org.eclipse.jface.viewers.ViewerCell Maven / Gradle / Ivy
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/*******************************************************************************
* Copyright (c) 2006, 2015 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
* Tom Schindl - initial API and implementation
* - fix in bug: 195908,198035,215069,215735,227421
*******************************************************************************/
package org.eclipse.jface.viewers;
import java.util.Objects;
import org.eclipse.swt.custom.StyleRange;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Item;
import org.eclipse.swt.widgets.Widget;
/**
* The ViewerCell is the JFace representation of a cell entry in a ViewerRow.
*
* @since 3.3
*/
public class ViewerCell {
private final int columnIndex;
private final ViewerRow row;
private final Object element;
/**
* Constant denoting the cell above current one (value is 1).
*/
public static final int ABOVE = 1;
/**
* Constant denoting the cell below current one (value is 2).
*/
public static final int BELOW = 1 << 1;
/**
* Constant denoting the cell to the left of the current one (value is 4).
*/
public static final int LEFT = 1 << 2;
/**
* Constant denoting the cell to the right of the current one (value is 8).
*/
public static final int RIGHT = 1 << 3;
/**
* Create a new instance of the receiver on the row.
*/
ViewerCell(ViewerRow row, int columnIndex, Object element) {
Objects.requireNonNull(row);
this.row = row;
this.columnIndex = columnIndex;
this.element = element;
}
/**
* Get the index of the cell.
*
* @return the index
*/
public int getColumnIndex() {
return columnIndex;
}
/**
* Get the bounds of the cell.
*
* @return {@link Rectangle}
*/
public Rectangle getBounds() {
return row.getBounds(columnIndex);
}
/**
* Get the element this row represents.
*
* @return {@link Object}
*/
public Object getElement() {
if (element != null) {
return element;
}
if (row != null) {
return row.getElement();
}
return null;
}
/**
* Return the text for the cell.
*
* @return {@link String}
*/
public String getText() {
return row.getText(columnIndex);
}
/**
* Return the Image for the cell.
*
* @return {@link Image} or null
*/
public Image getImage() {
return row.getImage(columnIndex);
}
/**
* Set the background color of the cell.
*
* @param background color to set
*/
public void setBackground(Color background) {
row.setBackground(columnIndex, background);
}
/**
* Set the foreground color of the cell.
*
* @param foreground color to set
*/
public void setForeground(Color foreground) {
row.setForeground(columnIndex, foreground);
}
/**
* Set the font of the cell.
*
* @param font font to set
*/
public void setFont(Font font) {
row.setFont(columnIndex, font);
}
/**
* Set the text for the cell.
*
* @param text text to set
*/
public void setText(String text) {
row.setText(columnIndex, text);
}
/**
* Set the Image for the cell.
*
* @param image image to set
*/
public void setImage(Image image) {
row.setImage(columnIndex, image);
}
/**
* Set the style ranges to be applied on the text label Note: Requires
* {@link StyledCellLabelProvider} with owner draw enabled.
*
* @param styleRanges
* the styled ranges
*
* @since 3.4
*/
public void setStyleRanges(StyleRange[] styleRanges) {
row.setStyleRanges(columnIndex, styleRanges);
}
/**
* Returns the style ranges to be applied on the text label or
* null if no style ranges have been set.
*
* @return styleRanges the styled ranges
*
* @since 3.4
*/
public StyleRange[] getStyleRanges() {
return row.getStyleRanges(columnIndex);
}
/**
* Return the item for the receiver.
*
* @return {@link Item}
*/
public Widget getItem() {
return row.getItem();
}
/**
* Get the control for this cell.
*
* @return {@link Control}
*/
public Control getControl() {
return row.getControl();
}
/**
* Get the current index. This can be different from the original index when
* columns are reordered
*
* @return the current index (as shown in the UI)
* @since 3.4
*/
public int getVisualIndex() {
return row.getVisualIndex(getColumnIndex());
}
/**
* Returns the specified neighbor of this cell, or null if no
* neighbor exists in the given direction. Direction constants can be
* combined by bitwise OR; for example, this method will return the cell to
* the upper-left of the current cell by passing {@link #ABOVE} |
* {@link #LEFT}. If sameLevel is true, only cells
* in sibling rows (under the same parent) will be considered.
*
* @param directionMask
* the direction mask used to identify the requested neighbor
* cell
* @param sameLevel
* if true, only consider cells from sibling rows
* @return the requested neighbor cell, or null if not found
*/
public ViewerCell getNeighbor(int directionMask, boolean sameLevel) {
ViewerRow row;
if ((directionMask & ABOVE) == ABOVE) {
row = this.row.getNeighbor(ViewerRow.ABOVE, sameLevel);
} else if ((directionMask & BELOW) == BELOW) {
row = this.row.getNeighbor(ViewerRow.BELOW, sameLevel);
} else {
row = this.row;
}
if (row != null) {
int columnIndex;
columnIndex = getVisualIndex();
int modifier = 0;
if ((directionMask & LEFT) == LEFT) {
modifier = -1;
} else if ((directionMask & RIGHT) == RIGHT) {
modifier = 1;
} else {
return row.getCellAtVisualIndex(columnIndex);
}
columnIndex += modifier;
if (columnIndex >= 0 && columnIndex < row.getColumnCount()) {
ViewerCell cell = row.getCellAtVisualIndex(columnIndex);
while (cell != null && columnIndex < row.getColumnCount() - 1 && columnIndex > 0) {
if (cell.isVisible()) {
break;
}
columnIndex += modifier;
cell = row.getCellAtVisualIndex(columnIndex);
}
return cell;
}
}
return null;
}
/**
* @return the row
*/
public ViewerRow getViewerRow() {
return row;
}
/**
* The location and bounds of the area where the text is drawn depends on
* various things (image displayed, control with SWT.CHECK)
*
* @return The bounds of the of the text area. May return null
* if the underlying widget implementation doesn't provide this
* information
* @since 3.4
*/
public Rectangle getTextBounds() {
return row.getTextBounds(columnIndex);
}
/**
* Returns the location and bounds of the area where the image is drawn
*
* @return The bounds of the of the image area. May return null
* if the underlying widget implementation doesn't provide this
* information
* @since 3.4
*/
public Rectangle getImageBounds() {
return row.getImageBounds(columnIndex);
}
/**
* Gets the foreground color of the cell.
*
* @return the foreground of the cell or null for the default
* foreground
*
* @since 3.4
*/
public Color getForeground() {
return row.getForeground(columnIndex);
}
/**
* Gets the background color of the cell.
*
* @return the background of the cell or null for the default
* background
*
* @since 3.4
*/
public Color getBackground() {
return row.getBackground(columnIndex);
}
/**
* Gets the font of the cell.
*
* @return the font of the cell or null for the default font
*
* @since 3.4
*/
public Font getFont() {
return row.getFont(columnIndex);
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + columnIndex;
return prime * result + Objects.hashCode(row);
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
final ViewerCell other = (ViewerCell) obj;
return columnIndex == other.columnIndex && Objects.equals(row, other.row);
}
private boolean isVisible() {
return row.isColumnVisible(columnIndex);
}
/**
* Scroll the cell into view
*
* @return true if the cell was scrolled into view
* @since 3.5
*/
public boolean scrollIntoView() {
return row.scrollCellIntoView(columnIndex);
}
}