文章目录

头文件

#pragma once
#include <Windows.h>

#define NUMLINES ((int)(sizeof sysmetrics/sizeof sysmetrics[0]))

struct {
int Index;
char szLabel[100];//第一列内容
char szDesc[50];//第二列内容
}sysmetrics[] = {
SM_CXSCREEN,"各位同学大家好","官方标准提示数据",
SM_CYSCREEN,"C/C++高级工程师","官方标准发布版本"
};

NUMLINES 宏定义是为了得到sysmetrics的数量

源文件

#include <Windows.h>
#include "systems.h"

LRESULT CALLBACK WndProcFun(HWND, UINT, WPARAM, LPARAM);

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT("CKDemoTest");
HWND hwnd;
MSG msg;
WNDCLASS windclass;

windclass.style = CS_HREDRAW | CS_VREDRAW;
windclass.lpfnWndProc = WndProcFun;
windclass.cbClsExtra = 0;
windclass.cbWndExtra = 0;
windclass.hInstance = hInstance;
windclass.hIcon = NULL;
windclass.hCursor = LoadCursor(NULL, IDC_ARROW);
windclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
windclass.lpszMenuName = NULL;
windclass.lpszClassName = szAppName;

if (!RegisterClass(&windclass))
{
// 提示信息自己完成 
return 0;
}

hwnd = CreateWindow(szAppName, TEXT("第五讲 键盘控制窗口垂直水平滚事件"), WS_OVERLAPPEDWINDOW | WS_VSCROLL | WS_HSCROLL,CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, hInstance, NULL);

ShowWindow(hwnd, iCmdShow);
UpdateWindow(hwnd);

while (GetMessage(&msg, NULL, 0, 0)) {
TranslateMessage(&msg);
DispatchMessage(&msg);
}

return msg.wParam;

}


LRESULT CALLBACK WndProcFun(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static int cxChar, cxCaps, cyChar, cxClient, cyClient, iMaxWidth;
HDC hdc;
int i, x, y, iVertPos, iHorzPos=0, iPaintBeg, iPaintEnd;
PAINTSTRUCT ps;
SCROLLINFO si;
TCHAR szBuffer[20];
TEXTMETRIC tm;

switch (message)
{
case WM_CREATE:  // 应用程序创建一个窗口
hdc = GetDC(hwnd);
GetTextMetrics(hdc, &tm);
cxChar = tm.tmAveCharWidth;
cyChar = tm.tmHeight + tm.tmExternalLeading;
cxCaps = (tm.tmPitchAndFamily & 1 ? 3 : 2)*cxChar / 2;
ReleaseDC(hwnd, hdc);

// 保存三列宽度
iMaxWidth = 40 * cxChar + 22 * cxCaps;
return 0;

case WM_SIZE:// 改变一个窗口的大小
cxClient = LOWORD(lParam);
cyClient = HIWORD(lParam);

// 设置垂直滚动条范围 和 页面大小
si.cbSize = sizeof(si);

// SIF_RANGE 设置滚动范围值
// SIF_PAGE 设置滚动页码
si.fMask = SIF_RANGE | SIF_PAGE;
si.nMin = 0;
si.nMax = NUMLINES - 1;
si.nPage = cyClient / cyChar;
// SB_VERT 设置所给定的窗体上标准垂直滚动条参数
SetScrollInfo(hwnd, SB_VERT, &si, TRUE);
return 0;

case WM_PAINT:
hdc = BeginPaint(hwnd, &ps);

// 获取垂直滚动条位置
si.cbSize = sizeof(si);
si.fMask = SIF_POS;
GetScrollInfo(hwnd, SB_VERT, &si);
iVertPos = si.nPos;

// 查找绘制限制
iPaintBeg = max(0, iVertPos + ps.rcPaint.top / cyChar);
iPaintEnd = min(NUMLINES - 1, iVertPos + ps.rcPaint.bottom / cyChar);

for (i = iPaintBeg; i <= iPaintEnd; i++)
{
x = cxChar * (1 - iHorzPos);
y = cyChar * (i - iVertPos);

TextOut(hdc, x, y, sysmetrics[i].szLabel, lstrlen(sysmetrics[i].szLabel));
TextOut(hdc, x+80*cxCaps, y, sysmetrics[i].szDesc, lstrlen(sysmetrics[i].szDesc));
SetTextAlign(hdc, TA_RIGHT | TA_TOP);// 指定设备环境设置文字对齐标志

TextOut(hdc, x + 100 * cxCaps + 40 * cxChar, y, szBuffer, wsprintf(szBuffer, TEXT("%d"), GetSystemMetrics(sysmetrics[i].Index)));
SetTextAlign(hdc, TA_LEFT | TA_TOP);
}

EndPaint(hwnd, &ps);
return 0;

case WM_KEYDOWN:
switch (wParam)
{
case VK_HOME:   // Home
SendMessage(hwnd, WM_VSCROLL, SB_TOP, 0);// 消息发送到一个或多个窗口
break;

case VK_END:// End
SendMessage(hwnd, WM_VSCROLL, SB_BOTTOM, 0);
break;

case VK_PRIOR:// Page Up
SendMessage(hwnd, WM_VSCROLL, SB_PAGEUP, 0);
break;

case VK_NEXT:// Page Down
SendMessage(hwnd, WM_VSCROLL, SB_PAGEDOWN, 0);
break;

case VK_UP:// 箭头向上
SendMessage(hwnd, WM_VSCROLL, SB_LINEUP, 0);
break;

case VK_DOWN:// 箭头向下
SendMessage(hwnd, WM_VSCROLL, SB_LINEDOWN, 0);
break;
}
return 0;

case WM_VSCROLL:
// 获取所有垂直滚动条信息
si.cbSize = sizeof(si);
si.fMask = SIF_ALL;// 整个结构都有效
GetScrollInfo(hwnd, SB_VERT, &si);// SB_VERT 设置所绽的窗口上标准垂直滚动条参数

iVertPos = si.nPos;

switch (LOWORD(wParam))
{
case SB_TOP:
si.nPos = si.nMin;
break;

case SB_BOTTOM:
si.nPos = si.nMax;
break;

case SB_LINEUP:
si.nPos -= 1;
break;

case SB_LINEDOWN:
si.nPos +=1;
break;

case SB_PAGEUP:
si.nPos -= si.nPage;
break;

case SB_PAGEDOWN:
si.nPos += si.nPage;
break;

case SB_THUMBTRACK:
si.nPos = si.nTrackPos;
break;

default:
break;

}
si.fMask = SIF_POS;
SetScrollInfo(hwnd, SB_VERT, &si, TRUE);
GetScrollInfo(hwnd, SB_VERT, &si);

// 如果位置已经更改，滚动窗口并且进行更新
if (si.nPos != iVertPos)
{
ScrollWindow(hwnd, 0, cyChar*(iVertPos - si.nPos), NULL, NULL);
UpdateWindow(hwnd);
}

return 0;

case WM_DESTROY:
PostQuitMessage(0);
return 0;
}

return DefWindowProc(hwnd, message, wParam, lParam);
}

运行结果只能垂直滚动，水平滚动参考即可，

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