java布局(java布局)

java布局（java布局）java布局(java布局)GridBagLayoutFree setting component locationBefore use, set the layout to setLayout (), and the parameter is empty, that is, setLayout (null).Create a layout for the component's (x, y) coordinates, as well asthe width and height as parameters.SetBonds (new, Rectangle (int, x, int, y, int, W, int, H)): parameters are coordinates and width, height.The setSize (int, int) sets the size of the componentThe setLocation (int, int) sets the coordinates of the components Example: Rectangle, re=new, Rectangle (10,10,50,30);Button.setBounds (re);Sequential layout (FlowLayout)Constructor:FlowLayout (): establish the sequence layout manager by default that the components on each row will be centered;FlowLayout (int): Specifies alignment, no arguments,FlowLayout.CENTER, or 1: the components on each row will be centered; arguments FlowLayout.LEFT or 0: left justified; argumentsFlowLayout.RIGHT or 2: right aligned.FlowLayout (int, int, int): a parameter: FlowLayout.LEFT and FlowLayout.CENTER center, left FlowLayout.RIGHT, right aligned; two parameters: the horizontal spacing between components, in pixels; three parameters: the vertical spacing between components, in pixels.Method:SetLayout (): Associate containers with layout managers;GetAlignment (): get the alignment;SetAlignment (): sets the alignment;SetHgap (): sets the horizontal spacing;SetVgap (): sets the vertical spacing.Grid layout (GridLayout)Constructor:The GridLayout (int, int) parameters are the number of rows and the number of columns. If the row number and column number do not match the actual number, the number of rows is satisfied first.GridLayout (int, int, int, int) parameter one or two: row number and column number respectively. Parameter three or four: horizontal spacing and vertical spacing, respectively. The default horizontal spacing and vertical spacing are 0.Method:SetHgap (): sets the horizontal spacing;SetVgap (): sets the vertical spacing.Border layout (BorderLayout)Constructor:GridBagLayout (): create a grid bag layout;GridBagConstraints (): creates a grid bag layout assistant. Properties that are used to set components: layout, size, alignment, etc..Steps to create grid bags:1) creates a GridBagLayout object and specifies it as the current layout manager;2) create a GridBagConstraints instance;3) set the constraint for the component;4) tell the layout manager the components and theirconstraints;5) add components to a container.Method:BuildConstraints (): accepts seven arguments: aGridBagConstraints object and six integers:Gridx and gridy: the coordinates of the cells in which the component is located;Gridwidth and gridheight: the number of cells, rows, and rows spanned by the component;Weightx and weighty: sets the ratio of rows and columns.SetConstraints (): associate with an object. Two parameters are received: the component and the constraints of the component. Constraints: fill and anchor.The constraint fill determines which direction the component extends. Fill takes four values: they are the four class variables in GridBagConstraints:GridBagConstraints.BOTH: stretch in two directions to fill the cell;GridBagConstraints.NONE: display components in the smallest size;GridBagConstraints.HORIZONTAL: the components stretch horizontally;GridBagConstraints.VERTICAL: the components extend in the vertical direction.The constraint anchor determines how the cell is displayed. Auchor takes the four class variable in GridBagConstraints:CENTER, NORTH, EAST, SOUTH, WEST, NORTHEAST, SOUTHEAST, SOUTHWEST, NORTHWEST. The default is CENTER.JAVA interface layout principle: because Java is a cross platform language, the use of absolute coordinates will obviously lead to problems, that is, in different platforms, different resolutions of the display effect is not the same. Java in order to realize the characteristics of cross platform and dynamic layout effect, Java will arrange all the components within the container to a layout manager is responsible for the management, such as: the order of the size of the components, such as position, when the container layout manager windowto move or resize components after how to change the function to the corresponding authorization to manage and use different algorithms and strategies layout manager is different, the container can be determined by selecting the layout layout manager is different. There are 6 kindsof layout managers in Java, and they can design complex interfaces by using 6 kinds of layout manager combinations, and they can display the same interface on different operating system platforms. The 6 layout managers are BorderLayout, BoxLayout, FlowLayout, GirdBagLayout, GirdLayout, and CardLayout. CardLayout must beused in conjunction with the other 5, not particularly. Eachinterface manager has its own functions.CardLayout (cassette layout)CardLayout layout manager can help users deal with two or more members share the same display space, the container is divided into many layers, the display space to occupy the entire container size of each layer, but each layer only allowed to place a component of each layer can be achieved by using the Panel complex user interface layout management. Device (CardLayout) is like a pair of neatly folded cards, 54 cards, but you can only see the top of a card, each card is equivalent to the layout manager in each layer. The implementation procedure is as follows:First, define the panel, set different layouts for each panel, and place the components in each panel as needed:PanelOne.setLayout (new, FlowLayout);PanelTwo.setLayout (New GridLayout (2,1));Set the main panel againCardLayout card = new, CardLayout ();PanelMain.setLayout (card);The next step is to start the prepared panels and add them to the main panelPanelMain.add ("red panel", panelOne);panelmain。