org.eclipse.rap.rwt.template.Cell Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2013, 2014 EclipseSource 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:
* EclipseSource - initial API and implementation
******************************************************************************/
package org.eclipse.rap.rwt.template;
import java.io.Serializable;
import org.eclipse.rap.json.JsonObject;
import org.eclipse.rap.rwt.internal.protocol.StylesUtil;
import org.eclipse.rap.rwt.internal.util.ParamCheck;
import org.eclipse.rap.rwt.remote.JsonMapping;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Font;
/**
* Defines a region in a template. A cell can display a part of a connected data item. This part is
* selected by the bindingIndex.
*
* For horizontal positioning, two of the the properties left, right, and
* width must be set. For vertical positioning, two properties out of top,
* bottom, and height are required.
*
*
* @since 2.2
*/
public abstract class Cell implements Serializable {
private static final String PROPERTY_TYPE = "type";
private static final String PROPERTY_LEFT = "left";
private static final String PROPERTY_TOP = "top";
private static final String PROPERTY_RIGHT = "right";
private static final String PROPERTY_BOTTOM = "bottom";
private static final String PROPERTY_WIDTH = "width";
private static final String PROPERTY_HEIGHT = "height";
private static final String PROPERTY_BINDING_INDEX = "bindingIndex";
private static final String PROPERTY_SELECTABLE = "selectable";
private static final String PROPERTY_NAME = "name";
private static final String PROPERTY_FOREGROUND = "foreground";
private static final String PROPERTY_BACKGROUND = "background";
private static final String PROPERTY_FONT = "font";
private static final String PROPERTY_H_ALIGNMENT = "horizontalAlignment";
private static final String PROPERTY_V_ALIGNMENT = "verticalAlignment";
private final String type;
private String name;
private int bindingIndex;
private boolean isSelectable;
private Color foreground;
private Color background;
private Font font;
private Position left;
private Position right;
private Position top;
private Position bottom;
private Integer width;
private Integer height;
private int horizontalAlignment = SWT.NONE;
private int verticalAlignment = SWT.NONE;
/**
* Constructs a new cell on the given template. Subclasses must provide a unique name.
*
* @param template the template that this cell will be part of, must not be null
* @param type a unique type string to identify the cell type, must not be null or
* empty
*/
public Cell( Template template, String type ) {
ParamCheck.notNull( template, "template" );
ParamCheck.notNullOrEmpty( type, "type" );
this.type = type;
bindingIndex = -1;
template.addCell( this );
}
String getType() {
return type;
}
/**
* Sets a name for this cell. This name is used to identify the cell in a selection event.
* If the cell is selectable, a selection event will have its text attribute set to
* this name.
*
* @return the cell itself, to enable method chaining
* @see #setSelectable(boolean)
* @see org.eclipse.swt.widgets.Event#text
*/
public T setName( String name ) {
ParamCheck.notNullOrEmpty( name, "name" );
this.name = name;
return getThis();
}
String getName() {
return name;
}
/**
* Sets the index that is used to select the part (e.g. text/image) from the connected data item
* to be displayed by this cell. A value of -1 indicates that the cell is not bound.
*
* @param index the index of the part to display
* @return the cell itself, to enable method chaining
*/
public T setBindingIndex( int index ) {
bindingIndex = index;
return getThis();
}
int getBindingIndex() {
return bindingIndex;
}
/**
* Enables cell selection. If set to true, clicking this cell will not select the
* item but still trigger a selection event on the control. This selection event will have its
* detail field set to RWT.CELL and it's text field set to the name
* of this cell. The default is false.
*
* @param selectable true to enable cell selection
* @return the cell itself, to enable method chaining
* @see #setName(String)
* @see org.eclipse.rap.rwt.RWT#CELL
*/
public T setSelectable( boolean selectable ) {
isSelectable = selectable;
return getThis();
}
boolean isSelectable() {
return isSelectable;
}
/**
* Sets the foreground color for this cell. The connected data item may override this color. If
* the argument is null, the widget's default foreground color will be used.
*
* @param color the foreground color, or null to use the default
* @return the cell itself, to enable method chaining
*/
public T setForeground( Color color ) {
foreground = color;
return getThis();
}
Color getForeground() {
return foreground;
}
/**
* Sets the background color for this cell. The connected data item may override this color. If
* the argument is null, the widget's default color will be used.
*
* @param color the background color, or null to use the default
* @return the cell itself, to enable method chaining
*/
public T setBackground( Color color ) {
this.background = color;
return getThis();
}
Color getBackground() {
return background;
}
/**
* Sets the font for this cell. The connected data item may override this font. If the argument is
* null, the widget's default font will be used.
*
* @param font a font, or null to use the default
* @return the cell itself, to enable method chaining
*/
public T setFont( Font font ) {
this.font = font;
return getThis();
}
Font getFont() {
return font;
}
/**
* Sets the position of the left edge of the cell.
*
* @param offset the distance from the left edge of the template in px
* @return the cell itself, to enable method chaining
* @throws IllegalStateException if both right and width are already set
*/
public T setLeft( int offset ) {
return setLeft( 0, offset );
}
/**
* Sets the position of the left edge of the cell.
*
* @param percentage the distance from the left edge of the template as a percentage of the
* template's width
* @param offset a fixed offset in px to add to the percentage
* @return the cell itself, to enable method chaining
* @throws IllegalStateException if both right and width are already set
* @since 2.3
*/
public T setLeft( float percentage, int offset ) {
checkHorizontalParameters( right, width );
checkPercentage( percentage );
left = new Position( percentage, offset );
return getThis();
}
Position getLeft() {
return left;
}
/**
* Sets the position of the right edge of the cell.
*
* @param offset the distance from the right edge of the template in px
* @return the cell itself, to enable method chaining
* @throws IllegalStateException if both left and width are already set
*/
public T setRight( int offset ) {
return setRight( 0, offset );
}
/**
* Sets the position of the right edge of the cell.
*
* @param percentage the distance from the right edge of the template as a percentage of the
* template's width
* @param offset a fixed offset in px to add to the percentage
* @return the cell itself, to enable method chaining
* @throws IllegalStateException if both left and width are already set
* @since 2.3
*/
public T setRight( float percentage, int offset ) {
checkHorizontalParameters( left, width );
checkPercentage( percentage );
this.right = new Position( percentage, offset );
return getThis();
}
Position getRight() {
return right;
}
/**
* Sets the position of the upper edge of the cell.
*
* @param offset the distance from the upper edge of the template in px
* @return the cell itself, to enable method chaining
* @throws IllegalStateException if both bottom and height are already set
*/
public T setTop( int offset ) {
return setTop( 0, offset );
}
/**
* Sets the position of the upper edge of the cell.
*
* @param percentage the distance from the right edge of the template as a percentage of the
* template's height
* @param offset a fixed offset in px to add to the percentage
* @return the cell itself, to enable method chaining
* @throws IllegalStateException if both bottom and height are already set
* @since 2.3
*/
public T setTop( float percentage, int offset ) {
checkVerticalParameters( bottom, height );
checkPercentage( percentage );
this.top = new Position( percentage, offset );
return getThis();
}
Position getTop() {
return top;
}
/**
* Sets the position of the lower edge of the cell.
*
* @param offset the distance from the lower edge of the template in px
* @return the cell itself, to enable method chaining
* @throws IllegalStateException if both top and height are already set
*/
public T setBottom( int offset ) {
return setBottom( 0, offset );
}
/**
* Sets the position of the lower edge of the cell.
*
* @param percentage the distance from the right edge of the template as a percentage of the
* template's height
* @param offset a fixed offset in px to add to the percentage
* @return the cell itself, to enable method chaining
* @throws IllegalStateException if both top and height are already set
* @since 2.3
*/
public T setBottom( float percentage, int offset ) {
checkVerticalParameters( top, height );
checkPercentage( percentage );
this.bottom = new Position( percentage, offset );
return getThis();
}
Position getBottom() {
return bottom;
}
/**
* Sets the width of the cell.
* A value of SWT.DEFAULT resets the width.
*
* @param width the width in px, must not be negative
* @return the cell itself, to enable method chaining
*/
public T setWidth( int width ) {
checkHorizontalParameters( left, right );
this.width = Integer.valueOf( width );
return getThis();
}
Integer getWidth() {
return width;
}
/**
* Sets the height of the cell.
* A value of SWT.DEFAULT resets the height.
*
* @param height the height in px, must not be negative
* @return the cell itself, to enable method chaining
*/
public T setHeight( int height ) {
checkVerticalParameters( top, bottom );
this.height = Integer.valueOf( height );
return getThis();
}
Integer getHeight() {
return height;
}
/**
* Defines how the content of this cell should be positioned horizontally.
*
* @param alignment the horizontal alignment, must be one of: SWT.BEGINNING (or SWT.LEFT),
* SWT.CENTER, SWT.END (or SWT.RIGHT)
* @return the cell itself, to enable method chaining
*/
public T setHorizontalAlignment( int alignment ) {
horizontalAlignment = alignment;
return getThis();
}
int getHorizontalAlignment() {
return horizontalAlignment;
}
/**
* Defines how the content of this cell should be positioned vertically.
*
* @param alignment the horizontal alignment, must be one of: SWT.BEGINNING (or SWT.TOP),
* SWT.CENTER, SWT.END (or SWT.BOTTOM)
* @return the cell itself, to enable method chaining
*/
public T setVerticalAlignment( int alignment ) {
verticalAlignment = alignment;
return getThis();
}
int getVerticalAlignment() {
return verticalAlignment;
}
/**
* Creates a JSON representation of this cell. Subclasses can override this method, but must call
* super and add additional attributes like this:
*
* protected JsonObject toJson() {
* JsonObject json = super.toJson();
* json.add( "foo", getFoo() );
* ...
* return json;
* }
*
* @return a json object that represents this cell
*/
protected JsonObject toJson() {
JsonObject jsonObject = new JsonObject();
jsonObject.add( PROPERTY_TYPE, type );
if( left != null ) {
jsonObject.add( PROPERTY_LEFT, left.toJson() );
}
if( right != null ) {
jsonObject.add( PROPERTY_RIGHT, right.toJson() );
}
if( top != null ) {
jsonObject.add( PROPERTY_TOP, top.toJson() );
}
if( bottom != null ) {
jsonObject.add( PROPERTY_BOTTOM, bottom.toJson() );
}
if( width != null ) {
jsonObject.add( PROPERTY_WIDTH, width.intValue() );
}
if( height != null ) {
jsonObject.add( PROPERTY_HEIGHT, height.intValue() );
}
if( bindingIndex != -1 ) {
jsonObject.add( PROPERTY_BINDING_INDEX, bindingIndex );
}
if( isSelectable ) {
jsonObject.add( PROPERTY_SELECTABLE, isSelectable );
}
if( name != null ) {
jsonObject.add( PROPERTY_NAME, name );
}
if( foreground != null ) {
jsonObject.add( PROPERTY_FOREGROUND, JsonMapping.toJson( foreground ) );
}
if( background != null ) {
jsonObject.add( PROPERTY_BACKGROUND, JsonMapping.toJson( background ) );
}
if( font != null ) {
jsonObject.add( PROPERTY_FONT, JsonMapping.toJson( font ) );
}
if( horizontalAlignment != SWT.NONE ) {
jsonObject.add( PROPERTY_H_ALIGNMENT, hAlignmentToString( horizontalAlignment ) );
}
if( verticalAlignment != SWT.NONE ) {
jsonObject.add( PROPERTY_V_ALIGNMENT, vAlignmentToString( verticalAlignment ) );
}
return jsonObject;
}
@SuppressWarnings( "unchecked" )
private T getThis() {
return ( T )this;
}
private void checkHorizontalParameters( Object value1, Object value2 ) {
if( value1 != null && value2 != null ) {
throw new IllegalStateException( "Can only set two horizontal attributes" );
}
}
private void checkVerticalParameters( Object value1, Object value2 ) {
if( value1 != null && value2 != null ) {
throw new IllegalStateException( "Can only set two vertical attributes" );
}
}
private static void checkPercentage( float percentage ) {
if( percentage < 0 || percentage > 100 ) {
throw new IllegalArgumentException( "Percentage out of range: " + percentage );
}
}
private static String hAlignmentToString( int alignment ) {
int style = translate( translate( alignment, SWT.BEGINNING, SWT.LEFT ), SWT.END, SWT.RIGHT );
String[] styles = StylesUtil.filterStyles( style, "LEFT", "RIGHT", "CENTER" );
if( styles.length != 0 ) {
return styles[ 0 ];
}
return null;
}
private static String vAlignmentToString( int alignment ) {
int style = translate( translate( alignment, SWT.BEGINNING, SWT.TOP ), SWT.END, SWT.BOTTOM );
String[] styles = StylesUtil.filterStyles( style, "TOP", "BOTTOM", "CENTER" );
if( styles.length != 0 ) {
return styles[ 0 ];
}
return null;
}
private static int translate( int style, int from, int to ) {
return ( style & from ) == from ? to : style;
}
}
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