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Modify drag handler for easier subclassing. Thanks for the team effort on this one (closes #827).

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git-svn-id: http://svn.openlayers.org/trunk/openlayers@4096 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
This commit is contained in:
Tim Schaub
2007-08-29 03:11:41 +00:00
parent 30982c20b3
commit 984cdf6672
2 changed files with 117 additions and 6 deletions
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66
lib/OpenLayers/Handler/Drag.js
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@@ -76,6 +76,56 @@ OpenLayers.Handler.Drag = OpenLayers.Class(OpenLayers.Handler, {
OpenLayers.Handler.prototype.initialize.apply(this, arguments);
},
/**
* The four methods below (down, move, up, and out) are used by subclasses
* to do their own processing related to these mouse events.
*/
/**
* Method: down
* This method is called during the handling of the mouse down event.
* Subclasses can do their own processing here.
*
* Parameters:
* evt - {Event} The mouse down event
*/
down: function(evt) {
},
/**
* Method: move
* This method is called during the handling of the mouse move event.
* Subclasses can do their own processing here.
*
* Parameters:
* evt - {Event} The mouse move event
*
*/
move: function(evt) {
},
/**
* Method: up
* This method is called during the handling of the mouse up event.
* Subclasses can do their own processing here.
*
* Parameters:
* evt - {Event} The mouse up event
*/
up: function(evt) {
},
/**
* Method: out
* This method is called during the handling of the mouse out event.
* Subclasses can do their own processing here.
*
* Parameters:
* evt - {Event} The mouse out event
*/
out: function(evt) {
},
/**
* The methods below are part of the magic of event handling. Because
* they are named like browser events, they are registered as listeners
@@ -100,6 +150,7 @@ OpenLayers.Handler.Drag = OpenLayers.Class(OpenLayers.Handler, {
this.last = evt.xy;
// TBD replace with CSS classes
this.map.div.style.cursor = "move";
this.down(evt);
this.callback("down", [evt.xy]);
OpenLayers.Event.stop(evt);
return false;
@@ -121,6 +172,7 @@ OpenLayers.Handler.Drag = OpenLayers.Class(OpenLayers.Handler, {
if (this.started) {
if(evt.xy.x != this.last.x || evt.xy.y != this.last.y) {
this.dragging = true;
this.move(evt);
this.callback("move", [evt.xy]);
if(!this.oldOnselectstart) {
this.oldOnselectstart = document.onselectstart;
@@ -148,6 +200,7 @@ OpenLayers.Handler.Drag = OpenLayers.Class(OpenLayers.Handler, {
this.dragging = false;
// TBD replace with CSS classes
this.map.div.style.cursor = "";
this.up(evt);
this.callback("up", [evt.xy]);
this.callback("done", [evt.xy]);
document.onselectstart = this.oldOnselectstart;
@@ -171,6 +224,7 @@ OpenLayers.Handler.Drag = OpenLayers.Class(OpenLayers.Handler, {
this.dragging = false;
// TBD replace with CSS classes
this.map.div.style.cursor = "";
this.out(evt);
this.callback("out", []);
if(document.onselectstart) {
document.onselectstart = this.oldOnselectstart;
@@ -210,12 +264,12 @@ OpenLayers.Handler.Drag = OpenLayers.Class(OpenLayers.Handler, {
* {Boolean} The handler was successfully activated.
*/
activate: function() {
var activated = false;
if(OpenLayers.Handler.prototype.activate.apply(this, arguments)) {
this.dragging = false;
return true;
} else {
return false;
activated = true;
}
return activated;
},
/**
@@ -226,12 +280,12 @@ OpenLayers.Handler.Drag = OpenLayers.Class(OpenLayers.Handler, {
* {Boolean} The handler was successfully deactivated.
*/
deactivate: function() {
var deactivated = false;
if(OpenLayers.Handler.prototype.deactivate.apply(this, arguments)) {
this.dragging = false;
return true;
} else {
return false;
deactivated = true;
}
return deactivated;
},
CLASS_NAME: "OpenLayers.Handler.Drag"