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original commit: 257fd79eb7fa346a43d5a2f6896905d19f4e5eec
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Matthew Flatt 1998-08-26 00:11:14 +00:00
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notes/mred/MrEd_100.txt
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@ -3,12 +3,60 @@
* MrEd 100 *
******************
Between versions 53 and 100 of MrEd, the windowing portion of the MrEd
toolbox was drastically simplified and Scheme-ified. We didn't try to
develop an improved windowing model, but instead tried to clean up the
existing model.
The entity known as "MrEd" in previous versions has been split
up. MrEd 53 comprised two parts:
The following are a few highlights of the revision:
* a low-level toolbox (containing names prefixed with wx:) that was
too primitive for real programming (no geometry management); and
* an application framework (containing names prefixed with mred:)
that provided useful window classes (with geometry management) but
much, much more, making it too heavyweight for simple GUI programs.
In MrEd 100, we split up the core toolbox and the application
framework. The new toolbox includes the most useful stuff from the
old mred: domain, such as the windowing classes with geometry
management. These mred: classes replace clumsy wx: classes. Useless
and redundant methods have been eliminated. The overall effect is that
the MrEd 100 toolbox is both smaller and better than the core toolbox
in MrEd 53.
The old mred: classes that implement the application framework---with
its elaborate startup and command-line handling, and esoteric
variations on editor frame classes---has been moved into a separate,
optional library. It is no longer necessary to understand units,
collections, and the framework for bootstrapping large programs to get
a simple MrEd application going.
Unlike MrEd 53, MrEd 100 is just an extension of MzScheme with a
graphical toolbox. No extra files are needed to start the MrEd
executable. Command-line handling for MrEd 100 is the same as for
MzScheme --- the only difference is that MrEd executes
'(graphical-read-eval-print-loop)' on startup instead of
'(read-eval-print-loop)'.
MrEd's `graphical-read-eval-print-loop' implements a *very* primitive
GUI REPL, not the relatively useful REPL that came with the old MrEd
toolbox/framework combo. DrScheme now provides the only development
environment for MrEd. But unlike previous releases, DrScheme 100
provides a REPL that matches MrEd's language exactly.
Everything works in MrEd 100. Previous versions of MrEd made all of
the low-level toolbox (wxWindows) available, regardless of how well
certain parts worked (or how consistently across platforms). Over many
releases, we fixed a lot of things that didn't work, but it was still
hard to say which parts of the toolbox were reliable, even in MrEd
53. For 100, we've turned the tables: everything that is truly useful
works (to the best of our testing), and the other junk has been thrown
away.
======================================================================
0. Highlights of the New MrEd Toolbox
======================================================================
We didn't try to develop an improved windowing model, but instead
tried to clean up the existing model. The following are a few
highlights of the revision:
* The wx/mred split has been eliminated. The wx methods for
manually managing the geometry of windows have been eliminated; the
@ -31,69 +79,72 @@ The following are a few highlights of the revision:
have a label.
* There are hardly any wx:const-... values. Instead, methods that
used to take a single (numerical) flag now take a symbol, and
methods that used to take bitwise-ior'd integers now take a list
of symbols. For example, wx:const-horizontal was replaced by
'horizontal, and wx:const-bitmap-type-gif was replaced with 'gif.
used to take a single (numerical) wx:const- flag now take a symbol,
and methods that used to take bitwise-ior'd wx:const- integers now
take a list of symbols. For example, wx:const-horizontal was
replaced by 'horizontal, and wx:const-bitmap-type-gif was replaced
with 'gif.
* The menu system was turned upside-down, giving it a structure more
like rest of the toolbox. For example, instead of creating a menu
bar and then calling a frame's set-menu-bar method, the new way to
create a menu bar is to provide the frame as a constructor
argument. Menus are created by supplying the parent menu bar to the
class constructor. Menu items are created by instantiating
menu-item% or checkable-menu-item% (or menu% for a submenu) with
a menu argument. There are no menu ids anywhere; when a menu item
is selected, the callback associated with the menu item is executed
(just like when a button is clicked).
create a menu bar is to provide the frame as an initialization
argument when creating a menu bar. Menus are created by supplying
the parent menu bar as an initialization argument (or a parent menu
to create a submenu). Menu items are created by instantiating
menu-item% or checkable-menu-item% with a menu argument. There are
no menu ids anywhere; when a menu item is selected, the callback
associated with the menu item is executed (just like when a button
is clicked).
* Initialization arguments to window class have been re-ordered.
* Initialization arguments for creating windows have been re-ordered.
In general, the order is something like the following:
label [sub-labels] callback parent [init-value] style
^- e.g., items in a radio box
where style is now a list of symbols.
* The "media" names have changed. Roughly, we replaced "media" with
"editor". Here's the mapping for some commonly used classes:
"editor", or drop it when "editor" isn't useful. Here's the name
mapping for some commonly used classes:
media-canvas% => editor-canvas%
media-buffer% => editor<%>
media-edit% => text-editor%
media-pasteboard% => pasteboard-editor%
snip% => snip%
media-snip% => editor-snip%
media-canvas% => editor-canvas%
media-buffer% => editor<%>
media-edit% => text%
media-pasteboard% => pasteboard%
snip% => snip%
media-snip% => editor-snip%
Aside from the renaming, little has changed in the editor toolbox,
Aside from this renaming, little has changed in the editor toolbox,
but it is a little better integrated with system-wide keyboard
focus methods. For example, a frame% has a get-focus-window method,
which returns the frame's subwindow with the current focus, but it
also has a get-focus-object method, which will return an editor<%>
object if an editor-canvas has the keyboard focus.
* The text% and multi-text% controls now work well, because they're
now implemented using the editor classes.
* The text-field% control (formerly wx:text% and wx:multi-text%) now
works well on all platforms because it is implemented using the
editor classes. (The equivalent of a wxmulti-text% is specified via
a style flag when creating a text-field%.)
* The command-event% class was changed to control-event%. It has
very few methods, since the information can always be extracted
from the control.
* The command-event% class was changed to control-event%. It has very
few methods, since the old information can be extracted from the
control.
* Some methods have been renamed to be either more (accurately)
descriptive or more consistent with other method names.
* The device context system has been changed more onservatively.
Some drawing modes eliminated, ...
* The device context system has been changed to provide a larger set
of methods that paint consistently on all platforms. Some drawing
modes eliminated, ... [still hashing out this part]
The canvas% class no longer supplies drawing methods. Instead,
get-dc to get a drawing context (which always has a more
complete set of methods, anyway).
* American spelling is used everywhere: colour -> color, centre
-> center
* Everything works. Originally, we made all of the low-level toolbox
available in MrEd, and then started fixing things that didn't work
as they became useful. Now, we only include something in the
toolbox if it works.
-> center.
The next section shows the new interface/class hierarchy for windows a
few other parts of the toolbox, and the section after that lists all
@ -107,11 +158,16 @@ that accompany an average MrEd release).
======================================================================
1. Interface/Class Type Hierarchy (Selected Excerpts)
======================================================================
[To avoid lines that cross or go in the wrong direction, the following
type hierarchy picture is drawn on a cylinder, with lines from
subarea<%. and subwindow<%> wrapping from the left of the diagram to
the right.]
area<%>
___________________|________________
| | |
subarea<%> window<%> area-container<%>
subarea<%> window<%> area-container<%>
<<<____|____ _____|__________ __|___ ___________________<<<
| | | | | |
subwindow<%> | | | |
@ -123,13 +179,13 @@ that accompany an average MrEd release).
|- check-box% | area-container-window<%> |
|- slider% | | |
|- gauge% | | __________________|
|- text-control<%> | | |
| |- text% | |-------- panel%
| |- multi-text% | | |- horizontal-panel%
|- radio-box% | | |- vertical-panel%
|- list-control<%> | |
|- choice% | |- top-level-window<%>
|- list-box | |- frame%
|- text-field% | | |
|- radio-box% | |-------- panel%
|- list-control<%> | | |- horizontal-panel%
|- choice% | | |- vertical-panel%
|- list-box% | |
| |- top-level-window<%>
| |- frame%
| |- dialog%
canvas<%>
|- canvas%
@ -155,8 +211,8 @@ dc<%>
|- postscript-dc%
editor<%> (maybe has an edit-admin% and some editor-canvas<%>s)
|- text-editor%
|- pasteboard-editor%
|- text%
|- pasteboard%
snip% (as a snip-admin%)
|- text-snip%
@ -289,16 +345,11 @@ gauge% : control<%>
styles: 'horizontal 'vertical
set-value get-value
text-control<%> : control<%>
get-value set-value get-edit
text% : control<%>
<= label parent callback [init-val ""] [style null]
styles: none
multi-text% : control<%>
<= label parent callback [init-val ""] [style null]
styles: none
text-field% : control<%>
<= label parent callback [init-val ""] [style '(single)]
styles: 'single, 'multiple, 'hscroll
get-value set-value
get-edit
radio-box% : control<%>
<= label choices parent callback [style '(vertical)]
@ -485,11 +536,11 @@ get-ps-setup-from-user
<= [message #f] [parent #f] [init-setup #f] [style null]
styles: none
get-color-from-user
get-color-from-user - now supported for all platforms
<= [message #f] [parent #f] [init-color #f] [style null]
styles: none
get-font-from-user
get-font-from-user - now supported for all platforms
<= [message #f] [parent #f] [init-font #f] [style null]
styles: none
@ -519,8 +570,8 @@ append-edit-operation-menu-items
append-edit-font-menu-items
add-editor-keymap-functions
add-text-editor-keymap-functions
add-pasteboard-editor-keymap-functions
add-text-keymap-functions
add-pasteboard-keymap-functions
editor-set-x-selection-mode