Add a web browser tab.

src/View.zig

@@ -1,5 +1,5 @@
-//! A view: the content of one tab, holding one or more terminal panes
-//! arranged in a split tree.
+//! A view: the content of one tab, holding one or more panes — terminals, web
+//! views, or a mix — arranged in a split tree.
 //!
 //! Dragging a pane rearranges the view live rather than on release. Each time
 //! the drop target changes, the move is applied for real, so what you see
@@ -18,6 +18,7 @@ const Terminal = @import("Terminal.zig");
 const View = @This();
 
 pub const Side = Layout.Side;
+pub const Kind = Pane.Kind;
 
 /// Where a dragged pane would land.
 pub const Target = struct {
@@ -113,8 +114,8 @@ pub fn widget(self: *View) *gtk.Widget {
     return self.box.as(gtk.Widget);
 }
 
-/// Text for the tab label: the focused terminal's title, prefixed with the
-/// pane count once there is more than one.
+/// Text for the tab label: the focused pane's title, prefixed with the pane
+/// count once there is more than one.
 pub fn label(self: *View, buf: []u8) []const u8 {
     const pane = self.focusedPane() orelse return "";
     const title = pane.titleSlice();
@@ -132,19 +133,27 @@ pub fn focusedPane(self: *View) ?*Pane {
     return self.focused orelse (if (self.panes.items.len > 0) self.panes.items[0] else null);
 }
 
+/// The focused pane's terminal, or null when the focused pane holds a web
+/// view instead.
 pub fn focusedTerminal(self: *View) ?*Terminal {
     const pane = self.focusedPane() orelse return null;
-    return pane.term;
+    return pane.terminal();
+}
+
+/// Icon for the tab row: whatever the focused pane is showing.
+pub fn iconName(self: *View) [:0]const u8 {
+    const pane = self.focusedPane() orelse return Kind.terminal.iconName();
+    return pane.kind.iconName();
 }
 
 pub fn focus(self: *View) void {
     if (self.focusedPane()) |pane| pane.grabFocus();
 }
 
-/// Add a terminal, splitting the focused pane so the new one appears beside
-/// the terminal you were working in.
-pub fn addPane(self: *View) !void {
-    const pane = try Pane.create(self.alloc, self);
+/// Add a pane, splitting the focused one so the new pane appears beside
+/// whatever you were working in.
+pub fn addPane(self: *View, kind: Kind) !void {
+    const pane = try Pane.create(self.alloc, self, kind);
     errdefer pane.destroy();
 
     const node = try self.layout.newLeaf(pane);