SWT StyledText - Comment mettre en retrait/masquer le texte sélectionné avec l'onglet ou les touches Maj + Tab

Question

À l'aide du widget Eclipse SWT StyledText, comment pouvez-vous mettre en retrait/décocher un bloc de texte sélectionné à l'aide des touches tabulation ou Maj + tabulation ?

Answer 1

Cela semble faire l'affaire ...

protected Control createContents(Composite parent){ 
    ...... 
    //add the listeners... 
    text_code_impl.addVerifyKeyListener(new VerifyKeyListener() { 
     public void verifyKey(VerifyEvent e) { 
      if (e.keyCode == SWT.TAB) { 
       if ((e.stateMask & SWT.SHIFT) != 0){ 
        e.doit = text_code_impl_shift_tab_pressed(); 
       } else { 
        e.doit = text_code_impl_tab_pressed(); 
       } 
      } 
     } 
    });   
    text_code_impl.addTraverseListener(new TraverseListener() { 
     public void keyTraversed(TraverseEvent e) { 
      if (e.detail == SWT.TRAVERSE_TAB_PREVIOUS) { 
       e.doit = false; //allows verifyKey listener to fire 
      } 
     } 
    }); 
} 

boolean text_code_impl_tab_pressed() 
{ 
    if (text_code_impl.getSelectionText().equals("")){ 
     return true; 
    } 

    Point range = text_code_impl.getSelectionRange(); 
    int start = range.x; 
    int length = text_code_impl.getSelectionCount(); 

    String txt = text_code_impl.getText(); 
    while (start > 0 && txt.charAt(start-1) != '\n') { 
     start--; 
     length++; 
    } 

    int replace_length = length; 
    text_code_impl.setSelectionRange(start, length); 
    text_code_impl.showSelection(); 

    String sel_text = text_code_impl.getSelectionText(); 
    String[] lines = sel_text.split("\n"); 
    String new_text = ""; 

    for (int x=0; x < lines.length; x++){ 
     if (x > 0){ 
      new_text += '\n'; 
     } 
     new_text += '\t'; 
     length++; 
     new_text += lines[x]; 
    } 

    text_code_impl.replaceTextRange(start, replace_length, new_text); 
    text_code_impl.setSelectionRange(start, length); 
    text_code_impl.showSelection(); 

    return false; 
} 

boolean text_code_impl_shift_tab_pressed() 
{ 
    if (text_code_impl.getSelectionText().equals("")){ 
     return true; 
    } 

    Point range = text_code_impl.getSelectionRange(); 
    int start = range.x; 
    int length = text_code_impl.getSelectionCount(); 

    String txt = text_code_impl.getText(); 
    while (start > 0 && txt.charAt(start-1) != '\n') { 
     --start; 
     ++length; 
    } 

    int replace_length = length;   
    text_code_impl.setSelectionRange(start, length); 
    text_code_impl.showSelection(); 

    String sel_text = text_code_impl.getSelectionText(); 
    String[] lines = sel_text.split("\n"); 
    String new_text = ""; 

    for (int x=0; x < lines.length; x++){ 
     if (x > 0){ 
      new_text += '\n'; 
     } 
     if (lines[x].charAt(0) == '\t'){ 
      new_text += lines[x].substring(1); 
      length--; 
     } else if (lines[x].startsWith(" ")){ 
      new_text += lines[x].substring(1); 
      length--; 
     } else { 
      new_text += lines[x]; 
     } 
    } 

    text_code_impl.replaceTextRange(start, replace_length, new_text); 
    text_code_impl.setSelectionRange(start, length); 
    text_code_impl.showSelection(); 

    return false; 
}