mxgraph示例解析(-) menustyle右键菜单

menustyle右键菜单效果图

官方示例

<style type="text/css">
body div.mxPopupMenu {
    -webkit-box-shadow: 3px 3px 6px #C0C0C0;
    -moz-box-shadow: 3px 3px 6px #C0C0C0;
    box-shadow: 3px 3px 6px #C0C0C0;
    background: white;
    position: absolute;
    border: 3px solid #e7e7e7;
    padding: 3px;
}
body table.mxPopupMenu {
    border-collapse: collapse;
    margin: 0px;
}
body tr.mxPopupMenuItem {
    color: black;
    cursor: default;
}
body td.mxPopupMenuItem {
    padding: 6px 60px 6px 30px;
    font-family: Arial;
    font-size: 10pt;
}
body td.mxPopupMenuIcon {
    background-color: white;
    padding: 0px;
}
body tr.mxPopupMenuItemHover {
    background-color: #eeeeee;
    color: black;
}
table.mxPopupMenu hr {
    border-top: solid 1px #cccccc;
}
table.mxPopupMenu tr {
    font-size: 4pt;
}
</style>

<script type="text/javascript">
// Disables built-in context menu
mxEvent.disableContextMenu(document.body);

// Changes some default colors
mxConstants.HANDLE_FILLCOLOR = '#99ccff';
mxConstants.HANDLE_STROKECOLOR = '#0088cf';
mxConstants.VERTEX_SELECTION_COLOR = '#00a8ff';

// Creates the graph inside the given container
var graph = new mxGraph(container);
graph.setTooltips(true);

// Enables rubberband selection
new mxRubberband(graph);

// Gets the default parent for inserting new cells. This
// is normally the first child of the root (ie. layer 0).
var parent = graph.getDefaultParent();
                
// Adds cells to the model in a single step
graph.getModel().beginUpdate();
try
{
    var v1 = graph.insertVertex(parent, null, 'Hello,', 20, 20, 80, 30);
    var v2 = graph.insertVertex(parent, null, 'World!', 200, 150, 80, 30);
    var e1 = graph.insertEdge(parent, null, '', v1, v2);
}
finally
{
    // Updates the display
    graph.getModel().endUpdate();
}

// Creates a new overlay with an image and a tooltip and makes it "transparent" to events
var overlay = new mxCellOverlay(new mxImage('editors/images/overlays/check.png', 16, 16), 'Overlay tooltip');

var mxCellRendererInstallCellOverlayListeners = mxCellRenderer.prototype.installCellOverlayListeners;
mxCellRenderer.prototype.installCellOverlayListeners = function(state, overlay, shape)
{
    mxCellRendererInstallCellOverlayListeners.apply(this, arguments);
    var graph  = state.view.graph;

    mxEvent.addGestureListeners(shape.node,
        function (evt)
        {
            graph.fireMouseEvent(mxEvent.MOUSE_DOWN, new mxMouseEvent(evt, state));
        },
        function (evt)
        {
            graph.fireMouseEvent(mxEvent.MOUSE_MOVE, new mxMouseEvent(evt, state));
        },
        function (evt)
        {
            if (mxClient.IS_QUIRKS)
            {
                graph.fireMouseEvent(mxEvent.MOUSE_UP, new mxMouseEvent(evt, state));
            }
        });
    
    if (!mxClient.IS_TOUCH)
    {
        mxEvent.addListener(shape.node, 'mouseup', function (evt)
        {
            overlay.fireEvent(new mxEventObject(mxEvent.CLICK,
                    'event', evt, 'cell', state.cell));
        });
    }
};

// Sets the overlay for the cell in the graph
graph.addCellOverlay(v1, overlay);

// Configures automatic expand on mouseover
graph.popupMenuHandler.autoExpand = true;

// Installs context menu
graph.popupMenuHandler.factoryMethod = function(menu, cell, evt)
{
    menu.addItem('Item 1', null, function()
    {
        alert('Item 1');
    });
    
    menu.addItem('Item 2', null, function()
    {
        alert('Item 2');
    });

    menu.addSeparator();
    
    var submenu1 = menu.addItem('Submenu 1', null, null);
    
    menu.addItem('Subitem 1', null, function()
    {
        alert('Subitem 1');
    }, submenu1);
    menu.addItem('Subitem 1', null, function()
    {
        alert('Subitem 2');
    }, submenu1);
};
</script>

实现原理

• 禁用右键菜单

mxEvent.disableContextMenu(document.body);

• 创建右键菜单

// Configures automatic expand on mouseover
graph.popupMenuHandler.autoExpand = true;

// Installs context menu
graph.popupMenuHandler.factoryMethod = function(menu, cell, evt)
{
    menu.addItem('Item 1', null, function()
    {
        alert('Item 1');
    });
    
    menu.addItem('Item 2', null, function()
    {
        alert('Item 2');
    });

    menu.addSeparator();
    
    var submenu1 = menu.addItem('Submenu 1', null, null);
    
    menu.addItem('Subitem 1', null, function()
    {
        alert('Subitem 1');
    }, submenu1);
    menu.addItem('Subitem 1', null, function()
    {
        alert('Subitem 2');
    }, submenu1);
};

简化示例

// Configures automatic expand on mouseover
graph.popupMenuHandler.autoExpand = true;

// Installs context menu
graph.popupMenuHandler.factoryMethod = function(menu, cell, evt)
{
    menu.addItem('Item 1', null, function()
    {
        alert('Item 1');
    });
    
    menu.addItem('Item 2', null, function()
    {
        alert('Item 2');
    });

    menu.addSeparator();
    
    var submenu1 = menu.addItem('Submenu 1', null, null);
    
    menu.addItem('Subitem 1', null, function()
    {
        alert('Subitem 1');
    }, submenu1);
    menu.addItem('Subitem 1', null, function()
    {
        alert('Subitem 2');
    }, submenu1);
};