[GEF] 키보드 방향키로 크기/위치 제어하기

방향키로 크기와 위치를 제어해보려고 여러 사이트를 뒤져보았으나, 속 시원한 레퍼런스를 찾기 어려워서... 그냥 마구잡이로 만들었습니다. GEF 구조를 더 잘 알았으면 EditPolicy 도 이용했을텐데... 아직 거기까지 레벨은 안되서...


GEF 는 커맨드 단위로 변경을 처리합니다. 키보드 처리를 위해서는 별도의 Command 클래스를 생성합니다.

ArrowKeyChangeLayoutCommand.java

import java.util.List; import org.eclipse.gef.commands.Command; import com.idstrust.wiseone.formwizard.edit.ElementPart; import com.idstrust.wiseone.formwizard.models.ChildElement; public class ArrowKeyChangeLayoutCommand extends Command { private List selectedEditPartList; private Integer differenceWidthOrX; private Integer differenceHeightOrY; private boolean bTranslate = true; private boolean bChanged; public ArrowKeyChangeLayoutCommand(List selectedEditPartList, Integer differenceWidthOrX, Integer differenceHeightOrY) { super(); this.selectedEditPartList = selectedEditPartList; this.differenceWidthOrX = differenceWidthOrX; this.differenceHeightOrY = differenceHeightOrY; } public ArrowKeyChangeLayoutCommand(List selectedEditPartList, Integer differenceWidthOrX, Integer differenceHeightOrY, boolean bTranslate) { this(selectedEditPartList, differenceWidthOrX, differenceHeightOrY); this.bTranslate = bTranslate; } @Override public boolean canExecute() { return selectedEditPartList != null && differenceWidthOrX != null && differenceHeightOrY != null; } @Override public void execute() { changeLayout(); } /** * 레이아웃을 변경합니다. */ private void changeLayout() { changeLayout(false); } /** * 레이아웃을 변경합니다. * @param bUndo */ private void changeLayout(boolean bUndo) { for (Object selectedObject : selectedEditPartList) { if (selectedObject instanceof ElementPart) { ElementPart elementPart = (ElementPart) selectedObject; Object model = elementPart.getModel(); if (model instanceof ChildElement) { ChildElement childElement = (ChildElement) model; int wx = bUndo ? -differenceWidthOrX : differenceWidthOrX; int hy = bUndo ? -differenceHeightOrY : differenceHeightOrY; if (bTranslate) { childElement.setLayout(childElement.getLayout().getTranslated(wx, hy)); } else { childElement.setLayout(childElement.getLayout().getResized(wx, hy)); } } } } bChanged = !bUndo; } @Override public void redo() { changeLayout(); } @Override public boolean canUndo() { return bChanged; } @Override public void undo() { changeLayout(true); } }


키보드 입력을 처리하는 GraphicalViewerKeyHandler 를 상속받아 Command 를 생성하는 별도의 KeyHandler 클래스를 생성합니다.

FormWizardArrowKeyHandler.java
import java.util.List; import org.eclipse.gef.GraphicalViewer; import org.eclipse.gef.commands.Command; import org.eclipse.gef.commands.CommandStack; import org.eclipse.gef.ui.parts.GraphicalViewerKeyHandler; import org.eclipse.jface.viewers.ISelection; import org.eclipse.jface.viewers.ISelectionProvider; import org.eclipse.jface.viewers.StructuredSelection; import org.eclipse.swt.SWT; import org.eclipse.swt.events.KeyEvent; import com.idstrust.wiseone.formwizard.commands.ArrowKeyChangeLayoutCommand; public class FormWizardArrowKeyHandler extends GraphicalViewerKeyHandler { private ISelectionProvider selectionProvider; private CommandStack commandStack; public FormWizardArrowKeyHandler(GraphicalViewer viewer, ISelectionProvider selectionProvider, CommandStack commandStack) { super(viewer); setSelectionProvider(selectionProvider); setCommandStack(commandStack); } public void setSelectionProvider(ISelectionProvider selectionProvider) { this.selectionProvider = selectionProvider; } public void setCommandStack(CommandStack commandStack) { this.commandStack = commandStack; } @Override public boolean keyPressed(KeyEvent event) { if (selectionProvider != null && (event.keyCode == SWT.ARROW_UP || event.keyCode == SWT.ARROW_DOWN || event.keyCode == SWT.ARROW_LEFT || event.keyCode == SWT.ARROW_RIGHT)) { ISelection selection = selectionProvider.getSelection(); if (selection instanceof StructuredSelection) { StructuredSelection structuredSelection = (StructuredSelection) selection; commandStack.execute(createChangeLayoutCommand(structuredSelection.toList(), event)); } return false; } return super.keyPressed(event); } /** * 이벤트에 따라 새로운 Command 객체를 생성합니다. * * @param selectedEditPartList * @param event * @return */ private Command createChangeLayoutCommand(List selectedEditPartList, KeyEvent event) { int differenceWidthOrX = 0; int differenceHeightOrY = 0; switch (event.keyCode) { case SWT.ARROW_UP: differenceHeightOrY = -1; break; case SWT.ARROW_DOWN: differenceHeightOrY = 1; break; case SWT.ARROW_LEFT: differenceWidthOrX = -1; break; case SWT.ARROW_RIGHT: differenceWidthOrX = 1; break; } Command command = new ArrowKeyChangeLayoutCommand(selectedEditPartList, differenceWidthOrX, differenceHeightOrY, event.stateMask != SWT.SHIFT); return command; } }



GraphicalEditor 를 초기화 하는 부분에 아래와 같이 설정합니다.

GraphicalViewer viewer = getGraphicalViewer();
viewer.setKeyHandler(new FormWizardArrowKeyHandler(viewer, getSite().getSelectionProvider(), getCommandStack()));

GraphicalViewer 에서 Figure 를 선택하고 방향키를 누르면 위치가 이동되며, SHIFT 키를 누르고 방향키를 누르면 크기가 조절됩니다.

예전부터 묵혀두었던 문제를 처리...