I want to make my jTable expandable while floating/overlay when dragging it using ComponentResizer class. I'm using ComponentResizer class from Rob Camick.
Currently as below after dragging the table:
I tried change my layout to null but the result still same.
In my code, I just added to call the ComponentResizer class:
ComponentResizer cr = new ComponentResizer();
cr.setSnapSize(new Dimension(10, 10));
cr.registerComponent(jScrollPane2);
I expect the dragging table will float and overlay the components below it.
Swing is designed to paint components in 2D space, not 3D space.
So when components are added to the same panel, Swing will paint components in the reverse order the component is added to the panel. In your case it looks like you add the components to the panel before adding the scrollpane to the panel.
So you could:
reverse the order in which you add the components to the panel
use the setComponentZOrder(...) method on the scrollpane to set its value to 0, so it is painted last.
However, this will still cause a problem because if you hover over the button the button will appear because its border is changed. This is because Swing assumes 2D layouts not 3D. If you want to make sure the table is always painted over the button you need to override the isOptimizedDrawingEnable() method of the panel. See Overlap Layout for more information on ZOrder painting.
I solved the problem by put all components in one layered pane and using Border Layout.
Related
I want to create a shop by having a main JPanel that each component inside it is a JPanel with an image, label and button.
I did tried using a JList but the problem with the JList its only holds the rendering of the component and because of that the button isn't working and its only an image. I can walk around and use MouseEvent but it feels wrong for me and I am sure that there is a better solution for it.
I want that the components will change their positions depend on the frame size, like in the JList.
For example, if I change from the width of the screen the positions of the components will change from this:
to this:
I do have an idea by using GridLayout or GridBagLayout in the paintComponent (because it calls every rendering. If you know another method that calls every rendering int the JPanel I would like to know) and changing the positions of the components by changing the layout variables inside the paintComponent.
I did surfed the internet to find a solution but I only found that people used JTable but I don't see it working here.
each component inside it is a JPanel with an image, label and button.
Makes sense.
changing the positions of the components by changing the layout variables inside the paintComponent.
The paintComponent() method has nothing to do with changing the layout of the panels. You should not be playing with the paintComponent() method.
I do have an idea by using GridLayout or GridBagLayout
You are correct to use a layout manager, but unfortunately, none of the default layout managers will wrap automatically at a random number of components.
The layout managers are invoked automatically as the frame is resized.
So you can use the Wrap Layout which is an extension to the FlowLayout that will allow random wrapping.
I'm having trouble getting my JButtons to appear where I want. For some reason all my buttons are appearing in the middle of the Panel when I want it to appear flushed with the top of the Panel, centered. I've tried manipulating different layout positioning such as BorderLayout.NORTH and GridBagConstraints.NORTH however I do not know if I utilizing it on the right components.
Currently my code has A Frame holding a JLayeredPane holding a JSplitPane with two JPanels in it so it has gotten quite confusing.
Do you have any suggestions on how I can get the buttons to appear on the top of the Panel?
I currently have the panel using a GridBagLayout
Read the section from the Swing tutorial on How to Use GridBagLayout for a working example and information about the constraints used by the layout manager.
For some reason all my buttons are appearing in the middle of the Panel
Specifically read the section on the weightx/y constraints, which states that the components will clump together in the center unless you use non-zero values.
I would like to scroll through the contents of my JFrame up and down, preferably with a scroll bar. I don't want to wrap the contents inside a JPanel or JScrollPane, because this causes some visual glitches with my application.
Any idea on how to do this?
JScrollPane would be the easiest way; you say there are glitches, but that probably indicates a problem in your code that will still be a problem even without using a JScrollPane.
If you're absolutely set on not using a JScrollPane, you should create a JPanel using BorderLayout, add a JPanel (call it 'center') with BorderLayout.CENTER and layout set to null. Add your content within 'center', and add another JScrollBar to BorderLayout.EAST, add an AdjustmentListener to the JScrollBar. When the adjustmentListener triggers, you need to move your content (Component.setLocation(...)) that's in center to the relative y offset of the JScrollBar and call repaint on 'center'
I'm trying to make a ToDoManager in java. For now I have about what I want it to be for a basic version. But I'm having a problem with the size of a panel.
I have a main JFrame. This contains a JPanel, say jPanel1.
jPanel1 has 2 buttons (add and remove) and another JPanel (say jPanel2).
jPanel2 contains a JScrollPane, which contains a modified version of JTable.
The thing I want is to tell the JTable to stretch out, so i can view everything in the JTable, and then tell the JScrollPane and jPanel2 to "Pack", or resize, so the JTable is completely vissable (if not possible the JScrollPane should do its work and draw the scrollbars).
This is what I have got at the moment:
So maybe you can see 2 problems:
1) The horizontal scroll bar does not appear. (But I did set the scroll bar: HORIZONTAL_AS_NEEDED)
2) I did not set any preferred size for the main JFrame, nor for the jPanel1, but it packs always as the same size. So I would like to stretch the jPanel2 to the full JTable, and if that would exceed the screen size, draw the scroll bars.
Using another layout manager, it's a lot easier to comprehend the usage of the JPanels and this concludes the problem.
In short, my need is to have a background Image in my java app, and upon some event, create some other graphics on top of that image.
I was thinking I would use a JPanel to draw the background image in, add it at to my JFrame the start of program, and then add other JPanels on top of that upon certain events. The problem is Swing gives the JPanels added first the highest Z index, so what should be my background is showing up on top of everything.
Is there any way to control the Z index/order of the JPanels, or am I going about this completely wrong?
You can use the setComponentZOrder() to handle Z-Order in your application.
Resources :
JavaDoc - Container.setComponentZOrder
oracle.com - Mixing heavy and light components
Sounds strange to add mutiple JPanels and use z-order. I would suggest you either simple add ONE JPanel with the paintComponent(Graphics g) method overwritten, where you draw the correct image according to your events.
Or use the CardLayout, and add JLabels (with different images), then when your event triggers, use
CardLayout cl = (CardLayout)getLayout();
cl.show(this, "card3");
to show the correct JLabel.
The JLayeredPane is designed for just this purpose. It allows you to control the Z-order of components.
I was thinking I would use a JPanel to
draw the background image in, add it
at to my JFrame the start of program,
Sounds reasonable.
and then add other JPanels on top of
that upon certain events. The problem
is Swing gives the JPanels added first
the highest Z index, so what should be
my background is showing up on top of
everything.
Adding a panel to a panel is just like adding another component to the panel. The child component will be painted on top of the parent panel. There is no need to play around with Z-Order.
The key is to set a layout manager on the panel with the image. Then each panel you add to the image panel must be made non-opaque so that the background image will be painted.
Maybe the Background Panel can help you out. It automatically makes any component added directly to the panel non-opaque.