@Override
protected void defineProperties() throws OmDeveloperException {
super.defineProperties();
defineString(PROPERTY_ALT);
defineBoolean(PROPERTY_TEXTFONT);
setBoolean(PROPERTY_TEXTFONT, false);
}
@Override
public void produceVisibleOutput(QContent qc, boolean bInit, boolean bPlain) throws OmException {
// Get actual current value of string
String sCurrent = getQuestion().applyPlaceholders(sEquation);
if (bPlain) {
// Put text equivalent
Element eDiv =
qc.createElement("div"); // Can't use span because they aren't allowed to contain things
eDiv.setAttribute("style", "display:inline");
qc.addInlineXHTML(eDiv);
XML.createText(eDiv, (bSpaceBefore ? " " : "") + getString("alt") + (bSpaceAfter ? " " : ""));
qc.addTextEquivalent(getString("alt"));
// Put each placeholder
for (int i = 0; i < apPlaces.length; i++) {
// Check content is not hidden
Place p = apPlaces[i];
if ((!p.bImplicit && !p.qc.isDisplayed()) || (p.bImplicit && !p.qc.isChildDisplayed()))
continue;
// Label followed by content of placeholder
Element ePlace = XML.createChild(eDiv, "div");
if (p.sLabel != null) {
Element eLabel = XML.createChild(ePlace, p.sLabelFor == null ? "span" : "label");
XML.createText(eLabel, p.sLabel + " ");
qc.addTextEquivalent(p.sLabel);
if (p.sLabelFor != null)
eLabel.setAttribute(
"for", LabelComponent.getLabel(getQDocument(), bPlain, p.sLabelFor));
}
qc.setParent(ePlace);
p.qc.produceOutput(qc, bInit, bPlain);
qc.unsetParent();
}
} else {
// Check background colour, foreground, and zoom
Color cBackground = getBackground();
if (cBackground == null) cBackground = Color.white;
Color cForeground =
getQuestion().isFixedColour()
? convertRGB(getQuestion().getFixedColourFG())
: Color.black;
double dZoom = getQuestion().getZoom();
// Hash to filename/identifier
String sFilename =
"eq"
+ (sCurrent.hashCode()
+ cBackground.hashCode() * 3
+ cForeground.hashCode() * 7
+ (new Double(dZoom)).hashCode() * 11)
+ (getBoolean(PROPERTY_TEXTFONT) ? "t" : "e")
+ ".png";
// Make actual image if needed, also get placeholder positions
if (!sFilename.equals(sSent)) {
e = Equation.create(sCurrent, (float) dZoom);
if (getBoolean(PROPERTY_TEXTFONT)) e.setFont("Verdana", new int[] {13, 11, 9});
BufferedImage bi = e.render(cForeground, cBackground, true);
qc.addResource(sFilename, "image/png", QContent.convertPNG(bi));
for (int i = 0; i < apPlaces.length; i++) {
Point p = e.getPlaceholder(apPlaces[i].sID);
apPlaces[i].iActualX = p.x;
apPlaces[i].iActualY = p.y;
}
sSent = sFilename;
}
Element eEnsureSpaces = qc.createElement("div");
eEnsureSpaces.setAttribute("class", "equation");
qc.addInlineXHTML(eEnsureSpaces);
// If there's a space before, add one here too (otherwise IE eats it)
if (bSpaceBefore) XML.createText(eEnsureSpaces, " ");
String sImageID = QDocument.ID_PREFIX + getID() + "_img";
Element eImg = XML.createChild(eEnsureSpaces, "img");
eImg.setAttribute("id", sImageID);
eImg.setAttribute("onmousedown", "return false;"); // Prevent Firefox drag/drop
eImg.setAttribute("src", "%%RESOURCES%%/" + sFilename);
eImg.setAttribute("alt", getString("alt"));
eImg.setAttribute("style", "vertical-align:-" + (e.getHeight() - e.getBaseline()) + "px;");
if (bSpaceAfter) XML.createText(eEnsureSpaces, " ");
qc.addTextEquivalent(getString("alt"));
String sJavascript = "addOnLoad(function() { inlinePositionFix('" + sImageID + "'";
for (int i = 0; i < apPlaces.length; i++) {
Place p = apPlaces[i];
// Must get the label even though not using it, just to indicate that
// it's been used
if (p.sLabelFor != null) LabelComponent.getLabel(getQDocument(), bPlain, p.sLabelFor);
int iEffectiveWidth = (int) Math.round(dZoom * p.iWidth),
iEffectiveHeight = (int) Math.round(dZoom * p.iHeight);
String sPlaceholderID = QDocument.ID_PREFIX + getID() + "_" + p.sID;
Element ePlace = XML.createChild(eEnsureSpaces, "div");
ePlace.setAttribute("class", "placeholder");
ePlace.setAttribute("id", sPlaceholderID);
ePlace.setAttribute(
"style",
"width:"
+ iEffectiveWidth
+ "px; "
+ "height:"
+ iEffectiveHeight
+ "px; "
+ "visibility:hidden;");
QComponent qcPlaceComponent = p.qc;
if (qcPlaceComponent.isPropertyDefined(PROPERTY_FORCEWIDTH)
&& qcPlaceComponent.isPropertyDefined(PROPERTY_FORCEHEIGHT)) {
qcPlaceComponent.setInteger(PROPERTY_FORCEWIDTH, iEffectiveWidth);
qcPlaceComponent.setInteger(PROPERTY_FORCEHEIGHT, iEffectiveHeight);
}
if (p.sLabel != null) qc.addTextEquivalent(p.sLabel);
qc.setParent(ePlace);
qcPlaceComponent.produceOutput(qc, bInit, bPlain);
qc.unsetParent();
sJavascript += ",['" + sPlaceholderID + "'," + p.iActualX + "," + p.iActualY + "]";
}
sJavascript += "); });";
if (apPlaces.length > 0) // No JS needed if there weren't any placeholders
{
Element eScript = XML.createChild(eEnsureSpaces, "script");
eScript.setAttribute("type", "text/javascript");
XML.createText(eScript, sJavascript);
}
}
}
@Override
protected void initChildren(Element eThis) throws OmException {
Node nPrevious = eThis.getPreviousSibling();
if (nPrevious != null && nPrevious instanceof Text) {
String sText = ((Text) nPrevious).getData();
if (sText.length() > 0 && Character.isWhitespace(sText.charAt(sText.length() - 1)))
bSpaceBefore = true;
}
Node nAfter = eThis.getNextSibling();
if (nAfter != null && nAfter instanceof Text) {
String sText = ((Text) nAfter).getData();
if (sText.length() > 0 && Character.isWhitespace(sText.charAt(0))) bSpaceAfter = true;
}
List<Place> lPlaces = new LinkedList<Place>();
int iPlace = 0;
StringBuffer sbText = new StringBuffer();
for (Node n = eThis.getFirstChild(); n != null; n = n.getNextSibling()) {
if (n instanceof Element) {
Element eplace = (Element) n;
if (!eplace.getTagName().equals("eplace"))
throw new OmFormatException("<equation> may only contain text and <eplace> tags");
Element[] aeChildren = XML.getChildren(eplace);
QComponent qcChild;
boolean bImplicit = false;
if (aeChildren.length != 1) // Treats more than one child as inside <t>
{
qcChild = getQDocument().build(this, eplace, "t");
bImplicit = true;
} else // Treats single child as specific component (auto-sizing works)
qcChild = getQDocument().build(this, aeChildren[0], null);
addChild(qcChild); // Must be stored in standard child array so it
// can be found etc.
// See if width/height is specified
int iWidth, iHeight;
if (eplace.hasAttribute("width") && eplace.hasAttribute("height")) {
try {
iWidth = Integer.parseInt(eplace.getAttribute("width"));
iHeight = Integer.parseInt(eplace.getAttribute("height"));
} catch (NumberFormatException nfe) {
throw new OmFormatException("<equation> <eplace>: width= and height= must be integers");
}
} else {
Dimension d = qcChild.getApproximatePixelSize();
if (d == null)
throw new OmFormatException(
"<equation> <eplace>: Except for components that support automatic "
+ "size estimation and fixing, <eplace> must include width= and height=");
iWidth = d.width;
iHeight = d.height;
}
Place p = new Place();
p.sID = "p" + (iPlace++);
p.qc = qcChild;
p.iWidth = iWidth;
p.iHeight = iHeight;
p.bImplicit = bImplicit;
if (!eplace.hasAttribute("label"))
throw new OmFormatException("<equation> <eplace>: Must include label=");
if (eplace.hasAttribute("label")) p.sLabel = eplace.getAttribute("label");
else p.sLabel = null;
if (eplace.hasAttribute("for")) p.sLabelFor = eplace.getAttribute("for");
else if (qcChild instanceof Labelable) p.sLabelFor = qcChild.getID();
lPlaces.add(p);
// Add in the equation format text representing the placeholder
sbText.append("\\placeholder{" + p.sID + "}{" + p.iWidth + "," + p.iHeight + "}");
} else if (n instanceof Text) {
sbText.append(n.getNodeValue());
}
}
sEquation = sbText.toString();
apPlaces = lPlaces.toArray(new Place[0]);
}