Guys, I need to put some buttons in a jscrollpanel, but the JScrollPane won't create a scroll vertically. I'm using a JPanel inside the JScrollPane which is using the simple FlowLayout layout. How can I make the JScrollPanel to scroll only in the vertical??
Problem:
Desired Solution:
Check out the Wrap Layout
The fact you use a JScrollPane changes quite a few things concerning the internal FlowLayout. indeed, when the FlowLayout tries to layout contained JButtons, it use for that the available space. In your case, you don't have limits to the space in the "scrollable client" of your JScrollPane. As a consequence, considering your FlowLayout has infinite space, it uses this space to display items according to it.
So the solution would be to change your scrollable client in order to limit its viewable area to the same than your JScrollPane's JViewport.
However, you would not even in this case have your line returns, as FlowLayout don't really well handle this case.
Were I to be you, I would of course choose an other layout. As GridLayout don't really well handles borders, i think the only reasonible standard layout you can use is GridBagLayout, althgough I fear your dynamic content constraints may require you something even more customizable.
JTextArea c = new JTextArea();
c.setLineWrap(true);
c.setWrapStyleWord(false);
This will wrap anything in a text area to the next line without creating a Horizontal Scroll.
Use the modified Flow Layout that I posted in this answer: How can I let JToolBars wrap to the next line (FlowLayout) without them being hidden ty the JPanel below them?
It will wrap to the next line and your scrollbar should scroll vertically.
scrollbar = new Scrollbar(Scrollbar.VERTICAL);
Or you could use a JList.
See this site for more info: http://docs.oracle.com/javase/tutorial/uiswing/components/list.html
the example class: ListDialog uses only a vertical scrollbar, when the window is resized or the elements don't fit the view.
Related
I have a JTextPane with HTML text.
I used GroupLayout (using WindowBuilder).
I've set the minimum size of my JFrame to 800x600 so the user cannot make it smaller than that.
The app has a big scrolling JPanel the size of the entire window. The top part of the panel is taken up by a JTextPane wrapped in JScrollPane. I have disabled the scroll bars and sized the JScrollPane to make the entire text visible.
In group layout the JScrollPane is set to stay constant vertically, but size horizontally.
My issue is that when the user makes the window larger the JScrollPane also expands, but now there is a big white space left at the bottom of the text pane. Is there a way that I can make JTextPane shrink to fit its contents.
Also if you suggest a different layout, I would be willing to try it.
I used this TextPanePerfectSize example from #camickr to solve a similar problem. The example uses validate() and pack() to adjust to the preferred size. You might be able to adapt it to your situation.
Take a look at SpringLayout. It gives you far more control over the positioning of components. Look at the SpringLayout tutorial if you get stuck.
The trick in your case is to bind the bottom (south) of your JScrollPane to the top (north) of the screen.
I'm fairly new to Java and I'm trying to create a GUI application with some labels, buttons, and textfields. The program is pretty simple and I just wanted to use a default layout, which is FlowLayout. I managed to place and size everything fine, but the only thing seem to be not working is the alignment. I want to place buttons and textfields with certain alignments, but whenever I set an alignment, it moves the text inside of whatever the object rather than the object itself. For example, I wrote:
button.setHorizontalAlignment(JButton.RIGHT);
but it seems like it aligns the text inside the button instead of the button itself.
Is there any way to align the button itself rather than the text inside of it?
I know the alignment stuff could be easier with some other type of layout (e.g. BoxLayout), but I just want to use the FlowLayout for this one, unless it is impossible to align them using the FlowLayout (which I don't think so).
Thanks in advance.
See the constructor FlowLayout(int align).
Constructs a new FlowLayout with the specified alignment and a default 5-unit horizontal and vertical gap. The value of the alignment argument must be one of FlowLayout.LEFT, FlowLayout.RIGHT, FlowLayout.CENTER, FlowLayout.LEADING, or FlowLayout.TRAILING.
It seems you are after a FlowLayout.RIGHT as seen in this answer (the combo and check box at the top).
I don't think you can do this with a FlowLayout alone.
My suggestions would be:
Consider switching to MigLayout which is a much more powerful layout mechanism. MigLayout basically lets you position you components within a flexible grid, and you can set the specific alignment of a component within each grid cell.
When you want alignment of subcomponents, it also often makes sense to put them inside a nested JPanel. You can then use a separate layout for this JPanel (BorderLayout perhaps?) which will enable you to get the exact alignment that you want.
setHorizontalAlignment of AbstractButton sets the horizontal alignment of the icon and text not the position of the button. AbstractButton's default is SwingConstants.CENTER.
If you want to align the button..set the position while adding it to the panel or frame..something like this....
p.add(button, BorderLayout.SOUTH);//using `BorderLayout`
Flow layouts are typically used to arrange buttons in a panel. It will arrange buttons left to right until no more buttons fit on the same line.
On my Java Swing application I have two components. On the left side is a navigation (JList) and on the right side is a JTable. I would like to leave the possibility to increase the size of the window, without increasing the size of both components.
The proportion of 50/50 is kept, through ought the whole sizing. I use GridLayout. Is this behavior rooted into the LayoutManager or is a property which has to be set?
GridbagLayout will allow you to achieve this. However, have you also considered using a JSplitPane where the left-hand side contains your navigation panel and the right hand side contains the table? You could configure it so that all additional space is allocated to the right hand side by calling setResizeWeight(0.0). However, you still retain the flexibility of allowing the user to manually resize the navigation area if required. You also have the option to hide your navigation panel completely by calling setOneTouchExpandable(true) on the split pane.
From what I know the GridLayout manager resizes all cells to the same size. Knowing this you might use it anyway just add the component you want to stay unchanged to a panel and then add this panel to a cell instead.
Or use a different layout manager mine favourite is TableLayout, where you can set which columns/rows should fill the empty space where the rest will stay in their preferred size.
Good luck, Boro
Suggestion: Don't us GridLayout. Instead use other layouts such Borderlayout or GridBagLayout or a combination of layouts. For instance if you used BorderLayout, you could but the JTable BorderLayout.CENTER and the JList in one of the other positions. Or if you use GridBagLayout, then by setting your GridBagConstraint weightx and weighty values correctly and the fill values (only you know what you currently desire), would allow selective enlargement of the components added to the container.
I have a JPanel identified by myPanel. I create a series of JButtons, and add() them to myPanel. At the end of my generating-and-adding loop, I call myPanel.validate(). The buttons show up.
The problem is the size of the panel is affected. No matter what Layout Manager I choose, the buttons are always added on the same line (even though there is more space beneath them).
I have tried setting myPanel's maximum size and setting its size after every add(). No matter what I do, after that validate(), the panel is blown up and my application's GUI is screwed.
Any ideas?
I create a series of JButtons, and add() them to myPanel... the buttons are always added on the same line (even though there is more space beneath them).
None of the default layout managers provide automatic wrapping. You need to specify how you want wrapping to occur. A GridLayout or a GridBagLayout can be used in these cases.
Or you can try the Wrap Layout which was written for this purpose.
i would firstly set a preferred size on the jpanel:
myPanel.setPreferredSize(new Dimension(X, Y));
this will tell your layout manager how to try to fit the contents within this dimension.
without seeing your source code, i can't add much more than that.
I'm building a grid filled with labels. One of them contains html-text and should resize to maximum format and be scrollable. I found how to add a JScrollPane but it stays one line height, I just can't find how to resize it even when I give it a size of 400x400 ...
Removing getViewport() gives the same result.
JPanel grid = new JPanel(new GridLayout(1,2));
// first cell of the grid
grid.add(new JLabel("title"));
// second cell of the grid, this should be the scrollable one
JScrollPane scroll = new JScrollPane();
scroll.getViewport().setSize(400, 400);
scroll.getViewport().add(new JLabel("<html>long<br>html<br>text</html>"));
grid.add(scrollVersion, BorderLayout.CENTER);
Any ideas ?
Thanks a lot ...
GridLayout does not respect preferred size of the components which it lays out. It aims to make all grid cells the same size. An alternative is to use GridBagLayout, however I personally would recommend ZoneLayout which (in my opinion) is simpler, just as powerful, and much more intuitive. With the cheatsheet you can't go wrong.
As a side note, BorderLayout.CENTER is a constraint used for BorderLayout and is not compatible with GridLayout. When components are added to the owner of a GridLayout, you need not provide constraints. Components are added left to right starting at the top left corner cell using GridLayout.
Replace your GridLayout with a GridBagLayout. With the correct set of constraints, it should work like a charm. And obviously, take a look at some examples, as GridBagLayout seems quite complex, but is rather simple with some examples.
All cells of the GridLayout are designed to have the same size, so if you want one to be bigger than teh othes you must use another LayoutManager, like the GridBagLayout that Riduel suggest.
Also if your JLabel is going to have more than one line i suggest you to replace it by an uneditable JTextPane o JTextArea