Finding the Location of a Button in a Table
题
I am currently having trouble finding the index/location of a button in a table I am generating.
private class Node
{
String id;
String[] data;
List<Node> children = new ArrayList<Node>();
}
private Node root = buildTree();
private Node buildTree()
{
Node root = new Node();
root.id = "Main Component";
root.data = new String[]{ "example", "example", "example", "example", "example", "example",};
Node child1 = new Node();
child1.id = "Part 1";
child1.data = new String[]{ "example", "example", "example", "example", "example", "example", "example"};
root.children.add(child1);
Node child11 = new Node();
child11.id = "Part 1-1";
child11.data = new String[]{ "example", "example", "example", "example", "example", "example", "example"};
child1.children.add(child11);
Node child2 = new Node();
child2.id = "Part 2";
child2.data = new String[]{ "example", "example", "example", "example", "example", "example", "example"};
root.children.add(child2);
Node child21 = new Node();
child21.id = "Part 2-1";
child21.data = new String[]{ "example", "example", "example", "example", "example", "example", "example"};
child2.children.add(child21);
Node child22 = new Node();
child22.id = "Part 2-2";
child22.data = new String[]{ "example", "example", "example", "example", "example", "example", "example"};
child2.children.add(child22);
Node child3 = new Node();
child3.id = "Part 3";
child3.data = new String[]{ "example", "example", "example", "example", "example", "example", "example"};
root.children.add(child3);
Node child31 = new Node();
child31.id = "Part 3-1";
child31.data = new String[]{ "example", "example", "example", "example", "example", "example", "example"};
child3.children.add(child31);
Node child32 = new Node();
child32.id = "Part 3-2";
child32.data = new String[]{ "example", "example", "example", "example", "example", "example", "example"};
child3.children.add(child32);
return root;
}
Here is my data model. The idea here is that I will add rows to the table with a couple functions however I am stuck at an early step.
private void addRow(Node nde)
{
HorizontalPanel buttonPanel = new HorizontalPanel();
ListBox comboBox = new ListBox();
comboBox.addItem("option1");
comboBox.addItem("option2");
comboBox.addItem("option3");
comboBox.addItem("option4");
comboBox.addItem("option5");
Button addRowButton = new Button("+/-");
addRowButton.addClickHandler(new ClickHandler() {
public void onClick(ClickEvent event) {
//Get the button from the click event
//Get the row from the button - could I possibly set a class to each button that equals the id of the element being added so that I could just pull the id from the button
//Use the row to get the first column - returns a panel
//Get the components on the panel, find the label, and get the text
String id = "";
clickFunction(id);
}
});
buttonPanel.add(addRowButton);
buttonPanel.add(new Label(nde.id));
int row = flexTable.getRowCount();
flexTable.setWidget(row,0,buttonPanel);
flexTable.setWidget(row,1,comboBox);
flexTable.setText(row,2,nde.data[0]);
flexTable.setText(row,3,nde.data[1]);
flexTable.setText(row,4,nde.data[2]);
flexTable.setText(row,5,nde.data[3]);
flexTable.setText(row,6,nde.data[4]);
flexTable.setText(row,7,nde.data[5]);
}
This is how I am adding rows, there is a horizontal panel in the first column of every row, the first element is a button and the second is a title that matches the ID of whatever node is being displayed in that row. I need a way to get that id, set it equal to the string and pass it into my clickFunction.
private void clickFunction(String curRowId)
{
Node rowNode = findNode(root, curRowId);
//need to determine whether or not the tree needs to be expanded or minimized.
for(Node n : rowNode.children) {
addRow(n);
}
}
clickFunction uses the id passed in my findNode function
private Node findNode(Node nde, String id)
{
if(nde.id.equals(id))
{
return nde;
}
for(Node n : nde.children)
{
Node rtrn = findNode(n, id);
if(rtrn != null)
{
return rtrn;
}
}
return null;
}
Which is called recursively to tell the code which node needs its children extended. I hope this was not too long, I wanted to make sure I included all relevant info and proved I'm actually working hard to remedy problems I'm having. Its definitely frustrating when I've worked so much out but can't figure out a seemingly simple problem.
Any information is greatly appreciated! Much thanks in advance!
解决方案
To set the id for the button, you can do something like this...
Button b = new Button();
DOM.setElementAttribute(b.getElement(), "id", "my-button-id");
You should then be able to match it in your findNode method.
See http://google-web-toolkit.googlecode.com/svn/javadoc/1.5/com/google/gwt/user/client/DOM.html for more information on working with the DOM.