textbox.c

DOS下Editor的源代码

/* ------------- textbox.c ------------ */

#include "dflat.h"

static void ComputeWindowTop(WINDOW);
static void ComputeWindowLeft(WINDOW);
static int ComputeVScrollBox(WINDOW);
static int ComputeHScrollBox(WINDOW);
static void MoveScrollBox(WINDOW, int);
static char *GetTextLine(WINDOW, int);

BOOL VSliding;
BOOL HSliding;

/* ------------ ADDTEXT Message -------------- */
static BOOL AddTextMsg(WINDOW wnd, char *txt)
{
    /* --- append text to the textbox's buffer --- */
    unsigned adln = strlen(txt);
    if (adln > (unsigned)0xfff0)
        return FALSE;
    if (wnd->text != NULL)    {
        /* ---- appending to existing text ---- */
        unsigned txln = strlen(wnd->text);
        if ((long)txln+adln > (unsigned) 0xfff0)
            return FALSE;
        if (txln+adln > wnd->textlen)    {
            wnd->text = DFrealloc(wnd->text, txln+adln+3);
            wnd->textlen = txln+adln+1;
        }
    }
    else    {
        /* ------ 1st text appended ------ */
        wnd->text = DFcalloc(1, adln+3);
        wnd->textlen = adln+1;
    }
	wnd->TextChanged = TRUE;
    if (wnd->text != NULL)    {
        /* ---- append the text ---- */
        strcat(wnd->text, txt);
        strcat(wnd->text, "\n");
        BuildTextPointers(wnd);
		return TRUE;
    }
	return FALSE;
}

/* ------------ DELETETEXT Message -------------- */
static void DeleteTextMsg(WINDOW wnd, int lno)
{
	char *cp1 = TextLine(wnd, lno);
	--wnd->wlines;
	if (lno == wnd->wlines)
		*cp1 = '\0';
	else 	{
		char *cp2 = TextLine(wnd, lno+1);
		memmove(cp1, cp2, strlen(cp2)+1);
	}
    BuildTextPointers(wnd);
}

/* ------------ INSERTTEXT Message -------------- */
static void InsertTextMsg(WINDOW wnd, char *txt, int lno)
{
	if (AddTextMsg(wnd, txt))	{
		int len = strlen(txt)+1;
		char *cp2 = TextLine(wnd, lno);
		char *cp1 = cp2+len;
		memmove(cp1, cp2, strlen(cp2)-len);
		strcpy(cp2, txt);
		*(cp2+len-1) = '\n';
	    BuildTextPointers(wnd);
		wnd->TextChanged = TRUE;
	}
}

/* ------------ SETTEXT Message -------------- */
static void SetTextMsg(WINDOW wnd, char *txt)
{
    /* -- assign new text value to textbox buffer -- */
    unsigned int len = strlen(txt)+1;
	SendMessage(wnd, CLEARTEXT, 0, 0);
    wnd->textlen = len;
    wnd->text=DFrealloc(wnd->text, len+1);
    wnd->text[len] = '\0';
    strcpy(wnd->text, txt);
    BuildTextPointers(wnd);
}

/* ------------ CLEARTEXT Message -------------- */
static void ClearTextMsg(WINDOW wnd)
{
    /* ----- clear text from textbox ----- */
    if (wnd->text != NULL)
        free(wnd->text);
    wnd->text = NULL;
    wnd->textlen = 0;
    wnd->wlines = 0;
    wnd->textwidth = 0;
    wnd->wtop = wnd->wleft = 0;
    ClearTextBlock(wnd);
    ClearTextPointers(wnd);
}

/* ------------ KEYBOARD Message -------------- */
static int KeyboardMsg(WINDOW wnd, PARAM p1)
{
    switch ((int) p1)    {
        case UP:
            return SendMessage(wnd,SCROLL,FALSE,0);
        case DN:
            return SendMessage(wnd,SCROLL,TRUE,0);
        case FWD:
            return SendMessage(wnd,HORIZSCROLL,TRUE,0);
        case BS:
            return SendMessage(wnd,HORIZSCROLL,FALSE,0);
        case PGUP:
            return SendMessage(wnd,SCROLLPAGE,FALSE,0);
        case PGDN:
            return SendMessage(wnd,SCROLLPAGE,TRUE,0);
        case CTRL_PGUP:
            return SendMessage(wnd,HORIZPAGE,FALSE,0);
        case CTRL_PGDN:
            return SendMessage(wnd,HORIZPAGE,TRUE,0);
        case HOME:
            return SendMessage(wnd,SCROLLDOC,TRUE,0);
        case END:
            return SendMessage(wnd,SCROLLDOC,FALSE,0);
        default:
            break;
    }
    return FALSE;
}

/* ------------ LEFT_BUTTON Message -------------- */
static int LeftButtonMsg(WINDOW wnd, PARAM p1, PARAM p2)
{
    int mx = (int) p1 - GetLeft(wnd);
    int my = (int) p2 - GetTop(wnd);
    if (TestAttribute(wnd, VSCROLLBAR) &&
                        mx == WindowWidth(wnd)-1)    {
        /* -------- in the right border ------- */
        if (my == 0 || my == ClientHeight(wnd)+1)
            /* --- above or below the scroll bar --- */
            return FALSE;
        if (my == 1)
            /* -------- top scroll button --------- */
            return SendMessage(wnd, SCROLL, FALSE, 0);
        if (my == ClientHeight(wnd))
            /* -------- bottom scroll button --------- */
            return SendMessage(wnd, SCROLL, TRUE, 0);
        /* ---------- in the scroll bar ----------- */
        if (!VSliding && my-1 == wnd->VScrollBox)    {
            RECT rc;
            VSliding = TRUE;
            rc.lf = rc.rt = GetRight(wnd);
            rc.tp = GetTop(wnd)+2;
            rc.bt = GetBottom(wnd)-2;
            return SendMessage(NULL, MOUSE_TRAVEL,
                (PARAM) &rc, 0);
        }
        if (my-1 < wnd->VScrollBox)
            return SendMessage(wnd,SCROLLPAGE,FALSE,0);
        if (my-1 > wnd->VScrollBox)
            return SendMessage(wnd,SCROLLPAGE,TRUE,0);
    }
    if (TestAttribute(wnd, HSCROLLBAR) &&
                        my == WindowHeight(wnd)-1) {
        /* -------- in the bottom border ------- */
        if (mx == 0 || my == ClientWidth(wnd)+1)
            /* ------  outside the scroll bar ---- */
            return FALSE;
        if (mx == 1)
            return SendMessage(wnd, HORIZSCROLL,FALSE,0);
        if (mx == WindowWidth(wnd)-2)
            return SendMessage(wnd, HORIZSCROLL,TRUE,0);
        if (!HSliding && mx-1 == wnd->HScrollBox)    {
            /* --- hit the scroll box --- */
            RECT rc;
            rc.lf = GetLeft(wnd)+2;
            rc.rt = GetRight(wnd)-2;
            rc.tp = rc.bt = GetBottom(wnd);
            /* - keep the mouse in the scroll bar - */
            SendMessage(NULL,MOUSE_TRAVEL,(PARAM)&rc,0);
            HSliding = TRUE;
            return TRUE;
        }
        if (mx-1 < wnd->HScrollBox)
            return SendMessage(wnd,HORIZPAGE,FALSE,0);
        if (mx-1 > wnd->HScrollBox)
            return SendMessage(wnd,HORIZPAGE,TRUE,0);
    }
    return FALSE;
}

/* ------------ MOUSE_MOVED Message -------------- */
static BOOL MouseMovedMsg(WINDOW wnd, PARAM p1, PARAM p2)
{
    int mx = (int) p1 - GetLeft(wnd);
    int my = (int) p2 - GetTop(wnd);
    if (VSliding)    {
        /* ---- dragging the vertical scroll box --- */
        if (my-1 != wnd->VScrollBox)    {
            foreground = FrameForeground(wnd);
            background = FrameBackground(wnd);
            wputch(wnd, SCROLLBARCHAR, WindowWidth(wnd)-1,
                    wnd->VScrollBox+1);
            wnd->VScrollBox = my-1;
            wputch(wnd, SCROLLBOXCHAR, WindowWidth(wnd)-1,
                    my);
        }
        return TRUE;
    }
    if (HSliding)    {
        /* --- dragging the horizontal scroll box --- */
        if (mx-1 != wnd->HScrollBox)    {
            foreground = FrameForeground(wnd);
            background = FrameBackground(wnd);
            wputch(wnd, SCROLLBARCHAR, wnd->HScrollBox+1,
                    WindowHeight(wnd)-1);
            wnd->HScrollBox = mx-1;
            wputch(wnd, SCROLLBOXCHAR, mx, WindowHeight(wnd)-1);
        }
        return TRUE;
    }
    return FALSE;
}

/* ------------ BUTTON_RELEASED Message -------------- */
static void ButtonReleasedMsg(WINDOW wnd)
{
    if (HSliding || VSliding)    {
        /* release the mouse ouside the scroll bar */
        SendMessage(NULL, MOUSE_TRAVEL, 0, 0);
        VSliding ? ComputeWindowTop(wnd):ComputeWindowLeft(wnd);
        SendMessage(wnd, PAINT, 0, 0);
        SendMessage(wnd, KEYBOARD_CURSOR, 0, 0);
        VSliding = HSliding = FALSE;
    }
}

/* ------------ SCROLL Message -------------- */
static BOOL ScrollMsg(WINDOW wnd, PARAM p1)
{
    /* ---- vertical scroll one line ---- */
    if (p1)    {
        /* ----- scroll one line up ----- */
        if (wnd->wtop+ClientHeight(wnd) >= wnd->wlines)
            return FALSE;
        wnd->wtop++;
    }
    else    {
        /* ----- scroll one line down ----- */
        if (wnd->wtop == 0)
            return FALSE;
        --wnd->wtop;
    }
    if (isVisible(wnd))    {
        RECT rc;
        rc = ClipRectangle(wnd, ClientRect(wnd));
        if (ValidRect(rc))    {
            /* ---- scroll the window ----- */
            if (wnd != inFocus)
                SendMessage(wnd, PAINT, 0, 0);
            else    {
                scroll_window(wnd, rc, (int)p1);
                if (!(int)p1)
                    /* -- write top line (down) -- */
                    WriteTextLine(wnd,NULL,wnd->wtop,FALSE);
                else    {
                    /* -- write bottom line (up) -- */
                    int y=RectBottom(rc)-GetClientTop(wnd);
                    WriteTextLine(wnd, NULL,
                        wnd->wtop+y, FALSE);
                }
            }
        }
        /* ---- reset the scroll box ---- */
        if (TestAttribute(wnd, VSCROLLBAR))    {
            int vscrollbox = ComputeVScrollBox(wnd);
            if (vscrollbox != wnd->VScrollBox)
                MoveScrollBox(wnd, vscrollbox);
        }
    }
    return TRUE;
}

/* ------------ HORIZSCROLL Message -------------- */
static BOOL HorizScrollMsg(WINDOW wnd, PARAM p1)
{
    /* --- horizontal scroll one column --- */
    if (p1)    {
        /* --- scroll left --- */
        if (wnd->wleft + ClientWidth(wnd)-1 >= wnd->textwidth)
			return FALSE;
        wnd->wleft++;
    }
    else	{
        /* --- scroll right --- */
        if (wnd->wleft == 0)
			return FALSE;
        --wnd->wleft;
	}
    SendMessage(wnd, PAINT, 0, 0);
	return TRUE;
}

/* ------------  SCROLLPAGE Message -------------- */
static void ScrollPageMsg(WINDOW wnd, PARAM p1)
{
    /* --- vertical scroll one page --- */
    if ((int) p1 == FALSE)    {
        /* ---- page up ---- */
        if (wnd->wtop)
            wnd->wtop -= ClientHeight(wnd);
    }
    else     {
        /* ---- page down ---- */
        if (wnd->wtop+ClientHeight(wnd) < wnd->wlines) {
            wnd->wtop += ClientHeight(wnd);
            if (wnd->wtop>wnd->wlines-ClientHeight(wnd))
                wnd->wtop=wnd->wlines-ClientHeight(wnd);
        }
    }
    if (wnd->wtop < 0)
        wnd->wtop = 0;
    SendMessage(wnd, PAINT, 0, 0);
}

/* ------------ HORIZSCROLLPAGE Message -------------- */
static void HorizScrollPageMsg(WINDOW wnd, PARAM p1)
{
    /* --- horizontal scroll one page --- */
    if ((int) p1 == FALSE)
        /* ---- page left ----- */
        wnd->wleft -= ClientWidth(wnd);
    else    {
        /* ---- page right ----- */
        wnd->wleft += ClientWidth(wnd);
        if (wnd->wleft > wnd->textwidth-ClientWidth(wnd))
            wnd->wleft = wnd->textwidth-ClientWidth(wnd);
    }
    if (wnd->wleft < 0)
        wnd->wleft = 0;
    SendMessage(wnd, PAINT, 0, 0);
}

/* ------------ SCROLLDOC Message -------------- */
static void ScrollDocMsg(WINDOW wnd, PARAM p1)
{
    /* --- scroll to beginning or end of document --- */
    if ((int) p1)
        wnd->wtop = wnd->wleft = 0;
    else if (wnd->wtop+ClientHeight(wnd) < wnd->wlines){
        wnd->wtop = wnd->wlines-ClientHeight(wnd);
        wnd->wleft = 0;
    }
    SendMessage(wnd, PAINT, 0, 0);
}

/* ------------ PAINT Message -------------- */
static void PaintMsg(WINDOW wnd, PARAM p1, PARAM p2)
{
    /* ------ paint the client area ----- */
    RECT rc, rcc;
    int y;
    char blankline[201];

    /* ----- build the rectangle to paint ----- */
    if ((RECT *)p1 == NULL)
        rc=RelativeWindowRect(wnd, WindowRect(wnd));
    else
        rc= *(RECT *)p1;
    if (TestAttribute(wnd, HASBORDER) &&
            RectRight(rc) >= WindowWidth(wnd)-1) {
        if (RectLeft(rc) >= WindowWidth(wnd)-1)
            return;
        RectRight(rc) = WindowWidth(wnd)-2;
    }
    rcc = AdjustRectangle(wnd, rc);

	if (!p2 && wnd != inFocus)
		ClipString++;

    /* ----- blank line for padding ----- */
    memset(blankline, ' ', SCREENWIDTH);
    blankline[RectRight(rcc)+1] = '\0';

    /* ------- each line within rectangle ------ */
    for (y = RectTop(rc); y <= RectBottom(rc); y++){
        int yy;
        /* ---- test outside of Client area ---- */
        if (TestAttribute(wnd,
                    HASBORDER | HASTITLEBAR))    {
            if (y < TopBorderAdj(wnd))
                continue;
            if (y > WindowHeight(wnd)-2)
                continue;
        }
        yy = y-TopBorderAdj(wnd);
        if (yy < wnd->wlines-wnd->wtop)
            /* ---- paint a text line ---- */
            WriteTextLine(wnd, &rc,
                        yy+wnd->wtop, FALSE);
        else    {
            /* ---- paint a blank line ---- */
            SetStandardColor(wnd);
            writeline(wnd, blankline+RectLeft(rcc),
                    RectLeft(rcc)+BorderAdj(wnd), y, FALSE);
        }
    }
    /* ------- position the scroll box ------- */
    if (TestAttribute(wnd, VSCROLLBAR|HSCROLLBAR)) {
        int hscrollbox = ComputeHScrollBox(wnd);
        int vscrollbox = ComputeVScrollBox(wnd);
        if (hscrollbox != wnd->HScrollBox ||
                vscrollbox != wnd->VScrollBox)    {
            wnd->HScrollBox = hscrollbox;
            wnd->VScrollBox = vscrollbox;
            SendMessage(wnd, BORDER, p1, 0);
        }
    }
	if (!p2 && wnd != inFocus)
		--ClipString;
}

/* ------------ CLOSE_WINDOW Message -------------- */
static void CloseWindowMsg(WINDOW wnd)
{
    SendMessage(wnd, CLEARTEXT, 0, 0);
    if (wnd->TextPointers != NULL)    {
        free(wnd->TextPointers);
        wnd->TextPointers = NULL;
    }
}

/* ----------- TEXTBOX Message-processing Module ----------- */
int TextBoxProc(WINDOW wnd, MESSAGE msg, PARAM p1, PARAM p2)
{
    switch (msg)    {
        case CREATE_WINDOW:
            wnd->HScrollBox = wnd->VScrollBox = 1;
            ClearTextPointers(wnd);