--- /dev/null
+/*******************************************************************************\r
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
+ * in Industry THTH ry.\r
+ * All rights reserved. This program and the accompanying materials\r
+ * are made available under the terms of the Eclipse Public License v1.0\r
+ * which accompanies this distribution, and is available at\r
+ * http://www.eclipse.org/legal/epl-v10.html\r
+ *\r
+ * Contributors:\r
+ * VTT Technical Research Centre of Finland - initial API and implementation\r
+ *******************************************************************************/\r
+package org.simantics.g2d.diagram.handler.layout;\r
+\r
+import java.awt.geom.Rectangle2D;\r
+import java.util.ArrayList;\r
+import java.util.Collection;\r
+import java.util.List;\r
+import java.util.Map;\r
+import java.util.Map.Entry;\r
+\r
+import org.simantics.g2d.diagram.IDiagram;\r
+import org.simantics.g2d.diagram.handler.LayoutManager;\r
+import org.simantics.g2d.element.ElementUtils;\r
+import org.simantics.g2d.element.IElement;\r
+import org.simantics.utils.datastructures.hints.IHintContext.Key;\r
+import org.simantics.utils.datastructures.hints.IHintContext.KeyOf;\r
+\r
+public class FlowLayout implements LayoutManager {\r
+\r
+ /** Diagram hint, Row justification */\r
+ public static enum Align {Left, Center, Right, Fill}\r
+\r
+ /**\r
+ * The align specifies the alignment of elements\r
+ * in a row.\r
+ */\r
+ public static final Key ALIGN = new KeyOf(Align.class, "FlowLayout.ALIGN");\r
+\r
+ /**\r
+ * The horizontal gap specifies the space between\r
+ * elements and between an element and borders.\r
+ */\r
+ public static final Key HGAP = new KeyOf(Double.class, "FlowLayout.HGAP");\r
+\r
+ /**\r
+ * The vertical gap specifies the space between\r
+ * elements and between an element and borders.\r
+ */\r
+ public static final Key VGAP = new KeyOf(Double.class, "FlowLayout.VGAP");\r
+\r
+ @Override\r
+ public void layout(IDiagram diagram, Rectangle2D bounds) {\r
+ Align align = diagram.getHint(ALIGN);\r
+ Double hgap = diagram.getHint(HGAP);\r
+ Double vgap = diagram.getHint(VGAP);\r
+ if (align==null) align = Align.Left;\r
+ if (hgap==null) hgap = 0.;\r
+ if (vgap==null) vgap = 0.;\r
+\r
+ Map<IElement, Rectangle2D> pos = computePositions(diagram, bounds, align, hgap, vgap);\r
+ for (Entry<IElement, Rectangle2D> e : pos.entrySet()) {\r
+ ElementUtils.setPos(e.getKey(), e.getValue().getMinX(), e.getValue().getMinY());\r
+ }\r
+ }\r
+\r
+ @Override\r
+ public Rectangle2D computeSize(IDiagram diagram, Double wHint, Double hHint)\r
+ {\r
+ Rectangle2D bounds = new Rectangle2D.Double();\r
+ Align align = diagram.getHint(ALIGN);\r
+ Double hgap = diagram.getHint(HGAP);\r
+ Double vgap = diagram.getHint(VGAP);\r
+ if (align==null) align = Align.Left;\r
+ if (hgap==null) hgap = 0.;\r
+ if (vgap==null) vgap = 0.;\r
+\r
+ if (wHint==null) wHint = Double.MAX_VALUE;\r
+ if (hHint==null) hHint = Double.MAX_VALUE;\r
+\r
+ bounds.setFrame(0, 0, wHint, hHint);\r
+\r
+ Map<IElement, Rectangle2D> pos = computePositions(diagram, bounds, align, hgap, vgap);\r
+ double minX = Double.MAX_VALUE, minY = Double.MAX_VALUE, maxX = -Double.MAX_VALUE, maxY = -Double.MAX_VALUE;\r
+ for (IElement e : pos.keySet()) {\r
+ Rectangle2D b = pos.get(e);\r
+ if (b.getMinX() < minX) minX = b.getMinX();\r
+ if (b.getMinY() < minY) minY = b.getMinY();\r
+ if (b.getMaxX() > maxX) maxX = b.getMaxX();\r
+ if (b.getMaxY() > maxY) maxY = b.getMaxY();\r
+ }\r
+\r
+ return new Rectangle2D.Double(minX, minY, maxX-minX, maxY-minY);\r
+ }\r
+\r
+ private Map<IElement, Rectangle2D> computePositions(IDiagram diagram, Rectangle2D bounds, Align align, double hgap, double vgap)\r
+ {\r
+ double width = bounds.getWidth();\r
+\r
+ // Must use diagram.getSnapshot since we are not guaranteed to be in the\r
+ // diagram's canvas context thread.\r
+ Collection<IElement> elements = diagram.getSnapshot();\r
+ Map<IElement, Rectangle2D> rects = ElementUtils.getElementBoundsOnDiagram(elements, null);\r
+\r
+ // Rows\r
+ List<List<IElement>> rows = new ArrayList<List<IElement>>();\r
+\r
+ // Divide elements to rows\r
+ List<IElement> row = new ArrayList<IElement>();\r
+ rows.add(row);\r
+ double rowWidth = 0.0;\r
+ for (IElement e : elements)\r
+ {\r
+ Rectangle2D elementBounds = rects.get(e);\r
+\r
+ if (row.isEmpty()) {\r
+ row.add(e);\r
+ rowWidth += elementBounds.getWidth();\r
+ continue;\r
+ }\r
+\r
+ // Add element if it fits to the row\r
+ if (rowWidth + elementBounds.getWidth() + hgap*(row.size()) < width)\r
+ {\r
+ rowWidth += elementBounds.getWidth();\r
+ row.add(e);\r
+ continue;\r
+ }\r
+\r
+ // Create a new row\r
+ rows.add( row = new ArrayList<IElement>() );\r
+ row.add(e);\r
+ rowWidth = elementBounds.getWidth();\r
+ }\r
+\r
+ // Flush rows\r
+ double y = bounds.getMinY();\r
+ double hmargin = hgap;\r
+ for (List<IElement> row_ : rows) {\r
+ double rowHeight = 0;\r
+\r
+ // Calc row width\r
+ double rowContentWidth = (row.size()-1) * hgap;\r
+ for (IElement e : row)\r
+ rowContentWidth += rects.get(e).getWidth();\r
+\r
+ double x = hgap + bounds.getMinX();\r
+ double _hgap = hgap;\r
+ if (align == Align.Center) x = (width - hmargin - hmargin - rowContentWidth) / 2;\r
+ if (align == Align.Left) x = hmargin;\r
+ if (align == Align.Right) x = width-rowContentWidth-hmargin;\r
+ if (align == Align.Fill) {\r
+ x = hmargin;\r
+ _hgap = (width - hmargin - hmargin - rowContentWidth) / (row.size()+1);\r
+ //_hgap = 2;\r
+ }\r
+ for (IElement e : row_) {\r
+ Rectangle2D rect = rects.get(e);\r
+ rect.setFrame(x, y, rect.getWidth(), rect.getHeight());\r
+ x += rect.getWidth() + _hgap;\r
+ rowHeight = Math.max(rowHeight, rect.getHeight());\r
+ }\r
+\r
+ x = bounds.getMinX();\r
+ y += rowHeight + vgap;\r
+ }\r
+\r
+ return rects;\r
+ }\r
+\r
+\r
+}\r
Code Review / simantics / platform.git / blobdiff