SFML community forums
Help => Window => Topic started by: degski on December 23, 2019, 05:08:36 pm
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Hi Everyone,
I would like to create (on Windows 10) a window with an extended style (WS_EX_TOOLWINDOW, which does not create a taskbar icon when active, that's the objective). There is a "com-"way, but that seems complicated.
This code (in the constructor of my app-class) does the "non-extended" style creation (my starting-point):
m_context_settings.antialiasingLevel = 8u;
m_render_window.create ( sf::VideoMode ( 1200u, 150u ), L"yawa", sf::Style::None, m_context_settings );
This works (obviously) perfectly fine.
I worked out the extended style should be something like:
m_context_settings.antialiasingLevel = 8u;
sf::WindowHandle handle = CreateWindowEx ( WS_EX_TOOLWINDOW, TEXT ( "YAWA_CLASS" ), TEXT ( "yawa" ), WS_POPUP, 0, 0, 1200u, 150u,
NULL, NULL, GetModuleHandle ( NULL ), NULL );
m_render_window.create ( handle, m_context_settings );
But this does not work, so I'm missing something (or I am mis-understanding things). Could someone please help me understand what to do?
EDIT1: I have now created a function (using Win32) to (properly this time, I hope) create an extended window and return a handle to it:
//
//
// WndProc - Window procedure (dummy)
//
//
LRESULT
CALLBACK
WndProc1 ( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam ) {
switch ( uMsg ) {
case WM_DESTROY: ::PostQuitMessage ( 0 ); break;
default: return ::DefWindowProc ( hWnd, uMsg, wParam, lParam );
}
return 0;
}
HWND make_extended_window ( sf::VideoMode const & vm_ ) {
HINSTANCE hInstance = ( HINSTANCE ) GetModuleHandle ( NULL );
WNDCLASSEX wcex{ };
wcex.cbSize = sizeof ( wcex ); // WNDCLASSEX size in bytes
wcex.style = CS_HREDRAW | CS_VREDRAW; // Window class styles
wcex.lpszClassName = TEXT ( "YAWAWINDOWCLASS" ); // Window class name
wcex.hbrBackground = ( HBRUSH ) ( COLOR_WINDOW + 1 ); // Window background brush color.
wcex.hCursor = LoadCursor ( hInstance, IDC_ARROW ); // Window cursor
wcex.lpfnWndProc = WndProc1; // Window procedure associated to this window class.
wcex.hInstance = hInstance; // The application instance.
// Register window and ensure registration success.
if ( !RegisterClassEx ( &wcex ) )
return nullptr;
// Setup window initialization attributes.
CREATESTRUCT cs{ };
cs.cx = vm_.width; // Window width
cs.cy = vm_.height; // Window height
cs.hInstance = hInstance; // Window instance.
cs.lpszClass = wcex.lpszClassName; // Window class name
cs.lpszName = TEXT ( "yawa" ); // Window title
cs.style = WS_VISIBLE | WS_POPUP; // Window style (sf::Style::None)
cs.dwExStyle = WS_EX_TOOLWINDOW; // Extended window style, no taskbar icon.
// Create the window.
return ::CreateWindowEx ( cs.dwExStyle, cs.lpszClass, cs.lpszName, cs.style, cs.x, cs.y, cs.cx, cs.cy, cs.hwndParent, cs.hMenu,
cs.hInstance, cs.lpCreateParams );
}
and then at the call-site (the constructor):
m_context_settings.antialiasingLevel = 8u;
m_render_window.create ( make_extended_window ( sf::VideoMode ( 1200u, 150u ) ), m_context_settings );
This works sort of. To start with, the window icon is not present on the taskbar (mission achieved). I can write and display something in the window, so many things are good! But if I hover over the window, the cursor starts spinning (not with an ordinary window) and when I click the window, the app crashes. So something is still wrong.
When I look at the relevant constructorhttps://github.com/SFML/SFML/blob/80c3bdc23c1874494196bbf8a481a859712ece88/src/SFML/Window/Win32/WindowImplWin32.cpp#L132 (https://github.com/SFML/SFML/blob/80c3bdc23c1874494196bbf8a481a859712ece88/src/SFML/Window/Win32/WindowImplWin32.cpp#L132) , the right things seem to be happening, this-ptr is plugged in (cs.lpCreateParams) and the WndProc ptr is remapped, still something is wrong.
With this additional info, is there someone who sees the missing bit? Thanks in advance!
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Wouldn't it be simpler to let SFML create the window, and then change its style with some Win32 function (SetWindowLongPtr with GWL_EXSTYLE, probably)? Remmeber that you can get the native sf::Window handle with window.getHandle().