/*
* Copyright 2015 JBoss, by Red Hat, Inc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.uberfire.ext.wires.core.client.palette;
import javax.enterprise.context.ApplicationScoped;
import javax.enterprise.event.Event;
import javax.inject.Inject;
import com.ait.lienzo.client.core.event.NodeMouseDownEvent;
import com.ait.lienzo.client.core.event.NodeMouseDownHandler;
import com.ait.lienzo.client.core.shape.Group;
import com.ait.lienzo.client.core.shape.Layer;
import com.ait.lienzo.client.core.shape.Rectangle;
import com.ait.lienzo.client.core.shape.Text;
import com.ait.lienzo.client.widget.LienzoPanel;
import com.ait.lienzo.shared.core.types.TextBaseLine;
import com.google.gwt.dom.client.Style;
import com.google.gwt.event.dom.client.MouseMoveEvent;
import com.google.gwt.event.dom.client.MouseMoveHandler;
import com.google.gwt.event.dom.client.MouseUpEvent;
import com.google.gwt.event.dom.client.MouseUpHandler;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.user.client.ui.RootPanel;
import org.uberfire.ext.wires.core.api.events.ShapeDragCompleteEvent;
import org.uberfire.ext.wires.core.api.events.ShapeDragPreviewEvent;
import org.uberfire.ext.wires.core.api.factories.FactoryHelper;
import org.uberfire.ext.wires.core.api.factories.ShapeDragProxy;
import org.uberfire.ext.wires.core.api.factories.ShapeDragProxyCompleteCallback;
import org.uberfire.ext.wires.core.api.factories.ShapeDragProxyPreviewCallback;
import org.uberfire.ext.wires.core.api.factories.ShapeFactory;
import org.uberfire.ext.wires.core.api.factories.ShapeGlyph;
import org.uberfire.ext.wires.core.api.shapes.WiresBaseShape;
import org.uberfire.ext.wires.core.client.util.ShapeFactoryUtil;
@ApplicationScoped
public class StencilPaletteBuilder {
private static final int ZINDEX = Integer.MAX_VALUE;
private static final double GLYPH_WIDTH = 65;
private static final double GLYPH_HEIGHT = 65;
@Inject
private Event<ShapeDragCompleteEvent> shapeDragCompleteEvent;
@Inject
private Event<ShapeDragPreviewEvent> shapeDragPreviewEvent;
public PaletteShape build(final LienzoPanel dragProxyParentPanel,
final FactoryHelper helper,
final ShapeFactory factory) {
final PaletteShape paletteShape = new PaletteShape();
final ShapeGlyph glyph = drawGlyph(factory,
helper);
final Text description = drawDescription(factory,
helper);
final Rectangle bounding = drawBoundingBox(factory,
helper);
//Callback is invoked when the drag operation ends
final ShapeDragProxyCompleteCallback dragCompleteCallback = new ShapeDragProxyCompleteCallback() {
@Override
public void callback(final double x,
final double y) {
shapeDragCompleteEvent.fire(new ShapeDragCompleteEvent(factory.getShape(helper),
x,
y));
}
};
//Callback is invoked during the drag operation
final WiresBaseShape shape = factory.getShape(helper);
final ShapeDragProxyPreviewCallback dragPreviewCallback = new ShapeDragProxyPreviewCallback() {
@Override
public void callback(final double x,
final double y) {
shapeDragPreviewEvent.fire(new ShapeDragPreviewEvent(shape,
x,
y));
}
};
//Attach handles for drag operation
final ShapeDragProxy dragProxy = factory.getDragProxy(helper,
dragPreviewCallback,
dragCompleteCallback);
addDragHandlers(dragProxyParentPanel,
dragProxy,
paletteShape);
//Build Palette Shape
paletteShape.setBounding(bounding);
paletteShape.setGroup(scaleGlyph(glyph));
paletteShape.setDescription(description);
return paletteShape;
}
/**
* Return a ShapeGlyph that represents the Factory in the Palette.
* This implementation delegates this to the ShapeFactory.
* @param factory ShapeFactory that is capable of providing a default ShapeGlyph
* @param helper FactoryHelper that might provide additional information to build a Glyph. Unused by this implementation.
* @return A ShapeGlyph object or null if one is not required.
*/
protected ShapeGlyph drawGlyph(final ShapeFactory factory,
final @SuppressWarnings("unused") FactoryHelper helper) {
return factory.getGlyph();
}
/**
* Scale the Shape provided by the ShapeFactory as the glyph to fit the PaletteShape.
* @param glyph
* @return
*/
protected Group scaleGlyph(final ShapeGlyph glyph) {
final double sx = GLYPH_WIDTH / glyph.getWidth();
final double sy = GLYPH_HEIGHT / glyph.getHeight();
final Group group = glyph.getGroup();
return group.setX(ShapeFactoryUtil.WIDTH_BOUNDING / 2).setY(ShapeFactoryUtil.WIDTH_BOUNDING / 2).setScale(sx,
sy);
}
/**
* Return Text that represents the Factory in the Palette.
* This implementation delegates this to the ShapeFactory.
* @param factory ShapeFactory that is capable of providing a default description
* @param helper FactoryHelper that might provide additional information to build a Glyph. Unused by this implementation.
* @return A Text object or null if one is not required.
*/
protected Text drawDescription(final ShapeFactory factory,
final @SuppressWarnings("unused") FactoryHelper helper) {
Text text = new Text(factory.getShapeDescription(),
ShapeFactoryUtil.FONT_FAMILY_DESCRIPTION,
ShapeFactoryUtil.FONT_SIZE_DESCRIPTION);
text.setFillColor(ShapeFactoryUtil.RGB_TEXT_DESCRIPTION);
text.setTextBaseLine(TextBaseLine.MIDDLE);
text.setX(5);
text.setY(85);
return text;
}
/**
* Return a Rectangle that is the bounding box for the PaletteShape.
* This implementation does not use the ShapeFactory but sub-classes could.
* @param factory ShapeFactory that might be useful for sub-classes to build a bounding Rectangle
* @param helper FactoryHelper that might provide additional information to build a Glyph. Unused by this implementation.
* @return A Rectangle object or null if one is not required.
*/
protected Rectangle drawBoundingBox(final @SuppressWarnings("unused") ShapeFactory factory,
final @SuppressWarnings("unused") FactoryHelper helper) {
final Rectangle boundingBox = new Rectangle(ShapeFactoryUtil.WIDTH_BOUNDING,
ShapeFactoryUtil.HEIGHT_BOUNDING);
boundingBox.setStrokeColor(ShapeFactoryUtil.RGB_STROKE_BOUNDING)
.setStrokeWidth(1)
.setFillColor(ShapeFactoryUtil.RGB_FILL_BOUNDING)
.setDraggable(false);
return boundingBox;
}
private void addDragHandlers(final LienzoPanel dragProxyParentPanel,
final ShapeDragProxy proxy,
final Group shape) {
shape.addNodeMouseDownHandler(getShapeDragStartHandler(dragProxyParentPanel,
proxy));
}
private NodeMouseDownHandler getShapeDragStartHandler(final LienzoPanel dragProxyParentPanel,
final ShapeDragProxy proxy) {
return new NodeMouseDownHandler() {
@Override
public void onNodeMouseDown(final NodeMouseDownEvent event) {
final double proxyWidth = proxy.getWidth();
final double proxyHeight = proxy.getHeight();
final Group dragShape = proxy.getDragGroup();
dragShape.setX(proxyWidth / 2);
dragShape.setY(proxyHeight / 2);
final LienzoPanel dragProxyPanel = new LienzoPanel((int) proxyWidth,
(int) proxyHeight);
final Layer dragProxyLayer = new Layer();
dragProxyLayer.add(dragShape);
dragProxyPanel.add(dragProxyLayer);
dragProxyLayer.batch();
setDragProxyPosition(dragProxyParentPanel,
dragProxyPanel,
proxyWidth,
proxyHeight,
event);
attachDragProxyHandlers(dragProxyPanel,
proxy);
RootPanel.get().add(dragProxyPanel);
}
};
}
private void setDragProxyPosition(final LienzoPanel dragProxyParentPanel,
final LienzoPanel dragProxyPanel,
final double proxyWidth,
final double proxyHeight,
final NodeMouseDownEvent event) {
Style style = dragProxyPanel.getElement().getStyle();
style.setPosition(Style.Position.ABSOLUTE);
style.setLeft(dragProxyParentPanel.getAbsoluteLeft() + event.getX() - (proxyWidth / 2),
Style.Unit.PX);
style.setTop(dragProxyParentPanel.getAbsoluteTop() + event.getY() - (proxyHeight / 2),
Style.Unit.PX);
style.setZIndex(ZINDEX);
}
private void attachDragProxyHandlers(final LienzoPanel floatingPanel,
final ShapeDragProxy proxy) {
final Style style = floatingPanel.getElement().getStyle();
final HandlerRegistration[] handlerRegs = new HandlerRegistration[2];
//MouseMoveEvents
handlerRegs[0] = RootPanel.get().addDomHandler(new MouseMoveHandler() {
@Override
public void onMouseMove(final MouseMoveEvent mouseMoveEvent) {
style.setLeft(mouseMoveEvent.getX() - (floatingPanel.getWidth() / 2),
Style.Unit.PX);
style.setTop(mouseMoveEvent.getY() - (floatingPanel.getHeight() / 2),
Style.Unit.PX);
proxy.onDragPreview(mouseMoveEvent.getX(),
mouseMoveEvent.getY());
}
},
MouseMoveEvent.getType());
//MouseUpEvent
handlerRegs[1] = RootPanel.get().addDomHandler(new MouseUpHandler() {
@Override
public void onMouseUp(final MouseUpEvent mouseUpEvent) {
handlerRegs[0].removeHandler();
handlerRegs[1].removeHandler();
RootPanel.get().remove(floatingPanel);
proxy.onDragComplete(mouseUpEvent.getX(),
mouseUpEvent.getY());
}
},
MouseUpEvent.getType());
}
}