In all major Java IDEs, there is a GUI designer.
When we select a component (A Jbutton, for example) and move it to a JPanel or JFrame, how is it done?
Is it a copy of the dragged component that is created on the other container?
On a project I'm working on, I have some JButton I would like to be able to drag to a panel. Theses JButton represent some actions, like "copy file", "move file", etc...
When one of those JButton is dragged, some options of the action will be displayed.
I checked TransferHandler but I don't know if it's the way to go. Is it?
It's certainly possible. You'll need to study the Drag and Drop tutorial. In particular, you may want to implement Drop Location Rendering, discussed here, to symbolize the action.
By encapsulating a button's name, icon, listener, etc. in an Action instance, your importData() implementation can easily use setAction() to change the target button's behavior dynamically.
An alternative approach might be to add your buttons to a JToolBar. In normal mode, clicking the button evokes the Action; in editor mode , clicking the button changes the Action, again via setAction(), to one chosen from a list.
Related
I have set up a mouse dragged listener. I trying to set it up where you can click one button then drag your mouse over others to click the other ones. The problem I am having is when you click the first button it turns grey like its waiting for you to release the mouse button. When you move your mouse off the button (still holding the left mouse button) it returns back to its normal color but you cant highlight anything until you let go. Is there anyway to simulated letting the mouse go and "unclicking" the button so you can highlight other things?
What you observe is the typical behavior of the ButtonModel used by Swing buttons. A complete example is examined here, but note how the effect depends on the chosen Look & Feel's ButtonUI delegate.
To get the effect you want, you would have to create buttons using your own variation of BasicButtonUI and a custom ButtonModel that uses isRollover() to add buttons to your program's notion of a selection model.
As an alternative, consider JList, which contains a ListSelectionModel that allows MULTIPLE_INTERVAL_SELECTION. A compete example is shown here.
I have a custom JFrame. On the title bar I have an icon in the top left, a title, and then the standard minimize, maximize, and close buttons on the right.
When I click the icon in the title bar I get the standard options: Restore, Move, Size, Minimize, Maximize, Close.
How can I add my own menu option here? I'd like to add and "Always On Top" option here.
Additionally I'd like to add a button next to the max,min,close buttons on the title bar to allow uses to toggle the "Always On Top" state of the JFrame.
You could create your own customized Components. To do that, create a new class which extends JMenuBar for example and override the methods which fit your needs. Very often, for example, one wants to override paintComponent(Graphics).
That is not what you want, 'though. Customizing the JMenuBar wont work as you expect it to. The "JMenuBar" is another bar below the title bar. I am Mac user, but as far as my knowledge goes, it is not possible to customize the title bar, because that isn't handled by the JVM. The only thing that is modifiable without using native code is the Icon in the top left.
For further information on that, look at this question and the best answer there. This will help you a lot.
Your problem (adding a button at the top for toggling the alwaysOnTop status) is best solved by creating normal instances of a JMenuBar, a JMenu and a JMenuItem.
To then add that MenuBar to your Frame, use JFrame.setJMenuBar(JMenuBar). See also How to use Menus.
I hope this helps!
I extended JButton so it would fit my needs. I have one JTextArea and two JLabel components inside of my new class. The problem is, that I cannot click through JTextArea. So, when mouse is in JTextArea bounds, the button is not responding. There is no problem with labels.
As on screen. There are four buttons. Each one is a separate yellowish rectangle. When mouse is over JTextArea's gray rectangle, I cannot press the button. I need JTextArea because it supports multiple lines. Is there any option to make it not intercept the mouse?
It would be ok if I could attach ActionListener to JTextArea, but I can't. It cannot have this kind of listener.
You look to be trying to use a JButton in a very non-button way, including having it hold a JTextArea, and not looking at all like a button. If you want a clickable area that is not an identifiable JButton, then consider using a MouseListener instead. You would likely have to add the same MouseListener to the container JPanel and the JTextArea.
Take a look at Concepts: Editors and Renderers to understand the difference between a renderer and an editor.
A renderer is a "rubber stamp" of the component, it is simply "painted" onto the surface of the JTable and is not a real life component
You would need to implement a custom editor, which could translate the trigger event (in your case the MouseEvent) into a local context.
Take a look at TableCellEditor#isCellEdtiable which is probably the closest you will get to the source of the event which might trigger the cell to become editable.
JButton could be seeded with a HTML String (`"This is some text"), which would be capable of supporting multiple lines and line wrapping as well
Having said all that, you might want to seriously reconsider your design...
I am making a UI with Swing, and I want the buttons I am using for my custom dialogs to have the same style as the ones in standard dialogs.
For instance, in the attached image I have a custom dialog and the standard file select dialog. I want the 'OK' and 'Cancel' buttons from the file select dialog to be used for the equivalent buttons in my custom dialog.
I want my application to use the default system look and feel of whatever OS it is running on, so I don't want to try to manually re-create these standard buttons. Using a more rigid Swing class that automatically provides these buttons wouldn't work either, as I'd like to also use them in other, more exotic places in my UI.
Is there an easy solution to this problem?
Sorry to be the bearer of bad news, but it look like there is no standard way to do this cross-platform. The behaviours, mnemonics and icons on default buttons are handled in very specific ways by each look-and-feel.
Here is a SO question that answers the question on how to set the default OK and Cancel buttons on a dialog (the default button is set using getRootPane().setDefaultButton(...) and the Cancel button needs a custom keyboard listener. If you're very lucky, setting the default button might add an icon to it, depending on how the UI is coded.
This forum thread addresses the issue of getting icon resources from the UIManager. Each LaF has a set of UI defaults such as colors, text, borders and icons. There are a number of default icons which are found across all LaFs, but for non-standard icons, such as ones on buttons, there are no guarantees. However, if you tell me which LaF you are using in the screenshot you provided, I can look up the resource keys used by its custom UI classes (or you can find it yourself if you have the source). You could then write a helper method which looks for the icons via these keys, and adds them to the buttons if they are found.
JButton.setUI(ButtonUI) sets the UI for just one JButton. Use that in conjunction with a factory:
public static JButton createStyledButton(String text) {
JButton button = new JButton(text);
button.setUI(STYLE_UI);
return button;
}
Is it possible to place a child component inside a JButton and make it transparent to a subset of mouse events so that:
The child component receives MouseMotionEvents (so it can respond by modifying a displayed image)
Clicking still depresses the JButton "behind" the child component
If you add the child component to the button but make no other changes, clicking in the area occupied by the child does not activate the button.
I know this can be achieved by creating a new class that extends JButton but I would prefer to use a child component which has already been written.
Note: this is purely for cosmetic reasons. The child component only changes its own appearance. It does not perform any other actions in response to clicks. There is just one Action, triggered by the button in the normal way.
Yes, it is possible but probably there are better ways to change the appearance of a JButton on mouse over. You can extend a ButtonUI to do that. However, if you want to drop a component over a JButton, you should pass other mouse events (e.g clicks) to the underlying JButton.
JXLayer is just the thing you need. Check out https://jxlayer.dev.java.net/
The project site has several good articles about JXLayer's usage for many different use cases.