FixAltTab.patch

From 4c9aca61ee963c8352e49da176216fdd89bc5b40 Mon Sep 17 00:00:00 2001
From: Riccardo Balbo <riccardo@forkforge.net>
Date: Fri, 14 Jun 2019 23:43:21 +0200
Subject: [PATCH] Fix alt tab

---
 .../com/jme3/input/lwjgl/JInputJoyInput.java  | 10 +++
 .../com/jme3/input/lwjgl/LwjglKeyInput.java   | 11 ++++
 .../com/jme3/input/lwjgl/LwjglMouseInput.java | 10 +++
 .../java/com/jme3/system/NullRenderer.java    |  5 ++
 .../system/lwjgl/LwjglAbstractDisplay.java    | 11 ++++
 .../com/jme3/system/lwjgl/LwjglDisplay.java   | 63 +++++++++++++++++++
 6 files changed, 110 insertions(+)

diff --git a/commons/src/main/java/com/jme3/input/lwjgl/JInputJoyInput.java b/commons/src/main/java/com/jme3/input/lwjgl/JInputJoyInput.java
index d89a07a..13cc36b 100644
--- a/commons/src/main/java/com/jme3/input/lwjgl/JInputJoyInput.java
+++ b/commons/src/main/java/com/jme3/input/lwjgl/JInputJoyInput.java
@@ -117,7 +117,17 @@ public class JInputJoyInput implements JoyInput {
         inited = true;
     }
 
+    private boolean enabled=true;
+    public void setEnabled(boolean v){
+        enabled=v;
+    }
+
+    public boolean isEnabled(){
+        return enabled;
+    }
+
     public void update() {
+        if(!enabled) return;
         ControllerEnvironment ce =
             ControllerEnvironment.getDefaultEnvironment();
 
diff --git a/commons/src/main/java/com/jme3/input/lwjgl/LwjglKeyInput.java b/commons/src/main/java/com/jme3/input/lwjgl/LwjglKeyInput.java
index e7b9f92..ca26d8a 100644
--- a/commons/src/main/java/com/jme3/input/lwjgl/LwjglKeyInput.java
+++ b/commons/src/main/java/com/jme3/input/lwjgl/LwjglKeyInput.java
@@ -72,7 +72,18 @@ public class LwjglKeyInput implements KeyInput {
         return Keyboard.KEYBOARD_SIZE;
     }
 
+    private boolean enabled=true;
+    public void setEnabled(boolean v){
+        enabled=v;
+    }
+
+    public boolean isEnabled(){
+        return enabled;
+    }
+
     public void update() {
+        if(!enabled) return;
+        
         if (!context.isRenderable())
             return;
         
diff --git a/commons/src/main/java/com/jme3/input/lwjgl/LwjglMouseInput.java b/commons/src/main/java/com/jme3/input/lwjgl/LwjglMouseInput.java
index b53d936..2185220 100644
--- a/commons/src/main/java/com/jme3/input/lwjgl/LwjglMouseInput.java
+++ b/commons/src/main/java/com/jme3/input/lwjgl/LwjglMouseInput.java
@@ -99,7 +99,17 @@ public class LwjglMouseInput implements MouseInput {
         return Mouse.getButtonCount();
     }
 
+    private boolean enabled=true;
+    public void setEnabled(boolean v){
+        enabled=v;
+    }
+
+    public boolean isEnabled(){
+        return enabled;
+    }
+
     public void update() {
+        if(!enabled) return;
         if (!context.isRenderable())
             return;
 
diff --git a/commons/src/main/java/com/jme3/system/NullRenderer.java b/commons/src/main/java/com/jme3/system/NullRenderer.java
index 4c67c61..416ff40 100644
--- a/commons/src/main/java/com/jme3/system/NullRenderer.java
+++ b/commons/src/main/java/com/jme3/system/NullRenderer.java
@@ -279,4 +279,9 @@ public class NullRenderer implements Renderer {
     public void endConditionalRendering() {
 
     }
+
+    @Override
+    public ColorRGBA getBackgroundColor() {
+        return null;
+    }
 }
diff --git a/commons/src/main/java/com/jme3/system/lwjgl/LwjglAbstractDisplay.java b/commons/src/main/java/com/jme3/system/lwjgl/LwjglAbstractDisplay.java
index f241fc3..eb62692 100644
--- a/commons/src/main/java/com/jme3/system/lwjgl/LwjglAbstractDisplay.java
+++ b/commons/src/main/java/com/jme3/system/lwjgl/LwjglAbstractDisplay.java
@@ -224,9 +224,11 @@ public abstract class LwjglAbstractDisplay extends LwjglContext implements Runna
                         listener.gainFocus();
                         timer.reset();
                         wasActive = true;
+                        onFocusGained();
                     } else {
                         listener.loseFocus();
                         wasActive = false;
+                        onFocusLost();
                     }
                 }
             }
@@ -239,6 +241,15 @@ public abstract class LwjglAbstractDisplay extends LwjglContext implements Runna
         deinitInThread();
     }
 
+
+    protected void onFocusGained(){
+
+    }
+
+    protected void onFocusLost(){
+
+    }
+
     public JoyInput getJoyInput() {
         if (joyInput == null){
             joyInput = new JInputJoyInput();
diff --git a/commons/src/main/java/com/jme3/system/lwjgl/LwjglDisplay.java b/commons/src/main/java/com/jme3/system/lwjgl/LwjglDisplay.java
index 459c56a..9ca0166 100644
--- a/commons/src/main/java/com/jme3/system/lwjgl/LwjglDisplay.java
+++ b/commons/src/main/java/com/jme3/system/lwjgl/LwjglDisplay.java
@@ -32,6 +32,7 @@
 
 package com.jme3.system.lwjgl;
 
+import com.jme3.EngineHacks;
 import com.jme3.system.AppSettings;
 import com.jme3.system.JmeContext.Type;
 import java.awt.Graphics2D;
@@ -41,6 +42,7 @@ import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 import org.lwjgl.LWJGLException;
+import org.lwjgl.input.Mouse;
 import org.lwjgl.opengl.*;
 
 public class LwjglDisplay extends LwjglAbstractDisplay {
@@ -261,4 +263,65 @@ public class LwjglDisplay extends LwjglAbstractDisplay {
         return ByteBuffer.wrap(imageBuffer);
     }
 
+    private boolean skipNextGrab=false;
+    private boolean skipNextLoss=false;
+    private boolean wasMouseGrabbed;
+
+    protected void onFocusGained() {
+        if(!EngineHacks.windowedOnAltTab)return;
+        if(settings.isFullscreen() && Display.isVisible()  ){
+            if(skipNextGrab){
+                skipNextGrab=false;
+                return;
+            }
+            try{
+                if(!Display.isFullscreen()){
+                    Display.setFullscreen(true);
+                    skipNextLoss=true;
+                }                
+                if(keyInput != null) keyInput.setEnabled(true);
+                if(joyInput != null) joyInput.setEnabled(true);
+                if(mouseInput != null){
+                    mouseInput.setEnabled(true);
+                    Mouse.setGrabbed(wasMouseGrabbed);
+                    Mouse.setClipMouseCoordinatesToWindow(true);
+                    Mouse.setGrabbed(true);
+                }
+
+                Display.update();
+
+            }catch(LWJGLException e){
+                e.printStackTrace();
+            }
+        }
+    }
+
+
+    protected void onFocusLost() {    
+        if(!EngineHacks.windowedOnAltTab)return;
+   
+        if(settings.isFullscreen()){
+                if(skipNextLoss){
+                    skipNextLoss=false;
+                    return;
+                }
+                try{
+                    if(Display.isFullscreen()){
+                        Display.setFullscreen(false);
+                        skipNextGrab=true;
+                    }
+                    if(keyInput!=null) keyInput.setEnabled(false);                    
+                    if(joyInput!=null) joyInput.setEnabled(false);                                        
+                    if(mouseInput!=null){
+                        mouseInput.setEnabled(false);
+                        wasMouseGrabbed=Mouse.isGrabbed();
+                        Mouse.setGrabbed(false);
+                        Mouse.setClipMouseCoordinatesToWindow(false);
+                    }       
+                }catch(LWJGLException e){
+                    e.printStackTrace();
+                }
+        }
+    }
+
 }
-- 
2.17.1