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TypeInfoAction.java
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TypeInfoAction.java
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package com.haskforce.actions;
import com.haskforce.highlighting.annotation.external.TypeInfoUtil;
import com.haskforce.psi.HaskellFile;
import com.intellij.codeInsight.hint.HintManager;
import com.intellij.codeInsight.hint.HintManagerImpl;
import com.intellij.codeInsight.hint.HintUtil;
import com.intellij.openapi.actionSystem.AnAction;
import com.intellij.openapi.actionSystem.AnActionEvent;
import com.intellij.openapi.actionSystem.CommonDataKeys;
import com.intellij.openapi.editor.Editor;
import com.intellij.openapi.editor.LogicalPosition;
import com.intellij.openapi.fileEditor.FileEditorManager;
import com.intellij.openapi.project.Project;
import com.intellij.psi.PsiFile;
import com.intellij.ui.LightweightHint;
import com.intellij.util.ui.UIUtil;
import org.jetbrains.annotations.NotNull;
import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
/**
* This action will show the type information on the position of the cursor or the selection.
* It will create a normal pop up in the neighbourhood of the cursor or selection position
* containing the types found
*/
public class TypeInfoAction extends AnAction {
/**
* Only enable type info when in a Haskell file.
*/
@Override
public void update(AnActionEvent e) {
final PsiFile file = e.getData(CommonDataKeys.PSI_FILE);
e.getPresentation().setEnabled(file != null && file instanceof HaskellFile);
}
public void actionPerformed(@NotNull AnActionEvent e) {
Project project = e.getProject();
if (project == null){
return;
}
FileEditorManager fileEditorManager = FileEditorManager.getInstance(project);
String typeInfo = TypeInfoUtil.getTypeInfo(project);
if (typeInfo == null) {
// TODO: getTypeInfo should probably be @NotNull
return;
}
JComponent label = HintUtil.createInformationLabel(typeInfo);
label.setFont(UIUtil.getLabelFont());
final LightweightHint hint = new LightweightHint(label);
final HintManagerImpl manager = HintManagerImpl.getInstanceImpl();
label.addMouseMotionListener(new MouseMotionAdapter() {
@Override
public void mouseMoved(MouseEvent e) {
manager.hideAllHints();
}
});
Editor editor = fileEditorManager.getSelectedTextEditor();
// TODO: Refactor this, editor shouldn't be null since it's checked in getTypeInfo
assert editor != null;
LogicalPosition position = editor.getCaretModel().getLogicalPosition();
Point point = HintManagerImpl.getHintPosition(hint, editor, position, HintManager.ABOVE);
int flags = HintManager.HIDE_BY_ANY_KEY |
HintManager.HIDE_BY_TEXT_CHANGE |
HintManager.HIDE_BY_SCROLLING;
manager.showEditorHint(hint, editor, point, flags, 0, false);
}
}