paint.c

winNT技术操作系统,国外开放的原代码和LIUX一样

/*
 * RichEdit - painting functions
 *
 * Copyright 2004 by Krzysztof Foltman
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "editor.h"

WINE_DEFAULT_DEBUG_CHANNEL(richedit);

void ME_PaintContent(ME_TextEditor *editor, HDC hDC, BOOL bOnlyNew, RECT *rcUpdate) {
  ME_DisplayItem *item;
  ME_Context c;
  int yoffset;

  editor->nSequence++;
  yoffset = ME_GetYScrollPos(editor);
  ME_InitContext(&c, editor, hDC);
  SetBkMode(hDC, TRANSPARENT);
  ME_MoveCaret(editor);
  item = editor->pBuffer->pFirst->next;
  c.pt.y -= yoffset;
  while(item != editor->pBuffer->pLast) {
    int ye;
    assert(item->type == diParagraph);
    ye = c.pt.y + item->member.para.nHeight;
    if (!bOnlyNew || (item->member.para.nFlags & MEPF_REPAINT))
    {
      BOOL bPaint = (rcUpdate == NULL);
      if (rcUpdate)
        bPaint = c.pt.y<rcUpdate->bottom && 
          c.pt.y+item->member.para.nHeight>rcUpdate->top;
      if (bPaint)
      {
        ME_DrawParagraph(&c, item);
        if (!rcUpdate || (rcUpdate->top<=c.pt.y && rcUpdate->bottom>=ye))
          item->member.para.nFlags &= ~MEPF_REPAINT;
      }
    }
    c.pt.y = ye;
    item = item->member.para.next_para;
  }
  if (c.pt.y<c.rcView.bottom) {
    RECT rc;
    int xs = c.rcView.left, xe = c.rcView.right;
    int ys = c.pt.y, ye = c.rcView.bottom;
    
    if (bOnlyNew)
    {
      int y1 = editor->nTotalLength-yoffset, y2 = editor->nLastTotalLength-yoffset;
      if (y1<y2)
        ys = y1, ye = y2+1;
      else
        ys = ye;
    }
    
    if (rcUpdate && ys!=ye)
    {
      xs = rcUpdate->left, xe = rcUpdate->right;
      if (rcUpdate->top > ys)
        ys = rcUpdate->top;
      if (rcUpdate->bottom < ye)
        ye = rcUpdate->bottom;
    }

    if (ye>ys) {
      rc.left = xs;
      rc.top = ys;
      rc.right = xe;
      rc.bottom = ye;
      FillRect(hDC, &rc, c.editor->hbrBackground);
    }
    if (ys == c.pt.y) /* don't overwrite the top bar */
      ys++;
  }
  if (editor->nTotalLength != editor->nLastTotalLength)
    ME_SendRequestResize(editor, FALSE);
  editor->nLastTotalLength = editor->nTotalLength;
  ME_DestroyContext(&c);
}

static void ME_MarkParagraphRange(ME_TextEditor *editor, ME_DisplayItem *p1,
                           ME_DisplayItem *p2, int nFlags)
{
  ME_DisplayItem *p3;  
  if (p1 == p2)
  {
    p1->member.para.nFlags |= nFlags;
    return;
  }
  if (p1->member.para.nCharOfs > p2->member.para.nCharOfs)
    p3 = p1, p1 = p2, p2 = p3;
    
  p1->member.para.nFlags |= nFlags;
  do {
    p1 = p1->member.para.next_para;
    p1->member.para.nFlags |= nFlags;
  } while (p1 != p2);
}

static void ME_MarkOffsetRange(ME_TextEditor *editor, int from, int to, int nFlags)
{
  ME_Cursor c1, c2;
  ME_CursorFromCharOfs(editor, from, &c1);
  ME_CursorFromCharOfs(editor, to, &c2);
  
  ME_MarkParagraphRange(editor, ME_GetParagraph(c1.pRun), ME_GetParagraph(c2.pRun), nFlags);
}

static void ME_MarkSelectionForRepaint(ME_TextEditor *editor)
{
  int from, to, from2, to2, end;
  
  end = ME_GetTextLength(editor);
  ME_GetSelection(editor, &from, &to);
  from2 = editor->nLastSelStart;
  to2 = editor->nLastSelEnd;
  if (from<from2) ME_MarkOffsetRange(editor, from, from2, MEPF_REPAINT);
  if (from>from2) ME_MarkOffsetRange(editor, from2, from, MEPF_REPAINT);
  if (to<to2) ME_MarkOffsetRange(editor, to, to2, MEPF_REPAINT);
  if (to>to2) ME_MarkOffsetRange(editor, to2, to, MEPF_REPAINT);

  editor->nLastSelStart = from;
  editor->nLastSelEnd = to;
}

void ME_Repaint(ME_TextEditor *editor)
{
  ME_Cursor *pCursor = &editor->pCursors[0];
  ME_DisplayItem *pRun = NULL;
  int nOffset = -1;
  HDC hDC;
  int nCharOfs = ME_CharOfsFromRunOfs(editor, pCursor->pRun, pCursor->nOffset);
  
  ME_RunOfsFromCharOfs(editor, nCharOfs, &pRun, &nOffset);
  assert(pRun == pCursor->pRun);
  assert(nOffset == pCursor->nOffset);
  ME_MarkSelectionForRepaint(editor);
  if (ME_WrapMarkedParagraphs(editor)) {
    ME_UpdateScrollBar(editor);
  }
  if (editor->bRedraw)
  {
    hDC = GetDC(editor->hWnd);
    ME_HideCaret(editor);
    ME_PaintContent(editor, hDC, TRUE, NULL);
    ReleaseDC(editor->hWnd, hDC);
    ME_ShowCaret(editor);
    ME_EnsureVisible(editor, pCursor->pRun);
  }
}

void ME_UpdateRepaint(ME_TextEditor *editor)
{
/*
  InvalidateRect(editor->hWnd, NULL, TRUE);
  */
  ME_SendOldNotify(editor, EN_CHANGE);
  ME_Repaint(editor);
  ME_SendOldNotify(editor, EN_UPDATE);
  ME_SendSelChange(editor);
}


void
ME_RewrapRepaint(ME_TextEditor *editor)
{
  ME_MarkAllForWrapping(editor);
  ME_WrapMarkedParagraphs(editor);
  ME_UpdateScrollBar(editor);
  ME_Repaint(editor);
}


static void ME_DrawTextWithStyle(ME_Context *c, int x, int y, LPCWSTR szText, int nChars, 
  ME_Style *s, int *width, int nSelFrom, int nSelTo, int ymin, int cy) {
  HDC hDC = c->hDC;
  HGDIOBJ hOldFont;
  COLORREF rgbOld, rgbBack;
  int yOffset = 0, yTwipsOffset = 0;
  hOldFont = ME_SelectStyleFont(c->editor, hDC, s);
  rgbBack = ME_GetBackColor(c->editor);
  if ((s->fmt.dwMask & CFM_COLOR) && (s->fmt.dwEffects & CFE_AUTOCOLOR))
    rgbOld = SetTextColor(hDC, GetSysColor(COLOR_WINDOWTEXT));
  else
    rgbOld = SetTextColor(hDC, s->fmt.crTextColor);
  if ((s->fmt.dwMask & s->fmt.dwEffects) & CFM_OFFSET) {
    yTwipsOffset = s->fmt.yOffset;
  }
  if ((s->fmt.dwMask & s->fmt.dwEffects) & (CFM_SUPERSCRIPT | CFM_SUBSCRIPT)) {
    if (s->fmt.dwEffects & CFE_SUPERSCRIPT) yTwipsOffset = s->fmt.yHeight/3;
    if (s->fmt.dwEffects & CFE_SUBSCRIPT) yTwipsOffset = -s->fmt.yHeight/12;
  }
  if (yTwipsOffset)
  {
    int numerator = 1;
    int denominator = 1;
    
    if (c->editor->nZoomNumerator)
    {
      numerator = c->editor->nZoomNumerator;
      denominator = c->editor->nZoomDenominator;
    }
    yOffset = yTwipsOffset * GetDeviceCaps(hDC, LOGPIXELSY) * numerator / denominator / 1440;
  }
  ExtTextOutW(hDC, x, y-yOffset, 0, NULL, szText, nChars, NULL);
  if (width) {
    SIZE sz;
    GetTextExtentPoint32W(hDC, szText, nChars, &sz);
    *width = sz.cx;
  }
  if (nSelFrom < nChars && nSelTo >= 0 && nSelFrom<nSelTo)
  {
    SIZE sz;
    if (nSelFrom < 0) nSelFrom = 0;
    if (nSelTo > nChars) nSelTo = nChars;
    GetTextExtentPoint32W(hDC, szText, nSelFrom, &sz);
    x += sz.cx;
    GetTextExtentPoint32W(hDC, szText+nSelFrom, nSelTo-nSelFrom, &sz);
    PatBlt(hDC, x, ymin, sz.cx, cy, DSTINVERT);
  }
  SetTextColor(hDC, rgbOld);
  ME_UnselectStyleFont(c->editor, hDC, s, hOldFont);
}

static void ME_DebugWrite(HDC hDC, POINT *pt, WCHAR *szText) {
  int align = SetTextAlign(hDC, TA_LEFT|TA_TOP);
  HGDIOBJ hFont = SelectObject(hDC, GetStockObject(DEFAULT_GUI_FONT));
  COLORREF color = SetTextColor(hDC, RGB(128,128,128));
  TextOutW(hDC, pt->x, pt->y, szText, lstrlenW(szText));
  SelectObject(hDC, hFont);
  SetTextAlign(hDC, align);
  SetTextColor(hDC, color);
}

void ME_DrawGraphics(ME_Context *c, int x, int y, ME_Run *run, 
                     ME_Paragraph *para, BOOL selected) {
  SIZE sz;
  int xs, ys, xe, ye, h, ym, width, eyes;
  ME_GetGraphicsSize(c->editor, run, &sz);
  xs = run->pt.x;
  ys = y-sz.cy;
  xe = xs+sz.cx;
  ye = y;
  h = ye-ys;
  ym = ys+h/4;
  width = sz.cx;
  eyes = width/8;
  /* draw a smiling face :) */
  Ellipse(c->hDC, xs, ys, xe, ye);
  Ellipse(c->hDC, xs+width/8, ym, x+width/8+eyes, ym+eyes);
  Ellipse(c->hDC, xs+7*width/8-eyes, ym, xs+7*width/8, ym+eyes);
  MoveToEx(c->hDC, xs+width/8, ys+3*h/4-eyes, NULL);
  LineTo(c->hDC, xs+width/8, ys+3*h/4);
  LineTo(c->hDC, xs+7*width/8, ys+3*h/4);
  LineTo(c->hDC, xs+7*width/8, ys+3*h/4-eyes);
  if (selected)