/* uDig - User Friendly Desktop Internet GIS client
* http://udig.refractions.net
* (C) 2010, Refractions Research Inc.
* (C) 2001,1009 IBM Corporation and others
* ------
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* (http://www.eclipse.org/legal/epl-v10.html), and the Refractions BSD
* License v1.0 (http://udig.refractions.net/files/bsd3-v10.html).
* --------
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*/
package org.locationtech.udig.feature.panel;
import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.swt.SWT;
import org.eclipse.swt.accessibility.ACC;
import org.eclipse.swt.accessibility.Accessible;
import org.eclipse.swt.accessibility.AccessibleAdapter;
import org.eclipse.swt.accessibility.AccessibleControlAdapter;
import org.eclipse.swt.accessibility.AccessibleControlEvent;
import org.eclipse.swt.accessibility.AccessibleEvent;
import org.eclipse.swt.events.ControlAdapter;
import org.eclipse.swt.events.ControlEvent;
import org.eclipse.swt.events.FocusEvent;
import org.eclipse.swt.events.FocusListener;
import org.eclipse.swt.events.MouseAdapter;
import org.eclipse.swt.events.MouseEvent;
import org.eclipse.swt.events.MouseMoveListener;
import org.eclipse.swt.events.MouseTrackAdapter;
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.events.PaintListener;
import org.eclipse.swt.events.TraverseEvent;
import org.eclipse.swt.events.TraverseListener;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.FontMetrics;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.FormAttachment;
import org.eclipse.swt.layout.FormData;
import org.eclipse.swt.layout.FormLayout;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.ui.forms.FormColors;
//import org.eclipse.ui.internal.views.properties.tabbed.l10n.TabbedPropertyMessages;
import org.eclipse.ui.internal.views.properties.tabbed.view.TabbedPropertyComposite;
import org.eclipse.ui.views.properties.tabbed.ITabItem;
import org.eclipse.ui.views.properties.tabbed.TabbedPropertySheetWidgetFactory;
/**
* Shows the list of tabs in the feature panel property sheet page.
*
* @see TabbedPropertyList
*/
public class FeaturePanelList
extends Composite {
private static final ListElement[] ELEMENTS_EMPTY = new ListElement[0];
protected static final int NONE = -1;
protected static final int INDENT = 7;
private boolean focus = false;
private ListElement[] elements;
private int selectedElementIndex = NONE;
private int topVisibleIndex = NONE;
private int bottomVisibleIndex = NONE;
private TopNavigationElement topNavigationElement;
private BottomNavigationElement bottomNavigationElement;
private int widestLabelIndex = NONE;
private int tabsThatFitInComposite = NONE;
private Color widgetForeground;
private Color widgetBackground;
private Color widgetNormalShadow;
private Color widgetDarkShadow;
private Color listBackground;
private Color hoverGradientStart;
private Color hoverGradientEnd;
private Color defaultGradientStart;
private Color defaultGradientEnd;
private Color indentedDefaultBackground;
private Color indentedHoverBackground;
private Color navigationElementShadowStroke;
private Color bottomNavigationElementShadowStroke1;
private Color bottomNavigationElementShadowStroke2;
private FeaturePanelWidgetFactory factory;
/**
* One of the tabs in the feature panel list.
*/
public class ListElement extends Canvas {
private ITabItem tab;
private int index;
private boolean selected;
private boolean hover;
/**
* Constructor for ListElement.
*
* @param parent
* the parent Composite.
* @param tab
* the tab item for the element.
* @param index
* the index in the list.
*/
public ListElement(Composite parent, final ITabItem tab, int index) {
super(parent, SWT.NO_FOCUS);
this.tab = tab;
hover = false;
selected = false;
this.index = index;
addPaintListener(new PaintListener() {
public void paintControl(PaintEvent e) {
paint(e);
}
});
addMouseListener(new MouseAdapter() {
public void mouseUp(MouseEvent e) {
if (!selected) {
select(getIndex(ListElement.this));
/*
* We set focus to the tabbed property composite so that
* focus is moved to the appropriate widget in the
* section.
*/
Composite tabbedPropertyComposite = getParent();
while (!(tabbedPropertyComposite instanceof FeaturePanelComposite)) {
tabbedPropertyComposite = tabbedPropertyComposite
.getParent();
}
tabbedPropertyComposite.setFocus();
}
}
});
addMouseMoveListener(new MouseMoveListener() {
public void mouseMove(MouseEvent e) {
if (!hover) {
hover = true;
redraw();
}
}
});
addMouseTrackListener(new MouseTrackAdapter() {
public void mouseExit(MouseEvent e) {
hover = false;
redraw();
}
});
}
/**
* Set selected value for this element.
*
* @param selected
* the selected value.
*/
public void setSelected(boolean selected) {
this.selected = selected;
redraw();
}
/**
* Paint the element.
*
* @param e
* the paint event.
*/
private void paint(PaintEvent e) {
/*
* draw the top two lines of the tab, same for selected, hover and
* default
*/
Rectangle bounds = getBounds();
e.gc.setForeground(widgetNormalShadow);
e.gc.drawLine(0, 0, bounds.width - 1, 0);
e.gc.setForeground(listBackground);
e.gc.drawLine(0, 1, bounds.width - 1, 1);
/* draw the fill in the tab */
if (selected) {
e.gc.setBackground(listBackground);
e.gc.fillRectangle(0, 2, bounds.width, bounds.height - 1);
} else if (hover && tab.isIndented()) {
e.gc.setBackground(indentedHoverBackground);
e.gc.fillRectangle(0, 2, bounds.width - 1, bounds.height - 1);
} else if (hover) {
e.gc.setForeground(hoverGradientStart);
e.gc.setBackground(hoverGradientEnd);
e.gc.fillGradientRectangle(0, 2, bounds.width - 1,
bounds.height - 1, true);
} else if (tab.isIndented()) {
e.gc.setBackground(indentedDefaultBackground);
e.gc.fillRectangle(0, 2, bounds.width - 1, bounds.height - 1);
} else {
e.gc.setForeground(defaultGradientStart);
e.gc.setBackground(defaultGradientEnd);
e.gc.fillGradientRectangle(0, 2, bounds.width - 1,
bounds.height - 1, true);
}
if (!selected) {
e.gc.setForeground(widgetNormalShadow);
e.gc.drawLine(bounds.width - 1, 1, bounds.width - 1,
bounds.height + 1);
}
int textIndent = INDENT;
FontMetrics fm = e.gc.getFontMetrics();
int height = fm.getHeight();
int textMiddle = (bounds.height - height) / 2;
if (selected && tab.getImage() != null
&& !tab.getImage().isDisposed()) {
/* draw the icon for the selected tab */
if (tab.isIndented()) {
textIndent = textIndent + INDENT;
} else {
textIndent = textIndent - 3;
}
e.gc.drawImage(tab.getImage(), textIndent, textMiddle - 1);
textIndent = textIndent + 16 + 5;
} else if (tab.isIndented()) {
textIndent = textIndent + INDENT;
}
/* draw the text */
e.gc.setForeground(widgetForeground);
if (selected) {
/* selected tab is bold font */
e.gc.setFont(JFaceResources.getFontRegistry().getBold(
JFaceResources.DEFAULT_FONT));
}
e.gc.drawText(tab.getText(), textIndent, textMiddle, true);
if (((FeaturePanelList) getParent()).focus && selected) {
/* draw a line if the tab has focus */
Point point = e.gc.textExtent(tab.getText());
e.gc.drawLine(textIndent, bounds.height - 4, textIndent
+ point.x, bounds.height - 4);
}
/* draw the bottom line on the tab for selected and default */
if (!hover) {
e.gc.setForeground(listBackground);
e.gc.drawLine(0, bounds.height - 1, bounds.width - 2,
bounds.height - 1);
}
}
/**
* Get the tab item.
*
* @return the tab item.
*/
public ITabItem getTabItem() {
return tab;
}
public String toString() {
return tab.getText();
}
}
/**
* The top navigation element in the tabbed property list. It looks like a
* scroll button when scrolling is needed or is just a spacer when no
* scrolling is required.
*/
public class TopNavigationElement extends Canvas {
/**
* Constructor for TopNavigationElement.
*
* @param parent
* the parent Composite.
*/
public TopNavigationElement(Composite parent) {
super(parent, SWT.NO_FOCUS);
addPaintListener(new PaintListener() {
public void paintControl(PaintEvent e) {
paint(e);
}
});
addMouseListener(new MouseAdapter() {
public void mouseUp(MouseEvent e) {
if (isUpScrollRequired()) {
bottomVisibleIndex--;
if (topVisibleIndex != 0) {
topVisibleIndex--;
}
layoutTabs();
topNavigationElement.redraw();
bottomNavigationElement.redraw();
}
}
});
}
/**
* Paint the element.
*
* @param e
* the paint event.
*/
private void paint(PaintEvent e) {
e.gc.setBackground(widgetBackground);
e.gc.setForeground(widgetForeground);
Rectangle bounds = getBounds();
if (elements.length != 0) {
e.gc.fillRectangle(0, 0, bounds.width, bounds.height);
e.gc.setForeground(widgetNormalShadow);
e.gc.drawLine(bounds.width - 1, 0, bounds.width - 1,
bounds.height - 1);
} else {
e.gc.setBackground(listBackground);
e.gc.fillRectangle(0, 0, bounds.width, bounds.height);
int textIndent = INDENT;
FontMetrics fm = e.gc.getFontMetrics();
int height = fm.getHeight();
int textMiddle = (bounds.height - height) / 2;
e.gc.setForeground(widgetForeground);
String properties_not_available = "Attributes are not available";
e.gc.drawText(properties_not_available, textIndent, textMiddle);
}
if (isUpScrollRequired()) {
e.gc.setForeground(widgetDarkShadow);
int middle = bounds.width / 2;
e.gc.drawLine(middle + 1, 3, middle + 5, 7);
e.gc.drawLine(middle, 3, middle - 4, 7);
e.gc.drawLine(middle - 3, 7, middle + 4, 7);
e.gc.setForeground(listBackground);
e.gc.drawLine(middle, 4, middle + 1, 4);
e.gc.drawLine(middle - 1, 5, middle + 2, 5);
e.gc.drawLine(middle - 2, 6, middle + 3, 6);
e.gc.setForeground(widgetNormalShadow);
e.gc.drawLine(0, 0, bounds.width - 2, 0);
e.gc.setForeground(navigationElementShadowStroke);
e.gc.drawLine(0, 1, bounds.width - 2, 1);
e.gc.drawLine(0, bounds.height - 1, bounds.width - 2,
bounds.height - 1);
}
}
}
/**
* The top navigation element in the feature panel list. It looks like a
* scroll button when scrolling is needed or is just a spacer when no
* scrolling is required.
*/
public class BottomNavigationElement extends Canvas {
/**
* Constructor for BottomNavigationElement.
*
* @param parent
* the parent Composite.
*/
public BottomNavigationElement(Composite parent) {
super(parent, SWT.NO_FOCUS);
addPaintListener(new PaintListener() {
public void paintControl(PaintEvent e) {
paint(e);
}
});
addMouseListener(new MouseAdapter() {
public void mouseUp(MouseEvent e) {
if (isDownScrollRequired()) {
topVisibleIndex++;
if (bottomVisibleIndex != elements.length - 1) {
bottomVisibleIndex++;
}
layoutTabs();
topNavigationElement.redraw();
bottomNavigationElement.redraw();
}
}
});
}
/**
* Paint the element.
*
* @param e
* the paint event.
*/
private void paint(PaintEvent e) {
e.gc.setBackground(widgetBackground);
e.gc.setForeground(widgetForeground);
Rectangle bounds = getBounds();
if (elements.length != 0) {
e.gc.fillRectangle(0, 0, bounds.width, bounds.height);
e.gc.setForeground(widgetNormalShadow);
e.gc.drawLine(bounds.width - 1, 0, bounds.width - 1,
bounds.height - 1);
e.gc.drawLine(0, 0, bounds.width - 1, 0);
e.gc.setForeground(bottomNavigationElementShadowStroke1);
e.gc.drawLine(0, 1, bounds.width - 2, 1);
e.gc.setForeground(bottomNavigationElementShadowStroke2);
e.gc.drawLine(0, 2, bounds.width - 2, 2);
} else {
e.gc.setBackground(listBackground);
e.gc.fillRectangle(0, 0, bounds.width, bounds.height);
}
if (isDownScrollRequired()) {
e.gc.setForeground(widgetDarkShadow);
int middle = bounds.width / 2;
int bottom = bounds.height - 3;
e.gc.drawLine(middle + 1, bottom, middle + 5, bottom - 4);
e.gc.drawLine(middle, bottom, middle - 4, bottom - 4);
e.gc.drawLine(middle - 3, bottom - 4, middle + 4, bottom - 4);
e.gc.setForeground(listBackground);
e.gc.drawLine(middle, bottom - 1, middle + 1, bottom - 1);
e.gc.drawLine(middle - 1, bottom - 2, middle + 2, bottom - 2);
e.gc.drawLine(middle - 2, bottom - 3, middle + 3, bottom - 3);
e.gc.setForeground(widgetNormalShadow);
e.gc.drawLine(0, bottom - 7, bounds.width - 2, bottom - 7);
e.gc.setForeground(navigationElementShadowStroke);
e.gc.drawLine(0, bottom + 2, bounds.width - 2, bottom + 2);
e.gc.drawLine(0, bottom - 6, bounds.width - 2, bottom - 6);
}
}
}
/**
* Constructor for FeaturePanelList.
*
* @param parent
* the parent widget.
* @param factory
* the widget factory.
*/
public FeaturePanelList(Composite parent,
FeaturePanelWidgetFactory factory) {
super(parent, SWT.NO_FOCUS);
this.factory = factory;
removeAll();
setLayout(new FormLayout());
initColours();
initAccessible();
topNavigationElement = new TopNavigationElement(this);
bottomNavigationElement = new BottomNavigationElement(this);
this.addFocusListener(new FocusListener() {
public void focusGained(FocusEvent e) {
focus = true;
int i = getSelectionIndex();
if (i >= 0) {
elements[i].redraw();
}
}
public void focusLost(FocusEvent e) {
focus = false;
int i = getSelectionIndex();
if (i >= 0) {
elements[i].redraw();
}
}
});
this.addControlListener(new ControlAdapter() {
public void controlResized(ControlEvent e) {
computeTopAndBottomTab();
}
});
this.addTraverseListener(new TraverseListener() {
public void keyTraversed(TraverseEvent e) {
if (e.detail == SWT.TRAVERSE_ARROW_PREVIOUS
|| e.detail == SWT.TRAVERSE_ARROW_NEXT) {
int nMax = elements.length - 1;
int nCurrent = getSelectionIndex();
if (e.detail == SWT.TRAVERSE_ARROW_PREVIOUS) {
nCurrent -= 1;
nCurrent = Math.max(0, nCurrent);
} else if (e.detail == SWT.TRAVERSE_ARROW_NEXT) {
nCurrent += 1;
nCurrent = Math.min(nCurrent, nMax);
}
select(nCurrent);
redraw();
} else {
e.doit = true;
}
}
});
}
/**
* Calculate the number of tabs that will fit in the tab list composite.
*/
protected void computeTabsThatFitInComposite() {
tabsThatFitInComposite = Math
.round((getSize().y - 22) / getTabHeight());
if (tabsThatFitInComposite <= 0) {
tabsThatFitInComposite = 1;
}
}
/**
* Returns the element with the given index from this list viewer. Returns
* <code>null</code> if the index is out of range.
*
* @param index
* the zero-based index
* @return the element at the given index, or <code>null</code> if the
* index is out of range
*/
public Object getElementAt(int index) {
if (index >= 0 && index < elements.length) {
return elements[index];
}
return null;
}
/**
* Returns the zero-relative index of the item which is currently selected
* in the receiver, or -1 if no item is selected.
*
* @return the index of the selected item
*/
public int getSelectionIndex() {
return selectedElementIndex;
}
/**
* Removes all elements from this list.
*/
public void removeAll() {
if (elements != null) {
for (int i = 0; i < elements.length; i++) {
elements[i].dispose();
}
}
elements = ELEMENTS_EMPTY;
selectedElementIndex = NONE;
widestLabelIndex = NONE;
topVisibleIndex = NONE;
bottomVisibleIndex = NONE;
}
/**
* Sets the new list elements.
*
* @param children
*/
public void setElements(Object[] children) {
if (elements != ELEMENTS_EMPTY) {
removeAll();
}
elements = new ListElement[children.length];
if (children.length == 0) {
widestLabelIndex = NONE;
} else {
widestLabelIndex = 0;
for (int i = 0; i < children.length; i++) {
elements[i] = new ListElement(this, (ITabItem) children[i], i);
elements[i].setVisible(false);
elements[i].setLayoutData(null);
if (i != widestLabelIndex) {
String label = ((ITabItem) children[i]).getText();
int width = getTextDimension(label).x;
if (((ITabItem) children[i]).isIndented()) {
width = width + INDENT;
}
if (width > getTextDimension(((ITabItem) children[widestLabelIndex])
.getText()).x) {
widestLabelIndex = i;
}
}
}
}
computeTopAndBottomTab();
}
/**
* Selects one of the elements in the list.
*
* @param index
* the index of the element to select.
*/
protected void select(int index) {
if (getSelectionIndex() == index) {
/*
* this index is already selected.
*/
return;
}
if (index >= 0 && index < elements.length) {
int lastSelected = getSelectionIndex();
elements[index].setSelected(true);
selectedElementIndex = index;
if (lastSelected != NONE) {
elements[lastSelected].setSelected(false);
if (getSelectionIndex() != elements.length - 1) {
/*
* redraw the next tab to fix the border by calling
* setSelected()
*/
elements[getSelectionIndex() + 1].setSelected(false);
}
}
topNavigationElement.redraw();
bottomNavigationElement.redraw();
if (selectedElementIndex < topVisibleIndex
|| selectedElementIndex > bottomVisibleIndex) {
computeTopAndBottomTab();
}
}
notifyListeners(SWT.Selection, new Event());
}
/**
* Deselects all the elements in the list.
*/
public void deselectAll() {
if (getSelectionIndex() != NONE) {
elements[getSelectionIndex()].setSelected(false);
selectedElementIndex = NONE;
}
}
private int getIndex(ListElement element) {
return element.index;
}
public Point computeSize(int wHint, int hHint, boolean changed) {
Point result = super.computeSize(hHint, wHint, changed);
if (widestLabelIndex == -1) {
String properties_not_available = "Properties are not available.";
result.x = getTextDimension(properties_not_available).x + INDENT;
} else {
ITabItem widestTab = elements[widestLabelIndex].getTabItem();
int width = getTextDimension(widestTab.getText()).x + INDENT;
/*
* To anticipate for the icon placement we should always keep the
* space available after the label. So when the active tab includes
* an icon the width of the tab doesn't change.
*/
if (widestTab.getImage() != null) {
width = width + 16 + 4;
}
if (widestTab.isIndented()) {
width = width + 10;
}
/*
* Add 10 pixels to the right of the longest string as a margin.
*/
result.x = width + 10;
}
return result;
}
/**
* Get the dimensions of the provided string.
*
* @param text
* the string.
* @return the dimensions of the provided string.
*/
private Point getTextDimension(String text) {
GC gc = new GC(this);
gc.setFont(JFaceResources.getFontRegistry().getBold(
JFaceResources.DEFAULT_FONT));
Point point = gc.textExtent(text);
point.x++;
gc.dispose();
return point;
}
/**
* Initialize the colours used in the list.
*/
private void initColours() {
/*
* Colour 3 COLOR_LIST_BACKGROUND
*/
listBackground = Display.getCurrent().getSystemColor(
SWT.COLOR_LIST_BACKGROUND);
/*
* Colour 13 COLOR_WIDGET_BACKGROUND
*/
widgetBackground = Display.getCurrent().getSystemColor(
SWT.COLOR_WIDGET_BACKGROUND);
/*
* Colour 15 COLOR_WIDGET_DARK_SHADOW
*/
widgetDarkShadow = Display.getCurrent().getSystemColor(
SWT.COLOR_WIDGET_DARK_SHADOW);
/*
* Colour 16 COLOR_WIDGET_FOREGROUND
*/
widgetForeground = Display.getCurrent().getSystemColor(
SWT.COLOR_WIDGET_FOREGROUND);
/*
* Colour 19 COLOR_WIDGET_NORMAL_SHADOW
*/
widgetNormalShadow = Display.getCurrent().getSystemColor(
SWT.COLOR_WIDGET_NORMAL_SHADOW);
RGB infoBackground = Display.getCurrent().getSystemColor(
SWT.COLOR_INFO_BACKGROUND).getRGB();
RGB white = Display.getCurrent().getSystemColor(SWT.COLOR_WHITE)
.getRGB();
RGB black = Display.getCurrent().getSystemColor(SWT.COLOR_BLACK)
.getRGB();
/*
* gradient in the default tab: start colour WIDGET_NORMAL_SHADOW 100% +
* white 20% + INFO_BACKGROUND 60% end colour WIDGET_NORMAL_SHADOW 100% +
* INFO_BACKGROUND 40%
*/
defaultGradientStart = factory.getColors().createColor(
"TabbedPropertyList.defaultTabGradientStart", //$NON-NLS-1$
FormColors.blend(infoBackground, FormColors.blend(white,
widgetNormalShadow.getRGB(), 20), 60));
defaultGradientEnd = factory.getColors().createColor(
"TabbedPropertyList.defaultTabGradientEnd", //$NON-NLS-1$
FormColors.blend(infoBackground, widgetNormalShadow.getRGB(),
40));
navigationElementShadowStroke = factory.getColors().createColor(
"TabbedPropertyList.shadowStroke", //$NON-NLS-1$
FormColors.blend(white, widgetNormalShadow.getRGB(), 55));
bottomNavigationElementShadowStroke1 = factory.getColors().createColor(
"TabbedPropertyList.tabShadowStroke1", //$NON-NLS-1$
FormColors.blend(black, widgetBackground.getRGB(), 10));
bottomNavigationElementShadowStroke2 = factory.getColors().createColor(
"TabbedPropertyList.tabShadowStroke2", //$NON-NLS-1$
FormColors.blend(black, widgetBackground.getRGB(), 5));
/*
* gradient in the hover tab: start colour WIDGET_BACKGROUND 100% +
* white 20% end colour WIDGET_BACKGROUND 100% + WIDGET_NORMAL_SHADOW
* 10%
*/
hoverGradientStart = factory.getColors().createColor(
"TabbedPropertyList.hoverBackgroundGradientStart", //$NON-NLS-1$
FormColors.blend(white, widgetBackground.getRGB(), 20));
hoverGradientEnd = factory.getColors().createColor(
"TabbedPropertyList.hoverBackgroundGradientEnd", //$NON-NLS-1$
FormColors.blend(widgetNormalShadow.getRGB(), widgetBackground
.getRGB(), 10));
indentedDefaultBackground = factory.getColors().createColor(
"TabbedPropertyList.indentedDefaultBackground", //$NON-NLS-1$
FormColors.blend(white, widgetBackground.getRGB(), 10));
indentedHoverBackground = factory.getColors().createColor(
"TabbedPropertyList.indentedHoverBackground", //$NON-NLS-1$
FormColors.blend(white, widgetBackground.getRGB(), 75));
}
/**
* Get the height of a tab. The height of the tab is the height of the text
* plus buffer.
*
* @return the height of a tab.
*/
private int getTabHeight() {
int tabHeight = getTextDimension("").y + INDENT; //$NON-NLS-1$
if (tabsThatFitInComposite == 1) {
/*
* if only one tab will fix, reduce the size of the tab height so
* that the navigation elements fit.
*/
int ret = getBounds().height - 20;
return (ret > tabHeight) ? tabHeight
: (ret < 5) ? 5
: ret;
}
return tabHeight;
}
/**
* Determine if a downward scrolling is required.
*
* @return true if downward scrolling is required.
*/
private boolean isDownScrollRequired() {
return elements.length > tabsThatFitInComposite
&& bottomVisibleIndex != elements.length - 1;
}
/**
* Determine if an upward scrolling is required.
*
* @return true if upward scrolling is required.
*/
private boolean isUpScrollRequired() {
return elements.length > tabsThatFitInComposite && topVisibleIndex != 0;
}
/**
* Based on available space, figure out the top and bottom tabs in the list.
*/
private void computeTopAndBottomTab() {
computeTabsThatFitInComposite();
if (elements.length == 0) {
/*
* no tabs to display.
*/
topVisibleIndex = 0;
bottomVisibleIndex = 0;
} else if (tabsThatFitInComposite >= elements.length) {
/*
* all the tabs fit.
*/
topVisibleIndex = 0;
bottomVisibleIndex = elements.length - 1;
} else if (getSelectionIndex() == NONE) {
/*
* there is no selected tab yet, assume that tab one would
* be selected for now.
*/
topVisibleIndex = 0;
bottomVisibleIndex = tabsThatFitInComposite - 1;
} else if (getSelectionIndex() + tabsThatFitInComposite > elements.length) {
/*
* the selected tab is near the bottom.
*/
bottomVisibleIndex = elements.length - 1;
topVisibleIndex = bottomVisibleIndex - tabsThatFitInComposite + 1;
} else {
/*
* the selected tab is near the top.
*/
topVisibleIndex = selectedElementIndex;
bottomVisibleIndex = selectedElementIndex + tabsThatFitInComposite
- 1;
}
layoutTabs();
}
/**
* Layout the tabs.
*/
private void layoutTabs() {
//System.out.println("TabFit " + tabsThatFitInComposite + " length "
// + elements.length + " top " + topVisibleIndex + " bottom "
// + bottomVisibleIndex);
if (tabsThatFitInComposite == NONE || elements.length == 0) {
FormData formData = new FormData();
formData.left = new FormAttachment(0, 0);
formData.right = new FormAttachment(100, 0);
formData.top = new FormAttachment(0, 0);
formData.height = getTabHeight();
topNavigationElement.setLayoutData(formData);
formData = new FormData();
formData.left = new FormAttachment(0, 0);
formData.right = new FormAttachment(100, 0);
formData.top = new FormAttachment(topNavigationElement, 0);
formData.bottom = new FormAttachment(100, 0);
bottomNavigationElement.setLayoutData(formData);
} else {
FormData formData = new FormData();
formData.left = new FormAttachment(0, 0);
formData.right = new FormAttachment(100, 0);
formData.top = new FormAttachment(0, 0);
formData.height = 10;
topNavigationElement.setLayoutData(formData);
/*
* use nextElement to attach the layout to the previous canvas
* widget in the list.
*/
Canvas nextElement = topNavigationElement;
for (int i = 0; i < elements.length; i++) {
//System.out.print(i + " [" + elements[i].getText() + "]");
if (i < topVisibleIndex || i > bottomVisibleIndex) {
/*
* this tab is not visible
*/
elements[i].setLayoutData(null);
elements[i].setVisible(false);
} else {
/*
* this tab is visible.
*/
//System.out.print(" visible");
formData = new FormData();
formData.height = getTabHeight();
formData.left = new FormAttachment(0, 0);
formData.right = new FormAttachment(100, 0);
formData.top = new FormAttachment(nextElement, 0);
nextElement = elements[i];
elements[i].setLayoutData(formData);
elements[i].setVisible(true);
}
//if (i == selectedElementIndex) {
// System.out.print(" selected");
//}
//System.out.println("");
}
formData = new FormData();
formData.left = new FormAttachment(0, 0);
formData.right = new FormAttachment(100, 0);
formData.top = new FormAttachment(nextElement, 0);
formData.bottom = new FormAttachment(100, 0);
formData.height = 10;
bottomNavigationElement.setLayoutData(formData);
}
//System.out.println("");
// layout so that we have enough space for the new labels
Composite grandparent = getParent().getParent();
grandparent.layout(true);
layout(true);
}
/**
* Initialize the accessibility adapter.
*/
private void initAccessible() {
final Accessible accessible = getAccessible();
accessible.addAccessibleListener(new AccessibleAdapter() {
public void getName(AccessibleEvent e) {
if (getSelectionIndex() != NONE) {
e.result = elements[getSelectionIndex()].getTabItem()
.getText();
}
}
public void getHelp(AccessibleEvent e) {
if (getSelectionIndex() != NONE) {
e.result = elements[getSelectionIndex()].getTabItem()
.getText();
}
}
});
accessible.addAccessibleControlListener(new AccessibleControlAdapter() {
public void getChildAtPoint(AccessibleControlEvent e) {
Point pt = toControl(new Point(e.x, e.y));
e.childID = (getBounds().contains(pt)) ? ACC.CHILDID_SELF
: ACC.CHILDID_NONE;
}
public void getLocation(AccessibleControlEvent e) {
if (getSelectionIndex() != NONE) {
Rectangle location = elements[getSelectionIndex()]
.getBounds();
Point pt = toDisplay(new Point(location.x, location.y));
e.x = pt.x;
e.y = pt.y;
e.width = location.width;
e.height = location.height;
}
}
public void getChildCount(AccessibleControlEvent e) {
e.detail = 0;
}
public void getRole(AccessibleControlEvent e) {
e.detail = ACC.ROLE_TABITEM;
}
public void getState(AccessibleControlEvent e) {
e.detail = ACC.STATE_NORMAL | ACC.STATE_SELECTABLE
| ACC.STATE_SELECTED | ACC.STATE_FOCUSED
| ACC.STATE_FOCUSABLE;
}
});
addListener(SWT.Selection, new Listener() {
public void handleEvent(Event event) {
if (isFocusControl()) {
accessible.setFocus(ACC.CHILDID_SELF);
}
}
});
addListener(SWT.FocusIn, new Listener() {
public void handleEvent(Event event) {
accessible.setFocus(ACC.CHILDID_SELF);
}
});
}
}