/**
* This method causes a transfer to a component from a clipboard or a DND drop operation. The
* Transferable represents the data to be imported into the component.
*
* @param comp The component to receive the transfer. This argument is provided to enable sharing
* of TransferHandlers by multiple components.
* @param t The data to import
* @return <code>true</code> iff the data was inserted into the component.
*/
public boolean importData(JComponent comp, Transferable t) {
JTextComponent c = (JTextComponent) comp;
withinSameComponent = c == exportComp;
// if we are importing to the same component that we exported from
// then don't actually do anything if the drop location is inside
// the drag location and set shouldRemove to false so that exportDone
// knows not to remove any data
if (withinSameComponent && c.getCaretPosition() >= p0 && c.getCaretPosition() <= p1) {
shouldRemove = false;
return true;
}
boolean imported = false;
DataFlavor importFlavor = getImportFlavor(t.getTransferDataFlavors(), c);
if (importFlavor != null) {
try {
InputContext ic = c.getInputContext();
if (ic != null) ic.endComposition();
Reader r = importFlavor.getReaderForText(t);
handleReaderImport(r, c);
imported = true;
} catch (UnsupportedFlavorException ufe) {
ufe.printStackTrace();
} catch (BadLocationException ble) {
ble.printStackTrace();
} catch (IOException ioe) {
ioe.printStackTrace();
}
}
return imported;
}
/** Handles data import. */
@Override
public boolean importData(JComponent comp, Transferable t) {
// give the drop target (this EV) the view focus
requestViewFocus();
Point mousePos = ev.getMousePosition();
// ------------------------------------------
// Import handling is done in this order:
// 1) PlotPanel GeoElement copies
// 2) Images
// 3) Text
// 4) CASTableCells
// 5) GGB files
// ------------------------------------------
// try to get PlotPanel GeoElement copies
if (t.isDataFlavorSupported(PlotPanelEuclidianView.plotPanelFlavor)) {
try {
AbstractAction act =
(AbstractAction) t.getTransferData(PlotPanelEuclidianView.plotPanelFlavor);
act.putValue("euclidianViewID", ev.getViewID());
act.actionPerformed(new ActionEvent(act, 0, null));
} catch (UnsupportedFlavorException e) {
e.printStackTrace();
return false;
} catch (IOException e) {
e.printStackTrace();
return false;
}
return true;
}
// try to get an image
boolean imageDropped = ((GuiManagerD) ev.getApplication().getGuiManager()).loadImage(t, false);
if (imageDropped) return true;
// handle CAS table cells as simple latex string (not dynamic!!)
// ToDo: make it dynamic (after ticket 2449 is finished)
DataFlavor[] df = t.getTransferDataFlavors();
for (DataFlavor d : df) {
App.debug(d);
}
if (t.isDataFlavorSupported(CASTransferHandler.casTableFlavor)) {
try {
// after it is possible to refer to cas cells with "$1" we can refer dynamically
// String tableRef;
StringBuilder sb = new StringBuilder("FormulaText[$");
sb.append(1 + (Integer) t.getTransferData(CASTransferHandler.casTableFlavor));
sb.append("]");
// tableRef = "$" + (cellnumber+1);
// create a GeoText on the specific mouse position
GeoElement[] ret =
ev.getApplication()
.getKernel()
.getAlgebraProcessor()
.processAlgebraCommandNoExceptionHandling(sb.toString(), true, false, false);
if (ret != null && ret[0].isTextValue()) {
GeoText geo = (GeoText) ret[0];
geo.setLaTeX(true, false);
// TODO: h should equal the geo height, this is just an
// estimate
double h = 2 * app.getFontSize();
geo.setRealWorldLoc(
ev.toRealWorldCoordX(mousePos.x), ev.toRealWorldCoordY(mousePos.y - h));
geo.updateRepaint();
}
return true;
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
// check for ggb file drop
boolean ggbFileDropped = ((GuiManagerD) app.getGuiManager()).handleGGBFileDrop(t);
if (ggbFileDropped) return true;
// handle all text flavors
if (t.isDataFlavorSupported(DataFlavor.stringFlavor)
|| t.isDataFlavorSupported(AlgebraViewTransferHandler.algebraViewFlavor)) {
try {
String text = null; // expression to be converted into GeoText
boolean isLaTeX = false;
// get text from AlgebraView flavor
if (t.isDataFlavorSupported(AlgebraViewTransferHandler.algebraViewFlavor)) {
isLaTeX = true;
// get list of selected geo labels
ArrayList<String> list =
(ArrayList<String>) t.getTransferData(AlgebraViewTransferHandler.algebraViewFlavor);
// exit if empty list
if (list.size() == 0) return false;
// single geo
if (list.size() == 1) {
text = "FormulaText[" + list.get(0) + ", true, true]";
}
// multiple geos, wrap in TableText
else {
text = "TableText[";
for (int i = 0; i < list.size(); i++) {
text += "{FormulaText[" + list.get(i) + ", true, true]}";
if (i < list.size() - 1) {
text += ",";
}
}
text += "]";
}
}
// get text from String flavor
else {
try {
// first try to read text line-by-line
Reader r = textReaderFlavor.getReaderForText(t);
if (r != null) {
StringBuilder sb = new StringBuilder();
String line = null;
BufferedReader br = new BufferedReader(r);
line = br.readLine();
while (line != null) {
sb.append(line + "\n");
line = br.readLine();
}
br.close();
text = sb.toString();
}
} catch (Exception e) {
App.debug("Caught exception decoding text transfer:" + e.getMessage());
}
// if the reader didn't work, try to get whatever string is
// available
if (text == null) text = (String) t.getTransferData(DataFlavor.stringFlavor);
// exit if no text found
if (text == null) return false;
// TODO --- validate the text? e.g. no quotes for a GeoText
// wrap text in quotes
text = "\"" + text + "\"";
}
// ---------------------------------
// create GeoText
GeoElement[] ret =
ev.getApplication().getKernel().getAlgebraProcessor().processAlgebraCommand(text, true);
if (ret != null && ret[0].isTextValue()) {
GeoText geo = (GeoText) ret[0];
geo.setLaTeX(isLaTeX, false);
// TODO: h should equal the geo height, this is just an
// estimate
double h = 2 * app.getFontSize();
geo.setRealWorldLoc(
ev.toRealWorldCoordX(mousePos.x), ev.toRealWorldCoordY(mousePos.y - h));
geo.updateRepaint();
}
return true;
} catch (UnsupportedFlavorException ignored) {
// TODO
} catch (IOException ignored) {
// TODO
}
}
return false;
}