Develop Reference

Getting Each Monitor Inset In Java

Don't mind the use of the Window Insets, but pay more attention to the use of the ScreenInsets, which is saved locally as Insets insets; I print the insets.bottom, and for every monitor the taskbar height shows up, even though the taskbar is only located on the first monitor.
The monitor insets on my second monitor should all be zero, but yet it acts as if the taskbar is located on both monitors. Setting the window to full size in the monitor the window is currently located on works, except it leaves room for the taskbar regardless which monitor are use it in.
From my understanding of the Toolkit.getScreenInsets(GraphicsConfiguration), it should return the correct insets for the specific GraphicsConfiguration you pass in, yet I'm passing in each GraphicsDevice's GraphicsConfiguration and getting the same results back.
JFrame window;
public void setSizeToFullScreen()
{
GraphicsEnvironment ge=GraphicsEnvironment.getLocalGraphicsEnvironment();
GraphicsDevice[] screenDevices=ge.getScreenDevices();
Point p=window.getLocationOnScreen();
for(int i=0;i<screenDevices.length;i++)
{
Rectangle2D b=screenDevices[i].getDefaultConfiguration().getBounds();
if(SMath.getMath().doesRectangleContainPoint(b.getX(), b.getY(), b.getWidth(), b.getHeight(), p.getX(),p.getY()))
{
Insets insets = Toolkit.getDefaultToolkit().getScreenInsets(screenDevices[i].getDefaultConfiguration());
System.out.println("Monitor: "+i+": task bar height: "+insets.bottom);
this.setSize(b.getWidth()+1 -(insets.right+insets.left)-(this.window.getInsets().left+this.window.getInsets().right), b.getHeight()+1-(insets.top+insets.bottom)-(this.window.getInsets().top+this.window.getInsets().bottom));
this.setLocation(b.getX()+insets.left+window.getInsets().left, b.getY()+insets.top+window.getInsets().top);
return;
}
}
}
My question is, in Java, how can we figure out which monitor actually has the taskbar, or the better question, how can we get the correct monitor insets for each monitor in Java.

Re: "..., yet it acts as if the taskbar is located on both monitors".
I found the following:
Referring to Windows->Control Panel->Appearance and Personalization->
Display->Screen Resolution:
When gs[0] (= the display shown with a "1" inside a circle in the Control Panel window above) has the Toolbar, the reported Insets are correct.
I.e., they are reported to be = 0 for the no-Toolbar screen and = 49 for the screen that has the Toolbar.
When any other gs[x] has the Toolbar, the reported Insets are wrong :-(. I.e., they are reported to be = 49 for all screens.
In my application, I want "JDialog dialog0" to always appear 500 to the right of the lower-left corner of my "big" display, and "JFrame frameBalloonHerderGui" to always appear in the upper-left corner of my "small" display.
I want the JDialog to have a fixed size in the lower-left corner of my "big" display, and the JFrame should pretty much fill the "small" display it's in.
I did give the graphicsConfiguration for the display I wanted each JDialog/JFrame to appear in to their constructors. Alas, that is not enough to allow the Insets to be correct.
To accomplish the positioning above, I wrote a function that I call for my JDialog and JFrame as follows:
// I'll omit the creation of the grapicsConfiguration for now.
JDialog dialog0 = new JDialog( gc);
ScreenAndTaskBarHeights h = getThisComponentsScreensTaskBarHeight( dialog0);
final int myWidth = 1170;
final int myHeight = 800;
final int myScreenXInset = 500;
final int myScreenYInset = 10;
dialog0.setBounds(
h.screenOriginX + myScreenXInset,
h.screenOriginY + h.screenHeight - myHeight - h.taskBarHeight - myScreenYInset,
myWidth, myHeight);
dialog0.setVisible( true);
// I'll omit the creation of the grapicsConfiguration for now.
JFrame frameBalloonHerderGui = new JFrame( gc);
ScreenAndTaskBarHeights h =
getThisComponentsScreensTaskBarHeight( frameBalloonHerderGui);
final int myWidth = 1695;
final int myScreenInset = 10;
frameBalloonHerderGui.setBounds(
h.screenOriginX + myScreenInset,
h.screenOriginY + myScreenInset,
myWidth, h.screenHeight - (myScreenInset * 2) - h.taskBarHeight);
frameBalloonHerderGui.setVisible( true);
The workaround I found is that the screenSize.x & .y = (0,0) for the display that has the TaskBar, and some big positive or negative numbers for the other displays.
The function below successfully implements this workaround. I also made a simple class so I could pass multiple values back to the caller as shown above.
// Add additional data members here to your liking.
static class ScreenAndTaskBarHeights
{
int screenOriginX = -1;
int screenOriginY = -1;
int screenHeight = -1;
int taskBarHeight = -1;
ScreenAndTaskBarHeights()
{
}
void setValues(
int newScreenOriginX, int newScreenOriginY,
int newScreenHeight, int newTaskBarHeight)
{
screenOriginX = newScreenOriginX;
screenOriginY = newScreenOriginY;
screenHeight = newScreenHeight;
taskBarHeight = newTaskBarHeight;
}
}
static ScreenAndTaskBarHeights
getThisComponentsScreensTaskBarHeight( Component c)
{
ScreenAndTaskBarHeights screenAndTaskBarHeights =
new ScreenAndTaskBarHeights();
GraphicsConfiguration gc = c.getGraphicsConfiguration();
Insets scnMax = Toolkit.getDefaultToolkit().getScreenInsets( gc);
// This should be the TaskBar height specific to the gc that we
// passed in, but it's not :-(.
//
// int taskBarHeight = scnMax.bottom;
//
// However, this seems to be a successful workaround:
//
Rectangle screenSize = gc.getBounds();
boolean thisScreenHasTheToolbar =
(screenSize.x == 0 && screenSize.y == 0);
// Change scnMax.bottom to catch wherever you're worried that the
// TaskBar may be lurking.
//
screenAndTaskBarHeights.setValues(
screenSize.x, screenSize.y, screenSize.height,
(thisScreenHasTheToolbar) ? scnMax.bottom : 0);
return screenAndTaskBarHeights;
}

How do I use text fields to set an ellipse's dimensions?

The project I am working on requires a text field for the user to enter the width of an ellipse. When the user clicks somewhere on a panel, it draws an ellipse with the specified width. When I ran it, the width never changed.
This is in initialize():
tTextWidth = new JTextField();
tTextWidth.setBounds(42, 457, 86, 20);
frame.getContentPane().add(tTextWidth);
tTextWidth.setColumns(10);JButton tSetWidth = new JButton("Set Width");
tSetWidth.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
SetTextToWidth(tTextWidth.getText());
}
});
This is right after initialize():
public void SetTextToWidth(String tWidth)
{
if(tWidth == null)
{
tWidth = "50";
}
int tIntWidth = Integer.parseInt(tWidth);
if(tIntWidth == 0)
{
tIntWidth = 50;
}
RoundSprite tSpriteWidth = new RoundSprite();
tSpriteWidth.SetSpriteWidth(tIntWidth);
}
This is in the class RoundSprite:
private float mX;
private float mY;
int mWidth;
int mHeight;
Color mColor;
void DrawSprite(Graphics2D g2)
{
AffineTransform tOldTransform = g2.getTransform();
g2.setColor(mColor);
g2.translate(mX, mY);
g2.draw(new Ellipse2D.Double(0, 0, mWidth, mHeight));
g2.setTransform(tOldTransform);
g2.translate(mX - (mWidth / 2), mY - (mHeight / 2));
}
public void SetSpriteWidth(int tWidth)
{
mWidth = tWidth;
}

So two main things...
One...
ActionListener will only be triggered when the user presses the action key for the platform, in most cases the Enter key, just so you know ;)
Two...
In your SetTextToWidth is creating a new instance of RoundSprite which has no context to what is been displayed on the screen...
I you thinking, this would mean that ALL instances RoundSprite should be changed, which is not what you want.
As discussed in this simular question, you first need to define which sprite you are actually trying to change and then apply the change you want to that specific instance (and repaint the output)...
Side Notes
You might like to have a read through Code Conventions for the Java TM Programming Language, it will make it easier for people to read your code and for you to read others

Java .drawImage : How do I "unDraw" or delete a image?

I need a certain image to be redrawn at different locations constantly as the program runs. So I set up a while loop that should move an image across the screen, but it just redraws the image on top of itself over and over again. What am I doing wrong? Is there a way to delete the old image before drawing it in a new location?
JFrame frame = buildFrame();
final BufferedImage image = ImageIO.read(new File("BeachRoad_double_size.png"));
JPanel pane = new JPanel() {
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
int num = 0;
boolean fluff = true;
while (fluff == true) {
num = num + 1;
g.drawImage(image, num, 0, null);
if (num == 105) {
fluff = false;
}
}
}
};
frame.add(pane);

You can't code a loop in the paintComponent() method. The code will execute so fast that the image will only be painted in the final position, which in your case should be with an x position of 105.
Instead you need to use a Swing Timer to schedule the animation every 100 milliseconds or so. Then when the timer fires you update the x position and invoke repaint() on the panel. Read the Swing tutorial on Using Swing Timers for more information.

Putting a while loop inside a paintComponent method is not the way to do it. Instead, there should be some setup like the following:
...
final int num = 0;
final JPanel pane;
Timer timer = new Timer(10, new ActionListener() {
public void actionPerformed(ActionEvent e) {
num++;
pane.repaint();
}
});
pane = new JPanel() {
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.drawImage(image, num, 0, null);
}
});
timer.start();
This will move the image ever 10 milliseconds, as specified in the Timer constructor.

This is a common issue people starting out in animation have, as I did. You can't 'remove an image' from the screen. However, you can repaint the entire screen, then redraw your image at a new location.
In psuedocode:
while (condition)
background(white); //or whatever color your background is
drawImage(x,y);
The code above clears the screen so it's safe for you to redraw your image. This effectively 'deletes' your image.
Edit: I didn't read your code, I just addressed your question. So other answers that fix your code are probably better than mine.

Jobjects on top of existing object

so I would like to know if it's possible to put things like buttons, text boxes, words, progress bars, ect, ect, on top of an already existing, in this example, JLabel.
Here is the image of the undercoated frame I made, followed by the snippet of code that is associated with this undercoated frame.
(I dont have 10 reputation, so here is a link to a photo)
http://prntscr.com/15516f
Map.setTitle("Map");
Map.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Map.setUndecorated(true);
Map.setBackground(new Color(0,0,0,0));
Map.setLayout(new FlowLayout());
JLabel Background = new JLabel(new ImageIcon(getClass().getResource("Map.png")));
Background.addMouseListener(new MouseAdapter() {
public void mousePressed(MouseEvent e) {
initialClick = e.getPoint();
getComponentAt(initialClick);
}
});
Background.addMouseMotionListener(new MouseMotionAdapter() {
#Override
public void mouseDragged(MouseEvent e) {
// get location of Window
int thisX = Map.getLocation().x;
int thisY = Map.getLocation().y;
// Determine how much the mouse moved since the initial click
int xMoved = (thisX + e.getX()) - (thisX + initialClick.x);
int yMoved = (thisY + e.getY()) - (thisY + initialClick.y);
// Move window to this position
int X = thisX + xMoved;
int Y = thisY + yMoved;
Map.setLocation(X, Y);
}
});
Map.add(Background);
Map.setSize(507,512);
Map.setLocation(0, 100);
Map.setResizable(false);
Map.setVisible(false);
on a side note, and I KNOW this is FlowLayout(), but when I try to add something else, it'll just put itself above, or below my map.
I'd just like to know if I could put things on top of this Map.
Maybe I should put the image in in another way besides the JLabel?

Look into JLayeredPane and similar strategies. See How to Use Layered Panes for more details.

How to repaint out of focus dialog without gaining its focus?

I made some menu and it is to update conmmon variables (for text on grid) then the out-of-focus dialog must repaint the grid. Here is the screenshot:
The main control panel is always at top position and 'Data Display' panel is always sitting behind it. When press a button on front panel, Data Display must update its grid. Currently, the common variable 0.4 on the grid is updated by adding listener and works fine. But the grid itself is not repainting anymore. How can I repaint the out-of-focus dialog in real time?
Here is the code of the front panel:
public class MainDisplayForm extends javax.swing.JFrame {
Storage st = new Storage();
DisplayForm dF = new DisplayForm();
....
public MainDisplayForm() {
initComponents();
Btn_IncreaseGain.addActionListener(new ButtonListener_IncreaseGain());
}
....
} //MainDisplayForm ends here.
class ButtonListener_IncreaseGain implements ActionListener {
DisplayForm dF = new DisplayForm();
Storage st = new Storage();
ButtonListener_IncreaseGain()
{
}
public void actionPerformed(ActionEvent e) {
st.iGain = 20;
dF.revalidate();
dF.repaint();
System.out.println("Testing");
}
}//Listener ends here.
Here is code of Data Display:
public void paint(Graphics g)
{
g2 = (Graphics2D) g;
paintComponents(g2);
//added numbers are for adjustment.
int x = this.jPanel1.getX()+8;
int y = this.jPanel1.getY()+30;
int width = this.jPanel1.getWidth()+19;
int height = this.jPanel1.getHeight()+40;
//labelling voltages
label0.setText(st.zero);
label1.setText(st.v1);
label2.setText(st.v2);
label3.setText(st.v3);
label4.setText(st.v4);
label5.setText(st.v3);
label6.setText(st.v4);
g2.setColor(Color.darkGray);
for(int i=x; i<width; i=i+80)
{
g2.drawLine(i, y, i, height);
}
int j = 0;
for(int i=y; i<height; i=i+80)
{
j++;
//st.iGain
g2.setColor(Color.orange);
if(j==1)
{
double k1 = st.iGain * 0.4;
st.v1 = Double.toString(k1);
g2.drawString(st.v1, x+5, y+10);
}
if(j==2)
{
double k2 = st.iGain * 0.3;
st.v2 = Double.toString(k2);
g2.drawString(st.v2, x+5, y+90);
}
g2.setColor(Color.DARK_GRAY);
g2.drawLine(x, i, width, i);
....
} //grid info is not completed yet.
Thanks,

Focus isn't the issue and has nothing to do with your current problem. The solution is to change the properties of the data grid by updating fields it contains via setter methods and calling repaint on the JComponent (perhaps a JPanel, or some other component that derives ultimately from JComponent) held by the data grid. The paintComponent method of this component should use its class fields to update what it draws.
You almost never paint in the paint method of a JComponent and certainly you don't want to draw directly into a top-level window. You also probably don't want to set text of JLabels, JTextFields, or any other JTextComponent. from within paint/paintComponent.
I can't see why your code is not working and can only guess that the likely cause of your problem is in code not shown.
Edit 1:
Just guessing, but you may have a problem of references. I notice that your listener class creates new DisplayForm and Storage objects:
DisplayForm dF = new DisplayForm();
Storage st = new Storage();
There's a good possibility that these objects are not the ones being displayed, especially if you create these objects elsewhere and display them. Again I'm just guessing since I don't see the rest of your code, but perhaps you should to pass references for these objects into the DisplayForm via constructor or setter method parameters.
Edit 2:
e.g.,
public void setDisplayForm(DisplayForm dF) {
this.dF = dF;
}
// same for Storage
And in the main program:
public MainDisplayForm() {
initComponents();
ButtonListener_IncreaseGain btnListenerIncreaseGain = new ButtonListener_IncreaseGain();
btnListenerIncreaseGain.setDisplayForm(....);
btnListenerIncreaseGain.setStorage(....);
Btn_IncreaseGain.addActionListener(btnListenerIncreaseGain);
}