This is my code:
JTable1.addMouseListener(new MouseAdapter() {
public void mouseReleased(MouseEvent e) {
if (e.getButton() == MouseEvent.BUTTON1)
{
JTable target = (JTable)e.getSource();
Point pMouse = new Point();
pMouse = target.getMousePosition();
}
}
}
So I am retrieving the point (coordinates) relative to the JTable. So let's say the user clicks somewhere in a cell and the returned Point is X=272 and Y=50. So now I want to position a JDialog exactly by those coordinates. I tried:
jDialog1.setLocation(pMouse);
jDialog1.setVisible(true);
But this positions the Dialog somewhere else (the coordinates of the screen instead of the Table). Does somebody have a suggestion on how I can position the JDialog relative to the cell?
You are using the co-ordinates in relation to the client area of the JTable content. You want the global co-ordinates in relation to the entire window. For this you can use:
Point location = MouseInfo.getPointerInfo().getLocation();
jDialog1.setLocation(location);
In general, a user should be able to use your application either by mouse or keyboard. What happens if the user tabs to that cell? Should they not be able to see the same dialog? So for a more general solution that works whether you use a mouse or not:
SwingUtilities.convertPointToScreen(point, table);
Check out the other convertXXX methods in SwingUtilities for future reference.
Or, you can always use:
Component.getLocationOnScreen();
and then add on the mouse point.
Related
I have several JtextPanes and I want to create a method that set the value of a variable to the name of the TextPane which has been clicked because another methond is going to use it. There's also a button that adds a new jTextPane when the user clicks on it and I want those new TextPanes to inherit that method. Or if you know a simpler way to achieve that I'm open to read you. Let me know if you need more information or more code.
static JTextPane focus;
private void redColorActionPerformed(java.awt.event.ActionEvent evt) { //Ths is the method that works with the focus variable. It changes the color of the text in the clicked textpane.
TextEditor.cambiarColor(new java.awt.Color(255, 0, 0), focus);
}
It sound like you want to know the current Swing JTextPane component under the current mouse position? Then try to
Get current Mouse position
Point position = MouseInfo.getPointerInfo().getLocation();
Get the component under the mouse location
Component c = SwingUtilities.getDeepestComponentAt(
the-root-component,
position.getX(),
position.getY()
);
if (c instanceof JTextPane) {
// do your logic
}
I have a JInternalFrame, where I wanted to display a JOptionPane when my JTable was double clicked. I looked around in the internet and found that the only way of doing it was to override mousePressed() method and this is how I did it:
tblJobs.addMouseListener (new MouseAdapter() {
#Override
public void mousePressed (MouseEvent e) {
JTable tbl = (JTable)e.getSource();
int row = tbl.rowAtPoint(e.getPoint());
if (e.getButton() == MouseEvent.BUTTON1 && row != -1) {
if (e.getClickCount() == 2) {
JOptionPane.showMessageDialog(null, "Double click detected");
}
}
}
});
The thing is, I also have a button to hide the frame, and when the frame was hidden and re-shown, I found that upon double clicking my JTable, the JOptionPane got displayed twice. The number of times the JOptionPane got displayed seemed to increase along with the number of times I hid and show the frame. My guess is, the mouseListener got called again and again when I hide and re-show my frame. Is there a way of removing the mouseListener that was added in this way? Or is there another way to stop the JOptionPane from displaying more than once? And also, if what my code was stupid in any way, feel free to tell me! :) Thanks in advance!
How about setting a Boolean calss variable hidden = true when you hide, hidden = false when you unhide ?
Set the first line in mousePressed() to if(hidden) return;
I am a bit confused regarding a situation I have. I created a ListModel extending DefaultListModel and ListRenderer implementing ListCellRenderer for displaying a custom cell in a JList. The cells are some objects created from a class extending JPanel, that contain a JLabel and a JButton.
My issue is related to the mouse events: I want to trigger a certain event when clicking on the JButton inside a cell of the JList, yet I can not figure out how to match the mouse source point to that of the JButton from the respective index. More exactly, I added a mouse listener to the list, but I want it to trigger something if the mouse point is located inside the bounds of the JButton, and another action if it's on the data item. I added some prints to find out the cause of this, but before that some code to highlight the structure:
public WifiGuiHandler(JButton reference) {
btnReference = reference;
wifiListener = new WifiListener();
wifiPopupContainer = new JScrollPopupMenu("Connections.");
wifiPopupContainer.setMaximumVisibleRows(7);
connectionsHolder = new ArrayList<>();
listOfConnections = new JList();
listOfConnectionsModel = new ListModel(connectionsHolder);
listOfConnectionsRenderer = new ListRenderer();
listOfConnections.setModel(listOfConnectionsModel);
listOfConnections.setCellRenderer(listOfConnectionsRenderer);
wifiPopupContainer.add(listOfConnections);
wifiPopupContainer.pack();
initializeTestVariables();
initializeListeners();
}
Here, the constructor for the class that takes a JButton and adds a mouse listener to it, that triggers the appearance of a JPopupMenu, which has only one component, the JList that hold the entire data. Also, links the ArrayList with the data items to the ListModel.
public void initializeTestVariables() {
for (int i = 0; i <= 10; i++) {
WifiItem item = new WifiItem("Connection number " + i + ".", i);
connectionsHolder.add(item);
}
}
Setting up the data items.
public void initializeListeners() {
listOfConnections.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
int index = listOfConnections.locationToIndex(e.getPoint());
if (index >= 0) {
WifiItem item = (WifiItem) ((ListModel) listOfConnections.getModel()).getElementAt(index);
System.out.println("Button of " + item.getConnectionName() + " is at location :" + item.getButton().getLocation());
System.out.println("Button has the bounds : " + item.getButton().getBounds());
System.out.println("MouseEvent detected on : " + e.getPoint().getLocation());
if (item.getButton().getBounds().contains(e.getPoint())) {
item.connectHere();
}
if (item.getButton().isVisible()) {
System.out.println("Set expanded on : " + item.getConnectionName());
item.setExpandedState(false);
listOfConnectionsModel.fireContentsChanged(item, index, index);
updateGui(false);
} else {
System.out.println("Set expanded on : " + item.getConnectionName());
listOfConnectionsModel.fireContentsChanged(item, index, index);
item.setExpandedState(true);
updateGui(false);
}
}
}
});
btnReference.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
updateGui(true);
}
});
}
And this is where the confusion arises. I correctly get the data item( WifiItem) from the mouse event location/point, but when I click on the JButton of the WifiItem, it doesn't trigger that method, like it doesn't seem to detect that the JButton actually is there. I also set up the prints, and what is strange, the Point for the JButton is always the same, even though it actually is different, and this seems to be the problem. More exactly, from the output of the program:
Button of Connection number 2. is at location :java.awt.Point[x=137,y=33]
Button has the bounds : java.awt.Rectangle[x=137,y=33,width=90,height=26]
MouseEvent detected on : java.awt.Point[x=172,y=125]
Button of Connection number 3. is at location :java.awt.Point[x=137,y=33]
Button has the bounds : java.awt.Rectangle[x=137,y=33,width=90,height=26]
MouseEvent detected on : java.awt.Point[x=172,y=125]
The above mouse events points were actually located on the JButton itself, only it didn't get that. As another strange fact, only if I click the JButton of the FIRST element of the list does it trigger the required mouse action.
Another print revealed that all the JButtons have the same Point and Rectangle, and I don't get it. There are 10 items in the JList, each displayed properly, how can all their JButtons have the same location? I must be missing some key element here. I looked at other posts and tried other recommendations: converting the point with SwingUtilities, removing all the mouse listeners from the JList and adding them to the data items.
To sum it up,the issue is that the list triggers the events for the correct data item in it(meaning, I do get the correct index for the item located there), but if the mouse event happens on the JButton of any data item inside the list, it doesn't trigger the required effect (the point is not withing the bounds of the button, even though it should be).
More exactly, I added a mouse listener for the list, but I want it to trigger something if the mouse point is located inside the bounds of the JButton, and another action if it's on the data item.
An easier solution would be to use a JTable. The data is separated into columns and the JTable has an API to let you know which row/column was selected.
You can use the Table Button Column as your renderer/editor for the button.
Edit:
only if I click the JButton of the FIRST element of the list does it trigger the required mouse action
Sounds like your conversion of the mouse point is off.
, how can all their JButtons have the same location?
Again, the button location is releative to the renderer panel. The panel itself is relative to the row in the JList. So I would guess you need to need the row index and add the height of each of the previous rows to your calculation.
I have a question regarding the callback speed of the mouseDragged message of the MouseMotionListener in Java Swing. This post is sort of related but it's not entirely the same so I started a question of my own.
I'm making a small in-house application with no eye on commercial distribution that is basically a digitalized TCG (Trading Card Game) emulator. For any of you familiar with MtG (Magic the Gathering), you might've heard from such a similar program. I'm trying to create something that looks sort of like this, but less fancy.
My GUI consists of a JFrame with menu and then some panels containing various buttons and labels, but I'll only go over the relevent parts to explain my problem.
In essence, I'm using a vertical split JSplitPane with a JPanel on the left, with in that a JScrollPane with a JList in it, which represents at any time the cards in your hand that you can play. On the right side of the split, I have a JLayeredPane with a background image in the DEFAULT_LAYER (subclass of JPanel that overrides the draw function to add an image) and, on various layers above the PALETTE_LAYER, I display the cards that are in play (gathered in an ArrayList) by means of custom CardPanels (another subclass of JPanel that illustrates a card). The entire JLayeredPane is thus a representation of the table in front of you with all the cards you've already played.
I first started by adding a MouseListener and a MouseMotionListener to the JLayeredPane to pick up events, allowing me to register a mouse press, check if this was above a card, then use the mouse dragged event to move the card around and finally mouse release to place it back . This all works perfectly fine and if I add logging information I can see the mouseDragged callback function is called often, allowing for a visually fast dragging motion without lag.
Today I decided to add functionality to allow the user to drag a card from his hand to the "table" (instead of double clicking on the card in the JList), so I added the appropriate listeners to the JList along with filling in some functions like MousePressed and MouseReleased. On a mouse press, I check what card from the list was clicked, I lock the list, create a custom CardPanel (but don't add it anywhere yet, I just allocate and initiate it!) and set a flag. In mouse dragged, I check if this flag is set. If it is, I check where the cursor is. If it is anywhere above the JLayeredPane, I add the CardPanel to the DRAG_LAYER and set another flag. If this second flag is set in successive calls to mouse dragged, I don't add the panel again but I just change the location. This functionality is practically the same as the one in my previous mouse dragged callback. On mouse release, I unlock the list and add the CardPanel on the correct layer in the JLayeredPane.
Everything is working as intended so I'm pretty sure my code is okay, but there is just one slight issue:
When dragging a card from the list to the layered pane (instead of from the layered pane to the layered pane), I notice the mouseDragged callback is called at a pretty low frequency by the JList (approx 10 times per second), introducing some visually disturbing lag (compared to approx 30 times per second in the first case of dragging).
I'm going to add some code snippets as to clarify my problem but I'm afraid adding all the code to allow you to run it yourself would be serious overkill.
The main question in this post is: does anybody know why the mouseDragged is called faster by one MouseMotionListener than by another MouseMotionListener? The listener to the JLayeredPane component makes fast successive calls, the listener to the JList calls significantly slower.
Note: I'm developing in Netbeans and I'm using the built-in graphical Swing Interface Builder. I'm using a JFrame form as my main class.
public class MyFrame extends JFrame{
...
protected JLayeredPane layeredPane;
protected JList cardsInHandList;
...
...
protected ArrayList<String> cardsInHand;
...
private void attachListeners(){
layeredPane.addMouseListener(new MouseAdapter(){
public void MousePressed(MouseEvent e){
// set a flag, start a drag
}
public void MouseReleased(MouseEvent e){
// unset a flag, stop a drag
}
});
layeredPane.addMouseMotionListener(new MouseMotionAdapter(){
public void MouseDragged(MouseEvent e){
// drag the card around
// gets called a lot!
// actual code:
if (e.getButton() == MouseEvent.BUTTON1) {
if (!dragging) return; // the flag
int x = e.getX() - 10;
int y = e.getY() - 10;
// snap to grid
x /= GRIDX;
x *= GRIDX;
y /= GRIDY;
y *= GRIDY;
// redraw the card at its new location
draggedCard.setLocation(x, y);
}
}
});
cardsInHandList.addMouseListener(new MouseAdapter(){
public void MousePressed(MouseEvent e){
// set a flag, start a drag
}
public void MouseReleased(MouseEvent e){
// unset a flag, stop a drag
}
});
cardsInHandList.addMouseMotionListener(new MouseMotionAdapter(){
public void MouseDragged(MouseEvent evt){
// check cursor location, drag if within bounds of layeredPane
// gets called a whole lot less!! _Why?_
// actual code:
if (!draggingFromHand) return; // the flag
// check location of cursor with own method (contains() didn't work for me)
if (isCursorAtPointAboveLayeredPane(evt.getLocationOnScreen())) {
// calculate where and snap to grid
int x = (int) (evt.getLocationOnScreen().getX() - layeredPane.getLocationOnScreen().getX())-10;
int y = (int) (evt.getLocationOnScreen().getY() - layeredPane.getLocationOnScreen().getY())-10;
// snap to grid
x /= GRIDX;
x *= GRIDX;
y /= GRIDY;
y *= GRIDY;
if(!draggingFromHandCardPanelAdded){
layeredPane.add(draggingFromHandCardPanel, JLayeredPane.DRAG_LAYER);
draggingFromHandCardPanelAdded = true;
} else {
draggingFromHandCardPanel.setLocation(x,y);
}
}
}
});
}
I'll try to build a short runnable example reproducing the problem and then attach the code somewhere but right now I got to skoot.
Thanks in advance
PS: I am aware that there is another way to drag in Java, involving TransferHandlers and all that but it just seems like too much hassle and it isn't an actual answer to my question of how come the one callback seems to be called more than the other, so please don't tell me to use that instead.
Once you drag outside the list, Java start generating synthetic mouse events for the list, which might be the cause. See the javadoc for JComponent#setAutoscrolls(boolean).
You might get better results using a global event listener, see
http://tips4java.wordpress.com/2009/08/30/global-event-listeners/
We are using JFreeChart to make XY plots and we have a feature request to do a crosshair that moves along with the mouse and highlights the data point that most closely maps to the x-value of the mouse. You can see a similar example at Google Finance - http://www.google.com/finance?q=INDEXDJX:.DJI,INDEXSP:.INX,INDEXNASDAQ:.IXIC.
Those Google charts only highlight the current value (we want to do that and also show crosshairs), but they show the live mouse interaction we are looking for.
Anyone have any elegant suggestions?
Thanks.
I got this working using a mouse listener and the CrosshairOverlay class. After I get back from holiday travel, I will post my code. It ended up being not too difficult.
Sorry, I forgot about this!
First, you want to calculate the x, y values for where you want your crosshair. For me, I wanted it to move along the points of our line, so I calculated the closest x value and used that data pair for x, y.
Then I call this method:
protected void setCrosshairLocation(double x, Double y) {
Crosshair domainCrosshair;
List domainCrosshairs = crosshairOverlay.getDomainCrosshairs();
if (domainCrosshairs.isEmpty()) {
domainCrosshair = new Crosshair();
domainCrosshair.setPaint(BlueStripeColors.LIGHT_GRAY_C0);
crosshairOverlay.addDomainCrosshair(domainCrosshair);
}
else {
// We only have one at a time
domainCrosshair = (Crosshair) domainCrosshairs.get(0);
}
domainCrosshair.setValue(x);
if (y != null) {
Crosshair rangeCrosshair;
List rangeCrosshairs = crosshairOverlay.getRangeCrosshairs();
if (rangeCrosshairs.isEmpty()) {
rangeCrosshair = new Crosshair();
rangeCrosshair.setPaint(BlueStripeColors.LIGHT_GRAY_C0);
crosshairOverlay.addRangeCrosshair(rangeCrosshair);
}
else {
// We only have one at a time
rangeCrosshair = (Crosshair) rangeCrosshairs.get(0);
}
rangeCrosshair.setValue(y);
}
}
Note that crosshairOverlay is an instance of CrosshairOverlay.
JFreeChart can't render a sub-section of a chart, so you'll want to do something that doesn't require repainting the chart. You could write your chart to a BufferedImage and store that in memory, then have a custom component which uses the buffered chart as the background image, and draws crosshairs and other popup windows over it.
There are methods in JFreeChart to get the data point for a given coordinate on a rendered chart. Don't recall what these are off the top of my head. Depending on your needs, you might consider rendering your own chart data, it's not as hard as you'd think.
The first thing that comes to my mind would be to write a custom Cursor and set it on your chart. It can have a reference to the chart and highlight the x value that's consistent with the Cursor's x/y location.
This worked for me. I set the
chartPanel.addChartMouseListener(new ChartMouseListener() {
public void chartMouseMoved(ChartMouseEvent event)
{
try
{
double[] values = getCrossHairValue(event);
plot.clearRangeMarkers();
plot.clearDomainMarkers();
Marker yMarker = new ValueMarker(values[1]);
yMarker.setPaint(Color.darkGray);
plot.addRangeMarker(yMarker);
Marker xMarker = new ValueMarker(values[0]);
xMarker.setPaint(Color.darkGray);
plot.addDomainMarker(xMarker);
chartPanel.repaint();
} catch (Exception e)
{
}
}
}