/*******************************************************************************
* Copyright (c) 2010, 2016 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.demo.controls;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.events.PaintListener;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Path;
import org.eclipse.swt.graphics.Transform;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.layout.RowLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Group;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Listener;
public final class CanvasTab extends ExampleTab {
private Canvas canvas;
public CanvasTab() {
super( "Canvas" );
}
@Override
protected void createStyleControls( Composite parent ) {
createStyleButton( "BORDER", SWT.BORDER );
cteateRoundedBorderGroup();
createVisibilityButton();
createEnablementButton();
createBgColorButton();
createBgGradientButton();
createBgImageButton();
createRedrawButtons( parent );
}
private void createRedrawButtons( Composite parent ) {
Group group = new Group( parent, SWT.NONE );
group.setText( "Redraw" );
group.setLayout( new GridLayout( 2, false ) );
Button redrawAllButton = new Button( group, SWT.PUSH );
redrawAllButton.setText( "All" );
redrawAllButton.addListener( SWT.Selection, new Listener() {
@Override
public void handleEvent( Event event ) {
canvas.redraw();
}
} );
Button redrawRectButton = new Button( group, SWT.PUSH );
redrawRectButton.setText( "Rectangle ( 50, 200, 200, 200 )" );
redrawRectButton.addListener( SWT.Selection, new Listener() {
@Override
public void handleEvent( Event event ) {
canvas.redraw( 50, 200, 200, 200, false );
}
} );
}
@Override
protected void createExampleControls( Composite parent ) {
parent.setLayout( new FillLayout() );
canvas = new Canvas( parent, getStyle() );
canvas.setLayout( new RowLayout( SWT.HORIZONTAL ) );
canvas.addPaintListener( new PaintListener() {
@Override
public void paintControl( PaintEvent event ) {
if( event.width > 250 ) {
event.gc.drawPoint( 230, 100 );
paintLines( event.display, event.gc );
paintRectangles( event.display, event.gc );
paintArcs( event.display, event.gc );
paintImages( event.display, event.gc );
paintTexts( event.display, event.gc );
paintPolylines( event.display, event.gc );
paintWithClipping( event.display, event.gc );
paintPath( event.display, event.gc );
paintTransform( event.display, event.gc );
} else {
event.gc.drawRectangle( event.x, event.y, event.width - 1, event.height - 1 );
}
}
} );
canvas.redraw();
registerControl( canvas );
Label label = new Label( canvas, SWT.NONE );
label.setText( "Label" );
Button pushButton = new Button( canvas, SWT.PUSH );
pushButton.setText( "Push Button" );
}
private void paintLines( Display display, GC gc ) {
gc.drawLine( 30, 130, 400, 130 );
gc.setLineWidth( 10 );
gc.setForeground( display.getSystemColor( SWT.COLOR_GREEN ) );
gc.setAlpha( 64 );
gc.drawLine( 30, 140, 400, 140 );
gc.setForeground( display.getSystemColor( SWT.COLOR_RED ) );
gc.setLineJoin( SWT.JOIN_ROUND );
gc.setLineCap( SWT.CAP_ROUND );
int[] pointArray = new int[] {
70, 120,
100, 150,
130, 120,
160, 150
};
gc.drawPolyline( pointArray );
gc.setForeground( display.getSystemColor( SWT.COLOR_DARK_MAGENTA ) );
gc.setLineJoin( SWT.JOIN_BEVEL );
gc.setLineCap( SWT.CAP_SQUARE );
pointArray = new int[] {
170, 120,
200, 150,
230, 120,
260, 150
};
gc.drawPolyline( pointArray );
gc.setForeground( display.getSystemColor( SWT.COLOR_DARK_RED ) );
gc.setLineJoin( SWT.JOIN_MITER );
gc.setLineCap( SWT.CAP_FLAT );
pointArray = new int[] {
270, 120,
300, 150,
330, 120,
360, 150
};
gc.drawPolyline( pointArray );
gc.setLineWidth( 1 );
gc.setAlpha( 255 );
}
private void paintRectangles( Display display, GC gc ) {
gc.setForeground( display.getSystemColor( SWT.COLOR_BLACK ) );
gc.drawRectangle( 30, 160, 50, 50 );
gc.setForeground( display.getSystemColor( SWT.COLOR_BLUE ) );
gc.drawRoundRectangle( 90, 160, 50, 50, 10, 10 );
gc.setBackground( display.getSystemColor( SWT.COLOR_GREEN ) );
gc.fillRectangle( 150, 160, 50, 50 );
gc.fillRoundRectangle( 210, 160, 50, 50, 10, 10 );
gc.fillGradientRectangle( 270, 160, 50, 50, true );
gc.fillGradientRectangle( 330, 160, 50, 50, false );
}
private void paintArcs( Display display, GC gc ) {
gc.setForeground( display.getSystemColor( SWT.COLOR_BLUE ) );
gc.drawOval( 30, 220, 50, 25 );
gc.setBackground( display.getSystemColor( SWT.COLOR_WHITE ) );
gc.setForeground( display.getSystemColor( SWT.COLOR_GREEN ) );
gc.drawArc( 90, 220, 50, 25, 45, 180 );
gc.setBackground( display.getSystemColor( SWT.COLOR_MAGENTA ) );
gc.fillArc( 150, 220, 50, 25, 45, 250 );
gc.setBackground( display.getSystemColor( SWT.COLOR_BLUE ) );
gc.fillOval( 210, 220, 50, 50 );
}
private void paintImages( Display display, GC gc ) {
Image image = display.getSystemImage( SWT.ICON_INFORMATION );
int width = image.getImageData().width;
int height = image.getImageData().height;
gc.drawImage( image, 30, 280 );
gc.setAlpha( 64 );
gc.drawImage( image, 90, 280 );
gc.setAlpha( 255 );
gc.drawImage( image,
9,
3,
width - 20,
height - 6,
150,
280,
width - 10,
height + 4 );
}
private void paintTexts( Display display, GC gc ) {
gc.setForeground( display.getSystemColor( SWT.COLOR_WHITE ) );
gc.drawString( "Hello RAP World!", 200, 280, false );
Font font = new Font( display, "Arial, Verdana, Tahoma", 16, SWT.BOLD | SWT.ITALIC );
gc.setFont( font );
gc.setForeground( display.getSystemColor( SWT.COLOR_RED ) );
gc.drawText( "\tHello RAP World!\nAgain!", 200, 350, true );
}
private void paintPolylines( Display display, GC gc ) {
int[] pointArray = new int[] {
55, 340,
80, 365,
55, 390,
30, 365
};
gc.drawPolygon( pointArray );
pointArray = new int[] {
105, 340,
130, 365,
105, 390,
80, 365
};
gc.fillPolygon( pointArray );
pointArray = new int[] {
155, 340,
180, 365,
155, 390,
130, 365
};
gc.drawPolyline( pointArray );
}
private void paintPath( Display display, GC gc ) {
gc.setForeground( display.getSystemColor( SWT.COLOR_BLUE ) );
gc.setLineWidth( 5 );
Path path = new Path( display );
path.moveTo( 100, 420 );
path.lineTo( 200, 560 );
path.quadTo( 230, 600, 250, 520 );
path.cubicTo( 290, 360, 300, 600, 400, 550 );
path.lineTo( 500, 490 );
gc.drawPath( path );
path.dispose();
}
private void paintWithClipping( Display display, GC gc ) {
Path path = new Path( display );
path.moveTo( 30, 430 );
path.lineTo( 150, 550 );
path.cubicTo( 60, 470, 60, 470, 70, 550 );
path.close();
gc.setClipping( path );
path.dispose();
gc.setBackground( display.getSystemColor( SWT.COLOR_BLACK ) );
gc.fillRectangle( 20, 420, 500, 50 );
gc.setBackground( display.getSystemColor( SWT.COLOR_RED ) );
gc.fillRectangle( 20, 470, 500, 50 );
gc.setBackground( display.getSystemColor( SWT.COLOR_YELLOW ) );
gc.fillRectangle( 20, 520, 500, 50 );
gc.setClipping( ( Path )null );
}
private void paintTransform( Display display, GC gc ) {
Transform transform = new Transform( display );
transform.translate( 350, 430 );
gc.setTransform( transform );
gc.setBackground( display.getSystemColor( SWT.COLOR_BLACK ) );
gc.fillRectangle( 0, 0, 100, 50 );
transform.rotate( 10 );
gc.setTransform( transform );
gc.setBackground( display.getSystemColor( SWT.COLOR_RED ) );
gc.fillRectangle( 0, 0, 100, 50 );
transform.rotate( 10 );
gc.setTransform( transform );
gc.setBackground( display.getSystemColor( SWT.COLOR_YELLOW ) );
gc.fillRectangle( 0, 0, 100, 50 );
transform.identity();
gc.setTransform( transform );
transform.dispose();
}
}