Create Components automatically
Hello m8s!
Following problem: I want to create more components during the run of my program.
More details:
- My program is able to let the user choose a file. This can be done via one JTextField or one JButton("browse").
- Sometimes the user is allowed to choose more files after he choosed the first file
- In that case i want to create automatically a new Compoment (e.g. "browsePanel")
- But i want that all elements in it (JTextField and JButton) get their FocusListener,ActionListener and MouseListener.
- How can this be done?
- How can i use that component in my Listeners? (e.g. if(e.getSource() == browseButton))
- I cant use that code for components i dont know their Fieldname, etc...
Thanks for your help! And if you have question and did not understand my problem, please ask ;)
Greetings
Martin
Message was edited by:
ErlemanM
[933 byte] By [
ErlemanMa] at [2007-11-26 19:19:39]
# 1
[bump]nobody knows the answer?where is the allknown "nobody"? ;)[/bump]
# 2
> [bump]
> nobody knows the answer?
>
> where is the allknown "nobody"? ;)
> [/bump]
I follow you till this point:
How can this be done?
What be done? Be specific.
- How can i use that component in my Listeners? (e.g. if(e.getSource() == browseButton))
What is keeping you from using it? (You know you can have multiple ActionListeners that listen to individual buttons, rather than chaining if statements).
- I cant use that code for components i dont know their Fieldname, etc...
Here is an example of a component that is used and has no field name:
JPanel panel = new JPanel();
panel.add(new JTextField());
# 3
hmmm, my problem is the following:
- i want a function that returns me a JPanel that includes two components (JTextField and JButton).
- and i want that those included components have their specific actionlistener, because i need to control both components specific
- something like this will i need
if(userChoosedFilePath() &&userIsAllowedToChooseMoreFiles())
createBrowseField()
sure that useChoosedFilePath() will be handled with an extension of ActionHandler that checks for actions on the JTextField and JButton.
Hopefully that helps?
Sorry for my primitive english ;) Im doing my best...
Martin
Message was edited by:
ErlemanM
null
# 4
> hmmm, my problem is the following:
>
> - i want a function that returns me a JPanel that
> includes two components (JTextField and JButton).
> - and i want that those included components have
> their specific actionlistener, because i need to
> control both components specific
> - something like this will i need
I am following you so far.
> [code]
> if(userChoosedFilePath() &&
>userIsAllowedToChooseMoreFiles())
> createBrowseField()
>
>
> sure that useChoosedFilePath() will be handled with
> an extension of ActionHandler that checks for actions
> on the JTextField and JButton.
I think I understand what you want to do. It sounds possible but I don't see a question?
> Hopefully that helps?
>
> Sorry for my primitive english ;) Im doing my
> best...
Your English is fine, I just don't see what your Java question is specifically. Maybe posting an example or a pseudocode version of what you want to happen.
# 5
hmm, i thought i did :)
ok, another try:
//pseudoCode of PseudoMain.java
public void createRightPanel()
{
// some other JPanels and JTextFields
//adding browsePanel to a Field called "rightPanel"
rightPanel.add(createBrowsePanel(),BorderLayout.SOUTH);
}
public Component createBrowsePanel()
{
//i thought about a custom class "BrowsePanel"
BrowsePanel bp = new BrowsePanel();
JPanel browsePanel = bp.getBrowsePanel();
//browseField and browseButton are Fields in PseudoMain.java
browseField = (JTextField) browsePanel.getComponent(0);
browseButton = (JButton) browsePanel.getComponent(1);
// adding Listeners (contained in same Class PseudoMain.java) to my Components
browseField.addMouseListener(new MyMouseListener());
browseField.addFocusListener(new MyFocusListener());
browseButton.addActionListener(new MyActionListener());
}
//
my Listener Classes check for following:
if(browseFieldContainsExistingFile() || UserChoosedFileByBrowseButton() && userIsAllowedToChooseMoreFiles())
{
// adding another BrowsePanel to my righPanel with all Listeners to it...
rightPanel.add(createBrowsePanel(),BorderLayout.SOUTH);
}
# 6
//class BrowsePanel.java
public class BrowsePanel extends JPanel
{
private JTextField browseField;
private JButton browseButton;
public BrowsePanel()
{
}
public BrowsePanel getBrowsePanel()
{
setLayout(new BorderLayout());
Icon icon = new ImageIcon(System.getProperty("user.dir")+"/icons/searchtopic.gif");
browseButton = new JButton("browse",icon);
browseButton.setEnabled(false);
browseField = new JTextField();
browseField.setEditable(false);
add(browseField,BorderLayout.CENTER);
add(browseButton,BorderLayout.LINE_END);
return this;
}
}
blub
# 7
I still can't find a question? I understand what you want to do, but I don't know what you are asking? What is your specific question?
# 8
ok, if i have more than one browsePanels added to my rightPanel; how can i then communicate to all components?
at the moment my listeners work like this:
public class MyFocusListener implements FocusListener
{
public void focusGained(FocusEvent e)
{
// TODO Auto-generated method stub
}
//here is my problem: When i create more BrowsePanels i cannot talk to the previous browseField
//(or browsebutton) because they are overwritten by my "createBrowsePanel()" function.
public void focusLost(FocusEvent e)
{
if(e.getSource() == browseField)
if(new File(browseField.getText()).exists())
{
addFileToList();
if(UserIsAllowedToChooseMoreFiles)
createBrowsePanel();
}
}
}
maybe i have to add to browsePanel a specific SerialNumber to identify a component?!
# 9
Well, what about having your createBrowsePanel method add each browse panel to a list. Then you can iterate through them when you need to.
# 10
hmm, ok i磍l try your solution :)thanks for your help!
