diff options
| author | Michael R Sweet <michael.r.sweet@gmail.com> | 1999-01-13 19:28:54 +0000 |
|---|---|---|
| committer | Michael R Sweet <michael.r.sweet@gmail.com> | 1999-01-13 19:28:54 +0000 |
| commit | d7b88a3bcc7e76f38ee5799be7722fd5a10781ef (patch) | |
| tree | d8984d45424c9b2cdb199c1918f38bfea4a8211d /documentation/editor.html | |
| parent | 30fa233681467b82b165e7d42cd0bea778b93768 (diff) | |
Updated all links so they work between files.
Revision 1.
git-svn-id: file:///fltk/svn/fltk/trunk@219 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
Diffstat (limited to 'documentation/editor.html')
| -rw-r--r-- | documentation/editor.html | 686 |
1 files changed, 320 insertions, 366 deletions
diff --git a/documentation/editor.html b/documentation/editor.html index 12c7edb12..d55616a83 100644 --- a/documentation/editor.html +++ b/documentation/editor.html @@ -1,41 +1,35 @@ -<HTML> -<BODY> - -<H1 ALIGN=RIGHT><A NAME="editor">4 - Designing a Simple Text Editor</A></H1> - -This chapter takes you through the design of a simple FLTK-based text editor. - +<HTML><BODY> +<H1 ALIGN=RIGHT><A NAME=editor>4 - Designing a Simple Text Editor</A></H1> + This chapter takes you through the design of a simple FLTK-based text +editor. <H2>Determining the Goals of the Text Editor</H2> - -Since this will be the first big project you'll be doing with FLTK, lets define -what we want our text editor to do: - -<ol> - <li>Menu_Bar/menus for all functions. - <li>Edit a single text file. - <li>Load from a file. - <li>Save to a file. - <li>Cut/copy/delete/paste functions. - <li>Search and replace functions. - <li>Keep track of when the file has been changed. -</ol> - + Since this will be the first big project you'll be doing with FLTK, +lets define what we want our text editor to do: +<OL> +<LI>Menu_Bar/menus for all functions. </LI> +<LI>Edit a single text file. </LI> +<LI>Load from a file. </LI> +<LI>Save to a file. </LI> +<LI>Cut/copy/delete/paste functions. </LI> +<LI>Search and replace functions. </LI> +<LI>Keep track of when the file has been changed. </LI> +</OL> <H2>Designing the Main Window</H2> - -Now that we've outlined the goals for our editor, we can begin with the design -of our GUI. Obviously the first thing that we need is a window: - -<ul><pre> + Now that we've outlined the goals for our editor, we can begin with +the design of our GUI. Obviously the first thing that we need is a +window: +<UL> +<PRE> Fl_Window *window; -window = new Fl_Window(640, 480, "Text Editor"); -</pre></ul> - +window = new Fl_Window(640, 480, "Text Editor"); +</PRE> +</UL> <H2>Variables</H2> - -Our text editor will need some global variables to keep track of things: - -<ul><pre> + Our text editor will need some global variables to keep track of +things: +<UL> +<PRE> Fl_Window *window; Fl_Menu_Bar *menubar; Fl_Multiline_Input *input; @@ -47,187 +41,173 @@ Fl_Return_Button *replace_next; Fl_Button *replace_cancel; int changed = 0; -char filename[1024] = ""; -char search[256] = ""; -</pre></ul> - -The <tt>window</tt> variable is our top-level window described previously. -We'll cover the other variables as we build the application. - +char filename[1024] = ""; +char search[256] = ""; +</PRE> +</UL> + The <TT>window</TT> variable is our top-level window described +previously. We'll cover the other variables as we build the +application. <H2>Menu_Bars and Menus</H2> - -The first goal requires us to use a menubar and menus that define -each function the editor needs to perform. The -<a href="#Fl_Menu_Item"><tt>Fl_Menu_Item</tt></a> structure is used to -define the menus and items in a menubar: - -<ul><pre> + The first goal requires us to use a menubar and menus that define each +function the editor needs to perform. The <A href=Fl_Menu_Item.html#Fl_Menu_Item> +<TT>Fl_Menu_Item</TT></A> structure is used to define the menus and +items in a menubar: +<UL> +<PRE> Fl_Menu_Item menuitems[] = { - { "&File", 0, 0, 0, FL_SUBMENU }, - { "&New", FL_ALT + 'n', new_cb }, - { "&Open...", FL_ALT + 'o', open_cb, 0, FL_MENU_DIVIDER }, - { "&Save", FL_ALT + 's', save_cb }, - { "Save &As...", FL_ALT + FL_SHIFT + 's', saveas_cb, 0, FL_MENU_DIVIDER }, - { "&Quit", FL_ALT + 'q', quit_cb }, + { "&File", 0, 0, 0, FL_SUBMENU }, + { "&New", FL_ALT + 'n', new_cb }, + { "&Open...", FL_ALT + 'o', open_cb, 0, FL_MENU_DIVIDER }, + { "&Save", FL_ALT + 's', save_cb }, + { "Save &As...", FL_ALT + FL_SHIFT + 's', saveas_cb, 0, FL_MENU_DIVIDER }, + { "&Quit", FL_ALT + 'q', quit_cb }, { 0 }, - { "&Edit", 0, 0, 0, FL_SUBMENU }, - { "&Undo", FL_ALT + 'z', undo_cb, 0, FL_MENU_DIVIDER }, - { "Cu&t", FL_ALT + 'x', cut_cb }, - { "&Copy", FL_ALT + 'c', copy_cb }, - { "&Paste", FL_ALT + 'v', paste_cb }, - { "&Delete", 0, delete_cb }, + { "&Edit", 0, 0, 0, FL_SUBMENU }, + { "&Undo", FL_ALT + 'z', undo_cb, 0, FL_MENU_DIVIDER }, + { "Cu&t", FL_ALT + 'x', cut_cb }, + { "&Copy", FL_ALT + 'c', copy_cb }, + { "&Paste", FL_ALT + 'v', paste_cb }, + { "&Delete", 0, delete_cb }, { 0 }, - { "&Search", 0, 0, 0, FL_SUBMENU }, - { "&Find...", FL_ALT + 'f', find_cb }, - { "F&ind Again", FL_ALT + 'g', find2_cb }, - { "&Replace...", FL_ALT + 'r', replace_cb }, - { "Re&place Again", FL_ALT + 't', replace2_cb }, + { "&Search", 0, 0, 0, FL_SUBMENU }, + { "&Find...", FL_ALT + 'f', find_cb }, + { "F&ind Again", FL_ALT + 'g', find2_cb }, + { "&Replace...", FL_ALT + 'r', replace_cb }, + { "Re&place Again", FL_ALT + 't', replace2_cb }, { 0 }, { 0 } }; -</pre></ul> - -Once we have the menus defined we can create the <tt>Fl_Menu_Bar</tt> widget -and assign the menus to it with: - -<ul><pre> +</PRE> +</UL> + Once we have the menus defined we can create the <TT>Fl_Menu_Bar</TT> + widget and assign the menus to it with: +<UL> +<PRE> Fl_Menu_Bar *menubar = new Fl_Menu_Bar(0, 0, 640, 30); -menubar->menu(menuitems); -</pre></ul> - -We'll define the callback functions later. - +menubar->menu(menuitems); +</PRE> +</UL> + We'll define the callback functions later. <H2>Editing the Text</H2> - -To keep things simple our text editor will use the -<a href="#Fl_Multiline_Input"><tt>Fl_Multiline_Input</tt></a> widget to -edit the text: - -<ul><pre> + To keep things simple our text editor will use the <A href=Fl_Multiline_Input.html#Fl_Multiline_Input> +<TT>Fl_Multiline_Input</TT></A> widget to edit the text: +<UL> +<PRE> Fl_Multiline_Input *input = new Fl_Multiline_Input(0, 30, 640, 450); -</pre></ul> - -So that we can keep track of changes to the file, we also want to add a -"changed" callback: - -<ul><pre> -input->callback(changed_cb); -input->when(FL_WHEN_CHANGED); -</pre></ul> - -Finally, we want to use a mono-spaced font like <tt>FL_COURIER</tt>: - -<ul><pre> -input->textfont(FL_COURIER); -</pre></ul> - +</PRE> +</UL> + So that we can keep track of changes to the file, we also want to add +a "changed" callback: +<UL> +<PRE> +input->callback(changed_cb); +input->when(FL_WHEN_CHANGED); +</PRE> +</UL> + Finally, we want to use a mono-spaced font like <TT>FL_COURIER</TT>: +<UL> +<PRE> +input->textfont(FL_COURIER); +</PRE> +</UL> <H2>The Replace Dialog</H2> - -We can use the FLTK convenience functions for many of the editor's -dialogs, however the replace dialog needs its own custom window. To -keep things simple we will have a "find" string, a "replace" string, -and "replace all", "replace next", and "cancel" buttons. The strings -are just <tt>Fl_Input</tt> widgets, the "replace all" and "cancel" -buttons are <tt>Fl_Button</tt> widgets, and the "replace next " button -is a <tt>Fl_Return_Button</tt> widget: - -<center><img src=editor-replace.gif></center> - -<ul><pre> -Fl_Window *replace_dlg = new Fl_Window(300, 105, "Replace"); -Fl_Input *replace_find = new Fl_Input(70, 10, 200, 25, "Find:"); -Fl_Input *replace_with = new Fl_Input(70, 40, 200, 25, "Replace:"); -Fl_Button *replace_all = new Fl_Button(10, 70, 90, 25, "Replace All"); -Fl_Button *replace_next = new Fl_Button(105, 70, 120, 25, "Replace Next"); -Fl_Button *replace_cancel = new Fl_Button(230, 70, 60, 25, "Cancel"); -</pre></ul> - + We can use the FLTK convenience functions for many of the editor's +dialogs, however the replace dialog needs its own custom window. To +keep things simple we will have a "find" string, a "replace" string, +and "replace all", "replace next", and "cancel" buttons. The strings +are just <TT>Fl_Input</TT> widgets, the "replace all" and "cancel" +buttons are <TT>Fl_Button</TT> widgets, and the "replace next " button +is a <TT>Fl_Return_Button</TT> widget: +<CENTER><IMG src=./editor-replace.gif></CENTER> +<UL> +<PRE> +Fl_Window *replace_dlg = new Fl_Window(300, 105, "Replace"); +Fl_Input *replace_find = new Fl_Input(70, 10, 200, 25, "Find:"); +Fl_Input *replace_with = new Fl_Input(70, 40, 200, 25, "Replace:"); +Fl_Button *replace_all = new Fl_Button(10, 70, 90, 25, "Replace All"); +Fl_Button *replace_next = new Fl_Button(105, 70, 120, 25, "Replace Next"); +Fl_Button *replace_cancel = new Fl_Button(230, 70, 60, 25, "Cancel"); +</PRE> +</UL> <H2>Callbacks</H2> - -Now that we've defined the GUI components of our editor, we need to define -our callback functions. - + Now that we've defined the GUI components of our editor, we need to +define our callback functions. <H3>changed_cb()</H3> - -This function will be called whenever the user changes any text in the -<tt>input</tt> widget: - -<ul><pre> + This function will be called whenever the user changes any text in the <TT> +input</TT> widget: +<UL> +<PRE> void changed_cb(void) { set_changed(1); } -</pre></ul> - -The <tt>set_changed()</tt> function is one that we will write to set the -changed status on the current file. We're doing it this way because some -of the other callbacks will set the changed status to 0, and also because -we want to show the changed status in the window's title bar. - +</PRE> +</UL> + The <TT>set_changed()</TT> function is one that we will write to set +the changed status on the current file. We're doing it this way +because some of the other callbacks will set the changed status to 0, +and also because we want to show the changed status in the window's +title bar. <H3>copy_cb()</H3> - -This callback function will call <a href="#Fl_Input.copy"> -<tt>input->copy()</tt></a> to copy the currently selected text to the -clipboard: - -<ul><pre> + This callback function will call <A href=#Fl_Input.copy><TT> +input->copy()</TT></A> to copy the currently selected text to the +clipboard: +<UL> +<PRE> void copy_cb(void) { - input->copy(); + input->copy(); } -</pre></ul> - +</PRE> +</UL> <H3>cut_cb()</H3> - -This callback function will call <a href="#Fl_Input_.copy"> -<tt>input->copy()</tt></a> to copy the currently selected text to the -clipboard and then <a href="#Fl_Input_.cut"><tt>input->cut()</tt></a> -to delete it: - -<ul><pre> + This callback function will call <A href=Fl_Input_.html#Fl_Input_.copy><TT> +input->copy()</TT></A> to copy the currently selected text to the +clipboard and then <A href=Fl_Input_.html#Fl_Input_.cut><TT>input->cut()</TT> +</A> to delete it: +<UL> +<PRE> void cut_cb(void) { - input->copy(); - input->cut(); + input->copy(); + input->cut(); } -</pre></ul> - +</PRE> +</UL> <H3>delete_cb()</H3> - -This callback function will call <a href="#Fl_Input_.cut"> -<tt>input->cut()</tt></a> to delete the selected text: - -<ul><pre> + This callback function will call <A href=Fl_Input_.html#Fl_Input_.cut><TT> +input->cut()</TT></A> to delete the selected text: +<UL> +<PRE> void delete_cb(void) { - input->cut(); + input->cut(); } -</pre></ul> - +</PRE> +</UL> <H3>find_cb()</H3> - -This callback function asks for a search string using the -<a href="#fl_input"><tt>fl_input()</tt></a> convenience function and -then calls the <tt>find2_cb()</tt> function to find the string: - -<ul><pre> + This callback function asks for a search string using the <A href=functions.html#fl_input> +<TT>fl_input()</TT></A> convenience function and then calls the <TT> +find2_cb()</TT> function to find the string: +<UL> +<PRE> void find_cb(void) { const char *val; - val = fl_input("Search String:", search); + val = fl_input("Search String:", search); if (val != NULL) { // User entered a string - go find it! strcpy(search, val); find2_cb(); } } -</pre></ul> - +</PRE> +</UL> <H3>find2_cb()</H3> - -This function will find the next occurrence of the search string. If the -search string is blank then we want to pop up the search dialog: - -<ul><pre> + This function will find the next occurrence of the search string. If +the search string is blank then we want to pop up the search dialog: +<UL> +<PRE> void find2_cb(void) { const char *val, *found; int pos; @@ -238,182 +218,174 @@ void find2_cb(void) { return; } - val = input->value() + input->mark(); + val = input->value() + input->mark(); found = strstr(val, search); if (found != NULL) { // Found a match; update the position and mark... - pos = input->mark() + found - val; - input->position(pos, pos + strlen(search)); + pos = input->mark() + found - val; + input->position(pos, pos + strlen(search)); } - else fl_alert("No occurrences of \'%s\' found!", search); + else fl_alert("No occurrences of \'%s\' found!", search); } -</pre></ul> - -If the search string cannot be found we use the <a href="#fl_alert"> -<tt>fl_alert()</tt></a> convenience function to display a message to -that effect. - +</PRE> +</UL> + If the search string cannot be found we use the <A href=#fl_alert><TT> +fl_alert()</TT></A> convenience function to display a message to that +effect. <H3>new_cb()</H3> - -This callback function will clear the input widget and current filename. -It also calls the <tt>check_save()</tt> function to give the user the -opportunity to save the current file first as needed: - -<ul><pre> + This callback function will clear the input widget and current +filename. It also calls the <TT>check_save()</TT> function to give the +user the opportunity to save the current file first as needed: +<UL> +<PRE> void new_cb(void) { if (changed) if (!check_save()) return; filename[0] = '\0'; - input->value(""); + input->value(""); set_changed(0); } -</pre></ul> - +</PRE> +</UL> <H3>open_cb()</H3> - -This callback function will ask the user for a filename and then load -the specified file into the input widget and current filename. It also -calls the <tt>check_save()</tt> function to give the user the -opportunity to save the current file first as needed: - -<ul><pre> + This callback function will ask the user for a filename and then load +the specified file into the input widget and current filename. It also +calls the <TT>check_save()</TT> function to give the user the +opportunity to save the current file first as needed: +<UL> +<PRE> void open_cb(void) { char *newfile; if (changed) if (!check_save()) return; - newfile = fl_file_chooser("Open File?", "*", filename); + newfile = fl_file_chooser("Open File?", "*", filename); if (newfile != NULL) load_file(newfile); } -</pre></ul> - -We call the <tt>load_file()</tt> function to actually load the file. - +</PRE> +</UL> + We call the <TT>load_file()</TT> function to actually load the file. <H3>paste_cb()</H3> - -This callback function will send a FL_PASTE message to the <tt>input</tt> -widget using the <a href="#paste"><tt>Fl::paste()</tt></a> method: - -<ul><pre> + This callback function will send a FL_PASTE message to the <TT>input</TT> + widget using the <A href=functions.html#paste><TT>Fl::paste()</TT></A> + method: +<UL> +<PRE> void paste_cb(void) { Fl::paste(*input); } -</pre></ul> - +</PRE> +</UL> <H3>quit_cb()</H3> - -The quit callback will first see if the current file has been modified, -and if so give the user a chance to save it. It then hides the main window: - -<ul><pre> + The quit callback will first see if the current file has been +modified, and if so give the user a chance to save it. It then hides +the main window: +<UL> +<PRE> void quit_cb(void) { if (changed) if (!check_save()) return; - window->hide(); + window->hide(); } -</pre></ul> - +</PRE> +</UL> <H3>replace_cb()</H3> - -The replace callback just shows the replace dialog: - -<ul><pre> + The replace callback just shows the replace dialog: +<UL> +<PRE> void replace_cb(void) { - replace_dlg->show(); + replace_dlg->show(); } -</pre></ul> - +</PRE> +</UL> <H3>replace2_cb()</H3> - -This callback will replace the next occurence of the replacement string. If -nothing has been entered for the replacement string, then the replace dialog -is displayed instead: - -<ul><pre> + This callback will replace the next occurence of the replacement +string. If nothing has been entered for the replacement string, then +the replace dialog is displayed instead: +<UL> +<PRE> void replace2_cb() { const char *find, *val, *found; int pos; - find = replace_find->value(); + find = replace_find->value(); if (find[0] == '\0') { // Search string is blank; get a new one... - replace_dlg->show(); + replace_dlg->show(); return; } - val = input->value() + input->position(); + val = input->value() + input->position(); found = strstr(val, find); if (found != NULL) { // Found a match; update the position and replace text... - pos = input->position() + found - val; - input->replace(pos, pos + strlen(find), replace_with->value()); - input->position(pos + strlen(replace_with->value())); + pos = input->position() + found - val; + input->replace(pos, pos + strlen(find), replace_with->value()); + input->position(pos + strlen(replace_with->value())); } - else fl_alert("No occurrences of \'%s\' found!", find); + else fl_alert("No occurrences of \'%s\' found!", find); } -</pre></ul> - +</PRE> +</UL> <H3>replall_cb()</H3> - -This callback will replace all occurences of the search string in the file: - -<ul><pre> + This callback will replace all occurences of the search string in the +file: +<UL> +<PRE> void replall_cb() { const char *find, *val, *found; int pos; int times; - find = replace_find->value(); + find = replace_find->value(); if (find[0] == '\0') { // Search string is blank; get a new one... - replace_dlg->show(); + replace_dlg->show(); return; } - input->position(0); + input->position(0); times = 0; // Loop through the whole string do { - val = input->value() + input->position(); + val = input->value() + input->position(); found = strstr(val, find); if (found != NULL) { // Found a match; update the position and replace text... times ++; - pos = input->position() + found - val; - input->replace(pos, pos + strlen(find), replace_with->value()); - input->position(pos + strlen(replace_with->value())); + pos = input->position() + found - val; + input->replace(pos, pos + strlen(find), replace_with->value()); + input->position(pos + strlen(replace_with->value())); } } while (found != NULL); - if (times > 0) fl_message("Replaced %d occurrences.", times); - else fl_alert("No occurrences of \'%s\' found!", find); + if (times > 0) fl_message("Replaced %d occurrences.", times); + else fl_alert("No occurrences of \'%s\' found!", find); } -</pre></ul> - +</PRE> +</UL> <H3>replcan_cb()</H3> - -This callback just hides the replace dialog: - -<ul><pre> + This callback just hides the replace dialog: +<UL> +<PRE> void replcan_cb() { - replace_dlg->hide(); + replace_dlg->hide(); } -</pre></ul> - +</PRE> +</UL> <H3>save_cb()</H3> - -This callback saves the current file. If the current filename is blank it -calls the "save as" callback: - -<ul><pre> + This callback saves the current file. If the current filename is +blank it calls the "save as" callback: +<UL> +<PRE> void save_cb(void) { if (filename[0] == '\0') { // No filename - get one! @@ -422,54 +394,47 @@ void save_cb(void) { } else save_file(filename); } -</pre></ul> - -The <tt>save_file()</tt> function saves the current file to the specified -filename. - +</PRE> +</UL> + The <TT>save_file()</TT> function saves the current file to the +specified filename. <H3>saveas_cb()</H3> - -This callback asks the user for a filename and saves the current file: - -<ul><pre> + This callback asks the user for a filename and saves the current file: +<UL> +<PRE> void saveas_cb(void) { char *newfile; - newfile = fl_file_chooser("Save File As?", "*", filename); + newfile = fl_file_chooser("Save File As?", "*", filename); if (newfile != NULL) save_file(newfile); } -</pre></ul> - -The <tt>save_file()</tt> function saves the current file to the specified -filename. - +</PRE> +</UL> + The <TT>save_file()</TT> function saves the current file to the +specified filename. <H3>undo_cb()</H3> - -The undo callback just calls the <a href="#Fl_Input_.undo"> -<tt>undo()</tt></a> method: - -<ul><pre> + The undo callback just calls the <A href=Fl_Input_.html#Fl_Input_.undo><TT> +undo()</TT></A> method: +<UL> +<PRE> void undo_cb(void) { - input->undo(); + input->undo(); } -</pre></ul> - +</PRE> +</UL> <H2>Other Functions</H2> - -Now that we've defined the callback functions, we need our support functions -to make it all work: - + Now that we've defined the callback functions, we need our support +functions to make it all work: <H3>check_save()</H3> - -This function checks to see if the current file needs to be saved. If -so, it asks the user if they want to save it: - -<ul><pre> + This function checks to see if the current file needs to be saved. If +so, it asks the user if they want to save it: +<UL> +<PRE> int check_save(void) { if (!changed) return 1; - if (fl_ask("The current file has not been saved.\n" - "Would you like to save it now?")) { + if (fl_ask("The current file has not been saved.\n" + "Would you like to save it now?")) { // Save the file... save_cb(); @@ -477,62 +442,59 @@ int check_save(void) { } else return (1); } -</pre></ul> - +</PRE> +</UL> <H3>load_file()</H3> - -This function loads the specified file into the <tt>input</tt> widget: - -<ul><pre> + This function loads the specified file into the <TT>input</TT> widget: +<UL> +<PRE> void load_file(char *newfile) { FILE *fp; char buffer[8192]; int nbytes; int pos; - input->value(""); + input->value(""); - fp = fopen(newfile, "r"); + fp = fopen(newfile, "r"); if (fp != NULL) { // Was able to open file; let's read from it... strcpy(filename, newfile); pos = 0; - while ((nbytes = fread(buffer, 1, sizeof(buffer), fp)) > 0) { - input->replace(pos, pos, buffer, nbytes); + while ((nbytes = fread(buffer, 1, sizeof(buffer), fp)) > 0) { + input->replace(pos, pos, buffer, nbytes); pos += nbytes; } fclose(fp); - input->position(0); + input->position(0); set_changed(0); } else { // Couldn't open file - say so... - fl_alert("Unable to open \'%s\' for reading!"); + fl_alert("Unable to open \'%s\' for reading!"); } } -</pre></ul> - -When loading the file we use the <a href="#Fl_Input_.replace"> -<tt>input->replace()</tt></a> method to "replace" the text at the end of -the buffer. The <tt>pos</tt> variable keeps track of the end of the -buffer. - +</PRE> +</UL> + When loading the file we use the <A href=Fl_Input_.html#Fl_Input_.replace> +<TT>input->replace()</TT></A> method to "replace" the text at the end +of the buffer. The <TT>pos</TT> variable keeps track of the end of the +buffer. <H3>save_file()</H3> - -This function saves the current buffer to the specified file: - -<ul><pre> + This function saves the current buffer to the specified file: +<UL> +<PRE> void save_file(char *newfile) { FILE *fp; - fp = fopen(newfile, "w"); + fp = fopen(newfile, "w"); if (fp != NULL) { // Was able to create file; let's write to it... strcpy(filename, newfile); - if (fwrite(input->value(), 1, input->size(), fp) < 1) { - fl_alert("Unable to write file!"); + if (fwrite(input->value(), 1, input->size(), fp) < 1) { + fl_alert("Unable to write file!"); fclose(fp); return; } @@ -541,17 +503,16 @@ void save_file(char *newfile) { set_changed(0); } else { // Couldn't open file - say so... - fl_alert("Unable to create \'%s\' for writing!"); + fl_alert("Unable to create \'%s\' for writing!"); } } -</pre></ul> - +</PRE> +</UL> <H3>set_changed()</H3> - -This function sets the <tt>changed</tt> variable and updates the window label -accordingly: - -<ul><pre> + This function sets the <TT>changed</TT> variable and updates the +window label accordingly: +<UL> +<PRE> void set_changed(int c) { if (c != changed) { char title[1024]; @@ -559,7 +520,7 @@ void set_changed(int c) { changed = c; - if (filename[0] == '\0') strcpy(title, "Untitled"); + if (filename[0] == '\0') strcpy(title, "Untitled"); else { slash = strrchr(filename, '/'); if (slash == NULL) slash = strrchr(filename, '\\'); @@ -568,36 +529,29 @@ void set_changed(int c) { else strcpy(title, filename); } - if (changed) strcat(title, " (modified)"); + if (changed) strcat(title, " (modified)"); - window->label(title); + window->label(title); } } -</pre></ul> - +</PRE> +</UL> <H2>Compiling the Editor</H2> - -The complete source for our text editor can be found in the -<tt>test/editor.cxx</tt> source file. Both the Makefile and Visual C++ -workspace include the necessary rules to build the editor. You can -also compile it using a standard compiler with: - -<ul><pre> + The complete source for our text editor can be found in the <TT> +test/editor.cxx</TT> source file. Both the Makefile and Visual C++ +workspace include the necessary rules to build the editor. You can +also compile it using a standard compiler with: +<UL> +<PRE> CC -o editor editor.cxx -lfltk -lXext -lX11 -lm -</pre></ul> - -As noted in <a href="#basics">Chapter 1</a>, you may need to include -compiler and linker options to tell them where to find the FLTK library. -Also, the <tt>CC</tt> command may also be called <tt>gcc</tt> or -<tt>c++</tt> on your system. - -<p>Congratulations, you've just built your own text editor! - +</PRE> +</UL> + As noted in <A href=basics.html#basics>Chapter 1</A>, you may need to +include compiler and linker options to tell them where to find the FLTK +library. Also, the <TT>CC</TT> command may also be called <TT>gcc</TT> + or <TT>c++</TT> on your system. +<P>Congratulations, you've just built your own text editor! </P> <H2>The Final Product</H2> - -The final editor window should look like the image below: - -<center><img src=editor.gif></center> - -</BODY> -</HTML> + The final editor window should look like the image below: +<CENTER><IMG src=./editor.gif></CENTER> +</BODY></HTML>
\ No newline at end of file |