Added a way to set WM_CLASS

backends/x/window.go

@@ -25,6 +25,8 @@ type window struct {
 	onClose func ()
 	skipChildDrawCallback bool
 
+	title, application string
+
 	modalParent *window
 	hasModal    bool
 
@@ -182,6 +184,7 @@ func (window *window) Child () (child tomo.Element) {
 }
 
 func (window *window) SetTitle (title string) {
+	window.title = title
 	ewmh.WmNameSet (
 		window.backend.connection,
 		window.xWindow.Id,
@@ -196,6 +199,17 @@ func (window *window) SetTitle (title string) {
 		title)
 }
 
+func (window *window) SetApplicationName (name string) {
+	window.application = name
+	icccm.WmClassSet (
+		window.backend.connection,
+		window.xWindow.Id,
+		&icccm.WmClass {
+			Instance: name,
+			Class:    name,
+		})
+}
+
 func (window *window) SetIcon (sizes []image.Image) {
 	wmIcons := []ewmh.WmIcon { }
 	
@@ -247,6 +261,7 @@ func (window *window) NewModal (width, height int) (tomo.Window, error) {
 		[]string { "_NET_WM_STATE_MODAL" })
 	modal.modalParent = window
 	window.hasModal   = true
+	modal.inheritProperties(window)
 	return modal, err
 }
 
@@ -260,9 +275,14 @@ func (window mainWindow) NewPanel (width, height int) (tomo.Window, error) {
 		panel.xWindow.Id,
 		window.xWindow.Id)
 	panel.setType("UTILITY")
+	panel.inheritProperties(window.window)
 	return panel, err
 }
 
+func (window *window) inheritProperties (parent *window) {
+	window.SetApplicationName(parent.application)
+}
+
 func (window *window) setType (ty string) error {
 	return ewmh.WmWindowTypeSet (
 		window.backend.connection,

window.go

@@ -18,13 +18,19 @@ type Window interface {
 	// method might have no effect with some backends.
 	SetTitle (string)
 
+	// SetApplicationName sets the name of the application that this window
+	// belongs to. This method might have no effect with some backends.
+	SetApplicationName (string)
+
 	// SetIcon taks in a list different sizes of the same icon and selects
 	// the best one to display on the window title bar, dock, or whatever is
 	// applicable for the given backend. This method might have no effect
 	// for some backends.
 	SetIcon (sizes []image.Image)
 
-	// NewModal creates a new modal dialog window.
+	// NewModal creates a new modal dialog window. The resulting window will
+	// inherit this window's application name and icon, but these can be
+	// manually overridden.
 	NewModal (width, height int) (window Window, err error)
 	
 	// Copy puts data into the clipboard.
@@ -56,6 +62,7 @@ type MainWindow interface {
 
 	// NewPanel creates a panel window that is semantically tied to this
 	// window. This is intended to be used for utility windows, tool bars,
-	// torn-off menus, etc.
+	// torn-off menus, etc. The resulting window will inherit this window's
+	// application name and icon, but these can be manually overridden.
 	NewPanel (width, height int) (window Window, err error)
 }