Examples of org.apache.pivot.wtk.ScrollPane$ScrollPaneListenerList

org.apache.pivot.wtk.ScrollPane
Container that provides a scrollable view of a component, with optional fixed row and column headers.
The single component to be scrolled will typically be a {@link Container}and should be specified by the {@link #setView setView()} method (the "view" property).So, even then though this class is a {@link Container}, you should not add components to it via the {@link #add add()} method.


    @Override
    public void install(Component component) {
        super.install(component);


        ScrollPane scrollPane = (ScrollPane)component;
        scrollPane.getViewportListeners().add(this);
        scrollPane.getScrollPaneListeners().add(this);


        scrollPane.add(horizontalScrollBar);
        scrollPane.add(verticalScrollBar);


        scrollPane.add(topLeftCorner);
        scrollPane.add(bottomLeftCorner);
        scrollPane.add(bottomRightCorner);
        scrollPane.add(topRightCorner);


        horizontalScrollBar.getScrollBarValueListeners().add(this);
        verticalScrollBar.getScrollBarValueListeners().add(this);
    }

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    @Override
    public int getPreferredWidth(int height) {
        int preferredWidth = 0;


        ScrollPane scrollPane = (ScrollPane)getComponent();
        Component view = scrollPane.getView();


        if (view != null) {
            int preferredRowHeaderWidth = 0;
            Component rowHeader = scrollPane.getRowHeader();
            if (rowHeader != null) {
                preferredRowHeaderWidth = rowHeader.getPreferredWidth(-1);
            }


            int preferredColumnHeaderHeight = 0;
            Component columnHeader = scrollPane.getColumnHeader();
            if (columnHeader != null) {
                preferredColumnHeaderHeight = columnHeader.getPreferredHeight(-1);
            }


            ScrollBarPolicy verticalPolicy = scrollPane.getVerticalScrollBarPolicy();


            if (verticalPolicy != ScrollBarPolicy.FILL) {
                // Get the unconstrained preferred size of the view
                Dimensions preferredViewSize = view.getPreferredSize();

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    @Override
    public int getPreferredHeight(int width) {
        int preferredHeight = 0;


        ScrollPane scrollPane = (ScrollPane)getComponent();
        Component view = scrollPane.getView();


        if (view != null) {
            int preferredRowHeaderWidth = 0;
            Component rowHeader = scrollPane.getRowHeader();
            if (rowHeader != null) {
                preferredRowHeaderWidth = rowHeader.getPreferredWidth(-1);
            }


            int preferredColumnHeaderHeight = 0;
            Component columnHeader = scrollPane.getColumnHeader();
            if (columnHeader != null) {
                preferredColumnHeaderHeight = columnHeader.getPreferredHeight(-1);
            }


            ScrollBarPolicy horizontalPolicy = scrollPane.getHorizontalScrollBarPolicy();


            if (horizontalPolicy != ScrollBarPolicy.FILL) {
                // Get the unconstrained preferred size of the view
                Dimensions preferredViewSize = view.getPreferredSize();

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        return preferredHeight;
    }


    @Override
    public Dimensions getPreferredSize() {
        ScrollPane scrollPane = (ScrollPane)getComponent();


        int preferredWidth = 0;
        int preferredHeight = 0;


        Component view = scrollPane.getView();
        if (view != null) {
            Dimensions preferredViewSize = view.getPreferredSize();


            preferredWidth += preferredViewSize.width;
            preferredHeight += preferredViewSize.height;


            Component rowHeader = scrollPane.getRowHeader();
            if (rowHeader != null) {
                preferredWidth += rowHeader.getPreferredWidth(-1);
            }


            Component columnHeader = scrollPane.getColumnHeader();
            if (columnHeader != null) {
                preferredHeight += columnHeader.getPreferredHeight(-1);
            }


            if (scrollPane.getHorizontalScrollBarPolicy() == ScrollBarPolicy.ALWAYS) {
                preferredHeight += horizontalScrollBar.getPreferredHeight(-1);
            }


            if (scrollPane.getVerticalScrollBarPolicy() == ScrollBarPolicy.ALWAYS) {
                preferredWidth += verticalScrollBar.getPreferredWidth(-1);
            }
        }


        return new Dimensions(preferredWidth, preferredHeight);

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        return new Dimensions(preferredWidth, preferredHeight);
    }


    @Override
    public int getBaseline(int width, int height) {
        ScrollPane scrollPane = (ScrollPane)getComponent();


        Component view = scrollPane.getView();
        Component rowHeader = scrollPane.getRowHeader();
        Component columnHeader = scrollPane.getColumnHeader();


        int baseline = -1;


        int clientWidth = width;
        int clientHeight = height;

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    @Override
    public boolean mouseWheel(Component component, Mouse.ScrollType scrollType, int scrollAmount,
        int wheelRotation, int x, int y) {
        boolean consumed = false;


        ScrollPane scrollPane = (ScrollPane)getComponent();
        Component view = scrollPane.getView();


        if (view != null) {
            // The scroll orientation is tied to whether the shift key was
            // pressed while the mouse wheel was scrolled
            if (Keyboard.isPressed(Keyboard.Modifier.SHIFT)) {
                // Treat the mouse wheel as a horizontal scroll event
                int previousScrollLeft = scrollPane.getScrollLeft();
                int newScrollLeft = previousScrollLeft + (scrollAmount * wheelRotation *
                    horizontalScrollBar.getUnitIncrement());


                if (wheelRotation > 0) {
                    int maxScrollLeft = getMaxScrollLeft();
                    newScrollLeft = Math.min(newScrollLeft, maxScrollLeft);


                    if (previousScrollLeft < maxScrollLeft) {
                        consumed = true;
                    }
                } else {
                    newScrollLeft = Math.max(newScrollLeft, 0);


                    if (previousScrollLeft > 0) {
                        consumed = true;
                    }
                }


                scrollPane.setScrollLeft(newScrollLeft);
            } else {
                // Treat the mouse wheel as a vertical scroll event
                int previousScrollTop = scrollPane.getScrollTop();
                int newScrollTop = previousScrollTop + (scrollAmount * wheelRotation *
                    verticalScrollBar.getUnitIncrement());


                if (wheelRotation > 0) {
                    int maxScrollTop = getMaxScrollTop();
                    newScrollTop = Math.min(newScrollTop, maxScrollTop);


                    if (previousScrollTop < maxScrollTop) {
                        consumed = true;
                    }
                } else {
                    newScrollTop = Math.max(newScrollTop, 0);


                    if (previousScrollTop > 0) {
                        consumed = true;
                    }
                }


                scrollPane.setScrollTop(newScrollTop);
            }
        }


        return consumed;
    }

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    @Override
    public boolean keyPressed(Component component, int keyCode, Keyboard.KeyLocation keyLocation) {
        boolean consumed = super.keyPressed(component, keyCode, keyLocation);


        if (!consumed) {
            ScrollPane scrollPane = (ScrollPane)getComponent();


            int scrollTop = scrollPane.getScrollTop();
            int scrollLeft = scrollPane.getScrollLeft();


            if (keyCode == Keyboard.KeyCode.UP) {
                int newScrollTop = Math.max(scrollTop -
                    verticalScrollBar.getUnitIncrement(), 0);


                scrollPane.setScrollTop(newScrollTop);


                consumed = (newScrollTop != scrollTop);
            } else if (keyCode == Keyboard.KeyCode.DOWN) {
                int newScrollTop = Math.min(scrollTop +
                    verticalScrollBar.getUnitIncrement(), getMaxScrollTop());


                scrollPane.setScrollTop(newScrollTop);


                consumed = (newScrollTop != scrollTop);
            } else if (keyCode == Keyboard.KeyCode.LEFT) {
                int newScrollLeft = Math.max(scrollLeft -
                    horizontalScrollBar.getUnitIncrement(), 0);


                scrollPane.setScrollLeft(newScrollLeft);


                consumed = (newScrollLeft != scrollLeft);
            } else if (keyCode == Keyboard.KeyCode.RIGHT) {
                int newScrollLeft = Math.min(scrollLeft +
                    horizontalScrollBar.getUnitIncrement(), getMaxScrollLeft());


                scrollPane.setScrollLeft(newScrollLeft);


                consumed = (newScrollLeft != scrollLeft);
            } else if (keyCode == Keyboard.KeyCode.PAGE_UP) {
                int increment = verticalScrollBar.getBlockIncrement();
                int newScrollTop = Math.max(scrollTop - increment, 0);


                scrollPane.setScrollTop(newScrollTop);


                consumed = (newScrollTop != scrollTop);
            } else if (keyCode == Keyboard.KeyCode.PAGE_DOWN) {
                int increment = verticalScrollBar.getBlockIncrement();
                int newScrollTop = Math.min(scrollTop + increment, getMaxScrollTop());


                scrollPane.setScrollTop(newScrollTop);


                consumed = (newScrollTop != scrollTop);
            }
        }

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     * The maximum scrollTop value
     */
    private int getMaxScrollTop() {
        int maxScrollTop = 0;


        ScrollPane scrollPane = (ScrollPane)getComponent();
        Component view = scrollPane.getView();


        if (view != null) {
            int viewHeight = view.getHeight();
            int columnHeaderHeight = 0;
            int horizontalScrollBarHeight = 0;
            int height = getHeight();


            Component columnHeader = scrollPane.getColumnHeader();
            if (columnHeader != null) {
                columnHeaderHeight = columnHeader.getHeight();
            }


            if (horizontalScrollBar.isVisible()) {

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     * The maximum scrollLeft value
     */
    private int getMaxScrollLeft() {
        int maxScrollLeft = 0;


        ScrollPane scrollPane = (ScrollPane)getComponent();
        Component view = scrollPane.getView();


        if (view != null) {
            int viewWidth = view.getWidth();
            int rowHeaderWidth = 0;
            int verticalScrollBarWidth = 0;
            int width = getWidth();


            Component rowHeader = scrollPane.getRowHeader();
            if (rowHeader != null) {
                rowHeaderWidth = rowHeader.getWidth();
            }


            if (verticalScrollBar.isVisible()) {

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        return maxScrollLeft;
    }


    @Override
    public void layout() {
        ScrollPane scrollPane = (ScrollPane)getComponent();


        ScrollBarPolicy horizontalPolicy = scrollPane.getHorizontalScrollBarPolicy();
        ScrollBarPolicy verticalPolicy = scrollPane.getVerticalScrollBarPolicy();


        boolean fillWidthToCapacity = false;
        boolean fillHeightToCapacity = false;


        // The FILL_TO_CAPACITY policy means that we try to use AUTO, and only
        // if it ends up not being wide or tall enough do we use FILL


        if (horizontalPolicy == ScrollBarPolicy.FILL_TO_CAPACITY) {
            horizontalPolicy = ScrollBarPolicy.AUTO;
            fillWidthToCapacity = true;
        }


        if (verticalPolicy == ScrollBarPolicy.FILL_TO_CAPACITY) {
            verticalPolicy = ScrollBarPolicy.AUTO;
            fillHeightToCapacity = true;
        }


        layoutHelper(horizontalPolicy, verticalPolicy);


        Component view = scrollPane.getView();
        if (view != null && (fillWidthToCapacity || fillHeightToCapacity)) {
            // We assumed AUTO. Now we check our assumption to see if we
            // need to adjust it to use FILL
            boolean adjustWidth = false, adjustHeight = false;


            if (fillWidthToCapacity) {
                Component rowHeader = scrollPane.getRowHeader();
                int rowHeaderWidth = rowHeader != null ? rowHeader.getWidth() : 0;


                int verticalScrollBarWidth = verticalScrollBar.isVisible() ?
                    verticalScrollBar.getWidth() : 0;
                int minViewWidth = getWidth() - rowHeaderWidth - verticalScrollBarWidth;


                if (view.getWidth() < minViewWidth) {
                    horizontalPolicy = ScrollBarPolicy.FILL;
                    adjustWidth = true;
                }
            }


            if (fillHeightToCapacity) {
                Component columnHeader = scrollPane.getColumnHeader();
                int columnHeaderHeight = columnHeader != null ?
                    columnHeader.getHeight() : 0;


                int horizontalScrollBarHeight = horizontalScrollBar.isVisible() ?
                    horizontalScrollBar.getHeight() : 0;

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