[pve-devel] [PATCH widget-toolkit v4 4/4] rrdchart: add dummy listener for legend clicks

[Aaron Lauterer <a.lauterer@proxmox.com>]

This way we can define a listener when needed to react to any clicks in
the legend. Usually enabling/disabling some data series.

The event was nowhere documented, but by using the following snippet,
right where we add the listener, it can be observed to happen.

```
Ext.mixin.Observable.capture(this, function(evname) {console.log(evname, arguments);})
```
This would be `me.legend` in that scenario.

Signed-off-by: Aaron Lauterer <a.lauterer@proxmox.com>
---
 src/panel/RRDChart.js | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/panel/RRDChart.js b/src/panel/RRDChart.js
index 7f0b923..c81e2e7 100644
--- a/src/panel/RRDChart.js
+++ b/src/panel/RRDChart.js
@@ -67,6 +67,8 @@ Ext.define('Proxmox.widget.RRDChart', {
     // set to empty string to suppress warning in debug mode
     downloadServerUrl: '-',
 
+    onLegendChange: Ext.emptyFn, // empty dummy function so we can add listener for legend events when needed
+
     controller: {
         xclass: 'Ext.app.ViewController',
 
@@ -261,6 +263,8 @@ Ext.define('Proxmox.widget.RRDChart', {
         me.updateHeader();
 
         if (me.header && me.legend) {
+            // event itemclick is not documented for legend, but found it by printing all events happening
+            me.legend.addListener('itemclick', me.onLegendChange);
             me.header.padding = '4 9 4';
             me.header.add(me.legend);
             me.legend = undefined;
-- 
2.39.5



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