diff --git a/lua/ow/dap/hover/node.lua b/lua/ow/dap/hover/node.lua
index 1e93ca7..d2c976c 100644
--- a/lua/ow/dap/hover/node.lua
+++ b/lua/ow/dap/hover/node.lua
@@ -26,6 +26,20 @@ function Node:is_container()
         or false
 end
 
+---@return boolean
+function Node:is_c_pointer()
+    return self:is_container()
+        and self.item.type:match(
+                "%*%s*[const%s]*[volatile%s]*[restrict%s]*$"
+            )
+            ~= nil
+end
+
+---@return boolean
+function Node:is_c_null_pointer()
+    return self:is_c_pointer() and self.item.value:match("^0[xX]0*$") ~= nil
+end
+
 ---@return string
 function Node:get_tree_prefix()
     if not self.parent then
@@ -60,11 +74,7 @@ end
 
 ---@return boolean
 function Node:is_c_pointer_child()
-    return self.parent
-            and self.parent.item.type:match(
-                "%*%s*[const%s]*[volatile%s]*[restrict%s]*$"
-            ) ~= nil
-        or false
+    return self.parent ~= nil and self.parent:is_c_pointer()
 end
 
 ---@return string
@@ -90,6 +100,39 @@ function Node:format_c()
     )
 end
 
+---@return string
+function Node:get_full_expression()
+    local parts = {}
+    local current = self
+
+    while current do
+        table.insert(parts, 1, current.item.name)
+        current = current.parent
+    end
+
+    if #parts <= 1 then
+        return parts[1] or ""
+    end
+
+    local expr = parts[1]
+    for i = 2, #parts do
+        local part = parts[i]
+        if part:match("^%[.*%]$") then
+            expr = expr .. part
+        elseif part:match("^%*") then
+            expr = "(" .. expr .. ")" .. part
+        else
+            if expr:match("%*$") then
+                expr = expr .. part
+            else
+                expr = expr .. "." .. part
+            end
+        end
+    end
+
+    return expr
+end
+
 ---@param session dap.Session
 ---@param content ow.dap.hover.Content
 function Node:format_into(session, content)
diff --git a/lua/ow/dap/hover/tree.lua b/lua/ow/dap/hover/tree.lua
index d4beb3a..6ea37a5 100644
--- a/lua/ow/dap/hover/tree.lua
+++ b/lua/ow/dap/hover/tree.lua
@@ -130,6 +130,34 @@ function Tree:get_node_at_line(target_line)
     end
 end
 
+---@param target_node ow.dap.hover.Node
+---@return integer?
+function Tree:get_line_for_node(target_node)
+    local current_line = 0
+
+    ---@param node ow.dap.hover.Node
+    local function search(node)
+        current_line = current_line + 1
+        if node == target_node then
+            return current_line
+        end
+
+        if node.is_expanded and node.children then
+            for _, child in ipairs(node.children) do
+                local found = search(child)
+                if found then
+                    return found
+                end
+            end
+        end
+        return nil
+    end
+
+    if self.root then
+        return search(self.root)
+    end
+end
+
 ---@async
 ---@param node ow.dap.hover.Node
 ---@return boolean success
@@ -145,4 +173,45 @@ function Tree:toggle_node(node)
     return true
 end
 
+---@async
+---@param node ow.dap.hover.Node
+---@return boolean success
+function Tree:expand_all_children(node)
+    if not node:is_container() then
+        return true
+    end
+
+    if
+        (self.session.filetype == "c" or self.session.filetype == "cpp")
+        and node:is_c_null_pointer()
+    then
+        return true
+    end
+
+    if not node.is_expanded then
+        local success = self:load_children(node)
+        if not success then
+            return false
+        end
+        node.is_expanded = true
+    end
+
+    for _, child in ipairs(node.children) do
+        local success = self:expand_all_children(child)
+        if not success then
+            return false
+        end
+    end
+
+    return true
+end
+
+---@param node ow.dap.hover.Node
+function Tree:collapse_all_children(node)
+    node.is_expanded = false
+    for _, child in ipairs(node.children) do
+        self:collapse_all_children(child)
+    end
+end
+
 return Tree
diff --git a/lua/ow/dap/hover/window.lua b/lua/ow/dap/hover/window.lua
index a46e5c0..2689ad2 100644
--- a/lua/ow/dap/hover/window.lua
+++ b/lua/ow/dap/hover/window.lua
@@ -1,6 +1,30 @@
 local Content = require("ow.dap.hover.content")
 local log = require("ow.log")
 
+---@class ow.dap.hover.NodeInfo
+---@field node ow.dap.hover.Node?
+---@field line_number integer
+---@field subtree_count integer
+local NodeInfo = {}
+NodeInfo.__index = NodeInfo
+
+---@param node ow.dap.hover.Node?
+---@param line_number integer
+---@param subtree_count integer
+---@return ow.dap.hover.NodeInfo
+function NodeInfo.new(node, line_number, subtree_count)
+    return setmetatable({
+        node = node,
+        line_number = line_number,
+        subtree_count = subtree_count,
+    }, NodeInfo)
+end
+
+---@return boolean
+function NodeInfo:is_valid()
+    return self.node ~= nil
+end
+
 ---@class ow.dap.hover.Window
 ---@field NAMESPACE string
 ---@field max_width? integer
@@ -121,12 +145,58 @@ function Window:show(content)
         end,
     })
 
+    -- Toggle expand/collapse
     vim.keymap.set("n", "<CR>", function()
-        self:expand_at_cursor()
+        self:toggle_node()
     end, { buffer = self.bufnr, nowait = true })
 
     vim.keymap.set("n", "<Tab>", function()
-        self:expand_at_cursor()
+        self:toggle_node()
+    end, { buffer = self.bufnr, nowait = true })
+
+    vim.keymap.set("n", "<Space>", function()
+        self:toggle_node()
+    end, { buffer = self.bufnr, nowait = true })
+
+    -- Collapse
+    vim.keymap.set("n", "<S-Tab>", function()
+        self:collapse_parent()
+    end, { buffer = self.bufnr, nowait = true })
+
+    vim.keymap.set("n", "<BS>", function()
+        self:collapse_parent()
+    end, { buffer = self.bufnr, nowait = true })
+
+    -- Tree operations
+    vim.keymap.set("n", "E", function()
+        self:expand_all_at_cursor()
+    end, { buffer = self.bufnr, nowait = true })
+
+    vim.keymap.set("n", "C", function()
+        self:collapse_all_at_cursor()
+    end, { buffer = self.bufnr, nowait = true })
+
+    -- Navigation
+    vim.keymap.set("n", "p", function()
+        self:goto_parent()
+    end, { buffer = self.bufnr, nowait = true })
+
+    -- Quick actions
+    vim.keymap.set("n", "q", function()
+        self:close()
+    end, { buffer = self.bufnr, nowait = true })
+
+    vim.keymap.set("n", "<Esc>", function()
+        self:close()
+    end, { buffer = self.bufnr, nowait = true })
+
+    -- Yank operations
+    vim.keymap.set("n", "y", function()
+        self:yank_value()
+    end, { buffer = self.bufnr, nowait = true })
+
+    vim.keymap.set("n", "Y", function()
+        self:yank_expression()
     end, { buffer = self.bufnr, nowait = true })
 end
 
@@ -140,48 +210,70 @@ function Window:update_buffer(callback)
     vim.wo[self.winid].scrolloff = prev_scrolloff
 end
 
-function Window:expand_at_cursor()
+---@return ow.dap.hover.NodeInfo
+function Window:get_current_node_info()
+    local lnum = vim.api.nvim_win_get_cursor(self.winid)[1]
+    local node = self.tree:get_node_at_line(lnum)
+
+    if not node then
+        return NodeInfo.new(nil, lnum, 0)
+    end
+
+    local subtree_count = self.tree:count_subtree_nodes(node)
+    return NodeInfo.new(node, lnum, subtree_count)
+end
+
+---@async
+---@param node ow.dap.hover.Node
+---@param start_line integer 1-indexed line number
+---@param line_count integer number of lines to replace
+function Window:refresh_subtree(node, start_line, line_count)
+    local content = Content.new()
+    self.tree:render_subtree(node, content)
+    local lines = content:get_lines()
+
+    self:update_buffer(function()
+        vim.api.nvim_buf_set_lines(
+            self.bufnr,
+            start_line - 1,
+            start_line - 1 + line_count,
+            true,
+            lines
+        )
+    end)
+
+    content:apply_highlights(Window.NS_ID, self.bufnr, start_line - 1)
+
+    vim.api.nvim_win_set_config(self.winid, {
+        width = self:compute_width(),
+    })
+    vim.api.nvim_win_set_config(self.winid, {
+        height = self:compute_height(),
+    })
+end
+
+function Window:toggle_node()
     if not self.tree then
         return
     end
 
     coroutine.wrap(function()
         local ok, err = xpcall(function()
-            local lnum = vim.api.nvim_win_get_cursor(self.winid)[1]
-            local node = self.tree:get_node_at_line(lnum)
-            if not node or not node:is_container() then
+            local info = self:get_current_node_info()
+            if not info:is_valid() or not info.node:is_container() then
                 return
             end
 
-            local prev_node_count = self.tree:count_subtree_nodes(node)
-
-            local success = self.tree:toggle_node(node)
+            local success = self.tree:toggle_node(info.node)
             if not success then
                 return
             end
 
-            local content = Content.new()
-            self.tree:render_subtree(node, content)
-            local lines = content:get_lines()
-
-            self:update_buffer(function()
-                vim.api.nvim_buf_set_lines(
-                    self.bufnr,
-                    lnum - 1,
-                    lnum - 1 + prev_node_count,
-                    true,
-                    lines
-                )
-            end)
-
-            content:apply_highlights(Window.NS_ID, self.bufnr, lnum - 1)
-
-            vim.api.nvim_win_set_config(self.winid, {
-                width = self:compute_width(),
-            })
-            vim.api.nvim_win_set_config(self.winid, {
-                height = self:compute_height(),
-            })
+            self:refresh_subtree(
+                info.node,
+                info.line_number,
+                info.subtree_count
+            )
         end, debug.traceback)
 
         if not ok then
@@ -190,4 +282,128 @@ function Window:expand_at_cursor()
     end)()
 end
 
+function Window:collapse_parent()
+    if not self.tree then
+        return
+    end
+
+    coroutine.wrap(function()
+        local ok, err = xpcall(function()
+            if self:goto_parent() then
+                self:toggle_node()
+            end
+        end, debug.traceback)
+
+        if not ok then
+            log.error("Collapse failed:\n%s", err)
+        end
+    end)()
+end
+
+function Window:expand_all_at_cursor()
+    if not self.tree then
+        return
+    end
+
+    coroutine.wrap(function()
+        local ok, err = xpcall(function()
+            local info = self:get_current_node_info()
+            if not info:is_valid() or not info.node:is_container() then
+                return
+            end
+
+            local success = self.tree:expand_all_children(info.node)
+            if not success then
+                return
+            end
+
+            self:refresh_subtree(
+                info.node,
+                info.line_number,
+                info.subtree_count
+            )
+        end, debug.traceback)
+
+        if not ok then
+            log.error("Expand all failed:\n%s", err)
+        end
+    end)()
+end
+
+function Window:collapse_all_at_cursor()
+    if not self.tree then
+        return
+    end
+
+    coroutine.wrap(function()
+        local ok, err = xpcall(function()
+            local info = self:get_current_node_info()
+            if not info:is_valid() or not info.node:is_container() then
+                return
+            end
+
+            self.tree:collapse_all_children(info.node)
+            self:refresh_subtree(
+                info.node,
+                info.line_number,
+                info.subtree_count
+            )
+        end, debug.traceback)
+
+        if not ok then
+            log.error("Collapse all failed:\n%s", err)
+        end
+    end)()
+end
+
+---@return boolean success if parent line was found
+function Window:goto_parent()
+    if not self.tree then
+        return false
+    end
+
+    local lnum = vim.api.nvim_win_get_cursor(self.winid)[1]
+    local node = self.tree:get_node_at_line(lnum)
+    if not node or not node.parent then
+        return false
+    end
+
+    local parent_line = self.tree:get_line_for_node(node.parent)
+    if parent_line then
+        vim.api.nvim_win_set_cursor(self.winid, { parent_line, 0 })
+        return true
+    end
+
+    return false
+end
+
+function Window:yank_value()
+    if not self.tree then
+        return
+    end
+
+    local info = self:get_current_node_info()
+    if not info:is_valid() then
+        return
+    end
+
+    vim.fn.setreg('"', info.node.item.value)
+    vim.fn.setreg("+", info.node.item.value)
+end
+
+function Window:yank_expression()
+    if not self.tree then
+        return
+    end
+
+    local info = self:get_current_node_info()
+    if not info:is_valid() then
+        return
+    end
+
+    local expr = info.node:get_full_expression()
+    vim.fn.setreg('"', expr)
+    vim.fn.setreg("+", expr)
+end
+
 return Window