platform/platform-impl/src/com/intellij/openapi/fileEditor/impl/FileEditorInfoPane.java

   1 /*
   2  * Copyright 2000-2009 JetBrains s.r.o.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 package com.intellij.openapi.fileEditor.impl;
  18
  19 import com.intellij.ui.IdeBorderFactory;
  20
  21 import javax.swing.*;
  22 import java.awt.*;
  23 import java.awt.event.ActionEvent;
  24 import java.awt.event.ActionListener;
  25 import java.util.ArrayList;
  26
  27 /**
  28  * @author max
  29  */
  30 public class FileEditorInfoPane extends JPanel {
  31   private int myCounter = 0;
  32   private final JPanel myCards;
  33   private final JButton myPrevButton;
  34   private final JButton myNextButton;
  35   private final java.util.List<JComponent> myComponents;
  36   private final JPanel myButtonsPanel;
  37
  38   public FileEditorInfoPane() {
  39     super(new BorderLayout());
  40     final CardLayout layout = new CardLayout();
  41     myCards = new JPanel(layout);
  42     myComponents = new ArrayList<JComponent>();
  43     add(myCards, BorderLayout.CENTER);
  44     myPrevButton = new JButton("<");
  45     myNextButton = new JButton(">");
  46
  47     myButtonsPanel = new JPanel(new GridLayout(1, 2));
  48     myButtonsPanel.add(myPrevButton);
  49     myButtonsPanel.add(myNextButton);
  50
  51     myPrevButton.addActionListener(new ActionListener() {
  52       public void actionPerformed(ActionEvent e) {
  53         layout.previous(myCards);
  54         updateButtons();
  55       }
  56     });
  57
  58     myNextButton.addActionListener(new ActionListener() {
  59       public void actionPerformed(ActionEvent e) {
  60         layout.next(myCards);
  61         updateButtons();
  62       }
  63     });
  64     setBorder(IdeBorderFactory.createBorder());
  65
  66     add(myButtonsPanel, BorderLayout.EAST);
  67     myButtonsPanel.setVisible(false);
  68     setVisible(false);
  69   }
  70
  71   public void addInfo(JComponent component) {
  72     myComponents.add(component);
  73     myCards.add(component, String.valueOf(myCounter++));
  74     updateButtons();
  75     validate();
  76   }
  77
  78   public void removeInfo(JComponent component) {
  79     myComponents.remove(component);
  80     myCards.remove(component);
  81     updateButtons();
  82     validate();
  83   }
  84
  85   private int getCurrentCard() {
  86     for (int i = 0; i < myComponents.size(); i++) {
  87       if (myComponents.get(i).isVisible()) return i;
  88     }
  89     return -1;
  90   }
  91
  92   private void updateButtons() {
  93     int count = myComponents.size();
  94     if (count > 0) {
  95       setVisible(true);
  96       if (count == 1) {
  97         myButtonsPanel.setVisible(false);
  98       }
  99       else {
 100         myButtonsPanel.setVisible(true);
 101         int currentCard = getCurrentCard();
 102         myNextButton.setEnabled(currentCard + 1 < count);
 103         myPrevButton.setEnabled(currentCard - 1 >= 0);
 104       }
 105     }
 106     else {
 107       setVisible(false);
 108     }
 109   }
 110 }