Fix resize behavior of treeview and toolbar

Now toolbarview always compute up-to-date sizes and spacing to adapt to
changes in icon big font.

For treeview and toolbarview revert the goto_size approach to use the
original approach of rxi/lite. In order to make it work when user resizes
dragging the divider we use the view optional method set_target_size().
This latter changes the view's target size instead of changing its size
right away. The size is only changed by the lite's layout and animation
system.

Remove the config.treeview_size variable that was no longer working because
plugins are loaded before the user's config.

data/core/rootview.lua

@@ -96,7 +96,8 @@ local type_map = { up="vsplit", down="vsplit", left="hsplit", right="hsplit" }
 -- and it indicates if the node want to have a fixed size along the axis where the
 -- boolean is true. If not it will be expanded to take all the available space.
 -- The "resizable" flag indicates if, along the "locked" axis the node can be resized
--- by the user.
+-- by the user. If the node is marked as resizable their view should provide a
+-- set_target_size method.
 function Node:split(dir, view, locked, resizable)
   assert(self.type == "leaf", "Tried to split non-leaf node")
   local node_type = assert(type_map[dir], "Invalid direction")
@@ -461,9 +462,8 @@ function Node:resize(axis, value)
     -- resize operation here because for proportional panes the resize is
     -- done using the "divider" value of the parent node.
     if (self.locked and self.locked[axis]) and self.resizable then
-      local view = self.active_view
-      view.size[axis] = value
-      return true
+      assert(self.active_view.set_target_size, "internal error: the view of a resizable \"locked\" node do not provide a set_target_size method")
+      return self.active_view:set_target_size(axis, value)
     end
   else
     local a_resizable = self.a:is_resizable(axis)

data/plugins/toolbarview.lua

@@ -4,10 +4,6 @@ local command = require "core.command"
 local style = require "core.style"
 local View = require "core.view"
 
-local icon_h, icon_w = style.icon_big_font:get_height(), style.icon_big_font:get_width("D")
-local toolbar_spacing = icon_w / 2
-local toolbar_height = icon_h + style.padding.y * 2
-
 local ToolbarView = View:extend()
 
 local toolbar_commands = {
@@ -20,36 +16,39 @@ local toolbar_commands = {
 }
 
 
+local function toolbar_height()
+  return style.icon_big_font:get_height() + style.padding.y * 2
+end
+
+
 function ToolbarView:new()
   ToolbarView.super.new(self)
   self.visible = true
-  self.init_size = toolbar_height
+  self.init_size = true
   self.tooltip = false
 end
 
 
 function ToolbarView:update()
+  local dest_size = self.visible and toolbar_height() or 0
   if self.init_size then
-    self.size.y = self.init_size
+    self.size.y = dest_size
     self.init_size = nil
-  elseif self.goto_size then
-    if self.goto_size ~= self.size.y then
-      self:move_towards(self.size, "y", self.goto_size)
   else
-      self.goto_size = nil
-    end
+    self:move_towards(self.size, "y", dest_size)
   end
   ToolbarView.super.update(self)
 end
 
 
 function ToolbarView:toggle_visible()
-  self.goto_size = self.visible and 0 or toolbar_height
   self.visible = not self.visible
 end
 
 
 function ToolbarView:each_item()
+  local icon_h, icon_w = style.icon_big_font:get_height(), style.icon_big_font:get_width("D")
+  local toolbar_spacing = icon_w / 2
   local ox, oy = self:get_content_offset()
   local index = 0
   local iter = function()
@@ -68,9 +67,9 @@ end
 function ToolbarView:draw()
   self:draw_background(style.background2)
 
-  for item, x, y in self:each_item() do
+  for item, x, y, w, h in self:each_item() do
     local color = item == self.hovered_item and style.text or style.dim
-    common.draw_text(style.icon_big_font, color, item.symbol, nil, x, y, 0, icon_h)
+    common.draw_text(style.icon_big_font, color, item.symbol, nil, x, y, 0, h)
   end
 end
 

data/plugins/treeview.lua

@@ -6,7 +6,7 @@ local keymap = require "core.keymap"
 local style = require "core.style"
 local View = require "core.view"
 
-config.treeview_size = 200 * SCALE
+local treeview_size = 200 * SCALE
 
 local function get_depth(filename)
   local n = 1
@@ -23,12 +23,21 @@ function TreeView:new()
   TreeView.super.new(self)
   self.scrollable = true
   self.visible = true
-  self.init_size = config.treeview_size
+  self.init_size = true
+  self.target_size = treeview_size
   self.cache = {}
   self.last = {}
 end
 
 
+function TreeView:set_target_size(axis, value)
+  if axis == "x" then
+    self.target_size = value
+    return true
+  end
+end
+
+
 function TreeView:get_cached(item, dirname)
   local dir_cache = self.cache[dirname]
   if not dir_cache then
@@ -184,15 +193,12 @@ end
 
 function TreeView:update()
   -- update width
+  local dest = self.visible and self.target_size or 0
   if self.init_size then
-    self.size.x = self.init_size
-    self.init_size = nil
-  elseif self.goto_size then
-    if self.goto_size ~= self.size.x then
-      self:move_towards(self.size, "x", self.goto_size)
+    self.size.x = dest
+    self.init_size = false
   else
-      self.goto_size = nil
-    end
+    self:move_towards(self.size, "x", dest)
   end
 
   TreeView.super.update(self)
@@ -277,14 +283,7 @@ end
 -- register commands and keymap
 command.add(nil, {
   ["treeview:toggle"] = function()
-    if view.visible then
-      view.previous_size = view.size.x
-      view.visible = false
-      view.goto_size = 0
-    else
-      view.visible = true
-      view.goto_size = view.previous_size
-    end
+    view.visible = not view.visible
   end,
 })