javaswingjframejpanelgridbaglayout
(Gridbag Layout) Graphic component is clipping into another grid, not sure why
This is the intended design of my JFrame:
It looks easy enough to implement, has some buttons, textfields, lables, and a selection list.
It also has that yellow box in the upper left called a "graphic". I'm not too familiar on how to use though.
In order to make something similar to above, I wanted to use a gridbag layout.
This is what I was able to produce before running into issues:
The label red:, the textbox and the -/+ buttons are all on col 1 (gridy = 1;).
When I added my graphic on row 0 col 0 (with gridwidth = 4), I expected it to go above those elements (because 0 is less than 1). Sadly thats not what I got, and its frustrating because I dont know why its doing this.
My result:
Like I said earlier, I don't have that much experience with JFrames. I would really appreciate someone's experience and help with fixing this and an explanation on why.
Here is my source code:
(1/2):
package colorSamplerApp;
import java.awt.*;
import javax.swing.*;
public class WindowApplication extends JFrame {
final static boolean shouldFill = true;
final static boolean shouldWeightX = true;
final static boolean RIGHT_TO_LEFT = false;
protected static JLabel redLabel;
protected static JLabel greenLabel;
protected static JLabel blueLabel;
protected static JTextField redTextField;
protected static JTextField greenTextField;
protected static JTextField blueTextField;
protected static JButton redButtonM;
protected static JButton greenButtonM;
protected static JButton blueButtonM;
protected static JButton redButtonP;
protected static JButton greenButtonP;
protected static JButton blueButtonP;
protected static JButton saveButton;
protected static JButton resetButton;
protected static JList listColors;
protected static DrawingTester drawTest;
public static void addComponentsToPane(Container pane)
{
if (RIGHT_TO_LEFT) {
pane.setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);
}
pane.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
if (shouldFill) {
//natural height, maximum width
c.fill = GridBagConstraints.HORIZONTAL;
}
/**
* Setup the RGB Labels
*
* R <0,1>
* G <0,2>
* B <0,3>
*
*/
c.insets = new Insets(0,10,0,5);
c.gridwidth = 1;
redLabel = new JLabel("Red:");
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 0;
c.gridy = 1;
pane.add(redLabel, c);
greenLabel = new JLabel("Green:");
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 0;
c.gridy = 2;
pane.add(greenLabel, c);
blueLabel = new JLabel("Blue:");
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 0;
c.gridy = 3;
pane.add(blueLabel, c);
/**
* Setup the RGB Text Fields
*
* R<1,1>
* G<1,2>
* B<1,3>
*
*/
c.insets.set(0, 0, 0, 5);
redTextField = new JTextField("255");
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 1;
c.gridy = 1;
pane.add(redTextField, c);
greenTextField = new JTextField("0");
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 1;
c.gridy = 2;
pane.add(greenTextField, c);
blueTextField = new JTextField("0");
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 1;
c.gridy = 3;
pane.add(blueTextField, c);
/**
* Setup the RGB (-) Button Fields
*
* R<2,1>
* G<2,2>
* B<2,3>
*
*/
c.insets.set(5,5,0,10);
redButtonM = new JButton("-");
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 2;
c.gridy = 1;
pane.add(redButtonM, c);
greenButtonM = new JButton("-");
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 2;
c.gridy = 2;
pane.add(greenButtonM, c);
blueButtonM = new JButton("-");
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 2;
c.gridy = 3;
pane.add(blueButtonM, c);
/**
* Setup the RGB (+) Button Fields
*
* R<3,1>
* G<3,2>
* B<3,3>
*
*/
c.insets.set(5,0,0,10);
redButtonP = new JButton("+");
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 3;
c.gridy = 1;
pane.add(redButtonP, c);
greenButtonP = new JButton("+");
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 3;
c.gridy = 2;
pane.add(greenButtonP, c);
blueButtonP = new JButton("+");
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 3;
c.gridy = 3;
pane.add(blueButtonP, c);
/**
* Setup the Save/Reset Buttons
*
* save <0,4>
* reset<1,4>
*
*/
c.insets.set(10,10,10,5);
saveButton = new JButton("Save");
c.fill = GridBagConstraints.HORIZONTAL;
c.ipady = 10; //make this component tall
c.ipadx = 10;
//c.weightx = 0.0;
c.gridwidth = 2;
c.gridx = 0;
c.gridy = 4;
pane.add(saveButton, c);
c.insets.set(10,5,10,10);
resetButton = new JButton("Reset");
c.fill = GridBagConstraints.HORIZONTAL;
c.ipady = 10;
c.ipadx = 10;
//c.weighty = 1.0; //request any extra vertical space
//c.anchor = GridBagConstraints.PAGE_END; //bottom of space
c.gridx = 2; //aligned with button 2
c.gridwidth = 2; //2 columns wide
c.gridy = 4; //third row
pane.add(resetButton, c);
/**
* Setup the Color Selection List
*
* <4,0>
*
*/
c.insets.set(10,0,10,10);
listColors = new JList();
/**
File reading shenanigans to fill up the list
*/
c.fill = GridBagConstraints.HORIZONTAL;
c.ipady = 150;
c.ipadx = 100;
//c.weighty = 1.0; //request any extra vertical space
//c.anchor = GridBagConstraints.PAGE_END; //bottom of space
c.gridx = 4; //aligned with button 2
c.gridheight = 5; //2 columns wide
c.gridy = 1; //third row
pane.add(listColors, c);
/**
* Setup the Graphics
*
* <0,0>
*
*/
drawTest = new DrawingTester();
c.insets.set(0,0,0,0);
c.gridx = 0; //top leftw
c.gridy = 0; //bottom
c.gridwidth = 0 ;
pane.add(drawTest,c);
}
public static void main (String argv[])
{
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI("Color Sampler");
}
});
}
public static void createAndShowGUI(String title)
{
// Create and setup the window
JFrame frame = new JFrame (title);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// Setup the content pane
addComponentsToPane(frame.getContentPane());
// Display the window
frame.pack();
frame.setVisible(true);
}
}
(2/2)
package colorSamplerApp;
import java.awt.*;
import javax.swing.*;
import javax.swing.JComponent;
public class DrawingTester extends JComponent {
public void paintComponent(Graphics g){
super.paintComponent(g);
g.setColor(Color.red);
g.fillRect(0,0, 170, 70);
}
}
Solution
The problem you're facing is related to reusing the same GridBagConstraints object. Pretty common one and is one of the pains of dealing with this layout.
First of all, I've commented out all the calls that changed the insets.
Then, I've made sure that the gridx and gridy were being set correctly. Also, think of gridheight and gridwidth as the number of cells in the grid your component is going to take, don't think in terms of the actual width and height of the internal component that you're placing in the cell.
In DrawingTester, I've also made sure that we were painting the whole thing.
Check out the code and the result:
import java.awt.*;
import javax.swing.*;
public class WindowApplication extends JFrame {
final static boolean shouldFill = true;
final static boolean shouldWeightX = true;
final static boolean RIGHT_TO_LEFT = false;
protected static JLabel redLabel;
protected static JLabel greenLabel;
protected static JLabel blueLabel;
protected static JTextField redTextField;
protected static JTextField greenTextField;
protected static JTextField blueTextField;
protected static JButton redButtonM;
protected static JButton greenButtonM;
protected static JButton blueButtonM;
protected static JButton redButtonP;
protected static JButton greenButtonP;
protected static JButton blueButtonP;
protected static JButton saveButton;
protected static JButton resetButton;
protected static JList listColors;
protected static DrawingTester drawTest;
public static void addComponentsToPane(Container pane)
{
if (RIGHT_TO_LEFT) {
pane.setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);
}
pane.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
if (shouldFill) {
//natural height, maximum width
c.fill = GridBagConstraints.HORIZONTAL;
}
/**
* Setup the RGB Labels
*
* R <0,1>
* G <0,2>
* B <0,3>
*
*/
// c.insets = new Insets(0,10,0,5);
c.gridwidth = 1;
redLabel = new JLabel("Red:");
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 0;
c.gridy = 1;
pane.add(redLabel, c);
greenLabel = new JLabel("Green:");
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 0;
c.gridy = 2;
pane.add(greenLabel, c);
blueLabel = new JLabel("Blue:");
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 0;
c.gridy = 3;
pane.add(blueLabel, c);
/**
* Setup the RGB Text Fields
*
* R<1,1>
* G<1,2>
* B<1,3>
*
*/
// c.insets.set(0, 0, 0, 5);
redTextField = new JTextField("255");
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 1;
c.gridy = 1;
pane.add(redTextField, c);
greenTextField = new JTextField("0");
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 1;
c.gridy = 2;
pane.add(greenTextField, c);
blueTextField = new JTextField("0");
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 1;
c.gridy = 3;
pane.add(blueTextField, c);
/**
* Setup the RGB (-) Button Fields
*
* R<2,1>
* G<2,2>
* B<2,3>
*
*/
// c.insets.set(5,5,0,10);
redButtonM = new JButton("-");
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 2;
c.gridy = 1;
pane.add(redButtonM, c);
greenButtonM = new JButton("-");
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 2;
c.gridy = 2;
pane.add(greenButtonM, c);
blueButtonM = new JButton("-");
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 2;
c.gridy = 3;
pane.add(blueButtonM, c);
/**
* Setup the RGB (+) Button Fields
*
* R<3,1>
* G<3,2>
* B<3,3>
*
*/
// c.insets.set(5,0,0,10);
redButtonP = new JButton("+");
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 3;
c.gridy = 1;
pane.add(redButtonP, c);
greenButtonP = new JButton("+");
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 3;
c.gridy = 2;
pane.add(greenButtonP, c);
blueButtonP = new JButton("+");
c.fill = GridBagConstraints.HORIZONTAL;
c.gridx = 3;
c.gridy = 3;
pane.add(blueButtonP, c);
/**
* Setup the Save/Reset Buttons
*
* save <0,4>
* reset<1,4>
*
*/
saveButton = new JButton("Save");
c.insets.set(10,10,10,5);
c.fill = GridBagConstraints.HORIZONTAL;
c.ipady = 10; //make this component tall
c.ipadx = 10;
//c.weightx = 0.0;
c.gridwidth = 2;
c.gridx = 0;
c.gridy = 4;
pane.add(saveButton, c);
resetButton = new JButton("Reset");
c.insets.set(10,5,10,10);
c.fill = GridBagConstraints.HORIZONTAL;
c.ipady = 10;
c.ipadx = 10;
//c.weighty = 1.0; //request any extra vertical space
//c.anchor = GridBagConstraints.PAGE_END; //bottom of space
c.gridx = 2; //aligned with button 2
c.gridwidth = 2; //2 columns wide
c.gridy = 4; //third row
pane.add(resetButton, c);
/**
* Setup the Color Selection List
*
* <4,0>
*
*/
c.insets.set(5,5,5,5);
listColors = new JList(new Object[] {"Test 1", "Test 2", "Test 3"});
/**
File reading shenanigans to fill up the list
*/
c.fill = GridBagConstraints.BOTH;
c.gridy = 0;
c.gridx = 4;
c.gridheight = 5;
c.gridwidth = 1;
pane.add(listColors, c);
/**
* Setup the Graphics
*
* <0,0>
*
*/
drawTest = new DrawingTester();
c.insets = new Insets(5,5,5,5);
c.fill = GridBagConstraints.BOTH;
c.gridx = 0; //top leftw
c.gridy = 0; //bottom
c.gridheight = 1;
c.gridwidth = 4;
pane.add(drawTest,c);
}
public static void main (String argv[])
{
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI("Color Sampler");
}
});
}
public static void createAndShowGUI(String title)
{
// Create and setup the window
JFrame frame = new JFrame (title);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// Setup the content pane
addComponentsToPane(frame.getContentPane());
// Display the window
frame.pack();
frame.setVisible(true);
}
}
class DrawingTester extends JComponent {
public void paintComponent(Graphics g){
super.paintComponent(g);
g.setColor(Color.red);
g.fillRect(0,0, g.getClipBounds().width, g.getClipBounds().height);
}
}
Check out the result:
From that point on you should be able to continue altering it to suit your needs, like getting back all the insets and changing the height and width of the components. Keep in mind that you're reusing the GridBagConstraints, so you have to be careful. If you're unsure, just instantiate a new one and test your code.
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