X-Git-Url: http://git.nikiroo.be/?a=blobdiff_plain;f=src%2Fjexer%2FTWidget.java;h=60bc3e4a618c0cce09d84cbdbedfdc200da39906;hb=9ad2ce4f566e1d811ac0fd205efe8865a77ae1de;hp=5d2612b3092e961d82ad8b6beea94ce93a20d15d;hpb=90d87fca1ee987e6650b90beafc7831cbca0a457;p=fanfix.git

diff --git a/src/jexer/TWidget.java b/src/jexer/TWidget.java
index 5d2612b..60bc3e4 100644
--- a/src/jexer/TWidget.java
+++ b/src/jexer/TWidget.java
@@ -1243,6 +1243,25 @@ public abstract class TWidget implements Comparable<TWidget> {
         return window.getApplication().getTheme();
     }
 
+    /**
+     * See if this widget can be drawn onto a screen.
+     *
+     * @return true if this widget is part of the hierarchy that can draw to
+     * a screen
+     */
+    public final boolean isDrawable() {
+        if ((window == null)
+            || (window.getScreen() == null)
+            || (parent == null)
+        ) {
+            return false;
+        }
+        if (parent == this) {
+            return true;
+        }
+        return (parent.isDrawable());
+    }
+
     /**
      * Draw my specific widget.  When called, the screen rectangle I draw
      * into is already setup (offset and clipping).
@@ -1255,7 +1274,7 @@ public abstract class TWidget implements Comparable<TWidget> {
      * Called by parent to render to TWindow.  Note package private access.
      */
     final void drawChildren() {
-        if (window == null) {
+        if (!isDrawable()) {
             return;
         }
 
@@ -1310,6 +1329,12 @@ public abstract class TWidget implements Comparable<TWidget> {
 
         // Draw me
         draw();
+        if (!isDrawable()) {
+            // An action taken by a draw method unhooked me from the UI.
+            // Bail out.
+            return;
+        }
+
         assert (visible == true);
 
         // Continue down the chain.  Draw the active child last so that it
@@ -1317,6 +1342,11 @@ public abstract class TWidget implements Comparable<TWidget> {
         for (TWidget widget: children) {
             if (widget.isVisible() && (widget != activeChild)) {
                 widget.drawChildren();
+                if (!isDrawable()) {
+                    // An action taken by a draw method unhooked me from the UI.
+                    // Bail out.
+                    return;
+                }
             }
         }
         if (activeChild != null) {
@@ -1445,6 +1475,19 @@ public abstract class TWidget implements Comparable<TWidget> {
         }
     }
 
+    /**
+     * Make this widget, all of its parents, the active child.
+     */
+    public final void activateAll() {
+        activate();
+        if (parent == this) {
+            return;
+        }
+        if (parent != null) {
+            parent.activateAll();
+        }
+    }
+
     /**
      * Switch the active widget with the next in the tab order.
      *
@@ -1575,11 +1618,10 @@ public abstract class TWidget implements Comparable<TWidget> {
             splitPane.setLeft(this);
             splitPane.setRight(newWidget);
         }
-        splitPane.activate();
         if (newWidget != null) {
-            newWidget.activate();
+            newWidget.activateAll();
         } else {
-            activate();
+            activateAll();
         }
 
         assert (parent != null);
@@ -1627,11 +1669,10 @@ public abstract class TWidget implements Comparable<TWidget> {
             splitPane.setTop(this);
             splitPane.setBottom(newWidget);
         }
-        splitPane.activate();
         if (newWidget != null) {
-            newWidget.activate();
+            newWidget.activateAll();
         } else {
-            activate();
+            activateAll();
         }
 
         assert (parent != null);