org.eclipse.jface.viewers.ViewerRow Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2006, 2009 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
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
* Tom Schindl - initial API and implementation
* - fix in bug: 166346,167325,174355,195908,198035,215069,227421
*******************************************************************************/
package org.eclipse.jface.viewers;
import java.io.Serializable;
import org.eclipse.jface.util.Policy;
//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.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Widget;
/**
* ViewerRow is the abstract superclass of the part that represents items in a
* Table or Tree. Implementors of {@link ColumnViewer} have to provide a
* concrete implementation for the underlying widget
*
* @since 1.0
*
*/
public abstract class ViewerRow implements Cloneable, Serializable {
/**
* Constant denoting the row above the current one (value is 1).
*
* @see #getNeighbor(int, boolean)
*/
public static final int ABOVE = 1;
/**
* Constant denoting the row below the current one (value is 2).
*
* @see #getNeighbor(int, boolean)
*/
public static final int BELOW = 2;
private static final String KEY_TEXT_LAYOUT = Policy.JFACE + "styled_label_key_"; //$NON-NLS-1$
private static final String KEY_TEXT_LAYOUT_0 = Policy.JFACE + "styled_label_key_0"; //$NON-NLS-1$
private static String[] cachedDataKeys;
/**
* Get the bounds of the entry at the columnIndex,
*
* @param columnIndex
* @return {@link Rectangle}
*/
public abstract Rectangle getBounds(int columnIndex);
/**
* Return the bounds for the whole item.
*
* @return {@link Rectangle}
*/
public abstract Rectangle getBounds();
/**
* Return the item for the receiver.
*
* @return {@link Widget}
*/
public abstract Widget getItem();
/**
* Return the number of columns for the receiver.
*
* @return the number of columns
*/
public abstract int getColumnCount();
/**
* Return the image at the columnIndex.
*
* @param columnIndex
* @return {@link Image} or null
*/
public abstract Image getImage(int columnIndex);
/**
* Set the image at the columnIndex
*
* @param columnIndex
* @param image
*/
public abstract void setImage(int columnIndex, Image image);
/**
* Get the text at the columnIndex.
*
* @param columnIndex
* @return {@link String}
*/
public abstract String getText(int columnIndex);
/**
* Set the text at the columnIndex
*
* @param columnIndex
* @param text
*/
public abstract void setText(int columnIndex, String text);
/**
* Get the background at the columnIndex,
*
* @param columnIndex
* @return {@link Color} or null
*/
public abstract Color getBackground(int columnIndex);
/**
* Set the background at the columnIndex.
*
* @param columnIndex
* @param color
*/
public abstract void setBackground(int columnIndex, Color color);
/**
* Get the foreground at the columnIndex.
*
* @param columnIndex
* @return {@link Color} or null
*/
public abstract Color getForeground(int columnIndex);
/**
* Set the foreground at the columnIndex.
*
* @param columnIndex
* @param color
*/
public abstract void setForeground(int columnIndex, Color color);
/**
* Get the font at the columnIndex.
*
* @param columnIndex
* @return {@link Font} or null
*/
public abstract Font getFont(int columnIndex);
/**
* Set the {@link Font} at the columnIndex.
*
* @param columnIndex
* @param font
*/
public abstract void setFont(int columnIndex, Font font);
/**
* Get the ViewerCell at point.
*
* @param point
* @return @return {@link ViewerCell} or null if the point is
* not in the bounds of a cell
*/
public ViewerCell getCell(Point point) {
int index = getColumnIndex(point);
return getCell(index);
}
/**
* Get the columnIndex of the point.
*
* @param point
* @return int or -1 if it cannot be found.
*/
public int getColumnIndex(Point point) {
int count = getColumnCount();
// If there are no columns the column-index is 0
if (count == 0) {
return 0;
}
for (int i = 0; i < count; i++) {
if (getBounds(i).contains(point)) {
return i;
}
}
return -1;
}
/**
* Get a ViewerCell for the column at index.
*
* @param column
* @return {@link ViewerCell} or null if the index is negative.
*/
public ViewerCell getCell(int column) {
if (column >= 0)
return new ViewerCell((ViewerRow) clone(), column, getElement());
return null;
}
/**
* Get the Control for the receiver.
*
* @return {@link Control}
*/
public abstract Control getControl();
/**
* Returns a neighboring row, or null if no neighbor exists in
* the given direction. If sameLevel is true, only
* sibling rows (under the same parent) will be considered.
*
* @param direction
* the direction {@link #BELOW} or {@link #ABOVE}
*
* @param sameLevel
* if true, search only within sibling rows
* @return the row above/below, or null if not found
*/
public abstract ViewerRow getNeighbor(int direction, boolean sameLevel);
/**
* The tree path used to identify an element by the unique path
*
* @return the path
*/
public abstract TreePath getTreePath();
public abstract Object clone();
/**
* @return the model element
*/
public abstract Object getElement();
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result
+ ((getItem() == null) ? 0 : getItem().hashCode());
return result;
}
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
final ViewerRow other = (ViewerRow) obj;
if (getItem() == null) {
if (other.getItem() != null)
return false;
} else if (!getItem().equals(other.getItem()))
return false;
return true;
}
/**
* The cell at the current index (as shown in the UI). This can be different
* to the original index when columns are reordered.
*
* @param visualIndex
* the current index (as shown in the UI)
* @return the cell at the currently visible index
*/
ViewerCell getCellAtVisualIndex(int visualIndex) {
return getCell(getCreationIndex(visualIndex));
}
/**
* Translate the original column index to the actual one.
*
* Because of backwards API compatibility the default implementation
* returns the original index. Implementators of {@link ColumnViewer} should
* overwrite this method if their widget supports reordered columns
*
*
* @param creationIndex
* the original index
* @return the current index (as shown in the UI)
* @since 1.1
*/
protected int getVisualIndex(int creationIndex) {
return creationIndex;
}
/**
* Translate the current column index (as shown in the UI) to the original
* one.
*
* Because of backwards API compatibility the default implementation
* returns the original index. Implementators of {@link ColumnViewer} should
* overwrite this method if their widget supports reordered columns
*
*
* @param visualIndex
* the current index (as shown in the UI)
* @return the original index
* @since 1.1
*/
protected int getCreationIndex(int visualIndex) {
return visualIndex;
}
/**
* The location and bounds of the area where the text is drawn depends on
* various things (image displayed, control with SWT.CHECK)
*
* @param index
* the column index
* @return the bounds of the of the text area. May return null
* if the underlying widget implementation doesn't provide this
* information
* @since 1.1
*/
public Rectangle getTextBounds(int index) {
return null;
}
/**
* Returns the location and bounds of the area where the image is drawn.
*
* @param index
* the column index
* @return the bounds of the of the image area. May return null
* if the underlying widget implementation doesn't provide this
* information
* @since 1.1
*/
public Rectangle getImageBounds(int index) {
return null;
}
// RAP [rh] StyleRange
// /**
// * Set the style ranges to be applied on the text label at the column index
// * Note: Requires {@link StyledCellLabelProvider} with owner draw enabled.
// *
// * @param columnIndex
// * the index of the column
// * @param styleRanges
// * the styled ranges
// *
// * @since 3.4
// */
// public void setStyleRanges(int columnIndex, StyleRange[] styleRanges) {
// getItem().setData(getStyleRangesDataKey(columnIndex), styleRanges);
// }
//
// /**
// * @param columnIndex
// * @return
// */
// private String getStyleRangesDataKey(int columnIndex) {
// if (columnIndex == 0)
// return KEY_TEXT_LAYOUT_0;
//
// if (cachedDataKeys == null) {
// int size = Math.max(10, columnIndex + 1);
// cachedDataKeys= new String[size];
// for (int i = 1; i < cachedDataKeys.length; i++) {
// cachedDataKeys[i] = KEY_TEXT_LAYOUT + i;
// }
// } else if (columnIndex >= cachedDataKeys.length) {
// String[] newCachedDataKeys = new String[columnIndex + 1];
// System.arraycopy(cachedDataKeys, 0, newCachedDataKeys, 0, cachedDataKeys.length);
// for (int i = cachedDataKeys.length; i < newCachedDataKeys.length; i++) {
// newCachedDataKeys[i] = KEY_TEXT_LAYOUT + i;
// }
// cachedDataKeys = newCachedDataKeys;
// }
// return cachedDataKeys[columnIndex];
// }
//
// /**
// * Returns the style ranges to be applied on the text label at the column
// * index or null if no style ranges have been set.
// *
// * @param columnIndex
// * the index of the column
// * @return styleRanges the styled ranges
// *
// * @since 3.4
// */
// public StyleRange[] getStyleRanges(int columnIndex) {
// return (StyleRange[]) getItem().getData(getStyleRangesDataKey(columnIndex));
// }
int getWidth(int columnIndex) {
return getBounds(columnIndex).width;
}
/**
* Scrolls the cell at this index into view
*
* Because of backwards API compatibility the default implementation is a
* no-op. Implementators of {@link ColumnViewer} should overwrite this
* method if their widget supports reordered columns
*
*
* @param columnIndex
* the column index
* @return return true when the cell is scrolled into view
* @since 1.3
*/
protected boolean scrollCellIntoView(int columnIndex) {
return false;
}
/**
* Returns true if the column with the given index is visible
*
* @param columnIndex
* the column index
*
* @return true if the column is visible
* @since 1.3
*/
protected boolean isColumnVisible(int columnIndex) {
return getWidth(columnIndex) > 0;
}
}