覆蓋onDraw時不顯示EditText光標

Question

爲了突出語法的目的，我已經在CustomEditText中覆蓋了onDraw，並嘗試使用畫布顏色而不是跨度（太慢）進行繪製。由於未調用super.onDraw（），所以遊標不再可見。是否可以顯示光標？

Answer 1

我的解決方案是用默認的渲染器繪製屏幕，​​然後用適當的顏色重畫。訣竅是調用super.onDraw mid方法。有關信息，我正在使用920-Text-Editor-master中的庫libhighlight.so。代碼仍然需要工作，但我對結果感到滿意。

Highlight highlighter = new Highlight(); 

    @Override 
    public void onDraw(final Canvas canvas) 
    { 
     int currentLine = getLayout().getLineForOffset(getSelectionStart());  
     int firstVisibleLineNumber = getLayout().getLineForVertical(getScrollY()); 
     int lastVisibleLineNumber = getLayout().getLineForVertical(getScrollY() + getHeight()); 
     int charWidth = (int) getPaint().measureText("8"); 

     for (int line = firstVisibleLineNumber; line < lastVisibleLineNumber; line++) 
     { 
      if (line == currentLine) 
      { 
       Rect r = new Rect(); 
       getLineBounds(line, r); 
       canvas.drawRect(r, bgndPaint); 
      } 

      canvas.drawText(String.valueOf(line + 1), 
          5, 
          getLineBounds(line, null), 
          paintNumbers); 
     } 


     canvas.save(); 
     super.onDraw(canvas); 
     canvas.restore(); 

     if (showSyntax == true) 
     { 
      int ret[] = highlighter.parse(getText().toString(), "/storage/emulated/0/projects/myIde/assets/html.conf"); 
      int spanQty = ret.length; 
      if (spanQty < 1 || spanQty % 3.0F != 0) 
      { 
       return; 
      } 

      int styleQty = getText().toString().length(); 
      int[] style = new int[styleQty]; 
      for (int a = 0; a < styleQty;++a) 
       style[a] = 0; 

      for (int i = 0; i < spanQty; i++) 
      { 
       int group = ret[i]; 
       int start = ret[++i]; 
       int end = ret[++i]; 

       int color = textColor; 

       switch (group) 
       { 
        case Highlight.GROUP_TAG_ID: 
         color = colorKeyword; 
         break; 

        case Highlight.GROUP_STRING_ID: 
         color = colorString; 
         break; 

        case Highlight.GROUP_KEYWORD_ID: 
         break; 

        case Highlight.GROUP_FUNCTION_ID: 
         break; 

        case Highlight.GROUP_COMMENT_ID: 
         color = colorComments; 
         break; 

        case Highlight.GROUP_ATTR_NAME_ID: 
         color = colorColor1; 
         break; 

        default: 
         continue; 
       } 

       for (int c = start; c < end; ++c) 
       { 
        style[c] = color; 
       } 
      } 


      for (int line = firstVisibleLineNumber; line < lastVisibleLineNumber; line++) 
      { 
       int start = getLayout().getLineStart(line); 
       int end = getLayout().getLineEnd(line); 

       String text = getText().toString().substring(start, end); 

       for (int i = 0; i < text.length(); ++i) 
       { 
        String c = text.substring(i, i + 1); 

        if (style[start + i] != 0) 
        { 
         getPaint().setColor(style[start + i]); 
         canvas.drawText(c, getPaddingLeft() + (i * charWidth), getLineBounds(line, null), getPaint()); 
        } 
       } 
      } 
     } 
    }