From bdf599f93cbf37ca6ec572458bdaa361ee0e5eda Mon Sep 17 00:00:00 2001
From: Sasha Koshka <sashakoshka@tebibyte.media>
Date: Fri, 3 Feb 2023 01:25:45 -0500
Subject: [PATCH] Backends must now accept Config and Theme

---
 backend.go          |  8 ++++++++
 elements/element.go |  3 ++-
 tomo.go             | 28 ++++++++++++++++++++--------
 3 files changed, 30 insertions(+), 9 deletions(-)

diff --git a/backend.go b/backend.go
index 3b1ff31..a22e1ec 100644
--- a/backend.go
+++ b/backend.go
@@ -2,6 +2,8 @@ package tomo
 
 import "errors"
 import "git.tebibyte.media/sashakoshka/tomo/data"
+import "git.tebibyte.media/sashakoshka/tomo/theme"
+import "git.tebibyte.media/sashakoshka/tomo/config"
 import "git.tebibyte.media/sashakoshka/tomo/elements"
 
 // Backend represents a connection to a display server, or something similar.
@@ -28,6 +30,12 @@ type Backend interface {
 
 	// Paste returns the data currently in the clipboard.
 	Paste (accept []data.Mime) (data.Data)
+	
+	// SetTheme sets the theme of all open windows.
+	SetTheme (theme.Theme)
+	
+	// SetConfig sets the configuration of all open windows.
+	SetConfig (config.Config)
 }
 
 // BackendFactory represents a function capable of constructing a backend
diff --git a/elements/element.go b/elements/element.go
index 3743aa4..30022ee 100644
--- a/elements/element.go
+++ b/elements/element.go
@@ -39,7 +39,8 @@ type Element interface {
 type Focusable interface {
 	Element
 
-	// Focused returns whether or not this element is currently focused.
+	// Focused returns whether or not this element or any of its children
+	// are currently focused.
 	Focused () (selected bool)
 
 	// Focus focuses this element, if its parent element grants the
diff --git a/tomo.go b/tomo.go
index b1416b0..ac0a87e 100644
--- a/tomo.go
+++ b/tomo.go
@@ -1,7 +1,8 @@
 package tomo
 
-import "errors"
 import "git.tebibyte.media/sashakoshka/tomo/data"
+import "git.tebibyte.media/sashakoshka/tomo/theme"
+import "git.tebibyte.media/sashakoshka/tomo/config"
 import "git.tebibyte.media/sashakoshka/tomo/elements"
 
 var backend Backend
@@ -26,7 +27,7 @@ func Stop () {
 // Do executes the specified callback within the main thread as soon as
 // possible. This function can be safely called from other threads.
 func Do (callback func ()) {
-	if backend == nil { panic("no backend is running") }
+	assertBackend()
 	backend.Do(callback)
 }
 
@@ -35,22 +36,33 @@ func Do (callback func ()) {
 // why. If this function is called without a running backend, an error is
 // returned as well.
 func NewWindow (width, height int) (window elements.Window, err error) {
-	if backend == nil {
-		err = errors.New("no backend is running.")
-		return
-	}
+	assertBackend()
 	return backend.NewWindow(width, height)
 }
 
 // Copy puts data into the clipboard.
 func Copy (data data.Data) {
-	if backend == nil { panic("no backend is running") }
+	assertBackend()
 	backend.Copy(data)
 }
 
 // Paste returns the data currently in the clipboard. This method may
 // return nil.
 func Paste (accept []data.Mime) (data.Data) {
-	if backend == nil { panic("no backend is running") }
+	assertBackend()
 	return backend.Paste(accept)
 }
+
+// SetTheme sets the theme of all open windows.
+func SetTheme (theme theme.Theme) {
+	backend.SetTheme(theme)
+}
+
+// SetConfig sets the configuration of all open windows.
+func SetConfig (config config.Config) {
+	backend.SetConfig(config)
+}
+
+func assertBackend () {
+	if backend == nil { panic("no backend is running") }
+}