1 files changed, 69 insertions, 0 deletions
diff --git a/common/plugin.go b/common/plugin.go
new file mode 100644
index 0000000..bfc9a68
--- /dev/null
+++ b/common/plugin.go
@@ -0,0 +1,69 @@
+package main
+
+/*
+	These code should be common to all gui plugins
+
+	There are some helper functions that are probably going to be
+	the same everywhere. Mostly due to handling the binary tree structure
+	and the channel communication
+
+	For now, it's just a symlink to the 'master' version in
+	./toolkit/nocui/common.go
+*/
+
+import (
+	"reflect"
+	"strconv"
+
+	"go.wit.com/log"
+	"go.wit.com/gui/widget"
+)
+
+// searches the binary tree for a WidgetId
+func (n *node) findWidgetId(id int) *node {
+	if (n == nil) {
+		return nil
+	}
+
+	if n.WidgetId == id {
+		return n
+	}
+
+	for _, child := range n.children {
+		newN := child.findWidgetId(id)
+		if (newN != nil) {
+			return newN
+		}
+	}
+	return nil
+}
+
+func (n *node) doUserEvent() {
+	if (callback == nil) {
+		log.Log(ERROR, "doUserEvent() callback == nil", n.WidgetId)
+		return
+	}
+	var a widget.Action
+	a.WidgetId = n.WidgetId
+	a.Value = n.value
+	a.ActionType = widget.User
+	log.Log(INFO, "doUserEvent() START: send a user event to the callback channel")
+	callback <- a
+	log.Log(INFO, "doUserEvent() END:   sent a user event to the callback channel")
+	return
+}
+
+// Other goroutines must use this to access the GUI
+//
+// You can not acess / process the GUI thread directly from
+// other goroutines. This is due to the nature of how
+// Linux, MacOS and Windows work (they all work differently. suprise. surprise.)
+//
+// this sets the channel to send user events back from the plugin
+func Callback(guiCallback chan widget.Action) {
+	callback = guiCallback
+}
+
+func PluginChannel() chan widget.Action {
+	return pluginChan
+}