зеркало из https://github.com/mozilla/pjs.git
435 строки
11 KiB
Java
435 строки
11 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>, 21 Aug 1997.
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*
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* Contributors: Jeff Galyan <talisman@anamorphic.com>
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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.Cursor;
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import java.awt.Dimension;
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import java.awt.Font;
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import java.awt.Graphics;
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import java.awt.event.MouseEvent;
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import java.awt.event.MouseListener;
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import java.awt.event.MouseMotionListener;
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import java.util.Enumeration;
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import javax.swing.CellRendererPane;
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import javax.swing.JComponent;
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import javax.swing.UIManager;
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import javax.swing.event.ChangeEvent;
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public class ColumnHeader extends JComponent implements ColumnModelListener {
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ColumnModel fColumnModel;
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CellRendererPane fCellRendererPane = new CellRendererPane();
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static final int RESIZE_MARGIN = 4;
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static final int DRAG_THRESHOLD = 4;
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boolean fDynamicUpdate = true;
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// Set by hit test
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boolean fOverResize;
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int fHitOffset;
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Column fPressedColumn;
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HeaderMouseListener fMouseListener;
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//
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// HeaderMouseListener
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//
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class HeaderMouseListener implements MouseMotionListener, MouseListener {
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boolean fResizing;
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int fOverColumn;
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int fDragOverColumn;
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int fHitX;
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int fHitColumn;
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int fOldSize;
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int fOldDragX = -1;
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int fDragOffset;
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boolean fDragging;
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// MouseMotionListener Interface
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public void mouseMoved(MouseEvent aEvent) {
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fOverColumn = hitTest(aEvent.getX());
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if (fOverResize) {
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setCursor(Cursor.getPredefinedCursor(Cursor.E_RESIZE_CURSOR));
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} else {
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setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
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}
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}
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public void mouseDragged(MouseEvent aEvent) {
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if (fHitColumn < 0) {
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return;
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}
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int x = aEvent.getX();
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if (fResizing) {
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if (fDynamicUpdate) {
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updateColumnSize(x);
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} else {
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paintResizeLine(x);
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}
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} else if (Math.abs(x - fHitX) > DRAG_THRESHOLD) {
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fDragging = true;
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fDragOverColumn = hitTest(x);
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if (fDynamicUpdate) {
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int threshhold = 0;
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if (fDragOverColumn != -1) {
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if (fDragOverColumn < fHitColumn) {
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threshhold = getColumnX(fDragOverColumn) +
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fColumnModel.getColumn(fHitColumn).getWidth();
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} else {
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threshhold = getColumnX(fDragOverColumn) +
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fColumnModel.getColumn(fDragOverColumn).getWidth() -
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fColumnModel.getColumn(fHitColumn).getWidth();
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}
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}
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if (fDragOverColumn != -1 &&
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((fDragOverColumn < fHitColumn &&
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aEvent.getX() < threshhold) ||
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(fDragOverColumn > fHitColumn &&
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aEvent.getX() > threshhold))) {
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paintDraggedHeader(-1);
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fColumnModel.moveColumn(fHitColumn, fDragOverColumn);
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fHitColumn = fDragOverColumn;
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} else {
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paintDraggedHeader(aEvent.getX() + fDragOffset);
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}
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} else {
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paintDraggedHeader(aEvent.getX() + fDragOffset);
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}
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}
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}
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// MouseListener Interface
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public void mouseEntered(MouseEvent aEvent) {
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}
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public void mouseExited(MouseEvent aEvent) {
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}
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public void mouseClicked(MouseEvent aEvent) {
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}
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public void mousePressed(MouseEvent aEvent) {
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fHitX = aEvent.getX();
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fHitColumn = fOverColumn;
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if (fHitColumn > -1) {
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Column column = fColumnModel.getColumn(fHitColumn);
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if (fOverResize) {
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fResizing = true;
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fOldSize = column.getWidth();
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} else {
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fDragOffset = fHitOffset;
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if (column.isSelectable()) {
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fPressedColumn = column;
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repaint();
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}
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}
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}
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}
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public void mouseReleased(MouseEvent aEvent) {
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if (fResizing && !fDynamicUpdate) {
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paintResizeLine(-1);
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updateColumnSize(aEvent.getX());
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} else if (fDragging) {
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fDragging = false;
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paintDraggedHeader(-1);
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if (!fDynamicUpdate) {
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if (fDragOverColumn != fHitColumn && fDragOverColumn != -1) {
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fColumnModel.moveColumn(fHitColumn, fDragOverColumn);
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}
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}
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} else {
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if (fPressedColumn != null) {
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fColumnModel.setSelectedColumn(fPressedColumn);
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}
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}
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fHitX = -1;
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fHitColumn = -1;
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fResizing = false;
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fPressedColumn = null;
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repaint();
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}
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void updateColumnSize(int aMouseX) {
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Column column = fColumnModel.getColumn(fHitColumn);
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int newSize = fOldSize + (aMouseX - fHitX);
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if (newSize >= column.getMinWidth() &&
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newSize <= column.getMaxWidth()) {
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column.setWidth(newSize);
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}
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}
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void paintResizeLine(int aMouseX) {
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Graphics g = getGraphics();
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g.setXORMode(Color.white);
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g.setColor(Color.black);
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if (fOldDragX > -1) {
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g.drawLine(fOldDragX, 0, fOldDragX, getHeight());
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}
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if (aMouseX > -1) {
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g.drawLine(aMouseX, 0, aMouseX, getHeight());
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}
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g.setPaintMode();
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fOldDragX = aMouseX;
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}
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void paintDraggedHeader(int aMouseX) {
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Graphics g = getGraphics();
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g.setXORMode(Color.white);
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Column column = fColumnModel.getColumn(fHitColumn);
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int w, h;
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w = column.getWidth();
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h = getHeight();
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HeaderRenderer renderer = column.getHeaderRenderer();
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renderer.setValue(column, HeaderRenderer.DRAGGING);
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Component component = renderer.getComponent();
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if (fOldDragX > -1) {
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paintComponent(g, component, fOldDragX, 0, w, h);
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}
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if (aMouseX > -1) {
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paintComponent(g, component, aMouseX, 0, w, h);
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}
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g.setPaintMode();
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fOldDragX = aMouseX;
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}
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int getColumnX(int aIdx) {
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int res = 0;
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for (int i = 0; i < aIdx; i++) {
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res += fColumnModel.getColumn(i).getWidth();
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}
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return res;
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}
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}
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//
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// Constructor
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//
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/**
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* Takes a ColumnModel. The ColumnModel is generally shared with whatever
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* is the column header for.
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*/
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public ColumnHeader(ColumnModel aColumnModel) {
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add(fCellRendererPane);
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fColumnModel = aColumnModel;
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fColumnModel.addColumnModelListener(this);
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updateUI();
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fMouseListener = new HeaderMouseListener();
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addMouseListener(fMouseListener);
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addMouseMotionListener(fMouseListener);
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}
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/**
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* Sets whether the UI repaints all columns as a column is
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* being resized or dragged. Set to false for better performance.
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*/
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public void setDynamicUpdate(boolean aDynamic) {
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fDynamicUpdate = aDynamic;
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}
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/**
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* @return Whether the UI is repainting the columns as a column
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* is being sized or dragged.
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*/
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public boolean getDynamicUpdate() {
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return fDynamicUpdate;
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}
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//
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// Utility methods
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//
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int hitTest(int aX) {
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if (aX < 0) {
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return -1;
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}
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int index = 0;
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int w = 0;
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fOverResize = false;
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Enumeration columns = fColumnModel.getColumns();
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while (columns.hasMoreElements()) {
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Column column = (Column) columns.nextElement();
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w += column.getWidth();
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if (aX < w) {
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if (aX > w - RESIZE_MARGIN) {
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fOverResize = true;
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}
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fHitOffset = w - column.getWidth() - aX;
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return index;
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}
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index++;
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}
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return -1;
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}
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void paintComponent(Graphics g, Component component,
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int x, int y, int w, int h) {
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fCellRendererPane.paintComponent(g, component, this, x, y, w, h);
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}
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//
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// ColumnModelListener Interface
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//
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public void columnAdded(ColumnModelEvent e) {
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resizeAndRepaint();
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}
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public void columnRemoved(ColumnModelEvent e) {
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resizeAndRepaint();
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}
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public void columnMoved(ColumnModelEvent e) {
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repaint();
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}
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public void columnMarginChanged(ChangeEvent e) {
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resizeAndRepaint();
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}
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public void columnWidthChanged(ColumnModelEvent e) {
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resizeAndRepaint();
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}
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public void columnSelectionChanged(ChangeEvent e) {
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repaint();
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}
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void resizeAndRepaint() {
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setSize(getPreferredSize());
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repaint();
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}
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//
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// Component Overloads
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//
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public void paint(Graphics g) {
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int margin = fColumnModel.getColumnMargin();
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int x = 0, y = 0;
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int w = 0, h = getHeight();
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Color bg = getBackground();
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for (Enumeration columnEnum = fColumnModel.getColumns();
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columnEnum.hasMoreElements(); ) {
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Column column = (Column) columnEnum.nextElement();
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// Easy Part
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w = column.getWidth() + margin;
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if (bg != null) {
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g.setColor(bg);
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g.fillRect(x, y, w, h);
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}
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// Hard Part
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HeaderRenderer renderer = column.getHeaderRenderer();
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if (column == fPressedColumn) {
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renderer.setValue(column, HeaderRenderer.DEPRESSED);
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} else if (column == fColumnModel.getSelectedColumn()) {
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renderer.setValue(column, HeaderRenderer.SELECTED);
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} else {
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renderer.setValue(column, HeaderRenderer.NORMAL);
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}
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Component component = renderer.getComponent();
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fCellRendererPane.paintComponent(g, component, this, x, y, w, h);
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x += w;
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}
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if (x < getWidth()) {
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if (bg != null) {
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g.setColor(bg);
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g.fillRect(x, y, getWidth() - x, h);
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}
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}
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}
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public Dimension getPreferredSize() {
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Dimension res = new Dimension();
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int margin = fColumnModel.getColumnMargin();
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for (Enumeration columnEnum = fColumnModel.getColumns();
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columnEnum.hasMoreElements(); ) {
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Column column = (Column) columnEnum.nextElement();
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// Easy Part
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res.width += column.getWidth() + margin;
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// Hard Part
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HeaderRenderer renderer = column.getHeaderRenderer();
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renderer.setValue(column, HeaderRenderer.NORMAL);
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Component component = renderer.getComponent();
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Dimension dim = component.getPreferredSize();
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if (dim.height > res.height) {
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res.height = dim.height;
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}
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}
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return res;
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}
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public Dimension getMinimumSize() {
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return getPreferredSize();
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}
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public Dimension getMaximumSize() {
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return getPreferredSize();
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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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