// Constructor.
internal Screen(Display dpy, int number, IntPtr screen)
{
// Copy parameters in from the create process.
this.dpy = dpy;
this.number = number;
this.screen = screen;
// Create the root window instance for this screen.
rootWindow = new Xsharp.RootWindow
(dpy, this, Xlib.XRootWindowOfScreen(screen));
// Get the default root visual for this screen.
visual = Xlib.XDefaultVisualOfScreen(screen);
// Create a "Colormap" object for the default colormap.
defaultColormap = new Colormap
(dpy, this, Xlib.XDefaultColormapOfScreen(screen));
// Create the GC cache.
defaultGCs = new IntPtr [GCCacheSize];
bitmapGCs = new IntPtr [GCCacheSize];
// Initialize the standard colors.
InitStandardColors();
// Create the placeholder window for parent-less widgets.
placeholder = new PlaceholderWindow(rootWindow);
// Create the grab window for managing popup window events.
grabWindow = new GrabWindow(rootWindow);
}
// Create a new application group for embedding a child application.
private unsafe void CreateApplicationGroup()
{
String displayName;
Xauth *auth;
Xauth *authReturn;
XSecurityAuthorizationAttributes xsa;
Xlib.XSecurityAuthorization xs;
// Check that we can create application groups.
if (!CanEmbed(dpy, true, out displayName))
{
return;
}
try
{
// Lock down the display while we do this.
IntPtr display = dpy.Lock();
// Create the application group identifier.
if (Xlib.XagCreateEmbeddedApplicationGroup
(display, XVisualID.Zero,
Xlib.XDefaultColormapOfScreen(screen.screen),
Xlib.XBlackPixelOfScreen(screen.screen),
Xlib.XWhitePixelOfScreen(screen.screen),
out group) == XStatus.Zero)
{
return;
}
// Generate an authentication token for the group.
auth = Xlib.XSecurityAllocXauth();
if (auth == null)
{
return;
}
auth->name = Marshal.StringToHGlobalAnsi
("MIT-MAGIC-COOKIE-1");
auth->name_length = 18;
xsa = new XSecurityAuthorizationAttributes();
xsa.timeout = 300;
xsa.trust_level = 0; // XSecurityClientTrusted
xsa.group = (XID)group;
xsa.event_mask = 0;
authReturn = Xlib.XSecurityGenerateAuthorization
(display, auth,
(uint)(XSecurityAttributeMask.XSecurityTimeout |
XSecurityAttributeMask.XSecurityTrustLevel |
XSecurityAttributeMask.XSecurityGroup),
ref xsa, out xs);
if (authReturn == null)
{
Xlib.XSecurityFreeXauth(auth);
return;
}
// Write the credentials to a temporary X authority file.
String authFile = Path.GetTempFileName();
FileStream stream = new FileStream
(authFile, FileMode.Create, FileAccess.Write);
WriteShort(stream, 65535); // family = FamilyWild
WriteShort(stream, 0); // address_length
WriteShort(stream, 0); // number_length
WriteShort(stream, authReturn->name_length);
WriteBytes(stream, authReturn->name,
authReturn->name_length);
WriteShort(stream, authReturn->data_length);
WriteBytes(stream, authReturn->data,
authReturn->data_length);
stream.Close();
// Free the Xauth structures that we don't need any more.
Xlib.XSecurityFreeXauth(auth);
Xlib.XSecurityFreeXauth(authReturn);
// Record the app group information.
redirectDisplay = displayName;
authorityFile = authFile;
// Create a wrapper around the appgroup to get events.
groupWrapper = new AppGroupWidget(dpy, screen, group, this);
}
catch (MissingMethodException)
{
return;
}
catch (DllNotFoundException)
{
return;
}
catch (EntryPointNotFoundException)
{
return;
}
finally
{
dpy.Unlock();
}
}
