delphi – 是否可以在Virtual Treeview中选择多个列？

因此经过一些测试后,我想出了以下内容,感谢DiGi的额外推动. DrawSelection不适用于此解决方案,因此需要禁用它.因为我不认为我很快就会再这样做,所以我没有写下属.

将toDisableDrawSelection,toExtendedFocus和toMultiSelect设置为True.

在适当的地方声明以下变量/属性：

StartSelectedColumn: integer;
FirstSelectedColumn: integer;
LastSelectedColumn: integer;
Selecting: boolean;

更新以下事件：

onkeydown事件

if (not Selecting) and (Key = VK_SHIFT) then
begin
  StartSelectedColumn := vtMain.FocusedColumn;
  FirstSelectedColumn := StartSelectedColumn;
  LastSelectedColumn := StartSelectedColumn;
  Selecting := true;
end;

的onkeyup

if Key = VK_SHIFT then
  Selecting := false;

OnFocusChanged

if Selecting then
begin
  if column < StartSelectedColumn then
  begin
    FirstSelectedColumn := column;
    LastSelectedColumn := StartSelectedColumn;
  end
  else if column > StartSelectedColumn then
  begin
    FirstSelectedColumn := StartSelectedColumn;
    LastSelectedColumn := column
  end
  else
  begin
    FirstSelectedColumn := column;
    LastSelectedColumn := column;
  end;
end
else
begin
  StartSelectedColumn := column;
  FirstSelectedColumn := column;
  LastSelectedColumn := column;
end;

OnBeforeCellPaint

if vtMain.Selected[node] and InRange(column,FirstSelectedColumn,LastSelectedColumn) then
begin
  if vtMain.Focused then
    TargetCanvas.Brush.Color := vtMain.Colors.FocusedSelectionColor
  else
    TargetCanvas.Brush.Color := vtMain.Colors.UnfocusedSelectionColor;
  TargetCanvas.Brush.Style := bsSolid;
  TargetCanvas.FillRect(CellRect);
end;

OnPaintText

if vtMain.Selected[node] and InRange(column,LastSelectedColumn) then
begin
  if vtMain.Focused then
    TargetCanvas.Font.Color := clHighlightText
  else
    TargetCanvas.Font.Color := vtMain.Font.Color;
end;