Current File : /home/tjamichg/cursos.tjamich.gob.mx/main/inc/lib/mxgraph/src/js/handler/mxPanningHandler.js
/**
* Copyright (c) 2006-2015, JGraph Ltd
* Copyright (c) 2006-2015, Gaudenz Alder
*/
/**
* Class: mxPanningHandler
*
* Event handler that pans and creates popupmenus. To use the left
* mousebutton for panning without interfering with cell moving and
* resizing, use <isUseLeftButton> and <isIgnoreCell>. For grid size
* steps while panning, use <useGrid>. This handler is built-into
* <mxGraph.panningHandler> and enabled using <mxGraph.setPanning>.
*
* Constructor: mxPanningHandler
*
* Constructs an event handler that creates a <mxPopupMenu>
* and pans the graph.
*
* Event: mxEvent.PAN_START
*
* Fires when the panning handler changes its <active> state to true. The
* <code>event</code> property contains the corresponding <mxMouseEvent>.
*
* Event: mxEvent.PAN
*
* Fires while handle is processing events. The <code>event</code> property contains
* the corresponding <mxMouseEvent>.
*
* Event: mxEvent.PAN_END
*
* Fires when the panning handler changes its <active> state to false. The
* <code>event</code> property contains the corresponding <mxMouseEvent>.
*/
function mxPanningHandler(graph)
{
if (graph != null)
{
this.graph = graph;
this.graph.addMouseListener(this);
// Handles force panning event
this.forcePanningHandler = mxUtils.bind(this, function(sender, evt)
{
var evtName = evt.getProperty('eventName');
var me = evt.getProperty('event');
if (evtName == mxEvent.MOUSE_DOWN && this.isForcePanningEvent(me))
{
this.start(me);
this.active = true;
this.fireEvent(new mxEventObject(mxEvent.PAN_START, 'event', me));
me.consume();
}
});
this.graph.addListener(mxEvent.FIRE_MOUSE_EVENT, this.forcePanningHandler);
// Handles pinch gestures
this.gestureHandler = mxUtils.bind(this, function(sender, eo)
{
if (this.isPinchEnabled())
{
var evt = eo.getProperty('event');
if (!mxEvent.isConsumed(evt) && evt.type == 'gesturestart')
{
this.initialScale = this.graph.view.scale;
// Forces start of panning when pinch gesture starts
if (!this.active && this.mouseDownEvent != null)
{
this.start(this.mouseDownEvent);
this.mouseDownEvent = null;
}
}
else if (evt.type == 'gestureend' && this.initialScale != null)
{
this.initialScale = null;
}
if (this.initialScale != null)
{
var value = Math.round(this.initialScale * evt.scale * 100) / 100;
if (this.minScale != null)
{
value = Math.max(this.minScale, value);
}
if (this.maxScale != null)
{
value = Math.min(this.maxScale, value);
}
if (this.graph.view.scale != value)
{
this.graph.zoomTo(value);
mxEvent.consume(evt);
}
}
}
});
this.graph.addListener(mxEvent.GESTURE, this.gestureHandler);
this.mouseUpListener = mxUtils.bind(this, function()
{
if (this.active)
{
this.reset();
}
});
// Stops scrolling on every mouseup anywhere in the document
mxEvent.addListener(document, 'mouseup', this.mouseUpListener);
}
};
/**
* Extends mxEventSource.
*/
mxPanningHandler.prototype = new mxEventSource();
mxPanningHandler.prototype.constructor = mxPanningHandler;
/**
* Variable: graph
*
* Reference to the enclosing <mxGraph>.
*/
mxPanningHandler.prototype.graph = null;
/**
* Variable: useLeftButtonForPanning
*
* Specifies if panning should be active for the left mouse button.
* Setting this to true may conflict with <mxRubberband>. Default is false.
*/
mxPanningHandler.prototype.useLeftButtonForPanning = false;
/**
* Variable: usePopupTrigger
*
* Specifies if <mxEvent.isPopupTrigger> should also be used for panning.
*/
mxPanningHandler.prototype.usePopupTrigger = true;
/**
* Variable: ignoreCell
*
* Specifies if panning should be active even if there is a cell under the
* mousepointer. Default is false.
*/
mxPanningHandler.prototype.ignoreCell = false;
/**
* Variable: previewEnabled
*
* Specifies if the panning should be previewed. Default is true.
*/
mxPanningHandler.prototype.previewEnabled = true;
/**
* Variable: useGrid
*
* Specifies if the panning steps should be aligned to the grid size.
* Default is false.
*/
mxPanningHandler.prototype.useGrid = false;
/**
* Variable: panningEnabled
*
* Specifies if panning should be enabled. Default is true.
*/
mxPanningHandler.prototype.panningEnabled = true;
/**
* Variable: pinchEnabled
*
* Specifies if pinch gestures should be handled as zoom. Default is true.
*/
mxPanningHandler.prototype.pinchEnabled = true;
/**
* Variable: maxScale
*
* Specifies the maximum scale. Default is 8.
*/
mxPanningHandler.prototype.maxScale = 8;
/**
* Variable: minScale
*
* Specifies the minimum scale. Default is 0.01.
*/
mxPanningHandler.prototype.minScale = 0.01;
/**
* Variable: dx
*
* Holds the current horizontal offset.
*/
mxPanningHandler.prototype.dx = null;
/**
* Variable: dy
*
* Holds the current vertical offset.
*/
mxPanningHandler.prototype.dy = null;
/**
* Variable: startX
*
* Holds the x-coordinate of the start point.
*/
mxPanningHandler.prototype.startX = 0;
/**
* Variable: startY
*
* Holds the y-coordinate of the start point.
*/
mxPanningHandler.prototype.startY = 0;
/**
* Function: isActive
*
* Returns true if the handler is currently active.
*/
mxPanningHandler.prototype.isActive = function()
{
return this.active || this.initialScale != null;
};
/**
* Function: isPanningEnabled
*
* Returns <panningEnabled>.
*/
mxPanningHandler.prototype.isPanningEnabled = function()
{
return this.panningEnabled;
};
/**
* Function: setPanningEnabled
*
* Sets <panningEnabled>.
*/
mxPanningHandler.prototype.setPanningEnabled = function(value)
{
this.panningEnabled = value;
};
/**
* Function: isPinchEnabled
*
* Returns <pinchEnabled>.
*/
mxPanningHandler.prototype.isPinchEnabled = function()
{
return this.pinchEnabled;
};
/**
* Function: setPinchEnabled
*
* Sets <pinchEnabled>.
*/
mxPanningHandler.prototype.setPinchEnabled = function(value)
{
this.pinchEnabled = value;
};
/**
* Function: isPanningTrigger
*
* Returns true if the given event is a panning trigger for the optional
* given cell. This returns true if control-shift is pressed or if
* <usePopupTrigger> is true and the event is a popup trigger.
*/
mxPanningHandler.prototype.isPanningTrigger = function(me)
{
var evt = me.getEvent();
return (this.useLeftButtonForPanning && me.getState() == null &&
mxEvent.isLeftMouseButton(evt)) || (mxEvent.isControlDown(evt) &&
mxEvent.isShiftDown(evt)) || (this.usePopupTrigger && mxEvent.isPopupTrigger(evt));
};
/**
* Function: isForcePanningEvent
*
* Returns true if the given <mxMouseEvent> should start panning. This
* implementation always returns true if <ignoreCell> is true or for
* multi touch events.
*/
mxPanningHandler.prototype.isForcePanningEvent = function(me)
{
return this.ignoreCell || mxEvent.isMultiTouchEvent(me.getEvent());
};
/**
* Function: mouseDown
*
* Handles the event by initiating the panning. By consuming the event all
* subsequent events of the gesture are redirected to this handler.
*/
mxPanningHandler.prototype.mouseDown = function(sender, me)
{
this.mouseDownEvent = me;
if (!me.isConsumed() && this.isPanningEnabled() && !this.active && this.isPanningTrigger(me))
{
this.start(me);
this.consumePanningTrigger(me);
}
};
/**
* Function: start
*
* Starts panning at the given event.
*/
mxPanningHandler.prototype.start = function(me)
{
this.dx0 = -this.graph.container.scrollLeft;
this.dy0 = -this.graph.container.scrollTop;
// Stores the location of the trigger event
this.startX = me.getX();
this.startY = me.getY();
this.dx = null;
this.dy = null;
this.panningTrigger = true;
};
/**
* Function: consumePanningTrigger
*
* Consumes the given <mxMouseEvent> if it was a panning trigger in
* <mouseDown>. The default is to invoke <mxMouseEvent.consume>. Note that this
* will block any further event processing. If you haven't disabled built-in
* context menus and require immediate selection of the cell on mouseDown in
* Safari and/or on the Mac, then use the following code:
*
* (code)
* mxPanningHandler.prototype.consumePanningTrigger = function(me)
* {
* if (me.evt.preventDefault)
* {
* me.evt.preventDefault();
* }
*
* // Stops event processing in IE
* me.evt.returnValue = false;
*
* // Sets local consumed state
* if (!mxClient.IS_SF && !mxClient.IS_MAC)
* {
* me.consumed = true;
* }
* };
* (end)
*/
mxPanningHandler.prototype.consumePanningTrigger = function(me)
{
me.consume();
};
/**
* Function: mouseMove
*
* Handles the event by updating the panning on the graph.
*/
mxPanningHandler.prototype.mouseMove = function(sender, me)
{
this.dx = me.getX() - this.startX;
this.dy = me.getY() - this.startY;
if (this.active)
{
if (this.previewEnabled)
{
// Applies the grid to the panning steps
if (this.useGrid)
{
this.dx = this.graph.snap(this.dx);
this.dy = this.graph.snap(this.dy);
}
this.graph.panGraph(this.dx + this.dx0, this.dy + this.dy0);
}
this.fireEvent(new mxEventObject(mxEvent.PAN, 'event', me));
}
else if (this.panningTrigger)
{
var tmp = this.active;
// Panning is activated only if the mouse is moved
// beyond the graph tolerance
this.active = Math.abs(this.dx) > this.graph.tolerance || Math.abs(this.dy) > this.graph.tolerance;
if (!tmp && this.active)
{
this.fireEvent(new mxEventObject(mxEvent.PAN_START, 'event', me));
}
}
if (this.active || this.panningTrigger)
{
me.consume();
}
};
/**
* Function: mouseUp
*
* Handles the event by setting the translation on the view or showing the
* popupmenu.
*/
mxPanningHandler.prototype.mouseUp = function(sender, me)
{
if (this.active)
{
if (this.dx != null && this.dy != null)
{
// Ignores if scrollbars have been used for panning
if (!this.graph.useScrollbarsForPanning || !mxUtils.hasScrollbars(this.graph.container))
{
var scale = this.graph.getView().scale;
var t = this.graph.getView().translate;
this.graph.panGraph(0, 0);
this.panGraph(t.x + this.dx / scale, t.y + this.dy / scale);
}
me.consume();
}
this.fireEvent(new mxEventObject(mxEvent.PAN_END, 'event', me));
}
this.reset();
};
/**
* Function: mouseUp
*
* Handles the event by setting the translation on the view or showing the
* popupmenu.
*/
mxPanningHandler.prototype.reset = function()
{
this.panningTrigger = false;
this.mouseDownEvent = null;
this.active = false;
this.dx = null;
this.dy = null;
};
/**
* Function: panGraph
*
* Pans <graph> by the given amount.
*/
mxPanningHandler.prototype.panGraph = function(dx, dy)
{
this.graph.getView().setTranslate(dx, dy);
};
/**
* Function: destroy
*
* Destroys the handler and all its resources and DOM nodes.
*/
mxPanningHandler.prototype.destroy = function()
{
this.graph.removeMouseListener(this);
this.graph.removeListener(this.forcePanningHandler);
this.graph.removeListener(this.gestureHandler);
mxEvent.removeListener(document, 'mouseup', this.mouseUpListener);
};
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