垂直滚动条测试

// ScrollBarTest.cpp : 定义应用程序的入口点。
//

#include "stdafx.h"
#include "ScrollBarTest.h"

#define MAX_LOADSTRING 100

// 全局变量:
HINSTANCE hInst;                                // 当前实例
TCHAR szTitle[MAX_LOADSTRING];                  // 标题栏文本
TCHAR szWindowClass[MAX_LOADSTRING];            // 主窗口类名

// 此代码模块中包含的函数的前向声明:
ATOM                MyRegisterClass(HINSTANCE hInstance);
BOOL                InitInstance(HINSTANCE, int);
LRESULT CALLBACK    WndProc(HWND, UINT, WPARAM, LPARAM);
INT_PTR CALLBACK    About(HWND, UINT, WPARAM, LPARAM);

int totalHeight = 0;
int ScrollPos = 0;

int APIENTRY _tWinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPTSTR    lpCmdLine,
int       nCmdShow)
{
UNREFERENCED_PARAMETER(hPrevInstance);
UNREFERENCED_PARAMETER(lpCmdLine);

// TODO: 在此放置代码。
MSG msg;
HACCEL hAccelTable;

// 初始化全局字符串
LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
LoadString(hInstance, IDC_SCROLLBARTEST, szWindowClass, MAX_LOADSTRING);
MyRegisterClass(hInstance);

// 执行应用程序初始化:
if (!InitInstance (hInstance, nCmdShow))
{
return FALSE;
}

hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_SCROLLBARTEST));

// 主消息循环:
while (GetMessage(&msg, NULL, 0, 0))
{
if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}

return (int) msg.wParam;
}

//
//  函数: MyRegisterClass()
//
//  目的: 注册窗口类。
//
//  注释:
//
//    仅当希望
//    此代码与添加到 Windows 95 中的“RegisterClassEx”
//    函数之前的 Win32 系统兼容时，才需要此函数及其用法。调用此函数十分重要，
//    这样应用程序就可以获得关联的
//    “格式正确的”小图标。
//
ATOM MyRegisterClass(HINSTANCE hInstance)
{
WNDCLASSEX 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_SCROLLBARTEST));
wcex.hCursor        = LoadCursor(NULL, IDC_ARROW);
wcex.hbrBackground  = (HBRUSH)(COLOR_WINDOW+1);
wcex.lpszMenuName   = MAKEINTRESOURCE(IDC_SCROLLBARTEST);
wcex.lpszClassName  = szWindowClass;
wcex.hIconSm        = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));

return RegisterClassEx(&wcex);
}

//
//   函数: InitInstance(HINSTANCE, int)
//
//   目的: 保存实例句柄并创建主窗口
//
//   注释:
//
//        在此函数中，我们在全局变量中保存实例句柄并
//        创建和显示主程序窗口。
//
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
HWND hWnd;

hInst = hInstance; // 将实例句柄存储在全局变量中

hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW | WS_VSCROLL,
CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);

if (!hWnd)
{
return FALSE;
}

ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);

int y = 0;
WCHAR buf[200] = {0};
for (int i = 0; i < 10; i++)
{
memset(buf,0,sizeof(WCHAR) * 200);
wsprintf(buf,L"第%d个按钮",i);

CreateWindow(L"button", buf, WS_CHILD | WS_VISIBLE,
0, y, 100, 50, hWnd, NULL, hInstance, NULL);

totalHeight = y + 50;
y += 100;

}
SCROLLINFO si = {sizeof(SCROLLINFO),
SIF_PAGE|SIF_POS|SIF_RANGE|SIF_TRACKPOS|SIF_PAGE, 0, 0, 0, 0,
0};
GetScrollInfo (hWnd, SB_VERT, &si);
si.fMask = SIF_PAGE;
si.nPage = 50;
SetScrollInfo (hWnd, SB_VERT, &si, TRUE);
return TRUE;
}
void setPos(HWND hWnd,int Pos)
{

SCROLLINFO si = {sizeof(SCROLLINFO),
SIF_PAGE|SIF_POS|SIF_RANGE|SIF_TRACKPOS, 0, 0, 0, 0,
0};
GetScrollInfo (hWnd, SB_VERT, &si);

int lastPos = si.nPos;
int maxPos = 0;
if (si.nPage == 0)
maxPos = si.nMax;
else
maxPos = si.nMax - si.nPage + 1;

if (Pos < si.nMin)
Pos = si.nMin;
if (Pos > maxPos)
Pos = maxPos;
si.fMask = SIF_POS;
si.nPos = Pos;
SetScrollInfo (hWnd, SB_VERT, &si, TRUE);

if (Pos != lastPos)
{
double n = double(Pos) / (double)maxPos;
RECT rc;
GetClientRect(hWnd,&rc);
int height = rc.bottom - rc.top;
int tmpPos = (height - totalHeight) * n;
int pos  = tmpPos - ScrollPos;
ScrollPos = tmpPos;
ScrollWindow(hWnd,0, pos , NULL ,NULL);
}
}

LRESULT CALLBACK HandleMouseWheel(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
SCROLLINFO si = {sizeof(SCROLLINFO),
SIF_PAGE|SIF_POS|SIF_RANGE|SIF_TRACKPOS, 0, 0, 0, 0,
0};
GetScrollInfo (hWnd, SB_VERT, &si);

int lastPos = si.nPos;
int maxPos = 0;
if (si.nPage == 0)
maxPos = si.nMax;
else
maxPos = si.nMax - si.nPage + 1;

int newPos = 0;

int zDelta = HIWORD(wParam);
if (zDelta == 120)
{
//向上滚动
newPos = lastPos - maxPos * 0.2;
}
else
{
//向下滚动
newPos = lastPos + maxPos * 0.2;
}
setPos(hWnd,newPos);
return 0;
}
LRESULT CALLBACK HandleVScroll(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
int nScrollCode = (int)LOWORD(wParam);
int nPos = (short int)HIWORD(wParam);

SCROLLINFO si = {sizeof(SCROLLINFO),
SIF_PAGE|SIF_POS|SIF_RANGE|SIF_TRACKPOS, 0, 0, 0, 0,
0};
GetScrollInfo (hWnd, SB_VERT, &si);

int lastPos = si.nPos;
int newPos = lastPos;

//设置nPage以后 nMax实际值为 si.nMax - si.nPage + 1
int maxPos = 0;
if (si.nPage == 0)
maxPos = si.nMax;
else
maxPos = si.nMax - si.nPage + 1;

switch (nScrollCode)
{
case SB_PAGEDOWN:
{
newPos = lastPos + maxPos * 0.2;
break;
}
case SB_PAGEUP:
{
newPos = lastPos - maxPos * 0.2;
break;
}
case SB_TOP:
{
newPos = 0;
break;
}
case SB_BOTTOM:
{
newPos = maxPos;
break;
}
case SB_THUMBPOSITION:
{
break;
}
case SB_THUMBTRACK:
{
newPos = nPos;
break;
}
case SB_LINEUP:
{
newPos = lastPos - maxPos * 0.1;
break;
}
case SB_LINEDOWN:
{
newPos = lastPos + maxPos * 0.1;
break;
}
}

setPos(hWnd,newPos);
return 0;
}
//
//  函数: WndProc(HWND, UINT, WPARAM, LPARAM)
//
//  目的: 处理主窗口的消息。
//
//  WM_COMMAND  - 处理应用程序菜单
//  WM_PAINT    - 绘制主窗口
//  WM_DESTROY  - 发送退出消息并返回
//
//
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
int wmId, wmEvent;
PAINTSTRUCT ps;
HDC hdc;

switch (message)
{
case WM_COMMAND:
wmId    = LOWORD(wParam);
wmEvent = HIWORD(wParam);
// 分析菜单选择:
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_PAINT:
{
hdc = BeginPaint(hWnd, &ps);
// TODO: 在此添加任意绘图代码...
EndPaint(hWnd, &ps);
break;
}

case WM_MOUSEWHEEL:
{
return HandleMouseWheel(hWnd,message,wParam,lParam);
}
case WM_VSCROLL:
{
return HandleVScroll(hWnd,message,wParam,lParam);
}
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}

// “关于”框的消息处理程序。
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;
}