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Class ScrollView

public class netscape.application.ScrollView
    extends netscape.application.View
    implements netscape.application.Scrollable
{
    /* Constructors
     */
    public ScrollView();
    public ScrollView(Rect);
    public ScrollView(int, int, int, int);

    /* Methods
     */
    public DragDestination acceptsDrag(DragSession, int, int);
    public void addScrollBar(Target);
    public void addSubview(View);
    public Color backgroundColor();
    public void computeVisibleRect(Rect);
    public View contentView();
    public int cursorForPoint(int, int);
    public void decode(Decoder);
    public void describeClassInfo(ClassInfo);
    public void didSizeBy(int, int);
    public void drawSubviews(Graphics);
    public void drawView(Graphics);
    public void encode(Encoder);
    public boolean isTransparent();
    public int lengthOfContentViewForAxis(int);
    public int lengthOfScrollViewForAxis(int);
    public boolean mouseDown(MouseEvent);
    public int positionOfContentViewForAxis(int);
    public void removeScrollBar(Target);
    public boolean scrollBarUpdatesEnabled();
    public void scrollBy(int, int);
    public void scrollRectToVisible(Rect);
    public void scrollTo(int, int);
    public void setBackgroundColor(Color);
    public void setContentView(View);
    public void setScrollBarUpdatesEnabled(boolean);
    public void setTransparent(boolean);
    public void subviewDidResize(View);
    public void updateScrollBars();
}

See Also:

ScrollBar, ScrollGroup, Scrollable

Constructors

ScrollView

  public ScrollView()

Constructs a ScrollView with origin (0, 0) and zero width and height.

ScrollView

  public ScrollView(Rect rect)

Constructs a ScrollView with bounds rect.

ScrollView

  public ScrollView(int x,
                    int y,
                    int width,
                    int height)

Constructs a ScrollView with bounds (x, y, width, height).

Methods

  public void addSubview(View aView)

Overridden to prevent multiple Views from being added to the ScrollView. Use the setContentView() method to set the View scrolled by the ScrollView.

Overrides:

addSubview in class View

See Also:

setContentView

  public void setContentView(View aView)

Sets the View scrolled by the ScrollView to aView.

  public View contentView()

Returns the View scrolled by the ScrollView.

See Also:

setContentView

  public int cursorForPoint(int x,
                            int y)

Overridden to return the ScrollView's contentView's cursor for this point.

Overrides:

cursorForPoint in class View

  public void setBackgroundColor(Color aColor)

Returns the ScrollView's background Color. If not transparent, the ScrollView uses the background Color to paint the portions of itself not covered by its contentView.

  public Color backgroundColor()

Returns the ScrollView's background Color.

See Also:

setBackgroundColor

  public void setTransparent(boolean flag)

Sets the ScrollView to be transparent or opaque.

  public boolean isTransparent()

Overridden to return true if the ScrollView is transparent.

Overrides:

isTransparent in class View

See Also:

setTransparent

  public void addScrollBar(Target aScrollBar)

Adds aScrollBar to the ScrollView's Vector of Targets interested in scroll changes. Whenever the ScrollView scrolls its contentView, it sends the ScrollBar.UPDATE command to all Targets in this Vector, with itself as the object. A Target need not be a ScrollBar.

  public void removeScrollBar(Target aScrollBar)

Removes aScrollBar from its Vector of Targets interested in scroll changes.

See Also:

addScrollBar

  public void setScrollBarUpdatesEnabled(boolean flag)

Enables (or disables) the ScrollView to (from) send messages to Targets in its ScrollBar Targets Vector when the ScrollView scrolls its contentView.

See Also:

addScrollBar

  public boolean scrollBarUpdatesEnabled()

Returns true if ScrollBar updates are enabled.

See Also:

setScrollBarUpdatesEnabled

  public void updateScrollBars()

If ScrollBar updates are enabled, sends the ScrollBar.UPDATE command to all Targets in the ScrollView's ScrollBar Vector with itself as the object. Upon receiving this command, a ScrollBar should verify that its knob's size and position accurately reflect the ScrollView's state.

  public void scrollRectToVisible(Rect contentRect)

Overridden to scroll the contentView such that aRect within the contentView becomes visible. Calls scrollBy().

Overrides:

scrollRectToVisible in class View

See Also:

scrollBy

  public void scrollTo(int x,
                       int y)

Moves the contentView's origin to (x, y). If the ScrollView has a drawing buffer, scrolling moves as much of the contentView's area as possible and then calls draw() to redraw the newly exposed portions, otherwise just calls the contentView's draw() method to completely redraw the contentView's visible portion.

  public void scrollBy(int deltaX,
                       int deltaY)

Computes the contentView's new coordinates and calls scrollTo().

See Also:

scrollTo

  public void subviewDidResize(View aSubview)

Overridden to react to contentView resizes.

Overrides:

subviewDidResize in class View

  public void didSizeBy(int deltaWidth,
                        int deltaHeight)

Overridden to ensure that the contentView is correctly positioned.

Overrides:

didSizeBy in class View

  public void computeVisibleRect(Rect aRect)

Overidden to perform additional clipping.

Overrides:

computeVisibleRect in class View

  public void drawView(Graphics g)

Overidden to draw the area not covered by the contentView, unless transparent.

Overrides:

drawView in class View

  public void drawSubviews(Graphics g)

Overridden to perform post-drawing processing.

Overrides:

drawSubviews in class View

  public boolean mouseDown(MouseEvent event)

Overridden to pass any mouse down Event received by the ScrollView on to its contentView.

Overrides:

mouseDown in class View

  public DragDestination acceptsDrag(DragSession session,
                                     int x,
                                     int y)

Overridden to forward the acceptsDrag() message to its contentView.

Overrides:

acceptsDrag in class View

  public int lengthOfScrollViewForAxis(int axis)

Scrollable interface method returning the appropriate bounds value.

See Also:

Scrollable

  public int lengthOfContentViewForAxis(int axis)

Scrollable interface method returning the appropriate contentView bounds value.

See Also:

Scrollable

  public int positionOfContentViewForAxis(int axis)

Scrollable interface method returning the appropriate contentView bounds value.

See Also:

Scrollable

  public void describeClassInfo(ClassInfo info)

Describes the ScrollView class' information.

Overrides:

describeClassInfo in class View

See Also:

describeClassInfo

  public void encode(Encoder encoder) throws CodingException

Encodes the ScrollView instance.

Overrides:

encode in class View

See Also:

encode

  public void decode(Decoder decoder) throws CodingException

Decodes the ScrollView instance.

Overrides:

decode in class View

See Also:

decode

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