I have a TextFlow that has an SelectionManager attached. I'd like to get the FlowElement that the cursor is inside of or if multiple lines are selected that the selection is inside of.
_textFlow.addEventListener(SelectionEvent.SELECTION_CHANGE,selectionChangeListener,false,0,true);
private function selectionChangeListener(e:SelectionEvent):void
{
var selectionState:SelectionState = e.selectionState;
var selectedElementRange:ElementRange = ElementRange.createElementRange(selectionState.textFlow, selectionState.absoluteStart, selectionState.absoluteEnd);
}
I found how to find the leaf element with the following method but still do not know how to find the element that contains the selection.
/** Returns the current FlowELement element at the currentStyleLevel */
private function currentStyleElement(absolutePosition:int):FlowElement
{
var e:FlowElement;
switch(currentStyleLevel)
{
case TextFlow:
e = _textFlow;
break;
case ParagraphElement:
e = _textFlow.findLeaf(absolutePosition).getParagraph();
break;
default:
e = _textFlow.findLeaf(absolutePosition);
}
return e;
}
Related
I am doing a project for nand2tetris. We write a program in Jack and test it on VMEmulator. The class looks like this:
class List {
field int data;
field List next;
/* Creates a new List object. */
constructor List new(int car, List cdr) {
let data = car;
let next = cdr;
return this;
}
/* Disposes this List by recursively disposing its tail. */
method void dispose() {
if (~(next = null)) {
do next.dispose();
}
// Use an OS routine to recycle the memory held by this object.
do Memory.deAlloc(this);
return;
}
/* Prints the list*/
method void print() {
do Output.printString(" -> ");
do Output.printInt(data);
if (~(next = null)) {
do next.print();
}
return;
}
/* Inserts the argument in the right position of the list (ascending order)*/
method void insertInOrder(int ins){
var List prev, curr, insert;
let prev = this;
let curr = prev.getnext();
while (ins > prev.getdata()){
if (ins < curr.getdata()){
let insert = List.new(ins, curr);
do prev.setnext(insert);
}
else{
let prev = prev.getnext();
let curr = prev.getnext();
}
}
return;
}
/* Searches the argument in the list, if found, it returns the corresponding List object*/
method List find(int toFind){
var List temp;
var List equal;
var boolean found;
let temp = this;
let found = false;
while (~(next = null)){
if(toFind = temp.getdata()){
let equal = temp;
let found = true;
}
let temp = temp.getnext();
}
if (found){
return equal;
}
else{
return null;
}
}
method List getnext(){
return next;
}
method void setnext(List object){
let next = object;
return;
}
method int getdata(){
return data;
}
}
It has one private variable data and a pointer next. So I wrote getter and setter method to return those values. Other methods are fine only the getdata()method is incorrect. When it runs through the VMEmulator, it shows the error Out of segment space in List.getdata.3. This shows in the VMEmulator.
0function List.getdata0
1push argument0
2pop pointer0
3push this 0
4return
the error is at the 4th line return. When I change the Jack code, the same error is still at the 4th line.
What exactly is the problem in my getter method?
When you run a VM program on the VMEmulator you must first manually set the pointers to the various segments, otherwise you may get an "Out of segment space" error.
To understand the necessary settings, look at what the corresponding .tst file does. An alternative method is to insert the proposed code inside a function, since the function call automatically makes this type of setting.
You can get this error when you try to access member data of an object which is not constructed. Could it be that the List cdr in the constructor was not properly constructed?
I could not parse my XML file, it returns only one element instead of 4
Here's my XML file
<Quizzs>
<Quizz type="A">...</Quizz>
<Quizz type="B">...</Quizz>
<Quizz type="C">...</Quizz>
<Quizz type="D">...</Quizz>
</Quizzs>
It returns only the last one "D"
while (eventType != XmlPullParser.END_DOCUMENT) {
var eltName: String? = null
when (eventType) {
XmlPullParser.START_TAG -> {
eltName = parser.name
if ("Quizzs" == eltName) {
currentQuizz = Quizz()
quizz.add(currentQuizz)
} else if (currentQuizz != null) {
if ("Quizz" == eltName) {
currentQuizz.type = parser.getAttributeValue(null, "type")
}
}
}
}
eventType = parser.next()
}
printPlayers(quizz)
}
You need to .add() something to your currentQuizz for each "Quizz". With currentQuizz.type = ... you just overwrite each previous "Quizz" with the current one, so you end up with only the last one, which is D.
I think you are confused by your own code. For the "Quizzs" tag you create a Quizz() object instead of a QuizzList() object or something similar. It is for the "Quizz" tag you should create a new Quizz() object each time. And then you should add that object to your QuizzList.
I'm trying to find the shortest path of finding friends. If person X wants to connect to person Y, I want to print out the shortest path of friends in order for X to get to Y. Everytime I run the code, I get null as a result.
public void shortest(String first, String target){
HashMap<String, String> prev = new HashMap<String, String>();
Queue<PersonNode> q = new LinkedList<PersonNode>();
PersonNode firstPerson = hash.get(first);
firstPerson.visited = true;
prev.put(first, first + " ");
q.add(firstPerson);
while(!q.isEmpty()){
PersonNode curr = q.remove();
if(!curr.visited){
curr.visited = true;
if(curr.equals(target)){
break;
}
else{
for(int i =0; i < curr.list.size(); i++){
if(curr.list.get(i).visited = false){
q.add(curr.list.get(i));
curr.list.get(i).visited = true;
prev.put(curr.list.get(i).name, prev.get(curr.list.get(i).name) + curr.list.get(i));
}
}
}
if(!curr.equals(target)){
System.out.println("They have no connections");
}
}
}
System.out.println(prev.get(target));
}
Try debugging your code. I see you set firstperson.visited to true outside of the loop. You then pop it from you queue and ignore it because it's true. It's the same inside your loop: you set all visited attributes to true which will cause them to be ignored when they get popped from the queue at runtime
I'm also thinking that the "they have no connections"-part should not be inside the while loop
I want to disable one specific row in datagrid in following manner:
1) Highlight one row with a different color
2) Disable checkbox/radio button selection of that row
3) Disable inline editing of cells present in that row but allow inline editing for other rows.
Pls. help if you have any ideas.
You can use a combination of the following functions to extract stuff
// as example, one of youre items uses identifier:'id' and 'id:10'
var identifier = '10';
var item = store._arrayOfTopLevelItems[10]; // you probably have this allready
var index = grid.getItemIndex(item); // find which index it has in grid
var rowNode = grid.getRowNode(index); // find a DOM element at that index
You will have the <div> as rowNode, it contains a table with cells (as many as you got columns). Set its background-color
The checkbox thing, you will prly know which cell-index it has
var cellNode = dojo.query('td[idx='+cellIndex+']', rowNode)[0];
// with cellType Bool, td contains an input
var checkbox = cellNode.firstChild;
Editing is another store really.. works in focus handlers. To override it, you must keep like an array of rows which you dont want editable (allthough the cell.editable == true).
function inarray(arr, testVal) {
return dojo.some(arr, function(val) { return val == testVal }).length > 0
}
grid.setNonEditable = function (rowIndex) {
if(! inarray(this.nonEditable,rowIndex) )
this.nonEditable.push(rowIndex);
}
grid.setEditable = function (rowIndex) {
this.nonEditable = dojo.filter(this.nonEditable, function(val) { return val != rowIndex; });
}
var originalApply = grid.onApplyEdit
grid.onApplyEdit = function(inValue, inRowIndex) {
if(! inarray(this.nonEditable,inRowIndex) )
originalApply.apply(this, arguments);
}
If you are using dojox.grid.DataGrid you can use canEdit function to disable row editing or cell editing :
grid = new dojox.grid.DataGrid({
canEdit: function(inCell, inRowIndex) {
var item = this.getItem(inRowIndex);
var value = this.store.getValue(item, "name");
return value == null; // allow edit if value is null
}
}
I'm wondering about JScript.NET private variables. Please take a look on the following code:
import System;
import System.Windows.Forms;
import System.Drawing;
var jsPDF = function(){
var state = 0;
var beginPage = function(){
state = 2;
out('beginPage');
}
var out = function(text){
if(state == 2){
var st = 3;
}
MessageBox.Show(text + ' ' + state);
}
var addHeader = function(){
out('header');
}
return {
endDocument: function(){
state = 1;
addHeader();
out('endDocument');
},
beginDocument: function(){
beginPage();
}
}
}
var j = new jsPDF();
j.beginDocument();
j.endDocument();
Output:
beginPage 2
header 2
endDocument 2
if I run the same script in any browser, the output is:
beginPage 2
header 1
endDocument 1
Why it is so??
Thanks,
Paul.
Just a guess, but it appears that JScript.NET doesn't support closures the same way as EMCAScript, so the state variable in endDocument() isn't referencing the private member of the outer function, but rather an local variable (undeclared). Odd.
You don't have to use new when calling jsPDF here since you're using a singleton pattern. jsPDF is returning an object literal so even without new you'll have access to the beginPage and endDocument methods. To be perfectly honest I don't know what the specifications call for when using new on a function that returns an object literal so I'm not sure if JScript.NET is getting it wrong or the browser. But for now try either getting rid of the new before jsPDF() or change your function to this:
var jsPDF = function(){
var state = 0;
var beginPage = function(){
state = 2;
out('beginPage');
};
var out = function(text){
if(state == 2){
var st = 3;
}
MessageBox.Show(text + ' ' + state);
};
var addHeader = function(){
out('header');
};
this.endDocument = function(){
state = 1;
addHeader();
out('endDocument');
};
this.beginDocument: function(){
beginPage();
};
}
That will allow you to use the new keyword and create more than one jsPDF object.
I've come across the same problem. In the following code, the closure bound to fun should contain only one variable called result. As the code stands, the variable result in the function with one parameter seems to be different to the result variable in the closure.
If in this function the line
result = [];
is removed, then the result in the line
return result;
refers to the result in the closure.
var fun = function() {
var result = [];
// recursive descent, collects property names of obj
// dummy parameter does nothing
var funAux = function(obj, pathToObj, dummy) {
if (typeof obj === "object") {
for (var propName in obj) {
if (obj.hasOwnProperty(propName)) {
funAux(obj[propName], pathToObj.concat(propName), dummy);
}
}
}
else {
// at leaf property, save path to leaf
result.push(pathToObj);
}
}
return function(obj) {
// remove line below and `result' 3 lines below is `result' in closure
result = []; // does not appear to be bound to `result' above
funAux(obj, [], "dummy");
return result; // if result 2 lines above is set, result is closure is a different variable
};
}();