Mercurial > projects > dwt-win
view dwt/layout/FillLayout.d @ 48:9a64a7781bab
Added override and alias, first chunk. Thanks torhu for doing this patch.
author | Frank Benoit <benoit@tionex.de> |
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date | Sun, 03 Feb 2008 01:14:54 +0100 |
parents | 92c102dd64a3 |
children | d0bbd290530f |
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/******************************************************************************* * Copyright (c) 2000, 2006 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 dwt.layout.FillLayout; import dwt.DWT; import dwt.graphics.Point; import dwt.graphics.Rectangle; import dwt.widgets.Control; import dwt.widgets.Layout; import dwt.widgets.Composite; import dwt.widgets.Scrollable; import dwt.layout.FillData; import tango.text.Util; import tango.util.Convert; import dwt.dwthelper.utils; /** * <code>FillLayout</code> is the simplest layout class. It lays out * controls in a single row or column, forcing them to be the same size. * <p> * Initially, the controls will all be as tall as the tallest control, * and as wide as the widest. <code>FillLayout</code> does not wrap, * but you can specify margins and spacing. You might use it to * lay out buttons in a task bar or tool bar, or to stack checkboxes * in a <code>Group</code>. <code>FillLayout</code> can also be used * when a <code>Composite</code> only has one child. For example, * if a <code>Shell</code> has a single <code>Group</code> child, * <code>FillLayout</code> will cause the <code>Group</code> to * completely fill the <code>Shell</code> (if margins are 0). * </p> * <p> * Example code: first a <code>FillLayout</code> is created and * its type field is set, and then the layout is set into the * <code>Composite</code>. Note that in a <code>FillLayout</code>, * children are always the same size, and they fill all available space. * <pre> * FillLayout fillLayout = new FillLayout(); * fillLayout.type = DWT.VERTICAL; * shell.setLayout(fillLayout); * </pre> * </p> */ public final class FillLayout : Layout { /** * type specifies how controls will be positioned * within the layout. * * The default value is HORIZONTAL. * * Possible values are: <ul> * <li>HORIZONTAL: Position the controls horizontally from left to right</li> * <li>VERTICAL: Position the controls vertically from top to bottom</li> * </ul> */ public int type = DWT.HORIZONTAL; /** * marginWidth specifies the number of pixels of horizontal margin * that will be placed along the left and right edges of the layout. * * The default value is 0. * * @since 3.0 */ public int marginWidth = 0; /** * marginHeight specifies the number of pixels of vertical margin * that will be placed along the top and bottom edges of the layout. * * The default value is 0. * * @since 3.0 */ public int marginHeight = 0; /** * spacing specifies the number of pixels between the edge of one cell * and the edge of its neighbouring cell. * * The default value is 0. * * @since 3.0 */ public int spacing = 0; /** * Constructs a new instance of this class. */ public this () { } /** * Constructs a new instance of this class given the type. * * @param type the type of fill layout * * @since 2.0 */ public this (int type) { this.type = type; } override protected Point computeSize (Composite composite, int wHint, int hHint, bool flushCache) { Control [] children = composite.getChildren (); int count = children.length; int maxWidth = 0, maxHeight = 0; for (int i=0; i<count; i++) { Control child = children [i]; int w = wHint, h = hHint; if (count > 0) { if (type is DWT.HORIZONTAL && wHint !is DWT.DEFAULT) { w = Math.max (0, (wHint - (count - 1) * spacing) / count); } if (type is DWT.VERTICAL && hHint !is DWT.DEFAULT) { h = Math.max (0, (hHint - (count - 1) * spacing) / count); } } Point size = computeChildSize (child, w, h, flushCache); maxWidth = Math.max (maxWidth, size.x); maxHeight = Math.max (maxHeight, size.y); } int width = 0, height = 0; if (type is DWT.HORIZONTAL) { width = count * maxWidth; if (count !is 0) width += (count - 1) * spacing; height = maxHeight; } else { width = maxWidth; height = count * maxHeight; if (count !is 0) height += (count - 1) * spacing; } width += marginWidth * 2; height += marginHeight * 2; if (wHint !is DWT.DEFAULT) width = wHint; if (hHint !is DWT.DEFAULT) height = hHint; return new Point (width, height); } Point computeChildSize (Control control, int wHint, int hHint, bool flushCache) { FillData data = cast(FillData)control.getLayoutData (); if (data is null) { data = new FillData (); control.setLayoutData (data); } Point size = null; if (wHint is DWT.DEFAULT && hHint is DWT.DEFAULT) { size = data.computeSize (control, wHint, hHint, flushCache); } else { // TEMPORARY CODE int trimX, trimY; if ( auto sa = cast(Scrollable)control ) { Rectangle rect = sa.computeTrim (0, 0, 0, 0); trimX = rect.width; trimY = rect.height; } else { trimX = trimY = control.getBorderWidth () * 2; } int w = wHint is DWT.DEFAULT ? wHint : Math.max (0, wHint - trimX); int h = hHint is DWT.DEFAULT ? hHint : Math.max (0, hHint - trimY); size = data.computeSize (control, w, h, flushCache); } return size; } override protected bool flushCache (Control control) { Object data = control.getLayoutData(); if (data !is null) (cast(FillData)data).flushCache(); return true; } char[] getName () { char[] string = this.classinfo.name; int index = locatePrior( string, '.'); if (index is string.length ) return string; return string[ index + 1 .. string.length ]; } override protected void layout (Composite composite, bool flushCache) { Rectangle rect = composite.getClientArea (); Control [] children = composite.getChildren (); int count = children.length; if (count is 0) return; int width = rect.width - marginWidth * 2; int height = rect.height - marginHeight * 2; if (type is DWT.HORIZONTAL) { width -= (count - 1) * spacing; int x = rect.x + marginWidth, extra = width % count; int y = rect.y + marginHeight, cellWidth = width / count; for (int i=0; i<count; i++) { Control child = children [i]; int childWidth = cellWidth; if (i is 0) { childWidth += extra / 2; } else { if (i is count - 1) childWidth += (extra + 1) / 2; } child.setBounds (x, y, childWidth, height); x += childWidth + spacing; } } else { height -= (count - 1) * spacing; int x = rect.x + marginWidth, cellHeight = height / count; int y = rect.y + marginHeight, extra = height % count; for (int i=0; i<count; i++) { Control child = children [i]; int childHeight = cellHeight; if (i is 0) { childHeight += extra / 2; } else { if (i is count - 1) childHeight += (extra + 1) / 2; } child.setBounds (x, y, width, childHeight); y += childHeight + spacing; } } } /** * Returns a string containing a concise, human-readable * description of the receiver. * * @return a string representation of the layout */ override public char[] toString () { char[] string = getName () ~ " {"; string ~= "type="~((type is DWT.VERTICAL) ? "DWT.VERTICAL" : "DWT.HORIZONTAL")~" "; if (marginWidth !is 0) string ~= "marginWidth="~to!(char[])(marginWidth)~" "; if (marginHeight !is 0) string ~= "marginHeight="~to!(char[])(marginHeight)~" "; if (spacing !is 0) string ~= "spacing="~to!(char[])(spacing)~" "; string = trim( string ); string ~= "}"; return string; } }