Summary of JFrame knowledge points 2

1.   Add border

The first way to write it ：

Border border=new LineBorder(Color.BLUE,4);// Linear border

a1.setBorder(border1);

among ,Border It's the interface ,LineBorder Is the concrete implementation class

Another way of writing ：

Border border2=BorderFactory.createLineBorder(Color.RED,4);

a2.setBorder(border2);

among ,BorderFactory It encapsulates many tools and methods （static）, Used to create format borders

1. Border style ：

// Linear border

Border border1=BorderFactory.createLineBorder(Color.RED,4);

       a1.setBorder(border1);

       // Dotted box

       a1.setBorder(BorderFactory.createDashedBorder(Color.RED,4,2));

       // Separate borders , Specify the width of each box

       Border border2=BorderFactory.createMatteBorder(0,0,4,0,Color.DARK_GRAY);

       a2.setBorder(border2);

       //3D Frame

       Border border3=BorderFactory.createRaisedBevelBorder();

       a3.setBorder(border3);

             

       Border border4=BorderFactory.createEtchedBorder(EtchedBorder.RAISED);

       a3.setBorder(border4);

       // Combine borders

       Border bbb=BorderFactory.createCompoundBorder(border1,border2);//border1 Outside ,border2 Inside

       a4.setBorder(bbb);

1. Borders and margins ：
2. Blank border ：

Blank border EmptyBorder, It is usually set in the sentence on the inner wall

for example ：

root.setBorder(BorderFactory.createEmptyBorder(6,6,6,6));

1. Dialog box ：

JOptionPane, With message prompt box

-JOptionPane.showMessageDialog(), Message box

- JOptionPane.showConfirmDialog(), Message confirmation box

- JOptionPane.showInputDialog(), Input prompt box

among ,show*（） All tools and methods , Static method （static）

1. File selection dialog ：

JFileChooser The file selection box is used to select a file / Catalog

JFileChoose Use ：

1 Show dialog showOpenDialog()/showSaveDialog()

2 Determine the return value

     APPROVE_OPTION, The user confirmed the selection

     CANCEL_OPTION, The operation was cancelled by the user

3 Get the file path

      File file=chooser.getSelectedFile()

-showOpenDialog()

   When you need to open a file, call

   -showSaveDialog()

   When you need to save a file, call

   -showOpenDialog()/DIRECTORIES_ONLY

   When you need to choose one

1. Custom dialog ：

JDialog, Represents a dialog window

Class SimpleDialog extends JDialog{

}

and JFrame Usage is similar. , Make interface layout in the construction method

JDialog At tectonic time , Need one owner Belong to , That is, from which window he jumped out

   public SimpleDialog (Window owner){

       super(owner);

}

among ,Window yes JFrame、JDialog

Show dialog ：

SimpleDialog dlg=new SimpleDialog(this);

dig.setTitle(“ Tips ”);

dlg.setModal(true);// Modal （ Blocking mode ）

dlg.setSize(200,100);

dlg.setVisible(true);

Modal Modal , That is, display in a blocked way ：

  1 The interface is blocked , When the dialog box is displayed , The back window owner Lose focus

  2 Programmatically blocked ,dlg.setVisible（） Has been running , Until the dialog box is closed

1. Get user input ：

1. In the dialog , Add a text box

JTextField userInput=..

1. When the dialog box closes , Get user input

public String getValue(){

}

1. Confirm or cancel ：

1 add to “ determine ”、“ Cancel ” Button

2 Add a field

public boolean accepted=false;

3 Event handling , Click the OK button ,

this.accepted=true;

this.setVisible(false);

4 Judge the result of the dialog , Judge the user's operation It's to be sure 、 Or cancel ？

If(dlg.accepted){

}

1. Dialog box display location ：

-centerOwner() Display in the original central position

-centerInScreen() Displayed in the center of the screen

Be careful , This line should be placed in setVisible() Before ,setSize() after

11.Component

   see JFrame Inheritance tree of , Window class

  JFrameàWindowàComponent

   see JDialog

  JDialogàWindowàComponent

   see JButton Inheritance tree of   Control class

  JButtonàJComponentàComponent

1. Get the window where a control is located , The following two methods can be used ：

Window win =SwingUtilities.windowForComponent(comp);

perhaps

Window win =SwingUtilities.getWindowAncestor(comp);

among ,comp Represents a control

1. Right-click menu

JPopupMenu Right-click menu , Or context menu

1 Respond to the right mouse button click

2 Pop up menu

 - establish JPopupMenu menu

 - add to JMenultem A menu item

 - Pop up menu window popup.show()

13. Menu item processing ： When a menu item is selected , Execute response processing

   JMenuItem

   item.addActionListener(listener)// Add listener

   item.setActionCommand(“save as”)// Add command code

1. List box

JList The list box control displays a list of data items

1 Create list box

  JList<T> listox=new JList<>();

and JComboBox similar ,T Is the type of data item

2 Add scroll bar

  JScrollPane scrollPane=new JScrollPane(listbox);

  Is actually the JList The control package is placed in JScrollPane in , Support scrolling

3 Add window

 root.add(scrollPane,BorderLayout.CENTER);

   4 Set up the data

     DefaultListModel<String> model=new DefaultListModel();

     Model.addElement(“ Holding pressure ”);

     …

     listbox.setModel(model);

In programming ,Model Generally, it means data

1. Single choice

JList There is a single choice mode , And multi choice mode

Radio mode ：

listbox.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);

List item operation ：

- Add a

model.addElement(value)

model.add(index,value)

- To delete a

index=listbox.getSelectedIndex() , Index selected by the user Unselected send back -1

value=listbox.getSelectedValue()  Which item the user selected

model.remove(index)  Delete

Multiple choice mode ：

ListSelectionModel.MULTIPLE_INTERVAL_SELECTION

Press Crtl Select multiple intervals , Press Shift Multiple choices in a row

Get the selected index ：

int indexArray=listbox.getSelectedIndices();

perhaps

List <String> values=listbox.getSelectedValueList()

When multiple items are deleted , It should be deleted from the back to the front

Int[] indexArray=listbox.getSelectedIndices();

for(int i=indexArray.length-1;i>=0;i--){

   int index=indexArray[i];

   model.remove(index);

}

1. List box mouse click event processing

default ,JList A mouse event listener has been added inside , When you click the left mouse button , Perform the selected operation

Left click processing ：

step ：

1 Delete the original mouse listener

  Listbox.removeMouseListener()

  Listbox.removeMouseMotionListener()

2 Add your own mouse listener

  Listbox.addMouseListener()

   And determine whether the mouse is BUTTON1

relevant API：

-listbox.clearSelection() Clear options

-listbox.setSelectedIndex(index) Choose one

-listbox.addSelectionInterval(from,to) Add selection （ Multiple choice mode ）

-index=listbox.locationToIndex(point) Calculate the position of the point

-bounds=listbox.getCellBounds(index,index) Calculate the position rectangle of an item

Right click to process ：

default ,List The list box does not handle right clicking

direct addMouseListener() Add right-click processing .

1. Type of list item

JLis<T>listbox=new JList();

Data item T It can be of any kind , It can be String、Integer、Student…

And JComboBox<T> similar

1. Display of list box ：

Interface ListCellRenderer, Responsible for the display of list items , Including Fonts 、 Color 、 Row height 、 background 、 Selected state

step ：

1 Implement a class Renderer

Public class MyListCellRenderer implements ListCellRenderer{}

2 Use this Renderer

Listbox.setCellRenderer(new MyListCellRenderer())

Next , Each list item consists of this Renderer Responsible for the drawing

Selected state ：boolean isSelected

If（isSelected）{

  ..

}else{

  ..

}

1. Table control ：

JTable Table control , Used to display tabular data and JList Use similar

TableCellRenderer, Custom cell display ,

for example , The display of gender column ：

tableColumn column2=table.getColumnModel().getColumn(2);            column2.setCellRenderer(new TableRenderer_Sex());

1. Add and delete

Add a row , tableMode.addRow(vector)

Delete a line , tableMode.removeRow(index)

Get the selected line number , int [] rows=table.getSelectedRows()

Change the value of the cell , tableModel.setValueAt(new Value,row,column)

1. default , Double click a cell in the table to edit

To disable editing ,, Should be rewritten isCellEditable（） Method  

establish MyTable Class rewriting isCellEditable（） Order return false

1. Add right-click menu support to the table

22. Add dialog ：EditDialog