Examples of ScrollBar

com.pointcliki.ui.ScrollBar
de.lessvoid.nifty.controls.Scrollbar
Scrollbar. @author void
java.awt.Scrollbar
The Scrollbar class embodies a scroll bar, a familiar user-interface object. A scroll bar provides a convenient means for allowing a user to select from a range of values. The following three vertical scroll bars could be used as slider controls to pick the red, green, and blue components of a color:

Each scroll bar in this example could be created with code similar to the following:
```
 redSlider=new Scrollbar(Scrollbar.VERTICAL, 0, 1, 0, 255); add(redSlider); 
```
Alternatively, a scroll bar can represent a range of values. For example, if a scroll bar is used for scrolling through text, the width of the "bubble" (also called the "thumb" or "scroll box") can be used to represent the amount of text that is visible. Here is an example of a scroll bar that represents a range:

The value range represented by the bubble in this example is the visible amount. The horizontal scroll bar in this example could be created with code like the following:
```
 ranger = new Scrollbar(Scrollbar.HORIZONTAL, 0, 60, 0, 300); add(ranger); 
```
Note that the actual maximum value of the scroll bar is the maximum minus the visible amount. In the previous example, because the maximum is 300 and the visible amount is 60, the actual maximum value is 240. The range of the scrollbar track is 0 - 300. The left side of the bubble indicates the value of the scroll bar.
Normally, the user changes the value of the scroll bar by making a gesture with the mouse. For example, the user can drag the scroll bar's bubble up and down, or click in the scroll bar's unit increment or block increment areas. Keyboard gestures can also be mapped to the scroll bar. By convention, the Page Up and Page Down keys are equivalent to clicking in the scroll bar's block increment and block decrement areas.
When the user changes the value of the scroll bar, the scroll bar receives an instance of AdjustmentEvent. The scroll bar processes this event, passing it along to any registered listeners.
Any object that wishes to be notified of changes to the scroll bar's value should implement AdjustmentListener, an interface defined in the package java.awt.event. Listeners can be added and removed dynamically by calling the methods addAdjustmentListener and removeAdjustmentListener.
The AdjustmentEvent class defines five types of adjustment event, listed here:
- AdjustmentEvent.TRACK is sent out when the user drags the scroll bar's bubble.
- AdjustmentEvent.UNIT_INCREMENT is sent out when the user clicks in the left arrow of a horizontal scroll bar, or the top arrow of a vertical scroll bar, or makes the equivalent gesture from the keyboard.
- AdjustmentEvent.UNIT_DECREMENT is sent out when the user clicks in the right arrow of a horizontal scroll bar, or the bottom arrow of a vertical scroll bar, or makes the equivalent gesture from the keyboard.
- AdjustmentEvent.BLOCK_INCREMENT is sent out when the user clicks in the track, to the left of the bubble on a horizontal scroll bar, or above the bubble on a vertical scroll bar. By convention, the Page Up key is equivalent, if the user is using a keyboard that defines a Page Up key.
- AdjustmentEvent.BLOCK_DECREMENT is sent out when the user clicks in the track, to the right of the bubble on a horizontal scroll bar, or below the bubble on a vertical scroll bar. By convention, the Page Down key is equivalent, if the user is using a keyboard that defines a Page Down key.
The JDK 1.0 event system is supported for backwards compatibility, but its use with newer versions of the platform is discouraged. The five types of adjustment events introduced with JDK 1.1 correspond to the five event types that are associated with scroll bars in previous platform versions. The following list gives the adjustment event type, and the corresponding JDK 1.0 event type it replaces.
- AdjustmentEvent.TRACK replaces Event.SCROLL_ABSOLUTE
- AdjustmentEvent.UNIT_INCREMENT replaces Event.SCROLL_LINE_UP
- AdjustmentEvent.UNIT_DECREMENT replaces Event.SCROLL_LINE_DOWN
- AdjustmentEvent.BLOCK_INCREMENT replaces Event.SCROLL_PAGE_UP
- AdjustmentEvent.BLOCK_DECREMENT replaces Event.SCROLL_PAGE_DOWN
Note: We recommend using a Scrollbar for value selection only. If you want to implement a scrollable component inside a container, we recommend you use a {@link ScrollPane ScrollPane}. If you use a Scrollbar for this purpose, you are likely to encounter issues with painting, key handling, sizing and positioning. @version 1.112, 07/11/06 @author Sami Shaio @see java.awt.event.AdjustmentEvent @see java.awt.event.AdjustmentListener @since JDK1.0
javafx.scene.control.ScrollBar
org.apache.pivot.wtk.ScrollBar
Component that allows a user to select one of a range of values. Most often used by scroll panes.
org.eclipse.draw2d.ScrollBar
org.eclipse.swt.widgets.ScrollBar
/swt/examples.php">SWT Example: ControlExample @see Sample code and further information @noextend This class is not intended to be subclassed by clients.
org.joshy.gfx.node.control.Scrollbar
pivot.wtk.ScrollBar
Component that allows a user to select one of a range of values. Most often used by scroll panes. @author gbrown
pu.web.client.gui.Scrollbar

Examples of org.apache.pivot.wtk.ScrollBar

        return preferredWidth;
    }


    @Override
    public int getPreferredHeight(int width) {
        ScrollBar scrollBar = (ScrollBar)getComponent();


        int preferredHeight = 0;


        if (scrollBar.getOrientation() == Orientation.HORIZONTAL) {
            preferredHeight = DEFAULT_THICKNESS;
        } else {
            preferredHeight = DEFAULT_LENGTH;
        }

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Examples of org.apache.pivot.wtk.ScrollBar

        return preferredHeight;
    }


    @Override
    public Dimensions getPreferredSize() {
        ScrollBar scrollBar = (ScrollBar)getComponent();


        int preferredWidth = 0;
        int preferredHeight = 0;


        if (scrollBar.getOrientation() == Orientation.HORIZONTAL) {
           preferredWidth = DEFAULT_LENGTH;
           preferredHeight = DEFAULT_THICKNESS;
        } else {
           preferredWidth = DEFAULT_THICKNESS;
           preferredHeight = DEFAULT_LENGTH;

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Examples of org.apache.pivot.wtk.ScrollBar

        return new Dimensions(preferredWidth, preferredHeight);
    }


    @Override
    public void layout() {
        ScrollBar scrollBar = (ScrollBar)getComponent();


        int width = getWidth();
        int height = getHeight();


        int start = scrollBar.getStart();
        int end = scrollBar.getEnd();
        int extent = scrollBar.getExtent();
        int value = scrollBar.getValue();


        int maxLegalRealValue = end - extent;
        int numLegalRealValues = maxLegalRealValue - start + 1;
        float extentPercentage = (float)extent / (float)(end - start);


        if (scrollBar.getOrientation() == Orientation.HORIZONTAL) {
            scrollUpButton.setSize(scrollUpButton.getPreferredWidth(-1), height);
            scrollUpButton.setLocation(0, 0);


            scrollDownButton.setSize(scrollDownButton.getPreferredWidth(-1), height);
            scrollDownButton.setLocation(width - scrollDownButton.getWidth(), 0);


            if (scrollBar.isEnabled()) {
                // Calculate the handle width first, as it dictates how much
                // room is left to represent the range of legal values. Note
                // that the handle may overlap each scroll button by 1px so
                // that its borders merge into the borders of the scroll buttons
                int availableWidth = width - scrollUpButton.getWidth() -
                    scrollDownButton.getWidth() + 2;
                int handleWidth = Math.max(minimumHandleLength,
                    Math.round(extentPercentage * availableWidth));


                // Calculate the position of the handle by calculating the
                // scale that maps logical value to pixel value
                int numLegalPixelValues = availableWidth - handleWidth + 1;
                float valueScale = (float)numLegalPixelValues / (float)numLegalRealValues;
                int handleX = (int)((value - start) * valueScale) +
                    scrollUpButton.getWidth() - 1;


                if (handleWidth > availableWidth) {
                    // If we can't fit the handle, we hide it
                    handle.setVisible(false);
                } else {
                    handle.setVisible(true);


                    handle.setSize(handleWidth, height);
                    handle.setLocation(handleX, 0);
                }
            } else {
                handle.setVisible(false);
            }
        } else {
            scrollUpButton.setSize(width, scrollUpButton.getPreferredHeight(-1));
            scrollUpButton.setLocation(0, 0);


            scrollDownButton.setSize(width, scrollDownButton.getPreferredHeight(-1));
            scrollDownButton.setLocation(0, height - scrollDownButton.getHeight());


            if (scrollBar.isEnabled()) {
                // Calculate the handle height first, as it dictates how much
                // room is left to represent the range of legal values. Note
                // that the handle may overlap each scroll button by 1px so
                // that its borders merge into the borders of the scroll buttons
                int availableHeight = height - scrollUpButton.getHeight() -

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Examples of org.apache.pivot.wtk.ScrollBar


    @Override
    public void paint(Graphics2D graphics) {
        super.paint(graphics);


        ScrollBar scrollBar = (ScrollBar)getComponent();


        int width = getWidth();
        int height = getHeight();


        graphics.setPaint(borderColor);


        // Paint the scroll bar border lines
        if (scrollBar.getOrientation() == Orientation.HORIZONTAL) {
            int scrollUpButtonWidth = scrollUpButton.getWidth();
            int scrollDownButtonWidth = scrollDownButton.getWidth();


            GraphicsUtilities.drawLine(graphics, scrollUpButtonWidth, 0,
                width - scrollDownButtonWidth - scrollUpButtonWidth, Orientation.HORIZONTAL);

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Examples of org.apache.pivot.wtk.ScrollBar

    public boolean mouseDown(Component component, Mouse.Button button, int x, int y) {
        boolean consumed = super.mouseDown(component, button, x, y);


        if (button == Mouse.Button.LEFT
            && handle.isVisible()) {
            ScrollBar scrollBar = (ScrollBar)getComponent();


            // Begin automatic block scrolling. Calculate the direction of
            // the scroll by checking to see if the user pressed the mouse
            // in the area "before" the handle or "after" it.
            int direction;
            int realStopValue;


            if (scrollBar.getOrientation() == Orientation.HORIZONTAL) {
                direction = x < handle.getX() ? -1 : 1;


                int pixelStopValue = x - scrollUpButton.getWidth() + 1;


                if (direction == 1) {

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Examples of org.apache.pivot.wtk.ScrollBar

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


        ScrollBar scrollBar = (ScrollBar)getComponent();


        int previousValue = scrollBar.getValue();
        int newValue = previousValue + (scrollAmount * wheelRotation *
            scrollBar.getUnitIncrement());


        if (wheelRotation > 0) {
            int maxValue = scrollBar.getEnd() - scrollBar.getExtent();
            newValue = Math.min(newValue, maxValue);


            if (previousValue < maxValue) {
                consumed = true;
            }
        } else {
            newValue = Math.max(newValue, 0);


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


        scrollBar.setValue(newValue);


        return consumed;
    }

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Examples of org.apache.pivot.wtk.ScrollBar

     *
     * @return
     * <tt>&lt;number of legal pixel values&gt; / &lt;number of legal real values&gt;</tt>
     */
    private float getValueScale() {
        ScrollBar scrollBar = (ScrollBar)getComponent();


        float valueScale;


        int start = scrollBar.getStart();
        int end = scrollBar.getEnd();
        int extent = scrollBar.getExtent();
        int maxLegalRealValue = end - extent;


        int numLegalRealValues = maxLegalRealValue - start + 1;
        int numLegalPixelValues;


        if (scrollBar.getOrientation() == Orientation.HORIZONTAL) {
            int availableWidth = getWidth() - scrollUpButton.getWidth() -
                scrollDownButton.getWidth() + 2;
            numLegalPixelValues = availableWidth - handle.getWidth() + 1;
        } else {
            int availableHeight = getHeight() - scrollUpButton.getHeight() -

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Examples of org.apache.pivot.wtk.ScrollBar

                scheduledScrollCallback = null;
            }
        }


        private void scroll() {
            ScrollBar scrollBar = (ScrollBar)TerraScrollBarSkin.this.getComponent();


            int start = scrollBar.getStart();
            int end = scrollBar.getEnd();
            int extent = scrollBar.getExtent();
            int value = scrollBar.getValue();


            int adjustment;


            if (incrementType == Mouse.ScrollType.UNIT) {
                adjustment = direction * scrollBar.getUnitIncrement();
            } else {
                adjustment = direction * scrollBar.getBlockIncrement();
            }


            if (adjustment < 0) {
                int newValue = Math.max(value + adjustment, start);
                scrollBar.setValue(newValue);


                if (stopValue != -1
                    && newValue < stopValue) {
                    // We've reached the explicit stop value
                    stop();
                }


                if (newValue == start) {
                    // We implicit stop at the minimum scroll bar value
                    stop();
                }
            } else {
                int newValue = Math.min(value + adjustment, end - extent);
                scrollBar.setValue(newValue);


                if (stopValue != -1
                    && newValue > stopValue) {
                    // We've reached the explicit stop value
                    stop();

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Examples of org.apache.pivot.wtk.ScrollBar


        @Override
        public void paint(Graphics2D graphics) {
            // Apply scroll bar styles to the button
            ScrollButton scrollButton = (ScrollButton)getComponent();
            ScrollBar scrollBar = (ScrollBar)TerraScrollBarSkin.this.getComponent();
            Orientation orientation = scrollBar.getOrientation();


            int width = getWidth();
            int height = getHeight();


            Color backgroundColor;

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Examples of org.apache.pivot.wtk.ScrollBar

    }


    protected abstract class ScrollButtonImage extends Image {
        @Override
        public int getWidth() {
            ScrollBar scrollBar = (ScrollBar)getComponent();
            Orientation orientation = scrollBar.getOrientation();
            return (orientation == Orientation.HORIZONTAL ? 5 : 7);
        }

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