[英]How do I make a mouse click event be acknowledged by a TreeItem in a TreeView?
The fxml file is as follows (headers omitted): fxml 文件如下(头文件省略):
<BorderPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity"
minWidth="-Infinity" prefHeight="600.0" prefWidth="800.0"
xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1"
fx:id="pane"
fx:controller="com.github.parboiled1.grappa.debugger.mainwindow.MainWindowUi">
<top>
<MenuBar BorderPane.alignment="CENTER">
<Menu mnemonicParsing="false" text="File">
<MenuItem fx:id="loadInput" mnemonicParsing="false"
text="Load file" onAction="#loadFileEvent"/>
<MenuItem fx:id="parse" mnemonicParsing="false"
text="Parse" onAction="#parseEvent"/>
<MenuItem fx:id="closeButton" mnemonicParsing="false"
text="Close" onAction="#closeWindowEvent"/>
</Menu>
</MenuBar>
</top>
<center>
<SplitPane dividerPositions="0.5" prefHeight="160.0" prefWidth="200.0"
BorderPane.alignment="CENTER">
<SplitPane dividerPositions="0.5" orientation="VERTICAL">
<TreeView fx:id="traceTree" prefHeight="200.0"
prefWidth="200.0" editable="false"/>
<TextArea fx:id="traceDetail" prefHeight="200.0"
prefWidth="200.0"/>
</SplitPane>
<TextArea fx:id="inputText" prefHeight="200.0" prefWidth="200.0"/>
</SplitPane>
</center>
</BorderPane>
I can set the root of the TreeView
with no problem at all.我可以毫无问题地设置
TreeView
的根。 The tree is updated with no problem.树更新没有问题。
The problem I have is that I cannot manage to have an event fired on a given item in the view.我遇到的问题是我无法在视图中的给定项目上触发事件。 I tried and added a
onMouseClicked
event with a simple System.out.println() and I can see the event being fired, whichever item I click in the tree.我尝试使用简单的 System.out.println() 添加了一个
onMouseClicked
事件,我可以看到正在触发的事件,无论我在树中单击哪个项目。 But I cannot manage to get the item which has been clicked in the view at all.但是我根本无法获得在视图中单击的项目。
How do I do that?我怎么做?
Register a mouse listener with each tree cell, using a cell factory.使用单元工厂为每个树单元注册一个鼠标侦听器。 I don't know the data type you have in your
TreeView
, but if it were String
it might look something like this:我不知道您的
TreeView
的数据类型,但如果它是String
它可能看起来像这样:
// Controller class:
public class MainWindowUi {
@FXML
private TreeView<String> traceTree ;
// ...
public void initialize() {
traceTree.setCellFactory(tree -> {
TreeCell<String> cell = new TreeCell<String>() {
@Override
public void updateItem(String item, boolean empty) {
super.updateItem(item, empty) ;
if (empty) {
setText(null);
} else {
setText(item);
}
}
};
cell.setOnMouseClicked(event -> {
if (! cell.isEmpty()) {
TreeItem<String> treeItem = cell.getTreeItem();
// do whatever you need with the treeItem...
}
});
return cell ;
});
}
// ...
}
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