在JavaFX GridPane中替换（row，col）上的一个节点 [英] Replace a node at (row,col) in a JavaFX GridPane

问题描述

我正在基于感知和吃食物的错误进行网格式游戏/模拟。我正在使用一个gridPane（称为 worldGrid ）的标签来显示错误和食物的网格。当一个错误将细胞移动到食物等时，这显然会不断更新。

我目前有一个函数 updateGrid（int col，int row ，String cellContent）我想用[row，col]中的标签替换在cellContent中具有新文本的标签。

我有以下作品

  worldGrid.add（new Label（cellContent），row，col）; 
  

然而，我担心这只是在当前标签之上添加标签，显然超过100次迭代的模拟不太理想。

我在添加标签之前尝试过：

  worldGrid。 。的getChildren（）除去（行，列）; 
  

然而，我尝试时会得到一个 IllegalArgumentException 要做添加行。

有什么想法如何做到这一点？或者更好的是，有关如何最好地显示不断变化的网格的想法，最终会使用sprites而不是文本？

解决方案

由grid.add（node，col，row）提供的col / row（注意第一个来到col！）只是一个布局约束。这不提供任何方式来访问列或行，如2维数组中的插槽。所以要替换一个节点，你必须知道它的对象本身，例如记住它们在一个单独的数组。

然后你可以调用getChildren（）。remove（object）...例如：

  GridPane grid = new GridPane（）; 
 
 Label first = new Label（first）; 
 Label second = new Label（second）; 
 
 grid.add（first，1，1）; 
 grid.add（second，2，2）; 
 second.setOnMouseClicked（e  - > {
 grid.getChildren（）。remove（second）; 
 grid.add（new Label（last），2，2）; 
}）; 
 box.getChildren（）。addAll（grid）; 
  

I am making a grid-style game/simulation based on bugs "sensing" and eating food. I am using a gridPane (called worldGrid) of labels to show the grid of bugs and food. This is obviously going to be constantly updated when a bug moves cells towards food etc.

I currently have a function updateGrid(int col, int row, String cellContent) which I want to replace the label at [row,col] with a label that has the new text in cellContent.

I have the follow which works

worldGrid.add(new Label(cellContent), row,col);

however im worried that that is just adding a label on top of the current label and obviously over 100 iterations of the simulation thats not ideal.

I have tried this before adding the label:

worldGrid.getChildren().remove(row,col);

However I then get an IllegalArgumentException when trying to do the add line.

Any ideas on how to do this? Or even better, any ideas on how best to show a constantly changing grid that will eventually use sprites instead of text?

解决方案

The col/row provided by grid.add(node, col, row) (ATTENTION first comes col!) is only a layout constraint. This does not provide any means to access columns or rows like slots in a 2-dimensional array. So to replace a node, you have to know its object itself, e.g. remember them in a separate array.

Then you are able to call getChildren().remove(object)... e.g.:

GridPane grid = new GridPane();

Label first = new Label("first");
Label second = new Label("second");

grid.add(first,  1,  1);
grid.add(second,  2,  2);
second.setOnMouseClicked(e -> {
    grid.getChildren().remove(second);
    grid.add(new Label("last"), 2, 2);
});
box.getChildren().addAll(grid);

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