unit extra_controls;

interface

uses
  Classes, SysUtils, Forms, Windows, Messages, System.Types, StdCtrls, Clipbrd,
  SizeGrip, apphelpers, Vcl.Graphics, Vcl.Dialogs, gnugettext, Vcl.ImgList, Vcl.ComCtrls,
  ShLwApi, Vcl.ExtCtrls, VirtualTrees, SynRegExpr, Vcl.Controls;

type
  // Form with a sizegrip in the lower right corner, without the need for a statusbar
  TExtForm = class(TForm)
    private
      FSizeGrip: TSizeGripXP;
      function GetHasSizeGrip: Boolean;
      procedure SetHasSizeGrip(Value: Boolean);
    protected
      procedure DoShow; override;
      procedure DoBeforeMonitorDpiChanged(OldDPI, NewDPI: Integer); override;
      procedure DoAfterMonitorDpiChanged(OldDPI, NewDPI: Integer); override;
      procedure FilterNodesByEdit(Edit: TButtonedEdit; Tree: TVirtualStringTree);
    public
      constructor Create(AOwner: TComponent); override;
      class procedure InheritFont(AFont: TFont);
      property HasSizeGrip: Boolean read GetHasSizeGrip write SetHasSizeGrip default False;
      class procedure FixControls(ParentComp: TComponent);
      class procedure SaveListSetup(List: TVirtualStringTree);
      class procedure RestoreListSetup(List: TVirtualStringTree);
      function ScaleSize(x: Extended): Integer; overload;
      class function ScaleSize(x: Extended; Control: TControl): Integer; overload;
  end;


implementation


{ TExtForm }

constructor TExtForm.Create(AOwner: TComponent);
var
  OldImageList: TCustomImageList;
begin
  inherited;

  InheritFont(Font);
  HasSizeGrip := False;

  // Reduce flicker on Windows 10
  // See https://www.heidisql.com/forum.php?t=19141
  if CheckWin32Version(6, 2) then begin
    DoubleBuffered := True;
  end;

  // Translation and related fixes
  // Issue #557: Apply images *after* translating main menu, so top items don't get unused
  // space left besides them.
  if (Menu <> nil) and (Menu.Images <> nil) then begin
    OldImageList := Menu.Images;
    Menu.Images := nil;
    TranslateComponent(Self);
    Menu.Images := OldImageList;
  end else begin
    TranslateComponent(Self);
  end;

end;


procedure TExtForm.DoShow;
begin
  FixControls(Self);
  inherited;
end;


procedure TExtForm.DoBeforeMonitorDpiChanged(OldDPI, NewDPI: Integer);
begin
  // Reduce flicker
  inherited;
  LockWindowUpdate(Handle);
end;

procedure TExtForm.DoAfterMonitorDpiChanged(OldDPI, NewDPI: Integer);
begin
  // Release window updates
  LockWindowUpdate(0);
  inherited;
end;


class procedure TExtForm.FixControls(ParentComp: TComponent);
var
  i: Integer;

  procedure ProcessSingleComponent(Cmp: TComponent);
  begin
    if (Cmp is TButton) and (TButton(Cmp).Style = bsSplitButton) then begin
      // Work around broken dropdown (tool)button on Wine after translation:
      // https://sourceforge.net/p/dxgettext/bugs/80/
      TButton(Cmp).Style := bsPushButton;
      TButton(Cmp).Style := bsSplitButton;
    end;
    if (Cmp is TToolButton) and (TToolButton(Cmp).Style = tbsDropDown) then begin
      // similar fix as above
      TToolButton(Cmp).Style := tbsButton;
      TToolButton(Cmp).Style := tbsDropDown;
    end;
  end;
begin
  // Passed component itself may also be some control to be fixed
  // e.g. TInplaceEditorLink.MainControl
  ProcessSingleComponent(ParentComp);
  for i:=0 to ParentComp.ComponentCount-1 do begin
    ProcessSingleComponent(ParentComp.Components[i]);
  end;
end;


function TExtForm.GetHasSizeGrip: Boolean;
begin
  Result := FSizeGrip <> nil;
end;


procedure TExtForm.SetHasSizeGrip(Value: Boolean);
begin
  if Value then begin
    FSizeGrip := TSizeGripXP.Create(Self);
    FSizeGrip.Enabled := True;
  end else begin
    if FSizeGrip <> nil then
      FreeAndNil(FSizeGrip);
  end;
end;


class procedure TExtForm.InheritFont(AFont: TFont);
var
  LogFont: TLogFont;
  GUIFontName: String;
begin
  // Set custom font if set, or default system font.
  // In high-dpi mode, the font *size* is increased automatically somewhere in the VCL,
  // caused by a form's .Scaled property. So we don't increase it here again.
  // To test this, you really need to log off/on Windows!
  GUIFontName := AppSettings.ReadString(asGUIFontName);
  if not GUIFontName.IsEmpty then begin
    // Apply user specified font
    AFont.Name := GUIFontName;
    // Set size on top of automatic dpi-increased size
    AFont.Size := AppSettings.ReadInt(asGUIFontSize);
  end else begin
    // Apply system font. See issue #3204.
    // Code taken from http://www.gerixsoft.com/blog/delphi/system-font
    if SystemParametersInfo(SPI_GETICONTITLELOGFONT, SizeOf(TLogFont), @LogFont, 0) then begin
      // Leave font size at default, as the system's font size is probably scaled up
      //AFont.Height := LogFont.lfHeight;
      AFont.Orientation := LogFont.lfOrientation;
      AFont.Charset := TFontCharset(LogFont.lfCharSet);
      AFont.Name := PChar(@LogFont.lfFaceName);
      case LogFont.lfPitchAndFamily and $F of
        VARIABLE_PITCH: AFont.Pitch := fpVariable;
        FIXED_PITCH: AFont.Pitch := fpFixed;
        else AFont.Pitch := fpDefault;
      end;
    end else begin
      ErrorDialog('Could not detect system font, using SystemParametersInfo.');
    end;
  end;
end;


{**
  Save setup of a VirtualStringTree to registry
}
class procedure TExtForm.SaveListSetup( List: TVirtualStringTree );
var
  i, ColWidth: Integer;
  ColWidths, ColsVisible, ColPos, Regname: String;
  OwnerForm: TWinControl;
begin
  // Prevent sporadic crash on startup
  if List = nil then
    Exit;
  OwnerForm := GetParentFormOrFrame(List);
  // On a windows shutdown, GetParentForm() seems sporadically unable to find the owner form
  // In that case we would cause an exception when accessing it. Emergency break in that case.
  // See issue #1462
  // TODO: Test this, probably fixed by implementing GetParentFormOrFrame, and then again, probably not.
  if not Assigned(OwnerForm) then
    Exit;

  ColWidths := '';
  ColsVisible := '';
  ColPos := '';

  for i := 0 to List.Header.Columns.Count - 1 do
  begin
    // Column widths
    if ColWidths <> '' then
      ColWidths := ColWidths + ',';
    ColWidth := Round(List.Header.Columns[i].Width / OwnerForm.ScaleFactor);
    ColWidths := ColWidths + IntToStr(ColWidth);

    // Column visibility
    if coVisible in List.Header.Columns[i].Options then
    begin
      if ColsVisible <> '' then
        ColsVisible := ColsVisible + ',';
      ColsVisible := ColsVisible + IntToStr(i);
    end;

    // Column position
    if ColPos <> '' then
      ColPos := ColPos + ',';
    ColPos := ColPos + IntToStr(List.Header.Columns[i].Position);

  end;

  // Lists can have the same name over different forms or frames. Find parent form or frame,
  // so we can prepend its name into the registry value name.
  Regname := OwnerForm.Name + '.' + List.Name;
  AppSettings.ResetPath;
  AppSettings.WriteString(asListColWidths, ColWidths, Regname);
  AppSettings.WriteString(asListColsVisible, ColsVisible, Regname);
  AppSettings.WriteString(asListColPositions, ColPos, Regname);
  AppSettings.WriteString(asListColSort, IntToStr(List.Header.SortColumn) + ',' + IntToStr(Integer(List.Header.SortDirection)), RegName);
end;


{**
  Restore setup of VirtualStringTree from registry
}
class procedure TExtForm.RestoreListSetup( List: TVirtualStringTree );
var
  i : Byte;
  ColWidth, colpos : Integer;
  Value : String;
  ValueList : TStringList;
  Regname: String;
  OwnerForm: TWinControl;
begin
  ValueList := TStringList.Create;

  // Column widths
  OwnerForm := GetParentFormOrFrame(List);
  Regname := OwnerForm.Name + '.' + List.Name;
  Value := AppSettings.ReadString(asListColWidths, Regname);
  if Value <> '' then begin
    ValueList := Explode( ',', Value );
    for i := 0 to ValueList.Count - 1 do
    begin
      ColWidth := MakeInt(ValueList[i]);
      ColWidth := Round(ColWidth * OwnerForm.ScaleFactor);
      // Check if column number exists and width is at least 1 pixel
      if (List.Header.Columns.Count > i) and (ColWidth > 0) and (ColWidth < 1000) then
        List.Header.Columns[i].Width := ColWidth;
    end;
  end;

  // Column visibility
  Value := AppSettings.ReadString(asListColsVisible, Regname);
  if Value <> '' then begin
    ValueList := Explode( ',', Value );
    for i:=0 to List.Header.Columns.Count-1 do begin
      if ValueList.IndexOf( IntToStr(i) ) > -1 then
        List.Header.Columns[i].Options := List.Header.Columns[i].Options + [coVisible]
      else
        List.Header.Columns[i].Options := List.Header.Columns[i].Options - [coVisible];
    end;
  end;

  // Column position
  Value := AppSettings.ReadString(asListColPositions, Regname);
  if Value <> '' then begin
    ValueList := Explode( ',', Value );
    for i := 0 to ValueList.Count - 1 do
    begin
      colpos := MakeInt(ValueList[i]);
      // Check if column number exists
      if List.Header.Columns.Count > i then
        List.Header.Columns[i].Position := colpos;
    end;
  end;

  // Sort column and direction
  Value := AppSettings.ReadString(asListColSort, Regname);
  if Value <> '' then begin
    ValueList := Explode(',', Value);
    if ValueList.Count = 2 then begin
      List.Header.SortColumn := MakeInt(ValueList[0]);
      if MakeInt(ValueList[1]) = 0 then
        List.Header.SortDirection := sdAscending
      else
        List.Header.SortDirection := sdDescending;
    end;
  end;

  ValueList.Free;
end;


procedure TExtForm.FilterNodesByEdit(Edit: TButtonedEdit; Tree: TVirtualStringTree);
var
  rx: TRegExpr;
  Node: PVirtualNode;
  i: Integer;
  match: Boolean;
  CellText: String;
begin
  // Loop through all tree nodes and hide non matching
  Node := Tree.GetFirst;
  rx := TRegExpr.Create;
  rx.ModifierI := True;
  rx.Expression := Edit.Text;
  try
    rx.Exec('abc');
  except
    on E:ERegExpr do begin
      if rx.Expression <> '' then begin
        //LogSQL('Filter text is not a valid regular expression: "'+rx.Expression+'"', lcError);
        rx.Expression := '';
      end;
    end;
  end;

  Tree.BeginUpdate;
  while Assigned(Node) do begin
    if not Tree.HasChildren[Node] then begin
      // Don't filter anything if the filter text is empty
      match := rx.Expression = '';
      // Search for given text in node's captions
      if not match then for i := 0 to Tree.Header.Columns.Count - 1 do begin
        CellText := Tree.Text[Node, i];
        match := rx.Exec(CellText);
        if match then
          break;
      end;
      Tree.IsVisible[Node] := match;
      if match and IsNotEmpty(Edit.Text) then
        Tree.VisiblePath[Node] := True;
    end;
    Node := Tree.GetNext(Node);
  end;
  Tree.EndUpdate;
  Tree.Invalidate;
  rx.Free;

  Edit.RightButton.Visible := IsNotEmpty(Edit.Text);
end;


function TExtForm.ScaleSize(x: Extended): Integer;
begin
  // Shorthand for dpi scaling hardcoded width/height values of controls
  Result := ScaleSize(x, Self);
end;

class function TExtForm.ScaleSize(x: Extended; Control: TControl): Integer;
begin
  // Same as above for callers without a form
  Result := Round(x * Control.ScaleFactor);
end;

end.