On Mon, 29 Mar 2021 19:57:17 GMT, mstr2 <github.com+43553916+ms...@openjdk.org> wrote:
> The children of HBox/VBox don't always pixel-snap to the same value as the > container itself when a render scale other than 1 is used. This can lead to a > visual glitch where the content bounds don't line up with the container > bounds. In this case, the container will extend beyond its content, or vice > versa. > > The following program shows the problem for HBox: > Region r1 = new Region(); > Region r2 = new Region(); > Region r3 = new Region(); > Region r4 = new Region(); > Region r5 = new Region(); > Region r6 = new Region(); > r1.setBackground(new Background(new BackgroundFill(Color.GREY, null, null))); > r2.setBackground(new Background(new BackgroundFill(Color.DARKGRAY, null, > null))); > r3.setBackground(new Background(new BackgroundFill(Color.BLACK, null, null))); > r4.setBackground(new Background(new BackgroundFill(Color.GREY, null, null))); > r5.setBackground(new Background(new BackgroundFill(Color.DARKGRAY, null, > null))); > r6.setBackground(new Background(new BackgroundFill(Color.BLACK, null, null))); > r1.setPrefWidth(25.3); > r2.setPrefWidth(25.3); > r3.setPrefWidth(25.4); > r4.setPrefWidth(25.3); > r5.setPrefWidth(25.3); > r6.setPrefWidth(25.4); > r1.setMaxHeight(30); > r2.setMaxHeight(30); > r3.setMaxHeight(30); > r4.setMaxHeight(30); > r5.setMaxHeight(30); > r6.setMaxHeight(30); > HBox hbox1 = new HBox(r1, r2, r3, r4, r5, r6); > hbox1.setBackground(new Background(new BackgroundFill(Color.RED, null, > null))); > hbox1.setPrefHeight(40); > > r1 = new Region(); > r2 = new Region(); > r3 = new Region(); > r4 = new Region(); > r5 = new Region(); > r6 = new Region(); > r1.setBackground(new Background(new BackgroundFill(Color.GREY, null, null))); > r2.setBackground(new Background(new BackgroundFill(Color.DARKGRAY, null, > null))); > r3.setBackground(new Background(new BackgroundFill(Color.BLACK, null, null))); > r4.setBackground(new Background(new BackgroundFill(Color.GREY, null, null))); > r5.setBackground(new Background(new BackgroundFill(Color.DARKGRAY, null, > null))); > r6.setBackground(new Background(new BackgroundFill(Color.BLACK, null, null))); > r1.setPrefWidth(25.3); > r2.setPrefWidth(25.3); > r3.setPrefWidth(25.4); > r4.setPrefWidth(25.3); > r5.setPrefWidth(25.3); > r6.setPrefWidth(25.4); > r1.setMaxHeight(30); > r2.setMaxHeight(30); > r3.setMaxHeight(30); > r4.setMaxHeight(30); > r5.setMaxHeight(30); > r6.setMaxHeight(30); > HBox hbox2 = new HBox(r1, r2, r3, r4, r5, r6); > hbox2.setBackground(new Background(new BackgroundFill(Color.RED, null, > null))); > hbox2.setPrefHeight(40); > hbox2.setPrefWidth(152); > > VBox root = new VBox(new HBox(hbox1), new HBox(hbox2)); > root.setSpacing(20); > Scene scene = new Scene(root, 500, 250); > > primaryStage.setScene(scene); > primaryStage.show(); > > Here's a before-and-after comparison of the program above after applying the > fix. Note that 'before', the backgrounds of the container (red) and its > content (black) don't align perfectly. The render scale is 175% in this > example. >  > > I've filed a bug report and will change the title of the GitHub issue as soon > as it's posted. The bug is posted here: [JDK-8264591](https://bugs.openjdk.java.net/browse/JDK-8264591): HBox/VBox child widths pixel-snap to wrong value ------------- PR: https://git.openjdk.java.net/jfx/pull/445
