11using namespace std;
12
// ---------------------------------------------------------------------------------------------------------------
13
14
// ---------------------------------------------------------------------------------------------------------------
15#define hy_assert_error(str) { std::cerr << str << endl; assert(false); }
16#define hy_assert_warning(str) { std::cout << str << endl; }
17
// ---------------------------------------------------------------------------------------------------------------
18
19namespace hy
20{
21 RedoUndoTool::RedoUndoTool( int depth )
22 : m_iRedoUndoDepth(depth), m_iCurrentStep(-1)
23 {
24 m_aCommandStack.clear();
25 }
26
27 void RedoUndoTool::add( RedoUndoTool::Command * command )
28 {
29 int num = m_aCommandStack.size();
30
31 if ( m_iCurrentStep == num-1 || m_iCurrentStep == -1 )
32 {
33 m_aCommandStack.push_back(command);
34 m_iCurrentStep ++;
35 }
36 else if ( m_iCurrentStep < num-1 )
37 {
38 m_aCommandStack.erase(
39 m_aCommandStack.begin()+m_iCurrentStep+1, m_aCommandStack.end()
40 );
41 m_aCommandStack.push_back(command);
42 m_iCurrentStep ++;
43 }
44 else
45 {
46 hy_assert_error( \" error : RedoUndoTool::add( const RedoUndoTool::Command & command ) :\"
47 << \" invalid m_iCurrentStep\" );
48 }
49
50 // keep the depth
51 num = m_aCommandStack.size();
52 if ( num > m_iRedoUndoDepth )
53 {
54 m_aCommandStack.erase( m_aCommandStack.begin(),
55 m_aCommandStack.begin()+num-m_iRedoUndoDepth );
56 m_iCurrentStep = m_iRedoUndoDepth-1;
57 }
58 }
59
60 bool RedoUndoTool::redo()
61 {
62 int num = m_aCommandStack.size();
63 if ( m_iCurrentStep == num-1 )
{
65 hy_assert_warning(\" warning : RedoUndoTool::redo() :\"
66 << \" out of range: default to return directively!! \" );
67 }
68 else if ( m_iCurrentStep < num-1 && m_iCurrentStep >= -1 )
69 {
70 return m_aCommandStack[++m_iCurrentStep]->redo();
71 }
72 else
73 {
74 hy_assert_error(\" error : RedoUndoTool::redo() :\"
75 << \" invalid m_iCurrentStep\" );
76 }
77 return false;
78 }
79
80 bool RedoUndoTool::undo()
81 {
82 int num = m_aCommandStack.size();
83 if ( m_iCurrentStep == -1 )
84 {
85 hy_assert_warning(\" warning : RedoUndoTool::undo() :\"
86 << \" out of range: default to return directively!! \" );
87 }
88 else if ( m_iCurrentStep <= num-1 && m_iCurrentStep > -1 )
{
90 return m_aCommandStack[m_iCurrentStep--]->undo();
91 }
92 else
93 {
94 hy_assert_error(\" error : RedoUndoTool::undo() :\"
95 << \" invalid m_iCurrentStep\" );
96 }
97 return false;
98 }
99
100}
101
这是显示模块，在这里只显示接口
1/***********************************************************************
2* \\file DrawTransaction.h
3* \\date 2008-07-07
4* \\author HYin
5**********************************************************************/
6
7#ifndef DRAWTRANSACTION_H
8#define DRAWTRANSACTION_H
9
10
// ---------------------------------------------------------------------------------------------------------------
11
// ---------------------------------------------------------------------------------------------------------------
12
13namespace hy
14{
15 class DrawTransaction
16 {
17 public :
18 DrawTransaction();
19 virtual ~DrawTransaction();
20
21 virtual void draw() =0;
22 };
23}
24
25#endif
26
