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Diffstat (limited to 'documentation/editor.dox')
| -rw-r--r-- | documentation/editor.dox | 424 |
1 files changed, 212 insertions, 212 deletions
diff --git a/documentation/editor.dox b/documentation/editor.dox index f6e37e759..760e2ab1f 100644 --- a/documentation/editor.dox +++ b/documentation/editor.dox @@ -30,7 +30,7 @@ lets define what we want our text editor to do: the design of our GUI. Obviously the first thing that we need is a window, which we'll place inside a class called <TT>EditorWindow</TT>: -<UL><PRE> +\code class EditorWindow : public Fl_Double_Window { public: EditorWindow(int w, int h, const char* t); @@ -46,18 +46,18 @@ class EditorWindow : public Fl_Double_Window { Fl_Text_Editor *editor; char search[256]; }; -</PRE></UL> +\endcode <H2>Variables</H2> <P>Our text editor will need some global variables to keep track of things: -<UL><PRE> +\code int changed = 0; -char filename[256] = ""; +char filename[256] = ""; Fl_Text_Buffer *textbuf; -</PRE></UL> +\endcode <P>The <TT>textbuf</TT> variable is the text editor buffer for our window class described previously. We'll cover the other @@ -70,45 +70,45 @@ define each function the editor needs to perform. The <A href="Fl_Menu_Item.html"><TT>Fl_Menu_Item</TT></A> structure is used to define the menus and items in a menubar:</P> -<UL><PRE> +\code Fl_Menu_Item menuitems[] = { - { "&File", 0, 0, 0, FL_SUBMENU }, - { "&New File", 0, (Fl_Callback *)new_cb }, - { "&Open File...", FL_CTRL + 'o', (Fl_Callback *)open_cb }, - { "&Insert File...", FL_CTRL + 'i', (Fl_Callback *)insert_cb, 0, FL_MENU_DIVIDER }, - { "&Save File", FL_CTRL + 's', (Fl_Callback *)save_cb }, - { "Save File &As...", FL_CTRL + FL_SHIFT + 's', (Fl_Callback *)saveas_cb, 0, FL_MENU_DIVIDER }, - { "New &View", FL_ALT + 'v', (Fl_Callback *)view_cb, 0 }, - { "&Close View", FL_CTRL + 'w', (Fl_Callback *)close_cb, 0, FL_MENU_DIVIDER }, - { "E&xit", FL_CTRL + 'q', (Fl_Callback *)quit_cb, 0 }, + { "&File", 0, 0, 0, FL_SUBMENU }, + { "&New File", 0, (Fl_Callback *)new_cb }, + { "&Open File...", FL_CTRL + 'o', (Fl_Callback *)open_cb }, + { "&Insert File...", FL_CTRL + 'i', (Fl_Callback *)insert_cb, 0, FL_MENU_DIVIDER }, + { "&Save File", FL_CTRL + 's', (Fl_Callback *)save_cb }, + { "Save File &As...", FL_CTRL + FL_SHIFT + 's', (Fl_Callback *)saveas_cb, 0, FL_MENU_DIVIDER }, + { "New &View", FL_ALT + 'v', (Fl_Callback *)view_cb, 0 }, + { "&Close View", FL_CTRL + 'w', (Fl_Callback *)close_cb, 0, FL_MENU_DIVIDER }, + { "E&xit", FL_CTRL + 'q', (Fl_Callback *)quit_cb, 0 }, { 0 }, - { "&Edit", 0, 0, 0, FL_SUBMENU }, - { "&Undo", FL_CTRL + 'z', (Fl_Callback *)undo_cb, 0, FL_MENU_DIVIDER }, - { "Cu&t", FL_CTRL + 'x', (Fl_Callback *)cut_cb }, - { "&Copy", FL_CTRL + 'c', (Fl_Callback *)copy_cb }, - { "&Paste", FL_CTRL + 'v', (Fl_Callback *)paste_cb }, - { "&Delete", 0, (Fl_Callback *)delete_cb }, + { "&Edit", 0, 0, 0, FL_SUBMENU }, + { "&Undo", FL_CTRL + 'z', (Fl_Callback *)undo_cb, 0, FL_MENU_DIVIDER }, + { "Cu&t", FL_CTRL + 'x', (Fl_Callback *)cut_cb }, + { "&Copy", FL_CTRL + 'c', (Fl_Callback *)copy_cb }, + { "&Paste", FL_CTRL + 'v', (Fl_Callback *)paste_cb }, + { "&Delete", 0, (Fl_Callback *)delete_cb }, { 0 }, - { "&Search", 0, 0, 0, FL_SUBMENU }, - { "&Find...", FL_CTRL + 'f', (Fl_Callback *)find_cb }, - { "F&ind Again", FL_CTRL + 'g', find2_cb }, - { "&Replace...", FL_CTRL + 'r', replace_cb }, - { "Re&place Again", FL_CTRL + 't', replace2_cb }, + { "&Search", 0, 0, 0, FL_SUBMENU }, + { "&Find...", FL_CTRL + 'f', (Fl_Callback *)find_cb }, + { "F&ind Again", FL_CTRL + 'g', find2_cb }, + { "&Replace...", FL_CTRL + 'r', replace_cb }, + { "Re&place Again", FL_CTRL + 't', replace2_cb }, { 0 }, { 0 } }; -</PRE></UL> +\endcode <P>Once we have the menus defined we can create the <TT>Fl_Menu_Bar</TT> widget and assign the menus to it with:</P> -<UL><PRE> +\code Fl_Menu_Bar *m = new Fl_Menu_Bar(0, 0, 640, 30); -m->copy(menuitems); -</PRE></UL> +m->copy(menuitems); +\endcode <P>We'll define the callback functions later. @@ -118,48 +118,48 @@ m->copy(menuitems); <A HREF="Fl_Text_Editor.html"><TT>Fl_Text_Editor</TT></A> widget to edit the text: -<UL><PRE> -w->editor = new Fl_Text_Editor(0, 30, 640, 370); -w->editor->buffer(textbuf); -</PRE></UL> +\code +w->editor = new Fl_Text_Editor(0, 30, 640, 370); +w->editor->buffer(textbuf); +\endcode <P>So that we can keep track of changes to the file, we also want to add -a "modify" callback:</P> +a "modify" callback:</P> -<UL><PRE> -textbuf->add_modify_callback(changed_cb, w); -textbuf->call_modify_callbacks(); -</PRE></UL> +\code +textbuf->add_modify_callback(changed_cb, w); +textbuf->call_modify_callbacks(); +\endcode <P>Finally, we want to use a mono-spaced font like <TT>FL_COURIER</TT>: -<UL><PRE> -w->editor->textfont(FL_COURIER); -</PRE></UL> +\code +w->editor->textfont(FL_COURIER); +\endcode <H2>The Replace Dialog</H2> <P>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 +"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:</P> \image html editor-replace.gif "Figure 4-1: The search and replace dialog" -<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> +\code +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"); +\endcode <H2>Callbacks</H2> @@ -171,14 +171,14 @@ need to define our callback functions.</P> <P>This function will be called whenever the user changes any text in the <TT>editor</TT> widget: -<UL><PRE> +\code void changed_cb(int, int nInserted, int nDeleted,int, const char*, void* v) { - if ((nInserted || nDeleted) && !loading) changed = 1; + if ((nInserted || nDeleted) && !loading) changed = 1; EditorWindow *w = (EditorWindow *)v; set_title(w); - if (loading) w->editor->show_insert_position(); + if (loading) w->editor->show_insert_position(); } -</PRE></UL> +\endcode <P>The <TT>set_title()</TT> function is one that we will write to set the changed status on the current file. We're doing it this way @@ -191,12 +191,12 @@ title bar. href="Fl_Text_Editor.html#Fl_Text_Editor.kf_copy"><TT>kf_copy()</TT></A> to copy the currently selected text to the clipboard:</P> -<UL><PRE> +\code void copy_cb(Fl_Widget*, void* v) { EditorWindow* e = (EditorWindow*)v; - Fl_Text_Editor::kf_copy(0, e->editor); + Fl_Text_Editor::kf_copy(0, e->editor); } -</PRE></UL> +\endcode <H3>cut_cb()</H3> @@ -204,12 +204,12 @@ void copy_cb(Fl_Widget*, void* v) { href="Fl_Text_Editor.html#Fl_Text_Editor.kf_cut"><TT>kf_cut()</TT></A> to cut the currently selected text to the clipboard:</P> -<UL><PRE> +\code void cut_cb(Fl_Widget*, void* v) { EditorWindow* e = (EditorWindow*)v; - Fl_Text_Editor::kf_cut(0, e->editor); + Fl_Text_Editor::kf_cut(0, e->editor); } -</PRE></UL> +\endcode <H3>delete_cb()</H3> @@ -217,11 +217,11 @@ void cut_cb(Fl_Widget*, void* v) { href="Fl_Text_Buffer.html#Fl_Text_Buffer.remove_selection"><TT>remove_selection()</TT></A> to delete the currently selected text to the clipboard:</P> -<UL><PRE> +\code void delete_cb(Fl_Widget*, void* v) { - textbuf->remove_selection(); + textbuf->remove_selection(); } -</PRE></UL> +\endcode <H3>find_cb()</H3> @@ -230,18 +230,18 @@ href="functions.html#fl_input2"><TT>fl_input()</TT></A> convenience function and then calls the <TT>find2_cb()</TT> function to find the string: -<UL><PRE> +\code void find_cb(Fl_Widget* w, void* v) { EditorWindow* e = (EditorWindow*)v; const char *val; - val = fl_input("Search String:", e->search); + val = fl_input("Search String:", e->search); if (val != NULL) { // User entered a string - go find it! - strcpy(e->search, val); + strcpy(e->search, val); find2_cb(w, v); } -</PRE></UL> +\endcode <H3>find2_cb()</H3> @@ -249,26 +249,26 @@ void find_cb(Fl_Widget* w, void* v) { string. If the search string is blank then we want to pop up the search dialog: -<UL><PRE> +\code void find2_cb(Fl_Widget* w, void* v) { EditorWindow* e = (EditorWindow*)v; - if (e->search[0] == '\0') { + if (e->search[0] == '\0') { // Search string is blank; get a new one... find_cb(w, v); return; } - int pos = e->editor->insert_position(); - int found = textbuf->search_forward(pos, e->search, &pos); + int pos = e->editor->insert_position(); + int found = textbuf->search_forward(pos, e->search, &pos); if (found) { // Found a match; select and update the position... - textbuf->select(pos, pos+strlen(e->search)); - e->editor->insert_position(pos+strlen(e->search)); - e->editor->show_insert_position(); + textbuf->select(pos, pos+strlen(e->search)); + e->editor->insert_position(pos+strlen(e->search)); + e->editor->show_insert_position(); } - else fl_alert("No occurrences of \'%s\' found!", e->search); + else fl_alert("No occurrences of \'%s\' found!", e->search); } -</PRE></UL> +\endcode <P>If the search string cannot be found we use the <A href="functions.html#fl_alert"><TT>fl_alert()</TT></A> @@ -279,17 +279,17 @@ convenience function to display a message to that effect. 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> +\code void new_cb(Fl_Widget*, void*) { if (!check_save()) return; filename[0] = '\0'; - textbuf->select(0, textbuf->length()); - textbuf->remove_selection(); + textbuf->select(0, textbuf->length()); + textbuf->remove_selection(); changed = 0; - textbuf->call_modify_callbacks(); + textbuf->call_modify_callbacks(); } -</PRE></UL> +\endcode <H3>open_cb()</H3> @@ -298,14 +298,14 @@ 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> +\code void open_cb(Fl_Widget*, void*) { if (!check_save()) return; char *newfile = fl_file_chooser("Open File?", "*", filename); if (newfile != NULL) load_file(newfile, -1); } -</PRE></UL> +\endcode <P>We call the <TT>load_file()</TT> function to actually load the file. @@ -315,12 +315,12 @@ void open_cb(Fl_Widget*, void*) { href="Fl_Text_Editor.html#Fl_Text_Editor.kf_paste"><TT>kf_paste()</TT></A> to paste the clipboard at the current position:</P> -<UL><PRE> +\code void paste_cb(Fl_Widget*, void* v) { EditorWindow* e = (EditorWindow*)v; - Fl_Text_Editor::kf_paste(0, e->editor); + Fl_Text_Editor::kf_paste(0, e->editor); } -</PRE></UL> +\endcode <H3>quit_cb()</H3> @@ -328,123 +328,123 @@ void paste_cb(Fl_Widget*, void* v) { modified, and if so give the user a chance to save it. It then exits from the program: -<UL><PRE> +\code void quit_cb(Fl_Widget*, void*) { - if (changed && !check_save()) + if (changed && !check_save()) return; exit(0); } -</PRE></UL> +\endcode <H3>replace_cb()</H3> <P>The replace callback just shows the replace dialog: -<UL><PRE> +\code void replace_cb(Fl_Widget*, void* v) { EditorWindow* e = (EditorWindow*)v; - e->replace_dlg->show(); + e->replace_dlg->show(); } -</PRE></UL> +\endcode <H3>replace2_cb()</H3> -<P>This callback will replace the next occurence of the replacement +<P>This callback will replace the next occurrence of the replacement string. If nothing has been entered for the replacement string, then the replace dialog is displayed instead: -<UL><PRE> +\code void replace2_cb(Fl_Widget*, void* v) { EditorWindow* e = (EditorWindow*)v; - const char *find = e->replace_find->value(); - const char *replace = e->replace_with->value(); + const char *find = e->replace_find->value(); + const char *replace = e->replace_with->value(); if (find[0] == '\0') { // Search string is blank; get a new one... - e->replace_dlg->show(); + e->replace_dlg->show(); return; } - e->replace_dlg->hide(); + e->replace_dlg->hide(); - int pos = e->editor->insert_position(); - int found = textbuf->search_forward(pos, find, &pos); + int pos = e->editor->insert_position(); + int found = textbuf->search_forward(pos, find, &pos); if (found) { // Found a match; update the position and replace text... - textbuf->select(pos, pos+strlen(find)); - textbuf->remove_selection(); - textbuf->insert(pos, replace); - textbuf->select(pos, pos+strlen(replace)); - e->editor->insert_position(pos+strlen(replace)); - e->editor->show_insert_position(); + textbuf->select(pos, pos+strlen(find)); + textbuf->remove_selection(); + textbuf->insert(pos, replace); + textbuf->select(pos, pos+strlen(replace)); + e->editor->insert_position(pos+strlen(replace)); + e->editor->show_insert_position(); } - else fl_alert("No occurrences of \'%s\' found!", find); + else fl_alert("No occurrences of \'%s\' found!", find); } -</PRE></UL> +\endcode <H3>replall_cb()</H3> -<P>This callback will replace all occurences of the search +<P>This callback will replace all occurrences of the search string in the file: -<UL><PRE> +\code void replall_cb(Fl_Widget*, void* v) { EditorWindow* e = (EditorWindow*)v; - const char *find = e->replace_find->value(); - const char *replace = e->replace_with->value(); + const char *find = e->replace_find->value(); + const char *replace = e->replace_with->value(); - find = e->replace_find->value(); + find = e->replace_find->value(); if (find[0] == '\0') { // Search string is blank; get a new one... - e->replace_dlg->show(); + e->replace_dlg->show(); return; } - e->replace_dlg->hide(); + e->replace_dlg->hide(); - e->editor->insert_position(0); + e->editor->insert_position(0); int times = 0; // Loop through the whole string for (int found = 1; found;) { - int pos = e->editor->insert_position(); - found = textbuf->search_forward(pos, find, &pos); + int pos = e->editor->insert_position(); + found = textbuf->search_forward(pos, find, &pos); if (found) { // Found a match; update the position and replace text... - textbuf->select(pos, pos+strlen(find)); - textbuf->remove_selection(); - textbuf->insert(pos, replace); - e->editor->insert_position(pos+strlen(replace)); - e->editor->show_insert_position(); + textbuf->select(pos, pos+strlen(find)); + textbuf->remove_selection(); + textbuf->insert(pos, replace); + e->editor->insert_position(pos+strlen(replace)); + e->editor->show_insert_position(); times++; } } - if (times) fl_message("Replaced %d occurrences.", times); - else fl_alert("No occurrences of \'%s\' found!", find); + if (times) fl_message("Replaced %d occurrences.", times); + else fl_alert("No occurrences of \'%s\' found!", find); } -</PRE></UL> +\endcode <H3>replcan_cb()</H3> <P>This callback just hides the replace dialog: -<UL><PRE> +\code void replcan_cb(Fl_Widget*, void* v) { EditorWindow* e = (EditorWindow*)v; - e->replace_dlg->hide(); + e->replace_dlg->hide(); } -</PRE></UL> +\endcode <H3>save_cb()</H3> <P>This callback saves the current file. If the current filename is -blank it calls the "save as" callback: +blank it calls the "save as" callback: -<UL><PRE> +\code void save_cb(void) { if (filename[0] == '\0') { // No filename - get one! @@ -453,7 +453,7 @@ void save_cb(void) { } else save_file(filename); } -</PRE></UL> +\endcode <P>The <TT>save_file()</TT> function saves the current file to the specified filename. @@ -462,14 +462,14 @@ specified filename. <P>This callback asks the user for a filename and saves the current file: -<UL><PRE> +\code 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> +\endcode <P>The <TT>save_file()</TT> function saves the current file to the specified filename. @@ -484,13 +484,13 @@ functions to make it all work: <P>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> +\code int check_save(void) { if (!changed) return 1; - int r = fl_choice("The current file has not been saved.\n" - "Would you like to save it now?", - "Cancel", "Save", "Discard"); + int r = fl_choice("The current file has not been saved.\n" + "Would you like to save it now?", + "Cancel", "Save", "Discard"); if (r == 1) { save_cb(); // Save the file... @@ -499,34 +499,34 @@ int check_save(void) { return (r == 2) ? 1 : 0; } -</PRE></UL> +\endcode <H3>load_file()</H3> <P>This function loads the specified file into the <TT>textbuf</TT> class: -<UL><PRE> +\code int loading = 0; void load_file(char *newfile, int ipos) { loading = 1; int insert = (ipos != -1); changed = insert; - if (!insert) strcpy(filename, ""); + if (!insert) strcpy(filename, ""); int r; - if (!insert) r = textbuf->loadfile(newfile); - else r = textbuf->insertfile(newfile, ipos); + if (!insert) r = textbuf->loadfile(newfile); + else r = textbuf->insertfile(newfile, ipos); if (r) - fl_alert("Error reading from file \'%s\':\n%s.", newfile, strerror(errno)); + fl_alert("Error reading from file \'%s\':\n%s.", newfile, strerror(errno)); else if (!insert) strcpy(filename, newfile); loading = 0; - textbuf->call_modify_callbacks(); + textbuf->call_modify_callbacks(); } -</PRE></UL> +\endcode <P>When loading the file we use the <A href="Fl_Text_Buffer.html#Fl_Text_Buffer.loadfile"><TT>loadfile()</TT></A> -method to "replace" the text in the buffer, or the <A +method to "replace" the text in the buffer, or the <A href="Fl_Text_Buffer.html#Fl_Text_Buffer.insertfile"><TT>insertfile()</TT></A> method to insert text in the buffer from the named file. @@ -534,22 +534,22 @@ method to insert text in the buffer from the named file. <P>This function saves the current buffer to the specified file: -<UL><PRE> +\code void save_file(char *newfile) { - if (textbuf->savefile(newfile)) - fl_alert("Error writing to file \'%s\':\n%s.", newfile, strerror(errno)); + if (textbuf->savefile(newfile)) + fl_alert("Error writing to file \'%s\':\n%s.", newfile, strerror(errno)); else strcpy(filename, newfile); changed = 0; - textbuf->call_modify_callbacks(); + textbuf->call_modify_callbacks(); } -</PRE></UL> +\endcode <H3>set_title()</H3> <P>This function checks the <TT>changed</TT> variable and updates the window label accordingly: -<UL><PRE> +\code void set_title(Fl_Window* w) { if (filename[0] == '\0') strcpy(title, "Untitled"); else { @@ -564,9 +564,9 @@ void set_title(Fl_Window* w) { if (changed) strcat(title, " (modified)"); - w->label(title); + w->label(title); } -</PRE></UL> +\endcode <H2>The main() Function</H2> @@ -576,19 +576,19 @@ The <TT>main()</TT> function creates a new text buffer, creates a new view (window) for the text, shows the window, loads the file on the command-line (if any), and then enters the FLTK event loop: -<UL><PRE> +\code int main(int argc, char **argv) { textbuf = new Fl_Text_Buffer; Fl_Window* window = new_view(); - window->show(1, argv); + window->show(1, argv); - if (argc > 1) load_file(argv[1], -1); + if (argc > 1) load_file(argv[1], -1); return Fl::run(); } -</PRE></UL> +\endcode <H2>Compiling the Editor</H2> @@ -596,15 +596,15 @@ int main(int argc, char **argv) { workspace include the necessary rules to build the editor. You can also compile it using a standard compiler with: -<UL><PRE> +\code CC -o editor editor.cxx -lfltk -lXext -lX11 -lm -</PRE></UL> +\endcode <P>or by using the <TT>fltk-config</TT> script with: -<UL><PRE> +\code fltk-config --compile editor.cxx -</PRE></UL> +\endcode <P>As noted in <A href="basics.html">Chapter 1</A>, you may need to include compiler and linker options to tell them where to find the FLTK @@ -636,16 +636,16 @@ size of the text that is drawn. <P>Styles are defined using the <CODE>Fl_Text_Display::Style_Table_Entry</CODE> structure -defined in <CODE><FL/Fl_Text_Display.H></CODE>: +defined in <CODE><FL/Fl_Text_Display.H></CODE>: -<UL><PRE> +\code struct Style_Table_Entry { Fl_Color color; Fl_Font font; int size; unsigned attr; }; -</PRE></UL> +\endcode <P>The <CODE>color</CODE> member sets the color for the text, the <CODE>font</CODE> member sets the FLTK font index to use, @@ -655,7 +655,7 @@ text. The <CODE>attr</CODE> member is currently not used. <P>For our text editor we'll define 7 styles for plain code, comments, keywords, and preprocessor directives: -<UL><PRE> +\code Fl_Text_Display::Style_Table_Entry styletable[] = { // Style table { FL_BLACK, FL_COURIER, FL_NORMAL_SIZE }, // A - Plain { FL_DARK_GREEN, FL_COURIER_ITALIC, FL_NORMAL_SIZE }, // B - Line comments @@ -665,7 +665,7 @@ Fl_Text_Display::Style_Table_Entry styletable[] = { // Style table { FL_DARK_RED, FL_COURIER_BOLD, FL_NORMAL_SIZE }, // F - Types { FL_BLUE, FL_COURIER_BOLD, FL_NORMAL_SIZE } // G - Keywords }; -</PRE></UL> +\endcode <P>You'll notice that the comments show a letter next to each style - each style in the style buffer is referenced using a @@ -674,27 +674,27 @@ character starting with the letter 'A'. <P>You call the <CODE>highlight_data()</CODE> method to associate the style data and buffer with the text editor widget: -<UL><PRE> +\code Fl_Text_Buffer *stylebuf; -w->editor->highlight_data(stylebuf, styletable, +w->editor->highlight_data(stylebuf, styletable, sizeof(styletable) / sizeof(styletable[0]), 'A', style_unfinished_cb, 0); -</PRE></UL> +\endcode <P>Finally, you need to add a callback to the main text buffer so that changes to the text buffer are mirrored in the style buffer: -<UL><PRE> -textbuf->add_modify_callback(style_update, w->editor); -</PRE></UL> +\code +textbuf->add_modify_callback(style_update, w->editor); +\endcode <P>The <CODE>style_update()</CODE> function, like the <CODE>change_cb()</CODE> function described earlier, is called whenever text is added or removed from the text buffer. It mirrors the changes in the style buffer and then updates the style data as necessary: -<UL><PRE> +\code // // 'style_update()' - Update the style buffer... // @@ -714,44 +714,44 @@ style_update(int pos, // I - Position of update // If this is just a selection change, just unselect the style buffer... - if (nInserted == 0 && nDeleted == 0) { - stylebuf->unselect(); + if (nInserted == 0 && nDeleted == 0) { + stylebuf->unselect(); return; } // Track changes in the text buffer... - if (nInserted > 0) { + if (nInserted > 0) { // Insert characters into the style buffer... style = new char[nInserted + 1]; memset(style, 'A', nInserted); style[nInserted] = '\0'; - stylebuf->replace(pos, pos + nDeleted, style); + stylebuf->replace(pos, pos + nDeleted, style); delete[] style; } else { // Just delete characters in the style buffer... - stylebuf->remove(pos, pos + nDeleted); + stylebuf->remove(pos, pos + nDeleted); } // Select the area that was just updated to avoid unnecessary // callbacks... - stylebuf->select(pos, pos + nInserted - nDeleted); + stylebuf->select(pos, pos + nInserted - nDeleted); // Re-parse the changed region; we do this by parsing from the // beginning of the line of the changed region to the end of // the line of the changed region... Then we check the last // style character and keep updating if we have a multi-line // comment character... - start = textbuf->line_start(pos); - end = textbuf->line_end(pos + nInserted - nDeleted); - text = textbuf->text_range(start, end); - style = stylebuf->text_range(start, end); + start = textbuf->line_start(pos); + end = textbuf->line_end(pos + nInserted - nDeleted); + text = textbuf->text_range(start, end); + style = stylebuf->text_range(start, end); last = style[end - start - 1]; style_parse(text, style, end - start); - stylebuf->replace(start, end, style); - ((Fl_Text_Editor *)cbArg)->redisplay_range(start, end); + stylebuf->replace(start, end, style); + ((Fl_Text_Editor *)cbArg)->redisplay_range(start, end); if (last != style[end - start - 1]) { // The last character on the line changed styles, so reparse the @@ -759,26 +759,26 @@ style_update(int pos, // I - Position of update free(text); free(style); - end = textbuf->length(); - text = textbuf->text_range(start, end); - style = stylebuf->text_range(start, end); + end = textbuf->length(); + text = textbuf->text_range(start, end); + style = stylebuf->text_range(start, end); style_parse(text, style, end - start); - stylebuf->replace(start, end, style); - ((Fl_Text_Editor *)cbArg)->redisplay_range(start, end); + stylebuf->replace(start, end, style); + ((Fl_Text_Editor *)cbArg)->redisplay_range(start, end); } free(text); free(style); } -</PRE></UL> +\endcode <P>The <CODE>style_parse()</CODE> function scans a copy of the text in the buffer and generates the necessary style characters for display. It assumes that parsing begins at the start of a line: -<UL><PRE> +\code // // 'style_parse()' - Parse text and produce style data. // @@ -794,10 +794,10 @@ style_parse(const char *text, *bufptr; const char *temp; - for (current = *style, col = 0, last = 0; length > 0; length --, text ++) { + for (current = *style, col = 0, last = 0; length > 0; length --, text ++) { if (current == 'A') { // Check for directives, comments, strings, and keywords... - if (col == 0 && *text == '#') { + if (col == 0 && *text == '#') { // Set style to directive current = 'E'; } else if (strncmp(text, "//", 2) == 0) { @@ -814,10 +814,10 @@ style_parse(const char *text, continue; } else if (*text == '\"') { current = 'D'; - } else if (!last && islower(*text)) { + } else if (!last && islower(*text)) { // Might be a keyword... for (temp = text, bufptr = buf; - islower(*temp) && bufptr < (buf + sizeof(buf) - 1); + islower(*temp) && bufptr < (buf + sizeof(buf) - 1); *bufptr++ = *temp++); if (!islower(*temp)) { @@ -825,10 +825,10 @@ style_parse(const char *text, bufptr = buf; - if (bsearch(&bufptr, code_types, + if (bsearch(&bufptr, code_types, sizeof(code_types) / sizeof(code_types[0]), sizeof(code_types[0]), compare_keywords)) { - while (text < temp) { + while (text < temp) { *style++ = 'F'; text ++; length --; @@ -839,10 +839,10 @@ style_parse(const char *text, length ++; last = 1; continue; - } else if (bsearch(&bufptr, code_keywords, + } else if (bsearch(&bufptr, code_keywords, sizeof(code_keywords) / sizeof(code_keywords[0]), sizeof(code_keywords[0]), compare_keywords)) { - while (text < temp) { + while (text < temp) { *style++ = 'G'; text ++; length --; @@ -856,7 +856,7 @@ style_parse(const char *text, } } } - } else if (current == 'C' && strncmp(text, "*/", 2) == 0) { + } else if (current == 'C' && strncmp(text, "*/", 2) == 0) { // Close a C comment... *style++ = current; *style++ = current; @@ -885,7 +885,7 @@ style_parse(const char *text, } // Copy style info... - if (current == 'A' && (*text == '{' || *text == '}')) *style++ = 'G'; + if (current == 'A' && (*text == '{' || *text == '}')) *style++ = 'G'; else *style++ = current; col ++; @@ -898,6 +898,6 @@ style_parse(const char *text, } } } -</PRE></UL> +\endcode */ |