common tree package for toolkitsv0.12.4

    This update provides *lots* of toolkit updates. This will allow
        the next step of debugging the gocui toolkit to make it work
        again. There are new common routines for handling the plugin
        channel communication

Signed-off-by: Jeff Carr <[email protected]>

1 files changed, 50 insertions, 0 deletions

diff --git a/tree/plugin.go b/tree/plugin.go
new file mode 100644
index 0000000..d7468e4
--- /dev/null
+++ b/tree/plugin.go
@@ -0,0 +1,50 @@
+package tree
+
+/*
+	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 (
+	"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
+}
+
+// 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 (me *TreeInfo) Callback(guiCallback chan widget.Action) {
+	me.callback = guiCallback
+}
+
+func (me *TreeInfo) PluginChannel() chan widget.Action {
+	return me.pluginChan
+}