JavaFX2.0 分割线Separator.doc

JavaFX API中的Separator类呈现的是一条水平或者垂直的分隔线。它是用来分隔应用中用户接口的元素的，并不提供任何行为。不过，它也可以被美化，应用视效，甚至是动画。默认分隔线是水平的，可以使用setOrientation方法改变它的方向。创建SeparatorExample 14-1中的代码块创建了一条水平的一条垂直的分隔线。Example 14-1 Vertical and Horizontal Separators/Horizontal separator Separator separator1 = new Separator(); /Vertical separator Separator separator2 = new Separator(); separator2.setOrientation(Orientation.VERTICAL);Separator类继承了Node类，所以，分隔线就继承了Node类的所有常量和变量。一般分隔线是用来分隔UI控件成组的。研究下Example 14-2中的代码，它将春天的月份和夏天的分开了Example 14-2 Using a Separator Between Checkbox Categoriesfinal String names = new StringMarch, April, May, June, July, August; final CheckBox cbs = new CheckBoxnames.length; final Separator separator = new Separator(); final VBox vbox = new VBox(); for (int i = 0; i names.length; i+) cbsi = new CheckBox(namesi); separator.setMaxWidth(40); separator.setAlignment(Pos.CENTER_LEFT); vbox.getChildren().addAll(cbs); vbox.setSpacing(5); vbox.getChildren().add(3, separator);运行效果见Figure 14-1.Figure 14-1 Checkboxes and a SeparatorDescription of Figure 14-1 Checkboxes and a Separator分隔线会占据分配给它的全部水平或垂直空间。setMaxWidth方法用来指定一个特定的宽度，setValignment方法指定了分隔线在其分配的布局空间内的垂直位置。类似地，也可以使用setHalignment方法来设置其水平位置。在Example 14-2中，分隔线被使用专用的方法add(index, node)加入了垂直盒子。可以使用这种方法在创建UI后或者动态改变UI时包括分隔线。为UI添加分隔线前面提到，分隔线可以将UI控件分组。可以使用它们构建用户接口，就像下面这样显示天气预报Figure 14-2.Figure 14-2 Structuring Weather Forecast Data with SeparatorsDescription of Figure 14-2 Structuring Weather Forecast Data with SeparatorsFigure 14-2中的效果是，分隔线用来分开Label和ImageView对象。研究下下面的代码Example 14-3.Example 14-3 Using Separators in a Weather Forecast Applicationimport javafx.application.Application; import javafx.geometry.Insets; import javafx.geometry.Orientation; import javafx.geometry.VPos; import javafx.scene.Group; import javafx.scene.Scene; import javafx.scene.control.*; import javafx.scene.image.Image; import javafx.scene.image.ImageView; import javafx.scene.layout.GridPane; import javafx.scene.text.Font; import javafx.stage.Stage; public class Main extends Application Label caption = new Label(Weather Forecast); Label friday = new Label(Friday); Label saturday = new Label(Saturday); Label sunday = new Label(Sunday); Override public void start(Stage stage) Group root = new Group(); Scene scene = new Scene(root, 500, 300); stage.setScene(scene); stage.setTitle(Separator Sample); GridPane grid = new GridPane(); grid.setPadding(new Insets(10, 10, 10, 10); grid.setVgap(2); grid.setHgap(5); scene.setRoot(grid); Image cloudImage = new Image(getClass().getResourceAsStream(cloud.jpg); Image sunImage = new Image(getClass().getResourceAsStream(sun.jpg); caption.setFont(Font.font(Verdana, 20); GridPane.setConstraints(caption, 0, 0); GridPane.setColumnSpan(caption, 8); grid.getChildren().add(caption); final Separator sepHor = new Separator(); sepHor.setValignment(VPos.CENTER); GridPane.setConstraints(sepHor, 0, 1); GridPane.setColumnSpan(sepHor, 7); grid.getChildren().add(sepHor); friday.setFont(Font.font(Verdana, 18); GridPane.setConstraints(friday, 0, 2); GridPane.setColumnSpan(friday, 2); grid.getChildren().add(friday); final Separator sepVert1 = new Separator(); sepVert1.setOrientation(Orientation.VERTICAL); sepVert1.setValignment(VPos.CENTER); sepVert1.setPrefHeight(80); GridPane.setConstraints(sepVert1, 2, 2); GridPane.setRowSpan(sepVert1, 2); grid.getChildren().add(sepVert1); saturday.setFont(Font.font(Verdana, 18); GridPane.setConstraints(saturday, 3, 2); GridPane.setColumnSpan(saturday, 2); grid.getChildren().add(saturday); final Separator sepVert2 = new Separator(); sepVert2.setOrientation(Orientation.VERTICAL); sepVert2.setValignment(VPos.CENTER); sepVert2.setPrefHeight(80); GridPane.setConstraints(sepVert2, 5, 2); GridPane.setRowSpan(sepVert2, 2); grid.getChildren().add(sepVert2); sunday.setFont(Font.font(Verdana, 18); GridPane.setConstraints(sunday, 6, 2); GridPane.setColumnSpan(sunday, 2); grid.getChildren().add(sunday); final ImageView cloud = new ImageView(cloudImage); GridPane.setConstraints(cloud, 0, 3); grid.getChildren().add(cloud); final Label t1 = new Label(16); t1.setFont(Font.font(Verdana, 20); GridPane.setConstraints(t1, 1, 3); grid.getChildren().add(t1); final ImageView sun1 = new ImageView(sunImage); GridPane.setConstraints(sun1, 3, 3); grid.getChildren().add(sun1); final Label t2 = new Label(18); t2.setFont(Font.font(Verdana, 20); GridPane.setConstraints(t2, 4, 3); grid.getChildren().add(t2); final ImageView sun2 = new ImageView(sunImage); GridPane.setConstraints(sun2, 6, 3); grid.getChildren().add(sun2); final Label t3 = new Label(20); t3.setFont(Font.font(Verdana, 20); GridPane.setConstraints(t3, 7, 3); grid.getChildren().add(t3); stage.show(); public static void main(String args) launch(args); 该应用使用了水平和垂直分隔线，并在GridPane容器中跨了行和列。也可以为分隔线设置优先的长度(水平分隔线的宽度和垂直分隔线的高度)这样界面大小改变时就能动态伸缩了。可以为Separator对象应用CSS来改变分隔线的视觉外观。美化Separator要为Example 14-3中的分隔线应用相同的效果，可以创建CSS文件(例如controlStyle.css) 并保存在应用主类的相同包中。Example 14-4是一些可以加入到controlStyle文件的CSS类。Example 14-4 Using CSS Classes to Style Separators/*controlStyle.css */ .separator -fx-background-color: #e79423; -fx-background-radius: 2; 可以