Mercurial > projects > dwt-addons
view dwtx/draw2d/text/FlowContainerLayout.d @ 98:95307ad235d9
Added Draw2d code, still work in progress
author | Frank Benoit <benoit@tionex.de> |
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date | Sun, 03 Aug 2008 00:52:14 +0200 |
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/******************************************************************************* * Copyright (c) 2000, 2005 IBM Corporation 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: * IBM Corporation - initial API and implementation * Port to the D programming language: * Frank Benoit <benoit@tionex.de> *******************************************************************************/ module dwtx.draw2d.text.FlowContainerLayout; import dwt.dwthelper.utils; import dwtx.dwtxhelper.Collection; import dwtx.draw2d.Figure; import dwtx.draw2d.text.FlowFigureLayout; import dwtx.draw2d.text.FlowBox; import dwtx.draw2d.text.LineBox; import dwtx.draw2d.text.FlowContext; import dwtx.draw2d.text.FlowFigure; /** * A layout for FlowFigures with children. * * <P>WARNING: This class is not intended to be subclassed by clients. * @author hudsonr * @since 2.1 */ public abstract class FlowContainerLayout : FlowFigureLayout , FlowContext { /** * the current line */ LineBox currentLine; /** * @see dwtx.draw2d.text.FlowFigureLayout#FlowFigureLayout(FlowFigure) */ protected this(FlowFigure flowFigure) { super(flowFigure); } /** * Adds the given box the current line and clears the context's state. * @see dwtx.draw2d.text.FlowContext#addToCurrentLine(FlowBox) */ public void addToCurrentLine(FlowBox child) { getCurrentLine().add(child); setContinueOnSameLine(false); } /** * Flush anything pending and free all temporary data used during layout. */ protected void cleanup() { currentLine = null; } /** * Used by getCurrentLine(). */ protected abstract void createNewLine(); /** * Called after {@link #layoutChildren()} when all children have been laid out. This * method exists to flush the last line. */ protected abstract void flush(); /** * FlowBoxes shouldn't be added directly to the current line. Use * {@link #addToCurrentLine(FlowBox)} for that. * @see dwtx.draw2d.text.FlowContext#getCurrentLine() */ LineBox getCurrentLine() { if (currentLine is null) createNewLine(); return currentLine; } /** * @see FlowContext#getRemainingLineWidth() */ public int getRemainingLineWidth() { return getCurrentLine().getAvailableWidth(); } /** * @see FlowContext#isCurrentLineOccupied() */ public bool isCurrentLineOccupied() { return currentLine !is null && currentLine.isOccupied(); } /** * @see FlowFigureLayout#layout() */ protected void layout() { preLayout(); layoutChildren(); flush(); cleanup(); } /** * Layout all children. */ protected void layoutChildren() { List children = getFlowFigure().getChildren(); for (int i = 0; i < children.size(); i++) { Figure f = cast(Figure)children.get(i); if (forceChildInvalidation(f)) f.invalidate(); f.validate(); } } bool forceChildInvalidation(Figure f) { return true; } /** * Called before layoutChildren() to setup any necessary state. */ protected abstract void preLayout(); }