wisemapping-open-source/mindplot/src/main/javascript/DragManager.js
2011-01-23 21:03:40 -03:00

164 lines
5.0 KiB
JavaScript

/*
* Copyright [2011] [wisemapping]
*
* Licensed under WiseMapping Public License, Version 1.0 (the "License").
* It is basically the Apache License, Version 2.0 (the "License") plus the
* "powered by wisemapping" text requirement on every single page;
* you may not use this file except in compliance with the License.
* You may obtain a copy of the license at
*
* http://www.wisemapping.org/license
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
mindplot.DragManager = function(workspace)
{
this._workspace = workspace;
this._listeners = {};
var dragManager = this;
};
mindplot.DragManager.prototype.add = function(node)
{
// Add behaviour ...
var workspace = this._workspace;
var screen = workspace.getScreenManager();
var dragManager = this;
var mouseDownListener = function(event)
{
if (workspace.isWorkspaceEventsEnabled())
{
// Disable double drag...
workspace.enableWorkspaceEvents(false);
// Set initial position.
var dragNode = node.createDragNode();
var mousePos = screen.getWorkspaceMousePosition(event);
dragNode.setPosition(mousePos.x, mousePos.y);
// Register mouse move listener ...
var mouseMoveListener = dragManager._buildMouseMoveListener(workspace, dragNode, dragManager);
screen.addEventListener('mousemove', mouseMoveListener);
// Register mouse up listeners ...
var mouseUpListener = dragManager._buildMouseUpListener(workspace, node, dragNode, dragManager);
screen.addEventListener('mouseup', mouseUpListener);
// Execute Listeners ..
var startDragListener = dragManager._listeners['startdragging'];
startDragListener(event, node);
// Change cursor.
window.document.body.style.cursor = 'move';
}
};
dragManager._mouseMoveListener = mouseDownListener;
node.addEventListener('mousedown', mouseDownListener);
};
mindplot.DragManager.prototype.remove = function(node)
{
var nodes = this._topics;
var contained = false;
var index = -1;
for (var i = 0; i < nodes.length; i++) {
if (nodes[i] == node) {
contained = true;
index = i;
}
}
if (contained)
{
elem = new Array();
}
};
mindplot.DragManager.prototype._buildMouseMoveListener = function(workspace, dragNode, dragManager)
{
var screen = workspace.getScreenManager();
var result = function(event) {
if (!dragNode._isInTheWorkspace)
{
// Add shadow node to the workspace.
workspace.appendChild(dragNode);
dragNode._isInTheWorkspace = true;
}
var pos = screen.getWorkspaceMousePosition(event);
dragNode.setPosition(pos.x, pos.y);
// Call mouse move listeners ...
var dragListener = dragManager._listeners['dragging'];
if (dragListener)
{
dragListener(event, dragNode);
}
event.preventDefault();
}.bindWithEvent(this);
dragManager._mouseMoveListener = result;
return result;
};
mindplot.DragManager.prototype._buildMouseUpListener = function(workspace, node, dragNode, dragManager)
{
var screen = workspace.getScreenManager();
var result = function(event) {
core.assert(dragNode.isDragTopic, 'dragNode must be an DragTopic');
// Remove drag node from the workspace.
var hasBeenDragged = dragNode._isInTheWorkspace;
if (dragNode._isInTheWorkspace)
{
dragNode.removeFromWorkspace(workspace);
}
// Remove all the events.
screen.removeEventListener('mousemove', dragManager._mouseMoveListener);
screen.removeEventListener('mouseup', dragManager._mouseUpListener);
// Help GC
dragManager._mouseMoveListener = null;
dragManager._mouseUpListener = null;
// Execute Listeners only if the node has been moved.
var endDragListener = dragManager._listeners['enddragging'];
endDragListener(event, dragNode);
if (hasBeenDragged)
{
dragNode._isInTheWorkspace = false;
}
// Change the cursor to the default.
window.document.body.style.cursor = 'default';
workspace.enableWorkspaceEvents(true);
};
dragManager._mouseUpListener = result;
return result;
};
/**
* type:
* - startdragging.
* - dragging
* - enddragging
*/
mindplot.DragManager.prototype. addEventListener = function(type, listener)
{
this._listeners[type] = listener;
};
mindplot.DragManager.DRAG_PRECISION_IN_SEG = 100;