Implement Back and Menu key support

forge-gui-mobile/src/forge/Forge.java

@@ -96,6 +96,8 @@ public class Forge implements ApplicationListener {
         FSkin.loadFull(splashScreen);
 
         Gdx.input.setInputProcessor(new MainInputProcessor());
+        Gdx.input.setCatchBackKey(true);
+        Gdx.input.setCatchMenuKey(true);
         openScreen(new HomeScreen());
         splashScreen = null;
     }
@@ -106,6 +108,7 @@ public class Forge implements ApplicationListener {
 
     public static void showMenu() {
         if (currentScreen == null) { return; }
+        endKeyInput(); //end key input before menu shown
         currentScreen.showMenu();
     }
 
@@ -233,13 +236,14 @@ public class Forge implements ApplicationListener {
         Gdx.input.setOnscreenKeyboardVisible(true);
     }
 
-    public static void endKeyInput() {
+    public static boolean endKeyInput() {
-        if (keyInputAdapter == null) { return; }
+        if (keyInputAdapter == null) { return false; }
         keyInputAdapter.onInputEnd();
         keyInputAdapter = null;
         MainInputProcessor.keyTyped = false;
         MainInputProcessor.lastKeyTyped = '\0';
         Gdx.input.setOnscreenKeyboardVisible(false);
+        return true;
     }
 
     public static abstract class KeyInputAdapter {
@@ -270,6 +274,10 @@ public class Forge implements ApplicationListener {
 
         @Override
         public boolean keyDown(int keyCode) {
+            if (keyCode == Keys.MENU) {
+                showMenu();
+                return true;
+            }
             if (keyInputAdapter == null) {
                 //if no active key input adapter, give current screen or overlay a chance to handle key
                 FContainer container = FOverlay.getTopOverlay();

forge-gui-mobile/src/forge/screens/FScreen.java

@@ -150,7 +150,9 @@ public abstract class FScreen extends FContainer {
 
     @Override
     public boolean keyDown(int keyCode) {
-        if (keyCode == Keys.ESCAPE) {
+        if (keyCode == Keys.ESCAPE || keyCode == Keys.BACK) {
+            if (Forge.endKeyInput()) { return true; }
+
             Forge.back(); //go back on escape by default
             return true;
         }

forge-gui-mobile/src/forge/screens/match/MatchScreen.java

@@ -181,6 +181,9 @@ public class MatchScreen extends FScreen {
             return prompt.getBtnCancel().trigger(); //trigger Cancel if can't trigger OK
         case Keys.ESCAPE:
             return prompt.getBtnCancel().trigger(); //otherwise trigger Cancel
+        case Keys.BACK:
+            FControl.undoLastAction(); //let back trigger undo instead of going back a screen
+            return true;
         case Keys.A: //alpha strike on Ctrl+A
             if (KeyInputAdapter.isCtrlKeyDown()) {
                 FControl.alphaStrike();

forge-gui-mobile/src/forge/toolbox/FOptionPane.java

@@ -270,8 +270,11 @@ public class FOptionPane extends FDialog {
             }
             return true;
         case Keys.ESCAPE:
+        case Keys.BACK:
+            if (Forge.endKeyInput()) { return true; }
+
             if (isButtonEnabled(buttons.length - 1)) {
-                setResult(buttons.length - 1); //set result to final option on Escape
+                setResult(buttons.length - 1); //set result to final option on Escape or Back
             }
             return true;
         }

forge-gui-mobile/src/forge/toolbox/FOverlay.java

@@ -5,6 +5,7 @@ import java.util.Stack;
 import com.badlogic.gdx.Input.Keys;
 import com.badlogic.gdx.math.Vector2;
 
+import forge.Forge;
 import forge.Forge.Graphics;
 import forge.assets.FSkinColor;
 import forge.assets.FSkinColor.Colors;
@@ -108,7 +109,9 @@ public abstract class FOverlay extends FContainer {
 
     @Override
     public boolean keyDown(int keyCode) {
-        if (keyCode == Keys.ESCAPE) {
+        if (keyCode == Keys.ESCAPE || keyCode == Keys.BACK) {
+            if (Forge.endKeyInput()) { return true; }
+
             hide(); //hide on escape by default
             return true;
         }