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richmemo: gtk2 numbering - erasing with backspace

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git-svn-id: https://svn.code.sf.net/p/lazarus-ccr/svn@3853 8e941d3f-bd1b-0410-a28a-d453659cc2b4
This commit is contained in:
skalogryz
2014-12-25 18:56:43 +00:00
parent c6d23a2712
commit cd6fad17f3
1 changed files with 40 additions and 1 deletions
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41
components/richmemo/gtk2/gtk2richmemo.pas
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@ -150,7 +150,10 @@ var
begin
tag := gtk_text_tag_table_lookup( gtk_text_buffer_get_tag_table(TextBuffer)
, TagNameNumeric);
// navigate "through" numbering characters
if gtk_text_iter_has_tag( StartIter, tag) then begin
// if tried to move at the "endo
if gtk_text_iter_begins_tag(StartIter, tag) then begin
gtk_text_iter_forward_to_tag_toggle(StartIter, nil);
gtk_text_buffer_move_mark(TextBuffer, mark, StartIter);
@ -207,14 +210,50 @@ begin
end;
end;
procedure Gtk2WS_Backspace(view: PGtkTextView; WidgetInfo: PWidgetInfo); cdecl;
var
buf : PGtkTextBuffer;
mark : PGtkTextMark;
iend : TGtkTextIter;
istart : TGtkTextIter;
tag : PGtkTextTag;
begin
// this handler checks, if the "numbering" should be erarsed
buf:=gtk_text_view_get_buffer(view);
if not Assigned(buf) then Exit;
mark := gtk_text_buffer_get_mark(buf, 'insert');
if not Assigned(mark) then Exit;
tag := gtk_text_tag_table_lookup( gtk_text_buffer_get_tag_table(buf)
, TagNameNumeric);
if not Assigned(tag) then Exit;
// first, check if cursor is right "after" the "numbering characters"
gtk_text_buffer_get_iter_at_mark(buf, @iend, mark);
if gtk_text_iter_ends_tag(@iend, tag) then begin
// cursor position is at the beginning of the line - erase all
// characters that belong to the numbering.
istart:=iend;
gtk_text_iter_backward_to_tag_toggle(@istart, tag);
gtk_text_buffer_delete(buf, @istart, @iend);
// prevent default backspace
g_signal_stop_emission_by_name(view, 'backspace');
end;
end;
class procedure TGtk2WSCustomRichMemo.SetCallbacks(
const AGtkWidget: PGtkWidget; const AWidgetInfo: PWidgetInfo);
var
TextBuf: PGtkTextBuffer;
view : PGtkTextView;
begin
TGtk2WSCustomMemoInt.SetCallbacks(AGtkWidget, AWidgetInfo);
TextBuf := gtk_text_view_get_buffer(PGtkTextView(AWidgetInfo^.CoreWidget));
view:=PGtkTextView(AWidgetInfo^.CoreWidget);
TextBuf := gtk_text_view_get_buffer(view);
SignalConnect(PGtkWidget(view), 'backspace', @Gtk2WS_Backspace, AWidgetInfo);
SignalConnect(PGtkWidget(TextBuf), 'mark-set', @Gtk2WS_MemoSelChanged_Before, AWidgetInfo);
SignalConnectAfter(PGtkWidget(TextBuf), 'mark-set', @Gtk2WS_MemoSelChanged, AWidgetInfo);
SignalConnectAfter(PGtkWidget(TextBuf), 'insert-text', @Gtk2WS_RichMemoInsert, AWidgetInfo);