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摘要: Eclipse SWT(标准部件工具包)提供了丰富的 API 集来实现定制部件(widget)。在这篇文章中,作者简要介绍了 MVC(模型-视图-控制器)架构,以结构化查看器的形式解释了 MVC 的当前实现,并介绍了一种使用定制 SWT 部件的实现。
public class ExampleView extends ViewPart { ... public void createPartControl(Composite parent) { // define a grid layout GridLayout layout = new GridLayout(); layout.numColumns = 1; layout.marginHeight = 0; layout.marginWidth = 0; l ayout.horizontalSpacing = 0; layout.verticalSpacing = 1; parent.setLayout(layout); // create widgets createActionBar(parent); createTree(parent); // add context menu and listeners viewer.addDoubleClickListener(this); viewer.addSelectionChangedListener(openAction); // register viewer so actions respond to selection getSite().setSelectionProvider(viewer); hookContextMenu(); } private void createTree(Composite parent) { viewer = new TreeViewer(parent, SWT.SINGLE | SWT.H_SCROLL | SWT.V_SCROLL | SWT.BORDER); viewer.setContentProvider(new ExampleViewContentProvider()); viewer.setLabelProvider (new ExampleViewLabelProvider()); viewer.setSorter(new ViewerSorter()); viewer.setInput(ModelManager.getExampleModel()); viewer.getControl().setLayoutData(new GridData(GridData.FILL_BOTH)); } ... }
public class ExampleViewContentprovide implements ITreeContentProvide {
/** * Register content provider with model. */ public void inputChanged(Viewer viewer, Object oldInput, Object newInput) { if (newInput != null) { this.viewer = viewer; this.model = (ExampleDelegate)newInput; this.model.addModelListener(this); } }
public void createPartControl(Composite parent) { ExampleEditLayout _layout = new ExampleEditLayout(parent,SWT.NONE,FieldMode.Read,new ExampleViewContentProvider()); }
public void createControls(int style) { GridData gridData; Text textFld, subjectFld; Control toLabel, ccLabel, bccLabel; Control fromDateTime; Control control; Button durationText; Button submit; GridLayout layout = new GridLayout(2, false); layout.marginWidth = 0; layout.marginHeight = 4; setLayout(layout); //Label gridData = new GridData(GridData.HORIZONTAL_ALIGN_FILL | GridData.VERTICAL_ALIGN_CENTER); gridData.horizontalIndent = 10; LabelFactory.create(this, Messages.getString("ExampleEditLayout.Title"), gridData); //$NON-NLS-1$ gridData = new GridData(GridData.HORIZONTAL_ALIGN_FILL | GridData.VERTICAL_ALIGN_CENTER); gridData.horizontalIndent = 40; LabelFactory.create(this, "", gridData); //Text gridData = new GridData(GridData.HORIZONTAL_ALIGN_FILL | GridData.VERTICAL_ALIGN_CENTER); gridData.horizontalIndent = 10; control = LabelFactory.create(this, Messages.getString("ExampleEditLayout.Email"), gridData); //$NON-NLS-1$ gridData = new GridData(GridData.HORIZONTAL_ALIGN_BEGINNING | GridData.VERTICAL_ALIGN_CENTER); gridData.horizontalIndent = 10; control = TextFactory.create(this, SWT.BORDER | SWT.V_SCROLL | SWT.WRAP, gridData, FieldMode.Edit); //$NON-NLS-1$ addField(new TextField(control, ExampleViewContentProvider.FIRST_INDEX)); //Combo gridData = new GridData(GridData.HORIZONTAL_ALIGN_FILL | GridData.VERTICAL_ALIGN_CENTER); gridData.horizontalIndent = 10; LabelFactory.create(this, Messages.getString("ExampleEditLayout.Group"), gridData); //$NON-NLS-1$ gridData = new GridData(GridData.HORIZONTAL_ALIGN_BEGINNING | GridData.VERTICAL_ALIGN_CENTER); gridData.horizontalIndent = 40; control = ComboFactory.create(this, FieldMode.Edit, false, gridData); //$NON-NLS-1$ addField(new ComboField(control, ExampleViewContentProvider.SECOND_INDEX)); ...}
public class TextField extends Field { /** * @param control * @param id */ public TextField(Control control, int id) { super(control, id); } /* Based on the ID of the widget, values retrieved from * the content provider are set. */ public void readFromContent(IExampleContentProvider content) { String newText = (String )content.getElement(getId()); if (newText != null) ((Text )_control).setText(newText); } /* Based on the ID of the widget, values retrieved from widget are * sent back to the content provider. */ public void writeToContent(IExampleContentProvider content) { String newText = ((Text )_control).getText(); content.setElement(getId(), newText); } }
public Object getElement(int iIndex) { switch (iIndex) { case FIRST_INDEX: return "developer@ibm.com"; case SECOND_INDEX : return new Integer(1); case FOURTH_INDEX : return new Boolean(true); case THIRD_INDEX: return new Boolean(false); case FIFTH_INDEX: return new Boolean(false); } return null; }
public Form (Composite parent, int style, FieldMode mode, ExampleViewContentProvider content) { super(parent, style); _content = content; _style = style; setMode(mode); init(style); } private void init(int style) { createControls(style); controlsCreated(); } protected void controlsCreated() { readFromContent(); }