Родительское окно кнопки будет получать уведомление BN_CLICKED
через WM_COMMAND
при нажатии кнопки. Если родительское окно не обрабатывает сообщение, оно заканчивается на DefWindowProc()
и игнорируется. Итак, родительское окно должно обрабатывать WM_COMMAND
. Если код уведомления BN_CLICKED
, просто найдите соответствующую кнопку HWND
в списке кнопок, и, если она найдена, вызовите соответствующую функцию, если она была назначена.
#include <Windows.h>
#include <vector>
#include <thread>
#include <algorithm>
#include <functional>
class WinForm
{
public:
using ControlActionFunc = std::function<void(const std::string &)>;
WinForm(std::string ClassName, std::string WindowName, bool Threaded = false, int Width = CW_USEDEFAULT, int Height = CW_USEDEFAULT);
~WinForm();
bool AddButton(const std::string &ButtonName, POINT Location, int Width, int Height, ControlActionFunc OnClick);
private:
HWND WindowHandle;
std::thread Thread;
using ControlInfo = std::tuple<std::string, std::size_t, HWND, ControlActionFunc>;
using ControlInfoVector = std::vector<ControlInfo>;
ControlInfoVector Controls;
static LRESULT __stdcall StaticWindowProcedure(HWND window, UINT msg, WPARAM wp, LPARAM lp);
protected:
virtual LRESULT WindowProcedure(UINT msg, WPARAM wp, LPARAM lp);
};
class MainAppWinForm : public WInForm
{
public:
using WinForm::WinForm;
protected:
LRESULT WindowProcedure(UINT msg, WPARAM wp, LPARAM lp) override;
};
WinForm::WinForm(std::string ClassName, std::string WindowName, bool Threaded, int Width, int Height)
: WindowHandle(nullptr)
{
HINSTANCE hInstance = GetModuleHandle(nullptr);
WNDCLASSEX WndClass = {};
bool isRegistered = GetClassInfoEx(hInstance, ClassName.c_str(), &WndClass);
if ((!isRegistered) || (WndClass.lpfnWndProc != &WinForm::StaticWindowProcedure))
{
if (isRegistered)
UnregisterClass(ClassName.c_str(), hInstance);
WndClass.cbSize = sizeof(WNDCLASSEX);
WndClass.style = CS_DBLCLKS;
WndClass.lpfnWndProc = &WinForm::StaticWindowProcedure;
WndClass.cbClsExtra = 0;
WndClass.cbWndExtra = sizeof(WinForm*);
WndClass.hInstance = hInstance;
WndClass.hIcon = LoadIcon(nullptr, IDI_APPLICATION);
WndClass.hCursor = LoadCursor(nullptr, IDC_ARROW);
WndClass.hbrBackground = HBRUSH(COLOR_WINDOW + 1);
WndClass.lpszMenuName = nullptr;
WndClass.lpszClassName = ClassName.c_str();
WndClass.hIconSm = LoadIcon(nullptr, IDI_APPLICATION);
if (!RegisterClassEx(&WndClass))
return;
}
if (Threaded)
{
// can't do that!
return;
}
WindowHandle = CreateWindowEx(0, ClassName.c_str(), WindowName.c_str(), WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, Width, Height, nullptr, nullptr, hInstance, this);
if (!WindowHandle)
return;
ShowWindow(WindowHandle, SW_SHOWDEFAULT);
// don't put message loop here!
}
WinForm::~WinForm()
{
if (Thread.joinable())
{
Thread.join();
}
}
LRESULT __stdcall WinForm::StaticWindowProcedure(HWND window, UINT msg, WPARAM wp, LPARAM lp)
{
WinForm *This;
if (msg == WM_NCCREATE)
{
This = static_cast<WinForm*>(reinterpret_cast<CREATESTRUCT*>(lp)->lpCreateParams);
This->WindowHandle = window;
SetWindowLongPtr(window, 0, reinterpret_cast<LONG_PTR>(This));
}
else
This = reinterpret_cast<WinForm*>(GetWindowLongPtr(window, 0));
if (This)
return This->WindowProcedure(msg, wp, lp);
return DefWindowProc(window, msg, wp, lp);
}
LRESULT WinForm::WindowProcedure(UINT msg, WPARAM wp, LPARAM lp)
{
switch (msg)
{
/*
case WM_PAINT:
break;
*/
case WM_COMMAND:
{
if (lp != 0)
{
if (HIWORD(wp) == BN_CLICKED)
{
HWND ControlWindow = reinterpret_cast<HWND>(lp);
auto it = std::find_if(Controls.begin(), Controls.end(),
[](ControlInfo &info){ return (std::get<2>(info) == ControlWindow); }
);
if (it != Controls.end())
{
auto &tu = *it;
auto actionFunc = std::get<3>(tu);
if (actionFunc) actionFunc(std::get<0>(tu));
return 0;
}
}
}
break;
}
case WM_CREATE:
break;
}
return DefWindowProc(WindowHandle, msg, wp, lp);
}
bool WinForm::AddButton(const std::string &ButtonName, POINT Location, int Width, int Height, ControlActionFunc OnClick)
{
auto it = std::find_if(Controls.begin(), Controls.end(),
[&](ControlInfo &info){ return (std::get<0>(info).compare(ButtonName) == 0); }
);
if (it != Controls.end()) {
return false;
}
std::size_t ID = 1;
auto matchesID = [&](ControlInfo &info){ return (std::get<1>(tu) == ID); };
while (std::find_if(Controls.begin(), Controls.end(), matchesID) != Controls.end()) {
++ID;
}
HWND ButtonHandle = CreateWindowEx(
0, "button", ButtonName.c_str(), WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON, Location.x, Location.y, Width, Height,
WindowHandle, (HMENU)ID, (HINSTANCE)GetWindowLong(WindowHandle, GWL_HINSTANCE), nullptr);
if (!ButtonHandle)
return false;
Controls.push_back(std::make_tuple(ButtonName, ID, ButtonHandle, std::move(OnClick)));
return true;
}
LRESULT MainAppWinForm::WindowProcedure(UINT msg, WPARAM wp, LPARAM lp)
{
if (msg == WM_DESTROY)
{
PostQuitMessage(0);
return 0;
}
return WinForm::WindowProcedure(msg, wp, lp);
}
int WINAPI WinMain(HINSTANCE, HINSTANCE, LPSTR, int)
{
MainAppWinForm Form("Class", "Title", false);
POINT pt = { 50, 50 };
Form.AddButton("NewButton", pt, 80, 50,
[](const std::string &ButtonName){ MessageBox(NULL, ButtonName.c_str(), "button clicked", MB_OK); }
);
MSG msg = { nullptr };
while (GetMessage(&msg, nullptr, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return 0;
}
Также см.
Метод класса для WndProc
Win32: более «объектно-ориентированная» оконная система обработки сообщений
Лучший способ хранения этого указателя для использования в WndProc