/*******************************************************************************
* Copyright (c) 2000, 2015 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
*******************************************************************************/
package org.eclipse.jface.viewers;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.TableTree;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.FontMetrics;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.ImageData;
import org.eclipse.swt.graphics.PaletteData;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.ColorDialog;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Layout;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.Tree;
/**
* A cell editor that manages a color field.
* The cell editor's value is the color (an SWT <code>RBG</code>).
* <p>
* This class may be instantiated; it is not intended to be subclassed.
* </p>
* @noextend This class is not intended to be subclassed by clients.
*/
public class ColorCellEditor extends DialogCellEditor {
/**
* The default extent in pixels.
*/
private static final int DEFAULT_EXTENT = 16;
/**
* Gap between between image and text in pixels.
*/
private static final int GAP = 6;
/**
* The composite widget containing the color and RGB label widgets
*/
private Composite composite;
/**
* The label widget showing the current color.
*/
private Label colorLabel;
/**
* The label widget showing the RGB values.
*/
private Label rgbLabel;
/**
* The image.
*/
private Image image;
/**
* Internal class for laying out this cell editor.
*/
private class ColorCellLayout extends Layout {
@Override
public Point computeSize(Composite editor, int wHint, int hHint,
boolean force) {
if (wHint != SWT.DEFAULT && hHint != SWT.DEFAULT) {
return new Point(wHint, hHint);
}
Point colorSize = colorLabel.computeSize(SWT.DEFAULT, SWT.DEFAULT,
force);
Point rgbSize = rgbLabel.computeSize(SWT.DEFAULT, SWT.DEFAULT,
force);
return new Point(colorSize.x + GAP + rgbSize.x, Math.max(
colorSize.y, rgbSize.y));
}
@Override
public void layout(Composite editor, boolean force) {
Rectangle bounds = editor.getClientArea();
Point colorSize = colorLabel.computeSize(SWT.DEFAULT, SWT.DEFAULT,
force);
Point rgbSize = rgbLabel.computeSize(SWT.DEFAULT, SWT.DEFAULT,
force);
int ty = (bounds.height - rgbSize.y) / 2;
if (ty < 0) {
ty = 0;
}
colorLabel.setBounds(-1, 0, colorSize.x, colorSize.y);
rgbLabel.setBounds(colorSize.x + GAP - 1, ty, bounds.width
- colorSize.x - GAP, bounds.height);
}
}
/**
* Creates a new color cell editor parented under the given control.
* The cell editor value is black (<code>RGB(0,0,0)</code>) initially, and has no
* validator.
*
* @param parent the parent control
*/
public ColorCellEditor(Composite parent) {
this(parent, SWT.NONE);
}
/**
* Creates a new color cell editor parented under the given control.
* The cell editor value is black (<code>RGB(0,0,0)</code>) initially, and has no
* validator.
*
* @param parent the parent control
* @param style the style bits
* @since 2.1
*/
public ColorCellEditor(Composite parent, int style) {
super(parent, style);
doSetValue(new RGB(0, 0, 0));
}
/**
* Creates and returns the color image data for the given control
* and RGB value. The image's size is either the control's item extent
* or the cell editor's default extent, which is 16 pixels square.
*
* @param w the control
* @param color the color
*/
private ImageData createColorImage(Control w, RGB color) {
GC gc = new GC(w);
FontMetrics fm = gc.getFontMetrics();
int size = fm.getAscent();
gc.dispose();
int indent = 6;
int extent = DEFAULT_EXTENT;
if (w instanceof Table) {
extent = ((Table) w).getItemHeight() - 1;
} else if (w instanceof Tree) {
extent = ((Tree) w).getItemHeight() - 1;
} else if (w instanceof TableTree) {
extent = ((TableTree) w).getItemHeight() - 1;
}
if (size > extent) {
size = extent;
}
int width = indent + size;
int height = extent;
int xoffset = indent;
int yoffset = (height - size) / 2;
RGB black = new RGB(0, 0, 0);
PaletteData dataPalette = new PaletteData(new RGB[] { black, black,
color });
ImageData data = new ImageData(width, height, 4, dataPalette);
data.transparentPixel = 0;
int end = size - 1;
for (int y = 0; y < size; y++) {
for (int x = 0; x < size; x++) {
if (x == 0 || y == 0 || x == end || y == end) {
data.setPixel(x + xoffset, y + yoffset, 1);
} else {
data.setPixel(x + xoffset, y + yoffset, 2);
}
}
}
return data;
}
@Override
protected Control createContents(Composite cell) {
Color bg = cell.getBackground();
composite = new Composite(cell, getStyle());
composite.setBackground(bg);
composite.setLayout(new ColorCellLayout());
colorLabel = new Label(composite, SWT.LEFT);
colorLabel.setBackground(bg);
rgbLabel = new Label(composite, SWT.LEFT);
rgbLabel.setBackground(bg);
rgbLabel.setFont(cell.getFont());
return composite;
}
@Override
public void dispose() {
if (image != null) {
image.dispose();
image = null;
}
super.dispose();
}
@Override
protected Object openDialogBox(Control cellEditorWindow) {
ColorDialog dialog = new ColorDialog(cellEditorWindow.getShell());
Object value = getValue();
if (value != null) {
dialog.setRGB((RGB) value);
}
value = dialog.open();
return dialog.getRGB();
}
@Override
protected void updateContents(Object value) {
RGB rgb = (RGB) value;
// XXX: We don't have a value the first time this method is called".
if (rgb == null) {
rgb = new RGB(0, 0, 0);
}
// XXX: Workaround for 1FMQ0P3: SWT:ALL - TableItem.setImage doesn't work if using the identical image."
if (image != null) {
image.dispose();
}
ImageData id = createColorImage(colorLabel.getParent().getParent(), rgb);
ImageData mask = id.getTransparencyMask();
image = new Image(colorLabel.getDisplay(), id, mask);
colorLabel.setImage(image);
rgbLabel
.setText("(" + rgb.red + "," + rgb.green + "," + rgb.blue + ")");//$NON-NLS-4$//$NON-NLS-3$//$NON-NLS-2$//$NON-NLS-1$
}
}