1 files changed, 166 insertions, 0 deletions
diff --git a/nocui/common.go b/nocui/common.go
new file mode 100644
index 0000000..a8d9684
--- /dev/null
+++ b/nocui/common.go
@@ -0,0 +1,166 @@
+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 (
+	"go.wit.com/gui/gui/toolkit"
+)
+
+// this is the channel we send user events like
+// mouse clicks or keyboard events back to the program
+var callback chan toolkit.Action
+
+// this is the channel we get requests to make widgets
+var pluginChan chan toolkit.Action
+
+type node struct {
+	parent	*node
+	children []*node
+
+	WidgetId	int	// widget ID
+	WidgetType	toolkit.WidgetType
+	ParentId	int	// parent ID
+
+	Name   string
+	Text   string
+
+	// This is how the values are passed back and forth
+	// values from things like checkboxes & dropdown's
+	B	bool
+	I	int
+	S	string
+
+	A	any // switch to this or deprecate this? pros/cons?
+
+	// This is used for things like a slider(0,100)
+	X      int
+	Y      int
+
+	// This is for the grid size & widget position
+	W      int
+	H      int
+	AtW    int
+	AtH    int
+
+	vals []string // dropdown menu items
+
+	// horizontal=true  means layout widgets like books on a bookshelf
+	// horizontal=false means layout widgets like books in a stack
+	horizontal bool `default:false`
+
+	hasTabs bool // does the window have tabs?
+	currentTab bool // the visible tab
+
+	// the internal plugin toolkit structure
+	// in the gtk plugin, it has gtk things like margin & border settings
+	// in the text console one, it has text console things like colors for menus & buttons
+	tk *guiWidget
+}
+
+// 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(logError, "doUserEvent() callback == nil", n.WidgetId)
+		return
+	}
+	var a toolkit.Action
+	a.WidgetId = n.WidgetId
+	a.Name = n.Name
+	a.Text = n.Text
+	a.S = n.S
+	a.I = n.I
+	a.B = n.B
+	a.ActionType = toolkit.User
+	log(logInfo, "doUserEvent() START: send a user event to the callback channel")
+	callback <- a
+	log(logInfo, "doUserEvent() END:   sent a user event to the callback channel")
+	return
+}
+
+func addNode(a *toolkit.Action) *node {
+	n := new(node)
+	n.WidgetType = a.WidgetType
+	n.WidgetId = a.WidgetId
+	n.ParentId = a.ParentId
+
+	// copy the data from the action message
+	n.Name = a.Name
+	n.Text = a.Text
+	n.I = a.I
+	n.S = a.S
+	n.B = a.B
+
+	n.X = a.X
+	n.Y = a.Y
+
+	n.W = a.W
+	n.H = a.H
+	n.AtW = a.AtW
+	n.AtH = a.AtH
+
+	// store the internal toolkit information
+	n.tk = initWidget(n)
+	// n.tk = new(guiWidget)
+
+	if (a.WidgetType == toolkit.Root) {
+		log(logInfo, "addNode() Root")
+		return n
+	}
+
+	if (me.rootNode.findWidgetId(a.WidgetId) != nil) {
+		log(logError, "addNode() WidgetId already exists", a.WidgetId)
+		return me.rootNode.findWidgetId(a.WidgetId)
+	}
+
+	// add this new widget on the binary tree
+	n.parent = me.rootNode.findWidgetId(a.ParentId)
+	if n.parent != nil {
+		n.parent.children = append(n.parent.children, n)
+		//w := n.tk
+		//w.parent = n.parent.tk
+		//w.parent.children = append(w.parent.children, w)
+	}
+	return n
+}
+
+// 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 toolkit.Action) {
+	callback = guiCallback
+}
+
+func PluginChannel() chan toolkit.Action {
+	return pluginChan
+}