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borderless-window.cpp
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borderless-window.cpp
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/* borderless-window - a minimal borderless window with the Windows API
*
* Written in 2016 by James Ross-Gowan, modified in 2018 by Andreas Mantler
*
* To the extent possible under law, the author(s) have dedicated all copyright
* and related and neighboring rights to this software to the public domain
* worldwide. This software is distributed without any warranty.
*
* See <https://creativecommons.org/publicdomain/zero/1.0/> for a copy of the
* CC0 Public Domain Dedication, which applies to this software.
*/
#define WIN32_LEAN_AND_MEAN
#define VC_EXTRALEAN
#include <windows.h>
#include <windowsx.h>
#include <dwmapi.h>
#include <malloc.h>
#include "borderless-window.h"
#pragma comment(lib, "user32.lib")
#pragma comment(lib, "gdi32.lib")
#pragma comment(lib, "dwmapi.lib")
static BOOL GetClientRectInScreenSpace(borderless_window_t *window, LPRECT rect)
{
RECT clientArea;
if (!GetClientRect(window->hwnd, &clientArea))
return FALSE;
POINT tlClientArea = { clientArea.left, clientArea.top };
if (!ClientToScreen(window->hwnd, &tlClientArea))
return FALSE;
rect->left = tlClientArea.x;
rect->top = tlClientArea.y;
rect->right = tlClientArea.x + clientArea.right;
rect->bottom = tlClientArea.y + clientArea.bottom;
return TRUE;
}
static BOOL IsLeftSnapped(LPRECT clientRect, LPRECT monitorRect)
{
s32 monitorWHalf = (monitorRect->right - monitorRect->left) >> 1;
s32 clientW = clientRect->right - clientRect->left;
if (clientRect->top == monitorRect->top && clientRect->left == monitorRect->left && clientRect->bottom == monitorRect->bottom && monitorWHalf == clientW)
return TRUE;
else
return FALSE;
}
static BOOL IsRightSnapped(LPRECT clientRect, LPRECT monitorRect)
{
s32 monitorWHalf = (monitorRect->right - monitorRect->left) >> 1;
s32 clientW = clientRect->right - clientRect->left;
if (clientRect->top == monitorRect->top && clientRect->left == (monitorRect->left + monitorWHalf) && clientRect->bottom == monitorRect->bottom && monitorWHalf == clientW)
return TRUE;
else
return FALSE;
}
static HMONITOR GetNextMonitorRight(LPRECT monitorRect)
{
POINT pt = { monitorRect->right + 1, (monitorRect->bottom - monitorRect->top) >> 1 };
HMONITOR nextMonitor = MonitorFromPoint(pt, MONITOR_DEFAULTTONULL);
if (nextMonitor)
return nextMonitor;
pt.x = -MAXLONG;
nextMonitor = MonitorFromPoint(pt, MONITOR_DEFAULTTONEAREST);
return nextMonitor;
}
static HMONITOR GetNextMonitorLeft(LPRECT monitorRect)
{
POINT pt = { monitorRect->left - 1, (monitorRect->bottom - monitorRect->top) >> 1 };
HMONITOR nextMonitor = MonitorFromPoint(pt, MONITOR_DEFAULTTONULL);
if (nextMonitor)
return nextMonitor;
pt.x = MAXLONG;
nextMonitor = MonitorFromPoint(pt, MONITOR_DEFAULTTONEAREST);
return nextMonitor;
}
static void handle_snap_left(borderless_window_t *window, LPRECT clientRect, LPRECT monitorWork, LPRECT monitor)
{
if (window->maximized)
ShowWindow(window->hwnd, SW_RESTORE);
s32 w = monitorWork->right - monitorWork->left;
s32 h = monitorWork->bottom - monitorWork->top;
if (IsLeftSnapped(clientRect, monitorWork))
{
//Note:[NoMoreSleep] Already snapped, select next monitor to snap to
HMONITOR nextMonitor = GetNextMonitorLeft(monitor);
MONITORINFO monitorInfo = {};
monitorInfo.cbSize = sizeof(monitorInfo);
GetMonitorInfoW(nextMonitor, &monitorInfo);
RECT &r = monitorInfo.rcWork;
w = r.right - r.left;
h = r.bottom - r.top;
SetWindowPos(window->hwnd, HWND_TOP, r.left + w / 2, r.top, w / 2, h, NULL);
}
else if (IsRightSnapped(clientRect, monitorWork))
{
RECT &r = window->tile_restore_rect;
SetWindowPos(window->hwnd, HWND_TOP, r.left, r.top, r.right - r.left, r.bottom - r.top, NULL);
}
else
{
SetWindowPos(window->hwnd, HWND_TOP, monitorWork->left, monitorWork->top, w / 2, h, NULL);
window->tile_restore_rect = *clientRect;
}
}
static void handle_snap_right(borderless_window_t *window, LPRECT clientRect, LPRECT monitorWork, LPRECT monitor)
{
if(window->maximized)
ShowWindow(window->hwnd, SW_RESTORE);
s32 w = monitorWork->right - monitorWork->left;
s32 h = monitorWork->bottom - monitorWork->top;
if (IsRightSnapped(clientRect, monitorWork))
{
//Note:[NoMoreSleep] Already snapped, select next monitor to snap to
HMONITOR nextMonitor = GetNextMonitorRight(monitor);
MONITORINFO monitorInfo = {};
monitorInfo.cbSize = sizeof(monitorInfo);
GetMonitorInfoW(nextMonitor, &monitorInfo);
RECT &r = monitorInfo.rcWork;
w = r.right - r.left;
h = r.bottom - r.top;
SetWindowPos(window->hwnd, HWND_TOP, r.left, r.top, w / 2, h, NULL);
}
else if (IsLeftSnapped(clientRect, monitorWork))
{
RECT &r = window->tile_restore_rect;
SetWindowPos(window->hwnd, HWND_TOP, r.left, r.top, r.right - r.left, r.bottom - r.top, NULL);
}
else
{
SetWindowPos(window->hwnd, HWND_TOP, monitorWork->left + w / 2, monitorWork->top, w / 2, h, NULL);
window->tile_restore_rect = *clientRect;
}
}
static void handle_compositionchanged(borderless_window_t *window)
{
BOOL enabled = FALSE;
#if 0
DwmIsCompositionEnabled(&enabled);
window->composition_enabled = enabled == TRUE;
if (enabled)
{
MARGINS m = {0};
m.cyTopHeight = 1;
DwmExtendFrameIntoClientArea(window->hwnd, &m);
DWORD state = DWMNCRP_ENABLED;
DwmSetWindowAttribute(window->hwnd, DWMWA_NCRENDERING_POLICY, &state, sizeof(DWORD));
}
#endif
}
static LRESULT handle_nchittest(borderless_window_t *window, s32 x, s32 y)
{
if (IsMaximized(window->hwnd))
return HTCLIENT;
POINT mouse = { x, y };
ScreenToClient(window->hwnd, &mouse);
/* The horizontal frame should be the same size as the vertical frame,
since the NONCLIENTMETRICS structure does not distinguish between them */
s32 frame_size = GetSystemMetrics(SM_CXFRAME); // + GetSystemMetrics(SM_CXPADDEDBORDER);
/* The diagonal size handles are wider than the frame */
s32 diagonal_width = frame_size * 2 + GetSystemMetrics(SM_CXBORDER);
if (mouse.y < frame_size)
{
if (mouse.x < diagonal_width)
return HTTOPLEFT;
if (mouse.x >= (s32)window->width - diagonal_width)
return HTTOPRIGHT;
return HTTOP;
}
if (mouse.y >= (s32)window->height - frame_size)
{
if (mouse.x < diagonal_width)
return HTBOTTOMLEFT;
if (mouse.x >= (s32)window->width - (s32)diagonal_width)
return HTBOTTOMRIGHT;
return HTBOTTOM;
}
if (mouse.x < frame_size)
return HTLEFT;
if (mouse.x >= (s32)window->width - frame_size)
return HTRIGHT;
return HTCLIENT;
}
static LRESULT CALLBACK borderless_window_proc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam)
{
borderless_window_t *window = (borderless_window_t*)GetWindowLongPtrW(hwnd, GWLP_USERDATA);
if (!window)
{
if (msg == WM_NCCREATE)
{
CREATESTRUCTW *createStruct = (CREATESTRUCTW*)lparam;
window = (borderless_window_t*)createStruct->lpCreateParams;
window->hwnd = hwnd;
window->hdc = GetDC(hwnd);
window->width = createStruct->cx;
window->height = createStruct->cy;
SetWindowLongPtrW(hwnd, GWLP_USERDATA, (LONG_PTR)window);
}
return DefWindowProcW(hwnd, msg, wparam, lparam);
}
switch (msg)
{
case WM_DWMCOMPOSITIONCHANGED:
handle_compositionchanged(window);
return 0;
case WM_NCHITTEST:
return handle_nchittest(window, GET_X_LPARAM(lparam), GET_Y_LPARAM(lparam));
case WM_PAINT:
if (window->painting) // Prevent recursive painting
return DefWindowProcW(hwnd, msg, wparam, lparam);
window->painting = true;
break;
case WM_SIZE:
window->minimized = wparam == SIZE_MINIMIZED;
window->maximized = wparam == SIZE_MAXIMIZED;
if (window->maximized && (window->width != LOWORD(lparam) || window->height != HIWORD(lparam)))
{
const POINT zero = { 0, 0 };
HMONITOR monitor = MonitorFromWindow(hwnd, MONITOR_DEFAULTTONEAREST);
MONITORINFO monitorInfo = {};
monitorInfo.cbSize = sizeof(monitorInfo);
if (GetMonitorInfoW(monitor, &monitorInfo))
{
RECT &r = monitorInfo.rcWork;
window->width = r.right - r.left;
window->height = r.bottom - r.top;
SetWindowPos(hwnd, HWND_TOP, r.left, r.top, window->width, window->height, NULL);
return 0;
}
}
window->width = LOWORD(lparam);
window->height = HIWORD(lparam);
return 0;
case WM_KEYUP:
if (((GetKeyState(VK_LWIN) & 0x8000) != 0 ||
(GetKeyState(VK_RWIN) & 0x8000) != 0) &&
(wparam == VK_LEFT ||
wparam == VK_RIGHT ||
wparam == VK_DOWN ||
wparam == VK_UP))
{
HMONITOR windowMonitor = MonitorFromWindow(window->hwnd, MONITOR_DEFAULTTONEAREST);
MONITORINFO monitorInfo = {};
monitorInfo.cbSize = sizeof(monitorInfo);
if (!GetMonitorInfoW(windowMonitor, &monitorInfo))
break;
RECT clientRect;
if (!GetClientRectInScreenSpace(window, &clientRect))
break;
if (wparam == VK_LEFT)
{
handle_snap_left(window, &clientRect, &monitorInfo.rcWork, &monitorInfo.rcMonitor);
}
else if (wparam == VK_RIGHT)
{
handle_snap_right(window, &clientRect, &monitorInfo.rcWork, &monitorInfo.rcMonitor);
}
else if (wparam == VK_DOWN)
{
if (IsLeftSnapped(&clientRect, &monitorInfo.rcWork) || IsRightSnapped(&clientRect, &monitorInfo.rcWork))
{
RECT &r = window->tile_restore_rect;
SetWindowPos(window->hwnd, HWND_TOP, r.left, r.top, r.right - r.left, r.bottom - r.top, NULL);
}
else
ShowWindow(hwnd, SW_RESTORE);
}
else if (wparam == VK_UP)
{
ShowWindow(hwnd, SW_MAXIMIZE);
}
}
break;
}
LRESULT result = window->handler(window, msg, wparam, lparam) ? 0 : DefWindowProcW(hwnd, msg, wparam, lparam);
if (msg == WM_PAINT)
window->painting = false;
else if (msg == WM_CLOSE || msg == WM_QUIT)
{
DestroyWindow(hwnd);
free(window);
return 0;
}
return result;
}
void borderless_window_register()
{
WNDCLASSEXW wc = {0};
wc.cbSize = sizeof(WNDCLASSEXW);
wc.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC | CS_DBLCLKS;
wc.lpfnWndProc = borderless_window_proc;
wc.hInstance = GetModuleHandle(NULL);
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = NULL;
wc.lpszClassName = L"borderless-window";
RegisterClassExW(&wc);
}
void borderless_window_unregister()
{
UnregisterClassW(L"borderless-window", GetModuleHandle(NULL));
}
borderless_window_t* borderless_window_create(LPCWSTR title, s32 width, s32 height, message_handler handler, void* userdata)
{
borderless_window_t *window = (borderless_window_t*)calloc(1, sizeof(borderless_window_t));
window->handler = handler;
window->userdata = userdata;
CreateWindowExW(
WS_EX_APPWINDOW | WS_EX_LAYERED,
L"borderless-window",
title,
//NOTE:[NoMoreSleep] WS_THICKFRAME is required for "native" aero snap feature
WS_POPUP | WS_MINIMIZEBOX | WS_MAXIMIZEBOX | WS_VISIBLE,
CW_USEDEFAULT, CW_USEDEFAULT, width, height,
NULL, NULL, GetModuleHandle(NULL), window);
// Necessary if you want compositing to work properly with alpha blending:
SetLayeredWindowAttributes(window->hwnd, RGB(255, 0, 255), 255, LWA_COLORKEY);
handle_compositionchanged(window);
return window;
}
static BOOL CALLBACK enum_thread_window(HWND hwnd, LPARAM /*lParam*/)
{
PostMessageW(hwnd, WM_CLOSE, 0, 0);
return TRUE;
}
void borderless_window_close_all(borderless_window_t *root)
{
EnumThreadWindows(GetWindowThreadProcessId(root->hwnd, 0), enum_thread_window, NULL);
}
void borderless_window_close(borderless_window_t *window)
{
PostMessageW(window->hwnd, WM_CLOSE, 0, 0);
}