Java ScrollBar类代码示例

import org.eclipse.swt.widgets.ScrollBar; //导入依赖的package包/类
public void updateScroll(){
	Rectangle rect = this.composite.getBounds();
	Rectangle client = this.composite.getClientArea();
	ScrollBar vBar = this.composite.getVerticalBar();
	vBar.setMaximum(Math.round(this.height));
	vBar.setThumb(Math.min(rect.height, client.height));
}
 

import org.eclipse.swt.widgets.ScrollBar; //导入依赖的package包/类
public void setSlider(Slider slider) {
	if (b.text != null && !b.text.isDisposed()) {
		sliderListener = new Listener() {

			@Override
			public void handleEvent(Event arg0) {
				// TODO Auto-generated method stub
				if (slider != null && !slider.isDisposed()) {
					ScrollBar vb = b.text.getVerticalBar();
					slider.setValues(vb.getSelection(), vb.getMinimum(), vb.getMaximum(), vb.getThumb(),
							vb.getIncrement(), vb.getPageIncrement());
				}
			}
		};
		b.text.addListener(SWT.Paint, sliderListener);
	}
}
 

import org.eclipse.swt.widgets.ScrollBar; //导入依赖的package包/类
void installListeners() {
	// Listeners on this popup's table and scroll bar
	proposalTable.addListener(SWT.FocusOut, this);
	ScrollBar scrollbar = proposalTable.getVerticalBar();
	if (scrollbar != null) {
		scrollbar.addListener(SWT.Selection, this);
	}

	// Listeners on this popup's shell
	getShell().addListener(SWT.Deactivate, this);
	getShell().addListener(SWT.Close, this);

	// Listeners on the target control
	control.addListener(SWT.MouseDoubleClick, this);
	control.addListener(SWT.MouseDown, this);
	control.addListener(SWT.Dispose, this);
	control.addListener(SWT.FocusOut, this);
	// Listeners on the target control's shell
	Shell controlShell = control.getShell();
	controlShell.addListener(SWT.Move, this);
	controlShell.addListener(SWT.Resize, this);

}
 

import org.eclipse.swt.widgets.ScrollBar; //导入依赖的package包/类
void removeListeners() {
	if (isValid()) {
		proposalTable.removeListener(SWT.FocusOut, this);
		ScrollBar scrollbar = proposalTable.getVerticalBar();
		if (scrollbar != null) {
			scrollbar.removeListener(SWT.Selection, this);
		}

		getShell().removeListener(SWT.Deactivate, this);
		getShell().removeListener(SWT.Close, this);
	}

	if (control != null && !control.isDisposed()) {

		control.removeListener(SWT.MouseDoubleClick, this);
		control.removeListener(SWT.MouseDown, this);
		control.removeListener(SWT.Dispose, this);
		control.removeListener(SWT.FocusOut, this);

		Shell controlShell = control.getShell();
		controlShell.removeListener(SWT.Move, this);
		controlShell.removeListener(SWT.Resize, this);
	}
}
 

import org.eclipse.swt.widgets.ScrollBar; //导入依赖的package包/类
void scrollHorizontally(ScrollBar scrollBar) {
	if (image == null) {
		return;
	}
	Rectangle canvasBounds = imageCanvas.getClientArea();
	int width = Math.round(imageData.width * xscale);
	int height = Math.round(imageData.height * yscale);
	if (width > canvasBounds.width) {
		// Only scroll if the image is bigger than the canvas.
		int x = -scrollBar.getSelection();
		if (x + width < canvasBounds.width) {
			// Don't scroll past the end of the image.
			x = canvasBounds.width - width;
		}
		imageCanvas.scroll(x, iy, ix, iy, width, height, false);
		ix = x;
	}
}
 

import org.eclipse.swt.widgets.ScrollBar; //导入依赖的package包/类
void scrollVertically(ScrollBar scrollBar) {
	if (image == null) {
		return;
	}
	Rectangle canvasBounds = imageCanvas.getClientArea();
	int width = Math.round(imageData.width * xscale);
	int height = Math.round(imageData.height * yscale);
	if (height > canvasBounds.height) {
		// Only scroll if the image is bigger than the canvas.
		int y = -scrollBar.getSelection();
		if (y + height < canvasBounds.height) {
			// Don't scroll past the end of the image.
			y = canvasBounds.height - height;
		}
		imageCanvas.scroll(ix, y, ix, iy, width, height, false);
		iy = y;
	}
}
 

import org.eclipse.swt.widgets.ScrollBar; //导入依赖的package包/类
private int computeTrim(Rectangle area, Table table, int tableWidth) {
	Point preferredSize= computeTableSize(table, area.width, area.height);
       int trim;
       if (tableWidth > 1) {
       	trim= tableWidth - table.getClientArea().width;
       } else {
       	// initially, the table has no extend and no client area - use the border with
       	// plus some padding as educated guess
       	trim= 2 * table.getBorderWidth() + 1 ;
       }
       if (preferredSize.y > area.height) {
           // Subtract the scrollbar width from the total column width
           // if a vertical scrollbar will be required, but is not currently showing
       	// (in which case it is already subtracted above)
           ScrollBar vBar= table.getVerticalBar();
           if (!vBar.isVisible()) {
           	Point vBarSize= vBar.getSize();
           	trim += vBarSize.x;
           }
       }
	return trim;
}
 

import org.eclipse.swt.widgets.ScrollBar; //导入依赖的package包/类
/**
 * Returns the shell for the given widget. If the widget doesn't represent a
 * SWT object that manage a shell, <code>null</code> is returned.
 * 
 * @param widget
 *            the widget
 * 
 * @return the shell for the given widget
 */
public static Shell getShell(Widget widget) {
	if (widget instanceof Control)
		return ((Control) widget).getShell();
	if (widget instanceof Caret)
		return ((Caret) widget).getParent().getShell();
	if (widget instanceof DragSource)
		return ((DragSource) widget).getControl().getShell();
	if (widget instanceof DropTarget)
		return ((DropTarget) widget).getControl().getShell();
	if (widget instanceof Menu)
		return ((Menu) widget).getParent().getShell();
	if (widget instanceof ScrollBar)
		return ((ScrollBar) widget).getParent().getShell();

	return null;
}
 

import org.eclipse.swt.widgets.ScrollBar; //导入依赖的package包/类
protected void smartScroll(boolean force) {
	ScrollBar scrollbar = chatConsole.inputText.getVerticalBar();
	if (scrollbar != null
			&& scrollbar.isVisible()
			&& getPreferences().getBoolean(
					PreferenceKeys.CHAT_IS_SMART_SCROLL_ENABLED)) {

		if (force) {
			setAutoScrolling(true);
		}
		else if (scrollbar.getMaximum() == scrollbar.getSelection()
				+ scrollbar.getThumb()) {
			setAutoScrolling(true);
		} else {
			setAutoScrolling(false);
		}
	}
}
 

import org.eclipse.swt.widgets.ScrollBar; //导入依赖的package包/类
void setScrollbar() {
	if (itemCount == 0) { return; }
	final ScrollBar verticalBar = getVerticalBar();
	if (verticalBar == null) { return; }
	final int height = getClientArea().height;
	final ParameterExpandItem item = items[itemCount - 1];
	int maxHeight = item.y + bandHeight + spacing;
	if (item.expanded) {
		maxHeight += item.height;
	}

	// claim bottom free space
	if (yCurrentScroll > 0 && height > maxHeight) {
		yCurrentScroll = Math.max(0, yCurrentScroll + maxHeight - height);
		layoutItems(0, false);
	}
	maxHeight += yCurrentScroll;

	final int selection = Math.min(yCurrentScroll, maxHeight);
	final int increment = verticalBar.getIncrement();
	final int pageIncrement = verticalBar.getPageIncrement();
	verticalBar.setValues(selection, 0, maxHeight, height, increment, pageIncrement);
	verticalBar.setVisible(maxHeight > height);
}
 

import org.eclipse.swt.widgets.ScrollBar; //导入依赖的package包/类
private void pageUp() {
	//
	// Ensure there's an anchor.
	//
	ensureAnchorSet();
	
	//
	// Move the scrollbar down one page.
	//
	final ScrollBar verticalBar = grid.getVerticalBar();
	verticalBar.setSelection(Math.max(verticalBar.getSelection() - verticalBar.getPageIncrement(), verticalBar.getMinimum()));
	
	//
	// Cause a repaint.
	//
	gridModel.fireChangeEvent();
	
	//
	// Move the anchor to the new page.
	//
	if (verticalBar.getSelection() != verticalBar.getMaximum()) {
		final Row<T> row = gridModel.getRows().get(grid.getViewport().getFirstRowIndex());
		gridModel.getSelectionModel().setAnchorElement(row.getElement());
	}
}
 

import org.eclipse.swt.widgets.ScrollBar; //导入依赖的package包/类
private void pageDown() {
	//
	// Ensure there's an anchor.
	//
	ensureAnchorSet();
	
	//
	// Move the scrollbar down one page.
	//
	final ScrollBar verticalBar = grid.getVerticalBar();
	verticalBar.setSelection(Math.min(verticalBar.getSelection() + verticalBar.getPageIncrement(), verticalBar.getMaximum()));
	
	//
	// Cause a repaint.
	//
	gridModel.fireChangeEvent();
	
	//
	// Move the anchor to the new page.
	//
	if (verticalBar.getSelection() != verticalBar.getMaximum()) {
		final Row<T> row = gridModel.getRows().get(grid.getViewport().getFirstRowIndex());
		gridModel.getSelectionModel().setAnchorElement(row.getElement());
	}
}
 

import org.eclipse.swt.widgets.ScrollBar; //导入依赖的package包/类
/**
 * Returns the shell for the given widget. If the widget doesn't represent a SWT object that manage a shell,
 * <code>null</code> is returned.
 * 
 * @return the shell for the given widget
 */
public static Shell getShell(Widget widget)
{
	if (widget instanceof Control)
		return ((Control) widget).getShell();
	if (widget instanceof Caret)
		return ((Caret) widget).getParent().getShell();
	if (widget instanceof DragSource)
		return ((DragSource) widget).getControl().getShell();
	if (widget instanceof DropTarget)
		return ((DropTarget) widget).getControl().getShell();
	if (widget instanceof Menu)
		return ((Menu) widget).getParent().getShell();
	if (widget instanceof ScrollBar)
		return ((ScrollBar) widget).getParent().getShell();

	return null;
}
 

import org.eclipse.swt.widgets.ScrollBar; //导入依赖的package包/类
public void dispose()
{
	if (textWidget != null && !textWidget.isDisposed())
	{
		textWidget.removeListener(SWT.MouseDown, listener);
		textWidget.removeListener(SWT.MouseMove, listener);
		textWidget.removeListener(SWT.MouseUp, listener);
		textWidget.removeListener(SWT.KeyDown, listener);
		textWidget.removeListener(SWT.KeyUp, listener);
		textWidget.removeListener(SWT.Resize, listener);
		ScrollBar vBar = textWidget.getVerticalBar();
		if (vBar != null && !vBar.isDisposed())
		{
			vBar.removeListener(SWT.Selection, listener);
		}
	}
	textWidget = null;
	listener = null;
}
 

import org.eclipse.swt.widgets.ScrollBar; //导入依赖的package包/类
/**
 * Restores the state of the filter actions
 * @param memento the memento
 */
public void restoreState(IMemento memento) {
	fMemberFilterActionGroup.restoreState(memento);
	getControl().setRedraw(false);
	refresh();
	getControl().setRedraw(true);

	boolean showInherited= Boolean.valueOf(memento.getString(TAG_SHOWINHERITED)).booleanValue();
	showInheritedMethods(showInherited);

	boolean showDefiningTypes= Boolean.valueOf(memento.getString(TAG_SORTBYDEFININGTYPE)).booleanValue();
	sortByDefiningType(showDefiningTypes);

	ScrollBar bar= getTable().getVerticalBar();
	if (bar != null) {
		Integer vScroll= memento.getInteger(TAG_VERTICAL_SCROLL);
		if (vScroll != null) {
			bar.setSelection(vScroll.intValue());
		}
	}
}