G4P example request (GTextField)

yourez

G4P example request (GTextField)

in Contributed Library Questions • 8 months ago

Hi!

I'm new for Processing and trying to make simple sketch using GTextField with G4P (GUI sketch was built by gui builder). Could someone please write short example of sketch with CHANGE event?

So, I need two text fields and want to calculate some expression using first field and resulting to second field, but want to make real-time calculating during first filed typing (for example, textField2=textField1*3.1415). I think, I have to use CHANGE event to react typing, but don't know how.

Help me please

Replies(5)

quarks

Re: G4P example request (GTextField)

8 months ago

I used G4P builder to create a sketch with 2 textfields and a label using defaults identifiers for the controls and event handlers.

I then added code to the event handlers for both textfields that displayed the text in the label when typing in either textfield.

The code below is in the gui tab

void textfield1_change1(GTextField source, GEvent event) { //_CODE_:textfield1:364053:
if(event == GEvent.CHANGED){
label1.setText(source.getText());
}
} //_CODE_:textfield1:364053:
void textfield2_change1(GTextField source, GEvent event) { //_CODE_:textfield2:343569:
if(event == GEvent.CHANGED){
label1.setText(source.getText());
}
} //_CODE_:textfield2:343569:
// Create all the GUI controls.
// autogenerated do not edit
void createGUI(){
G4P.setGlobalColorScheme(GCScheme.BLUE_SCHEME);
G4P.messagesEnabled(false);
G4P.setCursorOff(ARROW);
if(frame != null)
frame.setTitle("Sketch Window");
textfield1 = new GTextField(this, 55, 56, 160, 30, G4P.SCROLLBARS_NONE);
textfield1.addEventHandler(this, "textfield1_change1");
textfield2 = new GTextField(this, 57, 12, 160, 30, G4P.SCROLLBARS_NONE);
textfield2.addEventHandler(this, "textfield2_change1");
label1 = new GLabel(this, 57, 109, 157, 44);
label1.setText("My label");
label1.setOpaque(false);
}
// Variable declarations
// autogenerated do not edit
GTextField textfield1;
GTextField textfield2;
GLabel label1;

yourez

Re: G4P example request (GTextField)

8 months ago

Thank you very much quarks! It's all I need!

Best wishes!

yourez

Re: G4P example request (GTextField)

8 months ago

I have some little question again...

I wrote this code for duplicating of textField1 into textField2:

void textfield1_change1(GTextField source, GEvent event) { //_CODE_:tf1:207604:
if(event == GEvent.CHANGED){
tf2.setText(source.getText());
}
} //_CODE_:tf1:207604:

But textField2 won't to redraw itself during typing in textField1. textField2 updates on getting focus only. How can I force textFiled2 to redraw automatically during typing in another textField1?

quarks

Re: G4P example request (GTextField)

8 months ago

This is obviously a bug in the library - setText() should cause the text to be displayed immediately.

But there is good news because I built in a safety feature in case this happened - you can force a GUI update for any control with the forceBufferUpdate() method so add an extra line as shown below.

void textfield1_change1(GTextField source, GEvent event) { //_CODE_:tf1:207604:
if(event == GEvent.CHANGED){
tf2.setText(source.getText());
tf2.forceBufferUpdate();
}
} //_CODE_:tf1:207604:

yourez

Re: G4P example request (GTextField)

8 months ago

Thanks again!

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