text.c

nedit 是一款linux下的开发源码的功能强大的编辑器

       splitting windows on Linux 2.0 systems (same Motif, why the change in
       behavior?), causes one or two resize calls with < 1 line of height.
       Fixing it here is 100x easier than re-designing textDisp.c */
    if (w->text.columns < 1) {
    	w->text.columns = 1;
    	w->core.width = width = fs->max_bounds.width + marginWidth*2 +
		lineNumAreaWidth;
    }
    if (w->text.rows < 1) {
    	w->text.rows = 1;
    	w->core.height = height = fs->ascent + fs->descent + marginHeight*2;
    }
    
    /* Resize the text display that the widget uses to render text */
    TextDResize(w->text.textD, width - marginWidth*2 - lineNumAreaWidth,
	    height - marginHeight*2);
    
    /* if the window became shorter or narrower, there may be text left
       in the bottom or right margin area, which must be cleaned up */
    if (XtIsRealized((Widget)w)) {
	XClearArea(XtDisplay(w), XtWindow(w), 0, height-marginHeight,
    		width, marginHeight, False);
	XClearArea(XtDisplay(w), XtWindow(w),width-marginWidth,
		0, marginWidth, height, False);
    }
}

/*
** Widget redisplay method
*/
static void redisplay(TextWidget w, XEvent *event, Region region)
{
    XExposeEvent *e = &event->xexpose;
    
    TextDRedisplayRect(w->text.textD, e->x, e->y, e->width, e->height);
}

static Bool findGraphicsExposeOrNoExposeEvent(Display *theDisplay, XEvent *event, XPointer arg)
{
    if ((theDisplay == event->xany.display) && 
        (event->type == GraphicsExpose || event->type == NoExpose) &&
        ((Widget)arg == XtWindowToWidget(event->xany.display, event->xany.window))) {
        return(True);
    }
    else {
        return(False);
    }
}

static void adjustRectForGraphicsExposeOrNoExposeEvent(TextWidget w, XEvent *event,
                            Boolean *first, int *left, int *top, int *width, int *height)
{
    Boolean removeQueueEntry = False;
    
    if (event->type == GraphicsExpose) {
        XGraphicsExposeEvent *e = &event->xgraphicsexpose;
        int x = e->x, y = e->y;

        TextDImposeGraphicsExposeTranslation(w->text.textD, &x, &y);
        if (*first) {
            *left = x;
            *top = y;
            *width = e->width;
            *height = e->height;
            
            *first = False;
        }
        else {
            int prev_left = *left;
            int prev_top = *top;
            
            *left = min(*left, x);
            *top = min(*top, y);
            *width = max(prev_left + *width, x + e->width) - *left;
            *height = max(prev_top + *height, y + e->height) - *top;
        }
        if (e->count == 0) {
            removeQueueEntry = True;
        }
    }
    else if (event->type == NoExpose) {
        removeQueueEntry = True;
    }
    if (removeQueueEntry) {
        TextDPopGraphicExposeQueueEntry(w->text.textD);
    }
}

static void redisplayGE(TextWidget w, XtPointer client_data,
                    XEvent *event, Boolean *continue_to_dispatch_return)
{
    if (event->type == GraphicsExpose || event->type == NoExpose) {
        HandleAllPendingGraphicsExposeNoExposeEvents(w, event);
    }
}

void HandleAllPendingGraphicsExposeNoExposeEvents(TextWidget w, XEvent *event)
{
    XEvent foundEvent;
    int left;
    int top;
    int width;
    int height;
    Boolean invalidRect = True;

    if (event) {
        adjustRectForGraphicsExposeOrNoExposeEvent(w, event, &invalidRect, &left, &top, &width, &height);
    }
    while (XCheckIfEvent(XtDisplay(w), &foundEvent, findGraphicsExposeOrNoExposeEvent, (XPointer)w)) {
        adjustRectForGraphicsExposeOrNoExposeEvent(w, &foundEvent, &invalidRect, &left, &top, &width, &height);
    }
    if (!invalidRect) {
        TextDRedisplayRect(w->text.textD, left, top, width, height);
    }
}

/*
** Widget setValues method
*/
static Boolean setValues(TextWidget current, TextWidget request,
	TextWidget new)
{
    Boolean redraw = False, reconfigure = False;
    
    if (new->text.overstrike != current->text.overstrike) {
    	if (current->text.textD->cursorStyle == BLOCK_CURSOR)
    	    TextDSetCursorStyle(current->text.textD,
    	    	    current->text.heavyCursor ? HEAVY_CURSOR : NORMAL_CURSOR);
    	else if (current->text.textD->cursorStyle == NORMAL_CURSOR ||
    		current->text.textD->cursorStyle == HEAVY_CURSOR)
    	    TextDSetCursorStyle(current->text.textD, BLOCK_CURSOR);
    }
    
    if (new->text.fontStruct != current->text.fontStruct) {
	if (new->text.lineNumCols != 0)
	    reconfigure = True;
    	TextDSetFont(current->text.textD, new->text.fontStruct);
    }
    
    if (new->text.wrapMargin != current->text.wrapMargin ||
    	    new->text.continuousWrap != current->text.continuousWrap)
    	TextDSetWrapMode(current->text.textD, new->text.continuousWrap,
    	    	new->text.wrapMargin);
    
    /* When delimiters are changed, copy the memory, so that the caller
       doesn't have to manage it, and add mandatory delimiters blank,
       tab, and newline to the list */
    if (new->text.delimiters != current->text.delimiters) {
	char *delimiters = XtMalloc(strlen(new->text.delimiters) + 4);
    	XtFree(current->text.delimiters);
	sprintf(delimiters, "%s%s", " \t\n", new->text.delimiters);
	new->text.delimiters = delimiters;
    }
    
    /* Setting the lineNumCols resource tells the text widget to hide or
       show, or change the number of columns of the line number display,
       which requires re-organizing the x coordinates of both the line
       number display and the main text display */
    if (new->text.lineNumCols != current->text.lineNumCols || reconfigure)
    {
        int marginWidth = new->text.marginWidth;
        int charWidth = new->text.fontStruct->max_bounds.width;
        int lineNumCols = new->text.lineNumCols;
        if (lineNumCols == 0)
        {
            TextDSetLineNumberArea(new->text.textD, 0, 0, marginWidth);
            new->text.columns = (new->core.width - marginWidth*2) / charWidth;
        } else
        {
            TextDSetLineNumberArea(new->text.textD, marginWidth,
                    charWidth * lineNumCols,
                    2*marginWidth + charWidth * lineNumCols);
            new->text.columns = (new->core.width - marginWidth*3 - charWidth
                    * lineNumCols) / charWidth;
        }
    }

    if (new->text.backlightCharTypes != current->text.backlightCharTypes)
    {
        TextDSetupBGClasses((Widget)new, new->text.backlightCharTypes,
                &new->text.textD->bgClassPixel, &new->text.textD->bgClass,
                new->text.textD->bgPixel);
        redraw = True;
    }
    
    return redraw;
} 

/*
** Widget realize method
*/
static void realize(Widget w, XtValueMask *valueMask,
	XSetWindowAttributes *attributes)
{
    /* Set bit gravity window attribute.  This saves a full blank and redraw
       on window resizing */
    *valueMask |= CWBitGravity;
    attributes->bit_gravity = NorthWestGravity;
        
    /* Continue with realize method from superclass */
    (xmPrimitiveClassRec.core_class.realize)(w, valueMask, attributes);
}

/*
** Widget query geometry method ... unless asked to negotiate a different size simply return current size.
*/
static XtGeometryResult queryGeometry(Widget w, XtWidgetGeometry *proposed,
	XtWidgetGeometry *answer)
{
    TextWidget tw = (TextWidget)w;
    
    int curHeight = tw->core.height;
    int curWidth = tw->core.width;
    XFontStruct *fs = tw->text.textD->fontStruct;
    int fontWidth = fs->max_bounds.width;
    int fontHeight = fs->ascent + fs->descent;
    int marginHeight = tw->text.marginHeight;
    int propWidth = (proposed->request_mode & CWWidth) ? proposed->width : 0;
    int propHeight = (proposed->request_mode & CWHeight) ? proposed->height : 0;
    
    answer->request_mode = CWHeight | CWWidth;
    
    if(proposed->request_mode & CWWidth)
       /* Accept a width no smaller than 10 chars */
       answer->width = max(fontWidth * 10, proposed->width);
    else
       answer->width = curWidth;
    
    if(proposed->request_mode & CWHeight)
       /* Accept a height no smaller than an exact multiple of the line height
          and at least one line high */
       answer->height = max(1, ((propHeight - 2*marginHeight) / fontHeight)) *
    	    fontHeight + 2*marginHeight;
    else
       answer->height = curHeight;
    
    /*printf("propWidth %d, propHeight %d, ansWidth %d, ansHeight %d\n",
    	    propWidth, propHeight, answer->width, answer->height);*/
    if (propWidth == answer->width && propHeight == answer->height)
    	return XtGeometryYes;
    else if (answer->width == curWidth && answer->height == curHeight)
    	return XtGeometryNo;
    else
    	return XtGeometryAlmost;
}
    
/*
** Set the text buffer which this widget will display and interact with.
** The currently attached buffer is automatically freed, ONLY if it has
** no additional modify procs attached (as it would if it were being
** displayed by another text widget).
*/
void TextSetBuffer(Widget w, textBuffer *buffer)
{
    textBuffer *oldBuf = ((TextWidget)w)->text.textD->buffer;
    
    StopHandlingXSelections(w);
    TextDSetBuffer(((TextWidget)w)->text.textD, buffer);
    if (oldBuf->nModifyProcs == 0)
    	BufFree(oldBuf);
}

/*
** Get the buffer associated with this text widget.  Note that attaching
** additional modify callbacks to the buffer will prevent it from being
** automatically freed when the widget is destroyed.
*/
textBuffer *TextGetBuffer(Widget w)
{
    return ((TextWidget)w)->text.textD->buffer;
}

/*
** Translate a line number and column into a position
*/
int TextLineAndColToPos(Widget w, int lineNum, int column)
{
    return TextDLineAndColToPos(((TextWidget)w)->text.textD, lineNum, column );
}

/*
** Translate a position into a line number (if the position is visible,
** if it's not, return False
*/
int TextPosToLineAndCol(Widget w, int pos, int *lineNum, int *column)
{
    return TextDPosToLineAndCol(((TextWidget)w)->text.textD, pos, lineNum,
    	    column);
}

/*
** Translate a buffer text position to the XY location where the center
** of the cursor would be positioned to point to that character.  Returns
** False if the position is not displayed because it is VERTICALLY out
** of view.  If the position is horizontally out of view, returns the
** x coordinate where the position would be if it were visible.
*/
int TextPosToXY(Widget w, int pos, int *x, int *y)
{
    return TextDPositionToXY(((TextWidget)w)->text.textD, pos, x, y);
}

/*
** Return the cursor position
*/
int TextGetCursorPos(Widget w)
{
    return TextDGetInsertPosition(((TextWidget)w)->text.textD);
}

/*
** Set the cursor position
*/
void TextSetCursorPos(Widget w, int pos)
{
    TextDSetInsertPosition(((TextWidget)w)->text.textD, pos);
    checkAutoShowInsertPos(w);
    callCursorMovementCBs(w, NULL);

}

/*
** Return the horizontal and vertical scroll positions of the widget
*/
void TextGetScroll(Widget w, int *topLineNum, int *horizOffset)