Добавлены остальные инструменты

src/Toolbar.zig

@@ -9,12 +9,12 @@ pub const ToolDescriptor = struct {
 };
 
 tools: []const ToolDescriptor,
-selected_index: usize,
+selected_index: ?usize,
 
 pub fn init(tools_list: []const ToolDescriptor) Toolbar {
     return .{
         .tools = tools_list,
-        .selected_index = 0,
+        .selected_index = null,
     };
 }
 
@@ -22,9 +22,22 @@ pub fn deinit(_: *Toolbar) void {}
 
 pub fn currentDescriptor(self: *const Toolbar) ?*const ToolDescriptor {
     if (self.tools.len == 0) return null;
-    return &self.tools[self.selected_index];
+    if (self.selected_index) |index| {
+        return &self.tools[index];
+    }
+    return null;
 }
 
-pub fn select(self: *Toolbar, index: usize) void {
-    if (index < self.tools.len) self.selected_index = index;
+pub fn select(self: *Toolbar, index: ?usize) void {
+    if (index == self.selected_index) {
+        self.selected_index = null;
+        return;
+    }
+    if (index) |i| {
+        if (i < self.tools.len) {
+            self.selected_index = i;
+        }
+    } else {
+        self.selected_index = null;
+    }
 }