Win32 鼠标消息 - 客户区鼠标消息、非客户区鼠标消息、击中测试、鼠标滚轮
注：以下内容为学习笔记，多数是从书本、资料中得来，只为加深印象，及日后参考。然而本人表达能力较差，写的不好。因非翻译、非转载，只好选原创，但多数乃摘抄，实为惭愧。但若能帮助一二访客，幸甚！
注：以下内容多数摘自《Windows程序设计》
1. 鼠标信息
判断是否连接了鼠标
fMouse = GetSystemMetrics(SM_MOUSEPRESENT);鼠标按钮个数
cButtons = GetSystemMetrics(SM_CMOUSEBUTTONS);2.客户区鼠标消息
windows只把键盘消息发送到当前具有输入焦点的窗口。鼠标消息则不同：当鼠标经过窗口或在窗口内被单击，则即使窗口是非活动窗口或不带输入焦点，窗口过程还是会收到鼠标消息。Windows定义了21种鼠标消息。其中11种消息与客户区无关，称为“非客户区消息”。
鼠标消息，参数lParam包含了鼠标的位置信息，低位字节表示x坐标，高位字节表示y坐标，它们都是相对于窗口客户区左上角的相对坐标。
x = LOWORD(lParam);
y = HIWORD(lParam);wParam & MK_SHIFT 非零，表示按下左键同时按下了Shift键。
若在非活动窗口的客户区内按下鼠标左键，Windows会将该窗口变为活动窗口，并向窗口过程发送WM_LBUTTONDOWN消息。
当用户在其他窗口内按下鼠标，再移动到用户窗口，然后释放，次数就会发生用户窗口没有收到WM_LBUTTONDOWN但收到了WM_LBUTTONUP消息。
鼠标处理示例：
/*****************************************************************************
connect.cpp -- Connect-the-Dots Mouse Demo Program
*****************************************************************************/
#include
#define MAXPOINTS 1000
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT("Connect");
HWND hwnd;
MSG msg;
WNDCLASS wndclass;
wndclass.style = CS_HREDRAW | CS_VREDRAW;
wndclass.lpfnWndProc = WndProc;
wndclass.cbClsExtra = 0;
wndclass.cbWndExtra = 0;
wndclass.hInstance = hInstance;
wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
wndclass.lpszMenuName = NULL;
wndclass.lpszClassName = szAppName;
if (!RegisterClass(&wndclass))
{
MessageBox(NULL, TEXT("This program requires windows NT!"), szAppName, MB_ICONERROR);
return 0;
}
hwnd = CreateWindow(szAppName, // window class name
TEXT("Connect-the-Points Mouse Demo"), // window caption
WS_OVERLAPPEDWINDOW, // window style
CW_USEDEFAULT, // initial x position
CW_USEDEFAULT, // initial y position
CW_USEDEFAULT, // initial x size
CW_USEDEFAULT, // initial y size
NULL, // parent window handle
NULL, // window menu handle
hInstance, // program instance handle
NULL); // creation parameters
ShowWindow(hwnd, iCmdShow);
UpdateWindow(hwnd);
while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}
LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static POINT pt[MAXPOINTS];
static int iCount;
int i, j;
HDC hdc;
PAINTSTRUCT ps;
switch (message)
{
case WM_LBUTTONDOWN:
iCount = 0;
InvalidateRect(hwnd, NULL, TRUE);
return 0;
case WM_MOUSEMOVE:
if (wParam & MK_LBUTTON && iCount < 1000)
{
pt[iCount].x = LOWORD(lParam);
pt[iCount].y = HIWORD(lParam);
iCount++;
hdc = GetDC(hwnd);
SetPixel(hdc, LOWORD(lParam), HIWORD(lParam), 0);
ReleaseDC(hwnd, hdc);
}
return 0;
case WM_LBUTTONUP:
InvalidateRect(hwnd, NULL, FALSE);
return 0;
case WM_PAINT:
hdc = BeginPaint(hwnd, &ps);
SetCursor(LoadCursor(NULL, IDC_WAIT));
ShowCursor(TRUE);
for (i = 0; i < iCount-1; i++)
for (j = i+1; j < iCount; j++)
{
MoveToEx(hdc, pt[i].x, pt[i].y, NULL);
LineTo(hdc, pt[j].x, pt[j].y);
}
ShowCursor(FALSE);
SetCursor(LoadCursor(NULL, IDC_ARROW));
EndPaint(hwnd, &ps);
return 0;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hwnd, message, wParam, lParam);
}
3.处理Shift键
if (wParam & MK_SHIFT)
{
if (wParam & MK_CONTROL)
{
// 按下Shift+Ctrl组合键
}
else
{
// 按下Shift键
{
}
else
{
if (wParam & MK_CONTROL)
{
// 按下Ctrl键
}
else
{
// Shift 和Ctrl 都没按下
}
}4.鼠标双击
如果想让窗口过程接收鼠标双击消息，RegisterClass中必须在窗口风格字段中包含标示符CS_DBLCLKS:
wndclass.style = CS_HREDRAW | CS_VERDRAW | CS_DBLCLKS;5.非客户区鼠标消息
窗口的非客户区包括标题栏、菜单和窗口滚动条。
非客户区消息的wParam表示非客户区鼠标移动或单击的位置。lParam的低位字包含x坐标、高位字包含y坐标。但是这些坐标是屏幕坐标，而不是前面的客户区消息中的客户区坐标。
这两种坐标的相互转化：
ScreenToClient(hwnd, &pt);
ClientToScreen(hwnd, &pt);6.击中测试
击中测试包含了对传递到窗口过程的x和y坐标的一些运算，其中x和y的值包含在鼠标消息的参数lParam中。
简单示例：
/*****************************************************************************
checker.cpp -- Mouse Hit-Test Demo Program ver1
*****************************************************************************/
#include
#define DIVISIONS 5
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT("Checker1");
HWND hwnd;
MSG msg;
WNDCLASS wndclass;
wndclass.style = CS_HREDRAW | CS_VREDRAW;
wndclass.lpfnWndProc = WndProc;
wndclass.cbClsExtra = 0;
wndclass.cbWndExtra = 0;
wndclass.hInstance = hInstance;
wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
wndclass.lpszMenuName = NULL;
wndclass.lpszClassName = szAppName;
if (!RegisterClass(&wndclass))
{
MessageBox(NULL, TEXT("This program requires windows NT!"), szAppName, MB_ICONERROR);
return 0;
}
hwnd = CreateWindow(szAppName, // window class name
TEXT("Checker1 Mouse Hit-Test Demo"), // window caption
WS_OVERLAPPEDWINDOW, // window style
CW_USEDEFAULT, // initial x position
CW_USEDEFAULT, // initial y position
CW_USEDEFAULT, // initial x size
CW_USEDEFAULT, // initial y size
NULL, // parent window handle
NULL, // window menu handle
hInstance, // program instance handle
NULL); // creation parameters
ShowWindow(hwnd, iCmdShow);
UpdateWindow(hwnd);
while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}
LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static BOOL fState[DIVISIONS][DIVISIONS];
static int cxBlock, cyBlock;
int x, y;
HDC hdc;
PAINTSTRUCT ps;
RECT rect;
switch (message)
{
case WM_SIZE:
cxBlock = LOWORD(lParam) / DIVISIONS;
cyBlock = HIWORD(lParam) / DIVISIONS;
return 0;
case WM_LBUTTONDOWN:
x = LOWORD(lParam) / cxBlock;
y = HIWORD(lParam) / cyBlock;
if (x < DIVISIONS && y < DIVISIONS)
{
fState[x][y] ^= 1;
rect.left = x * cxBlock;
rect.top = y * cyBlock;
rect.right = (x+1) * cxBlock;
rect.bottom = (y+1) * cyBlock;
InvalidateRect(hwnd, &rect, FALSE);
}
else
{
MessageBeep(0);
}
return 0;
case WM_PAINT:
hdc = BeginPaint(hwnd, &ps);
for (x = 0; x < DIVISIONS; x++)
{
for (y = 0; y < DIVISIONS; y++)
{
Rectangle(hdc, x*cxBlock, y*cyBlock, (x+1)*cxBlock, (y+1)*cyBlock);
if (fState[x][y])
{
MoveToEx(hdc, x*cxBlock, y*cyBlock, NULL);
LineTo (hdc, (x+1)*cxBlock, (y+1)*cyBlock);
MoveToEx(hdc, x*cxBlock, (y+1)*cyBlock, NULL);
LineTo (hdc, (x+1)*cxBlock, y*cyBlock);
}
}
}
EndPaint(hwnd, &ps);
return 0;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hwnd, message, wParam, lParam);
}
7.使用键盘模仿鼠标：
为上面的程序添加键盘接口：
case WM_SETFOCUS:
ShowCursor(TRUE);
return 0;
case WM_KILLFOCUS:
ShowCursor(FALSE);
return 0;
case WM_KEYDOWN:
GetCursorPos(&point);
ScreenToClient(hwnd, &point);
x = max(0, min(DIVISIONS-1, point.x/cxBlock));
y = max(0, min(DIVISIONS-1, point.y/cyBlock));
switch (wParam)
{
case VK_UP:
y--;
break;
case VK_DOWN:
y++;
break;
case VK_LEFT:
x--;
break;
case VK_RIGHT:
x++;
break;
case VK_HOME:
x = y = 0;
break;
case VK_END:
x = y = DIVISIONS-1;
break;
case VK_SPACE:
case VK_RETURN:
SendMessage(hwnd, WM_LBUTTONDOWN, MK_LBUTTON, MAKELONG(x * cxBlock, y * cyBlock));
break;
}
x = (x + DIVISIONS) % DIVISIONS;
y = (y + DIVISIONS) % DIVISIONS;
point.x = x*cxBlock + cxBlock/2;
point.y = y*cyBlock + cyBlock/2;
ClientToScreen(hwnd, &point);
SetCursorPos(point.x, point.y);
return 0;8.使用子窗口
创建25个子窗口，用于处理鼠标单击操作：
/*****************************************************************************
checker.cpp -- Mouse Hit-Test Demo Program ver3
*****************************************************************************/
#include
#define DIVISIONS 5
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
LRESULT CALLBACK ChildWindProc(HWND, UINT, WPARAM, LPARAM);
TCHAR szChildClass[] = TEXT("Checker3_child");
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT("Checker3");
HWND hwnd;
MSG msg;
WNDCLASS wndclass;
wndclass.style = CS_HREDRAW | CS_VREDRAW;
wndclass.lpfnWndProc = WndProc;
wndclass.cbClsExtra = 0;
wndclass.cbWndExtra = 0;
wndclass.hInstance = hInstance;
wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
wndclass.lpszMenuName = NULL;
wndclass.lpszClassName = szAppName;
if (!RegisterClass(&wndclass))
{
MessageBox(NULL, TEXT("This program requires windows NT!"), szAppName, MB_ICONERROR);
return 0;
}
wndclass.lpfnWndProc = ChildWindProc;
wndclass.cbWndExtra = sizeof(long);
wndclass.hIcon = NULL;
wndclass.lpszClassName = szChildClass;
RegisterClass(&wndclass);
hwnd = CreateWindow(szAppName, // window class name
TEXT("Checker2 Mouse Hit-Test Demo"), // window caption
WS_OVERLAPPEDWINDOW, // window style
CW_USEDEFAULT, // initial x position
CW_USEDEFAULT, // initial y position
CW_USEDEFAULT, // initial x size
CW_USEDEFAULT, // initial y size
NULL, // parent window handle
NULL, // window menu handle
hInstance, // program instance handle
NULL); // creation parameters
ShowWindow(hwnd, iCmdShow);
UpdateWindow(hwnd);
while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}
LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static HWND hwndChild[DIVISIONS][DIVISIONS];
int cxBlock, cyBlock, x, y;
switch (message)
{
case WM_CREATE:
for (x = 0; x < DIVISIONS; x++)
for (y = 0; y < DIVISIONS; y++)
hwndChild[x][y] = CreateWindow(szChildClass, NULL, WS_CHILDWINDOW | WS_VISIBLE,
0, 0, 0, 0,
hwnd, (HMENU)(y << 8 | x),
(HINSTANCE)GetWindowLong(hwnd, GWL_HINSTANCE),
NULL);
return 0;
case WM_SIZE:
cxBlock = LOWORD(lParam) / DIVISIONS;
cyBlock = HIWORD(lParam) / DIVISIONS;
for (x = 0; x < DIVISIONS; x++)
for (y = 0; y < DIVISIONS; y++)
MoveWindow(hwndChild[x][y], x*cxBlock, y*cyBlock, cxBlock, cyBlock, TRUE);
return 0;
case WM_LBUTTONDOWN:
MessageBeep(0);
return 0;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hwnd, message, wParam, lParam);
}
LRESULT CALLBACK ChildWindProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
HDC hdc;
PAINTSTRUCT ps;
RECT rect;
switch (message)
{
case WM_CREATE:
SetWindowLong(hwnd, 0, 0);
return 0;
case WM_LBUTTONDOWN:
SetWindowLong(hwnd, 0, 1 ^ GetWindowLong(hwnd, 0));
InvalidateRect(hwnd, NULL, FALSE);
return 0;
case WM_PAINT:
hdc = BeginPaint(hwnd, &ps);
GetClientRect(hwnd, &rect);
Rectangle(hdc, 0, 0, rect.right, rect.bottom);
if (GetWindowLong(hwnd, 0))
{
MoveToEx(hdc, 0, 0, NULL);
LineTo(hdc, rect.right, rect.bottom);
MoveToEx(hdc, 0, rect.bottom, NULL);
LineTo(hdc, rect.right, 0);
}
EndPaint(hwnd, &ps);
return 0;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hwnd, message, wParam, lParam);
} 添加键盘控制：
为每个子窗口定义一个唯一的“子窗口ID”，ID值由矩形的x和y坐标组合而成。为了获取一个具体子窗口ID，可用
idChild = GetWindowLong(hwndChild, GWL_ID);
idChild = GetDlgCtrlID(hwndCHild);hwndChild = GetDlgItem(hwndParent, idChild);代码如下：
/*****************************************************************************
checker.cpp -- Mouse Hit-Test Demo Program ver3
*****************************************************************************/
#include
#define DIVISIONS 5
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
LRESULT CALLBACK ChildWindProc(HWND, UINT, WPARAM, LPARAM);
TCHAR szChildClass[] = TEXT("Checker3_child");
int idFocus = 0;
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT("Checker3");
HWND hwnd;
MSG msg;
WNDCLASS wndclass;
wndclass.style = CS_HREDRAW | CS_VREDRAW;
wndclass.lpfnWndProc = WndProc;
wndclass.cbClsExtra = 0;
wndclass.cbWndExtra = 0;
wndclass.hInstance = hInstance;
wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
wndclass.lpszMenuName = NULL;
wndclass.lpszClassName = szAppName;
if (!RegisterClass(&wndclass))
{
MessageBox(NULL, TEXT("This program requires windows NT!"), szAppName, MB_ICONERROR);
return 0;
}
wndclass.lpfnWndProc = ChildWindProc;
wndclass.cbWndExtra = sizeof(long);
wndclass.hIcon = NULL;
wndclass.lpszClassName = szChildClass;
RegisterClass(&wndclass);
hwnd = CreateWindow(szAppName, // window class name
TEXT("Checker2 Mouse Hit-Test Demo"), // window caption
WS_OVERLAPPEDWINDOW, // window style
CW_USEDEFAULT, // initial x position
CW_USEDEFAULT, // initial y position
CW_USEDEFAULT, // initial x size
CW_USEDEFAULT, // initial y size
NULL, // parent window handle
NULL, // window menu handle
hInstance, // program instance handle
NULL); // creation parameters
ShowWindow(hwnd, iCmdShow);
UpdateWindow(hwnd);
while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}
LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static HWND hwndChild[DIVISIONS][DIVISIONS];
int cxBlock, cyBlock, x, y;
switch (message)
{
case WM_CREATE:
for (x = 0; x < DIVISIONS; x++)
for (y = 0; y < DIVISIONS; y++)
hwndChild[x][y] = CreateWindow(szChildClass, NULL, WS_CHILDWINDOW | WS_VISIBLE,
0, 0, 0, 0,
hwnd, (HMENU)(y << 8 | x),
(HINSTANCE)GetWindowLong(hwnd, GWL_HINSTANCE),
NULL);
return 0;
case WM_SIZE:
cxBlock = LOWORD(lParam) / DIVISIONS;
cyBlock = HIWORD(lParam) / DIVISIONS;
for (x = 0; x < DIVISIONS; x++)
for (y = 0; y < DIVISIONS; y++)
MoveWindow(hwndChild[x][y], x*cxBlock, y*cyBlock, cxBlock, cyBlock, TRUE);
return 0;
case WM_LBUTTONDOWN:
MessageBeep(0);
return 0;
case WM_SETFOCUS:
MessageBeep(0);
return 0;
case WM_KEYDOWN:
x = idFocus & 0xFF;
y = idFocus >> 8;
switch (wParam)
{
case VK_UP:
y--;
break;
case VK_DOWN:
y++;
break;
case VK_LEFT:
x--;
break;
case VK_RIGHT:
x++;
break;
case VK_HOME:
x = y = 0;
break;
case VK_END:
x = y = DIVISIONS-1;
break;
default:
return 0;
}
x = (x + DIVISIONS) % DIVISIONS;
y = (y + DIVISIONS) % DIVISIONS;
idFocus = y << 8 | x;
SetFocus(GetDlgItem(hwnd, idFocus));
return 0;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hwnd, message, wParam, lParam);
}
LRESULT CALLBACK ChildWindProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
HDC hdc;
PAINTSTRUCT ps;
RECT rect;
switch (message)
{
case WM_CREATE:
SetWindowLong(hwnd, 0, 0);
return 0;
case WM_KEYDOWN:
if (wParam != VK_RETURN && wParam != VK_SPACE)
{
SendMessage(GetParent(hwnd), message, wParam, lParam);
return 0;
}
case WM_LBUTTONDOWN:
SetWindowLong(hwnd, 0, 1 ^ GetWindowLong(hwnd, 0));
SetFocus(hwnd);
InvalidateRect(hwnd, NULL, FALSE);
return 0;
case WM_SETFOCUS:
idFocus = GetWindowLong(hwnd, GWL_ID);
case WM_KILLFOCUS:
InvalidateRect(hwnd, NULL, TRUE);
return 0;
case WM_PAINT:
hdc = BeginPaint(hwnd, &ps);
GetClientRect(hwnd, &rect);
Rectangle(hdc, 0, 0, rect.right, rect.bottom);
if (GetWindowLong(hwnd, 0))
{
MoveToEx(hdc, 0, 0, NULL);
LineTo(hdc, rect.right, rect.bottom);
MoveToEx(hdc, 0, rect.bottom, NULL);
LineTo(hdc, rect.right, 0);
}
if (hwnd == GetFocus())
{
rect.left += rect.right / 10;
rect.right -= rect.left;
rect.top += rect.bottom / 10;
rect.bottom -= rect.top;
SelectObject(hdc, GetStockObject(NULL_BRUSH));
SelectObject(hdc, CreatePen(PS_DASH, 0, 0));
Rectangle(hdc, rect.left, rect.top, rect.right, rect.bottom);
DeleteObject(SelectObject(hdc, GetStockObject(BLACK_PEN)));
}
EndPaint(hwnd, &ps);
return 0;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hwnd, message, wParam, lParam);
} ９.捕获鼠标
当鼠标处于窗口范围之外时，“捕获”鼠标。
调用SetCapture(hwnd); Windows会将所有鼠标消息发送给窗口句柄为hwnd的窗口的窗口过程。鼠标消息总是以客户区消息的形式出现，即使鼠标位于窗口的非客户区。
调用ReleaseCapture(); 释放鼠标
/*****************************************************************************
blockout.cpp -- Mouse Button Demo Program
*****************************************************************************/
#include
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT("BlokOut1");
HWND hwnd;
MSG msg;
WNDCLASS wndclass;
wndclass.style = CS_HREDRAW | CS_VREDRAW;
wndclass.lpfnWndProc = WndProc;
wndclass.cbClsExtra = 0;
wndclass.cbWndExtra = 0;
wndclass.hInstance = hInstance;
wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
wndclass.lpszMenuName = NULL;
wndclass.lpszClassName = szAppName;
if (!RegisterClass(&wndclass))
{
MessageBox(NULL, TEXT("This program requires windows NT!"), szAppName, MB_ICONERROR);
return 0;
}
hwnd = CreateWindow(szAppName, // window class name
TEXT("Checker2 Mouse Hit-Test Demo"), // window caption
WS_OVERLAPPEDWINDOW, // window style
CW_USEDEFAULT, // initial x position
CW_USEDEFAULT, // initial y position
CW_USEDEFAULT, // initial x size
CW_USEDEFAULT, // initial y size
NULL, // parent window handle
NULL, // window menu handle
hInstance, // program instance handle
NULL); // creation parameters
ShowWindow(hwnd, iCmdShow);
UpdateWindow(hwnd);
while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}
void DrawBoxOutline(HWND hwnd, POINT ptBeg, POINT ptEnd)
{
HDC hdc;
hdc = GetDC(hwnd);
SetROP2(hdc, R2_NOT);
SelectObject(hdc, GetStockObject(NULL_BRUSH));
Rectangle(hdc, ptBeg.x, ptBeg.y, ptEnd.x, ptEnd.y);
ReleaseDC(hwnd, hdc);
}
LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static BOOL fBlocking, fValidBox;
static POINT ptBeg, ptEnd, ptBoxBeg, ptBoxEnd;
HDC hdc;
PAINTSTRUCT ps;
switch (message)
{
case WM_LBUTTONDOWN:
ptBeg.x = ptEnd.x = LOWORD(lParam);
ptBeg.y = ptEnd.y = HIWORD(lParam);
DrawBoxOutline(hwnd, ptBeg, ptEnd);
SetCapture(hwnd);
SetCursor(LoadCursor(NULL, IDC_CROSS));
fBlocking = TRUE;
return 0;
case WM_MOUSEMOVE:
if (fBlocking)
{
SetCursor(LoadCursor(NULL, IDC_CROSS));
DrawBoxOutline(hwnd, ptBeg, ptEnd);
ptEnd.x = LOWORD(lParam);
ptEnd.y = HIWORD(lParam);
DrawBoxOutline(hwnd, ptBeg, ptEnd);
}
return 0;
case WM_LBUTTONUP:
if (fBlocking)
{
DrawBoxOutline(hwnd, ptBeg, ptEnd);
ptBoxBeg = ptBeg;
ptBoxEnd.x = LOWORD(lParam);
ptBoxEnd.y = HIWORD(lParam);
ReleaseCapture();
SetCursor(LoadCursor(NULL, IDC_ARROW));
fBlocking = FALSE;
fValidBox = TRUE;
InvalidateRect(hwnd, NULL, TRUE);
}
return 0;
case WM_CHAR:
if (fBlocking & (wParam == '\x1B'))
{
DrawBoxOutline(hwnd, ptBeg, ptEnd);
ReleaseCapture();
SetCursor(LoadCursor(NULL, IDC_ARROW));
fBlocking = FALSE;
}
return 0;
case WM_PAINT:
hdc = BeginPaint(hwnd, &ps);
if (fValidBox)
{
SelectObject(hdc, GetStockObject(BLACK_BRUSH));
Rectangle(hdc, ptBoxBeg.x, ptBoxBeg.y, ptBoxEnd.x, ptBoxEnd.y);
}
if (fBlocking)
{
SetROP2(hdc, R2_NOT);
SelectObject(hdc, GetStockObject(NULL_BRUSH));
Rectangle(hdc, ptBeg.x, ptBeg.y, ptBoxEnd.x, ptBoxEnd.y);
}
EndPaint(hwnd,&ps);
return 0;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hwnd, message, wParam, lParam);
}
LRESULT CALLBACK ChildWindProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
HDC hdc;
PAINTSTRUCT ps;
RECT rect;
switch (message)
{
case WM_CREATE:
SetWindowLong(hwnd, 0, 0);
return 0;
case WM_KEYDOWN:
if (wParam != VK_RETURN && wParam != VK_SPACE)
{
SendMessage(GetParent(hwnd), message, wParam, lParam);
return 0;
}
case WM_LBUTTONDOWN:
SetWindowLong(hwnd, 0, 1 ^ GetWindowLong(hwnd, 0));
SetFocus(hwnd);
InvalidateRect(hwnd, NULL, FALSE);
return 0;
case WM_PAINT:
hdc = BeginPaint(hwnd, &ps);
GetClientRect(hwnd, &rect);
Rectangle(hdc, 0, 0, rect.right, rect.bottom);
if (GetWindowLong(hwnd, 0))
{
MoveToEx(hdc, 0, 0, NULL);
LineTo(hdc, rect.right, rect.bottom);
MoveToEx(hdc, 0, rect.bottom, NULL);
LineTo(hdc, rect.right, 0);
}
if (hwnd == GetFocus())
{
rect.left += rect.right / 10;
rect.right -= rect.left;
rect.top += rect.bottom / 10;
rect.bottom -= rect.top;
SelectObject(hdc, GetStockObject(NULL_BRUSH));
SelectObject(hdc, CreatePen(PS_DASH, 0, 0));
Rectangle(hdc, rect.left, rect.top, rect.right, rect.bottom);
DeleteObject(SelectObject(hdc, GetStockObject(BLACK_PEN)));
}
EndPaint(hwnd, &ps);
return 0;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hwnd, message, wParam, lParam);
} 10.鼠标滚轮
滚轮的滚动使Windows产生WM_MOUSEWHEEL消息，并发送给具有输入焦点的窗口。lParam包含鼠标的位置信息，这些坐标是相对于屏幕左上角的坐标，而不是相对客户区的坐标。
LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
// cxChar平均字符宽度，cyChar字符的总高度（包括外部间距），cxCaps大写字符的平均宽度
// 等宽字体中，cxCaps等于cxChar，变宽字体中，cxCaps等于cxChar的1.5倍
static int cxChar, cxCaps, cyChar, cxClient, cyClient, iMaxWidth, iVscrollPos;
static int iDeltaPerLine, iAccumDelta;
HDC hdc;
int i, x, y, iVertPos, iHorzPos, iPaintBeg, iPaintEnd;
PAINTSTRUCT ps;
SCROLLINFO si;
TCHAR szBuffer[10];
TEXTMETRIC tm;
ULONG ulScrollLines;
switch (message)
{
case WM_CREATE:
hdc = GetDC(hwnd);
GetTextMetrics(hdc, &tm); // 获取系统默认字体的尺寸
cxChar = tm.tmAveCharWidth;
// tmPitchAndFamily为1表示变宽字体，为0表示等宽字体
cxCaps = (tm.tmPitchAndFamily & 1 ? 3 : 2) * cxChar / 2;
cyChar = tm.tmHeight + tm.tmExternalLeading;
ReleaseDC(hwnd, hdc);
iMaxWidth = 40*cxChar + 22*cxCaps;
case WM_SETTINGCHANGE:
SystemParametersInfo(SPI_GETWHEELSCROLLLINES, 0, &ulScrollLines, 0);
if (ulScrollLines)
iDeltaPerLine = WHEEL_DELTA / ulScrollLines;
else
iDeltaPerLine = 0;
case WM_SIZE:
cxClient = LOWORD(lParam);
cyClient = HIWORD(lParam);
si.cbSize = sizeof(si);
si.fMask = SIF_RANGE | SIF_PAGE;
si.nMin = 0;
si.nMax = NUMLINES-1;
si.nPage = cyClient / cyChar;
SetScrollInfo(hwnd, SB_VERT, &si, TRUE);
si.cbSize = sizeof(si);
si.fMask = SIF_RANGE | SIF_PAGE;
si.nMin = 0;
si.nMax = 2 + iMaxWidth/cxChar;
si.nPage = cxClient / cxChar;
SetScrollInfo(hwnd, SB_HORZ, &si, TRUE);
return 0;
case WM_VSCROLL:
si.cbSize = sizeof(si);
si.fMask = SIF_ALL;
GetScrollInfo(hwnd, SB_VERT, &si);
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);
if (si.nPos != iVertPos)
{
ScrollWindow(hwnd, 0, cyChar*(iVertPos-si.nPos), NULL, NULL);
UpdateWindow(hwnd);
}
return 0;
case WM_HSCROLL:
si.cbSize = sizeof(si);
si.fMask = SIF_ALL;
GetScrollInfo(hwnd, SB_HORZ, &si);
iHorzPos = si.nPos;
switch (LOWORD(wParam))
{
case SB_LINELEFT:
si.nPos -= 1;
break;
case SB_LINERIGHT:
si.nPos += 1;
break;
case SB_PAGELEFT:
si.nPos -= si.nPage;
break;
case SB_PAGERIGHT:
si.nPos += si.nPage;
break;
case SB_THUMBPOSITION:
si.nPos = si.nTrackPos;
break;
default:
break;
}
si.fMask = SIF_POS;
SetScrollInfo(hwnd, SB_HORZ, &si, TRUE);
GetScrollInfo(hwnd, SB_HORZ, &si);
if (si.nPos != iHorzPos)
{
ScrollWindow(hwnd, cxChar*(iHorzPos-si.nPos), 0, NULL, NULL);
UpdateWindow(hwnd);
}
return 0;
case WM_KEYDOWN:
switch (wParam)
{
case VK_HOME:
SendMessage(hwnd, WM_VSCROLL, SB_TOP, 0);
break;
case VK_END:
SendMessage(hwnd, WM_VSCROLL, SB_BOTTOM, 0);
break;
case VK_PRIOR:
SendMessage(hwnd, WM_VSCROLL, SB_PAGEUP, 0);
break;
case VK_NEXT:
SendMessage(hwnd, WM_VSCROLL, SB_PAGEDOWN, 0);
break;
case VK_UP:
SendMessage(hwnd, WM_VSCROLL, SB_LINEUP, 0);
break;
case VK_DOWN:
SendMessage(hwnd, WM_VSCROLL, SB_LINEDOWN, 0);
break;
case VK_LEFT:
SendMessage(hwnd, WM_HSCROLL, SB_PAGEUP, 0);
break;
case VK_RIGHT:
SendMessage(hwnd, WM_HSCROLL, SB_PAGEDOWN, 0);
break;
}
return 0;
case WM_MOUSEWHEEL:
if (iDeltaPerLine == 0)
break;
iAccumDelta += (short)HIWORD(wParam);
while (iAccumDelta >= iDeltaPerLine)
{
SendMessage(hwnd, WM_VSCROLL, SB_LINEUP, 0);
iAccumDelta -= iDeltaPerLine;
}
while (iAccumDelta <= -iDeltaPerLine)
{
SendMessage(hwnd, WM_VSCROLL, SB_LINEDOWN, 0);
iAccumDelta += iDeltaPerLine;
}
case WM_PAINT:
hdc = BeginPaint(hwnd, &ps);
si.cbSize = sizeof(si);
si.fMask = SIF_POS;
GetScrollInfo(hwnd, SB_VERT, &si);
iVertPos = si.nPos;
GetScrollInfo(hwnd, SB_HORZ, &si);
iHorzPos = si.nPos;
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 + 22*cxCaps, y, sysmetrics[i].szDesc, lstrlen(sysmetrics[i].szDesc));
SetTextAlign(hdc, TA_RIGHT | TA_TOP);
TextOut(hdc, x + 22*cxCaps + 40*cxChar, y, szBuffer, wsprintf(szBuffer, TEXT("%5d"),
GetSystemMetrics(sysmetrics[i].iIndex)));
// 将对齐方式设回正常方式
SetTextAlign(hdc, TA_LEFT | TA_TOP);
}
EndPaint(hwnd, &ps);
return 0;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hwnd, message, wParam, lParam);
}
可以用滚轮了~