* * Needs-More-Work: this mode has more responsibility than just making * selections, it has become the "main mode" of the editor and it has * taken resposibility for switching to other modes. I shuold probably * implement a "UIDialog" class that would have a state machine that * describes the various transitions between UI modes.
* * Needs-More-Work: There is currently a bug in shift clicking, you * cannot unselect an individual item by shift-clicking on it.
* * FEATURE: editing_modes_select * * @see ModeCreateArc * @see ModeModify * @see DiagramElement * @see Editor */ public class ModeSelect extends Mode { //////////////////////////////////////////////////////////////// // instance variables /** If the user drags a selection rectangle, this is the first corner. */ private Point selectAnchor = new Point(0, 0); /** This is the seclection rectangle. */ private Rectangle selectRect = new Rectangle(0,0,0,0); /** True when the selection rectangle should be drawn. */ private boolean showSelectRect = false; /** True when the user holds the shift key to toggle selections. */ private boolean toggleSelection = false; //////////////////////////////////////////////////////////////// // constructors and related methods /** Construct a new ModeSelect with the given parent. */ public ModeSelect(Editor par) { super(par); } /** Construct a new ModeSelect instance. Its parent must be set * before this instance can be used. */ public ModeSelect() { } /** Always false because I never want to get out of selection mode. */ public boolean canExit() { return false; } //////////////////////////////////////////////////////////////// // event handlers /** Handle mouse down events by preparing for a drag. If the mouse * down event happens on a handle or an already selected object, and * the shift key is not down, then go to ModeModify. If the mouse * down event happens on a port, to to ModeCreateArc. * * FEATURE: select_by_click * * FEATURE: select_none * * BUG: shift_click */ public boolean mouseDown(Event e, int x, int y) { /* If multiple things are selected and the user clicked one of them. */ selectAnchor = new Point(x, y); selectRect.reshape(x, y, 0, 0); toggleSelection = e.shiftDown(); DiagramElement underMouse = parent.pick(selectAnchor); if (underMouse == null) return true; if (!parent.selection().contains(underMouse)) { if (toggleSelection) parent.toggleItem(underMouse); else parent.selectItem(underMouse); } else if (toggleSelection) parent.toggleItem(underMouse); Selection sel = parent.selection(); if (sel.inside(selectAnchor)) { gotoModifyMode(e, x, y); return true; } return true; } /** On mouse dragging, modify the selection rectangle. * * FEATURE: select_by_area */ public boolean mouseDrag(Event e, int x, int y) { showSelectRect = true; int bound_x = Math.min(selectAnchor.x, x); int bound_y = Math.min(selectAnchor.y, y); int bound_w = Math.max(selectAnchor.x, x) - bound_x; int bound_h = Math.max(selectAnchor.y, y) - bound_y; parent.damaged(selectRect); selectRect.reshape(bound_x, bound_y, bound_w, bound_h); parent.damaged(selectRect); return true; } /** On mouse up, select or toggle the selection of items under the * mouse or in the selection rectangle. */ public boolean mouseUp(Event e,int x,int y) { showSelectRect = false; Vector selectList = new Vector(); Enumeration eles = parent.view().contents().elements(); while (eles.hasMoreElements()) { DiagramElement de = (DiagramElement) eles.nextElement(); if ((selectRect.isEmpty() && de.inside(selectRect.x, selectRect.y)) || (!selectRect.isEmpty() && de.intersects(selectRect))) { selectList.addElement(de); } } if (toggleSelection) parent.toggleItems(selectList); else parent.selectItems(selectList); selectRect.grow(1,1); /* make sure it is not empty for redraw */ parent.damaged(selectRect); return true; } //////////////////////////////////////////////////////////////// // drawing methods /** Draw this mode by drawing the selection rectangle if appropriate. */ public void draw(Graphics g) { if (showSelectRect) { Color selectRectColor = (Color) Globals.prefs().rubberbandAttrs().get("LineColor"); g.setColor(selectRectColor); g.drawRect(selectRect.x, selectRect.y, selectRect.width, selectRect.height); } } //////////////////////////////////////////////////////////////// // methods related to transitions among modes /** Set the Editor's Mode to ModeModify. Needs-More-Work: This * should not be in ModeSelect, I wanted to move it to ModeStack, * but it is too tighly integrated with ModeSelect. */ protected void gotoModifyMode(Event e, int x, int y) { Mode nextMode = new ModeModify(parent); parent.mode(nextMode); nextMode.mouseDown(e, x, y); } } /* end class ModeSelect */