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/*******************************************************************************
* Copyright (c) 2011 Google, Inc.
* 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
*
* Contributors:
* Google, Inc. - initial API and implementation
*******************************************************************************/
package org.eclipse.wb.internal.core.model.property.table;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.wb.internal.core.EnvironmentUtils;
import org.eclipse.wb.internal.core.model.property.Property;
import org.eclipse.wb.internal.core.utils.ui.GridLayoutFactory;
/**
* Helper class for displaying tooltips.
*
* @author scheglov_ke
* @coverage core.model.property.table
*/
class PropertyTableTooltipHelper implements IPropertyTooltipSite {
private final PropertyTable m_table;
private Shell m_tooltip;
////////////////////////////////////////////////////////////////////////////
//
// Constructor
//
////////////////////////////////////////////////////////////////////////////
public PropertyTableTooltipHelper(PropertyTable table) {
m_table = table;
m_table.addListener(SWT.MouseHover, new Listener() {
@Override
public void handleEvent(Event event) {
if (event.stateMask == 0) {
showTooltip();
}
}
});
m_table.addListener(SWT.MouseExit, new Listener() {
@Override
public void handleEvent(Event event) {
// check, may be cursor is now on tooltip, so ignore this MouseExit
{
Control control = Display.getCurrent().getCursorControl();
while (control != null) {
if (control == m_tooltip) {
return;
}
control = control.getParent();
}
}
// no, we should hide tooltip
hideTooltip();
}
});
}
////////////////////////////////////////////////////////////////////////////
//
// Access
//
////////////////////////////////////////////////////////////////////////////
private Property m_property;
private boolean m_onTitle;
private boolean m_onValue;
private int m_beginX;
private int m_endX;
private int m_y;
private int m_rowHeight;
/**
* {@link PropertyTable} call this method to inform that cursor location was changed.
*/
public void update(Property property,
boolean onTitle,
boolean onValue,
int beginX,
int endX,
int y,
int rowHeight) {
m_property = property;
m_onTitle = onTitle;
m_onValue = onValue;
m_beginX = beginX;
m_endX = endX;
m_y = y;
m_rowHeight = rowHeight;
}
////////////////////////////////////////////////////////////////////////////
//
// IPropertyTooltipSite
//
////////////////////////////////////////////////////////////////////////////
@Override
public PropertyTable getTable() {
return m_table;
}
@Override
public void hideTooltip() {
if (m_tooltip != null && !m_tooltip.isDisposed()) {
m_tooltip.dispose();
}
m_tooltip = null;
}
////////////////////////////////////////////////////////////////////////////
//
// Showing tooltip
//
////////////////////////////////////////////////////////////////////////////
private void showTooltip() {
hideTooltip();
// check for property
if (m_property == null) {
return;
}
//
if (m_onTitle) {
showTooltip(m_property.getAdapter(PropertyTooltipProvider.class), m_beginX, m_endX);
}
if (m_onValue) {
showTooltip(m_property.getEditor().getAdapter(PropertyTooltipProvider.class),
m_beginX, m_endX);
}
}
private void showTooltip(PropertyTooltipProvider provider, int startX, int endX) {
if (provider == null) {
return;
}
// create Shell
{
m_tooltip = new Shell(m_table.getShell(), SWT.NO_FOCUS | SWT.ON_TOP | SWT.TOOL | SWT.SINGLE);
configureColors(m_tooltip);
GridLayoutFactory.create(m_tooltip).noMargins();
}
// prepare control
Control control = provider.createTooltipControl(m_property, m_tooltip, endX - startX, this);
if (control == null) {
hideTooltip();
return;
}
// show Shell
{
// prepare tooltip location
Point tooltipLocation;
if (provider.getTooltipPosition() == PropertyTooltipProvider.ON) {
tooltipLocation = m_table.toDisplay(new Point(startX, m_y));
} else {
tooltipLocation = m_table.toDisplay(new Point(startX, m_y + m_rowHeight));
}
// set location/size and open
m_tooltip.setLocation(tooltipLocation.x, tooltipLocation.y);
// for non-windows systems the tooltip may have invalid tooltip bounds
// because some widget's API functions may fail if tooltip content is not visible
// ex., on MacOSX tree widget's items has zero bounds since they are not yet visible.
// the workaround is to preset tooltip size to big values before any computeSize called.
if (!EnvironmentUtils.IS_WINDOWS) {
m_tooltip.setSize(1000, 1000);
}
m_tooltip.setSize(m_tooltip.computeSize(SWT.DEFAULT, SWT.DEFAULT));
provider.show(m_tooltip);
}
}
////////////////////////////////////////////////////////////////////////////
//
// Utils
//
////////////////////////////////////////////////////////////////////////////
/**
* Sets given {@link Control} correct background/foreground for tooltips.
*/
private void configureColors(Control control) {
Display display = Display.getCurrent();
control.setForeground(display.getSystemColor(SWT.COLOR_INFO_FOREGROUND));
control.setBackground(display.getSystemColor(SWT.COLOR_INFO_BACKGROUND));
}
}
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