diff options
Diffstat (limited to 'ruby_1_8_6/ext/tk/sample/demos-en/search.rb')
| -rw-r--r-- | ruby_1_8_6/ext/tk/sample/demos-en/search.rb | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/ruby_1_8_6/ext/tk/sample/demos-en/search.rb b/ruby_1_8_6/ext/tk/sample/demos-en/search.rb new file mode 100644 index 0000000000..3d3b4aecc8 --- /dev/null +++ b/ruby_1_8_6/ext/tk/sample/demos-en/search.rb @@ -0,0 +1,180 @@ +# search.rb +# +# This demonstration script creates a collection of widgets that +# allow you to load a file into a text widget, then perform searches +# on that file. +# +# Text Search widget demo (called by 'widget') +# + +# textLoadFile -- +# This method below loads a file into a text widget, discarding +# the previous contents of the widget. Tags for the old widget are +# not affected, however. +# +# Arguments: +# w - The window into which to load the file. Must be a +# text widget. +# file - The name of the file to load. Must be readable. + +def textLoadFile(w,file) + w.delete('1.0', 'end') + f = open(file, 'r') + while(!f.eof?) + w.insert('end', f.read(1000)) + end + f.close +end + +# textSearch -- +# Search for all instances of a given string in a text widget and +# apply a given tag to each instance found. +# +# Arguments: +# w - The window in which to search. Must be a text widget. +# string - The string to search for. The search is done using +# exact matching only; no special characters. +# tag - Tag to apply to each instance of a matching string. + +def textSearch(w, string, tag) + tag.remove('0.0', 'end') + return if string == "" + cur = '1.0' + loop { + cur, len = w.search_with_length(string, cur, 'end') + break if cur == "" + tag.add(cur, "#{cur} + #{len} char") + cur = w.index("#{cur} + #{len} char") + } +end + +# textToggle -- +# This method is invoked repeatedly to invoke two commands at +# periodic intervals. It normally reschedules itself after each +# execution but if an error occurs (e.g. because the window was +# deleted) then it doesn't reschedule itself. +# +# Arguments: +# cmd1 - Command to execute when method is called. +# sleep1 - Ms to sleep after executing cmd1 before executing cmd2. +# cmd2 - Command to execute in the *next* invocation of this method. +# sleep2 - Ms to sleep after executing cmd2 before executing cmd1 again. + +def textToggle(cmd1,sleep1,cmd2,sleep2) + sleep_list = [sleep2, sleep1] + TkAfter.new(proc{sleep = sleep_list.shift; sleep_list.push(sleep); sleep}, + -1, cmd1, cmd2).start(sleep1) +end + +# toplevel widget +if defined?($search_demo) && $search_demo + $search_demo.destroy + $search_demo = nil +end + +# demo toplevel widget +$search_demo = TkToplevel.new {|w| + title("Text Demonstration - Search and Highlight") + iconname("search") + positionWindow(w) +} + +# frame +$search_buttons = TkFrame.new($search_demo) {|frame| + TkButton.new(frame) { + text 'Dismiss' + command proc{ + tmppath = $search_demo + $search_demo = nil + tmppath.destroy + } + }.pack('side'=>'left', 'expand'=>'yes') + + TkButton.new(frame) { + text 'Show Code' + command proc{showCode 'search'} + }.pack('side'=>'left', 'expand'=>'yes') +} +$search_buttons.pack('side'=>'bottom', 'fill'=>'x', 'pady'=>'2m') + +# frame +TkFrame.new($search_demo) {|f| + TkLabel.new(f, 'text'=>'File name:', + 'width'=>13, 'anchor'=>'w').pack('side'=>'left') + $search_fileName = TkVariable.new + TkEntry.new(f, 'width'=>40, + 'textvariable'=>$search_fileName) { + pack('side'=>'left') + bind('Return', proc{textLoadFile($search_text, $search_fileName.value) + $search_string_entry.focus}) + focus + } + TkButton.new(f, 'text'=>'Load File', + 'command'=>proc{textLoadFile($search_text, + $search_fileName.value)})\ + .pack('side'=>'left', 'pady'=>5, 'padx'=>10) +}.pack('side'=>'top', 'fill'=>'x') + +TkFrame.new($search_demo) {|f| + TkLabel.new(f, 'text'=>'Search string:', + 'width'=>13, 'anchor'=>'w').pack('side'=>'left') + $search_searchString = TkVariable.new + $search_string_entry = TkEntry.new(f, 'width'=>40, + 'textvariable'=>$search_searchString) { + pack('side'=>'left') + bind('Return', proc{textSearch($search_text, $search_searchString.value, + $search_Tag)}) + } + TkButton.new(f, 'text'=>'Highlight', + 'command'=>proc{textSearch($search_text, + $search_searchString.value, + $search_Tag)}) { + pack('side'=>'left', 'pady'=>5, 'padx'=>10) + } +}.pack('side'=>'top', 'fill'=>'x') + +$search_text = TkText.new($search_demo, 'setgrid'=>true, 'wrap'=>'word') {|t| + $search_Tag = TkTextTag.new(t) + TkScrollbar.new($search_demo, 'command'=>proc{|*args| t.yview(*args)}) {|sc| + t.yscrollcommand(proc{|first,last| sc.set first,last}) + pack('side'=>'right', 'fill'=>'y') + } + pack('expand'=>'yes', 'fill'=>'both') +} + +# Set up display styles for text highlighting. + +if TkWinfo.depth($search_demo) > 1 + textToggle(proc{ + $search_Tag.configure('background'=>'#ce5555', + 'foreground'=>'white') + }, + 800, + proc{ + $search_Tag.configure('background'=>'', 'foreground'=>'') + }, + 200 ) +else + textToggle(proc{ + $search_Tag.configure('background'=>'black', + 'foreground'=>'white') + }, + 800, + proc{ + $search_Tag.configure('background'=>'', 'foreground'=>'') + }, + 200 ) +end +$search_text.insert('1.0', "\ +This window demonstrates how to use the tagging facilities in text \ +widgets to implement a searching mechanism. First, type a file name \ +in the top entry, then type <Return> or click on \"Load File\". Then \ +type a string in the lower entry and type <Return> or click on \ +\"Load File\". This will cause all of the instances of the string to \ +be tagged with the tag \"search\", and it will arrange for the tag\'s \ +display attributes to change to make all of the strings blink.") +$search_text.set_insert '0.0' + +$search_fileName.value = '' +$search_searchString.value = '' + |