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1 | /////////////////////////////////////////////////////////////////////////////// |
2 | // Name: msw/ole/dropsrc.cpp | |
3 | // Purpose: implementation of wxIDropSource and wxDropSource | |
4 | // Author: Vadim Zeitlin | |
5 | // Modified by: | |
6 | // Created: 10.05.98 | |
7 | // RCS-ID: $Id$ | |
8 | // Copyright: (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr> | |
9 | // Licence: wxWindows license | |
10 | /////////////////////////////////////////////////////////////////////////////// | |
11 | ||
12 | // ============================================================================ | |
13 | // declarations | |
14 | // ============================================================================ | |
15 | ||
16 | // ---------------------------------------------------------------------------- | |
17 | // headers | |
18 | // ---------------------------------------------------------------------------- | |
19 | ||
20 | #ifdef __GNUG__ | |
21 | #pragma implementation "dropsrc.h" | |
22 | #endif | |
23 | ||
24 | // For compilers that support precompilation, includes "wx.h". | |
25 | #include "wx/wxprec.h" | |
26 | ||
27 | #if defined(__BORLANDC__) | |
28 | #pragma hdrstop | |
29 | #endif | |
30 | ||
31 | #include <wx/setup.h> | |
32 | ||
33 | #if USE_DRAG_AND_DROP | |
34 | ||
35 | #include <wx/log.h> | |
36 | #include <wx/msw/ole/oleutils.h> | |
37 | #include <wx/msw/ole/dataobj.h> | |
38 | #include <wx/msw/ole/dropsrc.h> | |
39 | ||
40 | #ifndef __WIN32__ | |
41 | #include <ole2.h> | |
42 | #include <olestd.h> | |
43 | #endif | |
44 | ||
45 | // ---------------------------------------------------------------------------- | |
46 | // wxIDropSource implementation of IDropSource interface | |
47 | // ---------------------------------------------------------------------------- | |
48 | ||
49 | class wxIDropSource : public IDropSource | |
50 | { | |
51 | public: | |
52 | wxIDropSource(wxDropSource *pDropSource); | |
53 | ||
54 | DECLARE_IUNKNOWN_METHODS; | |
55 | ||
56 | // IDropSource | |
57 | STDMETHODIMP QueryContinueDrag(BOOL fEscapePressed, DWORD grfKeyState); | |
58 | STDMETHODIMP GiveFeedback(DWORD dwEffect); | |
59 | ||
60 | private: | |
61 | DWORD m_grfInitKeyState; // button which started the d&d operation | |
62 | wxDropSource *m_pDropSource; // pointer to C++ class we belong to | |
63 | }; | |
64 | ||
65 | // ============================================================================ | |
66 | // Implementation | |
67 | // ============================================================================ | |
68 | ||
69 | // ---------------------------------------------------------------------------- | |
70 | // wxIDropSource implementation | |
71 | // ---------------------------------------------------------------------------- | |
72 | BEGIN_IID_TABLE(wxIDropSource) | |
73 | ADD_IID(Unknown) | |
74 | ADD_IID(DropSource) | |
75 | END_IID_TABLE; | |
76 | ||
77 | IMPLEMENT_IUNKNOWN_METHODS(wxIDropSource) | |
78 | ||
79 | wxIDropSource::wxIDropSource(wxDropSource *pDropSource) | |
80 | { | |
81 | wxASSERT( pDropSource != NULL ); | |
82 | ||
83 | m_pDropSource = pDropSource; | |
84 | m_grfInitKeyState = 0; | |
85 | m_cRef = 0; | |
86 | } | |
87 | ||
88 | // Name : wxIDropSource::QueryContinueDrag | |
89 | // Purpose : decide if drag operation must be continued or not | |
90 | // Returns : HRESULT: S_OK if we should continue | |
91 | // DRAGDROP_S_DROP to drop right now | |
92 | // DRAGDROP_S_CANCEL to cancel everything | |
93 | // Params : [in] BOOL fEscapePressed <Esc> pressed since last call? | |
94 | // [in] DWORD grfKeyState mask containing state of kbd keys | |
95 | // Notes : as there is no reasonably simple portable way to implement this | |
96 | // function, we currently don't give the possibility to override the | |
97 | // default behaviour implemented here | |
98 | STDMETHODIMP wxIDropSource::QueryContinueDrag(BOOL fEscapePressed, | |
99 | DWORD grfKeyState) | |
100 | { | |
101 | if ( fEscapePressed ) | |
102 | return DRAGDROP_S_CANCEL; | |
103 | ||
104 | // initialize ourself with the drag begin button | |
105 | if ( m_grfInitKeyState == 0 ) { | |
106 | m_grfInitKeyState = grfKeyState & (MK_LBUTTON | MK_RBUTTON | MK_MBUTTON); | |
107 | } | |
108 | ||
109 | if ( !(grfKeyState & m_grfInitKeyState) ) { | |
110 | // button which started d&d released, go! | |
111 | return DRAGDROP_S_DROP; | |
112 | } | |
113 | ||
114 | return S_OK; | |
115 | } | |
116 | ||
117 | // Name : wxIDropSource::GiveFeedback | |
118 | // Purpose : give UI feedback according to current state of operation | |
119 | // Returns : STDMETHODIMP | |
120 | // Params : [in] DWORD dwEffect - what would happen if we dropped now | |
121 | // Notes : default implementation is ok in more than 99% of cases | |
122 | STDMETHODIMP wxIDropSource::GiveFeedback(DWORD dwEffect) | |
123 | { | |
124 | wxDropSource::DragResult effect; | |
125 | if ( dwEffect & DROPEFFECT_COPY ) | |
126 | effect = wxDropSource::Copy; | |
127 | else if ( dwEffect & DROPEFFECT_MOVE ) | |
128 | effect = wxDropSource::Move; | |
129 | else | |
130 | effect = wxDropSource::None; | |
131 | ||
132 | if ( m_pDropSource->GiveFeedback(effect, | |
133 | (dwEffect & DROPEFFECT_SCROLL) != 0 ) ) | |
134 | return S_OK; | |
135 | ||
136 | return DRAGDROP_S_USEDEFAULTCURSORS; | |
137 | } | |
138 | ||
139 | // ---------------------------------------------------------------------------- | |
140 | // wxDropSource implementation | |
141 | // ---------------------------------------------------------------------------- | |
142 | ||
143 | // ctors | |
144 | ||
145 | // common part of all ctors | |
146 | void wxDropSource::Init() | |
147 | { | |
148 | m_pIDropSource = new wxIDropSource(this); | |
149 | m_pIDropSource->AddRef(); | |
150 | } | |
151 | ||
088a95f5 | 152 | wxDropSource::wxDropSource(wxWindow* WXUNUSED(win)) |
269a5a34 VZ |
153 | { |
154 | Init(); | |
155 | m_pData = NULL; | |
156 | } | |
157 | ||
088a95f5 | 158 | wxDropSource::wxDropSource(wxDataObject& data, wxWindow* WXUNUSED(win)) |
269a5a34 VZ |
159 | { |
160 | Init(); | |
161 | SetData(data); | |
162 | } | |
163 | ||
164 | void wxDropSource::SetData(wxDataObject& data) | |
165 | { | |
166 | m_pData = &data; | |
167 | } | |
168 | ||
169 | wxDropSource::~wxDropSource() | |
170 | { | |
171 | m_pIDropSource->Release(); | |
172 | } | |
173 | ||
174 | // Name : DoDragDrop | |
175 | // Purpose : start drag and drop operation | |
176 | // Returns : DragResult - the code of performed operation | |
177 | // Params : [in] bool bAllowMove: if false, only copy is allowed | |
178 | // Notes : you must call SetData() before if you had used def ctor | |
179 | wxDropSource::DragResult wxDropSource::DoDragDrop(bool bAllowMove) | |
180 | { | |
a539b39f | 181 | wxCHECK_MSG( m_pData != NULL, None, "No data in wxDropSource!" ); |
269a5a34 VZ |
182 | |
183 | DWORD dwEffect; | |
184 | HRESULT hr = ::DoDragDrop(m_pData->GetInterface(), | |
185 | m_pIDropSource, | |
186 | bAllowMove ? DROPEFFECT_COPY | DROPEFFECT_MOVE | |
187 | : DROPEFFECT_COPY, | |
188 | &dwEffect); | |
189 | ||
190 | if ( hr == DRAGDROP_S_CANCEL ) { | |
191 | return Cancel; | |
192 | } | |
193 | else if ( hr == DRAGDROP_S_DROP ) { | |
194 | if ( dwEffect & DROPEFFECT_COPY ) { | |
195 | return Copy; | |
196 | } | |
197 | else if ( dwEffect & DROPEFFECT_MOVE ) { | |
198 | // consistency check: normally, we shouldn't get "move" at all | |
199 | // here if !bAllowMove, but in practice it does happen quite often | |
200 | if ( bAllowMove ) | |
201 | return Move; | |
202 | else | |
203 | return Copy; | |
204 | } | |
205 | else { | |
206 | // not copy or move | |
207 | return None; | |
208 | } | |
209 | } | |
210 | else { | |
211 | if ( FAILED(hr) ) { | |
212 | wxLogApiError("DoDragDrop", hr); | |
213 | wxLogError("Drag & drop operation failed."); | |
214 | } | |
215 | else { | |
216 | wxLogDebug("Unexpected success return code %08lx from DoDragDrop.", hr); | |
217 | } | |
218 | ||
219 | return Error; | |
220 | } | |
221 | } | |
222 | ||
223 | // Name : wxDropSource::GiveFeedback | |
224 | // Purpose : visually inform the user about d&d operation state | |
225 | // Returns : bool: true if we do all ourselves or false for default feedback | |
226 | // Params : [in] DragResult effect - what would happen if we dropped now | |
227 | // [in] bool bScrolling - true if target is scrolling | |
228 | // Notes : here we just leave this stuff for default implementation | |
229 | bool wxDropSource::GiveFeedback(DragResult effect, bool bScrolling) | |
230 | { | |
e8435fa3 | 231 | return FALSE; |
269a5a34 VZ |
232 | } |
233 | ||
234 | #endif //USE_DRAG_AND_DROP |