/// <summary>
/// This is the real guts of type-ahead. It is called by the client whenever a key is pressed.
/// It returns true if it handled the key press, which it does if the current selection
/// is in a type-ahead name property.
/// </summary>
/// <param name="ehelp"></param>
/// <param name="e"></param>
/// <param name="modifiers"></param>
/// <param name="vwGraphics"></param>
/// <returns></returns>
public virtual bool OnKeyPress(EditingHelper ehelp, KeyPressEventArgs e, Keys modifiers, IVwGraphics vwGraphics)
{
IVwRootBox rootb = ehelp.Callbacks.EditedRootBox;
if (rootb == null) // If we don't have a root box, can't do anything interesting.
{
return(false);
}
IVwSelection sel = rootb.Selection;
if (sel == null) // nothing interesting to do without a selection, either.
{
return(false);
}
ITsString tssA, tssE;
int ichA, ichE, hvoObjA, hvoObjE, tagA, tagE, ws;
bool fAssocPrev;
// Enhance JohnT: what we're really trying to do here is confirm that the selection is
// all in one string property. We could readily have a method in the selection interface to tell us that.
sel.TextSelInfo(false, out tssA, out ichA, out fAssocPrev, out hvoObjA, out tagA, out ws);
if (tagA != m_taTagName)
{
return(false); // selection not anchored in a type-ahead name property.
}
sel.TextSelInfo(true, out tssE, out ichE, out fAssocPrev, out hvoObjE, out tagE, out ws);
int cch = tssA.Length;
// To do our type-ahead trick, both ends of the seleciton must be in the same string property.
// Also, we want the selection to extend to the end of the name.
// Enhance JohnT: poupu list may not depend on selection extending to end.
if (tagE != m_taTagName || hvoObjE != hvoObjA || cch != tssE.Length || Math.Max(ichA, ichE) != cch)
{
return(false); // not going to attempt type-ahead behavior
}
// if the key pressed is a backspace or del, prevent smart completion,
// otherwise we are likely to put back what the user deleted.
// Review JohnT: do arrow keys come through here? What do we do if so?
int charT = Convert.ToInt32(e.KeyChar);
if (charT == (int)Keys.Back || charT == (int)Keys.Delete)
{
return(false); // normal key handling will just delete selection. // Review: should backspace delete one more?
}
// OK, we're in a type-ahead situation. First step is to let normal editing take place.
ehelp.OnKeyPress(e, modifiers);
e.Handled = true;
// Now see what we have. Note that our old selection is no longer valid.
sel = rootb.Selection;
if (sel == null)
{
return(true); // can't be smart, but we already did the keypress.
}
int cvsli = sel.CLevels(false);
// CLevels includes the string prop itself, but AllTextSelInfo does not need it.
cvsli--;
// Get selection information to determine where the user is typing.
int ihvoObj;
int tagTextProp;
int cpropPrevious, ichAnchor, ichEnd, ihvoEnd;
ITsTextProps ttp;
SelLevInfo[] rgvsli = SelLevInfo.AllTextSelInfo(sel, cvsli,
out ihvoObj, out tagTextProp, out cpropPrevious, out ichAnchor, out ichEnd,
out ws, out fAssocPrev, out ihvoEnd, out ttp);
if (tagTextProp != m_taTagName || ichAnchor != ichEnd || ihvoEnd != -1 || cvsli < 1)
{
return(true); // something bizarre happened, but keypress is done.
}
int hvoLeaf = rgvsli[0].hvo;
// Get the parent object we will modify.
// (This would usually work, but not if the parent object is the root of the whole display,
// as in a simple atomic ref type ahead slice.
//int hvoParent = rgvsli[1].hvo; // object whose reference property we are setting.)
int tagParent, cpropPreviousDummy, ihvo;
IVwPropertyStore vps;
int hvoParent;
sel.PropInfo(false, 1, out hvoParent, out tagParent, out ihvo, out cpropPreviousDummy, out vps);
if (hvoParent != m_hvoParent)
{
return(true); // another bizarre unexpected event.
}
// This is what the name looks like after the keypress.
ITsString tssTyped = m_sda.get_StringProp(hvoLeaf, m_taTagName);
// Get the substitute. This is where the actual type-ahead behavior happens. Sets hvoNewRef to 0 if no match.
ICmObject objNewRef;
ITsString tssLookup = Lookup(tssTyped, out objNewRef);
int hvoNewRef = (objNewRef != null) ? objNewRef.Hvo : 0;
IVwCacheDa cda = m_sda as IVwCacheDa;
if (hvoNewRef == 0 && tssTyped.Length > 0)
{
// No match...underline string in red squiggle.
ITsStrBldr bldr = tssLookup.GetBldr();
bldr.SetIntPropValues(0, tssLookup.Length, (int)FwTextPropType.ktptUnderline,
(int)FwTextPropVar.ktpvEnum, (int)FwUnderlineType.kuntSquiggle);
bldr.SetIntPropValues(0, tssLookup.Length, (int)FwTextPropType.ktptUnderColor,
(int)FwTextPropVar.ktpvDefault, (int)ColorUtil.ConvertColorToBGR(Color.Red));
tssLookup = bldr.GetString();
}
// Don't rely on sel from here on.
if (hvoNewRef != hvoLeaf)
{
m_hvoTa = hvoNewRef; // Before we replace in the prop, so it gets displayed using special ta prop.
switch (m_type)
{
case CellarPropertyType.ReferenceAtomic:
if (m_hvoParent != 0) // I think it always is, except when loss of focus during debugging causes problems.
{
// If nothing matched, set the real property to null and the fake one to kbaseFakeObj.
// Otherwise set both to the indicated object.
m_sda.SetObjProp(m_hvoParent, m_tag, hvoNewRef); // Review: do we want to set the real thing yet?
m_sda.PropChanged(null, (int)PropChangeType.kpctNotifyAll, m_hvoParent, m_tag, 0, 1, 1);
if (hvoNewRef == 0)
{
hvoNewRef = m_hvoTa = kBaseFakeObj; // use in fake so we can display something.
}
cda.CacheObjProp(m_hvoParent, m_virtualTagObj, hvoNewRef); // Change the fake property
m_sda.PropChanged(null, (int)PropChangeType.kpctNotifyAll, m_hvoParent, m_virtualTagObj, 0, 1, 1);
}
break;
case CellarPropertyType.ReferenceSequence:
case CellarPropertyType.ReferenceCollection:
// Several cases, depending on whether we got a match and whether hvoLeaf is the dummy object
// 1. match on dummy: insert appropriate real object, change dummy name to empty.
// 2. match on non-dummy: replace old object with new
// 3: non-match: do nothing. (Even if not looking at the fake object, we'll go on using the
// actual object as a base for the fake name, since it's displayed only for the active position.)
if (hvoNewRef == 0)
{
break; // case 3
}
if (hvoLeaf == kBaseFakeObj)
{ // case 1
// The fake object goes back to being an empty name at the end of the list.
ITsStrBldr bldr = tssLookup.GetBldr();
bldr.ReplaceTsString(0, bldr.Length, null); // makes an empty string in correct ws.
cda.CacheStringProp(kBaseFakeObj, m_taTagName, bldr.GetString());
// Insert the new object before the fake one in fake prop and at end of real seq.
// Include the fake object in the replace to get it redisplayed also.
cda.CacheReplace(m_hvoParent, m_virtualTagObj, m_ihvoTa, m_ihvoTa + 1, new int[] { hvoNewRef, kBaseFakeObj }, 2);
m_sda.PropChanged(null, (int)PropChangeType.kpctNotifyAll, m_hvoParent, m_virtualTagObj, m_ihvoTa, 2, 1);
m_sda.Replace(m_hvoParent, m_tag, m_ihvoTa, m_ihvoTa, new int[] { hvoNewRef }, 1);
m_sda.PropChanged(null, (int)PropChangeType.kpctNotifyAll, m_hvoParent, m_tag, m_ihvoTa, 1, 0);
}
else
{ // case 2
// Replace the object being edited with the indicated one in both props.
cda.CacheReplace(m_hvoParent, m_virtualTagObj, m_ihvoTa, m_ihvoTa + 1, new int[] { hvoNewRef }, 1);
m_sda.PropChanged(null, (int)PropChangeType.kpctNotifyAll, m_hvoParent, m_virtualTagObj, m_ihvoTa, 1, 1);
m_sda.Replace(m_hvoParent, m_tag, m_ihvoTa, m_ihvoTa + 1, new int[] { hvoNewRef }, 1);
m_sda.PropChanged(null, (int)PropChangeType.kpctNotifyAll, m_hvoParent, m_tag, m_ihvoTa, 1, 1);
}
break;
default:
throw new Exception("unsupported property type for type-ahead chooser");
}
}
cda.CacheStringProp(hvoNewRef, m_taTagName, tssLookup);
m_sda.PropChanged(null, (int)PropChangeType.kpctNotifyAll, hvoNewRef, m_taTagName, 0, tssLookup.Length, tssTyped.Length);
// Make a new selection, typically the range that is the bit added to the typed string.
// no change is needed to rgvsli because it's the same object index in the same property of the same parent.
sel = rootb.MakeTextSelection(ihvoObj, cvsli, rgvsli, m_taTagName, cpropPrevious, ichAnchor,
tssLookup.Length, ws, true, -1, null, true);
return(true);
}
