JViewport fix for painted background

BobHanson · BobHanson · commit e308400b358d · 2017-12-19T08:18:56.000-06:00
diff --git a/sources/net.sf.j2s.java.core/src/java/awt/GraphicsCallback.java b/sources/net.sf.j2s.java.core/src/java/awt/GraphicsCallback.java
@@ -121,6 +121,7 @@ private PaintHeavyweightComponentsCallback() {}
         @Override
 				public void run(Component comp, Graphics cg) {
         	if (comp.isLightweight()) {
+        		// never true in SwingJS
 //            if (comp.peer instanceof LightweightPeer) {
                 comp.paintHeavyweightComponents(cg);
             } else {
diff --git a/sources/net.sf.j2s.java.core/src/javax/swing/JViewport.java b/sources/net.sf.j2s.java.core/src/javax/swing/JViewport.java
@@ -1153,6 +1153,11 @@ public Rectangle getViewRect() {
      * @param blitPaint the area to blit
      * @return  true if the parameters are modified and we're ready to blit;
      *          false otherwise
+     *          
+     * SwingJS cannot blit, as there is only one canvas for the entire JFrame or JApplet. 
+     *          
+     * @j2sNative
+     * return  false;         
      */
     protected boolean computeBlit(
         int dx,
@@ -1162,6 +1167,7 @@ protected boolean computeBlit(
         Dimension blitSize,
         Rectangle blitPaint)
     {
+    
         int dxAbs = Math.abs(dx);
         int dyAbs = Math.abs(dy);
         Dimension extentSize = getExtentSize();
diff --git a/sources/net.sf.j2s.java.core/src/swingjs/plaf/JSSliderUI.java b/sources/net.sf.j2s.java.core/src/swingjs/plaf/JSSliderUI.java
@@ -27,6 +27,9 @@ public class JSSliderUI extends JSLightweightUI implements PropertyChangeListene
 
 	static {
 		Object jqueryui = JQueryUI.class; // loads jQuery.ui
+		// this static call allows for the CSS to be loaded only once and only when needed
+		JSUtil.loadStaticResource("swingjs/jquery/jquery-ui-j2sslider.css");
+		JSUtil.loadStaticResource("swingjs/jquery/jquery-ui-j2sslider.js");
 	}
 
 	JSlider jSlider;
@@ -55,16 +58,7 @@ public class JSSliderUI extends JSLightweightUI implements PropertyChangeListene
 	private boolean isVerticalScrollBar;
 	private boolean isInverted;
 	
-	private static boolean cssLoaded = false;
-
-	public JSSliderUI() {
-		
-		if (!cssLoaded) {
-			// this static call allows for the CSS to be loaded only once and only when needed
-			JSUtil.loadStaticResource("swingjs/jquery/jquery-ui-j2sslider.css");
-			JSUtil.loadStaticResource("swingjs/jquery/jquery-ui-j2sslider.js");
-			cssLoaded = true;
-		}
+	public JSSliderUI() {		
 		needPreferred = true;
 		setDoc();
 	}
