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Java - JScrollPane (changing up/down button size)

  • 11-08-2006 12:09pm
    #1
    Dr Pepper
    Registered Users, Registered Users 2 Posts: 841 ✭✭✭


    Hi,

    I am using JScrollPane for a TouchScreen program and I want to make the up/down arrow buttons bigger (so they can be more easily pressed).

    I have tried increasing the size of the vertical scroll bar and that does increase the width of the up arrow, but not the height.

    I have also made my own up and down arrow buttons to the side of the scrollbar which, when pressed, call something like: scrollbar.setValue(scrollbar.getValue() + scrollbar.getUnitIncrement()) but the viewport image gets a bit distorted (you know how scrolling in java and JLists,etc. do!) and the scrolling is all jumpy.

    Any suggestions?


Comments

  • #2
    Dr Pepper
    Registered Users, Registered Users 2 Posts: 841 ✭✭✭Dr Pepper


    Ok, I eventually figured this out. So, just in case anyone is looking for this in the future, here it is:

    I made a class called MyBasicScrollBarUI which extends BasicScrollBarUI. In this class I have an empty constructor and I over-ride the methods createIncreaseButton and createDecreaseButton. These just create the up and down arrow buttons and return them so I have created my own and returned them instead. I have used MyBasicScrollBarUI in my code like this:
    JTextArea JTA;
JScrollPane JSP;
JScrollBar JSB;
MyBasicScrollBarUI ui;

JTA = new JTextArea();
JSP = new JScrollPane(JTA);
JSP.setPreferredSize(new Dimension(800,500));
JSB = JSP.getVerticalScrollBar();
JSB.setPreferredSize(new Dimension(60,500));
ui = new MyBasicScrollBarUI();
JSB.setUI(ui);
etc....


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