10 LPARAM lParam ) 11 { //创建滚动条 12 g_hHorz = CreateWindow( "SCROLLBAR", "HORZ", 13 WS_CHILD|WS_VISIBLE|SBS_HORZ, 14 , 300, 300, 30, hWnd, 15 (HMENU)1001, g_hInst, NULL ); 16 g_hVert = CreateWindow( "SCROLLBAR", "VERT", 17 WS_CHILD|WS_VISIBLE|SBS_VERT, 18 , 0, 30, 300, hWnd, 19 (HMENU)1002, g_hInst, NULL ); 20 //设置滚动范围 21 SendMessage( g_hHorz, SBM_SETRANGE, 0, 300 ); 22 SendMessage( g_hVert, SBM_SETRANGE, 0, 300 ); 23 24 } 25 void OnHScroll( HWND hWnd, WPARAM wParam, 26 LPARAM lParam ) 27 { 28 int nScrollCode = LOWORD( wParam ); 29 int nPos = HIWORD( wParam ); 30 switch( nScrollCode ) 31 { 32 case SB_LINELEFT: //左边箭头 33 nPos = SendMessage( g_hHorz, SBM_GETPOS, 34 , 0 ); 35 nPos--; 36 SendMessage( g_hHorz, SBM_SETPOS, 37 nPos, TRUE ); 38 break; 39 case SB_LINERIGHT: //右边箭头 40 nPos = SendMessage( g_hHorz, SBM_GETPOS, 41 , 0 ); 42 nPos++; 43 SendMessage( g_hHorz, SBM_SETPOS, 44 nPos, TRUE ); 45 break; 46 case SB_PAGELEFT: //滑块左边的空白区域 47 nPos = SendMessage( g_hHorz, SBM_GETPOS, 48 , 0 ); 49 nPos -= 10; 50 SendMessage( g_hHorz, SBM_SETPOS, 51 nPos, TRUE ); 52 break; 53 case SB_PAGERIGHT://滑块右边的空白区域 54 nPos = SendMessage( g_hHorz, SBM_GETPOS, 55 , 0 ); 56 nPos += 10; 57 SendMessage( g_hHorz, SBM_SETPOS, 58 nPos, TRUE ); 59 break; 60 case SB_THUMBPOSITION://拖拽滑块后 61 SendMessage( g_hHorz, SBM_SETPOS, 62 nPos, TRUE ); 63 break; 64 } 65 66 InvalidateRect( hWnd, NULL, TRUE ); 67 } 68 69 void OnVScroll( HWND hWnd, WPARAM wParam, 70 LPARAM lParam ) 71 { 72 int nScrollCode = LOWORD( wParam ); 73 int nPos = HIWORD( wParam ); 74 switch( nScrollCode ) 75 { 76 case SB_LINEUP: //上边箭头 77 nPos = SendMessage( g_hVert, SBM_GETPOS, 78 , 0 ); 79 nPos--; 80 SendMessage( g_hVert, SBM_SETPOS, 81 nPos, TRUE ); 82 break; 83 case SB_LINEDOWN://下边箭头 84 nPos = SendMessage( g_hVert, SBM_GETPOS, 85 , 0 ); 86 nPos++; 87 SendMessage( g_hVert, SBM_SETPOS, 88 nPos, TRUE ); 89 break; 90 case SB_PAGEUP://滑块上边的空白区域 91 nPos = SendMessage( g_hVert, SBM_GETPOS, 92 , 0 ); 93 nPos -= 10; 94 SendMessage( g_hVert, SBM_SETPOS, 95 nPos, TRUE ); 96 break; 97 case SB_PAGEDOWN://滑块下边的空白区域 98 nPos = SendMessage( g_hVert, SBM_GETPOS, 99 , 0 ); 100 nPos += 10; 101 SendMessage( g_hVert, SBM_SETPOS, 102 nPos, TRUE ); 103 break; 104 case SB_THUMBPOSITION://拖拽滑块后 105 SendMessage( g_hVert, SBM_SETPOS, 106 nPos, TRUE ); 107 break; 108 } 109 110 InvalidateRect( hWnd, NULL, TRUE ); 111 } 112 113 void OnPaint( HWND hWnd, WPARAM wParam, 114 LPARAM lParam ) 115 { 116 PAINTSTRUCT ps = { 0 }; 117 HDC hDC = BeginPaint( hWnd, &ps ); 118 119 int nVert = SendMessage( g_hVert, 120 SBM_GETPOS, 0, 0 ); 121 int nHorz = SendMessage( g_hHorz, 122 SBM_GETPOS, 0, 0 ); 123 124 CHAR szText[] = "Hello ScroolBar"; 125 TextOut( hDC, 150 - nHorz, 150 - nVert, 126 szText, strlen(szText) ); 127 128 EndPaint( hWnd, &ps ); 129 } 130 131 LRESULT CALLBACK WndProc( HWND hWnd, 132 UINT nMsg, 133 WPARAM wParam, 134 LPARAM lParam ) 135 { 136 switch( nMsg ) 137 { 138 case WM_PAINT: 139 OnPaint( hWnd, wParam, lParam ); 140 break; 141 case WM_CREATE: 142 OnCreate( hWnd, wParam, lParam ); 143 break; 144 case WM_HSCROLL: 145 OnHScroll( hWnd, wParam, lParam ); 146 break; 147 case WM_VSCROLL: 148 OnVScroll( hWnd, wParam, lParam ); 149 break; 150 case WM_DESTROY: 151 PostQuitMessage( 0 ); 152 return 0; 153 } 154 return DefWindowProc( hWnd, nMsg, 155 wParam, lParam ); 156 } 157 158 BOOL RegisterWnd( LPSTR pszClassName ) 159 { 160 WNDCLASSEX wce = { 0 }; 161 wce.cbSize = sizeof( wce ); 162 wce.cbClsExtra = 0; 163 wce.cbWndExtra = 0; 164 wce.hbrBackground = HBRUSH(COLOR_WINDOW); 165 wce.hCursor = NULL; 166 wce.hIcon = NULL; 167 wce.hIconSm = NULL; 168 wce.hInstance = g_hInst; 169 wce.lpfnWndProc = WndProc; 170 wce.lpszClassName = pszClassName; 171 wce.lpszMenuName = NULL; 172 wce.style = CS_HREDRAW|CS_VREDRAW; 173 174 ATOM nAtom = RegisterClassEx( &wce ); 175 if( 0 == nAtom ) 176 { 177 return FALSE; 178 } 179 180 return TRUE; 181 } 182 183 HWND CreateWnd( LPSTR pszClassName ) 184 { 185 HWND hWnd = CreateWindowEx( 0, 186 pszClassName, "MyWnd", 187 WS_OVERLAPPEDWINDOW|WS_HSCROLL|WS_VSCROLL, 188 CW_USEDEFAULT, 189 CW_USEDEFAULT, CW_USEDEFAULT, 190 CW_USEDEFAULT, NULL, NULL, g_hInst, 191 NULL ); 192 return hWnd; 193 } 194 195 void DisplayWnd( HWND hWnd ) 196 { 197 ShowWindow( hWnd, SW_SHOW ); 198 UpdateWindow( hWnd ); 199 } 200 201 void Message( ) 202 { 203 MSG msg = { 0 }; 204 while( GetMessage( &msg, NULL, 0, 0 ) ) 205 { 206 TranslateMessage( &msg ); 207 DispatchMessage( &msg ); 208 } 209 } 210 211 int APIENTRY WinMain(HINSTANCE hInstance, 212 HINSTANCE hPrevInstance, 213 LPSTR lpCmdLine, 214 int nCmdShow) 215 { 216 g_hInst = hInstance; 217 RegisterWnd( "MYWND" ); 218 HWND hWnd = CreateWnd( "MYWND" ); 219 DisplayWnd( hWnd ); 220 Message( ); 221 return 0; 222 }
