Public void setToolTipText(String toolTipMsg) Most of the JComponents have default of true, except JLabel. otherwise, enable transparent background. If true (opaque), fill the background with background color Sets the preferred, maximum or minimum size of this component. Public void setMinimumSize(Dimension dim) Public void setMaximumSize(Dimension dim) Public void setPreferredSize(Dimension dim)
Sets the foreground (text) color of this component Sets the background color of this component
TRACK MOUSE COORDINATES OUTSIDE OF WINDOW JAVA WINDOWS
Keyboard short-cut (called mnemonics), e.g., activated via the "Alt" key in Windows System.Most of the Swing Components supports these features: Setting the Appearances and Properties of JComponents The Image object is used in the drawImage() method for custom drawing (which shall be discussed later). You can retrieve this Image object via the ImageIcon's getImage() method. JLabel lbl = new JLabel("The Duke", iconDuke, JLabel.CENTER) Īn ImageIcon uses an object to hold the image data. URL imgURL = getClass().getClassLoader().getResource(imgFilename) String imgFilename = "images/duke.gif" // relative to project root (or bin) Many JComponents (such as JLabel, JButton) accepts an ImageIcon in its constructor, or via the setIcon() method. Using URL is more flexible as it can access resources in a JAR file, and produces an error message if the file does not exist (which results in a null URL). Filename always relative to the root of the project (i.e., bin) imgURL = getClass().getClassLoader().getResource(imgFilename)
Construct an ImageIcon via an image URL (in the form of file://path/filename) ImageIcon iconDuke = new ImageIcon(imgFilename) // OR Can use an absolute filename such as "c:/project/images/nought.gif" For example, // Construct an ImageIcon from an image filename Image file type of GIF, PNG, JPG and BMP are supported. To construct an ImageIcon, provide the image filename or URL. The ImageIcon class implements interface, and hence, often upcasted and referenced as Icon. An ImageIcon is a fixed-size picture, typically small, and mainly used for decorating GUI components. For example, the figure shows three buttons: one with text label, one with an image icon, and one with both text and icon. Many Swing's JComponents (such as JLabel and JButton) support a text label and an image icon. JComponent and its descendants are lightweight components. The class hierarchy of Swing's JComponents is as follows. These top-level Swing containers are heavyweight, that rely on the underlying windowing subsystem of the native platform. The class hierarchy of Swing's top-level containers ( JFrame, JDialog, JApplet) are as follows. New Listener(), AWTEvent.MOUSE_EVENT_MASK | AWTEvent.FOCUS_EVENT_MASK) įtDefaultCloseOperation(JFrame.JDK demo includes a folder " jfc", which has many interesting demo on Swing and Java2D. Toolkit.getDefaultToolkit().addAWTEventListener( If you don't want to lose focus then you will have to temporarily take a screenshot of the whole screen and display that in a screen filling window which listens for a mouse click as usual. So depending on what you are ultimately trying to achieve this might not be useful. The limitation is that, of course, your app loses focus. As long as your app has focus before the button is clicked you'll receive a focus lost event. Add an AWTEventListener for focus events.
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