I am having a simple problem I guess, that u should know how to solve..
I am trying to do this:
I have a JFrame.
Then I create a JPanel and set his layout to GridLayout(5,5)
Finnaly I add this JPanel to the Container of my JFrame.
When I try to get the width of my panel it shouldnt give me 0 right?
I do this: System.out.println(mypanel.getSize().getWidth()); and it says that is zero :c
why ??
I wanna know the size so I can divide per 5 and know how much to paint for each label, this will be a grid of labels..
Thanks alot in advance...
public janela(){
window = new JFrame("teste");
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
window.setSize(300,300);
contentor = window.getContentPane();
interior = new JPanel();
interior.setLayout(new GridLayout(5,5));
contentor.add(interior);
System.out.println(interior.getSize().getWidth()); //it says 0 ?!?! why??
}
thanks alot in advance guys!!!!
Panels are sized based on their layout. specifically when they are shown and doLayout() is called for you. doLayout() figures out what the appropriate size for your panel is based on the contents of the panel, and the layout manager in force. Since your panel has nothing in it, the appropriate size is 0, 0.
If you will never have anything in the panel, and want to circumvent this (0, 0) size, you can override getPreferredSize() of the panel to return a size that you want the panel to respect for layout.
Related
I want to design my levels on a horizontal pane what i am doing is:
container = new Table(skin);
container.setBounds(0,0,Gdx.graphics.getWidth(),Gdx.graphics.getHeight());
levelselect = new Table(skin);
levelselect.setBounds(0,0,Gdx.graphics.getWidth(),Gdx.graphics.getHeight());
// list = new List(skin,"1");
scrollPane = new ScrollPane(levelselect);
scrollPane.layout();
levelselect.align(Align.left);
for(int i=1;i<20;i++){
levelnumber = new Label(" "+i,levelnumbertext);
levelselect.add(levelnumber);
}
container.align(Align.bottom);
container.add(scrollPane).width(400).height(400);
container.add(levelselect);
any suggestions?? thanks in advance.
Using a ScrollPane and Table for this sounds like a lot of unnecessary overhead, they have a lot going on in the background, dynamically calculating their own layouts etc, you might not need this if you just want a full screen side scroller. You might be best just positioning your Actors on the Stage, however far along they need to be and update the Camera position to suit. Stage has culling options which I think by default are enabled, so it won't be drawing any of your Actors that are off the screen.
I am trying to use some java gui in my matlab code.
I want to create a Jpanel containing lots of buttons , and add this Jpanel to a JscrollPane to be able to scroll up and down, right and left through the Jpanel.
I tried using JavaComponent() function as described in : http://undocumentedmatlab.com/blog/javacomponent
here is my code:
[jpanel1, hpanel1] = javacomponent('javax.swing.JPanel');
[jButton1, hButton1] = javacomponent('javax.swing.JButton');
[jscroll, hscroll] = javacomponent('javax.swing.JScrollPane');
jButton1.setText('Click again!');
set(hButton1,'position',[5 5 50 50])
set(hpanel1,'position',[50 50 500 500],'BackgroundColor','white');
jpanel1.add(jButton1);
jscroll.add(jpanel1);
The panel and button are created but I can't find the scrollpane, tried setting the jscroll to visible with no results.
WHat am I missing out??
You only need to use javacomponent once, to display the outer-most java container, i.e. JScrollPane in your case. Just assemble your components inside JPanel container and then pass that to JScrollPane constructor.
Note that it is safer to create your objects with javaObjectEDT so that subsequent method calls run on EDT - otherwise you could face a deadlock / race condition.
Finally, note how you can use getpixelposition and 'normalized' units for the container created by javacomponent to make your JScrollPane fill the entire parent drawing area, and behave better on resizing.
jButton1 = javaObjectEDT('javax.swing.JButton', 'Button 1');
jButton2 = javaObjectEDT('javax.swing.JButton', 'Button 2');
jPanel = javax.swing.JPanel();
jPanel.add(jButton1);
jPanel.add(jButton2);
jScrollPane = javax.swing.JScrollPane(jPanel);
hFig = figure();
hParent = uicontainer('Parent',hFig);
parentPixelPos = getpixelposition(hParent);
pos = [1,1,parentPixelPos(3),parentPixelPos(4)]; % fill the parent uicontainer completely
[~, hContainer] = javacomponent(jScrollPane, pos, hParent);
set(hContainer, 'Units', 'normalized'); % better behavior on resizing
jscroll.add(jpanel1);
You should never add components to a scroll pane. A JScrollPane has its own custom layout manager to display the scrollbars and the viewport.
So instead you need to add the panel to the viewport:
jscroll.setViewportView( jpanel1 );
However, this may still not work as the following code looks like it is trying to set the size/location of the component which implies a null layout is being used:
set(hButton1,'position',[5 5 50 50])
Normally it is the responsibility of the layout manager to determine the size/location of a component and the scrollbars of the scrollpane will only be displayed is the preferred size of the panel is greater than the size of the scrollpane.
I don't know that the benefit of using MatLab is. I suggest you just use normal Swing. See examples from the Swing tutorial on Using Layout Managers.
I am setting the width of actor in table.add(actor).width(width). The padding is set to 1% of screen width. This is the result I get:
As you can see, spacing between actors is way beyond 1% . I tried using fill() methods but it didn't work. I also tried setFillParent(true) on the actor, no success. What is going on here? This is the complete code. The only spacing between actors should be the one I set with padding. How do I achieve this?
private void createScrollPane(){
texture=new Texture("badlogic.jpg");
ImageButton.ImageButtonStyle fibs=new ImageButton.ImageButtonStyle();
fibs.imageUp=new TextureRegionDrawable(new TextureRegion(texture));
button1= new ImageButton(fibs);
button2= new ImageButton(fibs);
button3= new ImageButton(fibs);
button1.setPosition(0, 0);
button2.setPosition(0, 0);
button3.setPosition(0, 0);
scrollTable=new Table();
scrollTable.setBounds(Gdx.graphics.getWidth()*0.03f,0,Gdx.graphics.getWidth()*0.94f, Gdx.graphics.getHeight());
scrollTable.setPosition(Gdx.graphics.getWidth() * 0.03f, 50);
scrollTable.add(button1).width(Gdx.graphics.getWidth() * 0.3f).padLeft(Gdx.graphics.getWidth() * 0.01f).fill();
scrollTable.add(button2).width(Gdx.graphics.getWidth() * 0.3f).padLeft(Gdx.graphics.getWidth() * 0.01f).padRight(Gdx.graphics.getWidth() * 0.01f).fillX();
scrollTable.add(button3).width(Gdx.graphics.getWidth() * 0.3f).padRight(Gdx.graphics.getWidth() * 0.01f).fill();
stage.addActor(scrollTable);
}
ImageButton is a Button with an Image on top of it. If you just want a button then use the Button class and set the up drawable to the drawable you want it to be. Note that you can enable debug drawing of the stage or table to visualize what is going on.
Your function calls are affecting the Table's cells, not the actors in the cells.
Call scrollTable.setDebug(true) to see the cells, padding, etc. You'll be happy to find your function calls are working, just on the cells rather than their contents.
The next step is to build a composite layout with widgets which allow you to expand the buttons but maintain them in a horizontal alignment. You might be able to accomplish that with just a table if you battle the cells hard enough, I'm not sure.
What I did was to use a Table, then add a HorizontalGroup. The HorizontalGroup goes within a cell on the Table. Inside the HorizontalGroup I add my buttons. Laying out the buttons the way I want within the HorizontalGroup is far easier than doing it via the Table.
For an ImageButton you can explicitly set the minHeight and minWidth of the style, which will forcibly scale the attached Image.
I have this code which I don't understand:
JFrame jframe = new JFrame("Risultati protocolli cercati");
jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel body = new JPanel();
Container c = jframe.getContentPane();
body.setSize(100, 100);
body.setLayout(new GridLayout(1000, 1));
for (int i = 0; i < 1000; i++)
body.add(new JLabel("JLabel " + i));
JScrollPane jsp = new JScrollPane(body);
c.add(jsp);
jframe.setSize(100, 100);
//jframe.add(body);
jframe.setVisible(true);
If I leave the penultimate line commented then everything appears, both labels and scroll. Instead if I uncomment that line, I see nothing. Only the JFrame. Why does it happens? For the main window of my program I had to perform jframe.add(body)...
Instead if I uncomment that line, I see nothing. Why does it happens?
The below line
jframe.add(body);
internally calls
jframe.getContentPane().add(body);
JFrame by default uses BorderLayout and add(component) method directly add it in the center section, if you add again then last one is replaced with latest one.
You can use overloaded add() method of JFrame to add it in another section east, west, north and south as shown in below snapshot:
for e.g.:
frame.add(comp,BorderLayout.NORTH); // add in north section
frame.add(comp,BorderLayout.WEST); // add in west section
You can use other Layout Managers as well as per the design or your application:
It's worth reading How to Use BorderLayout
One more suggestion:
Use frame.pack() instead of frame.setSize() that fits the components as per component's preferred size.
Interesting problem caused by the layout managers.
A component can only have a single parent. First you add the "body" to the scrollpane but then the "body" gets removed from the scrollpane when you add it to the content pane of the frame (for the reasons mentioned by #braj). Not a big deal as it just means you won't see any scrollbars.
Since the component is directly added to the content pane you should still see the labels however they do not display and this is the confusing part. Change your code to use "100" for the GridLayout and the number of components you create in the loop. When the frame first displays the panel will be empty. Now, increase the height of the frame and you will see the components appear. What is happening is that you are trying to paint too many components in a small area and because of rounding issues the height of every component becomes 0, so there is nothing to paint. When you increase the height to at least 100 pixels every component can now be 1 pixel high so you get garbage.
The only solution is to keep the "body" panel in the scrollpane so that all components will be displayed at their preferred size. Then you can scroll through all the components as required.
A tip for when using a GridLayou. You can use:
body.setLayout(new GridLayout(0, 1));
Then means the grid will have unlimited rows and a single column.
I wrote a simple gui with DesignGridLayout as layout manager.
I have a 2 JTextFields, beneath them a JScrollPane containing a JTextArea, and right under it I have a button.
Upon maximizing the JFrame, everything is stretching out nicely to fill the screen.
The problem starts when I try to restore the Frame to it's original size. the JScrollFrame Vertical size remains too large, and the Button is not shown, since it is covered by the too big Jscrollpane.
The problem is the same for manual resizing. The JScrollPane sets a new value for it's vertical size according to how much I stretch it.
I tried overriding the getScrollableTracksViewportHeight() method from Scrollable interface, but it had no affect. In addition, I had this entire setting inside a Jpanel which I removed, but it's still the same.
Any insights would be appreciated.
edit: added samples of code.
This code creates most of the Gui:
DesignGridLayout layout = new DesignGridLayout(frame);
layout.row().grid().empty().add(new JLabel("someText1"), someText1);
layout.row().grid().empty().add(new JLabel("someText2"), someText2);
layout.emptyRow();
layout.row().grid().add(new JSeparator());
layout.row().grid().empty().add(titleLabel).empty();
layout.row().grid().add(textarea("",5,6));
layout.row().grid().empty().add(button).empty();
This code creates The JScrollPane:
private JScrollPane textarea(String content, int rows, int columns)
{
JTextArea textArea = new JTextArea(rows, columns);
JScrollPane scrollPane = new JScrollPane(textArea);
return scrollPane;
}