Simple dart code:
class User {
String name;
User(this.name);
}
main() {
List<User> users = [new User('Freewind')];
var list = new List.from(users);
print(list.first.name); // ***
}
Notice the line ends with '// *'.
My IDEA editor doesn't recognize list.first as a User, since it can't do the autocompletion when I typed '.name'.
So I have to declare the type:
List<User> list = new List.from(users);
It works but I want to know if there is any other way to let compiler know list has type List<User>?
I tried:
var list = new List<User>.from(users);
Which has wrong syntax.
This one works for me in DartEditor (no error/warning/hint) and of course executes successfully
var list = new List<User>.from(users);
Related
I have an Apps Script that copies the content of an template-file to the end of a document. It works with one minor annoyance: the numbered list continues from one copy to the next.
I have many different templates that users can append to the end of the document. Each template is stored in its own Document.
function addSub(template_id){
var mainBody = DocumentApp.getActiveDocument().getBody();
var tempBody = DocumentApp.openById(template_id).getBody();
for(var i = 0;i<tempBody .getNumChildren();i++){
var element = tempBody .getChild(i);
if(element.getType() == DocumentApp.ElementType.TABLE)
mainBody.appendTable(element.copy());
else if(element.getType() == DocumentApp.ElementType.PARAGRAPH)
mainBody.appendParagraph(element.copy());
else if(element.getType() == DocumentApp.ElementType.LIST_ITEM)
mainBody.appendListItem(element.copy());
else if(element.getType() == DocumentApp.ElementType.PAGE_BREAK)
mainBody.appendPageBreak(element.copy());
}
}
It could look like this: ( I want the list to reset for each new copy of the template)
table with name of this template
some raw text
List item1
List item2
table with name of this template
some raw text
List item1
List item2
Do you now that ListItems have an ID, which is a STRING and you can access it via myListItem.getListId().
It seems that all your ListItems have the same ID.
If this is the case, the numbering has to be as you described.
Why do they have the same ListID?
I don't know.
Seems that the body.appendListem method always chooses the same listId.
I didn't test it yet, but you could try to set the listID of the newly append ListItem to that of the original document, if they are different.
Yes, i know, the .copy() method should enclose this information, but the body.appendListItem method may not care.
So, you could try to first save the detached copy of the listItem.
Then append it to the new body.
And then set the id of the newly appended listItem to that of the detached copy.
It's stupid, i know, but it may help.
Didn't try it yet.
And i have little experience with listItems, bit what i saw up to now is that there seems to be only one ListId in the body of a document, if you append or insert listItems.
This could be the cause of the problem.
Hope this helps.
After Richard Gantz solved it, It was corrected by this code:
var listItemDictionary = {};//top
...
else if(element.getType() == DocumentApp.ElementType.LIST_ITEM){
var listCopy = element.copy().asListItem()
var lcID = listCopy.getListId();
if (listItemDictionary[lcID] == null){
var tempLI = mainBody.appendListItem("temp")
listItemDictionary[lcID] = tempLI;
}
Logger.log(lcID)
mainBody.insertListItem(childIndex+j, listCopy.setListId(listItemDictionary[lcID]));
}
...
if(listItemDictionary){//bottom
mainBody.appendParagraph("");
for(var key in listItemDictionary){
listItemDictionary[key].clear().removeFromParent()
}
}
Based on the answer from Niklas Ternvall/Richard Gantz, I found a simpler solution for the case of each template having no more than one list.
function addSub(template_id) {
var mainBody = DocumentApp.getActiveDocument().getBody();
var tempBody = DocumentApp.openById(template_id).getBody();
var listID = null;
for(var i = 0;i<tempBody.getNumChildren();i++){
var element = tempBody.getChild(i).copy();
var type = element.getType();
if(type == DocumentApp.ElementType.TABLE)
mainBody.appendTable(element);
else if(type == DocumentApp.ElementType.PARAGRAPH)
mainBody.appendParagraph(element);
else if(type == DocumentApp.ElementType.LIST_ITEM){
if(listID==null) // First list item
listID = mainBody.appendListItem('temp'); // Define new listID
mainBody.appendListItem(element).setListId(listID); // Apply to copy
}
else if(type == DocumentApp.ElementType.PAGE_BREAK)
mainBody.appendPageBreak(element);
}
mainBody.removeChild(listID); // Delete temporary list item
}
Each time you call the function, listID=null is the indicator for whether or not there have been any list items in the template. When you get to the first list item, appending the text 'temp' forces a new list and hence a new listID that you can apply to the list items from the template. After you finish going through the template, mainBody.removeChild(listID) removes 'temp' from the top of your list.
This solution worked for me when using one template 100 times in one document, essentially as a mail merge. I'm fairly new to Apps Script, so I would appreciate any feedback if there is a reason this wouldn't work for a single-list template.
Am trying to read some values from database and display it in a List.
list = new List();
list.setSize(30, 280);
try {
Class.forName("com.mysql.jdbc.Driver");
connect = DriverManager
.getConnection("jdbc:mysql://localhost:3306/project?"
+ "user=root&password=virus");
statement = connect.createStatement();
preparedStatement = connect
.prepareStatement("select subname from subject");
rs=preparedStatement.executeQuery();
while (rs.next()) {
subject = rs.getString("subname");
list.add(subject);
}
}
The import statement for List is-
import java.awt.List;
So I think List control is not available in JavaFX.
I tried to place the List in HBox -
hb.getChildren().addAll(addSubName, list, b2);
Then I got an error -
method addAll in interface ObservableList<E> cannot be applied to given types;
required: Node[]
found: TextField,List,Button
reason: varargs mismatch; List cannot be converted to Node
where E is a type-variable:
E extends Object declared in interface ObservableList
Is this error correctable ? If not, tell me about a control that can be used as a substitute for List in JavaFX.
Given the following snippet from my test:
var mockProvider = MockRepository.GenerateMock<IItemProvider>();
var target = new ItemService(mockProvider);
target.SaveItem(item);
Internally target.SaveItem makes a call like this:
provider.SaveItem(new SaveContract(item.Id, user, contents)); where provider is the local name for the mockProvider passed in.
How do I:
Verify provider.SaveItem is called whilst also
Asserting that the values of item.Id, user and contents are as they should be.
I think I might be able to use mockProvider.AssertWasCalled but can't figure out the syntax to set the condition of the parameters passed to the constructor of SaveContract.
TIA
Ok so based on this I did something like the following:
var mockProvider = MockRepository.GenerateMock<IItemProvider>();
var target = new ItemService(mockProvider);
Item testItem = null;
mockProvider.Expect(c => c.SaveItem(Arg<Item>.Is.Anything))
.WhenCalled(call =>
{
testItem = (Item)call.Arguments[0];
});
target.SaveItem(item);//item initialised elsewhere
Assert.AreEqual(item.Id, testItem.Id);
My code is like this:
Dictionary<string, string> specialCharacters = new Dictionary<string, string>();
specialCharacters.Add("#", "%");
specialCharacters.Add("*", "^");
List<Action<Employee>> listOfDel = new List<Action<Employee>>();
foreach (KeyValuePair<string, string> character in specialCharacters)
{
Action<Employee> replace = (empData) => empData.EmpName = empData.EmpName.ToString().Replace(character.Key, character.Value);
listOfDel.Add(replace);
//listOfDel.Add(new Action<Employee>((empData) => empData.EmpName = empData.EmpName.ToString().Replace(character.Key, character.Value)));
}
The issue is the list listOfDel has the same action as it refers to same function replace which takes value of last pair of character.Key, character.Value (("", "^")
I want a result having different actions in the list of actions listOfDel , where each method will have different value present. ("#", "%"), ("", "^");
I also tried creating a new instance of action delegate and using it as anonymous method.Please see commented code, yet the problem is not solved.
The problem is that you're capturing the iterator variable. There's only one variable declared by the foreach loop, so by the time you execute the delegates, they'll all be using the same value (they all refer to the same delegate). For C# 4 and earlier, you just need to create a copy:
foreach (KeyValuePair<string, string> character in specialCharacters)
{
var copy = character;
Action<Employee> replace = empData => empData.EmpName =
empData.EmpName.ToString().Replace(copy.Key, copy.Value);
listOfDel.Add(replace);
}
C# 5 will render this unnecessary, as foreach will be fixed so that each iteration will have a separate variable as far as anonymous functions are concerned.
See Eric Lippert's blog post "Closing over the loop variable considered harmful" for more information.
I have absolutely no knowledge in Regex whatsoever. Basically what I'm trying to do is have an error class that I can use to call errors (obviously) which looks like this:
package avian.framework.errors
{
public class AvError extends Object
{
// errors
public static const LAYER_WARNING:String = "Warning: {0} is not a valid layer - the default layer _fallback_ has been used as the container for {1}.";
/**
* Constructor
* Places a warning or error into the output console to assist with misuse of the framework
* #param err The error to display
* #param params A list of Objects to use throughout the error message
*/
public function AvError(err:String, ...params)
{
trace(err);
}
}
}
What I want to be able to do is use the LAYER_WARNING like this:
new AvError(AvError.LAYER_WARNING, targetLayer, this);
And have the output be something along the lines of:
Warning: randomLayer is not a valid layer - the default layer _fallback_ has been used as the container for [object AvChild].
The idea is to replace {0} with the first parameter parsed in ...params, {1} with the second, etc.
I've done a bit of research and I think I've worked out that I need to search using this pattern:
var pattern:RegExp = /{\d}/;
You can use StringUtil
var original:String = "Here is my {0} and my {1}!";
var myStr:String = StringUtil.substitute(original, ['first', 'second']);
Using the g flag in RegExp you can create an array containing all of your {x} matches, then loop through this array and replace each of the matches with the appropriate parameter.
Code:
var mystring:String = "{0} went to {1} on {2}";
function replace(str:String, ...params):String
{
var pattern:RegExp = /{\d}/g;
var ar:Array = str.match(pattern);
var i:uint = 0;
for(i; i<ar.length; i++)
{
str = str.split(ar[i]).join(params[i]);
}
return str;
}
trace(replace(mystring, "marty", "work", "friday")); // marty went to work on friday
i'm assuming you want to have several static constants with varying replacement instances ({0}, {1}, {2}, etc.) in each string constant.
something like this should work - sorry, it's untested:
public function AvError(err:String, ...params)
{
var replacementArray:Array = err.match(new RegExp("{\\d}", "g"));
for (var i:int = 0, i < replacementArray.length, i++)
err = err.replace(new RegExp(replacementArray[i], "g"), params[i]);
trace(err);
}
if you do have several static constants with varying replacement instances, you'll want to check for an appropriate matching amount of …params that are passed.