X backend conforms to new API

backends/x/window.go

@@ -8,6 +8,8 @@ import "github.com/jezek/xgbutil/xevent"
 import "github.com/jezek/xgbutil/xwindow"
 import "github.com/jezek/xgbutil/xgraphics"
 import "git.tebibyte.media/sashakoshka/tomo/input"
+import "git.tebibyte.media/sashakoshka/tomo/theme"
+import "git.tebibyte.media/sashakoshka/tomo/config"
 import "git.tebibyte.media/sashakoshka/tomo/canvas"
 import "git.tebibyte.media/sashakoshka/tomo/elements"
 
@@ -20,6 +22,9 @@ type Window struct {
 	onClose func ()
 	skipChildDrawCallback bool
 
+	theme  theme.Theme
+	config config.Config
+
 	metrics struct {
 		width  int
 		height int
@@ -69,6 +74,9 @@ func (backend *Backend) NewWindow (
 		Connect(backend.connection, window.xWindow.Id)
 	xevent.MotionNotifyFun(window.handleMotionNotify).
 		Connect(backend.connection, window.xWindow.Id)
+
+	window.SetTheme(backend.theme)
+	window.SetConfig(backend.config)
 	
 	window.metrics.width  = width
 	window.metrics.height = height
@@ -100,6 +108,12 @@ func (window *Window) Adopt (child elements.Element) {
 	
 	// adopt new child
 	window.child = child
+	if newChild, ok := child.(elements.Themeable); ok {
+		newChild.SetTheme(window.theme)
+	}
+	if newChild, ok := child.(elements.Configurable); ok {
+		newChild.SetConfig(window.config)
+	}
 	if newChild, ok := child.(elements.Flexible); ok {
 		newChild.OnFlexibleHeightChange(window.resizeChildToFit)
 	}
@@ -196,6 +210,20 @@ func (window *Window) OnClose (callback func ()) {
 	window.onClose = callback
 }
 
+func (window *Window) SetTheme (theme theme.Theme) {
+	window.theme = theme
+	if child, ok := window.child.(elements.Themeable); ok {
+		child.SetTheme(theme)
+	}
+}
+
+func (window *Window) SetConfig (config config.Config) {
+	window.config = config
+	if child, ok := window.child.(elements.Configurable); ok {
+		child.SetConfig(config)
+	}
+}
+
 func (window *Window) reallocateCanvas () {
 	window.canvas.Reallocate(window.metrics.width, window.metrics.height)
 

backends/x/x.go

@@ -2,6 +2,8 @@ package x
 
 import "git.tebibyte.media/sashakoshka/tomo"
 import "git.tebibyte.media/sashakoshka/tomo/data"
+import "git.tebibyte.media/sashakoshka/tomo/theme"
+import "git.tebibyte.media/sashakoshka/tomo/config"
 
 import "github.com/jezek/xgbutil"
 import "github.com/jezek/xgb/xproto"
@@ -25,6 +27,9 @@ type Backend struct {
 		hyper uint16
 	}
 
+	theme  theme.Theme
+	config config.Config
+
 	windows map[xproto.Window] *Window
 }
 
@@ -95,6 +100,25 @@ func (backend *Backend) Paste (accept []data.Mime) (data data.Data) {
 	return
 }
 
+
+// SetTheme sets the theme of all open windows.
+func (backend *Backend) SetTheme (theme theme.Theme) {
+	backend.assert()
+	backend.theme = theme
+	for _, window := range backend.windows {
+		window.SetTheme(theme)
+	}
+}
+
+// SetConfig sets the configuration of all open windows.
+func (backend *Backend) SetConfig (config config.Config) {
+	backend.assert()
+	backend.config = config
+	for _, window := range backend.windows {
+		window.SetConfig(config)
+	}
+} 
+
 func (backend *Backend) assert () {
 	if backend == nil { panic("nil backend") }
 }

elements/element.go

@@ -164,6 +164,8 @@ type Scrollable interface {
 // Themeable represents an element that can modify its appearance to fit within
 // a theme.
 type Themeable interface {
+	Element
+	
 	// SetTheme sets the element's theme to something fulfilling the
 	// theme.Theme interface.
 	SetTheme (theme.Theme)
@@ -172,6 +174,8 @@ type Themeable interface {
 // Configurable represents an element that can modify its behavior to fit within
 // a set of configuration parameters.
 type Configurable interface {
+	Element
+	
 	// SetConfig sets the element's configuration to something fulfilling
 	// the config.Config interface.
 	SetConfig (config.Config)