SharedTimerWin.cpp [plain text]
#include "config.h"
#include "SharedTimer.h"
#include "SystemTime.h"
#include "Widget.h"
#include <wtf/Assertions.h>
#include <windows.h>
namespace WebCore {
static UINT timerID;
static void (*sharedTimerFiredFunction)();
static HWND timerWindowHandle = 0;
static UINT timerFiredMessage = 0;
const LPCWSTR kTimerWindowClassName = L"TimerWindowClass";
LRESULT CALLBACK TimerWindowWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
if (message == timerFiredMessage)
sharedTimerFiredFunction();
else
return DefWindowProc(hWnd, message, wParam, lParam);
return 0;
}
static void initializeOffScreenTimerWindow()
{
if (timerWindowHandle)
return;
WNDCLASSEX wcex;
memset(&wcex, 0, sizeof(WNDCLASSEX));
wcex.cbSize = sizeof(WNDCLASSEX);
wcex.lpfnWndProc = TimerWindowWndProc;
wcex.hInstance = Widget::instanceHandle;
wcex.lpszClassName = kTimerWindowClassName;
RegisterClassEx(&wcex);
timerWindowHandle = CreateWindow(kTimerWindowClassName, 0, 0,
CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, HWND_MESSAGE, 0, Widget::instanceHandle, 0);
timerFiredMessage = RegisterWindowMessage(L"com.apple.WebKit.TimerFired");
}
void setSharedTimerFiredFunction(void (*f)())
{
sharedTimerFiredFunction = f;
}
static void CALLBACK timerFired(HWND, UINT, UINT_PTR, DWORD)
{
sharedTimerFiredFunction();
}
void setSharedTimerFireTime(double fireTime)
{
ASSERT(sharedTimerFiredFunction);
double interval = fireTime - currentTime();
unsigned intervalInMS;
if (interval < 0)
intervalInMS = 0;
else {
interval *= 1000;
if (interval > USER_TIMER_MAXIMUM)
intervalInMS = USER_TIMER_MAXIMUM;
else
intervalInMS = (unsigned)interval;
}
if (timerID)
KillTimer(0, timerID);
if (intervalInMS == 0) {
timerID = 0;
initializeOffScreenTimerWindow();
PostMessage(timerWindowHandle, timerFiredMessage, 0, 0);
} else
timerID = SetTimer(0, 0, intervalInMS, timerFired);
}
void stopSharedTimer()
{
if (timerID) {
KillTimer(0, timerID);
timerID = 0;
}
}
}