Change button colors - c++

Question

I want to change button colors when the user click on it.
The main plan is: every month 10th one worker's button go to red and if the worker done his job then click on the button and it going to be green.
I have no idea what to do.
I already have this code. I just created a window and add a button to it:
switch (msg) {
case WM_DESTROY:
PostQuitMessage(0);
break;
case WM_CREATE:
AddButton(hWnd);
break;
default:
return DefWindowProcW(hWnd, msg, wp, lp);
}
}
void AddButton(HWND hWnd)
{
CreateWindowW(L"Button", L"Change colors", WS_VISIBLE | WS_CHILD,
350, 200,
100, 100,
hWnd,
NULL,
NULL,
NULL);
}
So I tried WM_LBUTTONDOWN. I think this is something when the user click on the button the program will do something. I put in the switch(msg) case WM_LBUTTONDOWN:.
But no idea what's next.

Answer 1

Here is a simple demo to show how to detect click on a button, and change the color of button when you click on it.
#pragma comment(linker, "/manifestdependency:\"type='win32' \
name='Microsoft.Windows.Common-Controls' version='6.0.0.0' \
processorArchitecture='*' \
publicKeyToken='6595b64144ccf1df' language='*'\"")
#pragma comment(lib, "comctl32.lib")
#include "stdafx.h"
#include <windows.h>
#include <commctrl.h>
static BOOL flag = false;
ATOM RegisterWndClass(HINSTANCE hInst);
BOOL CreateMainWnd(HINSTANCE hInstance, int nCmdShow);
LRESULT CALLBACK MainWndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam);
HINSTANCE hInst;
int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hInstPrev, LPWSTR lpszCmdLine,
int nCmdShow)
{
INITCOMMONCONTROLSEX icex = { 0 };
icex.dwSize = sizeof(INITCOMMONCONTROLSEX);
icex.dwICC = ICC_LISTVIEW_CLASSES | ICC_USEREX_CLASSES | ICC_BAR_CLASSES |
ICC_COOL_CLASSES | ICC_TAB_CLASSES | ICC_WIN95_CLASSES |
ICC_PROGRESS_CLASS | ICC_PAGESCROLLER_CLASS;
InitCommonControlsEx(&icex);
MSG msg;
hInst = hInstance;
if (!RegisterWndClass(hInstance))
return NULL;
if (!CreateMainWnd(hInstance, nCmdShow))
return NULL;
while (GetMessage(&msg, NULL, NULL, NULL))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
};
ATOM RegisterWndClass(HINSTANCE hInstance)
{
WNDCLASS wndClass = { 0 };
wndClass.style = CS_DBLCLKS;
wndClass.lpfnWndProc = MainWndProc;
wndClass.hInstance = hInstance;
wndClass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wndClass.hCursor = LoadCursor(NULL, IDC_ARROW);
wndClass.hbrBackground = GetSysColorBrush(COLOR_BTNFACE);
wndClass.lpszMenuName = NULL;
wndClass.lpszClassName = L"MainClass";
wndClass.cbClsExtra = 0;
wndClass.cbWndExtra = 0;
return RegisterClass(&wndClass);
}
BOOL CreateMainWnd(HINSTANCE hInstance, int nCmdShow)
{
HWND hWnd = CreateWindow(L"MainClass", L"Buttons sample",
WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX,
GetSystemMetrics(SM_CXSCREEN) / 2 - 115,
GetSystemMetrics(SM_CYSCREEN) / 2 - 50,
230, 100, NULL, NULL, hInstance, NULL);
if (!hWnd)
return FALSE;
ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);
return TRUE;
}
HBITMAP hBitmap = NULL;
LRESULT CALLBACK MainWndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch (msg)
{
case WM_CREATE:
{
// Owner draw button
CreateWindow(L"BUTTON", L"", WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON |
BS_OWNERDRAW, 10, 10, 60, 30, hWnd,
(HMENU)10001, hInst, NULL);
// Custom draw button
CreateWindow(L"BUTTON", L"", WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON, 80,
10, 60, 30, hWnd, (HMENU)10002, hInst, NULL);
// Bitmap button
HWND hBitmapButton = CreateWindow(L"BUTTON", L"", WS_CHILD | WS_VISIBLE
| BS_PUSHBUTTON | BS_BITMAP,
150, 10, 60, 30, hWnd,
(HMENU)10003, hInst, NULL);
HDC hDC = GetDC(hWnd);
HDC hMemDC = CreateCompatibleDC(hDC);
hBitmap = CreateCompatibleBitmap(hDC, 55, 25);
SelectObject(hMemDC, hBitmap);
SetDCBrushColor(hMemDC, RGB(0, 0, 255));
RECT r = { 0 };
r.left = 0;
r.right = 55;
r.top = 0;
r.bottom = 25;
FillRect(hMemDC, &r, (HBRUSH)GetStockObject(DC_BRUSH));
DeleteDC(hMemDC);
ReleaseDC(hWnd, hDC);
SendMessage(hBitmapButton, BM_SETIMAGE, (WPARAM)IMAGE_BITMAP,
(LPARAM)hBitmap);
return 0;
}
case WM_COMMAND:
switch (LOWORD(wParam))
{
case 10001:
MessageBox(hWnd, L"Owner draw button clicked", L"Message", NULL);
return 0;
case 10002:
MessageBox(hWnd, L"Custom draw button clicked", L"Message", NULL);
return 0;
case 10003:
MessageBox(hWnd, L"Bitmap button clicked", L"Message", NULL);
return 0;
}
break;
// Owner draw button
case WM_DRAWITEM:
if (wParam == 10001)
{
if (flag == false)
{
LPDRAWITEMSTRUCT lpDIS = (LPDRAWITEMSTRUCT)lParam;
SetDCBrushColor(lpDIS->hDC, RGB(255, 0, 0));
SelectObject(lpDIS->hDC, GetStockObject(DC_BRUSH));
RoundRect(lpDIS->hDC, lpDIS->rcItem.left, lpDIS->rcItem.top,
lpDIS->rcItem.right, lpDIS->rcItem.bottom, 5, 5);
}
else
{
LPDRAWITEMSTRUCT lpDIS = (LPDRAWITEMSTRUCT)lParam;
SetDCBrushColor(lpDIS->hDC, RGB(0, 255, 0));
SelectObject(lpDIS->hDC, GetStockObject(DC_BRUSH));
RoundRect(lpDIS->hDC, lpDIS->rcItem.left, lpDIS->rcItem.top,
lpDIS->rcItem.right, lpDIS->rcItem.bottom, 5, 5);
}
flag = !flag;
return TRUE;
}
break;
// Custom draw button
case WM_NOTIFY:
switch (((LPNMHDR)lParam)->code)
{
case NM_CUSTOMDRAW:
if (((LPNMHDR)lParam)->idFrom == 10002)
{
LPNMCUSTOMDRAW lpnmCD = (LPNMCUSTOMDRAW)lParam;
switch (lpnmCD->dwDrawStage)
{
case CDDS_PREPAINT:
SetDCBrushColor(lpnmCD->hdc, RGB(0, 255, 0));
SetDCPenColor(lpnmCD->hdc, RGB(0, 255, 0));
SelectObject(lpnmCD->hdc, GetStockObject(DC_BRUSH));
SelectObject(lpnmCD->hdc, GetStockObject(DC_PEN));
RoundRect(lpnmCD->hdc, lpnmCD->rc.left + 3,
lpnmCD->rc.top + 3,
lpnmCD->rc.right - 3,
lpnmCD->rc.bottom - 3, 5, 5);
return TRUE;
}
}
break;
}
break;
case WM_DESTROY:
if (hBitmap != NULL)
DeleteObject((HBITMAP)hBitmap);
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hWnd, msg, wParam, lParam);
}
Try to make some modifications to "if" conditions to meet your needs.