In JavaFX, if I have a scene with 2 VBox elements and each VBox has multiple Label in it.
If I set the top VBox to invisible, why does the bottom VBox not move up the scene where the top VBox was ?
The VBox is invisible but I would expect the other objects to move into its place.
I am using FXML to load my controls.
Node.setVisible(boolean) just toggles the visibility state of a Node.
To exclude a Node from its parents layout calculations you additionally have to set its managed state, by calling Node.setManaged(false).
If you want the managed state to be updated automatically alongside the visibility, you can use a binding as #jewelsea pointed out: node.managedProperty().bind(node.visibleProperty());
Since it's invisible, it wont move to the top. You have to remove it with something like:
// remove
vbox.getChildren().remove(...)
Once you've removed the element you want invisible then, the other element should move to the top.
Try to use setVisible and managedProperty together. Here is an example:
myHBox.setVisible(false);
myHBox.managedProperty().bind(myHBox.visibleProperty());
Instead of hiding the vbox you should remove it from the Children and if you want to show it again add the vbox again.
If l want to hide and unhide a node,
I resize the node to 0 if l want to hide it. That way, the node will not occupy space since is not visible to the user, so when l want it to be visible, l adjust the size again for it to be visible.
Related
In one of my javafx projects I have a button that triggers the program. Upon displaying new data sometimes the button is pushed downwards due to other components of the borderpane expanding. Any way I can lock the button to a specific position so that it does not move if that occurs?
You could try placing the button on a separate Pane outside of the BorderPane, then grouping both Panes on a root Pane/main Pane of some sort, like so:
Any layout changes to child components of the BorderPane will not affect the layout of any components outside of it.
As you can see though, this leaves empty space at the top of the application. You can overlap the StackPane with the Button on top of the BorderPane if you fiddle with its layout settings, but this does mean that any child components of the BorderPane can be hidden behind the StackPane. It's up to you to decide which way you prefer.
I dont want to use a gridpane.
So I have an HBox:
HBox fooBar = new HBox();
fooBar.setHeight(100);
fooBar.setWidth(100);
fooBar.setAlignment(pos.BOTTOM_LEFT);
I gave it a color in css.
I include it into my scene and for some reason the box stays stuck on the bottom left corner. Is there any way to position it?
I forgot to mention: this hbox is the child of another hbox where I didnt define any position or dimension.
Hbox is a component which determine position own children. If you want change position you should change alignment property in parent. It impact for all children. You couldn't change position for one child. All children have to be obedient.
You can use Pane for absolute positioning.
Updated: question is incorrect because of low knowledge of the subject. Sorry.
I'm trying to create a small application that shows a graph that contains nodes and connections between them. Both nodes and connections are complex, I mean they can have another components in it, like labels.
I have a big Pane which plays a canvas role. I'm going to add and remove elements from it. The problem is that I want to add or remove graph elements dynamically, using buttons or context menu. Sort of Paint for Graphs :) And I have no idea how to implement it.
Especially I desperately need help in dynamical adding/removing mechanism. I would be very grateful for your help!
Just get the child list of the pane you want to add stuff to, and add the stuff when the appropriate action occurs.
FlowPane pane = new FlowPane();
Button addNode = new Button("Add");
addNode.setOnAction(e -> pane.getChildren().add(new Circle(10));
Notes:
If you want to use a Pane rather than a FlowPane, then Pane has no internal layout, so you need to also set the layoutX and layoutY properties appropriately when you add to the Pane.
If you want to change the rendering order of nodes in the Pane (e.g. which nodes are rendered on the bottom and which on top), then you do that by adding new nodes at an appropriate position in the child list; for example, pane.getChildren().add(0, new Circle(10)), will add a circle that is rendered underneath all other children of the pane rather than on top.
Related question: Nodes - Choose the Layer to appear JavaFX2
I'm using JavaFx 8 with SceneBuilder 2. I have a number of panes as children of a StackPane and I would like to make only the front Node visible. I need to do this without disabling visibility of the other children, and I've tried to do this using the opacity setting seen below (ignore the fact that visibility is disabled):
Without disabling the visiblity of the other child nodes, the children are always drawn over each other, even when using different blend modes (SRC_OVER & SRC_ATOP), as seen below:
The reason I would like to avoid setting visibility to false of the child elements is that I want to animate a transition between the panes, in which one pane needs to be draw over the top of the other.
I must be missing something obvious here, but I can't see what it is?
The answer is to set the background colour of the panes. Opacity has no effect without first setting a background colour.
You could try setting the visibility to false.
To do that, call setVisible(false) on the node you'd like to render invisible in the StackPane.
See Node::setVisible
I have a VBox that enters an edit mode if the user chooses to. How can I prevent the mouse from the leaving that VBox and clicking on other things?
Alternatively, how do I BLOCK OUT the rest of the application and make sure they aren't clickable? (Making them a lighter tint would show this too. Like how Adobe Illustrator enters a shape's edit mode).
Add a separate Pane to your layout and set its visibility to false and its style to something like -fx-background-color: #00000077. Add your VBox on top of that Pane (but not as a child of the Pane). Your layout should be something like this:
layout
-> controls
-> pane
-> vbox
Where layout is your main layout node, controls is your node containing most of your interface, pane is the dimming Pane, and vbox is the VBox you want to be emphasized. The children should be added in that order.
Whenever a node in vbox has focus, show pane (and hide it when focus is lost or your accept the user's input). pane, when visible, will prevent the user from interacting with other parts of your interface, specifically any node within layout (except vbox).