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/*
* Copyright 2000-2009 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.intellij.ui;
import com.intellij.icons.AllIcons;
import com.intellij.openapi.Disposable;
import com.intellij.openapi.actionSystem.AnActionEvent;
import com.intellij.openapi.actionSystem.ToggleAction;
import com.intellij.openapi.application.ModalityState;
import com.intellij.openapi.fileEditor.FileEditor;
import com.intellij.openapi.fileEditor.FileEditorManagerAdapter;
import com.intellij.openapi.fileEditor.FileEditorManagerEvent;
import com.intellij.openapi.fileEditor.FileEditorManagerListener;
import com.intellij.openapi.project.DumbAware;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.util.Disposer;
import com.intellij.util.Alarm;
import com.intellij.util.messages.MessageBusConnection;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import javax.swing.*;
/**
* @author Konstantin Bulenkov
*/
@SuppressWarnings("MethodMayBeStatic")
public abstract class AutoScrollFromSourceHandler implements Disposable {
protected final Project myProject;
protected final Alarm myAlarm;
private JComponent myComponent;
public AutoScrollFromSourceHandler(@NotNull Project project, @NotNull JComponent view) {
this(project, view, null);
}
public AutoScrollFromSourceHandler(@NotNull Project project, @NotNull JComponent view, @Nullable Disposable parentDisposable) {
myProject = project;
if (parentDisposable != null) {
Disposer.register(parentDisposable, this);
}
myComponent = view;
myAlarm = new Alarm(this);
}
protected abstract boolean isAutoScrollEnabled();
protected abstract void setAutoScrollEnabled(boolean enabled);
protected abstract void selectElementFromEditor(@NotNull FileEditor editor);
protected ModalityState getModalityState() {
return ModalityState.current();
}
protected long getAlarmDelay() {
return 500;
}
public void install() {
final MessageBusConnection connection = myProject.getMessageBus().connect(myProject);
connection.subscribe(FileEditorManagerListener.FILE_EDITOR_MANAGER, new FileEditorManagerAdapter() {
@Override
public void selectionChanged(@NotNull FileEditorManagerEvent event) {
final FileEditor editor = event.getNewEditor();
if (editor != null && myComponent.isShowing() && isAutoScrollEnabled()) {
myAlarm.cancelAllRequests();
myAlarm.addRequest(new Runnable() {
@Override
public void run() {
selectElementFromEditor(editor);
}
}, getAlarmDelay(), getModalityState());
}
}
});
}
@Override
public void dispose() {
if (!myAlarm.isDisposed()) {
myAlarm.cancelAllRequests();
}
}
public ToggleAction createToggleAction() {
return new AutoScrollFromSourceAction();
}
private class AutoScrollFromSourceAction extends ToggleAction implements DumbAware {
public AutoScrollFromSourceAction() {
super(UIBundle.message("autoscroll.from.source.action.name"),
UIBundle.message("autoscroll.from.source.action.description"),
AllIcons.General.AutoscrollFromSource);
}
public boolean isSelected(final AnActionEvent event) {
return isAutoScrollEnabled();
}
public void setSelected(final AnActionEvent event, final boolean flag) {
setAutoScrollEnabled(flag);
}
}
}
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