/**
* $Id: mxCellHandler.java,v 1.1 2012/11/15 13:26:44 gaudenz Exp $
* Copyright (c) 2008-2012, JGraph Ltd
*/
package com.mxgraph.swing.handler;
import java.awt.Color;
import java.awt.Cursor;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.Stroke;
import java.awt.event.MouseEvent;
import javax.swing.JComponent;
import com.mxgraph.swing.mxGraphComponent;
import com.mxgraph.swing.util.mxSwingConstants;
import com.mxgraph.util.mxRectangle;
import com.mxgraph.view.mxCellState;
import com.mxgraph.view.mxGraph;
/**
* @author Administrator
*
*/
public class mxCellHandler
{
/**
* Reference to the enclosing graph component.
*/
protected mxGraphComponent graphComponent;
/**
* Holds the cell state associated with this handler.
*/
protected mxCellState state;
/**
* Holds the rectangles that define the handles.
*/
protected Rectangle[] handles;
/**
* Specifies if the handles should be painted. Default is true.
*/
protected boolean handlesVisible = true;
/**
* Holds the bounding box of the handler.
*/
protected transient Rectangle bounds;
/**
* Holds the component that is used for preview.
*/
protected transient JComponent preview;
/**
* Holds the start location of the mouse gesture.
*/
protected transient Point first;
/**
* Holds the index of the handle that was clicked.
*/
protected transient int index;
/**
* Constructs a new cell handler for the given cell state.
*
* @param graphComponent Enclosing graph component.
* @param state Cell state for which the handler is created.
*/
public mxCellHandler(mxGraphComponent graphComponent, mxCellState state)
{
this.graphComponent = graphComponent;
refresh(state);
}
/**
*
*/
public boolean isActive()
{
return first != null;
}
/**
* Refreshes the cell handler.
*/
public void refresh(mxCellState state)
{
this.state = state;
handles = createHandles();
mxGraph graph = graphComponent.getGraph();
mxRectangle tmp = graph.getBoundingBox(state.getCell());
if (tmp != null)
{
bounds = tmp.getRectangle();
if (handles != null)
{
for (int i = 0; i < handles.length; i++)
{
if (isHandleVisible(i))
{
bounds.add(handles[i]);
}
}
}
}
}
/**
*
*/
public mxGraphComponent getGraphComponent()
{
return graphComponent;
}
/**
* Returns the cell state that is associated with this handler.
*/
public mxCellState getState()
{
return state;
}
/**
* Returns the index of the current handle.
*/
public int getIndex()
{
return index;
}
/**
* Returns the bounding box of this handler.
*/
public Rectangle getBounds()
{
return bounds;
}
/**
* Returns true if the label is movable.
*/
public boolean isLabelMovable()
{
mxGraph graph = graphComponent.getGraph();
String label = graph.getLabel(state.getCell());
return graph.isLabelMovable(state.getCell()) && label != null
&& label.length() > 0;
}
/**
* Returns true if the handles should be painted.
*/
public boolean isHandlesVisible()
{
return handlesVisible;
}
/**
* Specifies if the handles should be painted.
*/
public void setHandlesVisible(boolean handlesVisible)
{
this.handlesVisible = handlesVisible;
}
/**
* Returns true if the given index is the index of the last handle.
*/
public boolean isLabel(int index)
{
return index == getHandleCount() - 1;
}
/**
* Creates the rectangles that define the handles.
*/
protected Rectangle[] createHandles()
{
return null;
}
/**
* Returns the number of handles in this handler.
*/
protected int getHandleCount()
{
return (handles != null) ? handles.length : 0;
}
/**
* Hook for subclassers to return tooltip texts for certain points on the
* handle.
*/
public String getToolTipText(MouseEvent e)
{
return null;
}
/**
* Returns the index of the handle at the given location.
*
* @param x X-coordinate of the location.
* @param y Y-coordinate of the location.
* @return Returns the handle index for the given location.
*/
public int getIndexAt(int x, int y)
{
if (handles != null && isHandlesVisible())
{
int tol = graphComponent.getTolerance();
Rectangle rect = new Rectangle(x - tol / 2, y - tol / 2, tol, tol);
for (int i = handles.length - 1; i >= 0; i--)
{
if (isHandleVisible(i) && handles[i].intersects(rect))
{
return i;
}
}
}
return -1;
}
/**
* Processes the given event.
*/
public void mousePressed(MouseEvent e)
{
if (!e.isConsumed())
{
int tmp = getIndexAt(e.getX(), e.getY());
if (!isIgnoredEvent(e) && tmp >= 0 && isHandleEnabled(tmp))
{
graphComponent.stopEditing(true);
start(e, tmp);
e.consume();
}
}
}
/**
* Processes the given event.
*/
public void mouseMoved(MouseEvent e)
{
if (!e.isConsumed() && handles != null)
{
int index = getIndexAt(e.getX(), e.getY());
if (index >= 0 && isHandleEnabled(index))
{
Cursor cursor = getCursor(e, index);
if (cursor != null)
{
graphComponent.getGraphControl().setCursor(cursor);
e.consume();
}
else
{
graphComponent.getGraphControl().setCursor(
new Cursor(Cursor.HAND_CURSOR));
}
}
}
}
/**
* Processes the given event.
*/
public void mouseDragged(MouseEvent e)
{
// empty
}
/**
* Processes the given event.
*/
public void mouseReleased(MouseEvent e)
{
reset();
}
/**
* Starts handling a gesture at the given handle index.
*/
public void start(MouseEvent e, int index)
{
this.index = index;
first = e.getPoint();
preview = createPreview();
if (preview != null)
{
graphComponent.getGraphControl().add(preview, 0);
}
}
/**
* Returns true if the given event should be ignored.
*/
protected boolean isIgnoredEvent(MouseEvent e)
{
return graphComponent.isEditEvent(e);
}
/**
* Creates the preview for this handler.
*/
protected JComponent createPreview()
{
return null;
}
/**
* Resets the state of the handler and removes the preview.
*/
public void reset()
{
if (preview != null)
{
preview.setVisible(false);
preview.getParent().remove(preview);
preview = null;
}
first = null;
}
/**
* Returns the cursor for the given event and handle.
*/
protected Cursor getCursor(MouseEvent e, int index)
{
return null;
}
/**
* Paints the visible handles of this handler.
*/
public void paint(Graphics g)
{
if (handles != null && isHandlesVisible())
{
for (int i = 0; i < handles.length; i++)
{
if (isHandleVisible(i)
&& g.hitClip(handles[i].x, handles[i].y,
handles[i].width, handles[i].height))
{
g.setColor(getHandleFillColor(i));
g.fillRect(handles[i].x, handles[i].y, handles[i].width,
handles[i].height);
g.setColor(getHandleBorderColor(i));
g.drawRect(handles[i].x, handles[i].y,
handles[i].width - 1, handles[i].height - 1);
}
}
}
}
/**
* Returns the color used to draw the selection border. This implementation
* returns null.
*/
public Color getSelectionColor()
{
return null;
}
/**
* Returns the stroke used to draw the selection border. This implementation
* returns null.
*/
public Stroke getSelectionStroke()
{
return null;
}
/**
* Returns true if the handle at the specified index is enabled.
*/
protected boolean isHandleEnabled(int index)
{
return true;
}
/**
* Returns true if the handle at the specified index is visible.
*/
protected boolean isHandleVisible(int index)
{
return !isLabel(index) || isLabelMovable();
}
/**
* Returns the color to be used to fill the handle at the specified index.
*/
protected Color getHandleFillColor(int index)
{
if (isLabel(index))
{
return mxSwingConstants.LABEL_HANDLE_FILLCOLOR;
}
return mxSwingConstants.HANDLE_FILLCOLOR;
}
/**
* Returns the border color of the handle at the specified index.
*/
protected Color getHandleBorderColor(int index)
{
return mxSwingConstants.HANDLE_BORDERCOLOR;
}
/**
* Invoked when the handler is no longer used. This is an empty
* hook for subclassers.
*/
protected void destroy()
{
// nop
}
}