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-rw-r--r--ldmicro/undoredo.cpp252
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diff --git a/ldmicro/undoredo.cpp b/ldmicro/undoredo.cpp
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+//-----------------------------------------------------------------------------
+// Copyright 2007 Jonathan Westhues
+//
+// This file is part of LDmicro.
+//
+// LDmicro is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// LDmicro 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 General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with LDmicro. If not, see <http://www.gnu.org/licenses/>.
+//------
+//
+// Routines to maintain the stack of recent versions of the program that we
+// use for the undo/redo feature. Don't be smart at all; keep deep copies of
+// the entire program at all times.
+// Jonathan Westhues, split May 2005
+//-----------------------------------------------------------------------------
+#include "linuxUI.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <iostream>
+
+#include "ldmicro.h"
+
+using namespace std;
+
+// Store a `deep copy' of the entire program before every change, in a
+// circular buffer so that the first one scrolls out as soon as the buffer
+// is full and we try to push another one.
+#define MAX_LEVELS_UNDO 32
+typedef struct ProgramStackTag {
+ PlcProgram prog[MAX_LEVELS_UNDO];
+ struct {
+ int gx;
+ int gy;
+ } cursor[MAX_LEVELS_UNDO];
+ int write;
+ int count;
+} ProgramStack;
+
+static struct {
+ ProgramStack undo;
+ ProgramStack redo;
+} Undo;
+
+//-----------------------------------------------------------------------------
+// Make a `deep copy' of a circuit. Used for making a copy of the program
+// whenever we change it, for undo purposes. Fast enough that we shouldn't
+// need to be smart.
+//-----------------------------------------------------------------------------
+/*static void *DeepCopy(int which, void *any)
+{
+ switch(which) {
+ CASE_LEAF {
+ ElemLeaf *l = AllocLeaf();
+ memcpy(l, any, sizeof(*l));
+ l->selectedState = SELECTED_NONE;
+ return l;
+ }
+ case ELEM_SERIES_SUBCKT: {
+ int i;
+ ElemSubcktSeries *n = AllocSubcktSeries();
+ ElemSubcktSeries *s = (ElemSubcktSeries *)any;
+ n->count = s->count;
+ for(i = 0; i < s->count; i++) {
+ n->contents[i].which = s->contents[i].which;
+ n->contents[i].d.any = DeepCopy(s->contents[i].which,
+ s->contents[i].d.any);
+ }
+ return n;
+ }
+ case ELEM_PARALLEL_SUBCKT: {
+ int i;
+ ElemSubcktParallel *n = AllocSubcktParallel();
+ ElemSubcktParallel *p = (ElemSubcktParallel *)any;
+ n->count = p->count;
+ for(i = 0; i < p->count; i++) {
+ n->contents[i].which = p->contents[i].which;
+ n->contents[i].d.any = DeepCopy(p->contents[i].which,
+ p->contents[i].d.any);
+ }
+ return n;
+ }
+ default:
+ oops();
+ break;
+ }
+}
+*/
+//-----------------------------------------------------------------------------
+// Empty out a ProgramStack data structure, either .undo or .redo: set the
+// count to zero and free all the program copies in it.
+//-----------------------------------------------------------------------------
+static void EmptyProgramStack(ProgramStack *ps)
+{
+ while(ps->count > 0) {
+ int a = (ps->write - 1);
+ if(a < 0) a += MAX_LEVELS_UNDO;
+ ps->write = a;
+ (ps->count)--;
+
+ int i;
+ for(i = 0; i < ps->prog[ps->write].numRungs; i++) {
+ FreeCircuit(ELEM_SERIES_SUBCKT, ps->prog[ps->write].rungs[i]);
+ }
+ }
+}
+/*
+//-----------------------------------------------------------------------------
+// Push the current program onto a program stack. Can either make a deep or
+// a shallow copy of the linked data structures.
+//-----------------------------------------------------------------------------
+static void PushProgramStack(ProgramStack *ps, BOOL deepCopy)
+{
+ if(ps->count == MAX_LEVELS_UNDO) {
+ int i;
+ for(i = 0; i < ps->prog[ps->write].numRungs; i++) {
+ FreeCircuit(ELEM_SERIES_SUBCKT,
+ ps->prog[ps->write].rungs[i]);
+ }
+ } else {
+ (ps->count)++;
+ }
+
+ memcpy(&(ps->prog[ps->write]), &Prog, sizeof(Prog));
+ if(deepCopy) {
+ int i;
+ for(i = 0; i < Prog.numRungs; i++) {
+ ps->prog[ps->write].rungs[i] =
+ (ElemSubcktSeries *)DeepCopy(ELEM_SERIES_SUBCKT, Prog.rungs[i]);
+ }
+ }
+
+ int gx, gy;
+ if(FindSelected(&gx, &gy)) {
+ ps->cursor[ps->write].gx = gx;
+ ps->cursor[ps->write].gy = gy;
+ } else {
+ ps->cursor[ps->write].gx = -1;
+ ps->cursor[ps->write].gy = -1;
+ }
+
+ int a = (ps->write + 1);
+ if(a >= MAX_LEVELS_UNDO) a -= MAX_LEVELS_UNDO;
+ ps->write = a;
+}
+
+//-----------------------------------------------------------------------------
+// Pop a program stack onto the current program. Always does a shallow copy.
+// Internal error if the stack was empty.
+//-----------------------------------------------------------------------------
+static void PopProgramStack(ProgramStack *ps)
+{
+ int a = (ps->write - 1);
+ if(a < 0) a += MAX_LEVELS_UNDO;
+ ps->write = a;
+ (ps->count)--;
+
+ memcpy(&Prog, &ps->prog[ps->write], sizeof(Prog));
+
+ SelectedGxAfterNextPaint = ps->cursor[ps->write].gx;
+ SelectedGyAfterNextPaint = ps->cursor[ps->write].gy;
+}
+
+//-----------------------------------------------------------------------------
+// Push a copy of the PLC program onto the undo history, replacing (and
+// freeing) the oldest one if necessary.
+//-----------------------------------------------------------------------------
+void UndoRemember(void)
+{
+ // can't redo after modifying the program
+ EmptyProgramStack(&(Undo.redo));
+ PushProgramStack(&(Undo.undo), TRUE);
+
+ SetUndoEnabled(TRUE, FALSE);
+}
+
+//-----------------------------------------------------------------------------
+// Pop the undo history one level, or do nothing if we're out of levels of
+// undo. This means that we push the current program on the redo stack, and
+// pop the undo stack onto the current program.
+//-----------------------------------------------------------------------------
+void UndoUndo(void)
+{
+ if(Undo.undo.count <= 0) return;
+
+ ForgetEverything();
+
+ PushProgramStack(&(Undo.redo), FALSE);
+ PopProgramStack(&(Undo.undo));
+
+ if(Undo.undo.count > 0) {
+ SetUndoEnabled(TRUE, TRUE);
+ } else {
+ SetUndoEnabled(FALSE, TRUE);
+ }
+ RefreshControlsToSettings();
+ RefreshScrollbars();
+ InvalidateRect(MainWindow, NULL, FALSE);
+}
+
+//-----------------------------------------------------------------------------
+// Redo an undone operation. Push the current program onto the undo stack,
+// and pop the redo stack into the current program.
+//-----------------------------------------------------------------------------
+void UndoRedo(void)
+{
+ if(Undo.redo.count <= 0) return;
+
+ ForgetEverything();
+
+ PushProgramStack(&(Undo.undo), FALSE);
+ PopProgramStack(&(Undo.redo));
+
+ if(Undo.redo.count > 0) {
+ SetUndoEnabled(TRUE, TRUE);
+ } else {
+ SetUndoEnabled(TRUE, FALSE);
+ }
+ RefreshControlsToSettings();
+ RefreshScrollbars();
+ InvalidateRect(MainWindow, NULL, FALSE);
+}
+*/
+//-----------------------------------------------------------------------------
+// Empty out our undo history entirely, as when loading a new file.
+//-----------------------------------------------------------------------------
+void UndoFlush(void)
+{
+ EmptyProgramStack(&(Undo.undo));
+ EmptyProgramStack(&(Undo.redo));
+ SetUndoEnabled(FALSE, FALSE);
+}
+
+//-----------------------------------------------------------------------------
+// Is it possible to undo some operation? The display code needs to do that,
+// due to an ugly hack for handling too-long lines; the only thing that
+// notices that easily is the display code, which will respond by undoing
+// the last operation, presumably the one that added the long line.
+//-----------------------------------------------------------------------------
+/*BOOL CanUndo(void)
+{
+ return (Undo.undo.count > 0);
+}*/
+
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