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/*
* Copyright 2000-2014 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.util.ui;
import com.intellij.openapi.util.SystemInfo;
import com.intellij.ui.mac.foundation.Foundation;
import com.intellij.ui.mac.foundation.ID;
import com.sun.jna.Callback;
import com.sun.jna.Pointer;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import javax.swing.event.EventListenerList;
import java.util.EventListener;
import static com.intellij.ui.mac.foundation.Foundation.invoke;
class NSScrollerHelper {
private static final Callback APPEARANCE_CALLBACK = new Callback() {
@SuppressWarnings("UnusedDeclaration")
public void callback(ID self, Pointer selector, ID event) {
UIUtil.invokeLaterIfNeeded(new Runnable() {
@Override
public void run() {
fireStyleChanged();
}
});
}
};
private static final Callback BEHAVIOR_CALLBACK = new Callback() {
@SuppressWarnings("UnusedDeclaration")
public void callback(ID self, Pointer selector, ID event) {
UIUtil.invokeLaterIfNeeded(new Runnable() {
@Override
public void run() {
updateBehaviorPreferences();
}
});
}
};
public enum ClickBehavior {NextPage, JumpToSpot}
public enum Style {Legacy, Overlay}
private static ClickBehavior ourClickBehavior = null;
private static final EventListenerList ourStyleListeners = new EventListenerList();
static {
if (SystemInfo.isMac) {
initNotificationObserver();
updateBehaviorPreferences();
}
}
private static boolean isOverlayScrollbarSupported() {
return SystemInfo.isMac && SystemInfo.isMacOSMountainLion;
}
private static void initNotificationObserver() {
Foundation.NSAutoreleasePool pool = new Foundation.NSAutoreleasePool();
ID delegateClass = Foundation.allocateObjcClassPair(Foundation.getObjcClass("NSObject"), "NSScrollerChangesObserver");
if (!ID.NIL.equals(delegateClass)) {
if (!Foundation.addMethod(delegateClass, Foundation.createSelector("handleScrollerStyleChanged:"), APPEARANCE_CALLBACK, "v@")) {
throw new RuntimeException("Cannot add observer method");
}
if (!Foundation.addMethod(delegateClass, Foundation.createSelector("handleBehaviorChanged:"), BEHAVIOR_CALLBACK, "v@")) {
throw new RuntimeException("Cannot add observer method");
}
Foundation.registerObjcClassPair(delegateClass);
}
ID delegate = invoke("NSScrollerChangesObserver", "new");
try {
ID center;
center = invoke("NSNotificationCenter", "defaultCenter");
invoke(center, "addObserver:selector:name:object:",
delegate,
Foundation.createSelector("handleScrollerStyleChanged:"),
Foundation.nsString("NSPreferredScrollerStyleDidChangeNotification"),
ID.NIL
);
center = invoke("NSDistributedNotificationCenter", "defaultCenter");
invoke(center, "addObserver:selector:name:object:",
delegate,
Foundation.createSelector("handleBehaviorChanged:"),
Foundation.nsString("AppleNoRedisplayAppearancePreferenceChanged"),
ID.NIL,
2 // NSNotificationSuspensionBehaviorCoalesce
);
}
finally {
pool.drain();
}
}
@Nullable
public static ClickBehavior getClickBehavior() {
if (!SystemInfo.isMac) return null;
return ourClickBehavior;
}
private static void updateBehaviorPreferences() {
if (!SystemInfo.isMac) return;
Foundation.NSAutoreleasePool pool = new Foundation.NSAutoreleasePool();
try {
ID defaults = invoke("NSUserDefaults", "standardUserDefaults");
invoke(defaults, "synchronize");
ourClickBehavior = invoke(defaults, "boolForKey:", Foundation.nsString("AppleScrollerPagingBehavior")).intValue() == 1
? ClickBehavior.JumpToSpot : ClickBehavior.NextPage;
}
finally {
pool.drain();
}
}
@Nullable
public static Style getScrollerStyle() {
if (!isOverlayScrollbarSupported()) return null;
Foundation.NSAutoreleasePool pool = new Foundation.NSAutoreleasePool();
try {
if (Foundation.invoke(Foundation.getObjcClass("NSScroller"), "preferredScrollerStyle").intValue() == 1) {
return Style.Overlay;
}
}
catch (Throwable ignore) {
}
finally {
pool.drain();
}
return Style.Legacy;
}
public static void addScrollbarStyleListener(@NotNull ScrollbarStyleListener listener) {
ourStyleListeners.add(ScrollbarStyleListener.class, listener);
}
public static void removeScrollbarStyleListener(@NotNull ScrollbarStyleListener listener) {
ourStyleListeners.remove(ScrollbarStyleListener.class, listener);
}
private static void fireStyleChanged() {
Object[] listeners = ourStyleListeners.getListenerList();
for (int i = listeners.length - 2; i >= 0; i -= 2) {
if (listeners[i] == ScrollbarStyleListener.class) {
((ScrollbarStyleListener)listeners[i + 1]).styleChanged();
}
}
}
public interface ScrollbarStyleListener extends EventListener {
void styleChanged();
}
}
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