internal void Navigate(IIsolatedBrowser browser, string url)
{
var task = new NavigationTask()
{
Browser = browser, Url = url
};
if (_current == null)
{
StartTask(task);
}
else if (!_current.Browser.IsBusy)
{
Cleanup();
StartTask(task);
}
else
{
// Check whether we already have a pending navigation for this browser.
// If so, discard it since it's now irrelevant. (It may also be impossible
// if it was for a temporary file: see https://jira.sil.org/browse/BL-863.)
for (int i = 0; i < _pending.Count; ++i)
{
if (browser.Equals(_pending[i].Browser))
{
_pending.RemoveAt(i);
break;
}
}
_pending.Add(task);
}
}
private void StartTask(NavigationTask task)
{
_current = task;
_startNavigation = DateTime.Now;
_current.Browser.InstallEventHandlers();
_current.Browser.Navigated += BrowserOnDocumentCompleted;
Debug.Assert(_timer == null, "We should have cleaned up any old timer before starting a new task");
_timer = new Timer();
_timer.Tick += (sender, args) =>
{
if (_current == null)
{
// We somehow got another tick after the need for the timer has passed. Get rid of it.
CleanupTimer();
return;
}
if (!_current.Browser.IsBusy)
{
// browser stopped being busy without notifying us! Pretend it did.
BrowserOnDocumentCompleted(null, null);
}
if (DateTime.Now - _startNavigation > new TimeSpan(0, 0, 0, 2))
{
// Navigation is taking too long. Sometimes the main window stays busy forerver. Give up.
// Enhance: may want to wait a bit longer if nothing is waiting...but remember idle tasks can still be frozen out.
ForceDocumentCompleted();
}
};
_timer.Interval = 100;
_timer.Start();
_current.Browser.Navigate(_current.Url);
}
private void Cleanup()
{
if (_current == null)
{
return;
}
CleanupTimer();
_current.Browser.RemoveEventHandlers();
_current.Browser.Navigated -= BrowserOnDocumentCompleted;
_current = null;
}
internal void Navigate(IIsolatedBrowser browser, string url)
{
var task = new NavigationTask()
{
Browser = browser, Url = url
};
if (_current == null)
{
StartTask(task);
}
else if (!_current.Browser.IsBusy)
{
Cleanup();
StartTask(task);
}
else
{
_pending.Add(task);
}
}
private void StartTask(NavigationTask task)
{
_current = task;
_startNavigation = DateTime.Now;
_current.Browser.InstallEventHandlers();
_current.Browser.Navigated += BrowserOnDocumentCompleted;
Debug.Assert(_timer == null, "We should have cleaned up any old timer before starting a new task");
_timer = new Timer();
_timer.Tick += (sender, args) =>
{
if (_current == null)
{
// We somehow got another tick after the need for the timer has passed. Get rid of it.
CleanupTimer();
return;
}
if (!_current.Browser.IsBusy)
{
// browser stopped being busy without notifying us! Pretend it did.
BrowserOnDocumentCompleted(null, null);
}
if (DateTime.Now - _startNavigation > new TimeSpan(0, 0, 0, 2))
{
// Navigation is taking too long. Sometimes the main window stays busy forerver. Give up.
// Enhance: may want to wait a bit longer if nothing is waiting...but remember idle tasks can still be frozen out.
ForceDocumentCompleted();
}
};
_timer.Interval = 100;
_timer.Start();
_current.Browser.Navigate(_current.Url);
}
private void Cleanup()
{
if (_current == null) return;
CleanupTimer();
_current.Browser.RemoveEventHandlers();
_current.Browser.Navigated -= BrowserOnDocumentCompleted;
_current = null;
}
internal void Navigate(IIsolatedBrowser browser, string url)
{
var task = new NavigationTask() { Browser = browser, Url = url };
if (_current == null)
{
StartTask(task);
}
else if (!_current.Browser.IsBusy)
{
Cleanup();
StartTask(task);
}
else
{
// Check whether we already have a pending navigation for this browser.
// If so, discard it since it's now irrelevant. (It may also be impossible
// if it was for a temporary file: see https://jira.sil.org/browse/BL-863.)
for (int i = 0; i < _pending.Count; ++i)
{
if (browser.Equals(_pending[i].Browser))
{
_pending.RemoveAt(i);
break;
}
}
_pending.Add(task);
}
}
