lazarus/components/onlinepackagemanager/opkman_categoriesfrm.pas

unit opkman_categoriesfrm;

{$mode objfpc}{$H+}

interface

uses
  Classes, SysUtils, FileUtil, Forms, Controls, Graphics, Dialogs, ExtCtrls,
  StdCtrls, opkman_VirtualTrees;

type

  { TCategoriesFrm }

  TCategoriesFrm = class(TForm)
    bCancel: TButton;
    bOk: TButton;
    imTree: TImageList;
    lbMessage: TLabel;
    pnButtons: TPanel;
    pnMessage: TPanel;
    procedure bOkClick(Sender: TObject);
    procedure FormClose(Sender: TObject; var {%H-}CloseAction: TCloseAction);
    procedure FormCreate(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
    procedure FormKeyPress(Sender: TObject; var Key: char);
    procedure lbMessageResize(Sender: TObject);
  private
    FVST: TVirtualStringTree;
    FModRes: TModalResult;
    FCategoriesCSV: String;
    FLineAdded: Boolean;
    procedure VSTGetText(Sender: TBaseVirtualTree; Node: PVirtualNode;
      Column: TColumnIndex; {%H-}TextType: TVSTTextType; var CellText: String);
    procedure VSTGetImageIndex(Sender: TBaseVirtualTree; Node: PVirtualNode;
      {%H-}Kind: TVTImageKind; Column: TColumnIndex; var {%H-}Ghosted: Boolean;
      var ImageIndex: Integer);
    procedure VSTCompareNodes(Sender: TBaseVirtualTree; Node1,
      Node2: PVirtualNode; Column: TColumnIndex; var Result: Integer);
    procedure VSTFreeNode(Sender: TBaseVirtualTree; Node: PVirtualNode);
    function CheckNode(const AName: String): Boolean;
  public
    procedure SetupControls;
    procedure PopulateTree;
    property CategoriesCSV: String read FCategoriesCSV write FCategoriesCSV;
  end;

var
  CategoriesFrm: TCategoriesFrm;

implementation
uses opkman_const, opkman_common;
{$R *.lfm}

type
  PData = ^TData;
  TData = record
    FName: string[100];
    FImageIndex: Integer;
  end;

{ TCategoriesFrm }

procedure TCategoriesFrm.FormClose(Sender: TObject;
  var CloseAction: TCloseAction);
begin
  if FModRes <> mrNone then
    ModalResult := FModRes;
end;

procedure TCategoriesFrm.bOkClick(Sender: TObject);
var
  Node: PVirtualNode;
  Data: PData;
begin
  FCategoriesCSV := '';
  Node := FVST.GetFirst;
  while Assigned(Node) do
  begin
    Data := FVST.GetNodeData(Node);
    if FVST.CheckState[Node] = csCheckedNormal then
    begin
      if FCategoriesCSV = '' then
        FCategoriesCSV := Data^.FName
      else
        FCategoriesCSV := FCategoriesCSV + ', ' + Data^.FName;
    end;
    Node := FVST.GetNext(Node);
  end;
end;

procedure TCategoriesFrm.FormCreate(Sender: TObject);
begin
  FVST := TVirtualStringTree.Create(nil);
  with FVST do
  begin
    Parent := Self;
    Align := alClient;
    Anchors := [akLeft, akTop, akRight];
    Images := imTree;
    Color := clBtnFace;
    DefaultNodeHeight := 25;
    Indent := 0;
    TabOrder := 1;
    DefaultText := '';
    Header.AutoSizeIndex := 0;
    Header.Height := 25;
    Colors.BorderColor := clBlack;
    BorderSpacing.Top := 5;
    BorderSpacing.Left := 10;
    BorderSpacing.Right := 10;
    with Header.Columns.Add do begin
      Position := 0;
      Width := 250;
      Text := 'CategorieName';
    end;
    Header.Options := [hoAutoResize, hoColumnResize, hoRestrictDrag, hoShowSortGlyphs, hoAutoSpring];
    Header.SortColumn := 0;
    TabOrder := 1;
    TreeOptions.MiscOptions := [toFullRepaintOnResize, toInitOnSave, toToggleOnDblClick, toWheelPanning, toCheckSupport];
    TreeOptions.PaintOptions := [toHideFocusRect, toPopupMode, toShowButtons, toShowDropmark, toThemeAware, toUseBlendedImages];
    TreeOptions.SelectionOptions := [toFullRowSelect, toRightClickSelect];
    TreeOptions.AutoOptions := [toAutoTristateTracking];
    OnGetText := @VSTGetText;
    OnGetImageIndex := @VSTGetImageIndex;
    OnCompareNodes := @VSTCompareNodes;
    OnFreeNode := @VSTFreeNode;
  end;
  FVST.NodeDataSize := SizeOf(TData);
end;

procedure TCategoriesFrm.FormDestroy(Sender: TObject);
begin
  FVST.Clear;
  FVST.Free;
end;

procedure TCategoriesFrm.FormKeyPress(Sender: TObject; var Key: char);
begin
  if Key = #13 then
  begin
    FModRes := mrYes;
    Close;
  end
  else if Key = #27 then
  begin
    FModRes := mrNo;
    Close;
  end;
end;

procedure TCategoriesFrm.lbMessageResize(Sender: TObject);
begin
  pnMessage.Height := lbMessage.Top + lbMessage.Height + 5;
end;

procedure TCategoriesFrm.VSTGetText(Sender: TBaseVirtualTree;
  Node: PVirtualNode; Column: TColumnIndex; TextType: TVSTTextType;
  var CellText: String);
var
  Data: PData;
begin
  Data := FVST.GetNodeData(Node);
  if Column = 0 then
    CellText := Data^.FName;
end;

procedure TCategoriesFrm.VSTGetImageIndex(Sender: TBaseVirtualTree;
  Node: PVirtualNode; Kind: TVTImageKind; Column: TColumnIndex;
  var Ghosted: Boolean; var ImageIndex: Integer);
var
  Data: PData;
begin
  Data := FVST.GetNodeData(Node);
  if Column = 0 then
    ImageIndex := Data^.FImageIndex;
end;

procedure TCategoriesFrm.VSTCompareNodes(Sender: TBaseVirtualTree; Node1,
  Node2: PVirtualNode; Column: TColumnIndex; var Result: Integer);
var
  Data1: PData;
  Data2: PData;
begin
  Data1 := Sender.GetNodeData(Node1);
  Data2 := Sender.GetNodeData(Node2);
  if Column = 0 then
    Result := CompareText(Data1^.FName, Data2^.FName);
end;

procedure TCategoriesFrm.VSTFreeNode(Sender: TBaseVirtualTree;
  Node: PVirtualNode);
var
  Data: PData;
begin
  Data := FVST.GetNodeData(Node);
  Finalize(Data^);
end;

procedure TCategoriesFrm.SetupControls;
begin
  FModRes := mrNone;
  Caption := rsCategoriesFrm_Caption;
  lbMessage.Caption := rsCategoriesFrm_lbMessage_Caption;
  bOk.Caption := rsCategoriesFrm_bYes_Caption;
  bCancel.Caption := rsCategoriesFrm_bCancel_Caption;
  bOk.Top := (pnButtons.Height - bOk.Height) div 2;
  bCancel.Top := (pnButtons.Height - bCancel.Height) div 2;
  pnMessage.Height := lbMessage.Top + lbMessage.Height + 5;
end;

function TCategoriesFrm.CheckNode(const AName: String): Boolean;
var
  Node: PVirtualNode;
  Data: PData;
begin
  Result := False;
  Node := FVST.GetFirst;
  while Assigned(Node) do
  begin
    Data := FVST.GetNodeData(Node);
    if UpperCase(Data^.FName) = UpperCase(AName) then
    begin
      FVST.CheckState[Node] := csCheckedNormal;
      Result := True;
      Break;
    end;
    Node := FVST.GetNext(Node);
  end;
end;

procedure TCategoriesFrm.PopulateTree;
var
  I: Integer;
  Node: PVirtualNode;
  Data: PData;
  SL: TStringList;
begin
  FLineAdded := True;
  for I := 0 to MaxCategories - 1 do
  begin
    Node := FVST.AddChild(nil);
    Node^.CheckType := ctTriStateCheckBox;
    Data := FVST.GetNodeData(Node);
    Data^.FName := Categories[I];
    Data^.FImageIndex := -1;
  end;

  SL := TStringList.Create;
  try
    SL.Delimiter := ',';
    SL.DelimitedText := FCategoriesCSV;
    for I := 0 to SL.Count - 1 do
      CheckNode(Trim(SL.Strings[I]));
  finally
    SL.Free;
  end;
end;

end.