Redesignate the eagle test as eeschema tests and build
more like the other unit tests.
Enable as a test in Ctest now that the test executes without
crashing.
The loading of the file with the hardocded part is still
not enabled, as this needs more infrastructure to support it.
Bus upgrades: core new connectivity code
Bus upgrades: eeschema integration and modifications
Bus upgrades: eeschema dialogs
Bus upgrades: netlist export
Bus upgrades: file format changes
Libpolygon can provide its own includes via target_include_dirs PUBLIC.
This means any linking targets do not need to specifiy them manually.
As common requires polygon, the polygon dep is also now no longer
required downstream of libcommon, as it's transisitvely implied
by libcommon's target_link_libraries.
This resolves a circular dependency previously detected and also
simplifies CMakeLists.
The bitmap definitions (BITMAP_DEF and so on) do not
have any dependencies on other libs, including WX. This
means the bitmaps library can be isolated from the other
dependencies.
Common now depends on bitmaps, and libraries that depend
on common can pick it up from the common target_link_libraries,
as it is PUBLIC. This means a lot of targets no longer
need manual bitmap linkage.
This avoids a circular dependency that was previously reported
by static analysis.
Avoiding pulling in WX and other headers into the include
tree of each bitmap .cpp is a huge speed up (around 10x) in
compilation, and the generated static library is also 10x
smaller (20MB vs 200MB)
Add common as a link library to pnsrouter,connectivity.
THese library do still use common code (including bitmaps,
via base_screen.h) and this allows them to pick up the libcommon
includes correctly.
Factor out common dialog code from global symbol library table dialog for
loading initial library table.
Update global symbol library table code to user factored out common dialog
code.
This avoids having to manually specify include/legacy_gal
in and legacy GAL targets, and harominizes with legacy_wx.
This also means .cpp files in common/legacy_gal do not
need to specify the legacy_gal subdirectory, so they
will continue to work as needed when legacy_wx is removed.
Adds a link-time dependency for libngspice, so that other tools may
detect ngspice as a KiCad dependency.
The library is still loaded with dlopen() as it gives a way to reload it
in case of problems. The DLL name is recognized during CMake
configuration and used to load the library at runtime.
Split antialiasing options out from display options. Move
antialiasing to common. Duplicate the rest of display options
for Eeschema.
Implement OnSelectGrid and hookup GAL canvas refresh to
SetPresetGrid.
Add Grid Settings... to View menu and move Show Grid from
preferences to View Menu to match Pcbnew.
All of the schematic object load and save code is implemented in the
legacy schematic plugin so it is no longer required.
Remove unused file with old schematic file loader.
Doxygen comment cleaning.
Remove all symbol libraries from the project file after remapping to
prevent symbols that should be loaded from the cache being loaded from
a library further up the search order. Save the project file to clear
all of the libraries so they never get reloaded again.
Remove the symbol library management dialog and menu entries.
Rename the symbol library table dialog menu entry.
Remove all symbol libraries from default project file to prevent clashes
with the cache library.
Fix illegal symbol naming in Eagle plugin.
- !! Eeschema uses Eagle plugin for loading schematics (i.e. it does not
use KiCad format anymore)
- Fixed build errors
- Fixed a few crashes
- Code formatting
Instead of keeping all items in a boost::ptr_vector(), LIB_ITEMs are now
stored in an integer (KICAD_T) to LIB_ITEMS map.
The map allows to quickly access a subset of items of given type.
As the items are stored per type, there is no need to call
LIB_ITEMS::sort() to assure the correct drawing order. As a result,
libraries load faster.
To retain the old interface, there is a LIB_ITEMS_LIST wrapper for
the map, allowing the developers to access the items as if it was a flat
list-like structure.
Create a new dialog to edit global and project specific symbol library
tables.
Add menu entries for new symbol library table editor in schematic editor
and symbol library editor main frame menus.
Add command event handler for symbol library table editor dialog to
SCH_BASE_FRAME so it is accessible from derived frames.
Fix bug in default environment variables initialization. A test for
existing user defined environment variables was preventing any new
default environment variables added to the list from being initialized.
Create a dialog to give the user options to configure the global symbol
library table the first time Eeschema is run when no global symbol library
table exists.
- Removed ability to generate BOM to file
- Removed Save/Cancel window when closing table
- No longer updates table <after> table is closed
- Bugfix for field names (previously comparison was case insensitive)
- Allows grouping of matched components
- Bulk edit of components in a spreadsheet window
- User can choose to save / undo changes
- All changes are pushed to the undo stack in a single operation
- Export table to HTML / CSV output
Create dialog and code to allow legacy schematic symbols to be remapped
from the old library path look up method to the new symbol library table
method by using the following steps:
1) Create a project symbol library table containing all of the symbol
libraries defined in the old library look up list not found in the
global symbol library table.
2) Map each symbol to the correct symbol in the symbol library table
if possible.
Recreate library link to symbols so look up method can be converted to
symbol library table properly.
Add function to SCH_COMPONENT to link library symbols using the symbol
library table.
This refactors COMPONENT_TREE_SEARCH_CONTAINER into a Model-View-Adapter
architecture comprising:
- eeschema/cmp_tree_model.h
- CMP_TREE_NODE: Base class representing a searchable library
set with scoring and sorting
- CMP_TREE_NODE_UNIT
- CMP_TREE_NODE_ALIAS
- CMP_TREE_NODE_LIB
- CMP_TREE_NODE_ROOT
- eeschema/cmp_tree_model_adapter.h
- CMP_TREE_MODEL_ADAPTER: mediator between wxDataViewCtrl (via
wxDataViewModel) and CMP_TREE_NODE*
+---+ +------------------+
+---+ Generates | A | | VIEW |
| M | from libs | D | wxDataViewModel |------------------|
| O | <---------- | A | <------------------> | wxDataViewCtrl |
| D | | P | |------------------|
| E | <---------> | T | <------------------- | wxTextCtrl |
| L | UpdateScore | E | UpdateSearchString() |------------------|
+---+ | R | | |
+---+ +------------------+
Representing the data with a proper model allows the wxDataViewCtrl to
be updated in bulk, which is significantly faster than the old method of
populating it one item at a time. This also adds flexibility if more
data is to be added in the future (which may come in handy with the
upcoming .sweet format, as that adds more ways components can be related
to each other).
Replacing the wxTreeListCtrl with a wxDataViewCtrl also significantly
reduces the general GUI quirkiness, as wxDataViewCtrl is much more well
behaved.
eeschema now supports arbitrary colors for all object types, and
pcbnew does in GAL canvas. When switching from GAL to legacy canvas,
pcbnew will convert colors to the nearest legacy color.
Create SYM_LIB_TABLE and SYMBOL_LIB_TABLE_ROW objects derived from LIB_TABLE
and LIB_TABLE_ROW respectively for supporting symbol library tables.
Add FPID member to LIB_PART for associating a symbol to a specific library
nickname. Please note, this is not used in any way at this time and will be
implemented when the symbol library table is actually implemented.
Add sym_lib_table keyword to keywords file. This is a temporary measure
until a more elegant method for parsing and formatting library tables can
be implemented.
Build FPID support in the common library instead of the pcbcommon library
for use in Eeschema.
* Factor out PROPERTIES object from the PCB plugin code and move it into
common so it can be used by both the Pcbnew and Eeschema plugins.
* Add schematic I/O plugin manager for loading and saving schematic and
component library files.
* Add initial attempt at a parser for current schematic file format. This
parser will be infinitely more strict than the current parser which is very
forgiving in what it parses.
* Make minor changes to the base bitmap class to support the new parser.
* Add find root sheet support to sheet object to allow fetching the root
sheet from any sheet in the stack.
* Refactor edit one field dialogs to use validators and transfer data to and
from window functions.
* Add code to DIALOG_SHIM to handle validation and transfer functions since
the base dialog class code is not called by EndQuasiModal().
* Add custom validator class for filtering field text control characters.
* Add new field validator to edit schematic component dialog field text
control.
* Add new field validator to edit fields in library editor dialog field
text control.
* Make a few LIB_PART member functions const.
I tried to merge some constants used both in legacy mode and gal mode (which were, before this patch, separate constants).
There is still a serious work to avoid different calculation code for the same text in draw and plot functions.
Work in progress to merge these calculation functions.
* Move add_directory()s in main CMakeList.txt after all find_package()
macros are run so all flags in the main CMakeList.txt are propagated
to the sub-folder CMakeList.txt files.
* Remove commented out include of config.h
* Make the link maps only build on linux as -${TO_LINKER},-cref
-${TO_LINKER},-Map=blah just gives warnings on osx w/ clang
* Make the link maps only build with flag -DKICAD_MAKE_LINK_MAPS is
defined during CMake configuration as they are highly specific.
* Moved the code for setting link maps into the main CMakeList.txt
file to avoid duplication.
* Removed -D__ASSERTMACRO__ from osx as its no longer needed
* Removed a couple of other OSX only things that wouldn't work anyway
* Moved set (BU_CHMOD_BUNDLE_ITEMS) to the main CMakeList.txt as
otherwise it would only work for the KiCad build not the other
applications
* Made KICAD_SCRIPTING_MODULES enable KICAD_SCRIPTING as currently if
you have modules enabled without the scripting base it will on build.
This could be changed to a fatal error saying you need to also enable
scripting but it seems unnecessary.
* Removed duplication of pcbnew.py install code under modules and
scripting since you can't have modules without scripting now
* The resource setting for bitmap2component is too late in the CMakeLists.txt,
and is being ignored. Bitmap2component does not have an icon resource on
Windows. Moving the entire section resolves the issue.
* The other programs only have the mingw special case listed, not the generic
declaration for the resource file so added them.
* Add code to test if any of the components in the schematic cache have been changed
in the component libraries.
* Prompt user to accept or reject components when changes are found.
* If the user chooses to use the components in the cache, create a new library with the old
components and add it to the beginning of the component library list so the schematic will
not be changed.
* Create dialogs to handle user feedback and status.
* move not shared files (sch_item_struct.*, sch_base_frame.h) to eeschema;
* move wxEeschemaStruct.h to eeschema and rename it schframe.h to be consistent with the other corresponding file name schframe.cpp;
* remove few not needed #include
* Make all files generated by make_lexer() dependencies of thier respective build targets.
* Make building Boost a dependency for all libraries.
* Remove duplicate make_lexer() call for Specctra lexer files.
* Fix creation of single app bundle with respect to scripting support.
* Cleanup scripting search paths for OSX.
* Fix some small CMake bugs from previous OSX build change.
* Optimize bundle file structure to be consistent with Apple specs.
* Add helper script for compiling wxWidgets and wxPython
* Update OSX build instructions.
* Compile all binaries into a single application bundle.
* Use CMake BundleUtilities to make application bundle relocatable.
* Restructure build output to directly create an image file.
* Fix default search paths.
* Set KIGITHUB environment variable.
* Added patch to fix wxWidgets so names for OSX.
Ensure some values initialized by the schematic editor and used by libedit are also initialized in libedit even if the schematic editor was not started.
Remove useless commands (save/load project config) in libedit, because now they have no sense.
Eeschema, Pcbnew, and Cvpcb all run under the same process now,
FOR THE VERY FIRST TIME!
*) Added KIWAY::PlayerCreate(), PlayerClose(), and PlayersClose().
*) Factored FRAME_T into <frame_type.h> from ID_DRAWFRAME_TYPE.
*) Found that the following command line is helpful for collecting all the *.kiface
files into the <build>/kicad/ directory so that kicad can find them.
$ cp `find . -name '*.kiface'` kicad/
Maybe somebody will want to rework how the CMake files are organized so all
the binaries can go into the same place. See python-a-mingw-us.
*) This might fix the problem on the Mac where child process windows were not
coming to the front. See ->Raise() in kicad/mainframe.cpp.
*) You can set USE_KIFACE to 0 in kicad/mainframe.cpp to chain load child exes
instead of using the KIFACE modules directly, i.e. revert.
In PATCH_COMMAND, use patch instead of bzr patch if patch or patch.exe is found (mandatory to use msys2 because bzr patch does not work when using msys2)
! The initial testing of this commit should be done using a Debug build so that
all the wxASSERT()s are enabled. Also, be sure and keep enabled the
USE_KIWAY_DLLs option. The tree won't likely build without it. Turning it
off is senseless anyways. If you want stable code, go back to a prior version,
the one tagged with "stable".
* Relocate all functionality out of the wxApp derivative into more finely
targeted purposes:
a) DLL/DSO specific
b) PROJECT specific
c) EXE or process specific
d) configuration file specific data
e) configuration file manipulations functions.
All of this functionality was blended into an extremely large wxApp derivative
and that was incompatible with the desire to support multiple concurrently
loaded DLL/DSO's ("KIFACE")s and multiple concurrently open projects.
An amazing amount of organization come from simply sorting each bit of
functionality into the proper box.
* Switch to wxConfigBase from wxConfig everywhere except instantiation.
* Add classes KIWAY, KIFACE, KIFACE_I, SEARCH_STACK, PGM_BASE, PGM_KICAD,
PGM_SINGLE_TOP,
* Remove "Return" prefix on many function names.
* Remove obvious comments from CMakeLists.txt files, and from else() and endif()s.
* Fix building boost for use in a DSO on linux.
* Remove some of the assumptions in the CMakeLists.txt files that windows had
to be the host platform when building windows binaries.
* Reduce the number of wxStrings being constructed at program load time via
static construction.
* Pass wxConfigBase* to all SaveSettings() and LoadSettings() functions so that
these functions are useful even when the wxConfigBase comes from another
source, as is the case in the KICAD_MANAGER_FRAME.
* Move the setting of the KIPRJMOD environment variable into class PROJECT,
so that it can be moved into a project variable soon, and out of FP_LIB_TABLE.
* Add the KIWAY_PLAYER which is associated with a particular PROJECT, and all
its child wxFrames and wxDialogs now have a Kiway() member function which
returns a KIWAY& that that window tree branch is in support of. This is like
wxWindows DNA in that child windows get this member with proper value at time
of construction.
* Anticipate some of the needs for milestones B) and C) and make code
adjustments now in an effort to reduce work in those milestones.
* No testing has been done for python scripting, since milestone C) has that
being largely reworked and re-thought-out.
and various DIALOG classes called from top frames. See comments in
{eeschema,pcbnew}/invoke_a_dialog.h.
*) Move some dialog classes into *.cpp files from *.h files.
*) void SCH_EDIT_FRAME::OnErc( wxCommandEvent& event ) was opening the modeless
ERC dialog more than once if icon was clicked more than once.
*) Remove BOM stuff.
clean duplicate code.
Simplify HPGL dialog: plot offet removed and replace by only one option (plot origin to center of sheet or not)
This is surely enought.
Delete LEGACY_PLUGIN cache after deleting library of same name.
Remove automatically generted freerouter help header.
Add Normalize() to BOX2.
Clamp some values in the virtual space of drawframe.cpp
* Move all convert from internal to user units functions into separate file.
* Remove internal units parameter from all moved conversion functions.
* Revise all source code that calls the moved conversion functions.
* Compile these conversion routines separately for the appropriate pcb or
schematic internal units.
* Move internal units specific status bar update code into the appropriate
application for updating the status bar.
* Move millimeter user units rounding function to common.cpp.
* Move EDA_TEXT object into separate header and source file.
* Compile EDA_TEXT class separately for BOARD_ITEM and SCH_ITEM units.
* Compile PAGE_INFO class separately for BOARD_ITEM and SCH_ITEM units.
* Minor formatting tweaks to Pcbnew s-expression file.
* Move internal unit formatting functions into BOARD_ITEM and SCH_ITEM.
* Change the minimum required CMake version to 2.6.4 for all build platforms
except Windows and OSX.
* Move all schematic plot code from plot.cpp into the appropriate schematic
objects.
* Create SCH_SCREEN plot method to plot all objects in the schematic
screen.
* Delete plot.cpp and remove it from the CMakeList file.
* Move code from function ClearProjectDrawList() into SCH_SCREEN object
Clear() method.
* Delete eeschema/delsheet.cpp as none of the code in it is ever called.
* Move global spice and net list command line variables into SCH_EDIT_FRAME
object as priviate members and provide access methods.
* Remove unnecessary header includes from eeschema/sheet.cpp.
* Minor coding policy fixes.
* Create library collector class.
* Add clarification menu to library editor when multiple items are found
at the current position.
* Add get clarification menu text to all objects derived from LIB_ITEM.
* Add get menu bitmap for all objects derived from LIB_ITEM.
* Improve LIB_PIN bounding box calculation.
* Rename LIB_ITEM::DoGenCopy to doClone to match behavior defined in base
class EDA_ITEM.
* Minor class renaming for improved code consistency.
* Added less than operator to EDA_ITEM.
* Add item clarification context menu to EESchema when multiple unresolved
items are found at the current cross hair position.
* Add collector class SCH_COLLECTOR for supporting multiple item hit testing.
* Removed bit wise masked filtering from schematic item hit testing.
* Removed all old hit testing functions and methods scattered about the
EESchema source code.
* Move terminal point test function into SCH_SCREEN object.
* Fixed bug in terminal point test when terminating a bus to a label.
* Define the < operator for sorting schematic items.
* Add area calculation method to EDA_Rect item.
* Add method for returning an item's bitmap for menu display purposes.
* Add method for returning an item's menu text for menu display purposes.
* Changed EDA_ITEMS container from boost::ptr_vector to std::vector.
* Factor coordinate string conversion code from EDA_DRAW_FRAME to function
CoordinateToString().
* Move schematic wire and bus break code into schematic screen object.
* Move schematic test for dangling ends into schematic screen object.
* Remove left over debugging output in schematic screen object.
* Remove unused file eeschema/cleanup.cpp.
* Fix bug in schematic line object hit test algorithm.
* Fix a string concatenation compile error added in r2752.
* Rename class WinEDA_BasicFrame to EDA_BASE_FRAME.
* Rename class WinEDA_DrawFrame to EDA_DRAW_FRAME.
* Rename class WinEDA_DrawPanel to EDA_DRAW_PANEL.
* Rename sch_item files to sch_junction.
* Make global variable g_ItemToRepeat a private member of SCH_EDIT_FRAME
object.
* Encapsulate SCH_SCREEN reference count member.
Eeschema: cleaning code. Start work to enhance annotation algorithm.
Already added an option to annotate using sheet number (sheet 1 uses numbers 100 to 199, sheet 2 uses 200 to 299..).
Works fine if deleting existing annotation, but needs work to be used when the existing annotation is kept .
* Fix bug that prevented component from being replaced in library when
the component root name was changed.
* Fix drawing bug when changing text or field item string while move in
progress.
* Fix drawing bug when rotating text item while move in progress.
* Prevent undo or redo when editing a component draw item.
* Fix assert bug when replacing component in library when the component
root name was changed.
* Fix bug in field editor caused by new root alias implementation that
prevented any field from being changed.
* Fix minor spacing issues with EESchema find dialog.
* Deprecate remaining internal linked list code from component library
objects.
* Rename pin object files to match new library object file naming
scheme.
* Move LIB_TEXT object definition into it's own header file.
* All library component object editing is now performed with the ojbect
except LIB_PIN (coming soon).
* Added TRANFORM class to handle coordinate transforms.
* Remove old transform matrix functions.
* More file renaming to align them with the other component library
object file names.
* Fix hot key bugs in library editor to disable edit keys while an item
is being edited.
* Fixed bug when cancelling rotation of text and field objects while
being moved.
* Break classes_body_item.cpp(.h) into more reasonable size bites.
* Rename classes_body_item.cpp(.h) to lib_draw_item.cpp(.h)
* Fix some unsatisfied header file dependencies.
* Add stubs to component library draw item base classe to handle editing
internally.
* Lots of code cleaning.
Revise TokenList2DsnLexer.cmake to take outCppFile and outHeaderFile optinally
and enum mandatorily. Standardize the script's invocation technique within
all the CMakeLists.txt files.
* Add CMake script to generate DSN token header and source file from
token list file.
* Add preliminary component library DSN token list and lexer file to
test script and prepare for new component library file lexer.
* EESchema: right click on ERC check mark displays error in message panel.
* Remove PCBNew header file dependency from common DSN lexer source.
* Minor code clean ups.
* Some bugs fixed
* Starting enhancements in Libedit: menubar and commands to "plot" current component in PNG or SVF file (SVG file not fully working, must be refined)
* Replaced find dialog with wxFormBuilder version.
* New find dialog is modeless, supports more advanced search features,
remembers it's last position, size, search history, and search settings,
and implements initial support for replacing.
* Added Shift+F5 hot key to search for next DRC marker. F5 now just
repeats previous search.
* Minor cosmetic enhancements to label edit dialog.
* Remove tab from grid size text printf to fix toolbar grid combobox
display in wxGTK.
* Updated my TODO list items.
* Changed line clipping function in gr_basic.cpp when USE_WX_ZOOM is
enabled.
* Set wxDC clipping region to client size when drawing outside of paint
event handler.
* Updated kicad and eeschema CMake files as the common library now
requires linking to the polygon library.
* Implement code to allow wxDC to handle coordinate conversions between
device and drawing units.
* Add build settings to enable wxGCDC for wxGraphicsContext testing.
* Remove wxAUI conditional build cruft as it is now required to build
Kicad.
* Fix scroll increment size regression to prevent jumping around the
zoom center position.
* Add find GDI+ cmake module for building on WXMSW when wxGraphicsContext
is enabled.
* Replace EESchema sheet properties dialog with wxFormBuilder version.
* Editing an existing sheet now marks schematic as modified.
* Code style updates for some of my previous work.
* Improvements to the CMP_LIB_ENTRY object.
* Replaced symbol edit export fprintf code with wxFFile implementation.
* GCC compiler warning fix in pcbnew/drc.cpp.
* Replace schematic editor options dialog with wxFormBuilder version.
* Fix ugly wxGTK sizer hack in pin properties dialog.
* Set dialog minimum size after initial fit to prevent dialog controls
from being obscured when resizing.
* Move bitmaps in annotate dialog for cleaner control alignment.
* Replaced library pin properties dialog with wxFormBuilder version.
* Remove DialogBlocks version of pin properties dialog.
* Add pin properties dialog support code to pin object.
* Create single event handler for displaying pin properties dialog.
* Remove left over DialogBlocks project file for annotate dialog.
* Fixed escape key bug in library editor new component dialog.
* Add GetUnitsLabel() to get human readable units for dialog labels.
* Translate French comments in all modified files.
* Some minor clean up of Doxygen comments.
* Created new component library editor draw item dialog box with
wxFormBuilder.
* Removed previous DialogBlocks version of the draw item dialog box.
* Removed some additional global variables used in component library
editor.
* Add IsFillable() method to draw item base object.
* Replace component library editor new component dialog using wxFormBuilder.
* Rename component library draw items to conform to current coding standards.
* Add GetWidth() method to component library draw objects.
* Add regular expression key word search capability to component library object.
* Component library objects renamed for improved readability.
* Fields now move when selected in library editor.
* Add copy constructor to all library draw and library component objects.
* Added copy constructor to EDA_BaseStruct.
* Delete base screen in WinEDA_DrawFrame destructor to prevent potential memory leak.
* Fixed memory access bug when replacing and adding a component to library.
* Moved library component block manipulation code into component object.
* Removed all of the global variables used by the library editor main window object.
* The usual code cleaning and refactoring.
* Add offset and block hit testing to library component objects.
* Improved search for library entries.
* Fixed library component editor component removal and addition.
* Library editor now uses wxUpdateUIEvents for updating all UI objects.
* Added version check to cmake find boost macro.
* Removed unused code in file libalias.cpp.
* Added method to WinEDA_DrawPanel to take mouse out of managed mode.
* Replaced WinEDAListBox buttons with wxStdDialogButtonSizer.
* Moved library draw entries GenCopy method to base class.
* Remove priorque.cpp and priorque.h from CMakeLists.txt.
* The usual code cleaning and uncrustification.
* Require CMake version 2.6.1 on Windows and version 2.6.0 for other systems.
* Update FindSubversion to version from CMake 2.6.1 (localization issue solved).
* Remove FindwxWidgetsCVS and use the default one (some issues solved upstream).
* Formatting style changes.
* MinGWResourceCompiler: change output directory and name of compiled resource file (old resource object files have to be deleted manually, eg. cvpcb/cvpcb_rc.o since the 'make clean' target does not remove them).
* Add some comments.
* Set a NAME_RESOURCES variable in MinGWResourceCompiler.
* Fix looking for zlib under msys (C:\msys\1.0). Minizip now builds under windows with external zlib.
================================================================================
+eeschema
* commiting my changes to allow multiple instances of a given schematic file within
a hierarchy:
** internally, m_currentScreen has been replaced with m_currentSheet,
which is a list or 'path' of screens. The path of screens is used to
generate
a series of timestamps, which is converted to flat component reference via
a look-up
table in the schematic files.
** this means that m_currentScreen is no longer used -- use GetScreen().
** GetScreen is virtual, as some of the dialogs keep around a WinEDA_BaseScreen
pointer.
** all sub-sheets in a given schematic must have different names to generate a
meaningful netlist.