Processing 1.0 - Processing Discourse - question about GUI event handling

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question about GUI event handling (Read 2883 times)

kvaa47

question about GUI event handling
Apr 28^th, 2005, 10:16pm

Hello,

Now I'm doing simple work using customized GUI interface.
The problem at the monent is button handling.
What I'd like to do is showing JFileChooser by pressing a button, but because my button check the mouse-click in the draw() loop as below, there's a problem.

void draw() {
...
if(aButton.pressed()) {
JFrame f = new JFrame("File Selection Test");
JFileChooser fc = new JFileChooser();
fc.showOpenDialog(f);
}
}

and in a MyButton class,
boolean pressed() {
if(mouseX>=x && mouseX<=(x+w) &&
mouseY>=y && mouseY<=(y+t)) {
if(mousePressed) {
return true
} else {
return false;
}
}else {
return false;
}

because this loop runs by framerate, though I pressed mouse button(or I thought that) one time, it actually runs more than one time, and it crashes.
I found if I use AWT button instead this isn't a problem, but then actual P5 palette(or pane) is not the same as button's, so I need to think about the layout.

So, my questions are,
1) Is it right approach to open file-selection window?
2) Are there another way to use component's events?
3) Is it possible to add AWT components into main P5 pane directly?

Thanks!
Sou

fry

Re: question about GUI event handling
Reply #1 - Apr 29^th, 2005, 12:19am

1) not really.. use inputFile() or inputFile("Choose a file"), which is a wrapper on the file chooser class that just returns the selected file (or null) for you. this might not be documented Wink

2) not sure i understand.

3) short answer is no, long answer is that you should instead be making your own java application, and you can embed a PApplet from processing inside of that, since a PApplet is just a Component like any other. unfortunately, to do that sort of thing you should use something like eclipse since processing's not really made for it.

kvaa47

Re: question about GUI event handling
Reply #2 - Apr 29^th, 2005, 6:01am

Thanks, Fry.

I've check inputFile(). Finally inputFile() or FileDialog works fine in PDE(though sometimes gets error), but I've found it doesn't work properly in Eclipse. For example, if I use the code below in a loop or mouse-event method, (when using in setup(), that's ok)

File file = inputFile();
if(file!=null) {
System.out.println(file.getName());
}

in PDE it works, but in Eclipse line3 which prints filename runs before dialog popup or freeze. It seems strange to me Sad

K. Damkjer

Re: question about GUI event handling
Reply #3 - Apr 29^th, 2005, 6:31am

You probably want to declare
Code:

File file;

as a global,
initialize it in setup (or through some triggered event),
Code:

void setup() {
  size(200, 200, P3D); // don't forget this line
  file = inputFile();
}

then in draw, work with the file
Code:

void draw() {
  if(file != null) {
    println(file.getName());
  }
}

fry YaBB Moderator Offline Posts: 2623 mass, usa	Re: question about GUI event handling Reply #4 - Apr 29^th, 2005, 8:16am moving this over to the "integration" board.. for eclipse questions, it's mostly community supported or you're on your own since it's not something that casey and i can really support..

kvaa47

Re: question about GUI event handling
Reply #5 - Apr 30^th, 2005, 11:14am

Thanks, Damkjer and Fry.

What I'd actually like to do is to make the FileDialog pop whenever I click a certain button, so I put a line which calls inputFile() method in a mousePressed() method as below.

void mousePressed() {
...
if(aButton(pressed()) {
file = inputFile();
...
}
}

Sometimes it works and sometimes fails and freeze. And to me it seems to be related with P5 applet's timing.

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