python/educational-core/student/src/com/jetbrains/edu/learning/ui/CCCreateAnswerPlaceholderPanel.java

   1 package com.jetbrains.edu.learning.ui;
   2
   3 import com.intellij.icons.AllIcons;
   4 import com.intellij.openapi.actionSystem.ActionManager;
   5 import com.intellij.openapi.actionSystem.AnAction;
   6 import com.intellij.openapi.actionSystem.AnActionEvent;
   7 import com.intellij.openapi.actionSystem.DefaultActionGroup;
   8 import com.intellij.ui.ColorUtil;
   9 import com.intellij.ui.JBColor;
  10 import com.intellij.ui.components.JBLabel;
  11 import com.intellij.uiDesigner.core.GridLayoutManager;
  12 import com.intellij.util.ui.UIUtil;
  13 import org.jetbrains.annotations.NotNull;
  14
  15 import javax.swing.*;
  16 import java.awt.*;
  17 import java.awt.event.FocusAdapter;
  18 import java.awt.event.FocusEvent;
  19 import java.util.ArrayList;
  20 import java.util.List;
  21
  22 public class CCCreateAnswerPlaceholderPanel {
  23   private static final String NEXT_HINT = "Next Hint";
  24   private static final String PREVIOUS_HINT = "Previous Hint";
  25   private static final String ADD_HINT = "Add Hint";
  26   private static final String REMOVE_HINT = "Remove Hint";
  27   private static final String HINT_PLACEHOLDER = "Type here to add hint";
  28
  29   private JPanel myPanel;
  30   private JTextArea myHintTextArea;
  31   private JPanel myHintsPanel;
  32   private JBLabel myHintLabel;
  33   private JPanel actionsPanel;
  34   private JTextArea myPlaceholderTextArea;
  35   private List<String> myHints = new ArrayList<>();
  36   private int myShownHintNumber = 0;
  37
  38   public CCCreateAnswerPlaceholderPanel(String placeholderText, List<String> hints) {
  39     if (hints.isEmpty()) {
  40       myHints.add(HINT_PLACEHOLDER);
  41     }
  42     else {
  43       myHints.addAll(hints);
  44     }
  45
  46     myPlaceholderTextArea.setBorder(BorderFactory.createLineBorder(JBColor.border()));
  47     myHintsPanel.setBorder(BorderFactory.createLineBorder(JBColor.border()));
  48     ((GridLayoutManager)myHintsPanel.getLayout()).setHGap(1);
  49
  50     myHintTextArea.setFont(myPlaceholderTextArea.getFont());
  51     myHintTextArea.addFocusListener(createFocusListenerToSetDefaultHintText());
  52
  53     actionsPanel.add(createHintToolbarComponent(), BorderLayout.WEST);
  54     showHint(myHints.get(myShownHintNumber));
  55     myPlaceholderTextArea.setText(placeholderText);
  56   }
  57
  58   @NotNull
  59   private FocusAdapter createFocusListenerToSetDefaultHintText() {
  60     return new FocusAdapter() {
  61       @Override
  62       public void focusGained(FocusEvent e) {
  63         if (myHintTextArea.getText().equals(HINT_PLACEHOLDER)) {
  64           myHintTextArea.setForeground(UIUtil.getActiveTextColor());
  65           myHintTextArea.setText("");
  66         }
  67       }
  68
  69       @Override
  70       public void focusLost(FocusEvent e) {
  71         if (myShownHintNumber == 0 && myHintTextArea.getText().isEmpty()) {
  72           myHintTextArea.setForeground(UIUtil.getInactiveTextColor());
  73           myHintTextArea.setText(HINT_PLACEHOLDER);
  74         }
  75       }
  76     };
  77   }
  78
  79   private JComponent createHintToolbarComponent() {
  80     final DefaultActionGroup addRemoveGroup = new DefaultActionGroup();
  81     addRemoveGroup.addAll(new AddHint(), new RemoveHint(), new ShowNext(), new ShowPrevious());
  82     return ActionManager.getInstance().createActionToolbar("Hint", addRemoveGroup, false).getComponent();
  83   }
  84
  85   private void updateHintNumberLabel() {
  86     if (myHints.size() > 1) {
  87       final String color = String.valueOf(ColorUtil.toHex(UIUtil.getHeaderInactiveColor()));
  88       myHintLabel.setText(UIUtil.toHtml("Hint" + " <font color=\"" + color + "\">(" + (myShownHintNumber + 1) + "/" + myHints.size() + ")</font>:"));
  89     }
  90     else {
  91       myHintLabel.setText("Hint: ");
  92     }
  93   }
  94
  95   public void showHint(String hintText) {
  96     if (myHints.get(myShownHintNumber).equals(HINT_PLACEHOLDER)) {
  97       myHintTextArea.setForeground(UIUtil.getInactiveTextColor());
  98     }
  99     else {
 100       myHintTextArea.setForeground(UIUtil.getActiveTextColor());
 101     }
 102
 103     myHintTextArea.setText(hintText);
 104     updateHintNumberLabel();
 105   }
 106
 107   public String getAnswerPlaceholderText() {
 108     return myPlaceholderTextArea.getText();
 109   }
 110
 111   public List<String> getHints() {
 112     final String hintText = myHintTextArea.getText();
 113     if (myShownHintNumber == 0 && hintText.equals(HINT_PLACEHOLDER)) {
 114       myHints.set(myShownHintNumber, "");
 115     }
 116     else {
 117       myHints.set(myShownHintNumber, hintText);
 118     }
 119
 120     return myHints;
 121   }
 122
 123   public JComponent getPreferredFocusedComponent() {
 124     return myPlaceholderTextArea;
 125   }
 126
 127   public JPanel getMailPanel() {
 128     return myPanel;
 129   }
 130
 131   private class ShowNext extends AnAction {
 132
 133     public ShowNext() {
 134       super(NEXT_HINT, NEXT_HINT, AllIcons.Actions.Forward);
 135     }
 136
 137     @Override
 138     public void actionPerformed(AnActionEvent e) {
 139       myHints.set(myShownHintNumber, myHintTextArea.getText());
 140       showHint(myHints.get(++myShownHintNumber));
 141     }
 142
 143     @Override
 144     public void update(AnActionEvent e) {
 145       e.getPresentation().setEnabled(myShownHintNumber + 1 < myHints.size());
 146     }
 147   }
 148
 149   private class ShowPrevious extends AnAction {
 150
 151     public ShowPrevious() {
 152       super(PREVIOUS_HINT, PREVIOUS_HINT, AllIcons.Actions.Back);
 153     }
 154
 155     @Override
 156     public void actionPerformed(AnActionEvent e) {
 157       myHints.set(myShownHintNumber, myHintTextArea.getText());
 158       showHint(myHints.get(--myShownHintNumber));
 159     }
 160
 161     @Override
 162     public void update(AnActionEvent e) {
 163       e.getPresentation().setEnabled(myShownHintNumber - 1 >= 0);
 164     }
 165   }
 166
 167   private class AddHint extends AnAction {
 168
 169     public AddHint() {
 170       super(ADD_HINT, ADD_HINT, AllIcons.General.Add);
 171     }
 172
 173     @Override
 174     public void actionPerformed(AnActionEvent e) {
 175       myHints.add("");
 176       myShownHintNumber++;
 177       showHint("");
 178     }
 179   }
 180
 181   private class RemoveHint extends AnAction {
 182
 183     public RemoveHint() {
 184       super(REMOVE_HINT, REMOVE_HINT, AllIcons.General.Remove);
 185     }
 186
 187     @Override
 188     public void actionPerformed(AnActionEvent e) {
 189       myHints.remove(myShownHintNumber);
 190       myShownHintNumber += myShownHintNumber < myHints.size() ? 0 : -1;
 191       showHint(myHints.get(myShownHintNumber));
 192     }
 193
 194     @Override
 195     public void update(AnActionEvent e) {
 196       e.getPresentation().setEnabled(myHints.size() > 1);
 197     }
 198   }
 199 }