factor banner out into reusable panel class

docs/changelog.txt

@@ -69,6 +69,7 @@ Template for new versions:
 ## Lua
 - ``new()``: improved error handling so that certain errors that were previously uncatchable (creating objects with members with unknown vtables) are now catchable with ``pcall()``
 - ``dfhack.items.getValue()``: remove ``caravan_buying`` param as per C++ API change
+- ``widgets.BannerPanel``: panel with distinctive border for marking DFHack UI elements on otherwise vanilla screens
 
 ## Removed
 

docs/dev/Lua API.rst

@@ -5077,13 +5077,21 @@ This is a specialized subclass of CycleHotkeyLabel that has two options:
 ``On`` (with a value of ``true``) and ``Off`` (with a value of ``false``). The
 ``On`` option is rendered in green.
 
+BannerPanel class
+-----------------
+
+This is a Panel subclass that prints a distinctive banner along the far left
+and right columns of the widget frame. Note that this is not a "proper" frame
+since it doesn't have top or bottom borders. Subviews of this panel should
+inset their frames one tile from the left and right edges.
+
 TextButton class
 ----------------
 
-This is a Panel subclass that wraps a HotkeyLabel with some decorators on the
-sides to make it look more like a button, suitable for both graphics and ASCII
-mdoes. All HotkeyLabel parameters passed to the constructor are passed through
-to the wrapped HotkeyLabel.
+This is a BannerPanel subclass that wraps a HotkeyLabel with some decorators on
+the sides to make it look more like a button, suitable for both graphics and
+ASCII modes. All HotkeyLabel parameters passed to the constructor are passed
+through to the wrapped HotkeyLabel.
 
 List class
 ----------

library/lua/gui/widgets.lua

@@ -1489,13 +1489,27 @@ function HotkeyLabel:onInput(keys)
     end
 end
 
+-----------------
+-- BannerPanel --
+-----------------
+
+BannerPanel = defclass(BannerPanel, Panel)
+
+local BANNER_PEN = dfhack.pen.parse{fg=COLOR_YELLOW, bg=COLOR_RED}
+
+function BannerPanel:onRenderBody(dc)
+    dc:pen(BANNER_PEN)
+    for y=0,self.frame_rect.height-1 do
+        dc:seek(0, y):char(string.char(221)) -- half-width stripe on left
+        dc:seek(self.frame_rect.width-1):char(string.char(222)) -- half-width stripe on right
+    end
+end
+
 ----------------
 -- TextButton --
 ----------------
 
-TextButton = defclass(TextButton, Panel)
-
-local BUTTON_PEN = dfhack.pen.parse{fg=COLOR_YELLOW, bg=COLOR_RED}
+TextButton = defclass(TextButton, BannerPanel)
 
 function TextButton:init(info)
     self.label = HotkeyLabel{
@@ -1516,19 +1530,7 @@ function TextButton:init(info)
         scroll_keys=info.scroll_keys,
     }
 
-    self:addviews{
-        Label{
-            frame={t=0, l=0, w=1},
-            text=string.char(221),  -- half-width stripe on left
-            text_pen=BUTTON_PEN,
-        },
-        self.label,
-        Label{
-            frame={t=0, r=0, w=1},
-            text=string.char(222),  -- half-width stripe on right
-            text_pen=BUTTON_PEN,
-        }
-    }
+    self:addviews{self.label}
 end
 
 function TextButton:setLabel(label)

plugins/lua/zone.lua

@@ -694,13 +694,13 @@ PastureOverlay.ATTRS{
 function PastureOverlay:init()
     self:addviews{
         widgets.TextButton{
-            frame={t=0, l=0},
+            frame={t=0, l=0, r=0, h=1},
             label='DFHack manage pasture',
             key='CUSTOM_CTRL_T',
             on_activate=function() view = view and view:raise() or PastureScreen{}:show() end,
         },
         widgets.TextButton{
-            frame={t=2, l=0},
+            frame={t=2, l=0, r=0, h=1},
             label='DFHack autobutcher',
             key='CUSTOM_CTRL_B',
             on_activate=function() dfhack.run_script('gui/autobutcher') end,