// This event handler deals with Frambebuffer Updates coming from the host. An
// EncodedRectangle object is passed via the VncEventArgs (actually an IDesktopUpdater
// object so that *only* Draw() can be called here--Decode() is done elsewhere).
// The VncClient object handles thread marshalling onto the UI thread.
protected void VncUpdate(object sender, VncEventArgs e)
{
Dispatcher.Invoke(new Action(() => {
e.DesktopUpdater.Draw(desktop);
}));
if (state == RuntimeState.Connected)
{
vnc.RequestScreenUpdate(fullScreenRefresh);
// Make sure the next screen update is incremental
fullScreenRefresh = false;
}
}
/// <summary>
/// Worker thread lives here and processes protocol messages infinitely, triggering events or other actions as necessary.
/// </summary>
private void GetRfbUpdates()
{
int rectangles;
int enc;
// Get the initial destkop from the host
RequestScreenUpdate(true);
while (true)
{
if (CheckIfThreadDone())
{
break;
}
try {
switch (rfb.ReadServerMessageType())
{
case RfbProtocol.FRAMEBUFFER_UPDATE:
rectangles = rfb.ReadFramebufferUpdate();
if (CheckIfThreadDone())
{
break;
}
// TODO: consider gathering all update rectangles in a batch and *then* posting the event back to the main thread.
for (int i = 0; i < rectangles; ++i)
{
// Get the update rectangle's info
Rectangle rectangle;
rfb.ReadFramebufferUpdateRectHeader(out rectangle, out enc);
// Build a derived EncodedRectangle type and pull-down all the pixel info
EncodedRectangle er = factory.Build(rectangle, enc);
er.Decode();
// Let the UI know that an updated rectangle is available, but check
// to see if the user closed things down first.
if (!CheckIfThreadDone() && VncUpdate != null)
{
VncEventArgs e = new VncEventArgs(er);
// In order to play nicely with WinForms controls, we do a check here to
// see if it is necessary to synchronize this event with the UI thread.
if (VncUpdate.Target is System.Windows.Forms.Control)
{
Control target = VncUpdate.Target as Control;
if (target != null)
{
target.Invoke(VncUpdate, new object[] { this, e });
}
}
else
{
// Target is not a WinForms control, so do it on this thread...
VncUpdate(this, new VncEventArgs(er));
}
}
}
break;
case RfbProtocol.BELL:
Beep(500, 300); // TODO: are there better values than these?
break;
case RfbProtocol.SERVER_CUT_TEXT:
if (CheckIfThreadDone())
{
break;
}
// TODO: This is invasive, should there be a bool property allowing this message to be ignored?
Clipboard.SetDataObject(rfb.ReadServerCutText().Replace("\n", Environment.NewLine), true);
OnServerCutText();
break;
case RfbProtocol.SET_COLOUR_MAP_ENTRIES:
rfb.ReadColourMapEntry();
break;
}
} catch {
OnConnectionLost();
}
}
}
// This event handler deals with Frambebuffer Updates coming from the host. An
// EncodedRectangle object is passed via the VncEventArgs (actually an IDesktopUpdater
// object so that *only* Draw() can be called here--Decode() is done elsewhere).
// The VncClient object handles thread marshalling onto the UI thread.
protected void VncUpdate(object sender, VncEventArgs e)
{
Dispatcher.Invoke(new Action(() => {
e.DesktopUpdater.Draw(desktop);
}));
if (state == RuntimeState.Connected) {
vnc.RequestScreenUpdate(fullScreenRefresh);
// Make sure the next screen update is incremental
fullScreenRefresh = false;
}
}
/// <summary>
/// Worker thread lives here and processes protocol messages infinitely, triggering events or other actions as necessary.
/// </summary>
private void GetRfbUpdates()
{
int rectangles;
int enc;
// Get the initial destkop from the host
RequestScreenUpdate(true);
while (true) {
if (CheckIfThreadDone())
break;
try {
switch (rfb.ReadServerMessageType()) {
case RfbProtocol.FRAMEBUFFER_UPDATE:
rectangles = rfb.ReadFramebufferUpdate();
if (CheckIfThreadDone())
break;
// TODO: consider gathering all update rectangles in a batch and *then* posting the event back to the main thread.
for (int i = 0; i < rectangles; ++i) {
// Get the update rectangle's info
Rectangle rectangle;
rfb.ReadFramebufferUpdateRectHeader(out rectangle, out enc);
// Build a derived EncodedRectangle type and pull-down all the pixel info
EncodedRectangle er = factory.Build(rectangle, enc);
er.Decode();
// Let the UI know that an updated rectangle is available, but check
// to see if the user closed things down first.
if (!CheckIfThreadDone() && VncUpdate != null) {
VncEventArgs e = new VncEventArgs(er);
// In order to play nicely with WinForms controls, we do a check here to
// see if it is necessary to synchronize this event with the UI thread.
if (VncUpdate.Target is System.Windows.Forms.Control) {
Control target = VncUpdate.Target as Control;
if (target != null)
target.Invoke(VncUpdate, new object[] { this, e });
} else {
// Target is not a WinForms control, so do it on this thread...
VncUpdate(this, new VncEventArgs(er));
}
}
}
break;
case RfbProtocol.BELL:
Beep(500, 300); // TODO: are there better values than these?
break;
case RfbProtocol.SERVER_CUT_TEXT:
if (CheckIfThreadDone())
break;
// TODO: This is invasive, should there be a bool property allowing this message to be ignored?
Clipboard.SetDataObject(rfb.ReadServerCutText().Replace("\n", Environment.NewLine), true);
OnServerCutText();
break;
case RfbProtocol.SET_COLOUR_MAP_ENTRIES:
rfb.ReadColourMapEntry();
break;
}
} catch {
OnConnectionLost();
}
}
}
