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lazcontrols: TTreeFilterEdit: restore scroll position

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This commit is contained in:
mattias 2023-08-14 15:08:53 +02:00
parent ee218d1fa0
commit 99810467be
1 changed files with 18 additions and 0 deletions
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18
components/lazcontrols/treefilteredit.pas
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@ -72,6 +72,7 @@ type
private
fFilteredTreeview: TCustomTreeview; // A control showing the (filtered) data.
fImageIndexDirectory: integer; // Needed if directory structure is shown.
FScrolledPos: TPoint;
fSelectionList: TStringList; // Store/restore the old selections here.
fShowDirHierarchy: Boolean; // Show directories / files as a tree structure.
fBranches: TBranchList; // Items under these nodes can be sorted.
@ -108,6 +109,7 @@ type
function DeleteBranch(ARootNode: TTreeNode): Boolean;
public
property ImageIndexDirectory: integer read fImageIndexDirectory write fImageIndexDirectory;
property ScrolledPos: TPoint read FScrolledPos; // only valid if positive
property SelectionList: TStringList read fSelectionList;
property ShowDirHierarchy: Boolean read fShowDirHierarchy write SetShowDirHierarchy;
published
@ -555,6 +557,15 @@ begin
fFirstPassedNode:=Nil;
ANode:=fFilteredTreeview.Selected;
if (ANode=nil) then Exit;
if (not ANode.IsVisible) and (fFilteredTreeview is TTreeView) then
begin
// selected node is not in scrolled view -> store scroll position
FScrolledPos.X:=TTreeView(fFilteredTreeview).ScrolledLeft;
FScrolledPos.Y:=TTreeView(fFilteredTreeview).ScrolledTop;
end else begin
FScrolledPos.X:=-1;
FScrolledPos.Y:=-1;
end;
if ANode=fFilteredTreeview.Items.GetFirstVisibleNode then Exit;
fSelectionList.Clear; // Clear old selection only if there is new one.
fSelectionList.Add(ANode.Text);
@ -590,6 +601,13 @@ begin
else
ANode:=fFilteredTreeview.Items.GetFirstVisibleNode; // Otherwise first node
fFilteredTreeview.Selected:=ANode;
if fFilteredTreeview is TTreeView then
begin
if FScrolledPos.Y>=0 then
TTreeView(fFilteredTreeview).ScrolledTop:=FScrolledPos.Y;
if FScrolledPos.X>=0 then
TTreeView(fFilteredTreeview).ScrolledLeft:=FScrolledPos.X;
end;
end;
function TTreeFilterEdit.GetExistingBranch(ARootNode: TTreeNode): TTreeFilterBranch;