Examples of java.awt.ScrollPane

java.awt.ScrollPane
A container class which implements automatic horizontal and/or vertical scrolling for a single child component. The display policy for the scrollbars can be set to:
1. as needed: scrollbars created and shown only when needed by scrollpane
2. always: scrollbars created and always shown by the scrollpane
3. never: scrollbars never created or shown by the scrollpane
The state of the horizontal and vertical scrollbars is represented by two ScrollPaneAdjustable objects (one for each dimension) which implement the Adjustable interface. The API provides methods to access those objects such that the attributes on the Adjustable object (such as unitIncrement, value, etc.) can be manipulated.
Certain adjustable properties (minimum, maximum, blockIncrement, and visibleAmount) are set internally by the scrollpane in accordance with the geometry of the scrollpane and its child and these should not be set by programs using the scrollpane.
If the scrollbar display policy is defined as "never", then the scrollpane can still be programmatically scrolled using the setScrollPosition() method and the scrollpane will move and clip the child's contents appropriately. This policy is useful if the program needs to create and manage its own adjustable controls.
The placement of the scrollbars is controlled by platform-specific properties set by the user outside of the program.
The initial size of this container is set to 100x100, but can be reset using setSize().
Scrolling with the wheel on a wheel-equipped mouse is enabled by default. This can be disabled using setWheelScrollingEnabled. Wheel scrolling can be customized by setting the block and unit increment of the horizontal and vertical Adjustables. For information on how mouse wheel events are dispatched, see the class description for {@link MouseWheelEvent}.
Insets are used to define any space used by scrollbars and any borders created by the scroll pane. getInsets() can be used to get the current value for the insets. If the value of scrollbarsAlwaysVisible is false, then the value of the insets will change dynamically depending on whether the scrollbars are currently visible or not. @version 1.99 04/15/08 @author Tom Ball @author Amy Fowler @author Tim Prinzing

    if ( !e.getSource().equals( currentComponent ) ) {
      if ( model != null ) {
        int oldSelection = selectedRow;
        int numChildren = model.getNumChildren();
        int keyCode = e.getKeyCode();
        ScrollPane sp = ( ( ScrollPane )getParent().getParent() );
        int y = ( int )sp.getScrollPosition().y;
        if ( ( keyCode == e.VK_UP ) || ( keyCode == VK_KP_UP ) ) {
          selectedRow = Math.max( 0, selectedRow - 1 );
          sp.setScrollPosition( 0, y - rowHeight );
        }
        else if ( ( keyCode == e.VK_DOWN ) || ( keyCode == VK_KP_DOWN ) ) {
          selectedRow = Math.min( numChildren - 1, selectedRow + 1 );
          sp.setScrollPosition( 0,
                                Math.min( y + rowHeight, ( ( numChildren - 2 ) * rowHeight ) ) );
        }
        else
          return;

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    public static void main(String[] args) {
        new java_awt_ScrollPane().test(true);
    }


    protected ScrollPane getObject() {
        return new ScrollPane(ScrollPane.SCROLLBARS_NEVER);
    }

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    protected static Frame createVncClientMainWindow(BufferedImageCanvas canvas, String title, WindowListener windowListener) {
        // Create AWT windows
        Frame frame = new Frame(title + " - RDP");


        // Use scrolling pane to support screens, which are larger than ours
        scroller = new ScrollPane(ScrollPane.SCROLLBARS_AS_NEEDED);
        scroller.add(canvas);
        scroller.setSize(canvas.getWidth(), canvas.getHeight());


        frame.add(scroller);
        frame.pack();

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      renderPanel = new RenderPanel(chemModel, this.getWidth(), this.getHeight(), fitToScreen, debug, true, applet);
    } catch (IOException e) {
      announceError(e);
    }
    if (!fitToScreen) {
          ScrollPane scroller = new ScrollPane();
          scroller.add(renderPanel);
          this.add(scroller, BorderLayout.CENTER);
    } else {
      this.add(renderPanel,BorderLayout.CENTER);
    }
  }

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