Complete Chapter 3, and add Chapter 4 placeholder.

Chapters/ch02-a-side-toolbox.xml

@@ -202,12 +202,12 @@ box_height% = toolbox%!16 - toolbox%!8  : REM Visible Area Maximum Y - Minimum Y
 
 <image id="fig-side-box-pos-plane" file="side-box-pos-plane.png" title="The relationship between the main window and its toolbox" />
 
-<p><reference id="fig-side-box-pos-plane"/> shows the relationship between the main window and its pane. The tops of the two windows (<maths>y1</maths> for the two visible areas) should be level, so we can copy the <maths>y1</maths> value from the main window to the pane. The bottom of the pane (its <maths>y0</maths>) is the height of the pane below the top of the main window.</p>
+<p><reference id="fig-side-box-pos-plane"/> shows the relationship between the main window and its pane. The tops of the two windows (<maths>Y1</maths> for the two visible areas) should be level, so we can copy the <maths>Y1</maths> value from the main window to the pane. The bottom of the pane (its <maths>Y0</maths>) is the height of the pane below the top of the main window.</p>
 
 <code lang="bbcbasic">toolbox%!16 = main%!16                  : REM Visible Area Maximum Y
 toolbox%!8 = main%!16 - box_height%     : REM Visible Area Minimum Y</code>
 
-<p>In a similar way, the right-hand side of the pane (its <maths>x1</maths>) is on the left-hand side of the main window, while its left-hand side is the width of the pane further to the left.</p>
+<p>In a similar way, the right-hand side of the pane (its <maths>X1</maths>) is on the left-hand side of the main window, while its left-hand side is the width of the pane further to the left.</p>
 
 <code lang="bbcbasic">toolbox%!12 = main%!4                   : REM Visible Area Maximum X
 toolbox%!4 = main%!4 - box_width%       : REM Visible Area Minimum X</code>

Chapters/ch04-column-headings.xml

@@ -0,0 +1,57 @@
+<?xml version='1.0' encoding='UTF-8' standalone='no'?>
+
+<!DOCTYPE xmlmanual SYSTEM "../panes.dtd">
+
+<!-- Copyright 2021, Stephen Fryatt (info@stevefryatt.org.uk)
+   -
+   - This file is part of Pane Tutorial:
+   -
+   -   http://www.stevefryatt.org.uk/software/
+   -
+   - Licensed under the EUPL, Version 1.2 only (the "Licence");
+   - You may not use this work except in compliance with the
+   - Licence.
+   -
+   - You may obtain a copy of the Licence at:
+   -
+   -   http://joinup.ec.europa.eu/software/page/eupl
+   -
+   - Unless required by applicable law or agreed to in
+   - writing, software distributed under the Licence is
+   - distributed on an "AS IS" basis, WITHOUT WARRANTIES
+   - OR CONDITIONS OF ANY KIND, either express or implied.
+   -
+   - See the Licence for the specific language governing
+   - permissions and limitations under the Licence.
+  -->
+
+<manual xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="xmldoc.xsd" version="1.8.6">
+
+<!-- Chapter 4
+   -
+   - Column Headings
+  -->
+
+<chapter id="chap-col-head">
+<resources>
+<images>Chapter04</images>
+<downloads>Chapter04</downloads>
+</resources>
+<filename>column-headings.php</filename>
+<uri>column-headings</uri>
+<title>Column Headings</title>
+
+<summary>So far our toolbar has ignored the main window contents; what if we want it to remain in step with the work area?</summary>
+
+<section>
+<p>An alternative to a toolbox at the side of a window, as we <reference id="chap-side-box">created in the last chapter</reference>, is a toolbar across the top of a window. Which to go for is more of a stylistic question than a technical one, and it&rsquo;s possible to have both at the same time. <cite>Ovation&nbsp;Pro</cite> does just this, as seen in <reference id="fig-top-bar-ovation"/>.</p>
+
+<!--image id="fig-top-bar-ovation" file="top-bar-ovation.png" title="Ovation Pro has both a side toolbox and a toolbar at the same time."/ -->
+
+<p>In this chapter, we&rsquo;ll add such a toolbar to our own window, to complement the existing toolbox.</p>
+
+
+</section>
+</chapter>
+</manual>
+

Downloads/Chapter03/TopBar4/!PaneDemo/!Boot,feb

@@ -0,0 +1,24 @@
+| >!Boot
+|
+| Copyright 2021, Stephen Fryatt (info@stevefryatt.org.uk)
+|
+| This file is part of PaneDemo:
+|
+|   http://www.stevefryatt.org.uk/risc-os/panes
+|
+| Permission is hereby granted, free of charge, to any person obtaining
+| a copy of this software and associated documentation files (the
+| "Software"), to deal in the Software without restriction, including
+| without limitation the rights to use, copy, modify, merge, publish,
+| distribute, sublicense, and/or sell copies of the Software, and to
+| permit persons to whom the Software is furnished to do so.
+|
+| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+| OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+| MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+| IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+| CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+| TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+| SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+If "<PaneDemo$Dir>"="" Then Set PaneDemo$Dir <Obey$Dir>

Downloads/Chapter03/TopBar4/!PaneDemo/!Run,feb

@@ -0,0 +1,27 @@
+| >!Run
+|
+| Copyright 2021, Stephen Fryatt (info@stevefryatt.org.uk)
+|
+| This file is part of PaneDemo:
+|
+|   http://www.stevefryatt.org.uk/risc-os/panes
+|
+| Permission is hereby granted, free of charge, to any person obtaining
+| a copy of this software and associated documentation files (the
+| "Software"), to deal in the Software without restriction, including
+| without limitation the rights to use, copy, modify, merge, publish,
+| distribute, sublicense, and/or sell copies of the Software, and to
+| permit persons to whom the Software is furnished to do so.
+|
+| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+| OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+| MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+| IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+| CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+| TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+| SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+Set PaneDemo$Dir <Obey$Dir>
+
+WimpSlot -min 96K -max 96K
+Run <PaneDemo$Dir>.!RunImage

panes.xml

@@ -73,5 +73,6 @@
 <chapter file="ch01-an-example-application.xml"/>
 <chapter file="ch02-a-side-toolbox.xml"/>
 <chapter file="ch03-a-top-toolbar.xml"/>
+<chapter file="ch04-column-headings.xml"/>
 
 </manual>