我有三个问题:
- 我想创建带有框边界的可调整大小的形状......
- 我还想知道如何在窗格中选择子项。
- 我正在一个窗格上创建多个形状。我想改变该形状的一些属性,比如填充..我该怎么做?
Thanx
下一个例子将回答您的问题:
- 对于(1),它使用绑定,将窗格大小与矩形大小连接起来
- 对于(2)它添加
setOnMouseClick
对于存储单击的每个矩形lastOne
field.
-
(3) 参见代码setOnMouseClick()
handler
public class RectangleGrid extends Application {
private Rectangle lastOne;
public void start(Stage stage) throws Exception {
Pane root = new Pane();
int grid_x = 7; //number of rows
int grid_y = 7; //number of columns
// this binding will find out which parameter is smaller: height or width
NumberBinding rectsAreaSize = Bindings.min(root.heightProperty(), root.widthProperty());
for (int x = 0; x < grid_x; x++) {
for (int y = 0; y < grid_y; y++) {
Rectangle rectangle = new Rectangle();
rectangle.setStroke(Color.WHITE);
rectangle.setOnMouseClicked(new EventHandler<MouseEvent>() {
@Override
public void handle(MouseEvent t) {
if (lastOne != null) {
lastOne.setFill(Color.BLACK);
}
// remembering clicks
lastOne = (Rectangle) t.getSource();
// updating fill
lastOne.setFill(Color.RED);
}
});
// here we position rects (this depends on pane size as well)
rectangle.xProperty().bind(rectsAreaSize.multiply(x).divide(grid_x));
rectangle.yProperty().bind(rectsAreaSize.multiply(y).divide(grid_y));
// here we bind rectangle size to pane size
rectangle.heightProperty().bind(rectsAreaSize.divide(grid_x));
rectangle.widthProperty().bind(rectangle.heightProperty());
root.getChildren().add(rectangle);
}
}
stage.setScene(new Scene(root, 500, 500));
stage.show();
}
public static void main(String[] args) { launch(); }
}
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