Returns a shared instance of a KeyStroke that represents a KEY_TYPED event for the specified character. KeyStroke object is retrieved by using API call like KeyStroke key = KeyStroke.getKetStroke(.)
Java (jdk 1.6.x or higher will be fine).KeyStroke class is a member of javax.swing package and any object of this class represents a key or a combination of keys in the keyboard. KeyStroke: InputMap and Keymap maps one KeyStroke object to a action name or action.Whichever component will have focus, action will take effect on that only. Whatever the instances of any of the type of component can be created, those will share the same Keymap instance. In an application, if it is no further customized, we can have shared Keymap created for each of JTextField, JPasswordField, JTextArea, JTextPane and JEditorPane. The JTextComponent class has a default Keymap implementation as well as some static methods for manipulating Keymap.Ī Keymap is map of key event to some kind of command that gets executed whenever the said event is triggered. Keymap is an interface defined in package. It is not absolutely necessary that text operation should use Keymap but text operations not using Keymap do not perform well Swing’s pluggable look-and-feel environment. Keymap: Keymap actually helps to map keyboard events to actions.InputMaps correspond to JComponent.WHEN_FOCUSED, JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT and JComponent.WHEN_IN_FOCUSED_WINDOW. Each JComponent has 3 InputMaps and 1 ActionMap. Thus any binding specified by the developer is maintained across different look and feel. Anytime the look and feel is changed, the parent is reset. Each InputMap/ ActionMap has a parent that typically comes from UI. InputMap and ActionMap both are just tables or maps where first one binds key strokes by means of KeyStroke objects to action names and second one specifies actions corresponding to each action name. For each JComponent control we can extract the corresponding InputMap and ActionMap. InputMap and ActionMap: InputMap and ActionMap are class members of javax.swing.Key binding helps us to map keyboard to action mapping. Most of the manipulations performed on text components involve keyboard operations. Using Keymap or InputMap and ActionMap combination, it is easier to map the action to a specific key stroke and thus key binding is achieved. import where KeyListener is used in order to map key input to some action, it is more convenient and preferred from usimg Keymap or InputMap and ActionMap combination instead. The default Orientation for flow layout is left to right, however we can set it to right to left if want. Public class FlowLayoutDemo extends Frame Flow Layout where Orientation is right to left
Here we are adding 8 buttons to a Frame and layout is being set to FlowLayout. The image shown above is the output of this code. By default the components Orientation is left to right, which means the components would be added from left to right, however we can change it to right to left as well, we will see that later in this post.The default horizontal and vertical gap between components is 5 pixels.However we can set the alignment to left or right, we will learn about it later in this post. As you can see in the above image that buttons 7 & 8 are in center. All rows in Flow layout are center aligned by default.As you can see buttons 7 & 8 are in second row because first six buttons consumed all horizontal space. Flow layout puts components (such as text fields, buttons, labels etc) in a row, if horizontal space is not enough to hold all components then Flow layout adds them in a next row and so on.Įxample: Here is the image of a Frame where eight buttons have been added to a Frame under Flow layout.
Flow layout is the default layout, which means if you don’t set any layout in your code then layout would be set to Flow by default.