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windows-nt/Source/XPSP1/NT/sdktools/gutils/tscroll.c

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2020-09-26 03:20:57 -05:00
/*
* tscroll.c
*
* standard table class.
*
* scrolling and selection routines
*
* see table.h for interface description
*
* This implementation currently only supports TM_SINGLE, not TM_MANY
* modes of selection.
*/
#include "windows.h"
#include "commdlg.h"
#include "gutils.h"
#include "table.h"
#include "tpriv.h"
VOID
gtab_extendsel(
HWND hwnd,
lpTable ptab,
long startrow,
long startcell,
BOOL bNotify
);
/* handle a vscroll message */
void
gtab_msg_vscroll(HWND hwnd, lpTable ptab, int opcode, int pos)
{
long change;
switch(opcode) {
case SB_THUMBPOSITION:
case SB_THUMBTRACK:
change = (pos * ptab->scrollscale) - ptab->toprow;
break;
case SB_LINEUP:
change = -1;
break;
case SB_LINEDOWN:
change = 1;
break;
case SB_PAGEUP:
change = - (ptab->nlines - 3);
if (change>=0)
change = -1; // consider nlines <=3!
break;
case SB_PAGEDOWN:
change = (ptab->nlines - 3);
if (change<=0)
change = 1; // consider nlines <=3!
break;
default:
return;
}
gtab_dovscroll(hwnd, ptab, change);
}
/* handle a hscroll message */
void
gtab_msg_hscroll(HWND hwnd, lpTable ptab, int opcode, int pos)
{
int change;
switch(opcode) {
case SB_THUMBPOSITION:
case SB_THUMBTRACK:
change = pos - ptab->scroll_dx;
break;
case SB_LINEUP:
change = -(ptab->avewidth);
break;
case SB_LINEDOWN:
change = ptab->avewidth;
break;
case SB_PAGEUP:
change = - (ptab->winwidth * 2 / 3);
break;
case SB_PAGEDOWN:
change = (ptab->winwidth * 2 / 3);
break;
default:
return;
}
gtab_dohscroll(hwnd, ptab, change);
}
/*
* set new vertical scroll pos,
* adjust linedata array
* set line win-relative start posns & clip top/bottom posns
* revise display.
*/
void
gtab_dovscroll(HWND hwnd, lpTable ptab, long change)
{
int cury, i;
long ncopy;
lpCellPos cp;
LineData ldtemp;
RECT rc, rcpaint;
long range;
long newtop;
int newpos;
BOOL fWasVisible = FALSE;
if (ptab->selvisible)
{
fWasVisible = TRUE;
ptab->selvisible = FALSE;
gtab_invertsel(hwnd, ptab, NULL);
}
range = ptab->hdr.nrows - (ptab->nlines - 1);
newtop = ptab->toprow + change;
if (range < 0) {
range = 0;
}
if (newtop > range) {
change = range - ptab->toprow;
} else if (newtop < 0) {
change = -(ptab->toprow);
}
ptab->toprow += change;
newpos = (int) (newtop / ptab->scrollscale);
SetScrollPos(hwnd, SB_VERT, newpos, TRUE);
if (ptab->hdr.sendscroll) {
gtab_sendtq(hwnd, TQ_SCROLL, ptab->toprow);
}
/* adjust data ptrs rather than invalidate, to retain the
* data we know is still valid
*/
if (abs(change) >= ptab->nlines) {
gtab_invallines(hwnd, ptab, ptab->hdr.fixedrows,
ptab->nlines - ptab->hdr.fixedrows);
InvalidateRect(hwnd, NULL, FALSE);
change = 0;
} else if (change < 0) {
/* copy data down */
ncopy = (ptab->nlines - ptab->hdr.fixedrows) - abs(change);
for (i = ptab->nlines - 1;
i >= (ptab->hdr.fixedrows + abs(change)); i--) {
ldtemp = ptab->pdata[i - abs(change)];
ptab->pdata[i - abs(change)] = ptab->pdata[i];
ptab->pdata[i] = ldtemp;
}
gtab_invallines(hwnd, ptab,
ptab->hdr.fixedrows, (int) abs(change));
} else if (change > 0) {
ncopy = (ptab->nlines - ptab->hdr.fixedrows) - change;
for (i = ptab->hdr.fixedrows;
i < (ncopy + ptab->hdr.fixedrows); i++) {
ldtemp = ptab->pdata[i + change];
ptab->pdata[i + change] = ptab->pdata[i];
ptab->pdata[i] = ldtemp;
}
gtab_invallines(hwnd, ptab,
(int) ncopy + ptab->hdr.fixedrows, (int) change);
}
/* scroll window */
GetClientRect(hwnd, &rc);
rcpaint = rc;
if (change > 0) {
rc.top += (int) (change + ptab->hdr.fixedrows) * ptab->rowheight;
rcpaint.top = (ptab->hdr.fixedrows * ptab->rowheight);
rcpaint.top += rc.bottom - rc.top;
} else if (change < 0) {
rc.top += (ptab->hdr.fixedrows * ptab->rowheight);
rc.bottom += (int) (change * ptab->rowheight);
rcpaint.bottom -= rc.bottom - rc.top;
}
/* loop through each line setting relative posn and clipping */
/* set up all rows - the fixed/moveable difference for
* rows is made at fetch-time during painting, when we remember
* which absolute row nr to ask for, for a given screen line
*/
cury = 0;
for (i = 0; i < ptab->nlines; i++) {
cp = &ptab->pdata[i].linepos;
cp->start = cury;
cp->clipstart = cury;
cp->clipend = cury + cp->size;
cury += cp->size;
}
/* now move and repaint the window */
if (change != 0) {
if (rc.top < rc.bottom) {
ScrollWindow(hwnd, 0, (int) -(change * ptab->rowheight),
&rc, NULL);
}
// don't repaint the fixed rows
rc.top = 0;
rc.bottom = ptab->hdr.fixedrows * ptab->rowheight;
ValidateRect(hwnd, &rc);
/* force repaint now, not just post message for later,
* since we want to repaint that line before the next
* scroll down occurs
*/
ValidateRect(hwnd, &rcpaint);
RedrawWindow(hwnd, &rcpaint, NULL,
RDW_NOERASE | RDW_INVALIDATE | RDW_INTERNALPAINT);
}
if (fWasVisible)
{
gtab_invertsel(hwnd, ptab, NULL);
ptab->selvisible = TRUE;
}
}
/*
* set new horizontal scroll pos,
* set col win-relative start posns & clip left/right posns
* revise display.
*/
void
gtab_dohscroll(HWND hwnd, lpTable ptab, long change)
{
int curx, i;
int moveable;
lpCellPos cp;
int newdx, range;
/* check that the new scroll pos is still within the valid range */
range = ptab->rowwidth - ptab->winwidth;
newdx = ptab->scroll_dx + (int) change;
if (range < 0) {
range = 0;
}
if (newdx > range) {
change = range - ptab->scroll_dx;
} else if (newdx < 0) {
change = -(ptab->scroll_dx);
}
ptab->scroll_dx += (int) change;
SetScrollPos(hwnd, SB_HORZ, ptab->scroll_dx, TRUE);
if (ptab->hdr.fixedcols > 0) {
RECT rc;
GetClientRect(hwnd, &rc);
rc.left = ptab->pcellpos[ptab->hdr.fixedcols - 1].clipend;
InvalidateRect(hwnd, &rc, FALSE);
} else {
InvalidateRect(hwnd, NULL, FALSE);
}
/* loop through each col setting relative posn and clipping */
/* clip off 1 pixel left and right (we added 2 on to size for this) */
/* first set up fixed columns */
curx = 0;
for (i = 0; i < ptab->hdr.fixedcols; i++) {
cp = &ptab->pcellpos[i];
cp->start = curx + 1;
cp->clipstart = cp->start;
cp->clipend = cp->start + cp->size - 2;
curx += cp->size;
}
/* now moveable columns. remember start of moveable cols */
moveable = curx;
curx = - ptab->scroll_dx; /* rel. pos of col */
for (i = ptab->hdr.fixedcols; i < ptab->hdr.ncols; i++) {
cp = &ptab->pcellpos[i];
cp->start = curx + moveable + 1;
cp->clipstart = max(moveable+1, cp->start);
cp->clipend = cp->start + cp->size - 2;
curx += cp->size;
}
}
/*
* convert screen line nr to table row nr
*/
long
gtab_linetorow(HWND hwnd, lpTable ptab, int line)
{
if (line < ptab->hdr.fixedrows) {
return(line);
}
return (line + ptab->toprow);
}
/*
* convert table row nr to screen line nr or -1 if not on screen
*/
int
gtab_rowtoline(HWND hwnd, lpTable ptab, long row)
{
if (row < ptab->hdr.fixedrows) {
return( (int) row);
}
row -= ptab->toprow;
if ((row >= ptab->hdr.fixedrows) && (row < ptab->nlines)) {
return ( (int) row);
}
return(-1);
}
/*
* check if a given location is within the current selection.
* Returns true if it is inside the current selection, or false if
* either there is no selection, or the row, cell passed is outside it.
*/
BOOL
gtab_insideselection(
lpTable ptab,
long row,
long cell)
{
long startrow, endrow;
long startcell, endcell;
if (0 == ptab->select.nrows) {
// no selection
return FALSE;
}
// selection maintains anchor point as startrow,
// so the selection can extend forwards or backwards from there.
// need to convert to forward only for comparison
startrow = ptab->select.startrow;
if (ptab->select.nrows < 0) {
endrow = startrow;
startrow += ptab->select.nrows + 1;
} else {
endrow = startrow + ptab->select.nrows - 1;
}
if ((row < startrow) || (row > endrow)) {
return FALSE;
}
// if we are in row-select mode, then that's it - its inside
if (ptab->hdr.selectmode & TM_ROW) {
return TRUE;
}
// same calculation for cells
startcell = ptab->select.startcell;
if (ptab->select.ncells < 0) {
endcell = startcell;
startcell += ptab->select.ncells + 1;
} else {
endcell = startcell + ptab->select.ncells - 1;
}
if ((cell < startcell) || (cell > endcell)) {
return FALSE;
}
return TRUE;
}
/*
* replace old selection with new. Notify owner if bNotify. Change
* display to reflect new display.
*/
void
gtab_select(
HWND hwnd,
lpTable ptab,
long row,
long col,
long nrows,
long ncells,
BOOL bNotify)
{
/* if in ROW mode, force col and ncells to reflect the entire row. */
if (ptab->hdr.selectmode & TM_ROW) {
col = 0;
ncells = ptab->hdr.ncols;
}
/* clear existing sel if valid and visible */
if ((ptab->select.nrows != 0) && (ptab->selvisible == TRUE)) {
/* only clear sel if it is different from the new one */
if ((ptab->select.startrow != row) ||
(ptab->select.startcell != col) ||
(ptab->select.nrows != nrows) ||
(ptab->select.ncells != ncells)) {
gtab_invertsel(hwnd, ptab, NULL);
ptab->selvisible = FALSE;
}
}
/* set select fields and send TQ_SELECT */
if (row < ptab->hdr.nrows) {
ptab->select.startrow = row;
ptab->select.startcell = col;
ptab->select.nrows = nrows;
ptab->select.ncells = ncells;
} else {
ptab->select.nrows = 0;
ptab->select.startrow = 0;
ptab->select.startcell = 0;
ptab->select.ncells = 0;
}
if (bNotify) {
gtab_sendtq(hwnd, TQ_SELECT, (LPARAM) &ptab->select);
}
/* paint in selection */
if (nrows != 0) {
if (!ptab->selvisible) {
gtab_invertsel(hwnd, ptab, NULL);
ptab->selvisible = TRUE;
}
} else {
if (ptab->selvisible) {
gtab_invertsel(hwnd, ptab, NULL);
ptab->selvisible = FALSE;
}
ptab->selvisible = FALSE;
}
}
/*
* convert window y co-ord to a line nr
*/
int
gtab_ytoline(HWND hwnd, lpTable ptab, int y)
{
return(y / ptab->rowheight);
}
/*
* convert window x co-ord to a cell nr
*/
int
gtab_xtocol(HWND hwnd, lpTable ptab, int x)
{
int i;
lpCellPos ppos;
for (i = 0; i < ptab->hdr.ncols; i++) {
ppos = &ptab->pcellpos[i];
if (ppos->clipstart < ppos->clipend) {
if ( (x >= ppos->clipstart) && (x < ppos->clipend)) {
return(i);
}
}
}
return(-1);
}
/*
* check if x co-ord is 'near' (+- 2 pixels) the right border of given cell
*/
BOOL
gtab_isborder(HWND hwnd, lpTable ptab, long x, long col)
{
if (abs(ptab->pcellpos[col].clipend - x) < 2) {
return(TRUE);
} else {
return(FALSE);
}
}
/*
* set selection and send 'TQ_ENTER' event to owner
*/
void
gtab_enter(HWND hwnd, lpTable ptab, long row, long col, long nrows,
long ncells)
{
/* clear existing sel if valid and visible */
if ((ptab->select.nrows != 0) && (ptab->selvisible == TRUE)) {
/* only clear sel if it is different from the new one */
if ((ptab->select.startrow != row) ||
(ptab->select.startcell != col) ||
(ptab->select.nrows != nrows) ||
(ptab->select.ncells != ncells)) {
gtab_invertsel(hwnd, ptab, NULL);
ptab->selvisible = FALSE;
}
}
/* set select fields and send TQ_ENTER */
if (row < ptab->hdr.nrows) {
ptab->select.startrow = row;
ptab->select.startcell = col;
ptab->select.nrows = nrows;
ptab->select.ncells = ncells;
} else {
ptab->select.nrows = 0;
ptab->select.startrow = 0;
ptab->select.startcell = 0;
ptab->select.ncells = 0;
}
/* paint in selection */
if (nrows != 0) {
if (!ptab->selvisible) {
gtab_invertsel(hwnd, ptab, NULL);
ptab->selvisible = TRUE;
}
/* do this at end because it could cause a layout-change */
gtab_sendtq(hwnd, TQ_ENTER, (LPARAM) &ptab->select);
} else {
if (ptab->selvisible) {
gtab_invertsel(hwnd, ptab, NULL);
}
ptab->selvisible = FALSE;
}
}
/*
* start re-sizing a column
*/
void
gtab_trackcol(HWND hwnd, lpTable ptab, long col, long x)
{
/* ensure we see the mouse-up */
SetCapture(hwnd);
ptab->trackmode = TRACK_COLUMN;
#ifdef WIN32
ptab->tracknr = col;
ptab->trackline1 = x;
#else
// maximum 32767 columns is a reasonable limit!
ptab->tracknr = (int) (col & 0x7fff);
ptab->trackline1 = (int) (x & 0x7fff);
#endif
/* if line at other side of cell is visible, draw that too */
if (ptab->pcellpos[col].start >= ptab->pcellpos[col].clipstart) {
ptab->trackline2 = ptab->pcellpos[col].start;
} else {
ptab->trackline2 = -1;
}
gtab_drawvertline(hwnd, ptab);
}
/*
* called on right-click events. Select the cell clicked on, and if
* valid, send on to owner for any context-menu type operation
*/
void
gtab_rightclick(HWND hwnd, lpTable ptab, int x, int y)
{
long cell, ncells;
long row;
HWND hOwner;
/* find which col, row he selected */
cell = gtab_xtocol(hwnd, ptab, x);
if (cell == -1) {
return;
}
row = gtab_linetorow(hwnd, ptab, gtab_ytoline(hwnd, ptab, y));
/* is he selecting a disabled fixed area ? */
if ( (row < ptab->hdr.fixedrows) || (cell < ptab->hdr.fixedcols)) {
if (ptab->hdr.fixedselectable == FALSE) {
return;
}
}
// ignore if beyond data
if ((row >= ptab->hdr.nrows) ||
(cell >= ptab->hdr.ncols)) {
return;
}
/* is this within the already-selected area? */
if (!gtab_insideselection(ptab, row, cell)) {
// no selection, or clicked outside the selection - make new selection
// before sending the right-click
// if shift is down, extend selection
if (GetKeyState(VK_SHIFT) & 0x8000) {
gtab_extendsel(hwnd, ptab, row, cell, TRUE);
} else {
/* record and paint new selection */
if (ptab->hdr.selectmode & TM_ROW) {
cell = 0;
ncells = ptab->hdr.ncols;
} else {
ncells = 1;
}
gtab_select(hwnd, ptab, row, cell, 1, ncells, TRUE);
}
}
// now we have sent the selection, pass the message onto him
hOwner = (HANDLE) GetWindowLongPtr(hwnd, WW_OWNER);
SendMessage(hOwner, WM_RBUTTONDOWN, 0, MAKELONG( (short)x, (short)y));
}
/*
* called on mouse-down events. decide what to start tracking.
*/
void
gtab_press(HWND hwnd, lpTable ptab, int x, int y)
{
long cell, ncells;
long row;
if (ptab->trackmode != TRACK_NONE) {
return;
}
/* has he grabbed a cell-edge to resize ? */
cell = gtab_xtocol(hwnd, ptab, x);
if (cell == -1) {
return;
}
if (gtab_isborder(hwnd, ptab, x, cell)) {
gtab_trackcol(hwnd, ptab, cell, x);
return;
}
if ( (cell > 0) && gtab_isborder(hwnd, ptab, x, cell-1)) {
gtab_trackcol(hwnd, ptab, cell, x);
return;
}
/* find which line he selected */
row = gtab_linetorow(hwnd, ptab, gtab_ytoline(hwnd, ptab, y));
/* is he selecting a disabled fixed area ? */
if ( (row < ptab->hdr.fixedrows) || (cell < ptab->hdr.fixedcols)) {
if (ptab->hdr.fixedselectable == FALSE) {
return;
}
}
// ignore if beyond data
if ((row >= ptab->hdr.nrows) ||
(cell >= ptab->hdr.ncols)) {
return;
}
/* ok, start cell selection */
ptab->trackmode = TRACK_CELL;
SetCapture(hwnd);
/* record and paint new selection */
if (ptab->hdr.selectmode & TM_ROW) {
cell = 0;
ncells = ptab->hdr.ncols;
} else {
ncells = 1;
}
/*
* if the shift key is down, then extend the selection to this
* new anchor point, rather than create a new selection
*/
if (GetKeyState(VK_SHIFT) & 0x8000) {
gtab_extendsel(hwnd, ptab, row, cell, FALSE);
} else {
gtab_select(hwnd, ptab, row, cell, 1, ncells, FALSE);
}
return;
}
/*
* called on mouse-up. complete any tracking that was happening
*/
void
gtab_release(HWND hwnd, lpTable ptab, int x, int y)
{
lpCellPos ppos;
lpProps pprop;
long row, cell;
int cx;
switch(ptab->trackmode) {
case TRACK_NONE:
return;
case TRACK_COLUMN:
/* erase marker lines */
gtab_drawvertline(hwnd, ptab);
ReleaseCapture();
ptab->trackmode = TRACK_NONE;
/* adjust cell width */
ppos = &ptab->pcellpos[ptab->tracknr];
cx = ptab->trackline1 - ppos->start;
pprop = &ptab->pcolhdr[ptab->tracknr].props;
pprop->valid |= P_WIDTH;
pprop->width = cx;
gtab_calcwidths(hwnd, ptab);
gtab_setsize(hwnd, ptab);
InvalidateRect(hwnd, NULL, FALSE);
return;
case TRACK_CELL:
row = gtab_linetorow(hwnd, ptab, gtab_ytoline(hwnd, ptab, y));
cell = gtab_xtocol(hwnd, ptab, x);
ReleaseCapture();
ptab->trackmode = TRACK_NONE;
// ignore if before or beyond data
if ( (row < ptab->hdr.fixedrows) ||
(cell < ptab->hdr.fixedcols)) {
if (ptab->hdr.fixedselectable == FALSE) {
gtab_select(
hwnd,
ptab,
ptab->select.startrow,
ptab->select.startcell,
ptab->select.nrows,
ptab->select.ncells,
TRUE);
return;
}
}
if ((row >= ptab->hdr.nrows) ||
(cell >= ptab->hdr.ncols)) {
gtab_select(
hwnd,
ptab,
ptab->select.startrow,
ptab->select.startcell,
ptab->select.nrows,
ptab->select.ncells,
TRUE);
return;
}
/*
* Extend to this new selection end point
* we used to only do this if shift key pressed, but that
* is not a good UI.
*/
gtab_extendsel(hwnd, ptab, row, cell, TRUE);
return;
}
}
/* called on mouse-move. if tracking - adjust position, if not,
* set correct cursor
*/
void
gtab_move(HWND hwnd, lpTable ptab, int x, int y)
{
BOOL fOK;
int line;
long row;
int col;
lpCellPos ppos;
switch(ptab->trackmode) {
case TRACK_NONE:
col = gtab_xtocol(hwnd, ptab, x);
if (col == -1) {
SetCursor(hNormCurs);
return;
}
if (gtab_isborder(hwnd, ptab, x, col)) {
SetCursor(hVertCurs);
return;
}
if ( (col > 0) && gtab_isborder(hwnd, ptab, x, col-1)) {
SetCursor(hVertCurs);
return;
}
SetCursor(hNormCurs);
return;
case TRACK_CELL:
line = gtab_ytoline(hwnd, ptab, y);
// we used to only allow drag to extend
// the selection if the shift key was down.
// this doesn't seem to work as a UI - you expect
// to drag and extend.
/* if extending selection then
* allow scrolling by dragging off window
*/
if (line < 0) {
gtab_dovscroll(hwnd, ptab, -1);
line = gtab_ytoline(hwnd, ptab, y);
} else if (line >= ptab->nlines) {
gtab_dovscroll(hwnd, ptab, 1);
line = gtab_ytoline(hwnd, ptab, y);
}
row = gtab_linetorow(hwnd, ptab, line);
col = gtab_xtocol(hwnd, ptab, x);
// ignore if before or beyond data
if ( (row < ptab->hdr.fixedrows) || (col < ptab->hdr.fixedcols)) {
if (ptab->hdr.fixedselectable == FALSE) {
return;
}
}
if ((row >= ptab->hdr.nrows) ||
(col >= ptab->hdr.ncols)) {
return;
}
/*
* extend to this new selection end point
*/
gtab_extendsel(hwnd, ptab, row, col, FALSE);
return;
case TRACK_COLUMN:
/* check that new x is still visible/valid */
ppos = &ptab->pcellpos[ptab->tracknr];
fOK = FALSE;
if (ptab->tracknr < ptab->hdr.fixedcols) {
if ((x > ppos->start) && (x < ptab->winwidth)) {
fOK = TRUE;
}
} else {
if ((x > ppos->clipstart) && (x < ptab->winwidth)) {
fOK = TRUE;
}
}
if (fOK == TRUE) {
gtab_drawvertline(hwnd, ptab);
ptab->trackline1 = x;
gtab_drawvertline(hwnd, ptab);
}
return;
}
}
/* dbl-click - send an TQ_ENTER event to the owner (if valid) */
void
gtab_dblclick(HWND hwnd, lpTable ptab, int x, int y)
{
int cell, line;
long row;
line = gtab_ytoline(hwnd, ptab, y);
cell = gtab_xtocol(hwnd, ptab, x);
if ( (line < ptab->hdr.fixedrows) || (cell < ptab->hdr.fixedcols) ) {
if (!ptab->hdr.fixedselectable) {
return;
}
}
row = gtab_linetorow(hwnd, ptab, line);
if (ptab->hdr.selectmode & TM_ROW) {
gtab_enter(hwnd, ptab, row, 0, 1, ptab->hdr.ncols);
} else {
gtab_enter(hwnd, ptab, row, cell, 1, 1);
}
}
/*
* move selection area to visible part of window. argument bToBottom
* indicates whether to move the line onto the bottom or the top of the
* window if not visible - this affects the smoothness of scrolling
* line-by-line.
*/
void
gtab_showsel(HWND hwnd, lpTable ptab, BOOL bToBottom)
{
int line;
long change;
line = gtab_rowtoline(hwnd, ptab, ptab->select.startrow);
/* move up if last line or not at all visible */
if ( (line < 0) || line == (ptab->nlines - 1)) {
change = ptab->select.startrow - ptab->toprow;
if (bToBottom) {
/* change to bottom of window. subtract 2 not 1
* since nlines includes one line that is only
* partly visible
*/
change -= (ptab->nlines - 2);
}
change -= ptab->hdr.fixedrows;
gtab_dovscroll(hwnd, ptab, change);
}
/* add support for TM_CELL here! */
}
/*
* scroll the window so that if possible, the selected row is in the
* middle 60% of the screen so that context around it is visible.
*/
void
gtab_showsel_middle(HWND hwnd, lpTable ptab, long dyRowsFromTop)
{
int line = ptab->select.startrow;
long change = 0;
int mid_top, mid_end;
BOOL fScroll = FALSE;
if (dyRowsFromTop >= 0)
{
fScroll = TRUE;
change = (ptab->select.startrow - dyRowsFromTop) - ptab->toprow;
change -= ptab->hdr.fixedrows;
}
/* is this within the middle 60 % ? */
mid_top = ptab->toprow + (ptab->nlines * 20 / 100);
mid_end = ptab->toprow + (ptab->nlines * 80 / 100);
if ((line < mid_top + change) || (line > mid_end + change))
{
/* no - scroll so that selected line is at
* the 20% mark
*/
fScroll = TRUE;
change = (ptab->select.startrow - mid_top);
change -= ptab->hdr.fixedrows;
}
if (fScroll)
{
gtab_dovscroll(hwnd, ptab, change);
}
/* again - need code here for TM_CELL mode to ensure that
* active cell is horizontally scrolled correctly
*/
}
/*
* extend the selection to set the new anchor point as startrow, startcell.
*
* nrows and ncells will then be set to include the end row of the previous
* selection. nrows, ncells < 0 indicate left and up. -1 and +1 both indicate
* just one cell or row selected.
*/
VOID
gtab_extendsel(
HWND hwnd,
lpTable ptab,
long startrow,
long startcell,
BOOL bNotify
)
{
long endrow, endcell, nrows, ncells;
/*
* if no current selection, then just select the new anchor point
*/
if (ptab->select.nrows == 0) {
gtab_select(hwnd, ptab, startrow, startcell, 1,
(ptab->hdr.selectmode & TM_ROW) ? ptab->hdr.ncols:1,
bNotify);
return;
}
if (startrow >= ptab->hdr.nrows) {
startrow = ptab->hdr.nrows -1;
} else if (startrow < 0) {
startrow = 0;
}
if (startcell >= ptab->hdr.ncols) {
startcell = ptab->hdr.ncols-1;
} else if (startcell < 0) {
startcell = 0;
}
/* calculate the row just beyond the selection
* this is one above for upwards sels, and one below for
* downard-extending sels. Then adjust down or up one
* to be the actual (inclusive) last row.
*/
endrow = ptab->select.startrow + ptab->select.nrows;
if (ptab->select.nrows < 0) {
endrow++;
} else {
endrow--;
}
if (endrow >= ptab->hdr.nrows) {
endrow = ptab->hdr.nrows-1;
}
nrows = endrow - startrow;
if (nrows >= 0) {
// convert from exclusive to inclusive
nrows++;
} else {
// convert from exclusive to inclusive
nrows--;
}
/* same calculation for cells */
endcell = ptab->select.startcell + ptab->select.ncells;
if (ptab->select.ncells < 0) {
endcell++;
} else {
endcell--;
}
ncells = endcell - startcell;
if (ncells >= 0) {
ncells++;
} else {
ncells--;
}
gtab_select(hwnd, ptab, startrow, startcell, nrows, ncells, bNotify);
}
/* move the selection a specified nr of rows or cells
* if no selection, select first visible unit
*
* if bExtend is true and there is a current selection, then extend it rather than
* replace it. Note that (startrow, startcell) will always be set to the newly
* selected position - this is the anchor point. nrows or ncells may be negative
* if the selection extends upwards above the anchor. nrows == -1 is the same
* as nrows == 1, meaning only the current row is visible. Similarly
* (in TM_CELL mode), ncells may be negative.
*
* Move the selection (ie anchor point) to make it visible. bToBottom
* indicates whether it should be moved to the bottom or the top
* of the window.
*/
VOID
gtab_changesel(
HWND hwnd,
lpTable ptab,
long rowincr,
int cellincr,
BOOL bToBottom,
BOOL bExtend
)
{
long row, col, ncols;
/* is there a selection ? */
if (ptab->select.nrows == 0) {
/* no selection - force a selection
* at the first visible unit
*/
if (ptab->hdr.fixedselectable) {
row = 0;
col = 0;
} else {
row = gtab_linetorow(hwnd, ptab, ptab->hdr.fixedrows);
/* should really check for first visible cell */
col = ptab->hdr.fixedcols;
}
ncols = 1;
if (ptab->hdr.selectmode & TM_ROW) {
col = 0;
ncols = ptab->hdr.ncols;
}
gtab_select(hwnd, ptab, row, col, 1, ncols, TRUE);
} else {
/* move the anchor point by rowincr, cellincr */
row = ptab->select.startrow + rowincr;
col = ptab->select.startcell + cellincr;
/*
* ensure that new anchor point is in a valid position
*/
while (col >= ptab->hdr.ncols) {
col -= ptab->hdr.ncols;
row++;
}
while (col < 0) {
col += ptab->hdr.ncols;
row--;
}
if (row < 0) {
row = 0;
}
if (row >= ptab->hdr.nrows) {
row = ptab->hdr.nrows-1;
}
/* check we haven't moved into non-selectable region */
if ((row < ptab->hdr.fixedrows) &&
(!ptab->hdr.fixedselectable)) {
row = ptab->hdr.fixedrows;
}
if (bExtend) {
gtab_extendsel(hwnd, ptab, row, col, TRUE);
} else {
gtab_select(
hwnd,
ptab,
row,
col,
1,
(ptab->hdr.selectmode & TM_ROW) ? ptab->hdr.ncols : 1,
TRUE);
}
}
/* ensure selection visible */
gtab_showsel(hwnd, ptab, bToBottom);
}
/*
* set the topmost selectable unit in window as the selection
*
* if bExtend is TRUE, then extend the selection to include this, rather
* than replacing the existing selection. Note that (startrow, startcell)
* is always the anchor point - ie most recently selected end, and the
* (nrows, ncells) can be + or - to extend the selection downwards or upwards.
*/
void
gtab_selhome(HWND hwnd, lpTable ptab, BOOL bExtend)
{
long startrow, startcell, ncells;
if (ptab->hdr.selectmode & TM_ROW) {
ncells = ptab->hdr.ncols;
} else {
ncells = 1;
}
startcell = 0;
if (ptab->hdr.fixedselectable) {
startrow = gtab_linetorow(hwnd, ptab, 0);
} else {
startrow = gtab_linetorow(hwnd, ptab, ptab->hdr.fixedrows);
if (!(ptab->hdr.selectmode & TM_ROW)) {
startcell = ptab->hdr.fixedcols;
}
}
if (bExtend) {
gtab_extendsel(hwnd, ptab, startrow, startcell, TRUE);
} else {
gtab_select(hwnd, ptab, startrow, startcell, 1, ncells, TRUE);
}
}
/* handle key-down events - scroll windows and/or move selection */
int
gtab_key(HWND hwnd, lpTable ptab, int vkey)
{
long startrow, ncells, startcell;
BOOL bControl = FALSE;
BOOL bShift = FALSE;
if (GetKeyState(VK_CONTROL) & 0x8000) {
bControl = TRUE;
}
if (GetKeyState(VK_SHIFT) & 0x8000) {
/* ignore shift key here if TM_MANY -multiple selection flag- is
* not selected
*/
if (ptab->hdr.selectmode & TM_MANY) {
bShift = TRUE;
}
}
switch(vkey) {
case VK_UP:
if (bControl) {
/* control-uparrow scrolls window without selection.
* the selection is de-selected (to avoid surprises
* moving back to it).
*/
gtab_select(hwnd, ptab, 0, 0, 0, 0, TRUE);
gtab_dovscroll(hwnd, ptab, -1);
} else {
/* uparrow moves selection up one line */
gtab_changesel(hwnd, ptab, -1, 0, FALSE, bShift);
}
return(0);
case VK_DOWN:
if (bControl) {
/* control downarrow scrolls window without
* a selection.
*/
gtab_select(hwnd, ptab, 0, 0, 0, 0, TRUE);
gtab_dovscroll(hwnd, ptab, 1);
} else {
/* the normal gtab_changesel behaviour is
* that if the selected line is not visible now,
* we scroll it to the top of the window. This is fine
* in most cases but causes unacceptable jumps when
* repeatedly scrolling down with the down key.
*
* Thus we now have an argument to changesel to say
* that in this case, if you need to move the line onto
* the window, move it to the bottom and not the top
*/
gtab_changesel(hwnd, ptab, 1, 0, TRUE, bShift);
}
return(0);
case VK_LEFT:
/* if cell-selection mode, move left one cell.
* otherwise the whole row is selected - scroll
* the line left a little
*/
if (ptab->hdr.selectmode & TM_ROW) {
if (bControl) {
/* ctrl-left moves to start of line */
gtab_dohscroll(hwnd, ptab, -(ptab->scroll_dx));
} else {
gtab_dohscroll(hwnd, ptab, -(ptab->avewidth));
}
} else {
gtab_changesel(hwnd, ptab, 0, -1, FALSE, bShift);
}
return(0);
case VK_RIGHT:
/* if cell-selection mode, move right one cell.
* otherwise the whole row is selected - scroll
* the line right a little
*/
if (ptab->hdr.selectmode & TM_ROW) {
if (bControl) {
/* control-right moves to right end of line */
gtab_dohscroll(hwnd, ptab, ptab->rowwidth -
ptab->winwidth);
} else {
gtab_dohscroll(hwnd, ptab, ptab->avewidth);
}
} else {
gtab_changesel(hwnd, ptab, 0, 1, TRUE, bShift);
}
return(0);
case VK_HOME:
if (bControl) {
/* control-home == top of file */
gtab_dovscroll(hwnd, ptab, -(ptab->toprow));
}
/* top of window */
gtab_selhome(hwnd, ptab, bShift);
gtab_showsel(hwnd, ptab, FALSE);
return(0);
case VK_END:
if (bControl) {
/* control-end -> end of file */
startrow = ptab->hdr.nrows-1;
} else {
startrow = gtab_linetorow(hwnd, ptab, ptab->nlines - 1);
if (startrow >= ptab->hdr.nrows) {
startrow = ptab->hdr.nrows-1;
}
}
startcell = 0;
ncells = ptab->hdr.ncols;
if (!(ptab->hdr.selectmode & TM_ROW)) {
startcell = ptab->hdr.ncols-1;
ncells = 1;
}
if (bShift) {
gtab_extendsel(hwnd, ptab, startrow, startcell, TRUE);
} else {
gtab_select(hwnd, ptab, startrow, startcell, 1, ncells, TRUE);
}
/* we have selected the bottom line. We don't want to
* move it up into the window, since the intended
* effect is to select the lowest line. This doesn't
* apply to the ctrl-end behaviour (move to bottom of
* buffer.
*/
if (bControl) {
/* move the selection to make it visible - but move it
* to the bottom and not to the top of the window
*/
gtab_showsel(hwnd, ptab, TRUE);
}
return(0);
case VK_RETURN:
if (ptab->select.nrows != 0) {
gtab_showsel(hwnd, ptab, FALSE);
gtab_enter(hwnd, ptab, ptab->select.startrow,
ptab->select.startcell,
ptab->select.nrows, ptab->select.ncells);
}
return(0);
case VK_SPACE:
/* toggle the selection */
if (ptab->select.nrows == 0) {
/* no selection - make one */
gtab_changesel(hwnd, ptab, 0, 0, TRUE, FALSE);
} else {
/* there is a selection - deselect it */
gtab_select(hwnd, ptab, 0, 0, 0, 0, TRUE);
}
return(0);
case VK_PRIOR: /* page up */
if (ptab->nlines > 3) {
gtab_dovscroll(hwnd, ptab, -(ptab->nlines - 3));
}
gtab_selhome(hwnd, ptab, bShift);
return(0);
case VK_NEXT: /* page down */
/* scroll down one page */
if (ptab->nlines > 3) {
gtab_dovscroll(hwnd, ptab, (ptab->nlines - 3));
}
/* select new bottom line */
startrow = gtab_linetorow(hwnd, ptab, ptab->nlines - 1);
if (startrow >= ptab->hdr.nrows) {
startrow = ptab->hdr.nrows-1;
}
startcell = 0;
ncells = ptab->hdr.ncols;
if (!(ptab->hdr.selectmode & TM_ROW)) {
startcell = ptab->hdr.ncols-1;
ncells = 1;
}
/* select bottom line, but don't call showsel
* since we don't want to adjust it's position - we
* want it to remain at the bottom of the window
*/
if (bShift) {
gtab_extendsel(hwnd, ptab, startrow, startcell, TRUE);
} else {
gtab_select(hwnd, ptab, startrow, startcell, 1, ncells, TRUE);
}
return(0);
default:
return(1);
}
}
int gtab_mousewheel(HWND hwnd, lpTable ptab, DWORD fwKeys, int zDelta)
{
static ULONG uScrollLines = 0;
if (fwKeys & MK_MBUTTON) {
return 1;
}
if (uScrollLines == 0) {
SystemParametersInfo(SPI_GETWHEELSCROLLLINES, 0, &uScrollLines, FALSE);
if (uScrollLines == 0) {
uScrollLines = 3;
}
}
zDelta /= -WHEEL_DELTA;
if (fwKeys & MK_CONTROL) {
//
// Left-Right scroll
//
if (ptab->hdr.selectmode & TM_ROW) {
if (fwKeys & MK_SHIFT) {
zDelta = (zDelta > 0) ? ptab->rowwidth : -ptab->rowwidth;
}
gtab_dohscroll(hwnd, ptab, ptab->avewidth * zDelta);
return 0;
}
return 1;
}
if (fwKeys & MK_SHIFT) {
//
// Page scroll
//
if (ptab->nlines > 3) {
zDelta *= ptab->nlines - 3;
}
}
else {
if (uScrollLines) {
zDelta *= uScrollLines;
zDelta = min(zDelta, ptab->nlines - 3);
}
}
gtab_dovscroll(hwnd, ptab, zDelta);
return 0;
}
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