private unsafe bool WmSelChanging(ref Message m)
{
if (!bEnableSelectEvents)
{
return(false);
}
Native.NMTREEVIEW *nmtv = (Native.NMTREEVIEW *)m.LParam;
TreeNode node = TreeNode.FromHandle(this, nmtv->itemNew.hItem);
OnBeforeMultiSelectStart(new CMSTreeViewMultiSelectEventArgs(SelectedNodes, TreeViewAction.Unknown));
bool bIsSelected = true;
CMSTreeViewCancelEventArgs e = new CMSTreeViewCancelEventArgs(node, false, bIsSelected, TreeViewAction.Unknown);
OnBeforeSelect(e);
if (e.Cancel)
{
// user canceled operation, cancel changing of the selection
m.Result = (IntPtr)1;
return(true);
}
return(false);
}
private unsafe bool WmNotify(ref Message m)
{
Native.NMHDR *nmhdr = (Native.NMHDR *)m.LParam;
// Custom draw code is handled separately.
//
if (nmhdr->code == (int)Native.NotifyMsg.NM_CUSTOMDRAW)
{
return(false);
}
Native.NMTREEVIEW *nmtv = (Native.NMTREEVIEW *)m.LParam;
switch (nmtv->nmhdr.code)
{
//case Native.TVN_DELETEITEMA:
//case Native.TVN_DELETEITEMW:
// return WmDeleteItem(ref m);
case Native.TVM_SETITEMA:
case Native.TVM_SETITEMW:
break;
case Native.TVN_ITEMEXPANDEDA:
case Native.TVN_ITEMEXPANDEDW:
break;
case Native.TVN_ITEMEXPANDINGA:
case Native.TVN_ITEMEXPANDINGW:
return(WmExpanding(ref m));
case Native.TVN_SELCHANGINGA:
case Native.TVN_SELCHANGINGW:
return(WmSelChanging(ref m));
case Native.TVN_SELCHANGEDA:
case Native.TVN_SELCHANGEDW:
return(WmSelChanged(ref m));
}
return(false);
}
private unsafe bool WmSelChanged(ref Message m)
{
if (!bEnableSelectEvents)
{
return(false);
}
Native.NMTREEVIEW *nmtv = (Native.NMTREEVIEW *)m.LParam;
TreeNode node = TreeNode.FromHandle(this, nmtv->itemNew.hItem);
bool bIsSelected = true;//(nmtv->itemNew.state & Native.TVIS.SELECTED) != 0;
TreeNode oldNode = TreeNode.FromHandle(this, nmtv->itemOld.hItem);
AddSelectedItem(node);
CMSTreeViewEventArgs e = new CMSTreeViewEventArgs(node, bIsSelected, TreeViewAction.Unknown);
OnAfterSelect(e);
OnAfterMultiSelectComplete(new CMSTreeViewMultiSelectEventArgs(SelectedNodes, TreeViewAction.Unknown));
return(false);
}
private unsafe bool WmExpanding(ref Message m)
{
Native.NMTREEVIEW *nmtv = (Native.NMTREEVIEW *)m.LParam;
bool bCollapse = nmtv->action == Native.TVE_COLLAPSE;
if (bCollapse)
{
TreeNode node = TreeNode.FromHandle(this, nmtv->itemNew.hItem);
if (node.GetNodeCount(false) == 0)
{
return(false);
}
TreeNode firstChild = node.FirstNode;
TreeNode nextSibling = node.NextNode;
TreeNode focusedNode = GetFocusedItem();
bool bCancel = false; // cancel event processing
// change focus if necessary
bool bChangeSelection = CompareNodes(focusedNode, firstChild) >= 0 &&
(nextSibling == null || CompareNodes(focusedNode, nextSibling) < 0);
if (bChangeSelection)
{
OnBeforeMultiSelectStart(new CMSTreeViewMultiSelectEventArgs(SelectedNodes, TreeViewAction.Collapse));
if (!SetFocusedItem(node, true, focusedNode, TreeViewAction.Collapse))
{
// user canceled operation, cancel collapsing
bCancel = true;
goto cleanup;
}
}
// get the first selected child node
int i = 0;
for (; i < this.selectedNodes.Count; i++)
{
if (CompareNodes((TreeNode)this.selectedNodes[i], firstChild) >= 0)
{
break;
}
}
if (i >= this.selectedNodes.Count)
{
goto cleanup;
}
// drop all selected nodes starting from i
for (; i < this.selectedNodes.Count && (nextSibling == null || CompareNodes((TreeNode)this.selectedNodes[i], nextSibling) < 0);)
{
if (!bChangeSelection)
{
// OnBeforeMultiSelectStart should be called only once
OnBeforeMultiSelectStart(new CMSTreeViewMultiSelectEventArgs(SelectedNodes, TreeViewAction.Collapse));
bChangeSelection = true;
}
// drop selection
int count = this.selectedNodes.Count;
SetSelectedState((TreeNode)this.selectedNodes[i], false);
int countAfter = this.selectedNodes.Count;
if (countAfter == count)
{
// user canceled operation, cancel collapsing
m.Result = (IntPtr)1;
break;
}
// SetSelectedState changes selectedNodes array, so we don't need to shift i
}
cleanup :;
if (bChangeSelection)
{
OnAfterMultiSelectComplete(new CMSTreeViewMultiSelectEventArgs(SelectedNodes, TreeViewAction.Collapse));
}
if (bCancel)
{
bCancel = true;
}
return(bCancel);
}
return(false);
}