/******************************************************************************
* Copyright (c) 2016 SAP and Oracle
* 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:
* SAP - initial implementation
* Shenxue Zhou - adaptation for Sapphire and ongoing maintenance
******************************************************************************/
package org.eclipse.sapphire.ui.swt.gef.contextbuttons;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.draw2d.Graphics;
import org.eclipse.draw2d.Shape;
import org.eclipse.draw2d.XYLayout;
import org.eclipse.draw2d.geometry.Rectangle;
import org.eclipse.gef.GraphicalEditPart;
import org.eclipse.sapphire.ui.swt.gef.SapphireDiagramEditor;
import org.eclipse.sapphire.ui.swt.gef.contextbuttons.IContextButtonPadDeclaration.PadStyle;
import org.eclipse.sapphire.ui.swt.gef.figures.FigureUtil;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Path;
import org.eclipse.swt.widgets.Display;
/**
* A Shape depicting a context button pad. The context button pad contains
* several {@link ContextButton} as children. The visual definition of the
* context button pad is provided mostly by the
* {@link IContextButtonPadDeclaration}, which is set in the constructor, and
* not calculated in this class.
*
* @author SAP
* @author <a href="mailto:shenxue.zhou@oracle.com">Shenxue Zhou</a>
*/
public class ContextButtonPad extends Shape {
/**
* The default duration of the animation in milliseconds.
*/
private static final int DEFAULT_ANIMATION_DURATION = 200;
/**
* The start transparency of the animation in the range 0.0 to 1.0.
*/
private static final double ANIMATION_START_TRANSPARENCY = 0.0;
/**
* The end transparency of the animation in the range 0.0 to 1.0.
*/
private static final double ANIMATION_END_TRANSPARENCY = 1.0;
/**
* The context button pad declaration as described in
* {@link #getDeclaration()}.
*/
private IContextButtonPadDeclaration declaration;
/**
* The zoom-level as described in {@link #getZoomLevel()}.
*/
private double zoomLevel;
/**
* The editor as described in {@link #getEditor()}.
*/
private SapphireDiagramEditor editor;
private List<GraphicalEditPart> editParts;
private Path pathOuterLine;
private Path pathMiddleLine;
private Path pathInnerLine;
private Path pathFill;
private List<Rectangle> containmentRectangles;
private List<Rectangle> overlappingContainmentRectangles;
private double currentTransparency = ANIMATION_END_TRANSPARENCY;
private long animationDuration = DEFAULT_ANIMATION_DURATION;
// ============================ constructors ==============================
/**
* Creates a new ContextButtonPad and calls {@link #initialize()}.
*
* @param declaration
* The context button pad declaration as described in
* {@link #getDeclaration()}.
* @param zoomLevel
* The zoom-level as described in {@link #getZoomLevel()}.
* @param editor
* The editor as described in {@link #getEditor()}.
* @param sapphireParts
* The sapphire parts
*/
public ContextButtonPad(IContextButtonPadDeclaration declaration, double zoomLevel, SapphireDiagramEditor editor,
List<GraphicalEditPart> editParts)
{
this.declaration = declaration;
this.zoomLevel = zoomLevel;
this.editor = editor;
this.editParts = new ArrayList<GraphicalEditPart>();
this.editParts.addAll(editParts);
initialize();
}
// ====================== getter/setter for fields ========================
/**
* Returns the declaration, which provides the visual definition and the
* context buttons for this context button pad. It is set in the constructor
* and not changed afterwards.
*
* @return The declaration, which provides the visual definition and the
* context buttons for this context button pad.
*/
public final IContextButtonPadDeclaration getDeclaration() {
return declaration;
}
/**
* Returns the zoom-level, which shall be used when rendering the context
* button pad. It is set in the constructor and not changed afterwards. The
* values provided by the declaration (see {@link #getDeclaration()}) are
* always using a zoom-level 1.0, so they have to be adjusted by the
* zoom-level.
*
* @return The zoom-level, which shall be used when rendering the context
* button pad.
*/
public final double getZoomLevel() {
return zoomLevel;
}
/**
* Returns the editor for which the context button pad belongs. It can be
* used to access the environment. It is set in the constructor and not
* changed afterwards.
*
* @return The editor, which can be used to access the environment.
*/
public final SapphireDiagramEditor getEditor() {
return editor;
}
// =========================== initialization =============================
/**
* Initializes several fields of this class. This method is called in the
* constructor and calls {@link #initializePathes()},
* {@link #initializeContainments()} and {@link #createContextButtons()}.
*/
private void initialize() {
initializeContainments();
createContextButtons();
}
/**
* Initializes the lists {@link #containmentRectangles} and
* {@link #overlappingContainmentRectangles}, by transforming the rectangles
* provided by the declaration (see {@link #getDeclaration()}) using
* {@link #transformGenericRectangle(java.awt.Rectangle, int)}. Then it sets
* the bounds of this figure dependent on the
* {@link #overlappingContainmentRectangles}.
*/
private void initializeContainments() {
containmentRectangles = new ArrayList<Rectangle>();
overlappingContainmentRectangles = new ArrayList<Rectangle>();
for (java.awt.Rectangle rectangle : getDeclaration().getContainmentRectangles()) {
Rectangle transformedRectangle = transformGenericRectangle(rectangle, 0);
containmentRectangles.add(transformedRectangle);
}
for (java.awt.Rectangle rectangle : getDeclaration().getOverlappingContainmentRectangles()) {
Rectangle transformedRectangle = transformGenericRectangle(rectangle, 0);
overlappingContainmentRectangles.add(transformedRectangle);
}
if (overlappingContainmentRectangles.size() > 0) { // always true
Rectangle unionRectangle = overlappingContainmentRectangles.get(0).getCopy();
for (Rectangle containmentRectangle : overlappingContainmentRectangles) {
unionRectangle.union(containmentRectangle);
}
unionRectangle.expand(2, 2); // expand slightly to avoid rounding problems
setBounds(unionRectangle);
}
}
/**
* Creates a visual {@link ContextButton} for each logical
* {@link PositionedContextButton}, which are provided by the declaration
* {@link #getDeclaration()}. Those context buttons are then added to the
* context button pad at the correct location.
*/
private void createContextButtons() {
List<PositionedContextButton> positionedButtons = getDeclaration().getPositionedContextButtons();
setLayoutManager(new XYLayout());
for (PositionedContextButton positionedButton : positionedButtons) {
Rectangle position = transformGenericRectangle(positionedButton.getPosition(), 0);
// translate position relative to bounds (after the bounds are set!)
position.translate(-getBounds().getTopLeft().x, -getBounds().getTopLeft().y);
ContextButton cb = new ContextButton(positionedButton, this);
add(cb, position);
}
}
/**
* Initializes the fields for the paths {@link #pathOuterLine},
* {@link #pathMiddleLine}, {@link #pathInnerLine} and {@link #pathFill}.
* This is done by calling {@link #createPath(int)} with ascending values
* for 'shrink-lines'. As a result those four paths all have the same
* outline, but each path becomes one line smaller so that they lie directly
* in each other.
*/
private void createPathes() {
pathOuterLine = createPath(0);
pathMiddleLine = createPath(1);
pathInnerLine = createPath(2);
pathFill = createPath(3);
}
/**
* Disposes all paths, which were created in {@link #createPathes()}.
*/
private void disposePathes() {
pathOuterLine.dispose();
pathMiddleLine.dispose();
pathInnerLine.dispose();
pathFill.dispose();
pathOuterLine = null;
pathMiddleLine = null;
pathInnerLine = null;
pathFill = null;
}
/**
* Creates and returns a path outlining the context button pad. The path
* includes the three rectangles top, right and bottom, which are provided
* by the declaration (see {@link #getDeclaration()}). A parameter
* shrink-lines is used to shrink the path by the given number of lines to
* the inside.
* <p>
* Basically this method just forwards to
* {@link #createPath(Rectangle, Rectangle, Rectangle, int)}, but before it
* adjusts the rectangles and corner by the zoom-level and shrink-lines.
*
* @param shrinkLines
* The number of lines to shrink the path to the inside.
* @return A path outlining the context button pad.
*/
private Path createPath(int shrinkLines) {
double zoom = getZoomLevel();
int lw = shrinkLines * ((int) (getDeclaration().getPadLineWidth() * zoom));
// adjust corner for the inner path (formula found by experimenting)
double corner = (getDeclaration().getPadCornerRadius() * zoom);
corner = Math.max(1, corner - (lw + corner / 64));
Rectangle topAdjusted = transformGenericRectangle(getDeclaration().getTopPad(), shrinkLines);
Rectangle rightAdjusted = transformGenericRectangle(getDeclaration().getRightPad(), shrinkLines);
Rectangle bottomAdjusted = transformGenericRectangle(getDeclaration().getBottomPad(), shrinkLines);
Path path = createPath(topAdjusted, rightAdjusted, bottomAdjusted, (int) corner);
return path;
}
/**
* Creates and returns a path including the given rectangles and uses the
* given corner-radius. Note, that all those values are already adjusted to
* the given zoom-level and 'shrink-lines' (see {@link #createPath(int)}).
*
* @param topOutside
* The outside of the top rectangle to include. The path remains
* inside the rectangle even for a big line-width.
* @param rightOutside
* The outside of the right rectangle to include. The path
* remains inside the rectangle even for a big line-width.
* @param bottomOutside
* The outside of the bottom rectangle to include. The path
* remains inside the rectangle even for a big line-width.
* @param corner
* The corner radius to use for the path.
* @return A path surrounding the given rectangles and uses the given
* corner-radius.
*/
private Path createPath(Rectangle topOutside, Rectangle rightOutside, Rectangle bottomOutside, int corner) {
Path path = new Path(null);
// currently we assume, that the inner corner radius is always half the outer corner radius
int innerCorner = corner / 2;
// first shrink all rectangles by the half line-width, so that painting remains inside the given 'outside' rectangles
Rectangle top = FigureUtil.getAdjustedRectangle(topOutside, 1.0, (int) (getDeclaration().getPadLineWidth() * getZoomLevel()));
Rectangle right = FigureUtil.getAdjustedRectangle(rightOutside, 1.0, (int) (getDeclaration().getPadLineWidth() * getZoomLevel()));
Rectangle bottom = FigureUtil.getAdjustedRectangle(bottomOutside, 1.0,
(int) (getDeclaration().getPadLineWidth() * getZoomLevel()));
// differenciate the pad styles
boolean hasTop = top != null;
boolean hasRight = right != null;
boolean hasStandardTop = hasTop && getDeclaration().getTopPadStyle().equals(PadStyle.STANDARD);
boolean hasStandardRight = hasRight && getDeclaration().getRightPadStyle().equals(PadStyle.STANDARD);
boolean hasAppendageTop = hasTop && getDeclaration().getTopPadStyle().equals(PadStyle.APPENDAGE);
boolean hasAppendageRight = hasRight && getDeclaration().getRightPadStyle().equals(PadStyle.APPENDAGE);
// create path
if (hasStandardTop) {
// curved line around top(top-right) -> top(top-left) -> top(bottom-left)
path.addArc(top.getTopRight().x - corner, top.getTopRight().y, corner, corner, 0, 90);
path.addArc(top.getTopLeft().x, top.getTopLeft().y, corner, corner, 90, 90);
path.addArc(top.getBottomLeft().x, top.getBottomLeft().y - corner, corner, corner, 180, 90);
} else if (hasAppendageTop) {
// curved line around top(top-left) -> top(bottom-left)
int appendageCorner = Math.min(corner, top.height * 2); // adjust for small sizes
path.addArc(top.getTopLeft().x, top.getTopLeft().y, appendageCorner, appendageCorner, 90, 90);
path.lineTo(top.getBottomLeft().x, top.getBottomLeft().y);
} else { // !hasTop
// curved line around right(top-left)
path.addArc(right.getTopLeft().x, right.getTopLeft().y, corner, corner, 90, 90);
}
if (hasTop && hasRight) {
// inside open curve connecting top and right
path.addArc(right.getLeft().x - innerCorner, top.getBottom().y, innerCorner, innerCorner, 90, -90);
}
if (hasStandardRight) {
if (bottom == null) {
// curved line around right(bottom-left)
path.addArc(right.getBottomLeft().x, right.getBottomLeft().y - corner, corner, corner, 180, 90);
} else {
// inside open curve connection right and bottom
path.addArc(right.getLeft().x - innerCorner, bottom.getTop().y - innerCorner, innerCorner, innerCorner, 0, -90);
// curved line around bottom(top-left) -> bottom(bottom-left) -> bottom(bottom-right)
path.addArc(bottom.getTopLeft().x, bottom.getTopLeft().y, corner, corner, 90, 90);
path.addArc(bottom.getBottomLeft().x, bottom.getBottomLeft().y - corner, corner, corner, 180, 90);
path.addArc(bottom.getBottomRight().x - corner, bottom.getBottomRight().y - corner, corner, corner, 270, 90);
// outside open curve connection bottom and right
path.addArc(bottom.getRight().x, right.getBottom().y, corner, corner, 180, -90);
}
// curved line around right(bottom-right) -> right(top-right)
path.addArc(right.getBottomRight().x - corner, right.getBottomRight().y - corner, corner, corner, 270, 90);
path.addArc(right.getTopRight().x - corner, right.getTopRight().y, corner, corner, 0, 90);
} else if (hasAppendageRight) {
// curved line around right(bottom-left) -> right(bottom-right)
int appendageCorner = Math.min(corner, right.width * 2); // adjust for small sizes
path.lineTo(right.getBottomLeft().x, right.getBottomLeft().y);
path.addArc(right.getBottomRight().x - appendageCorner, right.getBottomRight().y - appendageCorner, appendageCorner,
appendageCorner, 270, 90);
} else { // !hasRight
// close curved rectangle around top (bottom-right)
path.addArc(top.getBottomRight().x - corner, top.getBottomRight().y - corner, corner, corner, 270, 90);
}
if (hasStandardTop && hasStandardRight) {
// outside open curve connecting right and top (appendages have direct line)
path.addArc(top.getRight().x, right.getTop().y - corner, corner, corner, 270, -90);
}
path.close();
return path;
}
/**
* Returns a rectangle, which is calculating from the given rectangle by
* shrinking it the given number of lines and scaling it with the
* zoom-level. Note, that this method also makes a transformation from
* java.awt.Rectangle to org.eclipse.draw2d.geometry.Rectangle.
*
* @param source
* The source rectangle from which to calculate the result.
* @param shrinkLines
* The number of lines to shrink the rectangle.
* @return A rectangle, which is calculating from the given rectangle by
* shrinking it the given number of lines and scaling it with the
* zoom-level.
*/
private Rectangle transformGenericRectangle(java.awt.Rectangle source, int shrinkLines) {
if (source == null) {
return null;
}
double zoom = getZoomLevel();
int lw = shrinkLines * ((int) (getDeclaration().getPadLineWidth() * zoom));
Rectangle target = new Rectangle(source.x, source.y, source.width, source.height);
target.scale(zoom);
// shrink, but take care not to end up with a negative width or height
int widthShrink = Math.min(target.width / 2, lw);
int heightShrink = Math.min(target.height / 2, lw);
target.shrink(widthShrink, heightShrink);
return target;
}
// ============================== painting ================================
/**
* Outlines this Shape on the given Graphics. This will draw the paths
* {@link #pathInnerLine}, {@link #pathMiddleLine} and
* {@link #pathOuterLine}.
*
* @param graphics
* The Graphics on which to outline this Shape.
*/
@Override
protected void outlineShape(Graphics graphics) {
int lw = (int) (getZoomLevel() * getDeclaration().getPadLineWidth());
graphics.setLineWidth(lw);
graphics.setForegroundColor(getEditor().getResourceCache().getColor(getDeclaration().getPadInnerLineColor()));
graphics.drawPath(pathInnerLine);
graphics.setForegroundColor(getEditor().getResourceCache().getColor(getDeclaration().getPadMiddleLineColor()));
graphics.drawPath(pathMiddleLine);
graphics.setForegroundColor(getEditor().getResourceCache().getColor(getDeclaration().getPadOuterLineColor()));
graphics.drawPath(pathOuterLine);
}
/**
* First initializes the given Graphics with settings like alpha-value,
* antialias-value, ... Afterwards calls
* <code>super.paintFigure(graphics)</code> to continue with the default
* painting mechanisms.
*
* @param graphics
* The Graphics on which to paint.
*/
@Override
public void paintFigure(Graphics graphics) {
graphics.setAntialias(SWT.ON);
// double padDefaultOpacity = getDeclaration().getPadDefaultOpacity();
// int endAlpha = (int) (padDefaultOpacity * 255.0);
graphics.setAlpha((int) (currentTransparency * getDeclaration().getPadDefaultOpacity() * 255));
createPathes();
super.paintFigure(graphics);
disposePathes();
}
/**
* Fills this Shape on the given Graphics. This will draw and fill the path
* {@link #pathFill}.
*
* @param graphics
* The Graphics on which to fill this Shape.
*/
@Override
protected void fillShape(Graphics graphics) {
int lw = (int) (getZoomLevel() * getDeclaration().getPadLineWidth());
graphics.setLineWidth(lw);
graphics.setForegroundColor(getEditor().getResourceCache().getColor(getDeclaration().getPadFillColor()));
graphics.setBackgroundColor(getEditor().getResourceCache().getColor(getDeclaration().getPadFillColor()));
graphics.drawPath(pathFill);
graphics.fillPath(pathFill);
}
/**
* Increases the current transparency (see {@link #getCurrentTransparency()}
* ) in a loop and forces a repaint after each increase. As a result this
* will seem to the user as if the context button pad slowly 'fades in' from
* invisible to visible.
*/
@SuppressWarnings("unused")
private void doAnimation() {
// set start values for animation
long startTime = System.currentTimeMillis();
long stepsDone = 0;
currentTransparency = ANIMATION_START_TRANSPARENCY;
while (isPadShowing() && (currentTransparency < ANIMATION_END_TRANSPARENCY)) {
// repaint context button pad with current transparency
forceRepaint();
stepsDone++;
// increase current transparency (self adjusting algorithm)
long elapsedTime = Math.max(1, System.currentTimeMillis() - startTime);
long restTime = Math.max(1, animationDuration - elapsedTime);
double restSteps = (((double) (stepsDone * restTime)) / elapsedTime);
double deltaTransparency = (ANIMATION_END_TRANSPARENCY - currentTransparency) / restSteps;
currentTransparency += deltaTransparency;
if (elapsedTime > animationDuration) { // safeguard in case of rounding errors
currentTransparency = ANIMATION_END_TRANSPARENCY;
}
}
// finally paint using the end transparency
currentTransparency = ANIMATION_END_TRANSPARENCY;
forceRepaint();
}
/**
* Forces a repaint of this figure, by first calling repaint() and then
* waiting until all UI events are processed.
*/
private void forceRepaint() {
if (isPadShowing()) {
repaint();
while (Display.getCurrent().readAndDispatch()) {
// do nothing
}
}
}
// ========================== helper methods ==============================
/**
* Returns true, if the given point is contained inside one of the visible
* parts of the context button pad. Note, that this is a much smaller area
* than the bounds of this shape, because the bounds are the outer invisible
* rectangle around all visible parts of the context button pad.
* <p>
* Technically this is the union of all containment rectangles (see
* {@link IContextButtonPadDeclaration#getContainmentRectangles()}).
*
* @param x
* The x-coordinate of the point to check.
* @param y
* The y-coordinate of the point to check.
* @return true, if the given point is contained inside one of the visible
* parts of the context button pad.
*/
@Override
public boolean containsPoint(int x, int y) {
boolean ret = false;
for (Rectangle rectangle : containmentRectangles) {
if (rectangle.contains(x, y)) {
ret = true;
break;
}
}
return ret;
}
public final List<GraphicalEditPart> getEditParts() {
return this.editParts;
}
/**
* Returns true, if the given point is contained inside the overlapping area
* of all visible parts of the context button pad. Note, that this is a much
* smaller area than the bounds of this shape, because the bounds are the
* outer invisible rectangle around all visible parts of the context button
* pad.
*
* @param x
* The x-coordinate of the point to check.
* @param y
* The y-coordinate of the point to check.
* @return true, if the given point is contained inside the overlapping area
* of all visible parts of the context button pad.
*/
public boolean containsPointOverlapping(int x, int y) {
boolean ret = false;
for (Rectangle rectangle : overlappingContainmentRectangles) {
if (rectangle.contains(x, y)) {
ret = true;
break;
}
}
return ret;
}
/**
* Returns the current transparency as described in
* {@link ITransparencyProvider}.
*
* @return The current transparency as described in
* {@link ITransparencyProvider}.
*/
public double getCurrentTransparency() {
return currentTransparency;
}
/**
* Returns true, if the pad is currently showing.
*
* @return true, if the pad is currently showing.
*/
private boolean isPadShowing() {
// returns true in the time, between addNotify() and removeNotify()
boolean hasParent = getParent() != null;
return hasParent;
}
}