bug fix for vista in multi-selection tree
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@49631 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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@@ -52,6 +52,40 @@
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// get HTREEITEM from wxTreeItemId
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#define HITEM(item) ((HTREEITEM)(((item).m_pItem)))
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// older SDKs are missing these
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#ifndef TVN_ITEMCHANGINGA
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#define TVN_ITEMCHANGINGA (TVN_FIRST-16)
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#define TVN_ITEMCHANGINGW (TVN_FIRST-17)
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typedef struct tagNMTVITEMCHANGE
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{
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NMHDR hdr;
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UINT uChanged;
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HTREEITEM hItem;
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UINT uStateNew;
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UINT uStateOld;
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LPARAM lParam;
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} NMTVITEMCHANGE;
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#endif
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// this global variable is used on vista systems for preventing unwanted
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// item state changes in the vista tree control. It is only used in
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// multi-select mode on vista systems.
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static HTREEITEM gs_unlockItem = NULL;
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class TreeItemUnlocker
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{
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public:
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TreeItemUnlocker(HTREEITEM item) { gs_unlockItem = item; }
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~TreeItemUnlocker() { gs_unlockItem = NULL; }
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};
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// ----------------------------------------------------------------------------
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// private functions
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// ----------------------------------------------------------------------------
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@@ -65,6 +99,8 @@ static bool IsItemSelected(HWND hwndTV, HTREEITEM hItem)
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tvi.stateMask = TVIS_SELECTED;
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tvi.hItem = hItem;
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TreeItemUnlocker unlocker(hItem);
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if ( !TreeView_GetItem(hwndTV, &tvi) )
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{
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wxLogLastError(wxT("TreeView_GetItem"));
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@@ -81,6 +117,8 @@ static bool SelectItem(HWND hwndTV, HTREEITEM hItem, bool select = true)
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tvi.state = select ? TVIS_SELECTED : 0;
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tvi.hItem = hItem;
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TreeItemUnlocker unlocker(hItem);
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if ( TreeView_SetItem(hwndTV, &tvi) == -1 )
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{
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wxLogLastError(wxT("TreeView_SetItem"));
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@@ -804,6 +842,8 @@ bool wxTreeCtrl::DoGetItem(wxTreeViewItem *tvItem) const
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void wxTreeCtrl::DoSetItem(wxTreeViewItem *tvItem)
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{
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TreeItemUnlocker unlocker(tvItem->hItem);
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if ( TreeView_SetItem(GetHwnd(), tvItem) == -1 )
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{
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wxLogLastError(wxT("TreeView_SetItem"));
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@@ -2564,6 +2604,36 @@ bool wxTreeCtrl::MSWOnNotify(int idCtrl, WXLPARAM lParam, WXLPARAM *result)
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}
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break;
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// Vista's tree control has introduced some problems with our
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// multi-selection tree. When TreeView_SelectItem() is called,
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// the wrong items are deselected.
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// Fortunately, Vista provides a new notification, TVN_ITEMCHANGING
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// that can be used to regulate this incorrect behavior. The
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// following messages will allow only the unlocked item's selection
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// state to change
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case TVN_ITEMCHANGINGA:
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case TVN_ITEMCHANGINGW:
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{
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// we only need to handles these in multi-select trees
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if ( HasFlag(wxTR_MULTIPLE) )
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{
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// get info about the item about to be changed
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NMTVITEMCHANGE* info = (NMTVITEMCHANGE*)lParam;
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if (info->hItem != gs_unlockItem)
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{
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// item's state is locked, don't allow the change
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// returning 1 will disallow the change
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*result = 1;
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return true;
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}
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}
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// allow the state change
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}
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return false;
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// NB: MSLU is broken and sends TVN_SELCHANGEDA instead of
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// TVN_SELCHANGEDW in Unicode mode under Win98. Therefore
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// we have to handle both messages:
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