/// <summary>
/// Creates a layout for a document.
/// </summary>
/// <param name="document">The document.</param>
/// <param name="parentControl">The parent control to which embedded objects can
/// attach themselves.</param>
/// <exception cref="ArgumentNullException">Thrown if <paramref name="document"/>
/// or <paramref name="parentControl"/> is null.</exception>
public SplashLayout(SplashDocument document, Control parentControl)
{
if (document == null)
throw new ArgumentNullException("document");
if (parentControl == null)
throw new ArgumentNullException("parentControl");
this.document = document;
this.parentControl = parentControl;
recursionGuard = new RecursionGuard();
scriptMetricsCache = new ScriptMetricsCache();
scriptLineBuffer = new UnmanagedBuffer(InitialCapacityForLinesPerDocument, sizeof(ScriptLine));
tempScriptItemBuffer = new UnmanagedBuffer(InitialCapacityForScriptRunsPerParagraph, sizeof(SCRIPT_ITEM));
tempEmbeddingLevelBuffer = new UnmanagedBuffer(InitialCapacityForScriptRunsPerParagraph, sizeof(byte));
tempVisualToLogicalMapBuffer = new UnmanagedBuffer(InitialCapacityForScriptRunsPerParagraph, sizeof(int));
tempLogicalClustersBuffer = new UnmanagedBuffer(InitialCapacityForCharsPerScriptRun, sizeof(short));
scriptParagraphCache = new ScriptParagraphCache(ScriptParagraphCacheSize);
embeddedObjectHosts = new Dictionary<int, EmbeddedObjectHost>();
pendingEmbeddedObjectHostsToCreate = new Queue<EmbeddedObjectHost>();
pendingEmbeddedObjectHostsToShow = new Queue<EmbeddedObjectHost>();
desiredLayoutWidth = 400; // arbitrary
desiredLayoutRightToLeft = false; // arbitrary
AttachDocumentEvents();
Reset();
}
public ScriptParagraphCache(int size)
{
buffer = new UnmanagedBuffer(size, sizeof(LruEntry));
}
private static void ScriptItemize(char* chars, int charCount, bool rightToLeft,
UnmanagedBuffer tempScriptItemBuffer, out SCRIPT_ITEM* scriptItems, out int scriptItemCount)
{
var scriptControl = new SCRIPT_CONTROL();
var scriptState = new SCRIPT_STATE();
if (rightToLeft)
{
// Start in a RTL context.
scriptState.uBidiLevel = 1;
}
for (; ; )
{
scriptItems = (SCRIPT_ITEM*)tempScriptItemBuffer.GetPointer();
int result = NativeMethods.ScriptItemize(chars, charCount,
tempScriptItemBuffer.Capacity - 1 /*itemize needs 1 extra item beyond capacity as a sentinel*/,
&scriptControl, &scriptState, scriptItems, out scriptItemCount);
if (result == NativeConstants.S_OK)
return;
if (result != NativeConstants.E_OUTOFMEMORY)
Marshal.ThrowExceptionForHR(result);
tempScriptItemBuffer.SetCapacity(tempScriptItemBuffer.Capacity * 2);
}
}
public ScriptParagraphCache(int size)
{
buffer = new UnmanagedBuffer(size, sizeof(LruEntry));
}
