I am trying to show a scroll bar next to my text pane but I can't find the reason why it doesn't show.
this.setLayout(null);
editorPane = new JTextPane();
size = editorPane.getPreferredSize();
editorPane.setBounds(17, 12, 533, size.height * 3);
editorPane.setBackground(Color.BLACK);
editorPane.setForeground(Color.WHITE);
//editorPane.setEditable(false);
console = editorPane.getStyledDocument();
scrollConsole = new JScrollPane(editorPane);
scrollConsole.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
this.add(editorPane);
this.add(scrollConsole);
Avoid using null layouts, pixel perfect layouts are an illusion within modern ui design. There are too many factors which affect the individual size of components, none of which you can control. Swing was designed to work with layout managers at the core, discarding these will lead to no end of issues and problems that you will spend more and more time trying to rectify
See Why is it frowned upon to use a null layout in SWING? for more details...
You have two basic mistakes...
You've decided to use a null layout, but neglected to set the size of the JScrollPane
You set the JTextPane as the view for the JScrollPane but then add it to the container, along with the JScrollPane. A component can only belong to a single container, by adding it a second time, you've removed it from the JScrollPane
See How to Use Scroll Panes for more details
Related
Before I start, I'm aware that its a bad idea to not use a Layout Manager and usually I do use one, however, I also have all my components automatically re-size and relocate based on the size of the window. In addition the program I'm working on is only intended to run on 1 machine throughout its entire lifetime. Please don't downvote me just because of lack of layout manager, I found it to be what I need for this particular program.
To my issue, I found a similar post on stackoverflow but a solution was never achieved.
I'm adding a dynamic amount of JLabels to my JPanel, I've noticed that when not using a layout manager, the scroller doesn't work.
This is a simplified version of my initialization code.
JPanel mypanel = new JPanel();
mypanel.setLayout(null);
mypanel.setSize(800,450);
mypanel.setForeground(Color.WHITE);
mypanel.setBackground(Color.BLACK);
scrollablePanel = new JScrollPane(mypanel);
scrollablePanel.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
scrollablePanel.setPreferredSize(new Dimension(800,300));
scrollablePanel.setSize(800,300);
scrollablePanel.setLocation(250,156);
myContainer.add(scrollablePanel);
where myContainer would be the container (also without a layout manager). The JLabels are added later on to the JPanel with:
enter code heremypanel.add(label1);
after some basic settings are set for the labels such as setForeground and setBackground.
Unfortunately when run, the scrollbar appears as if its not required (see image)
http://i.imgur.com/zp0QKGG.png
The table text seen in the image is made up of multiple JLabels.
If it's not possible to resolve the issue without using a Layout Manager I will switch to BoxLayout, I was just hoping there would be a solution.
The problem is JScrollPanel needs the preferred size of the view component to determine when the view exceeds the scroll pane's viewable area.
The preferred size of a component is normally determined via the layout manager. While you can use setPreferredSize, it is typically discouraged and you will simply run into the same problem as the content exceeds what ever value you decide to set.
A better solution would be to use a LayoutManager or compound layout (using multiple layout managers over multiple containers) to achieve the result you desired...or write your own...
Unfortunately, I have seen this question multiple times but unfortunately I do not know what I am doing well enough to be able to interpret what I have to implement in my own code.
I have used the GUI editor in netbeans to create a JScrollPane and a JPanel on top of this. I am aware I can create these components at runtime along with everything else but this proved problematic and simply adding the scroll pane and panel in the editor and adding components to them during runtime has worked for me thus far.
So far, creating components and adding them to the panel is no problem. The problem I face is that the scroll pane will not update itself to enable the user to scroll further down to view the created components at the bottom. I have been generating ‘entries’ each time a button is pressed, that currently creates a JTextField and adds this component to the panel, more components are going to be added later but for now this is just experimentation.
Once the ‘list’ of ‘entries’ exceeds the limit of the window, the window has to be resized in order to view components at the bottom but after a certain number of entries (around 25-30) the components are no longer viewable as the scroll bar does not scroll down the panel.
This is how I am adding components at runtime...
JTextField txtName1 = new JTextField();
txtName1.setLocation(10, 90);
txtName1.setSize(135, 25);
pnlContainer.add(txtName1);
The 'pnlContainer' is attached on top of the 'jspContainer' which is my JScrollPane and I am using the 'repaint()' method to get the components visible on the panel.
So far, adding components at runtime has worked, all of the components are visible and interact-able.
I am fairly new to programming in general with only a few years experience, any documentation that may help, tutorials or anything else is greatly appreciated. Documentation is always welcome as I still have a lot to learn.
JTextField txtName1 = new JTextField();
txtName1.setLocation(10, 90);
txtName1.setSize(135, 25);
pnlContainer.add(txtName1);
So far, adding components at runtime has worked, all of the components are visible and interact-able.
In you above code example you are setting the size/location of each component which implies you are using a null layout. Don't use a null layout!!!
Swing was designed to be used with layout managers and scrolling will work properly when you use panels with a layout manager.
The layout manager is responsible for determining the "preferred size" of the panel. The panel will then display scrollbars automatically when the preferred size of the panel is greater than the size of the scroll panel.
When you use a null layout the preferred size of the panel is 0, so the scrollbars will never appear.
Before I start, I'm aware that its a bad idea to not use a Layout Manager and usually I do use one, however, I also have all my components automatically re-size and relocate based on the size of the window. In addition the program I'm working on is only intended to run on 1 machine throughout its entire lifetime. Please don't downvote me just because of lack of layout manager, I found it to be what I need for this particular program.
To my issue, I found a similar post on stackoverflow but a solution was never achieved.
I'm adding a dynamic amount of JLabels to my JPanel, I've noticed that when not using a layout manager, the scroller doesn't work.
This is a simplified version of my initialization code.
JPanel mypanel = new JPanel();
mypanel.setLayout(null);
mypanel.setSize(800,450);
mypanel.setForeground(Color.WHITE);
mypanel.setBackground(Color.BLACK);
scrollablePanel = new JScrollPane(mypanel);
scrollablePanel.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
scrollablePanel.setPreferredSize(new Dimension(800,300));
scrollablePanel.setSize(800,300);
scrollablePanel.setLocation(250,156);
myContainer.add(scrollablePanel);
where myContainer would be the container (also without a layout manager). The JLabels are added later on to the JPanel with:
enter code heremypanel.add(label1);
after some basic settings are set for the labels such as setForeground and setBackground.
Unfortunately when run, the scrollbar appears as if its not required (see image)
http://i.imgur.com/zp0QKGG.png
The table text seen in the image is made up of multiple JLabels.
If it's not possible to resolve the issue without using a Layout Manager I will switch to BoxLayout, I was just hoping there would be a solution.
The problem is JScrollPanel needs the preferred size of the view component to determine when the view exceeds the scroll pane's viewable area.
The preferred size of a component is normally determined via the layout manager. While you can use setPreferredSize, it is typically discouraged and you will simply run into the same problem as the content exceeds what ever value you decide to set.
A better solution would be to use a LayoutManager or compound layout (using multiple layout managers over multiple containers) to achieve the result you desired...or write your own...
I am attempting to put a JGoodies panel into a JScrollPane with only a vertical scroll bar; any elements larger than the current JScrollPane width should be truncated. However I can't figure out a way to make this work
Example of the effect I'm going for
What I don't want to happen
My current code is essentially:
FormLayout locationsLayout = new FormLayout("15dlu, pref, 5dlu, pref, 5dlu, pref:grow", "");
locationsBuilder = new DefaultFormBuilder(locationsLayout)
.background(Color.WHITE)
.lineGapSize(Sizes.ZERO);
locationsPane = new JScrollPane(locationsBuilder.getPanel());
locationsPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
locationsPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
//...Sometime later, the user adds a folder...
FormLayout headerLayout = new FormLayout("pref, pref", "pref");
DefaultFormBuilder headerBuilder = new DefaultFormBuilder(headerLayout)
.background(Color.WHITE)
.lineGapSize(Sizes.ZERO);
headerBuilder.add(curContainer.getGuiHeader(), CC.xy(1, 1));
headerBuilder.add(curContainer.getGuiTablePrefix(), CC.xy(2, 1));
locationsBuilder.leadingColumnOffset(0);
locationsBuilder.append(headerBuilder.getPanel(), 6);
Things I've tried
Various permutations of min, pref, grow, fill, etc. Nothing changed this behavior
Passing a custom JPanel that implements Scrollable to the locationsBuilder DefaultFormBuilder constructor as documented here, here, or here
Trying the other vertical scroll bar options on JScrollPane
I don't know what else I can try. Does anybody have any suggestions?
I never could find an exact answer to this specific setup. My guess is that JGoodies dies bit handle nested layouts very well.
I ended up "fixing" this by using only one single panel for the entire locations scroll pane. This made the layout a bit complicated: Multiple cells now had to span columns and I had to manually adjust the column offset. But in the end it works
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.