用于实现拖入操作的通用类
Code1 #pragma once
2 // COleDropTargetEx command target
3
4 /************************************************************************/
5 /* ClassName : COleDropTargetEx
6 /* Author : yangguichun
7 /* Date : 2009/02/01
8 /* Description : 这是对COleDropTarget的扩展，因为COleDropTarget只支持CView
9 这个类将支持所有类型的窗体类
10 /************************************************************************/
11 template<typename CTargetCtrl>
12 class COleDropTargetEx : public COleDropTarget
13 {
14 public:
15 COleDropTargetEx(){};
16 virtual ~COleDropTargetEx(){};
17
18 protected:
19 //处理OnDropEx消息是必须的，否则OnDrop函数不会被执行
20 //当然也可以在OnDropEx函数中处理数据
21 virtual DROPEFFECT OnDragEnter(CWnd* pWnd, COleDataObject* pDataObject, DWORD dwKeyState, CPoint point);
22 virtual DROPEFFECT OnDragOver(CWnd* pWnd, COleDataObject* pDataObject, DWORD dwKeyState, CPoint point);
23 virtual DROPEFFECT OnDropEx(CWnd* pWnd, COleDataObject* pDataObject, DROPEFFECT dropEffect, DROPEFFECT dropEffectList, CPoint point);
24 virtual BOOL OnDrop(CWnd* pWnd, COleDataObject* pDataObject, DROPEFFECT dropEffect, CPoint point);
25 virtual void OnDragLeave(CWnd* pWnd);
26 };
27
28 template<typename CTargetCtrl>
29 DROPEFFECT COleDropTargetEx<CTargetCtrl>::OnDragEnter(CWnd* pWnd, COleDataObject* pDataObject,DWORD dwKeyState, CPoint point)
30 {
31 ASSERT_VALID(this);
32 ASSERT(::IsWindow(pWnd->m_hWnd));
33
34 if (pWnd->IsKindOf(RUNTIME_CLASS(CView)))//if CView,Call base class
35 return COleDropTarget::OnDragEnter(pWnd,pDataObject, dwKeyState, point);
36
37
38 CTargetCtrl* pTargetCtrl = NULL;
39 if(pWnd->IsKindOf(RUNTIME_CLASS(CTargetCtrl)))
40 {
41 pTargetCtrl = (CTargetCtrl*)pWnd;
42 return pTargetCtrl->OnDragEnter(pWnd, pDataObject, dwKeyState, point);
43 }
44 else
45 {
46 return COleDropTarget::OnDragEnter(pWnd, pDataObject, dwKeyState, point);
47 }
48 }
49
50 template<typename CTargetCtrl>
51 DROPEFFECT COleDropTargetEx<CTargetCtrl>::OnDragOver(CWnd* pWnd, COleDataObject* pDataObject,
52 DWORD dwKeyState, CPoint point)
53 {
54 ASSERT_VALID(this);
55 ASSERT(::IsWindow(pWnd->m_hWnd));
56
57 if (pWnd->IsKindOf(RUNTIME_CLASS(CView)))//if CView,Call base class
58 return COleDropTarget::OnDragOver(pWnd,pDataObject, dwKeyState, point);
59
60 CTargetCtrl* pTargetCtrl = NULL;
61 if(pWnd->IsKindOf(RUNTIME_CLASS(CTargetCtrl)))
62 {
63 pTargetCtrl = (CTargetCtrl*)pWnd;
64 return pTargetCtrl->OnDragOver(pWnd, pDataObject, dwKeyState, point);
65 }
66 else
67 {
68 return COleDropTarget::OnDragOver(pWnd, pDataObject, dwKeyState, point);
69 }
70 }
71
72 template<typename CTargetCtrl>
73 BOOL COleDropTargetEx<CTargetCtrl>::OnDrop(CWnd* pWnd, COleDataObject* pDataObject, DROPEFFECT dropEffect, CPoint point)
74 {
75 ASSERT_VALID(this);
76 ASSERT(::IsWindow(pWnd->m_hWnd));
77
78 if (pWnd->IsKindOf(RUNTIME_CLASS(CView)))//if CView,Call base class
79 return COleDropTarget::OnDrop(pWnd, pDataObject,dropEffect,point);
80
81 CTargetCtrl* pTargetCtrl = NULL;
82 if(pWnd->IsKindOf(RUNTIME_CLASS(CTargetCtrl)))
83 {
84 pTargetCtrl = (CTargetCtrl*)pWnd;
85 return pTargetCtrl->OnDrop(pWnd, pDataObject, dropEffect, point);
86 }
87 else
88 {
89 return COleDropTarget::OnDrop(pWnd, pDataObject, dropEffect, point);
90 }
91 }
92
93 template<typename CTargetCtrl>
94 DROPEFFECT COleDropTargetEx<CTargetCtrl>::OnDropEx(CWnd* pWnd, COleDataObject* pDataObject, DROPEFFECT dropEffect, DROPEFFECT dropEffectList, CPoint point)
95 {
96 ASSERT_VALID(this);
97 ASSERT(::IsWindow(pWnd->m_hWnd));
98
99 if (pWnd->IsKindOf(RUNTIME_CLASS(CView)))//if CView,Call base class
100 return COleDropTarget::OnDropEx( pWnd, pDataObject, dropEffect, dropEffectList, point) ;
101
102 CTargetCtrl* pTargetCtrl = NULL;
103 if(pWnd->IsKindOf(RUNTIME_CLASS(CTargetCtrl)))
104 {
105 pTargetCtrl = (CTargetCtrl*)pWnd;
106 return pTargetCtrl->OnDropEx( pWnd, pDataObject, dropEffect, dropEffectList, point);
107 }
108 else
109 {
110 return COleDropTarget::OnDropEx( pWnd, pDataObject, dropEffect, dropEffectList, point);
111 }
112 }
113
114 template<typename CTargetCtrl>
115 void COleDropTargetEx<CTargetCtrl>::OnDragLeave(CWnd* pWnd)
116 {
117 ASSERT_VALID(this);
118 ASSERT(::IsWindow(pWnd->m_hWnd));
119
120 if (pWnd->IsKindOf(RUNTIME_CLASS(CView)))//if CView,Call base class
121 {
122 COleDropTarget::OnDragLeave( pWnd );
123 return;
124 }
125
126 CTargetCtrl* pTargetCtrl = NULL;
127 if(pWnd->IsKindOf(RUNTIME_CLASS(CTargetCtrl)))
128 {
129 pTargetCtrl = (CTargetCtrl*)pWnd;
130 return pTargetCtrl->OnDragLeave( pWnd );
131 }
132 else
133 {
134 return COleDropTarget::OnDragLeave( pWnd );
135 }
136 }
137
138
139 /************************************************************************/
140 /* ClassName : CDropPolicy
141 /* Author : yangguichun
142 /* Date : 2009/02/01
143 /* Description : 凡是需要支持拖入操作的控件，只需继承该类，并将自身作为
144 模板参数传进来即可。
145 然后，需要重载OnDrop函数，在该函数的实现中编写需要实现的拖放动作
146 /************************************************************************/
147 template<typename CTargetCtrl>
148 class CDropPolicy
149 {
150 public:
151 CDropPolicy(){};
152 virtual ~CDropPolicy(){};
153
154 public:
155 virtual BOOL Register()
156 {
157 return m_oleDropTarget.Register((CTargetCtrl*)this);
158 }
159
160 virtual DROPEFFECT OnDragEnter(CWnd* pWnd, COleDataObject* pDataObject, DWORD dwKeyState, CPoint point)
161 {
162 return (DROPEFFECT)-1;
163 }
164 virtual DROPEFFECT OnDragOver(CWnd* pWnd, COleDataObject* pDataObject, DWORD dwKeyState, CPoint point)
165 {
166 return (DROPEFFECT)-1;
167 }
168 virtual DROPEFFECT OnDropEx(CWnd* pWnd, COleDataObject* pDataObject, DROPEFFECT dropEffect, DROPEFFECT dropList, CPoint point)
169 {
170 return (DROPEFFECT)-1;
171 }
172 virtual BOOL OnDrop(CWnd* pWnd, COleDataObject* pDataObject, DROPEFFECT dropEffect, CPoint point)=0;
173 virtual void OnDragLeave(CWnd* pWnd){};
174
175 private:
176 COleDropTargetEx<CTargetCtrl> m_oleDropTarget;
177 };
