Implementation of SWT multi-choice tree

 

Package cn.com. test;

IMPORT org. Eclipse. SWT. Widgets. display;
IMPORT org. Eclipse. SWT. Widgets. shell;
IMPORT org. Eclipse. SWT. Widgets. composite;
IMPORT org. Eclipse. SWT. SWT;
IMPORT org. Eclipse. SWT. Widgets. tree;
IMPORT org. Eclipse. SWT. Widgets. treeitem;
IMPORT org. Eclipse. SWT. Events. selectionadapter;
IMPORT org. Eclipse. SWT. Events. selectionevent;

Public class mainapp {

Protected shell;

/**
* Launch the application.
* @ Param ARGs
*/
Public static void main (string [] ARGs ){
Try {
Mainapp window = new mainapp ();
Window. open ();
} Catch (exception e ){
E. printstacktrace ();
}
}

/**
* Open the window.
*/
Public void open (){
Display display = display. getdefault ();
Createcontents ();
Shell. open ();
Shell. layout ();
While (! Shell. isdisposed ()){
If (! Display. readanddispatch ()){
Display. Sleep ();
}
}
}

/**
* Create contents of the window.
*/
Protected void createcontents (){
Shell = new shell ();
Shell. setsize (450,300 );
Shell. settext ("SWT application ");
{
Composite composite = new composite (shell, SWT. None );
Composite. setbounds (0, 0,434,262 );
{
Final TREE tree = new tree (composite, SWT. Border | SWT. Check | SWT. full_selection | SWT. Virtual | SWT. multi );

Tree. setbounds (0, 0,189,252 );
Final treeitem = new treeitem (tree, SWT. None );
// Treeitem. setchecked (true );
Treeitem. settext ("\ u5168 \ u90e8 ");
Final treeitem treeitem_2 = new treeitem (tree, SWT. None );
Treeitem_2.setchecked (false );
Treeitem_2.settext ("\ u5168 \ u90e82 ");
Final treeitem treeitem1 = new treeitem (treeitem, SWT. None );

Treeitem1.settext ("New treeitem1 ");
Treeitem1.setdata ("value", "You are my Rose ");
Final treeitem treeitem2 = new treeitem (treeitem, SWT. None );

Treeitem2.settext ("New treeitem2 ");
Final treeitem treeitem3 = new treeitem (treeitem, SWT. None );
Treeitem3.settext ("New treeitem3 ");
Final treeitem treeitem4 = new treeitem (treeitem, SWT. None );
Treeitem4.settext ("New treeitem4 ");
Treeitem. setexpanded (true );
Final treeitem treeitem2_1 = new treeitem (treeitem_2, SWT. None );

Treeitem2_1.settext ("New TreeItem2-1 ");
Final treeitem treeitem2_2 = new treeitem (treeitem_2, SWT. None );

Treeitem2_2.settext ("New TreeItem2-2 ");
Final treeitem treeitem2_3 = new treeitem (treeitem_2, SWT. None );
Treeitem2_3.settext ("New TreeItem2-3 ");
Final treeitem treeitem2_4 = new treeitem (treeitem_2, SWT. None );
Treeitem2_4.settext ("New TreeItem2-4 ");
Treeitem_2.setexpanded (true );
Final treeitem treeitem1_2_1 = new treeitem (treeitem2, SWT. None );

Treeitem1_2_1.settext ("New TreeItem2-1 ");
Final treeitem treeitem1_2_2 = new treeitem (treeitem2, SWT. None );

Treeitem1_2_2.settext ("New TreeItem2-2 ");
Final treeitem treeitem1_2_3 = new treeitem (treeitem2, SWT. None );

Treeitem1_2_3.settext ("New TreeItem2-3 ");
Final treeitem treeitem1_2_4 = new treeitem (treeitem2, SWT. None );

Treeitem1_2_4.settext ("New TreeItem2-4 ");
Treeitem2.setexpanded (true );
Tree. addselectionlistener (New selectionadapter (){
// Multiple selection boxes of the parent directory for iterative Selection
Private void selectallsubitems (treeitem selectedtreeitem ){
Treeitem [] selection = selectedtreeitem. getitems ();
For (INT I = 0; I <selection. length; I ++ ){

Selection [I]. setchecked (selectedtreeitem. getchecked ());

Selectallsubitems (Selection [I]);
}
}
Private void selectallparentitems (treeitem selectedtreeitem ){

Treeitem parenttreeitem = selectedtreeitem. getparentitem ();

// When a parent node is not selected, cancel the selection of the parent node. When all are selected, the parent node is selected.
If (parenttreeitem! = NULL ){
Treeitem [] parentsubitems = parenttreeitem. getitems ();

Boolean allchecked = true;
For (INT I = 0; I <parentsubitems. length; I ++ ){
Allchecked = parentsubitems [I]. getchecked ();
If (! Allchecked ){
Break;
}
}
Parenttreeitem. setchecked (allchecked );
Selectallparentitems (parenttreeitem );
}
}
@ Override
Public void widgetselected (selectionevent e ){
If (E. Detail = SWT. Check ){
Treeitem selectedtreeitem = (treeitem) E. item;
String value = (string) selectedtreeitem. getdata ("value ");

System. Out. println (value );
// If a parent node exists, select the parent node
Selectallparentitems (selectedtreeitem );
// If a subnode exists, select all the subnodes.
Selectallsubitems (selectedtreeitem );
} Else {
System. Out. println ("Other events ");
}
}
});
}
}

}
}