pjs/grendel/widgets/ColumnModelImp.java

286 строки
7.6 KiB
Java
Исходник Обычный вид История

1998-09-09 04:52:38 +04:00
/* -*- Mode: java; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.0 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* The Original Code is the Grendel mail/news client.
*
* The Initial Developer of the Original Code is Netscape Communications
* Corporation. Portions created by Netscape are Copyright (C) 1997
* Netscape Communications Corporation. All Rights Reserved.
*
* Created: Will Scullin <scullin@netscape.com>, 21 Aug 1997.
*/
package grendel.widgets;
import java.awt.AWTEventMulticaster;
import java.util.Vector;
import java.util.Enumeration;
import java.util.StringTokenizer;
import javax.swing.event.ChangeEvent;
1998-09-09 04:52:38 +04:00
public class ColumnModelImp implements ColumnModel, ColumnChangeListener {
Vector fColumns = new Vector();
ColumnModelListener fListeners = null;
int fMargin = 0;
Column fSelectedColumn = null;
public void addColumn(Column aColumn) {
addColumnAt(aColumn, fColumns.size());
}
public void addColumnAt(Column aColumn, int aIndex) {
aColumn.addColumnChangeListener(this);
fColumns.insertElementAt(aColumn, aIndex);
if (fListeners != null) {
fListeners.columnAdded(new ColumnModelEvent(this, 0, aIndex));
}
}
public void removeColumn(Column aColumn) {
aColumn.removeColumnChangeListener(this);
int idx = getColumnIndex(aColumn);
if (idx > -1) {
fColumns.removeElementAt(idx);
if (fListeners != null) {
fListeners.columnRemoved(new ColumnModelEvent(this, idx, 0));
}
}
}
public void moveColumn(int aSource, int aDest) {
int i;
if (aSource < aDest) {
for (i = aSource; i < aDest; i++) {
Object a = fColumns.elementAt(i);
fColumns.removeElementAt(i);
fColumns.insertElementAt(a, i + 1);
}
if (fListeners != null) {
fListeners.columnMoved(new ColumnModelEvent(this, aSource, aDest));
}
} else if (aDest < aSource) {
for (i = aSource; i > aDest; i--) {
Object a = fColumns.elementAt(i);
fColumns.removeElementAt(i);
fColumns.insertElementAt(a, i - 1);
}
if (fListeners != null) {
fListeners.columnMoved(new ColumnModelEvent(this, aSource, aDest));
}
} // else same, do nothing
}
public int getColumnCount() {
return fColumns.size();
}
public Column getColumn(int aIndex) {
return (Column) fColumns.elementAt(aIndex);
}
public Column getColumn(Object aID) {
int count = getColumnCount();
for (int i = 0; i < count; i++) {
Column column = getColumn(i);
if (column.getID().equals(aID)) {
return column;
}
}
return null;
}
private Column getColumn(String aID) {
int count = getColumnCount();
for (int i = 0; i < count; i++) {
Column column = getColumn(i);
if (column.getID().toString().equals(aID)) {
return column;
}
}
return null;
}
public Enumeration getColumns() {
return fColumns.elements();
}
public int getColumnIndex(Column aColumn) {
return fColumns.indexOf(aColumn);
}
public int getColumnIndexAtX(int aX) {
if (aX < 0) {
return -1;
}
int count = getColumnCount();
int width = 0;
for (int i = 0; i < count; i++) {
Column column = getColumn(i);
width += column.getWidth() + fMargin;
if (aX <= width) {
return i;
}
}
return -1;
}
public void setColumnMargin(int aMargin) {
fMargin = aMargin;
if (fListeners != null) {
fListeners.columnMarginChanged(new ChangeEvent(this));
}
}
public int getColumnMargin() {
return fMargin;
}
public int getTotalColumnWidth() {
int i, res = 0;
for (i = 0; i < fColumns.size(); i++) {
res += getColumn(i).getWidth() + fMargin;
}
return res;
}
public void setSelectedColumn(Column aColumn) {
fSelectedColumn = aColumn;
if (fListeners != null) {
fListeners.columnSelectionChanged(new ChangeEvent(this));
}
}
public Column getSelectedColumn() {
return fSelectedColumn;
}
public synchronized String getPrefString() {
StringBuffer pref = new StringBuffer();
Integer intVal = new Integer(0);
for (int i = 0; i < fColumns.size(); i++) {
pref.append(getColumn(i).getID().toString());
pref.append(",");
pref.append(Integer.toString(getColumn(i).getWidth()));
if (i < fColumns.size() - 1) {
pref.append(",");
}
}
return pref.toString();
}
public synchronized void setPrefString(String aString) {
StringTokenizer tokens = new StringTokenizer(aString, ",", false);
int i = 0;
while (tokens.hasMoreTokens()) {
String id = tokens.nextToken();
String width = tokens.nextToken();
Column column = getColumn(id);
if (column != null) {
column.setWidth(Integer.parseInt(width));
moveColumn(getColumnIndex(column), i);
}
i++;
}
}
//
// Listener support
//
public synchronized void addColumnModelListener(ColumnModelListener aListener) {
fListeners = ColumnModelMulticaster.add(fListeners, aListener);
}
public synchronized void removeColumnModelListener(ColumnModelListener aListener) {
fListeners = ColumnModelMulticaster.remove(fListeners, aListener);
}
//
// ColumnListener Interface
//
public void columnWidthChanged(ChangeEvent aEvent) {
int idx = fColumns.indexOf(aEvent.getSource());
if (fListeners != null) {
fListeners.columnWidthChanged(new ColumnModelEvent(this, 0, idx));
}
}
}
class ColumnModelMulticaster implements ColumnModelListener {
ColumnModelListener a, b;
public ColumnModelMulticaster(ColumnModelListener a, ColumnModelListener b) {
this.a = a;
this.b = b;
}
public static ColumnModelListener add(ColumnModelListener a, ColumnModelListener b) {
if (a == null) return b;
if (b == null) return a;
return new ColumnModelMulticaster(a, b);
}
public static ColumnModelListener remove(ColumnModelListener a, ColumnModelListener b) {
if (a == b || a == null) {
return null;
} else if (a instanceof ColumnModelMulticaster) {
return ((ColumnModelMulticaster)a).remove(b);
} else {
return a; // it's not here
}
}
public ColumnModelListener remove(ColumnModelListener c) {
if (c == a) return b;
if (c == b) return a;
ColumnModelListener a2 = remove(a, c);
ColumnModelListener b2 = remove(b, c);
if (a2 == a && b2 == b) {
return this; // it's not here
}
return add(a2, b2);
}
public void columnAdded(ColumnModelEvent aEvent) {
a.columnAdded(aEvent);
b.columnAdded(aEvent);
}
public void columnRemoved(ColumnModelEvent aEvent) {
a.columnRemoved(aEvent);
b.columnRemoved(aEvent);
}
public void columnMoved(ColumnModelEvent aEvent) {
a.columnMoved(aEvent);
b.columnMoved(aEvent);
}
public void columnMarginChanged(ChangeEvent aEvent) {
a.columnMarginChanged(aEvent);
b.columnMarginChanged(aEvent);
}
public void columnSelectionChanged(ChangeEvent aEvent) {
a.columnSelectionChanged(aEvent);
b.columnSelectionChanged(aEvent);
}
public void columnWidthChanged(ColumnModelEvent aEvent) {
a.columnWidthChanged(aEvent);
b.columnWidthChanged(aEvent);
}
}