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Wrap

Text File | 1993-10-31 | 44.4 KB | 1,141 lines

INTRODUCTION ------------ I originally started this project to add a wordwrap feature to the Turbo Vision EDITORS unit. To make matters worse, I'm new to Pascal, and trying to learn the language, Turbo Vision, and event driven programming was just a bit of a hurdle. So I asked for help, LOTS of help, and the next thing I knew I was working with people I've never met trying to create a full-blown IDE compatible wordprocessor, with the wordwrap! Well, it got done, minus the IDE select text features such as read/write/indent blocks, etc. If nothing else, it was one way of learning three things at once. We all had a lot of fun, probably at my expense <grin>. Since that time, I have gone on to other projects, and find that I no longer have the time to support NEWEDIT. What you've got is pretty much all you're going to get, until I can find the time to add new features and/or fix any existing bugs. NEWEDIT.PAS is a complete replacement for the original EDITORS unit. It's major contribution is the implementation of a wordwrap feature. It also has several other features, which will be outlined below. If you decide to use the NEWEDIT unit with your applications, be sure you change your use clause from "uses Editors" to "uses NewEdit" in all code modules that require the editor. Those modules included in the NEWEDIT.ZIP file already do this. You should NOT overwrite your original EDITORS.PAS file! Keep it for reference should you decide to dig into the work I have done and add your own features. Comparison is a learning tool! The rest of this document deals with the modifications I have made, discussing how they work, and whatever quirks you should be familiar with. A command summary is also provided of all the NEWEDIT options. Last of all, a brief discussion is given that explains how to implement your own customized key commands. Please note that this document is NOT written for users. It is written for you, the programmer. A lot of the information contained herein would severely confuse your users due to its technical nature. Don't make life harder on them by cutting and pasting the current text to make a quick users guide. Take the time and effort to write your own, and make it as simple as possible. HOW TO USE IT ------------- I figured I'd put this right up front so you can jump right into it. You can use the program either as is, or you can yank out NEWEDIT and simply patch it into your application. I'll discuss both methods. Using NEDEMO ------------ Your best bet is to create a directory and dump all the NEWEDIT.ZIP files into it. Baring that, put the files wherever you want. Next, ensure that all the units called in NEDEMO.PAS are available for compilation. Now, compile the NEDEMO.PAS source. All the other units will compile. If you get an error message stating that a unit can't be compiled, fix your Options|Directories so the path to the unit is correct. Or, take the unit TPU or PAS file and put it in your compilation directory. Plug Into Your Application -------------------------- The NEWEDIT unit is plug-in compatible with the standard EDITORS unit. If you're not interested in the NEDEMO program, but want to use the NEWEDIT unit as is, you can easily patch it into your application. You will need the EDITPKG.PAS and NEWEDIT.PAS programs. NEWEDIT.PAS is the actual editor. EDITPKG.PAS contains all the dialogs and calls to the clipboard and editor. 1) In your main application INIT constructor, insert this line BEFORE you use "TApplication.Init": EditPkg.Initialize_The_Editor; Then load any previous desktop and disable any editor commands you don't want the user to have immediate access to. Last of all, initialize the clipboard with this code: EditPkg.Initialize_The_Clipboard; Look at the T_EditDemo.Init code in NEDEMO.PAS if you have questions. 2) In your main application HandleEvent code, insert this line for opening new files: cmNew : EditPkg.Open_Editor ('', True); 3) In your main application HandleEvent code, insert this line for opening existing disk files: cmOpen : EditPkg.Run_The_Editor; 4) If you write the desktop to disk, for any reason, be sure you deallocate and reallocate the clipboard. Failure to do so will cause your desktop file to start growing and growing! Insert this code around your save desktop code: EditPkg.Deallocate_The_Clipboard; {Your code goes here!} EditPkg.Initialize_The_Clipboard; If you have any questions on this, look in the NEDEMO.PAS T_EditDemo.Save_Desktop function for how it should be done. 5) In your application's DONE destructor, be sure you deallocate the editor buffer AFTER "TApplication.Done": TApplication.Done; EditPkg.Deallocate_The_Editor; 6) Check all units to ensure that "uses EDITORS" is changed to "uses NEWEDIT". 7) If you want to use my help system, the EDITHELP.TXT file will probably have to be revised to suit your hc???? constant naming convention. That, or you'll have to write your own. It's not as difficult as it sounds. I've done it with a minimum of fuss, and several of the beta testers have done the same thing. COMPILER SETTINGS ----------------- If you have difficulty compiling, these are my default compiler settings: {$A+,B-,D+,E+,F+,G+,I+,L+,N-,O+,P-,Q+,R+,S+,T-,V+,X+,Y+} {$M 16384,0,655360} CREATING HELP ------------- The file EDITHELP.TXT contains the source for the context sensitive help system. You must compile it with the TVHC.EXE program to make it functional. Included with NED103 is a MAKEHELP.BAT file. Simply type MAKEHELP to generate a usable help file. Ensure that TVHC is in your directory or path. I've done things a bit different than normal here, so some explanation might be in order. All cm???? and hc???? constants are in the CMDFILE.PAS file. Seeing as I've mixed these constants, I didn't want CMDFILE.PAS to be overwritten by the TVHC program. What I do in the batch file is to let TVHC generate an EDITHELP.PAS, EDITHELP.TPU, and EDITHELP.HLP file. I then rename the EDITHELP.HLP file to NEDEMO.HLP and erase the EDITHELP.TPU file. I keep the EDITHELP.PAS file as a handy alphabetical reference. So, the short of it is that NEDEMO requires that the CMDFILE unit be available and that the help file be named NEDEMO.HLP. CODING STYLE ------------ Every one has their way of doing things, and I'm as guilty as the next person. The only reason I bring it up is that coding style may look very foreign to those who do it Borland's way. This is not a justification, just an explanation! I code the way I do so that I can quickly convert code between C, PASCAL, and Ada. I don't put all of my if/elses on one line. I like to see which condition is met when I'm debugging. I use lots of white space so things don't look as bad as they really are <grin>. I use 43/50 column mode and print in compressed mode, therefore my code does tend to go beyond the right margin. Last of all, and this is probably important to some of you, I use fully qualified variable and procedure/function names. I HATE having to figure out where a variable or procedure/function is. Where I work, people are summarily shot for failing to do so! WHEN IS A BUG NOT A BUG? ------------------------ When it's a feature, of course! I've seen several so-called bug reports describing what the authors consider to be bugs in the EDITORS unit, when in fact they are reporting features. Granted, there are some bugs there, and the service these authors provide by reporting them is invaluable. To set the record straight, the following two items are NOT bugs! 1) Pressing ^T will in some instances delete more than just the word you want deleted. Sorry, this is NOT a bug! The Editors unit defines a particular character set. Any character not in that character set is a "non-character". ^T works like this: a) Delete from the cursor position all characters to the first character not defined in our character set. That takes care of the current word. b) Now we need to delete all characters NOT in the character set to the next character that IS in the character set. That deletes the "blank space" between words. Step B is what most people consider the "bug" for you will delete characters that are not in the character set between words. It's the way the Editor was designed! You may not like it, but that doesn't make it a bug! This supposed "bug" is not a problem with NEWEDIT. In the process of changing the character set to acoomodate wordwrap, it has become a non-issue. I just wanted users to be aware of the difference in NEWEDIT and EDITORS. 2) Selecting text and then pressing a key deletes selected text. This is a feature that allows you to quickly do a FIND and then type in new text to replace old text. Yes Virginia, you should use SEARCH/REPLACE, but there are times when this little feature used in conjunction with FIND is invaluable. It also allows you to mark text for quick selection and deleting. Several supposed "fixes" for this feature will do nothing but clobber your FIND and/or SEARCH/REPLACE capabilities. So what if you accidently erase the selected text -- ^Undo it! I have deliberately retained this feature in NEWEDIT. Please do not report to me that FIND and/or SEARCH/REPLACE no longer work because you tried to incorporate one of the "bug fixes" for this alleged problem! 43/50 LINE VIDEO ---------------- Have added the capability of using 43/50 line screens if you have EGA or better. The option can be found in the OPTIONS menu. It is automatically disabled if the user doesn't have the capability. Note that Load/Store remembers what video mode you were in and resets the program to that mode when the desktop is automatically loaded. AUTOINDENT ---------- The AutoIndent command has been changed from ^O to ^QI. I did this for two reasons. The first is that ^O is right next to ^I, the tab key. The other is that ^QI is the WordStar sequence for this feature. It keeps the user out of trouble, and it makes the editor conform more to WordStar, which I presume was Borland's original intent. CENTERING TEXT -------------- A line of text may be centered by using ^OC. Centering is based on the setting of the Right_Margin. If a line is blank, or the length of the line exceeds the Right_Margin value, nothing will happen. Spaces at the beginning of lines are not used when calculating the line length. The cursor will be moved to the end of the line after it has been centered. CHARACTER SET ------------- The original EDITORS unit had the following character set: WordChars: set of Char = ['0'..'9', 'A'..'Z', '_', 'a'..'z']; This implementation of the NEWEDIT unit has changed the character set to be to the following: WordChars: set of Char = ['!'..#255]; This was done to allow simpler coding for the wordwrap feature. Note that the tab character is no longer considered a valid character. This is described in further detail later in the document. Also note that jumping from word to word will no longer bypass extended ASCII characters. COLORS ------ To be quite honest, the whole GetPalette color business is beyond me and the TV documentation, while going into depth on the subject, doesn't lend to clarifying the issue. So, I've done a quick and dirty change of the whole blasted palette. NEDEMO.PAS has a constant called New_Colors. It contains a whole new color scheme. As a programmer, you have several options available to you. You can keep things like I've got them. You can change them back to the TV defaults by deleting the New_Colors constant and the T_EditDemo.GetPalette procedure in its entirety. You can open up APP.PAS and replace the CColor constant data with the New_Colors data to make ALL your applications have these new colors. Just make sure you delete New_Colors and T_EditDemo.GetPalette so you don't duplicate things. You can change New_Colors to use your own color scheme. Play around and see what you would prefer. The ASCII file COLORS.ASC is being distributed with NEWEDIT.ZIP to show you how to change the color palette. It was originally written by CIS member Steve Shafer, 71121,1771, and is available with NED103 by his permission. CONSTANTS --------- I've put all of the NEWEDIT constants that support the new features in the 200 range. I did this to allow programmers to enable/disable these commands in any menu system they design. CTRL-BACKSPACE -------------- Added this feature to allow two options for deleting text from the cursor to the left margin. You can use ^BackSpace or ^QH. CTRL-HOME AND CTRL-END ---------------------- To add compatibility with the regular IDE editor, I have added the ability to jump to the top and bottom of a page. [Ctrl]-[Home] will take the cursor to the top of a page and [Ctrl]-[End] will take the cursor to the bottom of a page. Note that the cursor does NOT go to the first position in the line. The actual position it ends up at is based on the current position of the cursor on the current line when one of these key sequences are pressed, and the length of the new line it ends up on. DESKTOP MENU ------------ The user should have a menu that allows them to load and store the desktop, so I added a DESKTOP menu. I've also added the 43/50 line mode video toggle to this menu. DOCUMENT REFORMAT ----------------- Pressing ^QU will allow you to reformat a document from either the current line, or the beginning of a document, to the end of the document. A dialog box appears with radio buttons asking you where you want to start reformatting. You must be VERY careful when using this option. It is based on the paragraph reformat feature. You will note in that section that reformatting is based on the indentation of the first line in a paragraph, and whether or not the AutoIndent feature is toggled on. Your screen will scroll to follow the reformat process. This allows the user to know something is happening, instead of just having the system lock up while text is reformatted. END OF LINE SPACES ------------------ Spaces at the end of lines are automatically removed. This was required to make the wordwrap and reformat feature work properly. Spaces on blank lines are also removed. Only the CR/LF is kept. Spaces are NOT removed until the cursor has traveled over or onto a line. Therefore, if you load a file created by another ASCII editor that does not strip spaces, they will remain in the document until you move through the document with the cursor keys. INDICATOR LINE -------------- The window TIndicator line has been modified. Instead of that stupid character that pops up to indicate the document has been modified, an "M" now appears. Also, an "I" appears when AutoIndent is active, and a "W" pops up when wordwrap is on. This means I had to take some space away from the cursor stats, but, with only 64K available, I don't think there will be a problem unless the user is entering some weird text. INSERT NEW LINE --------------- Pressing ^N will insert a CR/LF pair at the current cursor position. All characters AT the cursor and to the end of the line will be moved down to the next line. The difference between pressing ^N and [Enter] is that with ^N the cursor stays at its current position and does NOT move down to the next line. The only exception to this would be if the cursor was at the end of a line that has its spaces removed when ^N is pressed. In that case, the cursor goes to the new end of line. This feature was added to allow further compatibility with the current IDE. JUMP TO LINE NUMBER ------------------- Pressing ^JL will allow the user to jump to a particular line number. A dialog box will appear that requests the user input a line number to jump to. Valid entries range from 1 to 9999. I believe 9999 is a high enough range. If someone thinks it should be larger, please let me know. The dialog box differs from the right margin and preset tab dialogs in that the initial Line_Number value is always blank. However, once the user inputs a value it is remembered, thereby allowing the user to jump to the same line number after they scroll around the text. LOAD/STORE OPERATIONS --------------------- The original load/store bug in EDITORS.PAS has been fixed. In addition, new Read/Write streams have been incorporated in TEditor.Load and TEditor.Store to allow saving of the new variables in the TEditor object. MEMORY ------ In the original Borland EDITORS unit, you are allowed to define how much of an edit buffer you can set aside on the heap. This buffer size determines how many editor windows you can have open at one time. The default in the EDITORS unit was to take the buffer size the programmer wanted, and to then allocate all available heap to the editors, and leave the editors buffer size as the free space. So, you got lots of memory so you could open up lots of editor windows. Not everyone wants all that heap set aside for the editors. The EDITPKG unit maintains the Borland default, but by changing two lines in the EDITPKG.Initialize_The_Editor procedure you can set aside exactly how much buffer space you want for the editor, and ONLY that buffer space, leaving the rest of the heap available to your applications. Just search for the label "HEAP" to find these two lines. MENUS ----- How to create menus is pretty much covered in the TurboVision documentation, and I'm not going to cover it here. What I would like to state is that I've provided ready-to-use code in the NEWEDIT unit and the NEDEMO program that will allow you to toggle your menu options on/off. All you need to do is uncomment the code I have in place to make use of toggling your new menu options on/off. The T_EditDemo.Init constructor in NEDEMO contains the original disabling code. The TFileEditor.UpdateCommands procedure in NEWEDIT contains the actual updating code. WARNING!!!! You will pay a HEAVY price for each additional SetCmdState (Command, True) line you uncomment in procedure TfileEditor.UpdateCommands. The price is in system response time. Uncommenting all the lines will turn your fast 64K editor into a slow clunky piece of junk! Of course, you don't really need to disable/enable menu options for editor menus you might design. My advice is to either keep the menu minimal and uncomment only what you really need, or leave all your editor menu options enabled at all times. PARAGRAPH REFORMAT ------------------ This feature is available to the user via the ^B key. It works regardless of whether or not wordwrap is active. Reformatting is based on the current right margin position. As with wordwrap, reformatting is not possible if the cursor is beyond the right margin position. An error dialog will appear. Paragraph reformat also works with the AutoIndent feature. However, it is important to note that the reformat process is based on the current line the cursor happens to be sitting on when ^B is pressed. Therefore, if you use hanging paragraphs (a paragraph where the first line sticks out further to the left margin than the rest of the paragraph) you need to be careful. If the cursor is on the first line of the paragraph, the reformatting takes place according to that line's left margin setting. This is a feature, not a bug. Try the same thing with MicroStar or SideKick and you'll see what I mean. If AutoIndent is on, and the paragraph is so indented that reformatting encounters a word that will not fit on the line according to the left and right margin settings, an error dialog will appear. However, any reformatting accomplished prior to this situation will have taken effect. The cursor should stop on the word it couldn't wrap. This should preclude the reformatting process locking up the system because it can't wrap a word that is too long. The cursor will end up at the first blank line after the paragraph when you press ^B. Therefore, you can reformat paragraphs in quick succession. Note that unlike some other editors, this implementation of paragraph reformatting will retain double spaces after periods, exclamation points, question marks, and colons. If you are in the habit of only using one space, it's not syntactically correct. Two spaces will be inserted instead, providing the cursor was sitting on one of these punctuation marks when the reformatting process was doing its thing. Otherwise, no change will be made to your original text. I've noticed that if the editor is almost filled to capacity and the user tries to do a ^B on one of the last paragraphs, the reformatting doesn't work properly. I have no idea what to do about this, as I suspect it has something to do with buffers and all. PLACE MARKERS ------------- The editor now allows the user to set place markers within the document. ^K#, where # is a value between 1 and 0 on the keyboard, allows the user to set up to 10 place markers. The user can jump to a place marker by pressing ^Q#, where # is a value between 1 and 0 on the keyboard. Place markers are not visible, but they are there none-the-less. They are maintained in an array called Place_Marker, which is contained in the TEditor object. Place markers are constantly updated as the user inserts and deletes text. If a place marker is contained within text that is deleted, it is set back to zero. The cursor key goes nowhere if it encounters a place marker with a zero value as a result of a ^Q# request. Of course, this also means you can not set a place marker in column 1 of line 1, for it is the 0th position in the document. Use [Ctrl]-[PgUp] instead! PRESET TABS ----------- A preset tab feature has been implemented, allowing the user to define up to 74 tab stops. The ^OI keys will bring up a tab stop dialog box. The box has a ruler across the top and an input line beneath the ruler. To set tabs, the user should place a character in the input line directly beneath the ruler setting where a tab is wanted. The input line is a normal TInputLine, therefore its behavior follows the norm. Note that if the input line is filled with spaces the user will not be able to enter any data. To help alleviate this situation, the TInputLine data is stripped of all unnecessary spaces after the last tab stop every time the user exits the dialog box. The data is placed in a string variable called Tab_Settings which is contained in the TEditor object. Tab_Settings is automatically initialized to increments of 7. The initialization takes place in TEditor.Init. Pressing [Esc] or the OK dialog button will keep the current Tab_Settings. RIGHT MARGIN ------------ The user can set the right margin of the document. This is done by pressing the ^OR sequence. A dialog box will appear asking the user to enter a right margin value. The current value will be shown each time the dialog comes up. The default value is 76. The programmer must change this to something else in the TEditor.Init code if they want a different value. The user has only three options; enter the value, press the OK button, or press [Esc]. Pressing OK or [Esc] will keep the current value. Valid entries are 10 through 255. If the user enters a value that is not within this range, the current value is maintained. No error message will be given! The right margin value is contained in the TEditor object. The variable is called Right_Margin. SAVE FEATURES ------------- There are several more save features than normal. I've tried to implement the most important WordStar commands that apply to saving the document. I've also retained Borland's current features. [F2] or ^KS - cmSave - Save text to current file and resume editing. ^KF - cmSaveAs - Save text to another file. ^KD or ^KX - cmSaveDone - Save text to current file and exit editor. Note that where cmSaveAs used to be accessible only through a menu option like "Save As...", it is now accessible to the user, regardless of the programmers menu system, via the ^KF. This applies to all the save features. They are all accessible to the user. SCROLL DOWN ----------- Pressing ^Z emulates the IDE function of scrolling the screen up while maintaining the cursor position. If the original cursor position scrolls off the screen, the cursor scrolls down a line. This forces the cursor to stay in the upper left corner of the screen should the original cursor position scroll away. SCROLL UP --------- Pressing ^W emulates the IDE function of scrolling the screen down while maintaining the cursor position. If the original cursor position scrolls off the screen, the cursor scrolls up a line. This forces the cursor to stay in the lower left corner of the screen should the original cursor position scroll away. SELECT WORD ----------- Pressing ^KT will highlight the current word the cursor is sitting on. This function was added to maintain compatibility with the IDE. The word is marked from the current cursor position to the next space or end of line, whichever comes first. The marked word is put into the clipboard without further effort on the users part. Marking works in the normal manner, i.e., it disappears the moment you move the cursor. Note that NOTHING will happen if you try to use this command when the cursor is sitting on a space or the end of a line. TABS ---- I realize that Borland allows the tab (#9) character in the original editors package. They probably did this to allow a maximal amount of data to fit in a small 64K buffer. However, the current implementation of this NEWEDIT unit does not allow tabs. I did this to make the added features a simpler exercise in coding. Tab works in two different ways. When in INSERT mode, the cursor will attempt to go to the next tab stop, happily INSERTING SPACES as it looks for that next stopping point. If it is at the last tab stop, it stops inserting spaces and takes a big jump to the first character of the next line. Try to keep tab use to a minimum when the cursor is in insert mode. You eat up valuable buffer space real quick! When in OVERSTRIKE mode, the cursor will attempt to go to the next tab stop, happily skipping over characters as it looks for that next stopping point. If it is at the last tab stop, OR the line is too short to allow it to reach the next tab stop, it takes a big jump to the first character of the next line. I think you'll see that if you set your tabs right, you can quickly indent a whole paragraph deeper than it already is. Also, you don't come to a screeching halt. If in OVERSTRIKE mode you can move through a document real quick. TVFORMS DEMO AND PDEMO OBJECT ----------------------------- So, you want wordwrap in your PMemo object? No problem! I'll use the GENPARTS.PAS program for the TVFORMS demo program as an example. Find the line in the function "MakeForm" that looks like this: C := New (PMemo, Init (R, nil, PScrollBar(C), nil, DescrLen)); Now, add these two lines right after it: PMemo(C)^.Word_Wrap := TRUE; PMemo(C)^.Right_Margin := R.B.X - R.A.X; Now you've got wordwrap! You simply type cast the Wordwrap variable to default to TRUE and Right_Margin for where you want wordwrap to occur, and that's all there is to it! Just remember to do this for each and every PMemo you want wordwrap for. NOTE: The editor has an undo buffer. As you type, each character is placed in that buffer so you can undo a mistake. The buffer is part of the memory you request when allocating a TMemo. What this means is that you might encounter an out of memory condition before you actually use all of the buffer. If you do not default to wordwrap, and then type until you run out of memory, attempting to reformat your text will most likely reformat only one or two lines. This is because the wordwrap feature tries to throw in a CR/LF pair, and doesn't succeed. Simply move the cursor to the left and back to the right to clear your undo buffer and then try to wrap the text. If you still can't wrap, you're simply out of memory and have to cut down on your text. Your editor documentation, which is supplied on your original compiler diskettes, discusses this anomaly at length. I don't like it, but I'd rather not muck with the undo buffer at this time. UNDO ---- ^U is the normal undo feature for the NEWEDIT unit. However, to maintain compatibility with the IDE editor, I have also provided a ^QL option. They both do the same job. WORDWRAP -------- Wordwrap is toggled on/off via the ^OW sequence. When wordwrap is on, a "W" appears on the status line. Wordwrap is fast, and should keep up with the most fluid typist. There should be no "jerkiness" in the wrap effect. Wordwrap is based on the "push the line out to the right until the cursor reaches the current right margin setting" principle. Therefore, if you are on a line and inserting text, the text will be pushed beyond the right margin until the cursor gets there, at which point the text beyond the cursor is wrapped. The right margin is considered to be the current right margin value + 1. For example, if your right margin is set to 69, then the cursor CAN go to column 70. Trying to exceed column 70 will cause wordwrap to occur. Wordwrap will not work if the cursor is beyond the current right margin setting. In this event, an error dialog box will appear. Wordwrap will also work with the AutoIndent mode turned on. In this case, the cursor goes to the same first character position on the new line as the line it was on when wrap occurred. If you try to type a blank line of spaces to the right margin, wordwrap will remove the spaces and insert just a CR/LF pair. Wordwrap will also bring up an error message if you try to type in an entire line out to the right margin without spaces. COMMAND SUMMARY --------------- The following list contains all the commands available in this implementation of the Turbo Vision NEWEDIT unit. Command TV Command Description -------------------- ------------- ------------------------------------------------ [Ctrl]-[A] - cmWordLeft Move cursor left to previous word. [Ctrl]-[B] - cmReformPara Reformat paragraph to current margins. [Ctrl]-[C] - cmPageDown Page down one screen. [Ctrl]-[D] - cmCharRight Move cursor right one character. [Ctrl]-[E] - cmLineUp Move cursor up one line. [Ctrl]-[F] - cmWordRight Move cursor right to next word. [Ctrl]-[G] - cmDelChar Delete character cursor is on. [Ctrl]-[H] - cmBackSpace Delete character to left of cursor. [Ctrl]-[I] - cmTabKey Move right to next tab position. [Ctrl]-[J]-[L] - cmJumpLine Jump to a line number. * [Ctrl]-[K]-[#] - cmSetMark0-9 Set place marker (0 to 9). [Ctrl]-[K]-[B] - cmStartSelect Begin selecting text. [Ctrl]-[K]-[C] - cmPaste Copy text from clipboard into document. [Ctrl]-[K]-[D] - cmSaveDone Save document and exit editor immediately. [Ctrl]-[K]-[F] - cmSaveAs Save current document to another file. [Ctrl]-[K]-[H] - cmHideSelect Hide selected text. [Ctrl]-[K]-[K] - cmCopy Copy text from document into clipboard. [Ctrl]-[K]-[S] - cmSave Save document and continue editing. [Ctrl]-[K]-[T] - cmSelectWord Select current word cursor is on. [Ctrl]-[K]-[Y] - cmCut Remove text from document into clipboard. [Ctrl]-[K]-[X] - cmSaveDone Save document and exit editor immediately. [Ctrl]-[L] - cmSearchAgain Continue searching for specified text. [Ctrl]-[M] - cmNewLine Enter CR/LF pair. [Ctrl]-[N] - cmInsertLine Add CR/LF pair AT cursor and keep cursor position. [Ctrl]-[O]-[C] - cmCenterText Center text on cursor line. [Ctrl]-[O]-[I] - cmSetTabs Set tab positions. [Ctrl]-[O]-[R] - cmRightMargin Set right margin position of line. [Ctrl]-[O]-[W] - cmWordWrap Toggle word wrap mode on or off. * [Ctrl]-[Q]-[#] - cmJumpMark0-9 Move cursor to specified place marker (0 to 9). [Ctrl]-[Q]-[A] - cmReplace Search for text and replace it. [Ctrl]-[Q]-[C] - cmTextEnd Move cursor to end of document. [Ctrl]-[Q]-[D] - cmLineEnd Move cursor to end of line. [Ctrl]-[Q]-[F] - cmFind Find specified text. [Ctrl]-[Q]-[H] - cmDelStart Delete text from cursor to start of line. [Ctrl]-[Q]-[I] - cmIndentMode Toggle IndentMode on and off. [Ctrl]-[Q]-[R] - cmTextStart Move cursor to beginning of document. [Ctrl]-[Q]-[S] - cmLineStart Move cursor to beginning of line [Ctrl]-[Q]-[U] - cmReformDoc Reformat the document text. [Ctrl]-[Q]-[Y] - cmDelEnd Delete text from cursor to end of line. [Ctrl]-[R] - cmPageUp Page up one screen. [Ctrl]-[S] - cmCharLeft Move cursor left one character. [Ctrl]-[T] - cmDelWord Delete text from current cursor to next word. [Ctrl]-[U] - cmUndo Restore text to previous state. [Ctrl]-[V] - cmInsMode Toggle cursor between insert and overstrike mode. [Ctrl]-[W] - cmScrollUp Scroll screen up one line keeping cursor position. [Ctrl]-[X] - cmLineDown Move cursor down one line. [Ctrl]-[Y] - cmDelLine Delete line of text cursor is on. [Ctrl]-[Z] - cmScrollDown Scroll screen down one line keeping cursor position. [Backspace] - cmBackspace Delete character to left of cursor. [Left Arrow] - cmCharLeft Move cursor left one character. [Right Arrow] - cmCharRight Move cursor right one character. [Ctrl]-[Left Arrow] - cmWordLeft Move cursor left to previous word. [Ctrl]-[Right Arrow] - cmWordRight Move cursor right to next word. [Home] - cmLineStart Move cursor to start of line. [End] - cmLineEnd Move cursor to end of line. [Ctrl]-[Home] - cmHomePage Move cursor to top of current page. [Ctrl]-[End] - cmEndPage Move cursor to bottom of current page. [Up Arrow] - cmLineUp Move cursor up one line. [Down Arrow] - cmLineDown Move cursor down one line. [PgUp] - cmPageUp Page up one screen. [PgDn] - cmPageDown Page down one screen. [Ctrl]-[PgUp] - cmTextStart Move cursor to beginning of document. [Ctrl]-[PgDn] - cmTextEnd Move cursor to end of document. [Ins] - cmInsMode Toggle cursor between insert and overstrike mode. [Del] - cmDelChar Delete character cursor is on or selected text. [Ctrl]-[BackSpace] - cmDelStart Delete text from cursor to start of line. [Shift]-[Ins] - cmPaste Copy text from clipboard into document. [Shift]-[Del] - cmCut Remove text from document into clipboard. [Ctrl]-[Ins] - cmCopy Copy text from document into clipboard. [Ctrl]-[Del] - cmClear Clear out and dispose of clipboard contents. * NOTE: # implies a numeric value between 1 and 0 on the keyboard. (i.e., 1, 2, 3, 4, 5, 6, 7, 8, 9, 0) IDE COMMANDS NOT SUPPORTED -------------------------- [Ctrl]-[I] - Insert a real tab character. [Ctrl]-[K]-[I] - Indent marked block. [Ctrl]-[K]-[P] - Print marked block [Ctrl]-[K]-[R] - Read a file from disk and insert into document as marked block. [Ctrl]-[K]-[U] - Unindent marked block. [Ctrl]-[K]-[V] - Move marked block. [Ctrl]-[K]-[W] - Write marked block to a file on disk. [Ctrl]-[O]-[T] - Toggle between real tabs and spaced tabs. [Ctrl]-[P]-[?] - Insert a control character (where ? is the character). COMMANDS THAT DIFFER FROM IDE ----------------------------- Command NewEdit IDE ------- ------- --- [Ctrl]-[K]-[F] - Save document to a new file. ---- [Ctrl]-[O]-[I] - Set tab stops Toggle AutoIndent Mode [Ctrl]-[Q]-[I] - Toggle AutoIndent Mode ---- [Ctrl]-[BackSpace] - Delete from cursor to left margin. ---- UNDO Menu Option - Restore the line. [Ctrl]-[Q]-[L] HOW TO ADD CUSTOM KEY COMMANDS ------------------------------ Adding your own custom key commands, and supporting code, is an easy matter. The only requirement is you must understand how the different key arrays are structured. As an example, we'll consider adding user print controls to the editor. We start with the FirstKeys array. Note the array size in the following code fragment: FirstKeys : array[0..46 * 2] of Word = (46, Ord (^A), cmWordLeft, The array has 46 elements. Each element is a word (two bytes). That's what the 46 * 2 means. This is important, for it is how the editor determines which key stroke, or control sequence has been pressed. You will note that FirstKeys consists entirely of control key sequences, ^A, ^B, ^C, etc. To each control key a command is tied, cmWordLeft, cmReformPara, cmPageDown, etc. Not only are control keys found in this array, but also cursor control keys like kbHome, kbEnd, kbUp, etc. So far, it's pretty simple. Now, notice that three control keys have a hex word value assigned to them, ^Q=$FF01, ^K=$FF02, ^O=$FF03, ^J=$FF04. Just what are these word values? They are flags that let the NEWEDIT unit know when a special control sequence has been pressed that requires further evaluation of an additional key to complete the command. For example, ^QI, ^KB, ^OR, or ^JL. How does it work? The answer is the high byte in the command tied to the keystroke, which is $FF for these four special keys. This is a flag that tells the ConvertEvent procedure to process the key AFTER the control key as the actual command. How does it process it? To answer that question, we need to dig into the other arrays first. Notice that after the FirstKeys array there are several other arrays: QuickKeys, BlockKeys, FormatKeys, JumpKeys, and finally KeyMap. The QuickKeys, BlockKeys, FormatKeys, and JumpKeys are arrays that are tied to the ^Q, ^K, ^O, and ^J keys. These arrays define the possible key commands that could be tied to these keys. To illustrate this, note that FormatKey defines all the valid keystrokes allowed for the ^O command in FirstKeys. The factor that ties the FormatKey array to the ^O command in the FirstKeys array is the low byte in the $FF01 command tied to ^O. How does this work? Very simply put, the order you place your array into the KeyMap array is the determining factor. Let's look at KeyMap. KeyMap : array[0..4] of Pointer = (@FirstKeys, @QuickKeys, @BlockKeys, @FormatKeys, @JumpKeys); Note the order of the array elements in Keymap, and the low byte of the commands tied to the control keys we've been discussing. 0 FirstKeys 1 QuickKeys ^Q $FF01 2 BlockKeys ^K $FF02 3 FormatKeys ^O $FF03 4 JumpKeys ^J $FF04 Do you see the relation? When ConvertEvent sees the $FF as the high byte in the word of the event, it knows that one of these special control key values has been pressed. It then looks for the low byte of the word, and jumps into the KeyMap array to determine the address of the Pointer to the proper array to get the next key interpretation from, based on the position in the KeyMap array corresponding to the low byte. It then goes to that array, finds the correct key, and processes it. For example, ^OR 1) ^O pressed, look it up in FirstKeys. 2) command is $FF03. 3) ConvertEvent finds $FF in the high byte of the word. 4) ConvertEvent knows more data follows and finds the low byte of the command word. 5) The low byte is $03 so ConvertEvent accesses the 3rd element of KeyMap to find the address of FormatKeys. 6) "R" is found in FormatKeys and the command tied to it, cmRightMargin, is placed on the event queue for HandleEvent to process. So, how do we add new commands tied to the ^P key for printing options? First, define some new commands up in the constant area where the cm??? commands are defined. Let's say we want ^PD to print the entire document and ^PC to print the document starting at the current cursor position. So we add new commands called cmPrintStart and cmPrintCurrent and assign them a value not being used by other cm??? commands. So far, so good Second we go to the FirstKeys array and insert ^P as a new command. We have to change the array size (46) to show we have a new command (change 46 to 47 -- BOTH 46's to 47's). Now tie a new command to ^P, in this case it would be $FF05. So, we would have something like this: CONST ... cmPrintFirst = 550 cmPrintCurrent = 551 FirstKeys : array[0..46 * 2] of Word = (46, Ord (^A), cmWordLeft, Ord (^B), cmReformPara, Ord (^C), cmPageDown, Ord (^D), cmCharRight, Ord (^E), cmLineUp, Ord (^F), cmWordRight, Ord (^G), cmDelChar, Ord (^H), cmBackSpace, Ord (^I), cmTabKey, Ord (^J), $FF04,, Ord (^K), $FF02, Ord (^L), cmSearchAgain, Ord (^M), cmNewLine, Ord (^N), cmInsertLine, Ord (^O), $FF03, Ord (^P), $FF05, .... Now we create a new array to hold the print commands. We'll call it PrintKeys. PrintKeys : array[0..2 * 2] of Word = (2, Ord ('C'), cmPrintCurrent, Ord ('D'), cmPrintStart); Last of all we add PrintKeys to the 5th ($FF05) position in KeyMap. Don't forget to change the array range from 4 to 5! KeyMap : array[0..5] of Pointer = (@FirstKeys, @QuickKeys, @BlockKeys, @FormatKeys, @JumpKeys, @PrintKeys); Now, all you need do is add the cmPrintStart and cmPrintCurrent commands to HandleEvent, with the appropriate procedure or function call. Coding these procedures or functions is up to you! Don't forget to include the declaration for the procedure or function inside private portion the TEditor object! Heck! Here's some code Steve Schafer posted on BPROGA that I modified to conform to my coding style. It should get you started. uses ... Printer; procedure TEditor.Print_Document; VAR P: Word; { Position of CurPtr. } begin for P := 0 to BufLen do { Print from beginning to end. } Write (Lst, BufChar (P)); { Print the character. } end { TEditor.Print_Document };