Serge_G

Hi,

I found a way to sort my lists using Sort an OnCompare event but I don't figure out a functional way to use Sort(Compare) method (Rio 10.3.3)

Any clues ?

Thanks

On 4/8/2020 at 8:34 PM, bazzer747 said:

So a 'close' on the query does what exactly (in terms of any SQL code in the query)?

A close no, but an unprepare should be to check. If your first SQL works, other request just changing parameter works. i.e dm.fdq.Open('',[ 2 ] );

It's when you change the SQL and parameters the problem.

19 hours ago, Tntman said:

 Short answer is that I am afraid to code that by myself because I am scared of making it crappy and inefficient but I guess it is the learning curve ... 

Well don't be so afraid. I think you can use a TFrame (somewhere TFrame is like a style) for all that filling stuff. I think it was the Paul Toth approach. 

Hi,

I never thought about including animation in a ListView but, why not 😉

However my guess is TListView is not a good candidate for this sort of usage. Instead think about the ancestor, a TScrollBox.

In my mind, this Jaques Nascimento video or videos from CodeRage2019 (Paul Thoth and Adriano Santos interventions)  

Hello,

This was a question I had in mind for a long time. I used to use, like ergeka

and, even, closing the query before (old BDE comportment)
 

dm.fdc.Close;

dm.fdc.parambyname('Pc').asString:='Woolworths';

dm.fdc.Open;

So, today, I make a little test and Firedac is really an amazing thing

dm.fdc.Open,('',[ 'Woolworths' ]);

works. One only line versus 2 (three in my case) and shorter than this ParambyName stuff. 

I certainly use this for now 😉 

By the way I test also this query

Select * from tTable  where Company = ? order by oOrderName 

a no named parameter. It works too 👍

An argument : Firedac is BDE like (this mean all the old "BDE code" could be used as is) but is much more 😉

Hi,

You are not alone 😉 even if BDE is largely obsolete I still have some fights with it.

My suggestions to use it in a MS UAC environment (from Vista and more) :

Don't use "program files" folders, install it in a root base directory (i.e. c:\borland\BDE)

After install change some options  :

    NET DIR directory  (configuration/native/Paradox

    SHAREMEMxx values (configuration/system/init)  (check this document for values)

Last, don't forget to put Object/Options/ save for use  with windows 3.1 and windows 95/NT << yes this can be a bit strange and prove obsolescence, as far as I understand this indicates BDE to find IDAPI32.cfg file and not in registry ,

as you certainly knows registry, UAC and users are not very friendly

Installing BDE ? I use a setup I found  with one of my older Delphi version (D2010 I think), but some installers (don't know if it's legal) can be found on the web i.e  here or there

be aware that BDE installer from Code Central need IDE  to be installed on the PC

I use version 5.0.1, note : last version was 5.2 I think

15 hours ago, Antony Danby said:

Oh, I think you are right about FireDAC, but the customer is a bit adverse to it at the moment and wants to spread the "risk" out a bit and I can't blame them to be honest.

I can't understand this, Firedac is much more than BDE ! Ok, if they still use paradox, db tables but wow ...

You can simplify all this, at design time the link is well known and named (LinkGridtodatasourcexxxxxx).

Just rename your link in the BindingsList to grZasobaLink

20 hours ago, Vandrovnik said:

Thank you for helping me to get the right way!

A pleasure 😉 .

But this still does not satisfy me fully, so I persist.

My goal was to have the members linked even if no columns were defined, I found a way applying the principle : "if no columns are defined then all fields of the datasource are displayed".

Having the linked datasource is easy TLinkGridToDatasource(B).DataSource, having the member list not so but I found that TBaseObjectBindSource have an interface IScopeMemberNames

private

  ColumnList : TStringList;


procedure TForm1.Button1Click(Sender: TObject);
var B : TContainedBindComponent;
    SL : TStringList;
    S : String;
    IMembers : IScopeMemberNames;
    ib : integer;
begin
  for ib:=0 to BindingsList1.BindCompCount-1 do
  begin
   B:=BindingsList1.BindComps[ib];
   if (B.ControlComponent is TCustomGrid) then
   begin
      if TBaseObjectBindSource(TLinkGridToDatasource(B).DataSource).GetInterface(IScopeMemberNames,IMembers)
      then begin
      IMembers.GetMemberNames(ColumnList);
      for S in ColumnList do
       Memo1.Lines.Add(S);
      end;
   end;

  end;
end;

Now it's just a question of using a StringList to store the fieldnames and to arrange it  function of the grid (defined columns, and move), more "classic code" I think even if, at this time, I have no idea (Sunday not propitious to )  

P.S.

Quote

But does not keep column width, when user changes the width in runtime

The only way I think about is to have a sort of SaveGridSettings / LoadGridSettings procedure

something using ObjectBinaryToText  and reverse

function SaveGridSettings(Component: TComponent): string;
var
  BinStream:TMemoryStream;
  StrStream: TStringStream;
  s: string;
begin
  BinStream := TMemoryStream.Create;
  try
    StrStream := TStringStream.Create(s);
    try
      BinStream.WriteComponent(Component);
      BinStream.Seek(0, soFromBeginning);
      ObjectBinaryToText(BinStream, StrStream);
      StrStream.Seek(0, soFromBeginning);
      Result:= StrStream.DataString;
    finally
      StrStream.Free;
    end;
  finally
    BinStream.Free
  end;
end;

Agree with NIRAV KAKU in the principle but anyway if you want to access LiveBinded fieldname of a column, fieldname is the wrong name you have to search a membername.

My test in ideal conditions (only one StringGrid, only Stringgrid is Binded)  

Consider this code, list of all columns linked

procedure TForm1.Button1Click(Sender: TObject);
var B : TContainedBindComponent;
    C : TLinkGridToDataSourceColumns;
    ib,ic : integer;
begin
  // have to search in the whole bindingslist
  for ib:=0 to BindingsList1.BindCompCount-1 do
  begin
   B:=BindingsList1.BindComps[ib];
   // check if the component is the stringgrid  
   if (B.ControlComponent=StringGrid1) then     
   begin
     // look for all linked columns
     for ic := 0 to TLinkGridToDatasource(B).Columns.Count-1 do
      begin
       C :=TLinkGridToDataSourceColumns(TLinkGridToDatasource(B).Columns);
       Memo1.lines.add(c[ic].MemberName);
      end;
   end;
  end;
end;

From this  you can write a function, something like function FieldNameOfGrid(const Grid : TCustomGrid; col : integer) : String

function TForm100.FieldNameOfGridCol(const Grid: TcustomGrid;
  const col: Integer): String;
var B : TContainedBindComponent;
    ib : integer;
begin
  for ib:=0 to BindingsList1.BindCompCount-1 do
  begin
   B:=BindingsList1.BindComps[ib];
   if (B.ControlComponent=Grid) then
     try
       result:=TLinkGridToDataSourceColumns(TLinkGridToDatasource(B).Columns)[col].MemberName;
       break; 
     except
       result:='';
     end;
  end;
end;

Perfectible I think but working, even with unlinked columns, but only if columns are defined 

Hi,

Quote

It works for Windows, iOS and Android but not for macOS-64

sounds strange, but I am not an apple owner

1 hour ago, sjordi said:

CustomFormat to DisplayFormat

Hum, you want to say DisplayText ?

1 hour ago, sjordi said:

But the CustomFormat should be set to Format('%%.2f', %s) 

I report, I think about two times https://quality.embarcadero.com/browse/RSP-22962 , this bug. If you want to use the format of livebindings  try to use

Format('%%.2f', 1*value)

Hum !

I was convinced my picture explain the whole thing  

In my sample (pro app i'm writing) it's work, and description you gave seem to be the same goal. 

I resume : a TListview (live)binded to a BindSourceDB, linked to a Dataset (whatever could it be Firedac, ClientDataset even TProtypeBindSource) fields of this one declared and some, here your currency field, with their DisplayFormat set.

Take care one thing, you have to change those 'displaytext' in the FillExpressions collection  

one or more picture to see where you encounter difficulties (even a dfm part of the form) should be a good thing 

ie.

  object bndngslst1: TBindingsList
    Methods = <>
    OutputConverters = <>
    Left = 20
    Top = 5
    object LinkListControlToField1: TLinkListControlToField
      Category = 'Liaisons rapides'
      DataSource = bndQFacture
      Control = lvFactures
      FillExpressions = <
        item
          SourceMemberName = 'ANNEE'
          ControlMemberName = 'NumeroFacture'
          CustomFormat = '%s+'#39'-'#39'+DataSet.NUMERO.Text+'#39' ('#39'+DataSet.PART.Text+'#39')'#39
        end
        item
          SourceMemberName = 'NOM'
          ControlMemberName = 'Client'
        end
        item
          SourceMemberName = 'ECHEANCE'
          ControlMemberName = 'Echeance'
          CustomFormat = 'DisplayText+'#39' '#39'+Dataset.MODE_PAIEMENT.Text'
        end
        item
          SourceMemberName = 'MONTANT'
          ControlMemberName = 'Montant'
        end>
      FillHeaderExpressions = <>
      FillBreakGroups = <>
    end
  end

Hi,

in Binding expressions Customformat use DisplayText, see image attached. (Still filling DisplayFormat of the fields 😉)  

That's the easiest way, you can also use Format bindingList method but be careful syntax is slightly different the one we use in programs 

On 1/9/2020 at 6:02 PM, Yaron said:

I have "ListView.ItemAppearanceObject.ItemObjects.Detail.Visible = False" and "ListView.ItemAppearanceObject.ItemEditObjects.Detail.Visible = False".

And "ListView.ItemAppearance" set to "ListItem" (which adds a ">" at the end of the line for some reason).

 

Hi, you forgot to set image and accessory not visible.

Well, sorry if it's too late, i saw this post today.

"Yes you can" , playing with the ItemHeight, alas this height is an integer and can't be lesser than 1 (0 => default size) so you will obtain a gray gap more or less high depending on items count in the group  

I explain how in this blogpost (sorry french only)

You have one linked to my blog post. To see the behavior that I denounce, you only have to use livebindings editor and synchronize,accepting link change, and renaming this new link  (not fair hu ?) 

On the other hand, i am working on another sample (using the well-known biolife.cds) but it is not ready yet, mainly because i have some other functionalities (i.e. custom search)

Here some screenshots (capture and capture_1 without synchronization, last one with synchronization) , same code 

procedure TMainForm.rdbListBoxChange(Sender: TObject);
var AFillBreakGroup : TFillBreakGroupItem;
begin
LinkListBoxGroup.Active:=False;
if TRadioButton(Sender).IsChecked then
 begin
   case TRadioButton(Sender).tag of
     0 : begin
          LinkListBoxGroup.FillBreakGroups.Clear;
          LinkListBoxGroup.FillBreakFieldName:='';
          LinkListBoxGroup.FillHeaderFieldName:='';
          ClientDataSet1.IndexFieldNames:='';
         end;
     1 : begin
          LinkListBoxGroup.FillBreakGroups.Clear;
          LinkListBoxGroup.FillBreakFieldName:='Category';
          LinkListBoxGroup.FillHeaderFieldName:='Category';
          ClientDataSet1.IndexFieldNames:='Category';
         end;
     2 : begin
          ClientDataSet1.IndexFieldNames:='Length (cm)';
          LinkListBoxGroup.FillBreakFieldName:='Length (cm)';
          LinkListBoxGroup.FillHeaderFieldName:='';
          // créer les groupes
          aFillBreakGroup:=LinkListBoxGroup.FillBreakGroups.AddItem;
          AFillBreakGroup.MinValue:='0';
          AFillBreakGroup.MaxValue:=30.ToString;
          AFillBreakGroup.DisplayText:='Petits';

          aFillBreakGroup:=LinkListBoxGroup.FillBreakGroups.AddItem;
          AFillBreakGroup.MinValue:=30.ToString;
          AFillBreakGroup.MaxValue:=60.toString;
          AFillBreakGroup.DisplayText:='Moyens';

          aFillBreakGroup:=LinkListBoxGroup.FillBreakGroups.AddItem;
          AFillBreakGroup.MinValue:=60.ToString;
          AFillBreakGroup.MaxValue:=90.ToString;
          AFillBreakGroup.DisplayText:='Gros';

          aFillBreakGroup:=LinkListBoxGroup.FillBreakGroups.AddItem;
          AFillBreakGroup.MinValue:=90.ToString;
          AFillBreakGroup.DisplayText:='Enormes';
         end;
   end;
 end;
LinkListBoxGroup.Active:=True;
end;

Hi,

Pushing limits of TListBox and TListView I am testing FillBreakGroups collection (you can see my firsts steps here).

Ok, that works fine was my first thoughts.

Writing a new tutorial about list and livebindings, I create a new project and saw that using synchronize link and FillBreakGroups does not work is this not supposed to or is this a bug ?

note : my tests are only on 10.3.2 version

14 hours ago, limelect said:

@Alexander Sviridenkov  Then is this guy wrong ?

https://serge-girard.developpez.com/tutoriels/Delphi/Livebindings/Grilles/#LVII-C-1

Yes, I only check for windows  not for other platforms. I think Interface IFMXTextService and DrawSingleLine is a track to follow, but I am blocked with this Font argument (needed to be retrieve in style ?) 

 

If you only check for those 2 alternatives and only windows target my heart say Firebird as Dany Marmur I had no problem with since first version.

if you want some encrypted column the choice is Interbase (native column encryption).

Now if your targets are multi os, till now i don't access directly to Firebird database (client/server) on Android with Firedac but it works with IBDac. I don't test an embedded version of the database though.

So for multi-os I certainly will choose IB keeping in mind Firebird .

But if your project is not a multi-user one i vote for SQLite avoiding all database server deployment   

What about using TTextService ?

I just had a (deep) look into Delphi source and found TTextServiceAndroid.DrawSingleLine

      {$IFDEF ANDROID}
      if SupportsPlatformService(IFMXTextService,aService) then
        begin
          alignement:=CheckRtl(Value.ToString,'');
          if alignement=TTextAlign.Trailing
             then flag := [TFillTextFlag.RightToLeft]
             else flag:=[];
// had to get font
          aService.DrawSingleLine(Canvas,Value.ToString,Bounds,Afont,
                                  1,flag, alignement);
        end;
      {$ENDIF}

My only problem is to get the right font though (the one in the style i presume).

I don't go further with this for now.. 

Oh, it seem that was the TTextLayout.RighttoLeft who do the trick but did not work for Android 😣  and I do not know if it works for those Apple things

My friend Nabil just send me an intyeresting link
 

Hi,

I don't write nor read RTL languages, I wrote a function to detect if the text starts with a RTL char

function checkRtl (S : string; Exceptions : String = '' ) : TTextAlign;
var carray : array of WideChar;
    i : int64;
    ws : String;
begin
   for I := 0 to 9 do
      S:=StringReplace(S,i.ToString,'',[rfReplaceAll]);
  // supprime autres caractères spéciaux
    S:=StringReplace(S,'(','',[rfReplaceAll]);
    S:=StringReplace(S,')','',[rfReplaceAll]);
    S:=StringReplace(S,'"','',[rfReplaceAll]);
    S:=StringReplace(S,'''','',[rfReplaceAll]);
    S:=StringReplace(S,'-','',[rfReplaceAll]);
   if not E.IsEmpty then
     begin
        for I := 1 to Length(Exceptions) do
                S:=StringReplace(S,Exceptions[i],'',[rfReplaceAll]);
     end;

   S:=Trim(S);
   // arabic + hebrew
   SetLength(carray,$6ff-$590);
   for I := $590 to $6ff do carray[i-$590]:=Char(I);
   // there are some farsi char to be added 
   
   result:=TTextAlign.Trailing;
   if S.IsEmpty then exit;
   if inOpArray(S[1],carray) then result:=TTextAlign.Leading;
end;

And, with Nabil's Help I test my ideas in a grid.

You can find (french) discussion here and my tutorial  https://serge-girard.developpez.com/tutoriels/Delphi/Livebindings/Grilles/#LVII-C-1 

I did not test for TEdit and TLabel though but my guess it is possible

Fool I am with this unnecessary interface ! In fact, it does exists yet.

So here is my steps with a TListView / DynamicAppearance without passing it in Edit mode

There for write  the OnItemClickEvent (here my DynamicAppearance contains an TlistItemImage named 'Image'

here is dfm part

    object YourListView: TListView
      ItemAppearanceClassName = 'TDynamicAppearance'
      ItemEditAppearanceClassName = 'TDynamicAppearance'
      HeaderAppearanceClassName = 'TListHeaderObjects'
      FooterAppearanceClassName = 'TListHeaderObjects'
      Position.X = 32.000000000000000000
      Position.Y = 360.000000000000000000
      Size.Width = 225.000000000000000000
      Size.Height = 265.000000000000000000
      Size.PlatformDefault = False
      TabOrder = 5
      ItemAppearanceObjects.ItemObjects.ObjectsCollection = <
        item
          AppearanceObjectName = 'Image'
          AppearanceClassName = 'TImageObjectAppearance'
          Appearance.ScalingMode = Stretch
        end
        item
          AppearanceObjectName = 'Text1'
          AppearanceClassName = 'TTextObjectAppearance'
        end>
      ItemAppearanceObjects.ItemEditObjects.ObjectsCollection = <
        item
          AppearanceObjectName = 'Text1'
          AppearanceClassName = 'TTextObjectAppearance'
        end>
      OnItemClick = YourListViewItemClick
    end

and code part

var AListItemBitmap : TListItemImage;
    AListItemText : TListItemText;
    AColor : TAlphaColor;
begin
YourListView.Items.SetChecked(AItem.Index,not Aitem.Checked);
AListItemBitmap:=AItem.Objects.FindObjectT<TListItemImage>('Image');
if Assigned(AListItemBitmap) then
 begin
     AListItemBitmap.OwnsBitmap:=True; 
     AListItemBitmap.Bitmap:=TBitmap.Create(40,40);
     if AItem.Checked then AColor:=TAlphaColorRec.AliceBlue
                      else AColor:=TAlphaColorRec.Null;
     AListItemBitmap.Bitmap.Clear(Acolor);
 end; 

but you can change text font (afraid AListItemText.TextColor don't work)

AListItemText:=AItem.Objects.FindObjectT<TListItemText>('Text1');
if Assigned(AListItemText) then
     if AItem.Checked then AListItemText.Font.Style:=[TFontStyle.fsBold]
                      else AListItemText.Font.Style:=[];

Quote

My problem is I want to skip the checkboxes.

Well you can skip or hide , putting the listview in edit mode and hiding the checkbox works "as expected". I put commas in reference to my previous post.

Using a Dynamic appearance this is the best way because checkbox doesn't react (point 2, bug ?)

Quote

2- I try to do the same thing but with appearance I prefer, the TDynamicAppearance one. In this case the checkbox don't react

But color change  the only thing is to find how the color is changing and set-it

Quote

My guess is I actually have to hook the click to the underlying database... Tag to set it on/off, but obviously it's not enough.

Well, if you have a Boolean field to bind, yes (I am writing another tutorial about Listview and ListImage but in review/correction till now).

I checked for event like "OnChecked"  or similar but for now I don't found one reachable, I searched in Interface IListViewCheckProvider and  IListViewPresentation but without good result.

I am looking for the checkbox drawing in the source but it's a little hard to track !

The more I check for selection the more I think there is a bug there but, "scalded cat fears cold water", I don't want to report to Bug Tracker (2 last one I report was said to be yet reported and one not reproducible)  without any proof/solution 
 

I also work on an interface

 IListViewSelectedItems = interface
   ['{3D8B9910-A017-4A10-8260-D44E9F7129B7}']
   procedure StartSelection;
   procedure SetSelected(Value : TList<Integer>);
   function  GetSelected :  TList<Integer>;
   property  Selected :  TList<Integer> read GetSelected write SetSelected;
 end;

   TListView = class(FMX.ListView.TListView,IListViewSelectedItems)
   private
     FSelected : TList<Integer>;
   public
     constructor Create(AOwner : TObject); // <<<<<<<<<<<<
     destructor Destroy; override;
     procedure StartSelection;
     procedure SetSelected(Value : TList<Integer>);
     function  GetSelected :  TList<Integer>;
     property  Selected :  TList<Integer> read GetSelected write SetSelected;
   end;

{ TListView override}        
procedure TListView.StartSelection;
begin
if not Assigned(FSelected) then FSelected:=TList<Integer>.Create;        
end;

function TListView.GetSelected : TList<Integer>;
begin
result := FSelected;       
end;       

procedure TlistView.SetSelected(value : TList<Integer>);
begin
FSelected:=Value;       
end;       

Here I can surely add an OnSelect event,(optionally a ClearSelection, SelectAll procedure).

But I am still blocked

   1 - a way to initialize FSelected at creation time (without using StartSelection)

   2 -on painting selection (overriding  or duplicating IListViewCheckProvider ?)    

Hi, sorry for delay but if it is still in actuality  here is how i make this

with  TBindGridLink.Create(Self) do
  begin
      ControlComponent := Grid1;
      SourceComponent := AdapterBindSource1;
      // Filling Grid
      ColumnExpressions.AddExpression; // adding a right filler
      with ColumnExpressions.AddExpression do // ColumnName = 'Code', ColumnIndex = 1
        begin
          SourceMemberName := 'Code';
          with FormatCellExpressions.AddExpression do
            begin
              ControlExpression := 'Data';
              SourceExpression := 'Value';
            end;
        end;
	  // an so on for columns 
	  
	  // MANDATORY TO NAVIGATE 
      // Position (synchronisation entre la liste et la grille)
      with PosControlExpressions.AddExpression do
        begin
          ControlExpression := 'Selected';
          SourceExpression := 'Math_Max(0,ItemIndex)';
        end;
      with PosSourceExpressions.AddExpression do
        begin
          ControlExpression := 'Math_Max(0,Selected)';
          SourceExpression := 'ItemIndex';
        end;
		
      // Working on columns size
      with FormatControlExpressions.AddExpression do
        begin
          ControlExpression := 'Columns[0].width';
          SourceExpression := '20';
        end;
      with FormatControlExpressions.AddExpression do
        begin
          ControlExpression := 'Columns[1].width';
          SourceExpression := '140';
        end;
      // and so on ...
  end;