Java Answers Forum - how to (re)paint an AWT applet faster

Articles |
News |
Weblogs |
Books |
Forums

Artima Forums | Articles | Weblogs | Java Answers | News

Sponsored Link •

Java Answers Forum
how to (re)paint an AWT applet faster

0 replies on 1 page.

Welcome Guest
Sign In

Back to Topic List

Reply to this Topic

Search Forum

Threaded View


Previous Topic		Next Topic

Flat View: This topic has 0 replies on 1 page

Tienshan

Posts: 7
Nickname: tienshan
Registered: Oct, 2004

how to (re)paint an AWT applet faster

Posted: Nov 14, 2004 9:11 AM

Is there a way to repaint this AWT applet of mine little bit faster? If I have 10 columns and 20 rows of textFields, when I repaint the applet, I can literally "see" the repainting being done, like an unseen hand sweeping clean the fields and then another hand putting the new fields in places. I will need to do better.

Does anyone have an advice?
Thank you.


import java.applet.Applet;
import java.awt.*;                            
import java.awt.event.*;

public class Test1112 extends Applet {
	int no_of_rec = 0;
	int index = 0;
	
	TextField[] txtDataRowDisplay1;
	TextField[] txtDataRowDisplay2;
	TextField[] txtDataRowDisplay3;
	TextField[] txtDataRowDisplay4;
	TextField[] txtDataRowDisplay5;
	TextField[] txtDataRowDisplay6;
	TextField[] txtDataRowDisplay7;
	TextField[] txtDataRowDisplay8;
	TextField[] txtDataRowDisplay9;
	TextField[] txtDataRowDisplay10;
	
	
	String[] data;
	Panel p1;
	GridBagConstraints c1;
	Panel pMain;
	Color pnlBgColor = new Color(144, 196, 222);
	
	Panel cPanel;
	
	public void init(){
		
		data = getData(index); 
		no_of_rec = data.length;
		
		//main Panel
		pMain = new Panel();
		pMain.setLayout(new GridBagLayout());
		GridBagConstraints c  = new GridBagConstraints();
		pMain.setBackground(pnlBgColor);
		
		//p0 
		Panel p0 = new Panel();
		p0.setLayout(new GridBagLayout());
		GridBagConstraints c0  = new GridBagConstraints();
		c0.fill = GridBagConstraints.HORIZONTAL;
		p0.setBackground(pnlBgColor);
		
		//p1
		p1 = new Panel();
		p1.setLayout(new GridBagLayout());
		c1  = new GridBagConstraints(); 
		
		
		Button btnNext = new Button("Next Item");
		c0.insets = new Insets(0, 0, 10, 0); 
		c0.gridx = 3;
		c0.gridy = 0;
		p0.add(btnNext, c0);
		
		btnNext.addActionListener(
			new ActionListener() {
				public void actionPerformed(ActionEvent e){
					index++;	
					data = getData(index); 
					no_of_rec = data.length;
					
					p1.removeAll();	
					addDataPanel(p1, c1);	
					display(data);	
					
					p1.invalidate();	
					p1.validate();	
					p1.repaint(); 
					
				}			
		});
		
		//call a method to add data row(s)
		addDataPanel(p1, c1);
		
		//add p0 and p1 to pMain;
		c.gridx = 0;
		c.gridy = 0;
		pMain.add(p0, c);
		
		c.gridx = 0;
		c.gridy = 1;
		pMain.add(p1, c);
		
		
		//p2
		Panel p2 = new Panel();
		p2.setLayout(new GridBagLayout());
		GridBagConstraints c2  = new GridBagConstraints(); 
		c2.fill = GridBagConstraints.HORIZONTAL;
		p2.setBackground(pnlBgColor);
		
		c.gridx = 0;
		c.gridy = 2;
		pMain.add(p2, c);
	
		display(data);
		
		add(pMain);
		
		this.setBackground(pnlBgColor);

	}//init
	
	private String[] getData(int i){
		
		int n = 0;
		if((i%2) == 0) n= 20;
		else n= 18;
		String[] data = new String[n];
		for(int j=0; j < data.length; j++){
			data[j] = "000000" + String.valueOf(j);
		}
		return data;
	}
	
    private void addDataPanel(Panel p1, GridBagConstraints c1){
		txtDataRowDisplay1 = new TextField[no_of_rec];
		txtDataRowDisplay2 = new TextField[no_of_rec];
		txtDataRowDisplay3 = new TextField[no_of_rec];
		txtDataRowDisplay4 = new TextField[no_of_rec];
		txtDataRowDisplay5 = new TextField[no_of_rec];
		txtDataRowDisplay6 = new TextField[no_of_rec];
		txtDataRowDisplay7 = new TextField[no_of_rec];
		txtDataRowDisplay8 = new TextField[no_of_rec];
		txtDataRowDisplay9 = new TextField[no_of_rec];
		txtDataRowDisplay10 = new TextField[no_of_rec];
		
		//initialize fields
		for(int i = 0; i < no_of_rec; i++){
			txtDataRowDisplay1[i] = new TextField(5);
			txtDataRowDisplay2[i] = new TextField(5);
			txtDataRowDisplay3[i] = new TextField(5);
			txtDataRowDisplay4[i] = new TextField(5);
			txtDataRowDisplay5[i] = new TextField(5);
			txtDataRowDisplay6[i] = new TextField(5);
			txtDataRowDisplay7[i] = new TextField(5);
			txtDataRowDisplay8[i] = new TextField(5);
			txtDataRowDisplay9[i] = new TextField(5);
			txtDataRowDisplay10[i] = new TextField(5);
			
		}
		
		int cnt = 0; 
		for(int m = 0; m < txtDataRowDisplay1.length; m++ ){
			
			c1.gridy = m + cnt;
			
			c1.gridx = 0;
			p1.add(txtDataRowDisplay1[m], c1);
			
			c1.gridx = 1;
			p1.add(txtDataRowDisplay2[m], c1);
			
			c1.gridx = 2;
			p1.add(txtDataRowDisplay3[m], c1);
			
			c1.gridx = 3;
			p1.add(txtDataRowDisplay4[m], c1);
			
			c1.gridx = 4;
			p1.add(txtDataRowDisplay5[m], c1);
			
			c1.gridx = 5;
			p1.add(txtDataRowDisplay6[m], c1);
			
			c1.gridx = 6;
			p1.add(txtDataRowDisplay7[m], c1);
			
			c1.gridx = 7;
			p1.add(txtDataRowDisplay8[m], c1);
			
			c1.gridx = 8;
			p1.add(txtDataRowDisplay9[m], c1);
			
			c1.gridx = 9;
			p1.add(txtDataRowDisplay10[m], c1);
				
			cnt++;
		}
		
    }
	
	private void display(String[] data){
		for(int i = 0; i < data.length; i++){
			txtDataRowDisplay1[i].setText(data[i]);
			txtDataRowDisplay2[i].setText(data[i]);
			txtDataRowDisplay3[i].setText(data[i]);
			txtDataRowDisplay4[i].setText(data[i]);
			txtDataRowDisplay5[i].setText(data[i]);
			txtDataRowDisplay6[i].setText(data[i]);
			txtDataRowDisplay7[i].setText(data[i]);
			txtDataRowDisplay8[i].setText(data[i]);
			txtDataRowDisplay9[i].setText(data[i]);
			txtDataRowDisplay10[i].setText(data[i]);
			
		}
	}
	
}

Repainting is done when I click the "Next Item" button.

Previous Topic

Next Topic


	Web Artima.com