зеркало из https://github.com/mozilla/gecko-dev.git
515 строки
14 KiB
Java
515 строки
14 KiB
Java
/* -*- Mode: java; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Mozilla Public License
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* Version 1.0 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS"
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* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
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* the License for the specific language governing rights and limitations
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* under the License.
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*
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* The Original Code is the Grendel mail/news client.
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*
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* The Initial Developer of the Original Code is Netscape Communications
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* Corporation. Portions created by Netscape are Copyright (C) 1997
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* Netscape Communications Corporation. All Rights Reserved.
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*
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* Created: Will Scullin <scullin@netscape.com>, 26 Aug 1997.
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*/
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package grendel.widgets;
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import java.awt.Color;
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import java.awt.Component;
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import java.awt.Container;
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import java.awt.Cursor;
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import java.awt.Dimension;
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import java.awt.Graphics;
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import java.awt.Insets;
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import java.awt.LayoutManager;
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import java.awt.LayoutManager2;
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import java.awt.Point;
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import java.awt.Rectangle;
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import java.awt.event.MouseAdapter;
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import java.awt.event.MouseEvent;
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import java.awt.event.MouseMotionListener;
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import java.util.Enumeration;
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import java.util.Hashtable;
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import java.util.Vector;
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import javax.swing.JComponent;
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import javax.swing.UIManager;
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/**
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* This class is used to create a divided pane with moveable dividers (NYI)
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* Components can be added with numeric weights that will determine how
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* much of the pane they will occupy:
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* <code>add(aComponent, new Float(.5))</code>
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* If no weight is given the default is 1.
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* <p>
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* (Soon to be) Moveable separators can be created by the
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* <code>createSeparator()</code>
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* method. The width of the separator is fixed in pixels.
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*
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* @author Will Scullin
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*/
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//
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// Splitter Class
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//
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public class Splitter extends JComponent {
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Hashtable fWeights = new Hashtable();
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float fTotalWeight = 0.0f;
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int fTotalSeparators = 0;
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int fOrientation;
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int fMinSize = 16;
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SplitterSeparatorListener fListener;
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/**
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* Value to pass for a splitter that stacks components
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* vertically.
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*/
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public static final int VERTICAL = 0;
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/**
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* Value to pass for a splitter that lays out components
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* horizontally.
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*/
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public static final int HORIZONTAL = 1;
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//
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// Constructor
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//
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/**
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* Contructs a splitter container with the given orientation.
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*/
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public Splitter(int aOrientation) {
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super();
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setLayout(new SplitterLayout());
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fOrientation = aOrientation;
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fListener = new SplitterSeparatorListener();
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updateUI();
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}
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public void updateUI() {
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super.updateUI();
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setBackground(UIManager.getColor("control"));
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}
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/**
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* Creates a separator of a given pixel size.
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*/
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public Component createSeparator(int aSize) {
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return new Separator(fOrientation, aSize, false);
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}
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/**
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* Creates an separator of a given pixel size. If aFixed is
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* true, the separator is not user movable.
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*/
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public Component createSeparator(int aSize, boolean aFixed) {
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return new Separator(fOrientation, aSize, aFixed);
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}
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/**
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* Returns the weight associated with a given component. This
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* number can be used to save and restore layout preferences.
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*/
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public Float getWeight(Component aComponent) {
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return (Float) fWeights.get(aComponent);
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}
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/**
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* Sets the minimum size a component can be sized to.
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* Should be greater than zero for best results.
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*/
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public void setMinSize(int aMinSize) {
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fMinSize = aMinSize;
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}
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/**
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* Returns the minimum size a component can be sized to.
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*/
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public int getMinSize() {
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return fMinSize;
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}
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//
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// SplitterLayout
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//
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class SplitterLayout implements LayoutManager2 {
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public void addLayoutComponent(String aString, Component aComponent) {
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addLayoutComponent(aComponent, new Float(1.0));
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}
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public void addLayoutComponent(Component aComponent, Object aObject) {
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if (aComponent instanceof Separator) {
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Separator sep = (Separator) aComponent;
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sep.addSeparatorListener(fListener);
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fTotalSeparators += sep.getSeparatorSize();
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} else {
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Number weight = null;
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if (aObject instanceof Number) {
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weight = new Float(((Number) aObject).floatValue());
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} else {
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weight = new Float(1.0f);
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}
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fTotalWeight += weight.floatValue();
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fWeights.put(aComponent, weight);
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}
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}
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public void removeLayoutComponent(Component aComponent) {
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if (aComponent instanceof Separator) {
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Separator sep = (Separator) aComponent;
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sep.removeSeparatorListener(fListener);
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fTotalSeparators -= sep.getSeparatorSize();
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} else {
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Float weight = (Float) fWeights.get(aComponent);
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fWeights.remove(aComponent);
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fTotalWeight -= weight.floatValue();
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}
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}
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public void layoutContainer(Container aParent) {
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int i, count = aParent.getComponentCount();
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Component components[] = aParent.getComponents();
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Dimension parentSize = aParent.getSize();
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Insets insets = aParent.getInsets();
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parentSize.width -= insets.left + insets.right;
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parentSize.height -= insets.top + insets.bottom;
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Dimension availableSize = new Dimension(parentSize);
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if (fOrientation == Splitter.VERTICAL) {
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availableSize.height -= fTotalSeparators;
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} else {
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availableSize.width -= fTotalSeparators;
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}
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Point pos = new Point(insets.left, insets.right);
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Dimension size = new Dimension(availableSize);
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for (i = 0; i < count; i++) {
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if (i == count - 1) {
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if (fOrientation == Splitter.VERTICAL) {
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size.height = parentSize.height - pos.y;
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} else {
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size.width = parentSize.width - pos.x;
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}
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} else {
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if (components[i] instanceof Separator) {
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if (fOrientation == Splitter.VERTICAL) {
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size.height = ((Separator) components[i]).getSeparatorSize();
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} else {
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size.width = ((Separator) components[i]).getSeparatorSize();
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}
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} else {
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float weight = ((Number) fWeights.get(components[i])).floatValue();
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if (fOrientation == Splitter.VERTICAL) {
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size.height = (int)(parentSize.height * (weight / fTotalWeight));
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} else {
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size.width = (int)(parentSize.width * (weight / fTotalWeight));
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}
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}
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}
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components[i].setLocation(pos);
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components[i].setSize(size);
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if (fOrientation == Splitter.VERTICAL) {
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pos.y += size.height;
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} else {
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pos.x += size.width;
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}
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}
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}
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public float getLayoutAlignmentX(Container aParent) {
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return 0.5f;
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}
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public float getLayoutAlignmentY(Container aParent) {
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return 0.5f;
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}
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public void invalidateLayout(Container aParent) {
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}
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public Dimension preferredLayoutSize(Container aParent) {
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return aParent.getSize();
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}
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public Dimension minimumLayoutSize(Container aParent) {
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return preferredLayoutSize(aParent);
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}
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public Dimension maximumLayoutSize(Container aParent) {
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return preferredLayoutSize(aParent);
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}
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}
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class SplitterSeparatorListener implements SeparatorListener {
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int fOldPos = -1;
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public boolean separatorMoving(Separator aSep, int aDelta) {
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Dimension size = aSep.getParent().getSize();
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Graphics g = getGraphics();
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int pos;
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if (fOrientation == VERTICAL) {
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pos = aSep.getY() + aDelta;
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if (pos < fMinSize)
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pos = fMinSize;
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else if (pos > (size.height - aSep.getHeight() - fMinSize))
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pos = size.height - aSep.getHeight() - fMinSize;
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} else {
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pos = aSep.getX() + aDelta;
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if (pos < fMinSize)
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pos = fMinSize;
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else if (pos > (size.width - aSep.getWidth() - fMinSize))
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pos = size.width - aSep.getWidth() - fMinSize;
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}
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drawDividerLine(g, pos, aSep.getSeparatorSize());
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return true;
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}
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public void separatorMoved(Separator aSep, int aDelta) {
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Graphics g = getGraphics();
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drawDividerLine(g, -1, aSep.getSeparatorSize());
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Component components[] = getComponents();
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int count = getComponentCount();
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float beforeValue = 0, afterValue = 0;
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int beforeSize = 0, afterSize = 0;
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boolean before = true;
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for (int i = 0; i < count; i++) {
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if (components[i] instanceof Separator) {
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if (components[i] == aSep) {
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before = false;
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}
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} else {
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Dimension dim = components[i].getSize();
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int size = fOrientation == VERTICAL ?
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dim.height :
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dim.width;
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float value = ((Number) fWeights.get(components[i])).floatValue();
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if (before) {
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beforeValue += value;
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beforeSize += size;
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} else {
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afterValue += value;
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afterSize += size;
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}
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}
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}
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Dimension size = aSep.getParent().getSize();
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int pos;
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if (fOrientation == VERTICAL) {
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pos = aSep.getY() + aDelta;
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if (pos < fMinSize)
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pos = fMinSize;
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else if (pos > (size.height - aSep.getHeight() - fMinSize))
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pos = size.height - aSep.getHeight() - fMinSize;
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aDelta = pos - aSep.getY();
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} else {
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pos = aSep.getX() + aDelta;
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if (pos < fMinSize)
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pos = fMinSize;
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else if (pos > (size.width - aSep.getWidth() - fMinSize))
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pos = size.width - aSep.getWidth() - fMinSize;
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aDelta = pos - aSep.getX();
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}
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float beforeDelta = (float) (beforeSize + aDelta) / (float) beforeSize;
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float afterDelta = (float) (afterSize - aDelta) / (float) afterSize;
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before = true;
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fTotalWeight = 0;
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for (int i = 0; i < count; i++) {
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if (components[i] instanceof Separator) {
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if (components[i] == aSep) {
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before = false;
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}
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} else {
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float value = ((Number) fWeights.get(components[i])).floatValue();
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if (before) {
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value *= beforeDelta;
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} else {
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value *= afterDelta;
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}
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fWeights.put(components[i], new Float(value));
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fTotalWeight += value;
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}
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}
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invalidate();
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validate();
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}
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void drawDividerLine(Graphics g, int aPos, int aSize) {
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g.setXORMode(Color.white);
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g.setColor(Color.black);
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if (fOldPos != -1) {
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if (fOrientation == VERTICAL) {
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g.fillRect(0, fOldPos, getWidth(), aSize);
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} else {
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g.fillRect(fOldPos, 0, aSize, getHeight());
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}
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}
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if (aPos != -1) {
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if (fOrientation == VERTICAL) {
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g.fillRect(0, aPos, getWidth(), aSize);
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} else {
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g.fillRect(aPos, 0, aSize, getHeight());
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}
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}
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fOldPos = aPos;
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g.setPaintMode();
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}
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}
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}
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//
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// SeparatorListener
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//
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interface SeparatorListener {
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public boolean separatorMoving(Separator aSep, int aDelta);
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public void separatorMoved(Separator aSep, int aDelta);
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}
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//
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// Separator Class
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//
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class Separator extends JComponent {
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int fOrientation;
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int fSize;
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SplitterMouseListener fMouseListener;
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SeparatorListener fListener;
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class SplitterMouseListener extends MouseAdapter implements MouseMotionListener {
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int hitX, hitY;
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boolean fDragging;
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int fDelta;
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public void mouseEntered(MouseEvent aEvent) {
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setCursor(Cursor.getPredefinedCursor(fOrientation == Splitter.VERTICAL ?
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Cursor.N_RESIZE_CURSOR :
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Cursor.E_RESIZE_CURSOR));
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}
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public void mousePressed(MouseEvent aEvent) {
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// XXX AWT bug work around
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// mousePressed gets called again if the cursor leaves the
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// frame. grr.
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if (!fDragging) {
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hitX = aEvent.getX();
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hitY = aEvent.getY();
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fDelta = 0;
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fDragging = true;
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}
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}
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public void mouseReleased(MouseEvent aEvent) {
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notifyMoved(fDelta);
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fDragging = false;
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}
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public void mouseMoved(MouseEvent aEvent) {
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}
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public void mouseDragged(MouseEvent aEvent) {
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int delta = fOrientation == Splitter.VERTICAL ?
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aEvent.getY() - hitY :
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aEvent.getX() - hitX;
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if (notifyMoving(delta)) {
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fDelta = delta;
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}
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}
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}
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public Separator(int aOrientation, int aSize, boolean aFixed) {
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fOrientation = aOrientation;
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fSize = aSize;
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if (!aFixed) {
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fMouseListener = new SplitterMouseListener();
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addMouseListener(fMouseListener);
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addMouseMotionListener(fMouseListener);
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}
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}
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public int getSeparatorSize() {
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return fSize;
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}
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public void paint(Graphics g) {
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Color bg = getBackground();
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if (bg != null) {
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Rectangle rect = getVisibleRect();
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g.setColor(bg);
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g.fillRect(rect.x, rect.y, rect.width, rect.height);
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}
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}
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public void addSeparatorListener(SeparatorListener aListener) {
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fListener = aListener;
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}
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public void removeSeparatorListener(SeparatorListener aListener) {
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if (aListener == fListener) {
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aListener = null;
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}
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}
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boolean notifyMoving(int aDelta) {
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if (fListener != null) {
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return fListener.separatorMoving(this, aDelta);
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}
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return true;
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}
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void notifyMoved(int aDelta) {
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if (fListener != null) {
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fListener.separatorMoved(this, aDelta);
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}
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}
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}
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