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/**************************************************************************
*
* Copyright 2015 VMware, Inc.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
**************************************************************************/
#include "ws_win32.hpp"
#include <assert.h>
#include <process.h>
#include "ws.hpp"
namespace ws {
static LRESULT CALLBACK
WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
MINMAXINFO *pMMI;
switch (uMsg) {
case WM_KEYDOWN:
switch (wParam) {
case VK_ESCAPE:
PostMessage(hWnd, WM_CLOSE, 0, 0);
break;
}
break;
case WM_GETMINMAXINFO:
// Allow to create a window bigger than the desktop
pMMI = (MINMAXINFO *)lParam;
pMMI->ptMaxSize.x = 60000;
pMMI->ptMaxSize.y = 60000;
pMMI->ptMaxTrackSize.x = 60000;
pMMI->ptMaxTrackSize.y = 60000;
break;
case WM_CLOSE:
// This is run on a thread other than the main thread and the retrace
// threads, which are still alive and running, so we must bypass
// destructors here to avoid crashes.
_exit(EXIT_SUCCESS);
break;
default:
break;
}
return DefWindowProc(hWnd, uMsg, wParam, lParam);
}
static const DWORD dwExStyle = 0;
static const DWORD dwStyle = WS_CLIPSIBLINGS | WS_CLIPCHILDREN | WS_OVERLAPPEDWINDOW;
static LPCSTR g_lpszClassName = "retrace";
struct WindowThreadParam
{
LPCSTR lpszWindowName;
int nWidth;
int nHeight;
HANDLE hEvent;
HWND hWnd;
};
static unsigned __stdcall
windowThreadFunction( LPVOID _lpParam )
{
WindowThreadParam *lpParam = (WindowThreadParam *)_lpParam;
// Actually create the window
lpParam->hWnd = CreateWindowExA(dwExStyle,
g_lpszClassName,
lpParam->lpszWindowName,
dwStyle,
0, // x
0, // y
lpParam->nWidth,
lpParam->nHeight,
NULL, // hWndParent
NULL, // hMenu
NULL, // hInstance
NULL); // lpParam
// Notify parent thread that window has been created
SetEvent(lpParam->hEvent);
BOOL bRet;
MSG msg;
while ((bRet = GetMessage(&msg, NULL, 0, 0 )) != FALSE) {
if (bRet == -1) {
// handle the error and possibly exit
} else {
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
// Return the exit code
return msg.wParam;
}
/**
* Create a window on a separate thread.
*
* Each window is associated with one thread, which must process its events,
* and certain operations like SetWindowPos will block until the message is
* process, so the only way to guarantee that the window messages are processed
* timely is by dedicating a thread to processing window events.
*
* TODO: Handle multiple windows on a single thread, instead of creating one
* thread per each window.
*/
HWND
createWindow(LPCSTR lpszWindowName, int nWidth, int nHeight)
{
// Create window class
static bool first = TRUE;
if (first) {
WNDCLASS wc;
ZeroMemory(&wc, sizeof wc);
wc.hbrBackground = (HBRUSH) (COLOR_BTNFACE + 1);
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wc.lpfnWndProc = WndProc;
wc.lpszClassName = g_lpszClassName;
wc.style = CS_OWNDC | CS_HREDRAW | CS_VREDRAW;
RegisterClass(&wc);
first = FALSE;
}
RECT rect;
rect.left = 0;
rect.top = 0;
rect.right = nWidth;
rect.bottom = nHeight;
AdjustWindowRectEx(&rect, dwStyle, FALSE, dwExStyle);
// Spawn window thread
WindowThreadParam param;
param.lpszWindowName = lpszWindowName;
param.nWidth = rect.right - rect.left;
param.nHeight = rect.bottom - rect.top;
param.hEvent = CreateEvent(NULL, FALSE, FALSE, NULL);
_beginthreadex(NULL, 0, &windowThreadFunction, (LPVOID)¶m, 0, NULL);
// Wait for window creation event
WaitForSingleObject(param.hEvent, INFINITE);
CloseHandle(param.hEvent);
RECT rClient;
GetClientRect(param.hWnd, &rClient);
assert(rClient.right - rClient.left >= nWidth);
assert(rClient.bottom - rClient.top >= nHeight);
return param.hWnd;
}
void
showWindow(HWND hWnd)
{
if (!headless) {
ShowWindow(hWnd, SW_SHOW);
}
}
void
resizeWindow(HWND hWnd, int width, int height)
{
RECT rClient;
GetClientRect(hWnd, &rClient);
if (width == rClient.right - rClient.left &&
height == rClient.bottom - rClient.top) {
return;
}
RECT rWindow;
GetWindowRect(hWnd, &rWindow);
width += (rWindow.right - rWindow.left) - rClient.right;
height += (rWindow.bottom - rWindow.top) - rClient.bottom;
UINT uFlags = SWP_NOMOVE
| SWP_NOZORDER
| SWP_NOACTIVATE
| SWP_NOOWNERZORDER;
SetWindowPos(hWnd, NULL, rWindow.left, rWindow.top, width, height, uFlags);
}
bool
processEvents(void)
{
MSG uMsg;
while (PeekMessage(&uMsg, NULL, 0, 0, PM_REMOVE)) {
if (uMsg.message == WM_QUIT) {
return false;
}
if (!TranslateAccelerator(uMsg.hwnd, NULL, &uMsg)) {
TranslateMessage(&uMsg);
DispatchMessage(&uMsg);
}
}
return true;
}
} // namespace ws
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